libavformat/dashenc.c

   1 /*
   2  * MPEG-DASH ISO BMFF segmenter
   3  * Copyright (c) 2014 Martin Storsjo
   4  * Copyright (c) 2018 Akamai Technologies, Inc.
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "config.h"
  24 #if HAVE_UNISTD_H
  25 #include <unistd.h>
  26 #endif
  27
  28 #include "libavutil/avassert.h"
  29 #include "libavutil/avutil.h"
  30 #include "libavutil/avstring.h"
  31 #include "libavutil/intreadwrite.h"
  32 #include "libavutil/mathematics.h"
  33 #include "libavutil/opt.h"
  34 #include "libavutil/parseutils.h"
  35 #include "libavutil/rational.h"
  36 #include "libavutil/time.h"
  37 #include "libavutil/time_internal.h"
  38
  39 #include "av1.h"
  40 #include "avc.h"
  41 #include "avformat.h"
  42 #include "avio_internal.h"
  43 #include "hlsplaylist.h"
  44 #if CONFIG_HTTP_PROTOCOL
  45 #include "http.h"
  46 #endif
  47 #include "internal.h"
  48 #include "isom.h"
  49 #include "os_support.h"
  50 #include "url.h"
  51 #include "vpcc.h"
  52 #include "dash.h"
  53
  54 typedef enum {
  55     SEGMENT_TYPE_AUTO = 0,
  56     SEGMENT_TYPE_MP4,
  57     SEGMENT_TYPE_WEBM,
  58     SEGMENT_TYPE_NB
  59 } SegmentType;
  60
  61 enum {
  62     FRAG_TYPE_NONE = 0,
  63     FRAG_TYPE_EVERY_FRAME,
  64     FRAG_TYPE_DURATION,
  65     FRAG_TYPE_PFRAMES,
  66     FRAG_TYPE_NB
  67 };
  68
  69 #define MPD_PROFILE_DASH 1
  70 #define MPD_PROFILE_DVB  2
  71
  72 typedef struct Segment {
  73     char file[1024];
  74     int64_t start_pos;
  75     int range_length, index_length;
  76     int64_t time;
  77     double prog_date_time;
  78     int64_t duration;
  79     int n;
  80 } Segment;
  81
  82 typedef struct AdaptationSet {
  83     int id;
  84     char *descriptor;
  85     int64_t seg_duration;
  86     int64_t frag_duration;
  87     int frag_type;
  88     enum AVMediaType media_type;
  89     AVDictionary *metadata;
  90     AVRational min_frame_rate, max_frame_rate;
  91     int ambiguous_frame_rate;
  92     int64_t max_frag_duration;
  93     int max_width, max_height;
  94     int nb_streams;
  95     AVRational par;
  96     int trick_idx;
  97 } AdaptationSet;
  98
  99 typedef struct OutputStream {
 100     AVFormatContext *ctx;
 101     int ctx_inited, as_idx;
 102     AVIOContext *out;
 103     AVCodecParserContext *parser;
 104     AVCodecContext *parser_avctx;
 105     int packets_written;
 106     char initfile[1024];
 107     int64_t init_start_pos, pos;
 108     int init_range_length;
 109     int nb_segments, segments_size, segment_index;
 110     int64_t seg_duration;
 111     int64_t frag_duration;
 112     int64_t last_duration;
 113     Segment **segments;
 114     int64_t first_pts, start_pts, max_pts;
 115     int64_t last_dts, last_pts;
 116     int last_flags;
 117     int bit_rate;
 118     SegmentType segment_type;  /* segment type selected for this particular stream */
 119     const char *format_name;
 120     const char *extension_name;
 121     const char *single_file_name;  /* file names selected for this particular stream */
 122     const char *init_seg_name;
 123     const char *media_seg_name;
 124
 125     char codec_str[100];
 126     int written_len;
 127     char filename[1024];
 128     char full_path[1024];
 129     char temp_path[1024];
 130     double availability_time_offset;
 131     AVProducerReferenceTime producer_reference_time;
 132     char producer_reference_time_str[100];
 133     int total_pkt_size;
 134     int64_t total_pkt_duration;
 135     int muxer_overhead;
 136     int frag_type;
 137     int64_t gop_size;
 138     AVRational sar;
 139     int coding_dependency;
 140 } OutputStream;
 141
 142 typedef struct DASHContext {
 143     const AVClass *class;  /* Class for private options. */
 144     char *adaptation_sets;
 145     AdaptationSet *as;
 146     int nb_as;
 147     int window_size;
 148     int extra_window_size;
 149 #if FF_API_DASH_MIN_SEG_DURATION
 150     int min_seg_duration;
 151 #endif
 152     int64_t seg_duration;
 153     int64_t frag_duration;
 154     int remove_at_exit;
 155     int use_template;
 156     int use_timeline;
 157     int single_file;
 158     OutputStream *streams;
 159     int has_video;
 160     int64_t last_duration;
 161     int64_t total_duration;
 162     char availability_start_time[100];
 163     time_t start_time_s;
 164     int64_t presentation_time_offset;
 165     char dirname[1024];
 166     const char *single_file_name;  /* file names as specified in options */
 167     const char *init_seg_name;
 168     const char *media_seg_name;
 169     const char *utc_timing_url;
 170     const char *method;
 171     const char *user_agent;
 172     AVDictionary *http_opts;
 173     int hls_playlist;
 174     int http_persistent;
 175     int master_playlist_created;
 176     AVIOContext *mpd_out;
 177     AVIOContext *m3u8_out;
 178     int streaming;
 179     int64_t timeout;
 180     int index_correction;
 181     AVDictionary *format_options;
 182     int global_sidx;
 183     SegmentType segment_type_option;  /* segment type as specified in options */
 184     int ignore_io_errors;
 185     int lhls;
 186     int ldash;
 187     int master_publish_rate;
 188     int nr_of_streams_to_flush;
 189     int nr_of_streams_flushed;
 190     int frag_type;
 191     int write_prft;
 192     int64_t max_gop_size;
 193     int64_t max_segment_duration;
 194     int profile;
 195     int64_t target_latency;
 196     int target_latency_refid;
 197     AVRational min_playback_rate;
 198     AVRational max_playback_rate;
 199 } DASHContext;
 200
 201 static struct codec_string {
 202     int id;
 203     const char *str;
 204 } codecs[] = {
 205     { AV_CODEC_ID_VP8, "vp8" },
 206     { AV_CODEC_ID_VP9, "vp9" },
 207     { AV_CODEC_ID_VORBIS, "vorbis" },
 208     { AV_CODEC_ID_OPUS, "opus" },
 209     { AV_CODEC_ID_FLAC, "flac" },
 210     { 0, NULL }
 211 };
 212
 213 static struct format_string {
 214     SegmentType segment_type;
 215     const char *str;
 216 } formats[] = {
 217     { SEGMENT_TYPE_AUTO, "auto" },
 218     { SEGMENT_TYPE_MP4, "mp4" },
 219     { SEGMENT_TYPE_WEBM, "webm" },
 220     { 0, NULL }
 221 };
 222
 223 static int dashenc_io_open(AVFormatContext *s, AVIOContext **pb, char *filename,
 224                            AVDictionary **options) {
 225     DASHContext *c = s->priv_data;
 226     int http_base_proto = filename ? ff_is_http_proto(filename) : 0;
 227     int err = AVERROR_MUXER_NOT_FOUND;
 228     if (!*pb || !http_base_proto || !c->http_persistent) {
 229         err = s->io_open(s, pb, filename, AVIO_FLAG_WRITE, options);
 230 #if CONFIG_HTTP_PROTOCOL
 231     } else {
 232         URLContext *http_url_context = ffio_geturlcontext(*pb);
 233         av_assert0(http_url_context);
 234         err = ff_http_do_new_request(http_url_context, filename);
 235         if (err < 0)
 236             ff_format_io_close(s, pb);
 237 #endif
 238     }
 239     return err;
 240 }
 241
 242 static void dashenc_io_close(AVFormatContext *s, AVIOContext **pb, char *filename) {
 243     DASHContext *c = s->priv_data;
 244     int http_base_proto = filename ? ff_is_http_proto(filename) : 0;
 245
 246     if (!*pb)
 247         return;
 248
 249     if (!http_base_proto || !c->http_persistent) {
 250         ff_format_io_close(s, pb);
 251 #if CONFIG_HTTP_PROTOCOL
 252     } else {
 253         URLContext *http_url_context = ffio_geturlcontext(*pb);
 254         av_assert0(http_url_context);
 255         avio_flush(*pb);
 256         ffurl_shutdown(http_url_context, AVIO_FLAG_WRITE);
 257 #endif
 258     }
 259 }
 260
 261 static const char *get_format_str(SegmentType segment_type) {
 262     int i;
 263     for (i = 0; i < SEGMENT_TYPE_NB; i++)
 264         if (formats[i].segment_type == segment_type)
 265             return formats[i].str;
 266     return NULL;
 267 }
 268
 269 static const char *get_extension_str(SegmentType type, int single_file)
 270 {
 271     switch (type) {
 272
 273     case SEGMENT_TYPE_MP4:  return single_file ? "mp4" : "m4s";
 274     case SEGMENT_TYPE_WEBM: return "webm";
 275     default: return NULL;
 276     }
 277 }
 278
 279 static int handle_io_open_error(AVFormatContext *s, int err, char *url) {
 280     DASHContext *c = s->priv_data;
 281     char errbuf[AV_ERROR_MAX_STRING_SIZE];
 282     av_strerror(err, errbuf, sizeof(errbuf));
 283     av_log(s, c->ignore_io_errors ? AV_LOG_WARNING : AV_LOG_ERROR,
 284            "Unable to open %s for writing: %s\n", url, errbuf);
 285     return c->ignore_io_errors ? 0 : err;
 286 }
 287
 288 static inline SegmentType select_segment_type(SegmentType segment_type, enum AVCodecID codec_id)
 289 {
 290     if (segment_type == SEGMENT_TYPE_AUTO) {
 291         if (codec_id == AV_CODEC_ID_OPUS || codec_id == AV_CODEC_ID_VORBIS ||
 292             codec_id == AV_CODEC_ID_VP8 || codec_id == AV_CODEC_ID_VP9) {
 293             segment_type = SEGMENT_TYPE_WEBM;
 294         } else {
 295             segment_type = SEGMENT_TYPE_MP4;
 296         }
 297     }
 298
 299     return segment_type;
 300 }
 301
 302 static int init_segment_types(AVFormatContext *s)
 303 {
 304     DASHContext *c = s->priv_data;
 305     int has_mp4_streams = 0;
 306     for (int i = 0; i < s->nb_streams; ++i) {
 307         OutputStream *os = &c->streams[i];
 308         SegmentType segment_type = select_segment_type(
 309             c->segment_type_option, s->streams[i]->codecpar->codec_id);
 310         os->segment_type = segment_type;
 311         os->format_name = get_format_str(segment_type);
 312         if (!os->format_name) {
 313             av_log(s, AV_LOG_ERROR, "Could not select DASH segment type for stream %d\n", i);
 314             return AVERROR_MUXER_NOT_FOUND;
 315         }
 316         os->extension_name = get_extension_str(segment_type, c->single_file);
 317         if (!os->extension_name) {
 318             av_log(s, AV_LOG_ERROR, "Could not get extension type for stream %d\n", i);
 319             return AVERROR_MUXER_NOT_FOUND;
 320         }
 321
 322         has_mp4_streams |= segment_type == SEGMENT_TYPE_MP4;
 323     }
 324
 325     if (c->hls_playlist && !has_mp4_streams) {
 326          av_log(s, AV_LOG_WARNING, "No mp4 streams, disabling HLS manifest generation\n");
 327          c->hls_playlist = 0;
 328     }
 329
 330     return 0;
 331 }
 332
 333 static int check_file_extension(const char *filename, const char *extension) {
 334     char *dot;
 335     if (!filename || !extension)
 336         return -1;
 337     dot = strrchr(filename, '.');
 338     if (dot && !strcmp(dot + 1, extension))
 339         return 0;
 340     return -1;
 341 }
 342
 343 static void set_vp9_codec_str(AVFormatContext *s, AVCodecParameters *par,
 344                               AVRational *frame_rate, char *str, int size) {
 345     VPCC vpcc;
 346     int ret = ff_isom_get_vpcc_features(s, par, frame_rate, &vpcc);
 347     if (ret == 0) {
 348         av_strlcatf(str, size, "vp09.%02d.%02d.%02d",
 349                     vpcc.profile, vpcc.level, vpcc.bitdepth);
 350     } else {
 351         // Default to just vp9 in case of error while finding out profile or level
 352         av_log(s, AV_LOG_WARNING, "Could not find VP9 profile and/or level\n");
 353         av_strlcpy(str, "vp9", size);
 354     }
 355     return;
 356 }
 357
 358 static void set_codec_str(AVFormatContext *s, AVCodecParameters *par,
 359                           AVRational *frame_rate, char *str, int size)
 360 {
 361     const AVCodecTag *tags[2] = { NULL, NULL };
 362     uint32_t tag;
 363     int i;
 364
 365     // common Webm codecs are not part of RFC 6381
 366     for (i = 0; codecs[i].id; i++)
 367         if (codecs[i].id == par->codec_id) {
 368             if (codecs[i].id == AV_CODEC_ID_VP9) {
 369                 set_vp9_codec_str(s, par, frame_rate, str, size);
 370             } else {
 371                 av_strlcpy(str, codecs[i].str, size);
 372             }
 373             return;
 374         }
 375
 376     // for codecs part of RFC 6381
 377     if (par->codec_type == AVMEDIA_TYPE_VIDEO)
 378         tags[0] = ff_codec_movvideo_tags;
 379     else if (par->codec_type == AVMEDIA_TYPE_AUDIO)
 380         tags[0] = ff_codec_movaudio_tags;
 381     else
 382         return;
 383
 384     tag = par->codec_tag;
 385     if (!tag)
 386         tag = av_codec_get_tag(tags, par->codec_id);
 387     if (!tag)
 388         return;
 389     if (size < 5)
 390         return;
 391
 392     AV_WL32(str, tag);
 393     str[4] = '\0';
 394     if (!strcmp(str, "mp4a") || !strcmp(str, "mp4v")) {
 395         uint32_t oti;
 396         tags[0] = ff_mp4_obj_type;
 397         oti = av_codec_get_tag(tags, par->codec_id);
 398         if (oti)
 399             av_strlcatf(str, size, ".%02"PRIx32, oti);
 400         else
 401             return;
 402
 403         if (tag == MKTAG('m', 'p', '4', 'a')) {
 404             if (par->extradata_size >= 2) {
 405                 int aot = par->extradata[0] >> 3;
 406                 if (aot == 31)
 407                     aot = ((AV_RB16(par->extradata) >> 5) & 0x3f) + 32;
 408                 av_strlcatf(str, size, ".%d", aot);
 409             }
 410         } else if (tag == MKTAG('m', 'p', '4', 'v')) {
 411             // Unimplemented, should output ProfileLevelIndication as a decimal number
 412             av_log(s, AV_LOG_WARNING, "Incomplete RFC 6381 codec string for mp4v\n");
 413         }
 414     } else if (!strcmp(str, "avc1")) {
 415         uint8_t *tmpbuf = NULL;
 416         uint8_t *extradata = par->extradata;
 417         int extradata_size = par->extradata_size;
 418         if (!extradata_size)
 419             return;
 420         if (extradata[0] != 1) {
 421             AVIOContext *pb;
 422             if (avio_open_dyn_buf(&pb) < 0)
 423                 return;
 424             if (ff_isom_write_avcc(pb, extradata, extradata_size) < 0) {
 425                 ffio_free_dyn_buf(&pb);
 426                 return;
 427             }
 428             extradata_size = avio_close_dyn_buf(pb, &extradata);
 429             tmpbuf = extradata;
 430         }
 431
 432         if (extradata_size >= 4)
 433             av_strlcatf(str, size, ".%02x%02x%02x",
 434                         extradata[1], extradata[2], extradata[3]);
 435         av_free(tmpbuf);
 436     } else if (!strcmp(str, "av01")) {
 437         AV1SequenceParameters seq;
 438         if (!par->extradata_size)
 439             return;
 440         if (ff_av1_parse_seq_header(&seq, par->extradata, par->extradata_size) < 0)
 441             return;
 442
 443         av_strlcatf(str, size, ".%01u.%02u%s.%02u",
 444                     seq.profile, seq.level, seq.tier ? "H" : "M", seq.bitdepth);
 445         if (seq.color_description_present_flag)
 446             av_strlcatf(str, size, ".%01u.%01u%01u%01u.%02u.%02u.%02u.%01u",
 447                         seq.monochrome,
 448                         seq.chroma_subsampling_x, seq.chroma_subsampling_y, seq.chroma_sample_position,
 449                         seq.color_primaries, seq.transfer_characteristics, seq.matrix_coefficients,
 450                         seq.color_range);
 451     }
 452 }
 453
 454 static int flush_dynbuf(DASHContext *c, OutputStream *os, int *range_length)
 455 {
 456     uint8_t *buffer;
 457
 458     if (!os->ctx->pb) {
 459         return AVERROR(EINVAL);
 460     }
 461
 462     // flush
 463     av_write_frame(os->ctx, NULL);
 464     avio_flush(os->ctx->pb);
 465
 466     if (!c->single_file) {
 467         // write out to file
 468         *range_length = avio_close_dyn_buf(os->ctx->pb, &buffer);
 469         os->ctx->pb = NULL;
 470         if (os->out)
 471             avio_write(os->out, buffer + os->written_len, *range_length - os->written_len);
 472         os->written_len = 0;
 473         av_free(buffer);
 474
 475         // re-open buffer
 476         return avio_open_dyn_buf(&os->ctx->pb);
 477     } else {
 478         *range_length = avio_tell(os->ctx->pb) - os->pos;
 479         return 0;
 480     }
 481 }
 482
 483 static void set_http_options(AVDictionary **options, DASHContext *c)
 484 {
 485     if (c->method)
 486         av_dict_set(options, "method", c->method, 0);
 487     av_dict_copy(options, c->http_opts, 0);
 488     if (c->user_agent)
 489         av_dict_set(options, "user_agent", c->user_agent, 0);
 490     if (c->http_persistent)
 491         av_dict_set_int(options, "multiple_requests", 1, 0);
 492     if (c->timeout >= 0)
 493         av_dict_set_int(options, "timeout", c->timeout, 0);
 494 }
 495
 496 static void get_hls_playlist_name(char *playlist_name, int string_size,
 497                                   const char *base_url, int id) {
 498     if (base_url)
 499         snprintf(playlist_name, string_size, "%smedia_%d.m3u8", base_url, id);
 500     else
 501         snprintf(playlist_name, string_size, "media_%d.m3u8", id);
 502 }
 503
 504 static void get_start_index_number(OutputStream *os, DASHContext *c,
 505                                    int *start_index, int *start_number) {
 506     *start_index = 0;
 507     *start_number = 1;
 508     if (c->window_size) {
 509         *start_index  = FFMAX(os->nb_segments   - c->window_size, 0);
 510         *start_number = FFMAX(os->segment_index - c->window_size, 1);
 511     }
 512 }
 513
 514 static void write_hls_media_playlist(OutputStream *os, AVFormatContext *s,
 515                                      int representation_id, int final,
 516                                      char *prefetch_url) {
 517     DASHContext *c = s->priv_data;
 518     int timescale = os->ctx->streams[0]->time_base.den;
 519     char temp_filename_hls[1024];
 520     char filename_hls[1024];
 521     AVDictionary *http_opts = NULL;
 522     int target_duration = 0;
 523     int ret = 0;
 524     const char *proto = avio_find_protocol_name(c->dirname);
 525     int use_rename = proto && !strcmp(proto, "file");
 526     int i, start_index, start_number;
 527     double prog_date_time = 0;
 528
 529     get_start_index_number(os, c, &start_index, &start_number);
 530
 531     if (!c->hls_playlist || start_index >= os->nb_segments ||
 532         os->segment_type != SEGMENT_TYPE_MP4)
 533         return;
 534
 535     get_hls_playlist_name(filename_hls, sizeof(filename_hls),
 536                           c->dirname, representation_id);
 537
 538     snprintf(temp_filename_hls, sizeof(temp_filename_hls), use_rename ? "%s.tmp" : "%s", filename_hls);
 539
 540     set_http_options(&http_opts, c);
 541     ret = dashenc_io_open(s, &c->m3u8_out, temp_filename_hls, &http_opts);
 542     av_dict_free(&http_opts);
 543     if (ret < 0) {
 544         handle_io_open_error(s, ret, temp_filename_hls);
 545         return;
 546     }
 547     for (i = start_index; i < os->nb_segments; i++) {
 548         Segment *seg = os->segments[i];
 549         double duration = (double) seg->duration / timescale;
 550         if (target_duration <= duration)
 551             target_duration = lrint(duration);
 552     }
 553
 554     ff_hls_write_playlist_header(c->m3u8_out, 6, -1, target_duration,
 555                                  start_number, PLAYLIST_TYPE_NONE, 0);
 556
 557     ff_hls_write_init_file(c->m3u8_out, os->initfile, c->single_file,
 558                            os->init_range_length, os->init_start_pos);
 559
 560     for (i = start_index; i < os->nb_segments; i++) {
 561         Segment *seg = os->segments[i];
 562
 563         if (prog_date_time == 0) {
 564             if (os->nb_segments == 1)
 565                 prog_date_time = c->start_time_s;
 566             else
 567                 prog_date_time = seg->prog_date_time;
 568         }
 569         seg->prog_date_time = prog_date_time;
 570
 571         ret = ff_hls_write_file_entry(c->m3u8_out, 0, c->single_file,
 572                                 (double) seg->duration / timescale, 0,
 573                                 seg->range_length, seg->start_pos, NULL,
 574                                 c->single_file ? os->initfile : seg->file,
 575                                 &prog_date_time, 0, 0, 0);
 576         if (ret < 0) {
 577             av_log(os->ctx, AV_LOG_WARNING, "ff_hls_write_file_entry get error\n");
 578         }
 579     }
 580
 581     if (prefetch_url)
 582         avio_printf(c->m3u8_out, "#EXT-X-PREFETCH:%s\n", prefetch_url);
 583
 584     if (final)
 585         ff_hls_write_end_list(c->m3u8_out);
 586
 587     dashenc_io_close(s, &c->m3u8_out, temp_filename_hls);
 588
 589     if (use_rename)
 590         ff_rename(temp_filename_hls, filename_hls, os->ctx);
 591 }
 592
 593 static int flush_init_segment(AVFormatContext *s, OutputStream *os)
 594 {
 595     DASHContext *c = s->priv_data;
 596     int ret, range_length;
 597
 598     ret = flush_dynbuf(c, os, &range_length);
 599     if (ret < 0)
 600         return ret;
 601
 602     os->pos = os->init_range_length = range_length;
 603     if (!c->single_file) {
 604         char filename[1024];
 605         snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
 606         dashenc_io_close(s, &os->out, filename);
 607     }
 608     return 0;
 609 }
 610
 611 static void dash_free(AVFormatContext *s)
 612 {
 613     DASHContext *c = s->priv_data;
 614     int i, j;
 615
 616     if (c->as) {
 617         for (i = 0; i < c->nb_as; i++) {
 618             av_dict_free(&c->as[i].metadata);
 619             av_freep(&c->as[i].descriptor);
 620         }
 621         av_freep(&c->as);
 622         c->nb_as = 0;
 623     }
 624
 625     if (!c->streams)
 626         return;
 627     for (i = 0; i < s->nb_streams; i++) {
 628         OutputStream *os = &c->streams[i];
 629         if (os->ctx && os->ctx->pb) {
 630             if (!c->single_file)
 631                 ffio_free_dyn_buf(&os->ctx->pb);
 632             else
 633                 avio_close(os->ctx->pb);
 634         }
 635         ff_format_io_close(s, &os->out);
 636         avformat_free_context(os->ctx);
 637         avcodec_free_context(&os->parser_avctx);
 638         av_parser_close(os->parser);
 639         for (j = 0; j < os->nb_segments; j++)
 640             av_free(os->segments[j]);
 641         av_free(os->segments);
 642         av_freep(&os->single_file_name);
 643         av_freep(&os->init_seg_name);
 644         av_freep(&os->media_seg_name);
 645     }
 646     av_freep(&c->streams);
 647
 648     ff_format_io_close(s, &c->mpd_out);
 649     ff_format_io_close(s, &c->m3u8_out);
 650 }
 651
 652 static void output_segment_list(OutputStream *os, AVIOContext *out, AVFormatContext *s,
 653                                 int representation_id, int final)
 654 {
 655     DASHContext *c = s->priv_data;
 656     int i, start_index, start_number;
 657     get_start_index_number(os, c, &start_index, &start_number);
 658
 659     if (c->use_template) {
 660         int timescale = c->use_timeline ? os->ctx->streams[0]->time_base.den : AV_TIME_BASE;
 661         avio_printf(out, "\t\t\t\t<SegmentTemplate timescale=\"%d\" ", timescale);
 662         if (!c->use_timeline) {
 663             avio_printf(out, "duration=\"%"PRId64"\" ", os->seg_duration);
 664             if (c->streaming && os->availability_time_offset)
 665                 avio_printf(out, "availabilityTimeOffset=\"%.3f\" ",
 666                             os->availability_time_offset);
 667         }
 668         if (c->streaming && os->availability_time_offset && !final)
 669             avio_printf(out, "availabilityTimeComplete=\"false\" ");
 670
 671         avio_printf(out, "initialization=\"%s\" media=\"%s\" startNumber=\"%d\"", os->init_seg_name, os->media_seg_name, c->use_timeline ? start_number : 1);
 672         if (c->presentation_time_offset)
 673             avio_printf(out, " presentationTimeOffset=\"%"PRId64"\"", c->presentation_time_offset);
 674         avio_printf(out, ">\n");
 675         if (c->use_timeline) {
 676             int64_t cur_time = 0;
 677             avio_printf(out, "\t\t\t\t\t<SegmentTimeline>\n");
 678             for (i = start_index; i < os->nb_segments; ) {
 679                 Segment *seg = os->segments[i];
 680                 int repeat = 0;
 681                 avio_printf(out, "\t\t\t\t\t\t<S ");
 682                 if (i == start_index || seg->time != cur_time) {
 683                     cur_time = seg->time;
 684                     avio_printf(out, "t=\"%"PRId64"\" ", seg->time);
 685                 }
 686                 avio_printf(out, "d=\"%"PRId64"\" ", seg->duration);
 687                 while (i + repeat + 1 < os->nb_segments &&
 688                        os->segments[i + repeat + 1]->duration == seg->duration &&
 689                        os->segments[i + repeat + 1]->time == os->segments[i + repeat]->time + os->segments[i + repeat]->duration)
 690                     repeat++;
 691                 if (repeat > 0)
 692                     avio_printf(out, "r=\"%d\" ", repeat);
 693                 avio_printf(out, "/>\n");
 694                 i += 1 + repeat;
 695                 cur_time += (1 + repeat) * seg->duration;
 696             }
 697             avio_printf(out, "\t\t\t\t\t</SegmentTimeline>\n");
 698         }
 699         avio_printf(out, "\t\t\t\t</SegmentTemplate>\n");
 700     } else if (c->single_file) {
 701         avio_printf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", os->initfile);
 702         avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, FFMIN(os->seg_duration, os->last_duration), start_number);
 703         avio_printf(out, "\t\t\t\t\t<Initialization range=\"%"PRId64"-%"PRId64"\" />\n", os->init_start_pos, os->init_start_pos + os->init_range_length - 1);
 704         for (i = start_index; i < os->nb_segments; i++) {
 705             Segment *seg = os->segments[i];
 706             avio_printf(out, "\t\t\t\t\t<SegmentURL mediaRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->range_length - 1);
 707             if (seg->index_length)
 708                 avio_printf(out, "indexRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->index_length - 1);
 709             avio_printf(out, "/>\n");
 710         }
 711         avio_printf(out, "\t\t\t\t</SegmentList>\n");
 712     } else {
 713         avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, FFMIN(os->seg_duration, os->last_duration), start_number);
 714         avio_printf(out, "\t\t\t\t\t<Initialization sourceURL=\"%s\" />\n", os->initfile);
 715         for (i = start_index; i < os->nb_segments; i++) {
 716             Segment *seg = os->segments[i];
 717             avio_printf(out, "\t\t\t\t\t<SegmentURL media=\"%s\" />\n", seg->file);
 718         }
 719         avio_printf(out, "\t\t\t\t</SegmentList>\n");
 720     }
 721     if (!c->lhls || final) {
 722         write_hls_media_playlist(os, s, representation_id, final, NULL);
 723     }
 724
 725 }
 726
 727 static char *xmlescape(const char *str) {
 728     int outlen = strlen(str)*3/2 + 6;
 729     char *out = av_realloc(NULL, outlen + 1);
 730     int pos = 0;
 731     if (!out)
 732         return NULL;
 733     for (; *str; str++) {
 734         if (pos + 6 > outlen) {
 735             char *tmp;
 736             outlen = 2 * outlen + 6;
 737             tmp = av_realloc(out, outlen + 1);
 738             if (!tmp) {
 739                 av_free(out);
 740                 return NULL;
 741             }
 742             out = tmp;
 743         }
 744         if (*str == '&') {
 745             memcpy(&out[pos], "&amp;", 5);
 746             pos += 5;
 747         } else if (*str == '<') {
 748             memcpy(&out[pos], "&lt;", 4);
 749             pos += 4;
 750         } else if (*str == '>') {
 751             memcpy(&out[pos], "&gt;", 4);
 752             pos += 4;
 753         } else if (*str == '\'') {
 754             memcpy(&out[pos], "&apos;", 6);
 755             pos += 6;
 756         } else if (*str == '\"') {
 757             memcpy(&out[pos], "&quot;", 6);
 758             pos += 6;
 759         } else {
 760             out[pos++] = *str;
 761         }
 762     }
 763     out[pos] = '\0';
 764     return out;
 765 }
 766
 767 static void write_time(AVIOContext *out, int64_t time)
 768 {
 769     int seconds = time / AV_TIME_BASE;
 770     int fractions = time % AV_TIME_BASE;
 771     int minutes = seconds / 60;
 772     int hours = minutes / 60;
 773     seconds %= 60;
 774     minutes %= 60;
 775     avio_printf(out, "PT");
 776     if (hours)
 777         avio_printf(out, "%dH", hours);
 778     if (hours || minutes)
 779         avio_printf(out, "%dM", minutes);
 780     avio_printf(out, "%d.%dS", seconds, fractions / (AV_TIME_BASE / 10));
 781 }
 782
 783 static void format_date(char *buf, int size, int64_t time_us)
 784 {
 785     struct tm *ptm, tmbuf;
 786     int64_t time_ms = time_us / 1000;
 787     const time_t time_s = time_ms / 1000;
 788     int millisec = time_ms - (time_s * 1000);
 789     ptm = gmtime_r(&time_s, &tmbuf);
 790     if (ptm) {
 791         int len;
 792         if (!strftime(buf, size, "%Y-%m-%dT%H:%M:%S", ptm)) {
 793             buf[0] = '\0';
 794             return;
 795         }
 796         len = strlen(buf);
 797         snprintf(buf + len, size - len, ".%03dZ", millisec);
 798     }
 799 }
 800
 801 static int write_adaptation_set(AVFormatContext *s, AVIOContext *out, int as_index,
 802                                 int final)
 803 {
 804     DASHContext *c = s->priv_data;
 805     AdaptationSet *as = &c->as[as_index];
 806     AVDictionaryEntry *lang, *role;
 807     int i;
 808
 809     avio_printf(out, "\t\t<AdaptationSet id=\"%d\" contentType=\"%s\" startWithSAP=\"1\" segmentAlignment=\"true\" bitstreamSwitching=\"true\"",
 810                 as->id, as->media_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
 811     if (as->media_type == AVMEDIA_TYPE_VIDEO && as->max_frame_rate.num && !as->ambiguous_frame_rate && av_cmp_q(as->min_frame_rate, as->max_frame_rate) < 0)
 812         avio_printf(out, " maxFrameRate=\"%d/%d\"", as->max_frame_rate.num, as->max_frame_rate.den);
 813     else if (as->media_type == AVMEDIA_TYPE_VIDEO && as->max_frame_rate.num && !as->ambiguous_frame_rate && !av_cmp_q(as->min_frame_rate, as->max_frame_rate))
 814         avio_printf(out, " frameRate=\"%d/%d\"", as->max_frame_rate.num, as->max_frame_rate.den);
 815     if (as->media_type == AVMEDIA_TYPE_VIDEO) {
 816         avio_printf(out, " maxWidth=\"%d\" maxHeight=\"%d\"", as->max_width, as->max_height);
 817         avio_printf(out, " par=\"%d:%d\"", as->par.num, as->par.den);
 818     }
 819     lang = av_dict_get(as->metadata, "language", NULL, 0);
 820     if (lang)
 821         avio_printf(out, " lang=\"%s\"", lang->value);
 822     avio_printf(out, ">\n");
 823
 824     if (!final && c->ldash && as->max_frag_duration && !(c->profile & MPD_PROFILE_DVB))
 825         avio_printf(out, "\t\t\t<Resync dT=\"%"PRId64"\" type=\"0\"/>\n", as->max_frag_duration);
 826     if (as->trick_idx >= 0)
 827         avio_printf(out, "\t\t\t<EssentialProperty id=\"%d\" schemeIdUri=\"http://dashif.org/guidelines/trickmode\" value=\"%d\"/>\n", as->id, as->trick_idx);
 828     role = av_dict_get(as->metadata, "role", NULL, 0);
 829     if (role)
 830         avio_printf(out, "\t\t\t<Role schemeIdUri=\"urn:mpeg:dash:role:2011\" value=\"%s\"/>\n", role->value);
 831     if (as->descriptor)
 832         avio_printf(out, "\t\t\t%s\n", as->descriptor);
 833     for (i = 0; i < s->nb_streams; i++) {
 834         AVStream *st = s->streams[i];
 835         OutputStream *os = &c->streams[i];
 836         char bandwidth_str[64] = {'\0'};
 837
 838         if (os->as_idx - 1 != as_index)
 839             continue;
 840
 841         if (os->bit_rate > 0)
 842             snprintf(bandwidth_str, sizeof(bandwidth_str), " bandwidth=\"%d\"",
 843                      os->bit_rate);
 844
 845         if (as->media_type == AVMEDIA_TYPE_VIDEO) {
 846             avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"video/%s\" codecs=\"%s\"%s width=\"%d\" height=\"%d\"",
 847                 i, os->format_name, os->codec_str, bandwidth_str, s->streams[i]->codecpar->width, s->streams[i]->codecpar->height);
 848             if (st->codecpar->field_order == AV_FIELD_UNKNOWN)
 849                 avio_printf(out, " scanType=\"unknown\"");
 850             else if (st->codecpar->field_order != AV_FIELD_PROGRESSIVE)
 851                 avio_printf(out, " scanType=\"interlaced\"");
 852             avio_printf(out, " sar=\"%d:%d\"", os->sar.num, os->sar.den);
 853             if (st->avg_frame_rate.num && av_cmp_q(as->min_frame_rate, as->max_frame_rate) < 0)
 854                 avio_printf(out, " frameRate=\"%d/%d\"", st->avg_frame_rate.num, st->avg_frame_rate.den);
 855             if (as->trick_idx >= 0) {
 856                 AdaptationSet *tas = &c->as[as->trick_idx];
 857                 if (!as->ambiguous_frame_rate && !tas->ambiguous_frame_rate)
 858                     avio_printf(out, " maxPlayoutRate=\"%d\"", FFMAX((int)av_q2d(av_div_q(tas->min_frame_rate, as->min_frame_rate)), 1));
 859             }
 860             if (!os->coding_dependency)
 861                 avio_printf(out, " codingDependency=\"false\"");
 862             avio_printf(out, ">\n");
 863         } else {
 864             avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"audio/%s\" codecs=\"%s\"%s audioSamplingRate=\"%d\">\n",
 865                 i, os->format_name, os->codec_str, bandwidth_str, s->streams[i]->codecpar->sample_rate);
 866             avio_printf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n",
 867                 s->streams[i]->codecpar->channels);
 868         }
 869         if (!final && c->write_prft && os->producer_reference_time_str[0]) {
 870             avio_printf(out, "\t\t\t\t<ProducerReferenceTime id=\"%d\" inband=\"true\" type=\"%s\" wallClockTime=\"%s\" presentationTime=\"%"PRId64"\">\n",
 871                         i, os->producer_reference_time.flags ? "captured" : "encoder", os->producer_reference_time_str, c->presentation_time_offset);
 872             avio_printf(out, "\t\t\t\t\t<UTCTiming schemeIdUri=\"urn:mpeg:dash:utc:http-xsdate:2014\" value=\"%s\"/>\n", c->utc_timing_url);
 873             avio_printf(out, "\t\t\t\t</ProducerReferenceTime>\n");
 874         }
 875         if (!final && c->ldash && os->gop_size && os->frag_type != FRAG_TYPE_NONE && !(c->profile & MPD_PROFILE_DVB) &&
 876             (os->frag_type != FRAG_TYPE_DURATION || os->frag_duration != os->seg_duration))
 877             avio_printf(out, "\t\t\t\t<Resync dT=\"%"PRId64"\" type=\"1\"/>\n", os->gop_size);
 878         output_segment_list(os, out, s, i, final);
 879         avio_printf(out, "\t\t\t</Representation>\n");
 880     }
 881     avio_printf(out, "\t\t</AdaptationSet>\n");
 882
 883     return 0;
 884 }
 885
 886 static int add_adaptation_set(AVFormatContext *s, AdaptationSet **as, enum AVMediaType type)
 887 {
 888     DASHContext *c = s->priv_data;
 889     void *mem;
 890
 891     if (c->profile & MPD_PROFILE_DVB && (c->nb_as + 1) > 16) {
 892         av_log(s, AV_LOG_ERROR, "DVB-DASH profile allows a max of 16 Adaptation Sets\n");
 893         return AVERROR(EINVAL);
 894     }
 895     mem = av_realloc(c->as, sizeof(*c->as) * (c->nb_as + 1));
 896     if (!mem)
 897         return AVERROR(ENOMEM);
 898     c->as = mem;
 899     ++c->nb_as;
 900
 901     *as = &c->as[c->nb_as - 1];
 902     memset(*as, 0, sizeof(**as));
 903     (*as)->media_type = type;
 904     (*as)->frag_type = -1;
 905     (*as)->trick_idx = -1;
 906
 907     return 0;
 908 }
 909
 910 static int adaptation_set_add_stream(AVFormatContext *s, int as_idx, int i)
 911 {
 912     DASHContext *c = s->priv_data;
 913     AdaptationSet *as = &c->as[as_idx - 1];
 914     OutputStream *os = &c->streams[i];
 915
 916     if (as->media_type != s->streams[i]->codecpar->codec_type) {
 917         av_log(s, AV_LOG_ERROR, "Codec type of stream %d doesn't match AdaptationSet's media type\n", i);
 918         return AVERROR(EINVAL);
 919     } else if (os->as_idx) {
 920         av_log(s, AV_LOG_ERROR, "Stream %d is already assigned to an AdaptationSet\n", i);
 921         return AVERROR(EINVAL);
 922     }
 923     if (c->profile & MPD_PROFILE_DVB && (as->nb_streams + 1) > 16) {
 924         av_log(s, AV_LOG_ERROR, "DVB-DASH profile allows a max of 16 Representations per Adaptation Set\n");
 925         return AVERROR(EINVAL);
 926     }
 927     os->as_idx = as_idx;
 928     ++as->nb_streams;
 929
 930     return 0;
 931 }
 932
 933 static int parse_adaptation_sets(AVFormatContext *s)
 934 {
 935     DASHContext *c = s->priv_data;
 936     const char *p = c->adaptation_sets;
 937     enum { new_set, parse_default, parsing_streams, parse_seg_duration, parse_frag_duration } state;
 938     AdaptationSet *as;
 939     int i, n, ret;
 940
 941     // default: one AdaptationSet for each stream
 942     if (!p) {
 943         for (i = 0; i < s->nb_streams; i++) {
 944             if ((ret = add_adaptation_set(s, &as, s->streams[i]->codecpar->codec_type)) < 0)
 945                 return ret;
 946             as->id = i;
 947
 948             c->streams[i].as_idx = c->nb_as;
 949             ++as->nb_streams;
 950         }
 951         goto end;
 952     }
 953
 954     // syntax id=0,streams=0,1,2 id=1,streams=3,4 and so on
 955     // option id=0,descriptor=descriptor_str,streams=0,1,2 and so on
 956     // option id=0,seg_duration=2.5,frag_duration=0.5,streams=0,1,2
 957     //        id=1,trick_id=0,seg_duration=10,frag_type=none,streams=3 and so on
 958     // descriptor is useful to the scheme defined by ISO/IEC 23009-1:2014/Amd.2:2015
 959     // descriptor_str should be a self-closing xml tag.
 960     // seg_duration and frag_duration have the same syntax as the global options of
 961     // the same name, and the former have precedence over them if set.
 962     state = new_set;
 963     while (*p) {
 964         if (*p == ' ') {
 965             p++;
 966             continue;
 967         } else if (state == new_set && av_strstart(p, "id=", &p)) {
 968             char id_str[10], *end_str;
 969
 970             n = strcspn(p, ",");
 971             snprintf(id_str, sizeof(id_str), "%.*s", n, p);
 972
 973             i = strtol(id_str, &end_str, 10);
 974             if (id_str == end_str || i < 0 || i > c->nb_as) {
 975                 av_log(s, AV_LOG_ERROR, "\"%s\" is not a valid value for an AdaptationSet id\n", id_str);
 976                 return AVERROR(EINVAL);
 977             }
 978
 979             if ((ret = add_adaptation_set(s, &as, AVMEDIA_TYPE_UNKNOWN)) < 0)
 980                 return ret;
 981             as->id = i;
 982
 983             p += n;
 984             if (*p)
 985                 p++;
 986             state = parse_default;
 987         } else if (state != new_set && av_strstart(p, "seg_duration=", &p)) {
 988             state = parse_seg_duration;
 989         } else if (state != new_set && av_strstart(p, "frag_duration=", &p)) {
 990             state = parse_frag_duration;
 991         } else if (state == parse_seg_duration || state == parse_frag_duration) {
 992             char str[32];
 993             int64_t usecs = 0;
 994
 995             n = strcspn(p, ",");
 996             snprintf(str, sizeof(str), "%.*s", n, p);
 997             p += n;
 998             if (*p)
 999                 p++;
1000
1001             ret = av_parse_time(&usecs, str, 1);
1002             if (ret < 0) {
1003                 av_log(s, AV_LOG_ERROR, "Unable to parse option value \"%s\" as duration\n", str);
1004                 return ret;
1005             }
1006
1007             if (state == parse_seg_duration)
1008                 as->seg_duration = usecs;
1009             else
1010                 as->frag_duration = usecs;
1011             state = parse_default;
1012         } else if (state != new_set && av_strstart(p, "frag_type=", &p)) {
1013             char type_str[16];
1014
1015             n = strcspn(p, ",");
1016             snprintf(type_str, sizeof(type_str), "%.*s", n, p);
1017             p += n;
1018             if (*p)
1019                 p++;
1020
1021             if (!strcmp(type_str, "duration"))
1022                 as->frag_type = FRAG_TYPE_DURATION;
1023             else if (!strcmp(type_str, "pframes"))
1024                 as->frag_type = FRAG_TYPE_PFRAMES;
1025             else if (!strcmp(type_str, "every_frame"))
1026                 as->frag_type = FRAG_TYPE_EVERY_FRAME;
1027             else if (!strcmp(type_str, "none"))
1028                 as->frag_type = FRAG_TYPE_NONE;
1029             else {
1030                 av_log(s, AV_LOG_ERROR, "Unable to parse option value \"%s\" as fragment type\n", type_str);
1031                 return ret;
1032             }
1033             state = parse_default;
1034         } else if (state != new_set && av_strstart(p, "descriptor=", &p)) {
1035             n = strcspn(p, ">") + 1; //followed by one comma, so plus 1
1036             if (n < strlen(p)) {
1037                 as->descriptor = av_strndup(p, n);
1038             } else {
1039                 av_log(s, AV_LOG_ERROR, "Parse error, descriptor string should be a self-closing xml tag\n");
1040                 return AVERROR(EINVAL);
1041             }
1042             p += n;
1043             if (*p)
1044                 p++;
1045             state = parse_default;
1046         } else if ((state != new_set) && av_strstart(p, "trick_id=", &p)) {
1047             char trick_id_str[10], *end_str;
1048
1049             n = strcspn(p, ",");
1050             snprintf(trick_id_str, sizeof(trick_id_str), "%.*s", n, p);
1051             p += n;
1052
1053             as->trick_idx = strtol(trick_id_str, &end_str, 10);
1054             if (trick_id_str == end_str || as->trick_idx < 0)
1055                 return AVERROR(EINVAL);
1056
1057             if (*p)
1058                 p++;
1059             state = parse_default;
1060         } else if ((state != new_set) && av_strstart(p, "streams=", &p)) { //descriptor and durations are optional
1061             state = parsing_streams;
1062         } else if (state == parsing_streams) {
1063             AdaptationSet *as = &c->as[c->nb_as - 1];
1064             char idx_str[8], *end_str;
1065
1066             n = strcspn(p, " ,");
1067             snprintf(idx_str, sizeof(idx_str), "%.*s", n, p);
1068             p += n;
1069
1070             // if value is "a" or "v", map all streams of that type
1071             if (as->media_type == AVMEDIA_TYPE_UNKNOWN && (idx_str[0] == 'v' || idx_str[0] == 'a')) {
1072                 enum AVMediaType type = (idx_str[0] == 'v') ? AVMEDIA_TYPE_VIDEO : AVMEDIA_TYPE_AUDIO;
1073                 av_log(s, AV_LOG_DEBUG, "Map all streams of type %s\n", idx_str);
1074
1075                 for (i = 0; i < s->nb_streams; i++) {
1076                     if (s->streams[i]->codecpar->codec_type != type)
1077                         continue;
1078
1079                     as->media_type = s->streams[i]->codecpar->codec_type;
1080
1081                     if ((ret = adaptation_set_add_stream(s, c->nb_as, i)) < 0)
1082                         return ret;
1083                 }
1084             } else { // select single stream
1085                 i = strtol(idx_str, &end_str, 10);
1086                 if (idx_str == end_str || i < 0 || i >= s->nb_streams) {
1087                     av_log(s, AV_LOG_ERROR, "Selected stream \"%s\" not found!\n", idx_str);
1088                     return AVERROR(EINVAL);
1089                 }
1090                 av_log(s, AV_LOG_DEBUG, "Map stream %d\n", i);
1091
1092                 if (as->media_type == AVMEDIA_TYPE_UNKNOWN) {
1093                     as->media_type = s->streams[i]->codecpar->codec_type;
1094                 }
1095
1096                 if ((ret = adaptation_set_add_stream(s, c->nb_as, i)) < 0)
1097                     return ret;
1098             }
1099
1100             if (*p == ' ')
1101                 state = new_set;
1102             if (*p)
1103                 p++;
1104         } else {
1105             return AVERROR(EINVAL);
1106         }
1107     }
1108
1109 end:
1110     // check for unassigned streams
1111     for (i = 0; i < s->nb_streams; i++) {
1112         OutputStream *os = &c->streams[i];
1113         if (!os->as_idx) {
1114             av_log(s, AV_LOG_ERROR, "Stream %d is not mapped to an AdaptationSet\n", i);
1115             return AVERROR(EINVAL);
1116         }
1117     }
1118
1119     // check references for trick mode AdaptationSet
1120     for (i = 0; i < c->nb_as; i++) {
1121         as = &c->as[i];
1122         if (as->trick_idx < 0)
1123             continue;
1124         for (n = 0; n < c->nb_as; n++) {
1125             if (c->as[n].id == as->trick_idx)
1126                 break;
1127         }
1128         if (n >= c->nb_as) {
1129             av_log(s, AV_LOG_ERROR, "reference AdaptationSet id \"%d\" not found for trick mode AdaptationSet id \"%d\"\n", as->trick_idx, as->id);
1130             return AVERROR(EINVAL);
1131         }
1132     }
1133
1134     return 0;
1135 }
1136
1137 static int write_manifest(AVFormatContext *s, int final)
1138 {
1139     DASHContext *c = s->priv_data;
1140     AVIOContext *out;
1141     char temp_filename[1024];
1142     int ret, i;
1143     const char *proto = avio_find_protocol_name(s->url);
1144     int use_rename = proto && !strcmp(proto, "file");
1145     static unsigned int warned_non_file = 0;
1146     AVDictionaryEntry *title = av_dict_get(s->metadata, "title", NULL, 0);
1147     AVDictionary *opts = NULL;
1148
1149     if (!use_rename && !warned_non_file++)
1150         av_log(s, AV_LOG_ERROR, "Cannot use rename on non file protocol, this may lead to races and temporary partial files\n");
1151
1152     snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", s->url);
1153     set_http_options(&opts, c);
1154     ret = dashenc_io_open(s, &c->mpd_out, temp_filename, &opts);
1155     av_dict_free(&opts);
1156     if (ret < 0) {
1157         return handle_io_open_error(s, ret, temp_filename);
1158     }
1159     out = c->mpd_out;
1160     avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
1161     avio_printf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
1162                 "\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
1163                 "\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
1164                 "\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
1165                 "\tprofiles=\"");
1166     if (c->profile & MPD_PROFILE_DASH)
1167          avio_printf(out, "%s%s", "urn:mpeg:dash:profile:isoff-live:2011", c->profile & MPD_PROFILE_DVB ? "," : "\"\n");
1168     if (c->profile & MPD_PROFILE_DVB)
1169          avio_printf(out, "%s", "urn:dvb:dash:profile:dvb-dash:2014\"\n");
1170     avio_printf(out, "\ttype=\"%s\"\n",
1171                 final ? "static" : "dynamic");
1172     if (final) {
1173         avio_printf(out, "\tmediaPresentationDuration=\"");
1174         write_time(out, c->total_duration);
1175         avio_printf(out, "\"\n");
1176     } else {
1177         int64_t update_period = c->last_duration / AV_TIME_BASE;
1178         char now_str[100];
1179         if (c->use_template && !c->use_timeline)
1180             update_period = 500;
1181         avio_printf(out, "\tminimumUpdatePeriod=\"PT%"PRId64"S\"\n", update_period);
1182         if (!c->ldash)
1183             avio_printf(out, "\tsuggestedPresentationDelay=\"PT%"PRId64"S\"\n", c->last_duration / AV_TIME_BASE);
1184         if (c->availability_start_time[0])
1185             avio_printf(out, "\tavailabilityStartTime=\"%s\"\n", c->availability_start_time);
1186         format_date(now_str, sizeof(now_str), av_gettime());
1187         if (now_str[0])
1188             avio_printf(out, "\tpublishTime=\"%s\"\n", now_str);
1189         if (c->window_size && c->use_template) {
1190             avio_printf(out, "\ttimeShiftBufferDepth=\"");
1191             write_time(out, c->last_duration * c->window_size);
1192             avio_printf(out, "\"\n");
1193         }
1194     }
1195     avio_printf(out, "\tmaxSegmentDuration=\"");
1196     write_time(out, c->max_segment_duration);
1197     avio_printf(out, "\"\n");
1198     avio_printf(out, "\tminBufferTime=\"");
1199     write_time(out, c->ldash && c->max_gop_size ? c->max_gop_size : c->last_duration * 2);
1200     avio_printf(out, "\">\n");
1201     avio_printf(out, "\t<ProgramInformation>\n");
1202     if (title) {
1203         char *escaped = xmlescape(title->value);
1204         avio_printf(out, "\t\t<Title>%s</Title>\n", escaped);
1205         av_free(escaped);
1206     }
1207     avio_printf(out, "\t</ProgramInformation>\n");
1208
1209     avio_printf(out, "\t<ServiceDescription id=\"0\">\n");
1210     if (!final && c->target_latency && c->target_latency_refid >= 0) {
1211         avio_printf(out, "\t\t<Latency target=\"%"PRId64"\"", c->target_latency / 1000);
1212         if (s->nb_streams > 1)
1213             avio_printf(out, " referenceId=\"%d\"", c->target_latency_refid);
1214         avio_printf(out, "/>\n");
1215     }
1216     if (av_cmp_q(c->min_playback_rate, (AVRational) {1, 1}) ||
1217         av_cmp_q(c->max_playback_rate, (AVRational) {1, 1}))
1218         avio_printf(out, "\t\t<PlaybackRate min=\"%.2f\" max=\"%.2f\"/>\n",
1219                     av_q2d(c->min_playback_rate), av_q2d(c->max_playback_rate));
1220     avio_printf(out, "\t</ServiceDescription>\n");
1221
1222     if (c->window_size && s->nb_streams > 0 && c->streams[0].nb_segments > 0 && !c->use_template) {
1223         OutputStream *os = &c->streams[0];
1224         int start_index = FFMAX(os->nb_segments - c->window_size, 0);
1225         int64_t start_time = av_rescale_q(os->segments[start_index]->time, s->streams[0]->time_base, AV_TIME_BASE_Q);
1226         avio_printf(out, "\t<Period id=\"0\" start=\"");
1227         write_time(out, start_time);
1228         avio_printf(out, "\">\n");
1229     } else {
1230         avio_printf(out, "\t<Period id=\"0\" start=\"PT0.0S\">\n");
1231     }
1232
1233     for (i = 0; i < c->nb_as; i++) {
1234         if ((ret = write_adaptation_set(s, out, i, final)) < 0)
1235             return ret;
1236     }
1237     avio_printf(out, "\t</Period>\n");
1238
1239     if (c->utc_timing_url)
1240         avio_printf(out, "\t<UTCTiming schemeIdUri=\"urn:mpeg:dash:utc:http-xsdate:2014\" value=\"%s\"/>\n", c->utc_timing_url);
1241
1242     avio_printf(out, "</MPD>\n");
1243     avio_flush(out);
1244     dashenc_io_close(s, &c->mpd_out, temp_filename);
1245
1246     if (use_rename) {
1247         if ((ret = ff_rename(temp_filename, s->url, s)) < 0)
1248             return ret;
1249     }
1250
1251     if (c->hls_playlist) {
1252         char filename_hls[1024];
1253         const char *audio_group = "A1";
1254         char audio_codec_str[128] = "\0";
1255         int is_default = 1;
1256         int max_audio_bitrate = 0;
1257
1258         // Publish master playlist only the configured rate
1259         if (c->master_playlist_created && (!c->master_publish_rate ||
1260              c->streams[0].segment_index % c->master_publish_rate))
1261             return 0;
1262
1263         if (*c->dirname)
1264             snprintf(filename_hls, sizeof(filename_hls), "%smaster.m3u8", c->dirname);
1265         else
1266             snprintf(filename_hls, sizeof(filename_hls), "master.m3u8");
1267
1268         snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", filename_hls);
1269
1270         set_http_options(&opts, c);
1271         ret = dashenc_io_open(s, &c->m3u8_out, temp_filename, &opts);
1272         av_dict_free(&opts);
1273         if (ret < 0) {
1274             return handle_io_open_error(s, ret, temp_filename);
1275         }
1276
1277         ff_hls_write_playlist_version(c->m3u8_out, 7);
1278
1279         for (i = 0; i < s->nb_streams; i++) {
1280             char playlist_file[64];
1281             AVStream *st = s->streams[i];
1282             OutputStream *os = &c->streams[i];
1283             if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
1284                 continue;
1285             if (os->segment_type != SEGMENT_TYPE_MP4)
1286                 continue;
1287             get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i);
1288             ff_hls_write_audio_rendition(c->m3u8_out, (char *)audio_group,
1289                                          playlist_file, NULL, i, is_default);
1290             max_audio_bitrate = FFMAX(st->codecpar->bit_rate +
1291                                       os->muxer_overhead, max_audio_bitrate);
1292             if (!av_strnstr(audio_codec_str, os->codec_str, sizeof(audio_codec_str))) {
1293                 if (strlen(audio_codec_str))
1294                     av_strlcat(audio_codec_str, ",", sizeof(audio_codec_str));
1295                 av_strlcat(audio_codec_str, os->codec_str, sizeof(audio_codec_str));
1296             }
1297             is_default = 0;
1298         }
1299
1300         for (i = 0; i < s->nb_streams; i++) {
1301             char playlist_file[64];
1302             char codec_str[128];
1303             AVStream *st = s->streams[i];
1304             OutputStream *os = &c->streams[i];
1305             char *agroup = NULL;
1306             char *codec_str_ptr = NULL;
1307             int stream_bitrate = st->codecpar->bit_rate + os->muxer_overhead;
1308             if (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
1309                 continue;
1310             if (os->segment_type != SEGMENT_TYPE_MP4)
1311                 continue;
1312             av_strlcpy(codec_str, os->codec_str, sizeof(codec_str));
1313             if (max_audio_bitrate) {
1314                 agroup = (char *)audio_group;
1315                 stream_bitrate += max_audio_bitrate;
1316                 av_strlcat(codec_str, ",", sizeof(codec_str));
1317                 av_strlcat(codec_str, audio_codec_str, sizeof(codec_str));
1318             }
1319             if (st->codecpar->codec_id != AV_CODEC_ID_HEVC) {
1320                 codec_str_ptr = codec_str;
1321             }
1322             get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i);
1323             ff_hls_write_stream_info(st, c->m3u8_out, stream_bitrate,
1324                                      playlist_file, agroup,
1325                                      codec_str_ptr, NULL, NULL);
1326         }
1327         dashenc_io_close(s, &c->m3u8_out, temp_filename);
1328         if (use_rename)
1329             if ((ret = ff_rename(temp_filename, filename_hls, s)) < 0)
1330                 return ret;
1331         c->master_playlist_created = 1;
1332     }
1333
1334     return 0;
1335 }
1336
1337 static int dict_copy_entry(AVDictionary **dst, const AVDictionary *src, const char *key)
1338 {
1339     AVDictionaryEntry *entry = av_dict_get(src, key, NULL, 0);
1340     if (entry)
1341         av_dict_set(dst, key, entry->value, AV_DICT_DONT_OVERWRITE);
1342     return 0;
1343 }
1344
1345 static int dash_init(AVFormatContext *s)
1346 {
1347     DASHContext *c = s->priv_data;
1348     int ret = 0, i;
1349     char *ptr;
1350     char basename[1024];
1351
1352     c->nr_of_streams_to_flush = 0;
1353     if (c->single_file_name)
1354         c->single_file = 1;
1355     if (c->single_file)
1356         c->use_template = 0;
1357
1358     if (!c->profile) {
1359         av_log(s, AV_LOG_ERROR, "At least one profile must be enabled.\n");
1360         return AVERROR(EINVAL);
1361     }
1362 #if FF_API_DASH_MIN_SEG_DURATION
1363     if (c->min_seg_duration != 5000000) {
1364         av_log(s, AV_LOG_WARNING, "The min_seg_duration option is deprecated and will be removed. Please use the -seg_duration\n");
1365         c->seg_duration = c->min_seg_duration;
1366     }
1367 #endif
1368     if (c->lhls && s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
1369         av_log(s, AV_LOG_ERROR,
1370                "LHLS is experimental, Please set -strict experimental in order to enable it.\n");
1371         return AVERROR_EXPERIMENTAL;
1372     }
1373
1374     if (c->lhls && !c->streaming) {
1375         av_log(s, AV_LOG_WARNING, "LHLS option will be ignored as streaming is not enabled\n");
1376         c->lhls = 0;
1377     }
1378
1379     if (c->lhls && !c->hls_playlist) {
1380         av_log(s, AV_LOG_WARNING, "LHLS option will be ignored as hls_playlist is not enabled\n");
1381         c->lhls = 0;
1382     }
1383
1384     if (c->ldash && !c->streaming) {
1385         av_log(s, AV_LOG_WARNING, "LDash option will be ignored as streaming is not enabled\n");
1386         c->ldash = 0;
1387     }
1388
1389     if (c->target_latency && !c->streaming) {
1390         av_log(s, AV_LOG_WARNING, "Target latency option will be ignored as streaming is not enabled\n");
1391         c->target_latency = 0;
1392     }
1393
1394     if (c->global_sidx && !c->single_file) {
1395         av_log(s, AV_LOG_WARNING, "Global SIDX option will be ignored as single_file is not enabled\n");
1396         c->global_sidx = 0;
1397     }
1398
1399     if (c->global_sidx && c->streaming) {
1400         av_log(s, AV_LOG_WARNING, "Global SIDX option will be ignored as streaming is enabled\n");
1401         c->global_sidx = 0;
1402     }
1403     if (c->frag_type == FRAG_TYPE_NONE && c->streaming) {
1404         av_log(s, AV_LOG_VERBOSE, "Changing frag_type from none to every_frame as streaming is enabled\n");
1405         c->frag_type = FRAG_TYPE_EVERY_FRAME;
1406     }
1407
1408     if (c->write_prft < 0) {
1409         c->write_prft = c->ldash;
1410         if (c->ldash)
1411             av_log(s, AV_LOG_VERBOSE, "Enabling Producer Reference Time element for Low Latency mode\n");
1412     }
1413
1414     if (c->write_prft && !c->utc_timing_url) {
1415         av_log(s, AV_LOG_WARNING, "Producer Reference Time element option will be ignored as utc_timing_url is not set\n");
1416         c->write_prft = 0;
1417     }
1418
1419     if (c->write_prft && !c->streaming) {
1420         av_log(s, AV_LOG_WARNING, "Producer Reference Time element option will be ignored as streaming is not enabled\n");
1421         c->write_prft = 0;
1422     }
1423
1424     if (c->ldash && !c->write_prft) {
1425         av_log(s, AV_LOG_WARNING, "Low Latency mode enabled without Producer Reference Time element option! Resulting manifest may not be complaint\n");
1426     }
1427
1428     if (c->target_latency && !c->write_prft) {
1429         av_log(s, AV_LOG_WARNING, "Target latency option will be ignored as Producer Reference Time element will not be written\n");
1430         c->target_latency = 0;
1431     }
1432
1433     if (av_cmp_q(c->max_playback_rate, c->min_playback_rate) < 0) {
1434         av_log(s, AV_LOG_WARNING, "Minimum playback rate value is higer than the Maximum. Both will be ignored\n");
1435         c->min_playback_rate = c->max_playback_rate = (AVRational) {1, 1};
1436     }
1437
1438     av_strlcpy(c->dirname, s->url, sizeof(c->dirname));
1439     ptr = strrchr(c->dirname, '/');
1440     if (ptr) {
1441         av_strlcpy(basename, &ptr[1], sizeof(basename));
1442         ptr[1] = '\0';
1443     } else {
1444         c->dirname[0] = '\0';
1445         av_strlcpy(basename, s->url, sizeof(basename));
1446     }
1447
1448     ptr = strrchr(basename, '.');
1449     if (ptr)
1450         *ptr = '\0';
1451
1452     c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams);
1453     if (!c->streams)
1454         return AVERROR(ENOMEM);
1455
1456     if ((ret = parse_adaptation_sets(s)) < 0)
1457         return ret;
1458
1459     if ((ret = init_segment_types(s)) < 0)
1460         return ret;
1461
1462     for (i = 0; i < s->nb_streams; i++) {
1463         OutputStream *os = &c->streams[i];
1464         AdaptationSet *as = &c->as[os->as_idx - 1];
1465         AVFormatContext *ctx;
1466         AVStream *st;
1467         AVDictionary *opts = NULL;
1468         char filename[1024];
1469
1470         os->bit_rate = s->streams[i]->codecpar->bit_rate;
1471         if (!os->bit_rate) {
1472             int level = s->strict_std_compliance >= FF_COMPLIANCE_STRICT ?
1473                         AV_LOG_ERROR : AV_LOG_WARNING;
1474             av_log(s, level, "No bit rate set for stream %d\n", i);
1475             if (s->strict_std_compliance >= FF_COMPLIANCE_STRICT)
1476                 return AVERROR(EINVAL);
1477         }
1478
1479         // copy AdaptationSet language and role from stream metadata
1480         dict_copy_entry(&as->metadata, s->streams[i]->metadata, "language");
1481         dict_copy_entry(&as->metadata, s->streams[i]->metadata, "role");
1482
1483         if (c->init_seg_name) {
1484             os->init_seg_name = av_strireplace(c->init_seg_name, "$ext$", os->extension_name);
1485             if (!os->init_seg_name)
1486                 return AVERROR(ENOMEM);
1487         }
1488         if (c->media_seg_name) {
1489             os->media_seg_name = av_strireplace(c->media_seg_name, "$ext$", os->extension_name);
1490             if (!os->media_seg_name)
1491                 return AVERROR(ENOMEM);
1492         }
1493         if (c->single_file_name) {
1494             os->single_file_name = av_strireplace(c->single_file_name, "$ext$", os->extension_name);
1495             if (!os->single_file_name)
1496                 return AVERROR(ENOMEM);
1497         }
1498
1499         if (os->segment_type == SEGMENT_TYPE_WEBM) {
1500             if ((!c->single_file && check_file_extension(os->init_seg_name, os->format_name) != 0) ||
1501                 (!c->single_file && check_file_extension(os->media_seg_name, os->format_name) != 0) ||
1502                 (c->single_file && check_file_extension(os->single_file_name, os->format_name) != 0)) {
1503                 av_log(s, AV_LOG_WARNING,
1504                        "One or many segment file names doesn't end with .webm. "
1505                        "Override -init_seg_name and/or -media_seg_name and/or "
1506                        "-single_file_name to end with the extension .webm\n");
1507             }
1508             if (c->streaming) {
1509                 // Streaming not supported as matroskaenc buffers internally before writing the output
1510                 av_log(s, AV_LOG_WARNING, "One or more streams in WebM output format. Streaming option will be ignored\n");
1511                 c->streaming = 0;
1512             }
1513         }
1514
1515         os->ctx = ctx = avformat_alloc_context();
1516         if (!ctx)
1517             return AVERROR(ENOMEM);
1518
1519         ctx->oformat = av_guess_format(os->format_name, NULL, NULL);
1520         if (!ctx->oformat)
1521             return AVERROR_MUXER_NOT_FOUND;
1522         ctx->interrupt_callback    = s->interrupt_callback;
1523         ctx->opaque                = s->opaque;
1524         ctx->io_close              = s->io_close;
1525         ctx->io_open               = s->io_open;
1526         ctx->strict_std_compliance = s->strict_std_compliance;
1527
1528         if (!(st = avformat_new_stream(ctx, NULL)))
1529             return AVERROR(ENOMEM);
1530         avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
1531         st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
1532         st->time_base = s->streams[i]->time_base;
1533         st->avg_frame_rate = s->streams[i]->avg_frame_rate;
1534         ctx->avoid_negative_ts = s->avoid_negative_ts;
1535         ctx->flags = s->flags;
1536
1537         os->parser = av_parser_init(st->codecpar->codec_id);
1538         if (os->parser) {
1539             os->parser_avctx = avcodec_alloc_context3(NULL);
1540             if (!os->parser_avctx)
1541                 return AVERROR(ENOMEM);
1542             ret = avcodec_parameters_to_context(os->parser_avctx, st->codecpar);
1543             if (ret < 0)
1544                 return ret;
1545             // We only want to parse frame headers
1546             os->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
1547         }
1548
1549         if (c->single_file) {
1550             if (os->single_file_name)
1551                 ff_dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), os->single_file_name, i, 0, os->bit_rate, 0);
1552             else
1553                 snprintf(os->initfile, sizeof(os->initfile), "%s-stream%d.%s", basename, i, os->format_name);
1554         } else {
1555             ff_dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), os->init_seg_name, i, 0, os->bit_rate, 0);
1556         }
1557         snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
1558         set_http_options(&opts, c);
1559         if (!c->single_file) {
1560             if ((ret = avio_open_dyn_buf(&ctx->pb)) < 0)
1561                 return ret;
1562             ret = s->io_open(s, &os->out, filename, AVIO_FLAG_WRITE, &opts);
1563         } else {
1564             ctx->url = av_strdup(filename);
1565             ret = avio_open2(&ctx->pb, filename, AVIO_FLAG_WRITE, NULL, &opts);
1566         }
1567         av_dict_free(&opts);
1568         if (ret < 0)
1569             return ret;
1570         os->init_start_pos = 0;
1571
1572         av_dict_copy(&opts, c->format_options, 0);
1573         if (!as->seg_duration)
1574             as->seg_duration = c->seg_duration;
1575         if (!as->frag_duration)
1576             as->frag_duration = c->frag_duration;
1577         if (as->frag_type < 0)
1578             as->frag_type = c->frag_type;
1579         os->seg_duration = as->seg_duration;
1580         os->frag_duration = as->frag_duration;
1581         os->frag_type = as->frag_type;
1582
1583         c->max_segment_duration = FFMAX(c->max_segment_duration, as->seg_duration);
1584
1585         if (c->profile & MPD_PROFILE_DVB && (os->seg_duration > 15000000 || os->seg_duration < 960000)) {
1586             av_log(s, AV_LOG_ERROR, "Segment duration %"PRId64" is outside the allowed range for DVB-DASH profile\n", os->seg_duration);
1587             return AVERROR(EINVAL);
1588         }
1589
1590         if (os->frag_type == FRAG_TYPE_DURATION && !os->frag_duration) {
1591             av_log(s, AV_LOG_WARNING, "frag_type set to duration for stream %d but no frag_duration set\n", i);
1592             os->frag_type = c->streaming ? FRAG_TYPE_EVERY_FRAME : FRAG_TYPE_NONE;
1593         }
1594         if (os->frag_type == FRAG_TYPE_DURATION && os->frag_duration > os->seg_duration) {
1595             av_log(s, AV_LOG_ERROR, "Fragment duration %"PRId64" is longer than Segment duration %"PRId64"\n", os->frag_duration, os->seg_duration);
1596             return AVERROR(EINVAL);
1597         }
1598         if (os->frag_type == FRAG_TYPE_PFRAMES && (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO || !os->parser)) {
1599             if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && !os->parser)
1600                 av_log(s, AV_LOG_WARNING, "frag_type set to P-Frame reordering, but no parser found for stream %d\n", i);
1601             os->frag_type = c->streaming ? FRAG_TYPE_EVERY_FRAME : FRAG_TYPE_NONE;
1602         }
1603         if (os->frag_type != FRAG_TYPE_PFRAMES && as->trick_idx < 0)
1604             // Set this now if a parser isn't used
1605             os->coding_dependency = 1;
1606
1607         if (os->segment_type == SEGMENT_TYPE_MP4) {
1608             if (c->streaming)
1609                 // skip_sidx : Reduce bitrate overhead
1610                 // skip_trailer : Avoids growing memory usage with time
1611                 av_dict_set(&opts, "movflags", "+dash+delay_moov+skip_sidx+skip_trailer", AV_DICT_APPEND);
1612             else {
1613                 if (c->global_sidx)
1614                     av_dict_set(&opts, "movflags", "+dash+delay_moov+global_sidx+skip_trailer", AV_DICT_APPEND);
1615                 else
1616                     av_dict_set(&opts, "movflags", "+dash+delay_moov+skip_trailer", AV_DICT_APPEND);
1617             }
1618             if (os->frag_type == FRAG_TYPE_EVERY_FRAME)
1619                 av_dict_set(&opts, "movflags", "+frag_every_frame", AV_DICT_APPEND);
1620             else
1621                 av_dict_set(&opts, "movflags", "+frag_custom", AV_DICT_APPEND);
1622             if (os->frag_type == FRAG_TYPE_DURATION)
1623                 av_dict_set_int(&opts, "frag_duration", os->frag_duration, 0);
1624             if (c->write_prft)
1625                 av_dict_set(&opts, "write_prft", "wallclock", 0);
1626         } else {
1627             av_dict_set_int(&opts, "cluster_time_limit", c->seg_duration / 1000, 0);
1628             av_dict_set_int(&opts, "cluster_size_limit", 5 * 1024 * 1024, 0); // set a large cluster size limit
1629             av_dict_set_int(&opts, "dash", 1, 0);
1630             av_dict_set_int(&opts, "dash_track_number", i + 1, 0);
1631             av_dict_set_int(&opts, "live", 1, 0);
1632         }
1633         ret = avformat_init_output(ctx, &opts);
1634         av_dict_free(&opts);
1635         if (ret < 0)
1636             return ret;
1637         os->ctx_inited = 1;
1638         avio_flush(ctx->pb);
1639
1640         av_log(s, AV_LOG_VERBOSE, "Representation %d init segment will be written to: %s\n", i, filename);
1641
1642         s->streams[i]->time_base = st->time_base;
1643         // If the muxer wants to shift timestamps, request to have them shifted
1644         // already before being handed to this muxer, so we don't have mismatches
1645         // between the MPD and the actual segments.
1646         s->avoid_negative_ts = ctx->avoid_negative_ts;
1647         if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
1648             AVRational avg_frame_rate = s->streams[i]->avg_frame_rate;
1649             AVRational par;
1650             if (avg_frame_rate.num > 0) {
1651                 if (av_cmp_q(avg_frame_rate, as->min_frame_rate) < 0)
1652                     as->min_frame_rate = avg_frame_rate;
1653                 if (av_cmp_q(as->max_frame_rate, avg_frame_rate) < 0)
1654                     as->max_frame_rate = avg_frame_rate;
1655             } else {
1656                 as->ambiguous_frame_rate = 1;
1657             }
1658
1659             if (st->codecpar->width > as->max_width)
1660                 as->max_width = st->codecpar->width;
1661             if (st->codecpar->height > as->max_height)
1662                 as->max_height = st->codecpar->height;
1663
1664             if (st->sample_aspect_ratio.num)
1665                 os->sar = st->sample_aspect_ratio;
1666             else
1667                 os->sar = (AVRational){1,1};
1668             av_reduce(&par.num, &par.den,
1669                       st->codecpar->width * (int64_t)os->sar.num,
1670                       st->codecpar->height * (int64_t)os->sar.den,
1671                       1024 * 1024);
1672
1673             if (as->par.num && av_cmp_q(par, as->par)) {
1674                 av_log(s, AV_LOG_ERROR, "Conflicting stream par values in Adaptation Set %d\n", os->as_idx);
1675                 return AVERROR(EINVAL);
1676             }
1677             as->par = par;
1678
1679             c->has_video = 1;
1680         }
1681
1682         set_codec_str(s, st->codecpar, &st->avg_frame_rate, os->codec_str,
1683                       sizeof(os->codec_str));
1684         os->first_pts = AV_NOPTS_VALUE;
1685         os->max_pts = AV_NOPTS_VALUE;
1686         os->last_dts = AV_NOPTS_VALUE;
1687         os->segment_index = 1;
1688
1689         if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
1690             c->nr_of_streams_to_flush++;
1691     }
1692
1693     if (!c->has_video && c->seg_duration <= 0) {
1694         av_log(s, AV_LOG_WARNING, "no video stream and no seg duration set\n");
1695         return AVERROR(EINVAL);
1696     }
1697     if (!c->has_video && c->frag_type == FRAG_TYPE_PFRAMES)
1698         av_log(s, AV_LOG_WARNING, "no video stream and P-frame fragmentation set\n");
1699
1700     c->nr_of_streams_flushed = 0;
1701     c->target_latency_refid = -1;
1702
1703     return 0;
1704 }
1705
1706 static int dash_write_header(AVFormatContext *s)
1707 {
1708     DASHContext *c = s->priv_data;
1709     int i, ret;
1710     for (i = 0; i < s->nb_streams; i++) {
1711         OutputStream *os = &c->streams[i];
1712         if ((ret = avformat_write_header(os->ctx, NULL)) < 0)
1713             return ret;
1714
1715         // Flush init segment
1716         // Only for WebM segment, since for mp4 delay_moov is set and
1717         // the init segment is thus flushed after the first packets.
1718         if (os->segment_type == SEGMENT_TYPE_WEBM &&
1719             (ret = flush_init_segment(s, os)) < 0)
1720             return ret;
1721     }
1722     return ret;
1723 }
1724
1725 static int add_segment(OutputStream *os, const char *file,
1726                        int64_t time, int64_t duration,
1727                        int64_t start_pos, int64_t range_length,
1728                        int64_t index_length, int next_exp_index)
1729 {
1730     int err;
1731     Segment *seg;
1732     if (os->nb_segments >= os->segments_size) {
1733         os->segments_size = (os->segments_size + 1) * 2;
1734         if ((err = av_reallocp_array(&os->segments, sizeof(*os->segments),
1735                                os->segments_size)) < 0) {
1736             os->segments_size = 0;
1737             os->nb_segments = 0;
1738             return err;
1739         }
1740     }
1741     seg = av_mallocz(sizeof(*seg));
1742     if (!seg)
1743         return AVERROR(ENOMEM);
1744     av_strlcpy(seg->file, file, sizeof(seg->file));
1745     seg->time = time;
1746     seg->duration = duration;
1747     if (seg->time < 0) { // If pts<0, it is expected to be cut away with an edit list
1748         seg->duration += seg->time;
1749         seg->time = 0;
1750     }
1751     seg->start_pos = start_pos;
1752     seg->range_length = range_length;
1753     seg->index_length = index_length;
1754     os->segments[os->nb_segments++] = seg;
1755     os->segment_index++;
1756     //correcting the segment index if it has fallen behind the expected value
1757     if (os->segment_index < next_exp_index) {
1758         av_log(NULL, AV_LOG_WARNING, "Correcting the segment index after file %s: current=%d corrected=%d\n",
1759                file, os->segment_index, next_exp_index);
1760         os->segment_index = next_exp_index;
1761     }
1762     return 0;
1763 }
1764
1765 static void write_styp(AVIOContext *pb)
1766 {
1767     avio_wb32(pb, 24);
1768     ffio_wfourcc(pb, "styp");
1769     ffio_wfourcc(pb, "msdh");
1770     avio_wb32(pb, 0); /* minor */
1771     ffio_wfourcc(pb, "msdh");
1772     ffio_wfourcc(pb, "msix");
1773 }
1774
1775 static void find_index_range(AVFormatContext *s, const char *full_path,
1776                              int64_t pos, int *index_length)
1777 {
1778     uint8_t buf[8];
1779     AVIOContext *pb;
1780     int ret;
1781
1782     ret = s->io_open(s, &pb, full_path, AVIO_FLAG_READ, NULL);
1783     if (ret < 0)
1784         return;
1785     if (avio_seek(pb, pos, SEEK_SET) != pos) {
1786         ff_format_io_close(s, &pb);
1787         return;
1788     }
1789     ret = avio_read(pb, buf, 8);
1790     ff_format_io_close(s, &pb);
1791     if (ret < 8)
1792         return;
1793     if (AV_RL32(&buf[4]) != MKTAG('s', 'i', 'd', 'x'))
1794         return;
1795     *index_length = AV_RB32(&buf[0]);
1796 }
1797
1798 static int update_stream_extradata(AVFormatContext *s, OutputStream *os,
1799                                    AVPacket *pkt, AVRational *frame_rate)
1800 {
1801     AVCodecParameters *par = os->ctx->streams[0]->codecpar;
1802     uint8_t *extradata;
1803     int ret, extradata_size;
1804
1805     if (par->extradata_size)
1806         return 0;
1807
1808     extradata = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &extradata_size);
1809     if (!extradata_size)
1810         return 0;
1811
1812     ret = ff_alloc_extradata(par, extradata_size);
1813     if (ret < 0)
1814         return ret;
1815
1816     memcpy(par->extradata, extradata, extradata_size);
1817
1818     set_codec_str(s, par, frame_rate, os->codec_str, sizeof(os->codec_str));
1819
1820     return 0;
1821 }
1822
1823 static void dashenc_delete_file(AVFormatContext *s, char *filename) {
1824     DASHContext *c = s->priv_data;
1825     int http_base_proto = ff_is_http_proto(filename);
1826
1827     if (http_base_proto) {
1828         AVIOContext *out = NULL;
1829         AVDictionary *http_opts = NULL;
1830
1831         set_http_options(&http_opts, c);
1832         av_dict_set(&http_opts, "method", "DELETE", 0);
1833
1834         if (dashenc_io_open(s, &out, filename, &http_opts) < 0) {
1835             av_log(s, AV_LOG_ERROR, "failed to delete %s\n", filename);
1836         }
1837
1838         av_dict_free(&http_opts);
1839         ff_format_io_close(s, &out);
1840     } else {
1841         int res = avpriv_io_delete(filename);
1842         if (res < 0) {
1843             char errbuf[AV_ERROR_MAX_STRING_SIZE];
1844             av_strerror(res, errbuf, sizeof(errbuf));
1845             av_log(s, (res == AVERROR(ENOENT) ? AV_LOG_WARNING : AV_LOG_ERROR), "failed to delete %s: %s\n", filename, errbuf);
1846         }
1847     }
1848 }
1849
1850 static int dashenc_delete_segment_file(AVFormatContext *s, const char* file)
1851 {
1852     DASHContext *c = s->priv_data;
1853     AVBPrint buf;
1854
1855     av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
1856
1857     av_bprintf(&buf, "%s%s", c->dirname, file);
1858     if (!av_bprint_is_complete(&buf)) {
1859         av_bprint_finalize(&buf, NULL);
1860         av_log(s, AV_LOG_WARNING, "Out of memory for filename\n");
1861         return AVERROR(ENOMEM);
1862     }
1863
1864     dashenc_delete_file(s, buf.str);
1865
1866     av_bprint_finalize(&buf, NULL);
1867     return 0;
1868 }
1869
1870 static inline void dashenc_delete_media_segments(AVFormatContext *s, OutputStream *os, int remove_count)
1871 {
1872     for (int i = 0; i < remove_count; ++i) {
1873         dashenc_delete_segment_file(s, os->segments[i]->file);
1874
1875         // Delete the segment regardless of whether the file was successfully deleted
1876         av_free(os->segments[i]);
1877     }
1878
1879     os->nb_segments -= remove_count;
1880     memmove(os->segments, os->segments + remove_count, os->nb_segments * sizeof(*os->segments));
1881 }
1882
1883 static int dash_flush(AVFormatContext *s, int final, int stream)
1884 {
1885     DASHContext *c = s->priv_data;
1886     int i, ret = 0;
1887
1888     const char *proto = avio_find_protocol_name(s->url);
1889     int use_rename = proto && !strcmp(proto, "file");
1890
1891     int cur_flush_segment_index = 0, next_exp_index = -1;
1892     if (stream >= 0) {
1893         cur_flush_segment_index = c->streams[stream].segment_index;
1894
1895         //finding the next segment's expected index, based on the current pts value
1896         if (c->use_template && !c->use_timeline && c->index_correction &&
1897             c->streams[stream].last_pts != AV_NOPTS_VALUE &&
1898             c->streams[stream].first_pts != AV_NOPTS_VALUE) {
1899             int64_t pts_diff = av_rescale_q(c->streams[stream].last_pts -
1900                                             c->streams[stream].first_pts,
1901                                             s->streams[stream]->time_base,
1902                                             AV_TIME_BASE_Q);
1903             next_exp_index = (pts_diff / c->streams[stream].seg_duration) + 1;
1904         }
1905     }
1906
1907     for (i = 0; i < s->nb_streams; i++) {
1908         OutputStream *os = &c->streams[i];
1909         AVStream *st = s->streams[i];
1910         int range_length, index_length = 0;
1911         int64_t duration;
1912
1913         if (!os->packets_written)
1914             continue;
1915
1916         // Flush the single stream that got a keyframe right now.
1917         // Flush all audio streams as well, in sync with video keyframes,
1918         // but not the other video streams.
1919         if (stream >= 0 && i != stream) {
1920             if (s->streams[stream]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO &&
1921                 s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
1922                 continue;
1923             if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
1924                 continue;
1925             // Make sure we don't flush audio streams multiple times, when
1926             // all video streams are flushed one at a time.
1927             if (c->has_video && os->segment_index > cur_flush_segment_index)
1928                 continue;
1929         }
1930
1931         if (c->single_file)
1932             snprintf(os->full_path, sizeof(os->full_path), "%s%s", c->dirname, os->initfile);
1933
1934         ret = flush_dynbuf(c, os, &range_length);
1935         if (ret < 0)
1936             break;
1937         os->packets_written = 0;
1938
1939         if (c->single_file) {
1940             find_index_range(s, os->full_path, os->pos, &index_length);
1941         } else {
1942             dashenc_io_close(s, &os->out, os->temp_path);
1943
1944             if (use_rename) {
1945                 ret = ff_rename(os->temp_path, os->full_path, os->ctx);
1946                 if (ret < 0)
1947                     break;
1948             }
1949         }
1950
1951         duration = av_rescale_q(os->max_pts - os->start_pts, st->time_base, AV_TIME_BASE_Q);
1952         os->last_duration = FFMAX(os->last_duration, duration);
1953
1954         if (!os->muxer_overhead && os->max_pts > os->start_pts)
1955             os->muxer_overhead = ((int64_t) (range_length - os->total_pkt_size) *
1956                                   8 * AV_TIME_BASE) / duration;
1957         os->total_pkt_size = 0;
1958         os->total_pkt_duration = 0;
1959
1960         if (!os->bit_rate) {
1961             // calculate average bitrate of first segment
1962             int64_t bitrate = (int64_t) range_length * 8 * (c->use_timeline ? os->ctx->streams[0]->time_base.den : AV_TIME_BASE) / duration;
1963             if (bitrate >= 0)
1964                 os->bit_rate = bitrate;
1965         }
1966         add_segment(os, os->filename, os->start_pts, os->max_pts - os->start_pts, os->pos, range_length, index_length, next_exp_index);
1967         av_log(s, AV_LOG_VERBOSE, "Representation %d media segment %d written to: %s\n", i, os->segment_index, os->full_path);
1968
1969         os->pos += range_length;
1970     }
1971
1972     if (c->window_size) {
1973         for (i = 0; i < s->nb_streams; i++) {
1974             OutputStream *os = &c->streams[i];
1975             int remove_count = os->nb_segments - c->window_size - c->extra_window_size;
1976             if (remove_count > 0)
1977                 dashenc_delete_media_segments(s, os, remove_count);
1978         }
1979     }
1980
1981     if (final) {
1982         for (i = 0; i < s->nb_streams; i++) {
1983             OutputStream *os = &c->streams[i];
1984             if (os->ctx && os->ctx_inited) {
1985                 int64_t file_size = avio_tell(os->ctx->pb);
1986                 av_write_trailer(os->ctx);
1987                 if (c->global_sidx) {
1988                     int j, start_index, start_number;
1989                     int64_t sidx_size = avio_tell(os->ctx->pb) - file_size;
1990                     get_start_index_number(os, c, &start_index, &start_number);
1991                     if (start_index >= os->nb_segments ||
1992                         os->segment_type != SEGMENT_TYPE_MP4)
1993                         continue;
1994                     os->init_range_length += sidx_size;
1995                     for (j = start_index; j < os->nb_segments; j++) {
1996                         Segment *seg = os->segments[j];
1997                         seg->start_pos += sidx_size;
1998                     }
1999                 }
2000
2001             }
2002         }
2003     }
2004     if (ret >= 0) {
2005         if (c->has_video && !final) {
2006             c->nr_of_streams_flushed++;
2007             if (c->nr_of_streams_flushed != c->nr_of_streams_to_flush)
2008                 return ret;
2009
2010             c->nr_of_streams_flushed = 0;
2011         }
2012         ret = write_manifest(s, final);
2013     }
2014     return ret;
2015 }
2016
2017 static int dash_parse_prft(DASHContext *c, AVPacket *pkt)
2018 {
2019     OutputStream *os = &c->streams[pkt->stream_index];
2020     AVProducerReferenceTime *prft;
2021     int side_data_size;
2022
2023     prft = (AVProducerReferenceTime *)av_packet_get_side_data(pkt, AV_PKT_DATA_PRFT, &side_data_size);
2024     if (!prft || side_data_size != sizeof(AVProducerReferenceTime) || (prft->flags && prft->flags != 24)) {
2025         // No encoder generated or user provided capture time AVProducerReferenceTime side data. Instead
2026         // of letting the mov muxer generate one, do it here so we can also use it for the manifest.
2027         prft = (AVProducerReferenceTime *)av_packet_new_side_data(pkt, AV_PKT_DATA_PRFT,
2028                                                                   sizeof(AVProducerReferenceTime));
2029         if (!prft)
2030             return AVERROR(ENOMEM);
2031         prft->wallclock = av_gettime();
2032         prft->flags = 24;
2033     }
2034     if (os->first_pts == AV_NOPTS_VALUE) {
2035         os->producer_reference_time = *prft;
2036         if (c->target_latency_refid < 0)
2037             c->target_latency_refid = pkt->stream_index;
2038     }
2039
2040     return 0;
2041 }
2042
2043 static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)
2044 {
2045     DASHContext *c = s->priv_data;
2046     AVStream *st = s->streams[pkt->stream_index];
2047     OutputStream *os = &c->streams[pkt->stream_index];
2048     AdaptationSet *as = &c->as[os->as_idx - 1];
2049     int64_t seg_end_duration, elapsed_duration;
2050     int ret;
2051
2052     ret = update_stream_extradata(s, os, pkt, &st->avg_frame_rate);
2053     if (ret < 0)
2054         return ret;
2055
2056     // Fill in a heuristic guess of the packet duration, if none is available.
2057     // The mp4 muxer will do something similar (for the last packet in a fragment)
2058     // if nothing is set (setting it for the other packets doesn't hurt).
2059     // By setting a nonzero duration here, we can be sure that the mp4 muxer won't
2060     // invoke its heuristic (this doesn't have to be identical to that algorithm),
2061     // so that we know the exact timestamps of fragments.
2062     if (!pkt->duration && os->last_dts != AV_NOPTS_VALUE)
2063         pkt->duration = pkt->dts - os->last_dts;
2064     os->last_dts = pkt->dts;
2065
2066     // If forcing the stream to start at 0, the mp4 muxer will set the start
2067     // timestamps to 0. Do the same here, to avoid mismatches in duration/timestamps.
2068     if (os->first_pts == AV_NOPTS_VALUE &&
2069         s->avoid_negative_ts == AVFMT_AVOID_NEG_TS_MAKE_ZERO) {
2070         pkt->pts -= pkt->dts;
2071         pkt->dts  = 0;
2072     }
2073
2074     if (c->write_prft) {
2075         ret = dash_parse_prft(c, pkt);
2076         if (ret < 0)
2077             return ret;
2078     }
2079
2080     if (os->first_pts == AV_NOPTS_VALUE) {
2081         os->first_pts = pkt->pts;
2082     }
2083     os->last_pts = pkt->pts;
2084
2085     if (!c->availability_start_time[0]) {
2086         int64_t start_time_us = av_gettime();
2087         c->start_time_s = start_time_us / 1000000;
2088         format_date(c->availability_start_time,
2089                     sizeof(c->availability_start_time), start_time_us);
2090     }
2091
2092     if (!os->packets_written)
2093         os->availability_time_offset = 0;
2094
2095     if (!os->availability_time_offset &&
2096         ((os->frag_type == FRAG_TYPE_DURATION && os->seg_duration != os->frag_duration) ||
2097          (os->frag_type == FRAG_TYPE_EVERY_FRAME && pkt->duration))) {
2098         AdaptationSet *as = &c->as[os->as_idx - 1];
2099         int64_t frame_duration = 0;
2100
2101         switch (os->frag_type) {
2102         case FRAG_TYPE_DURATION:
2103             frame_duration = os->frag_duration;
2104             break;
2105         case FRAG_TYPE_EVERY_FRAME:
2106             frame_duration = av_rescale_q(pkt->duration, st->time_base, AV_TIME_BASE_Q);
2107             break;
2108         }
2109
2110          os->availability_time_offset = ((double) os->seg_duration -
2111                                          frame_duration) / AV_TIME_BASE;
2112         as->max_frag_duration = FFMAX(frame_duration, as->max_frag_duration);
2113     }
2114
2115     if (c->use_template && !c->use_timeline) {
2116         elapsed_duration = pkt->pts - os->first_pts;
2117         seg_end_duration = (int64_t) os->segment_index * os->seg_duration;
2118     } else {
2119         elapsed_duration = pkt->pts - os->start_pts;
2120         seg_end_duration = os->seg_duration;
2121     }
2122
2123     if (os->parser &&
2124         (os->frag_type == FRAG_TYPE_PFRAMES ||
2125          as->trick_idx >= 0)) {
2126         // Parse the packets only in scenarios where it's needed
2127         uint8_t *data;
2128         int size;
2129         av_parser_parse2(os->parser, os->parser_avctx,
2130                          &data, &size, pkt->data, pkt->size,
2131                          pkt->pts, pkt->dts, pkt->pos);
2132
2133         os->coding_dependency |= os->parser->pict_type != AV_PICTURE_TYPE_I;
2134     }
2135
2136     if (pkt->flags & AV_PKT_FLAG_KEY && os->packets_written &&
2137         av_compare_ts(elapsed_duration, st->time_base,
2138                       seg_end_duration, AV_TIME_BASE_Q) >= 0) {
2139         if (!c->has_video || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
2140             c->last_duration = av_rescale_q(pkt->pts - os->start_pts,
2141                     st->time_base,
2142                     AV_TIME_BASE_Q);
2143             c->total_duration = av_rescale_q(pkt->pts - os->first_pts,
2144                     st->time_base,
2145                     AV_TIME_BASE_Q);
2146
2147             if ((!c->use_timeline || !c->use_template) && os->last_duration) {
2148                 if (c->last_duration < os->last_duration*9/10 ||
2149                         c->last_duration > os->last_duration*11/10) {
2150                     av_log(s, AV_LOG_WARNING,
2151                             "Segment durations differ too much, enable use_timeline "
2152                             "and use_template, or keep a stricter keyframe interval\n");
2153                 }
2154             }
2155         }
2156
2157         if (c->write_prft && os->producer_reference_time.wallclock && !os->producer_reference_time_str[0])
2158             format_date(os->producer_reference_time_str,
2159                         sizeof(os->producer_reference_time_str),
2160                         os->producer_reference_time.wallclock);
2161
2162         if ((ret = dash_flush(s, 0, pkt->stream_index)) < 0)
2163             return ret;
2164     }
2165
2166     if (!os->packets_written) {
2167         // If we wrote a previous segment, adjust the start time of the segment
2168         // to the end of the previous one (which is the same as the mp4 muxer
2169         // does). This avoids gaps in the timeline.
2170         if (os->max_pts != AV_NOPTS_VALUE)
2171             os->start_pts = os->max_pts;
2172         else
2173             os->start_pts = pkt->pts;
2174     }
2175     if (os->max_pts == AV_NOPTS_VALUE)
2176         os->max_pts = pkt->pts + pkt->duration;
2177     else
2178         os->max_pts = FFMAX(os->max_pts, pkt->pts + pkt->duration);
2179
2180     if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
2181         os->frag_type == FRAG_TYPE_PFRAMES &&
2182         os->packets_written) {
2183         av_assert0(os->parser);
2184         if ((os->parser->pict_type == AV_PICTURE_TYPE_P &&
2185              st->codecpar->video_delay &&
2186              !(os->last_flags & AV_PKT_FLAG_KEY)) ||
2187             pkt->flags & AV_PKT_FLAG_KEY) {
2188             ret = av_write_frame(os->ctx, NULL);
2189             if (ret < 0)
2190                 return ret;
2191
2192             if (!os->availability_time_offset) {
2193                 int64_t frag_duration = av_rescale_q(os->total_pkt_duration, st->time_base,
2194                                                      AV_TIME_BASE_Q);
2195                 os->availability_time_offset = ((double) os->seg_duration -
2196                                                  frag_duration) / AV_TIME_BASE;
2197                as->max_frag_duration = FFMAX(frag_duration, as->max_frag_duration);
2198             }
2199         }
2200     }
2201
2202     if (pkt->flags & AV_PKT_FLAG_KEY && (os->packets_written || os->nb_segments) && !os->gop_size && as->trick_idx < 0) {
2203         os->gop_size = os->last_duration + av_rescale_q(os->total_pkt_duration, st->time_base, AV_TIME_BASE_Q);
2204         c->max_gop_size = FFMAX(c->max_gop_size, os->gop_size);
2205     }
2206
2207     if ((ret = ff_write_chained(os->ctx, 0, pkt, s, 0)) < 0)
2208         return ret;
2209
2210     os->packets_written++;
2211     os->total_pkt_size += pkt->size;
2212     os->total_pkt_duration += pkt->duration;
2213     os->last_flags = pkt->flags;
2214
2215     if (!os->init_range_length)
2216         flush_init_segment(s, os);
2217
2218     //open the output context when the first frame of a segment is ready
2219     if (!c->single_file && os->packets_written == 1) {
2220         AVDictionary *opts = NULL;
2221         const char *proto = avio_find_protocol_name(s->url);
2222         int use_rename = proto && !strcmp(proto, "file");
2223         if (os->segment_type == SEGMENT_TYPE_MP4)
2224             write_styp(os->ctx->pb);
2225         os->filename[0] = os->full_path[0] = os->temp_path[0] = '\0';
2226         ff_dash_fill_tmpl_params(os->filename, sizeof(os->filename),
2227                                  os->media_seg_name, pkt->stream_index,
2228                                  os->segment_index, os->bit_rate, os->start_pts);
2229         snprintf(os->full_path, sizeof(os->full_path), "%s%s", c->dirname,
2230                  os->filename);
2231         snprintf(os->temp_path, sizeof(os->temp_path),
2232                  use_rename ? "%s.tmp" : "%s", os->full_path);
2233         set_http_options(&opts, c);
2234         ret = dashenc_io_open(s, &os->out, os->temp_path, &opts);
2235         av_dict_free(&opts);
2236         if (ret < 0) {
2237             return handle_io_open_error(s, ret, os->temp_path);
2238         }
2239         if (c->lhls) {
2240             char *prefetch_url = use_rename ? NULL : os->filename;
2241             write_hls_media_playlist(os, s, pkt->stream_index, 0, prefetch_url);
2242         }
2243     }
2244
2245     //write out the data immediately in streaming mode
2246     if (c->streaming && os->segment_type == SEGMENT_TYPE_MP4) {
2247         int len = 0;
2248         uint8_t *buf = NULL;
2249         avio_flush(os->ctx->pb);
2250         len = avio_get_dyn_buf (os->ctx->pb, &buf);
2251         if (os->out) {
2252             avio_write(os->out, buf + os->written_len, len - os->written_len);
2253             avio_flush(os->out);
2254         }
2255         os->written_len = len;
2256     }
2257
2258     return ret;
2259 }
2260
2261 static int dash_write_trailer(AVFormatContext *s)
2262 {
2263     DASHContext *c = s->priv_data;
2264     int i;
2265
2266     if (s->nb_streams > 0) {
2267         OutputStream *os = &c->streams[0];
2268         // If no segments have been written so far, try to do a crude
2269         // guess of the segment duration
2270         if (!c->last_duration)
2271             c->last_duration = av_rescale_q(os->max_pts - os->start_pts,
2272                                             s->streams[0]->time_base,
2273                                             AV_TIME_BASE_Q);
2274         c->total_duration = av_rescale_q(os->max_pts - os->first_pts,
2275                                          s->streams[0]->time_base,
2276                                          AV_TIME_BASE_Q);
2277     }
2278     dash_flush(s, 1, -1);
2279
2280     if (c->remove_at_exit) {
2281         for (i = 0; i < s->nb_streams; ++i) {
2282             OutputStream *os = &c->streams[i];
2283             dashenc_delete_media_segments(s, os, os->nb_segments);
2284             dashenc_delete_segment_file(s, os->initfile);
2285             if (c->hls_playlist && os->segment_type == SEGMENT_TYPE_MP4) {
2286                 char filename[1024];
2287                 get_hls_playlist_name(filename, sizeof(filename), c->dirname, i);
2288                 dashenc_delete_file(s, filename);
2289             }
2290         }
2291         dashenc_delete_file(s, s->url);
2292
2293         if (c->hls_playlist && c->master_playlist_created) {
2294             char filename[1024];
2295             snprintf(filename, sizeof(filename), "%smaster.m3u8", c->dirname);
2296             dashenc_delete_file(s, filename);
2297         }
2298     }
2299
2300     return 0;
2301 }
2302
2303 static int dash_check_bitstream(struct AVFormatContext *s, const AVPacket *avpkt)
2304 {
2305     DASHContext *c = s->priv_data;
2306     OutputStream *os = &c->streams[avpkt->stream_index];
2307     AVFormatContext *oc = os->ctx;
2308     if (oc->oformat->check_bitstream) {
2309         int ret;
2310         AVPacket pkt = *avpkt;
2311         pkt.stream_index = 0;
2312         ret = oc->oformat->check_bitstream(oc, &pkt);
2313         if (ret == 1) {
2314             AVStream *st = s->streams[avpkt->stream_index];
2315             AVStream *ost = oc->streams[0];
2316             st->internal->bsfc = ost->internal->bsfc;
2317             ost->internal->bsfc = NULL;
2318         }
2319         return ret;
2320     }
2321     return 1;
2322 }
2323
2324 #define OFFSET(x) offsetof(DASHContext, x)
2325 #define E AV_OPT_FLAG_ENCODING_PARAM
2326 static const AVOption options[] = {
2327     { "adaptation_sets", "Adaptation sets. Syntax: id=0,streams=0,1,2 id=1,streams=3,4 and so on", OFFSET(adaptation_sets), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
2328     { "window_size", "number of segments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
2329     { "extra_window_size", "number of segments kept outside of the manifest before removing from disk", OFFSET(extra_window_size), AV_OPT_TYPE_INT, { .i64 = 5 }, 0, INT_MAX, E },
2330 #if FF_API_DASH_MIN_SEG_DURATION
2331     { "min_seg_duration", "minimum segment duration (in microseconds) (will be deprecated)", OFFSET(min_seg_duration), AV_OPT_TYPE_INT, { .i64 = 5000000 }, 0, INT_MAX, E },
2332 #endif
2333     { "seg_duration", "segment duration (in seconds, fractional value can be set)", OFFSET(seg_duration), AV_OPT_TYPE_DURATION, { .i64 = 5000000 }, 0, INT_MAX, E },
2334     { "frag_duration", "fragment duration (in seconds, fractional value can be set)", OFFSET(frag_duration), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT_MAX, E },
2335     { "frag_type", "set type of interval for fragments", OFFSET(frag_type), AV_OPT_TYPE_INT, {.i64 = FRAG_TYPE_NONE }, 0, FRAG_TYPE_NB - 1, E, "frag_type"},
2336     { "none", "one fragment per segment", 0, AV_OPT_TYPE_CONST, {.i64 = FRAG_TYPE_NONE }, 0, UINT_MAX, E, "frag_type"},
2337     { "every_frame", "fragment at every frame", 0, AV_OPT_TYPE_CONST, {.i64 = FRAG_TYPE_EVERY_FRAME }, 0, UINT_MAX, E, "frag_type"},
2338     { "duration", "fragment at specific time intervals", 0, AV_OPT_TYPE_CONST, {.i64 = FRAG_TYPE_DURATION }, 0, UINT_MAX, E, "frag_type"},
2339     { "pframes", "fragment at keyframes and following P-Frame reordering (Video only, experimental)", 0, AV_OPT_TYPE_CONST, {.i64 = FRAG_TYPE_PFRAMES }, 0, UINT_MAX, E, "frag_type"},
2340     { "remove_at_exit", "remove all segments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
2341     { "use_template", "Use SegmentTemplate instead of SegmentList", OFFSET(use_template), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },
2342     { "use_timeline", "Use SegmentTimeline in SegmentTemplate", OFFSET(use_timeline), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },
2343     { "single_file", "Store all segments in one file, accessed using byte ranges", OFFSET(single_file), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
2344     { "single_file_name", "DASH-templated name to be used for baseURL. Implies storing all segments in one file, accessed using byte ranges", OFFSET(single_file_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
2345     { "init_seg_name", "DASH-templated name to used for the initialization segment", OFFSET(init_seg_name), AV_OPT_TYPE_STRING, {.str = "init-stream$RepresentationID$.$ext$"}, 0, 0, E },
2346     { "media_seg_name", "DASH-templated name to used for the media segments", OFFSET(media_seg_name), AV_OPT_TYPE_STRING, {.str = "chunk-stream$RepresentationID$-$Number%05d$.$ext$"}, 0, 0, E },
2347     { "utc_timing_url", "URL of the page that will return the UTC timestamp in ISO format", OFFSET(utc_timing_url), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
2348     { "method", "set the HTTP method", OFFSET(method), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
2349     { "http_user_agent", "override User-Agent field in HTTP header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
2350     { "http_persistent", "Use persistent HTTP connections", OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
2351     { "hls_playlist", "Generate HLS playlist files(master.m3u8, media_%d.m3u8)", OFFSET(hls_playlist), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
2352     { "streaming", "Enable/Disable streaming mode of output. Each frame will be moof fragment", OFFSET(streaming), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
2353     { "timeout", "set timeout for socket I/O operations", OFFSET(timeout), AV_OPT_TYPE_DURATION, { .i64 = -1 }, -1, INT_MAX, .flags = E },
2354     { "index_correction", "Enable/Disable segment index correction logic", OFFSET(index_correction), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
2355     { "format_options","set list of options for the container format (mp4/webm) used for dash", OFFSET(format_options), AV_OPT_TYPE_DICT, {.str = NULL},  0, 0, E},
2356     { "global_sidx", "Write global SIDX atom. Applicable only for single file, mp4 output, non-streaming mode", OFFSET(global_sidx), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
2357     { "dash_segment_type", "set dash segment files type", OFFSET(segment_type_option), AV_OPT_TYPE_INT, {.i64 = SEGMENT_TYPE_AUTO }, 0, SEGMENT_TYPE_NB - 1, E, "segment_type"},
2358     { "auto", "select segment file format based on codec", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_TYPE_AUTO }, 0, UINT_MAX,   E, "segment_type"},
2359     { "mp4", "make segment file in ISOBMFF format", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_TYPE_MP4 }, 0, UINT_MAX,   E, "segment_type"},
2360     { "webm", "make segment file in WebM format", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_TYPE_WEBM }, 0, UINT_MAX,   E, "segment_type"},
2361     { "ignore_io_errors", "Ignore IO errors during open and write. Useful for long-duration runs with network output", OFFSET(ignore_io_errors), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
2362     { "lhls", "Enable Low-latency HLS(Experimental). Adds #EXT-X-PREFETCH tag with current segment's URI", OFFSET(lhls), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
2363     { "ldash", "Enable Low-latency dash. Constrains the value of a few elements", OFFSET(ldash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
2364     { "master_m3u8_publish_rate", "Publish master playlist every after this many segment intervals", OFFSET(master_publish_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, UINT_MAX, E},
2365     { "write_prft", "Write producer reference time element", OFFSET(write_prft), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, E},
2366     { "mpd_profile", "Set profiles. Elements and values used in the manifest may be constrained by them", OFFSET(profile), AV_OPT_TYPE_FLAGS, {.i64 = MPD_PROFILE_DASH }, 0, UINT_MAX, E, "mpd_profile"},
2367     { "dash", "MPEG-DASH ISO Base media file format live profile", 0, AV_OPT_TYPE_CONST, {.i64 = MPD_PROFILE_DASH }, 0, UINT_MAX, E, "mpd_profile"},
2368     { "dvb_dash", "DVB-DASH profile", 0, AV_OPT_TYPE_CONST, {.i64 = MPD_PROFILE_DVB }, 0, UINT_MAX, E, "mpd_profile"},
2369     { "http_opts", "HTTP protocol options", OFFSET(http_opts), AV_OPT_TYPE_DICT, { .str = NULL }, 0, 0, E },
2370     { "target_latency", "Set desired target latency for Low-latency dash", OFFSET(target_latency), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT_MAX, E },
2371     { "min_playback_rate", "Set desired minimum playback rate", OFFSET(min_playback_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 1.0 }, 0.5, 1.5, E },
2372     { "max_playback_rate", "Set desired maximum playback rate", OFFSET(max_playback_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 1.0 }, 0.5, 1.5, E },
2373     { NULL },
2374 };
2375
2376 static const AVClass dash_class = {
2377     .class_name = "dash muxer",
2378     .item_name  = av_default_item_name,
2379     .option     = options,
2380     .version    = LIBAVUTIL_VERSION_INT,
2381 };
2382
2383 AVOutputFormat ff_dash_muxer = {
2384     .name           = "dash",
2385     .long_name      = NULL_IF_CONFIG_SMALL("DASH Muxer"),
2386     .extensions     = "mpd",
2387     .priv_data_size = sizeof(DASHContext),
2388     .audio_codec    = AV_CODEC_ID_AAC,
2389     .video_codec    = AV_CODEC_ID_H264,
2390     .flags          = AVFMT_GLOBALHEADER | AVFMT_NOFILE | AVFMT_TS_NEGATIVE,
2391     .init           = dash_init,
2392     .write_header   = dash_write_header,
2393     .write_packet   = dash_write_packet,
2394     .write_trailer  = dash_write_trailer,
2395     .deinit         = dash_free,
2396     .check_bitstream = dash_check_bitstream,
2397     .priv_class     = &dash_class,
2398 };