libavformat/mvdec.c

   1 /*
   2  * Silicon Graphics Movie demuxer
   3  * Copyright (c) 2012 Peter Ross
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * Silicon Graphics Movie demuxer
  25  */
  26
  27 #include "libavutil/channel_layout.h"
  28 #include "libavutil/eval.h"
  29 #include "libavutil/intreadwrite.h"
  30 #include "libavutil/rational.h"
  31
  32 #include "avformat.h"
  33 #include "internal.h"
  34
  35 typedef struct MvContext {
  36     int nb_video_tracks;
  37     int nb_audio_tracks;
  38
  39     int eof_count;        ///< number of streams that have finished
  40     int stream_index;     ///< current stream index
  41     int frame[2];         ///< frame nb for current stream
  42
  43     int acompression;     ///< compression level for audio stream
  44     int aformat;          ///< audio format
  45 } MvContext;
  46
  47 #define AUDIO_FORMAT_SIGNED 401
  48
  49 static int mv_probe(AVProbeData *p)
  50 {
  51     if (AV_RB32(p->buf) == MKBETAG('M', 'O', 'V', 'I') &&
  52         AV_RB16(p->buf + 4) < 3)
  53         return AVPROBE_SCORE_MAX;
  54     return 0;
  55 }
  56
  57 static char *var_read_string(AVIOContext *pb, int size)
  58 {
  59     int n;
  60     char *str;
  61
  62     if (size < 0 || size == INT_MAX)
  63         return NULL;
  64
  65     str = av_malloc(size + 1);
  66     if (!str)
  67         return NULL;
  68     n = avio_get_str(pb, size, str, size + 1);
  69     if (n < size)
  70         avio_skip(pb, size - n);
  71     return str;
  72 }
  73
  74 static int var_read_int(AVIOContext *pb, int size)
  75 {
  76     int v;
  77     char *s = var_read_string(pb, size);
  78     if (!s)
  79         return 0;
  80     v = strtol(s, NULL, 10);
  81     av_free(s);
  82     return v;
  83 }
  84
  85 static AVRational var_read_float(AVIOContext *pb, int size)
  86 {
  87     AVRational v;
  88     char *s = var_read_string(pb, size);
  89     if (!s)
  90         return (AVRational) { 0, 0 };
  91     v = av_d2q(av_strtod(s, NULL), INT_MAX);
  92     av_free(s);
  93     return v;
  94 }
  95
  96 static void var_read_metadata(AVFormatContext *avctx, const char *tag, int size)
  97 {
  98     char *value = var_read_string(avctx->pb, size);
  99     if (value)
 100         av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
 101 }
 102
 103 static int set_channels(AVFormatContext *avctx, AVStream *st, int channels)
 104 {
 105     if (channels <= 0) {
 106         av_log(avctx, AV_LOG_ERROR, "Channel count %d invalid.\n", channels);
 107         return AVERROR_INVALIDDATA;
 108     }
 109     st->codecpar->channels       = channels;
 110     st->codecpar->channel_layout = (st->codecpar->channels == 1) ? AV_CH_LAYOUT_MONO
 111                                                                  : AV_CH_LAYOUT_STEREO;
 112     return 0;
 113 }
 114
 115 /**
 116  * Parse global variable
 117  * @return < 0 if unknown
 118  */
 119 static int parse_global_var(AVFormatContext *avctx, AVStream *st,
 120                             const char *name, int size)
 121 {
 122     MvContext *mv = avctx->priv_data;
 123     AVIOContext *pb = avctx->pb;
 124     if (!strcmp(name, "__NUM_I_TRACKS")) {
 125         mv->nb_video_tracks = var_read_int(pb, size);
 126     } else if (!strcmp(name, "__NUM_A_TRACKS")) {
 127         mv->nb_audio_tracks = var_read_int(pb, size);
 128     } else if (!strcmp(name, "COMMENT") || !strcmp(name, "TITLE")) {
 129         var_read_metadata(avctx, name, size);
 130     } else if (!strcmp(name, "LOOP_MODE") || !strcmp(name, "NUM_LOOPS") ||
 131                !strcmp(name, "OPTIMIZED")) {
 132         avio_skip(pb, size); // ignore
 133     } else
 134         return AVERROR_INVALIDDATA;
 135
 136     return 0;
 137 }
 138
 139 /**
 140  * Parse audio variable
 141  * @return < 0 if unknown
 142  */
 143 static int parse_audio_var(AVFormatContext *avctx, AVStream *st,
 144                            const char *name, int size)
 145 {
 146     MvContext *mv = avctx->priv_data;
 147     AVIOContext *pb = avctx->pb;
 148     if (!strcmp(name, "__DIR_COUNT")) {
 149         st->nb_frames = var_read_int(pb, size);
 150     } else if (!strcmp(name, "AUDIO_FORMAT")) {
 151         mv->aformat = var_read_int(pb, size);
 152     } else if (!strcmp(name, "COMPRESSION")) {
 153         mv->acompression = var_read_int(pb, size);
 154     } else if (!strcmp(name, "DEFAULT_VOL")) {
 155         var_read_metadata(avctx, name, size);
 156     } else if (!strcmp(name, "NUM_CHANNELS")) {
 157         return set_channels(avctx, st, var_read_int(pb, size));
 158     } else if (!strcmp(name, "SAMPLE_RATE")) {
 159         int sample_rate = var_read_int(pb, size);
 160         if (sample_rate <= 0)
 161             return AVERROR_INVALIDDATA;
 162         st->codecpar->sample_rate = sample_rate;
 163         avpriv_set_pts_info(st, 33, 1, st->codecpar->sample_rate);
 164     } else if (!strcmp(name, "SAMPLE_WIDTH")) {
 165         uint64_t bpc = var_read_int(pb, size) * (uint64_t)8;
 166         if (bpc > 16)
 167             return AVERROR_INVALIDDATA;
 168         st->codecpar->bits_per_coded_sample = bpc;
 169     } else
 170         return AVERROR_INVALIDDATA;
 171
 172     return 0;
 173 }
 174
 175 /**
 176  * Parse video variable
 177  * @return < 0 if unknown
 178  */
 179 static int parse_video_var(AVFormatContext *avctx, AVStream *st,
 180                            const char *name, int size)
 181 {
 182     AVIOContext *pb = avctx->pb;
 183     if (!strcmp(name, "__DIR_COUNT")) {
 184         st->nb_frames = st->duration = var_read_int(pb, size);
 185     } else if (!strcmp(name, "COMPRESSION")) {
 186         char *str = var_read_string(pb, size);
 187         if (!str)
 188             return AVERROR_INVALIDDATA;
 189         if (!strcmp(str, "1")) {
 190             st->codecpar->codec_id = AV_CODEC_ID_MVC1;
 191         } else if (!strcmp(str, "2")) {
 192             st->codecpar->format = AV_PIX_FMT_ABGR;
 193             st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
 194         } else if (!strcmp(str, "3")) {
 195             st->codecpar->codec_id = AV_CODEC_ID_SGIRLE;
 196         } else if (!strcmp(str, "10")) {
 197             st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
 198         } else if (!strcmp(str, "MVC2")) {
 199             st->codecpar->codec_id = AV_CODEC_ID_MVC2;
 200         } else {
 201             avpriv_request_sample(avctx, "Video compression %s", str);
 202         }
 203         av_free(str);
 204     } else if (!strcmp(name, "FPS")) {
 205         AVRational fps = var_read_float(pb, size);
 206         avpriv_set_pts_info(st, 64, fps.den, fps.num);
 207         st->avg_frame_rate = fps;
 208     } else if (!strcmp(name, "HEIGHT")) {
 209         st->codecpar->height = var_read_int(pb, size);
 210     } else if (!strcmp(name, "PIXEL_ASPECT")) {
 211         st->sample_aspect_ratio = var_read_float(pb, size);
 212         av_reduce(&st->sample_aspect_ratio.num, &st->sample_aspect_ratio.den,
 213                   st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
 214                   INT_MAX);
 215     } else if (!strcmp(name, "WIDTH")) {
 216         st->codecpar->width = var_read_int(pb, size);
 217     } else if (!strcmp(name, "ORIENTATION")) {
 218         if (var_read_int(pb, size) == 1101) {
 219             st->codecpar->extradata      = av_strdup("BottomUp");
 220             st->codecpar->extradata_size = 9;
 221         }
 222     } else if (!strcmp(name, "Q_SPATIAL") || !strcmp(name, "Q_TEMPORAL")) {
 223         var_read_metadata(avctx, name, size);
 224     } else if (!strcmp(name, "INTERLACING") || !strcmp(name, "PACKING")) {
 225         avio_skip(pb, size); // ignore
 226     } else
 227         return AVERROR_INVALIDDATA;
 228
 229     return 0;
 230 }
 231
 232 static int read_table(AVFormatContext *avctx, AVStream *st,
 233                        int (*parse)(AVFormatContext *avctx, AVStream *st,
 234                                     const char *name, int size))
 235 {
 236     int count, i;
 237     AVIOContext *pb = avctx->pb;
 238     avio_skip(pb, 4);
 239     count = avio_rb32(pb);
 240     avio_skip(pb, 4);
 241     for (i = 0; i < count; i++) {
 242         char name[17];
 243         int size;
 244         avio_read(pb, name, 16);
 245         name[sizeof(name) - 1] = 0;
 246         size = avio_rb32(pb);
 247         if (size < 0) {
 248             av_log(avctx, AV_LOG_ERROR, "entry size %d is invalid\n", size);
 249             return AVERROR_INVALIDDATA;
 250         }
 251         if (parse(avctx, st, name, size) < 0) {
 252             avpriv_request_sample(avctx, "Variable %s", name);
 253             avio_skip(pb, size);
 254         }
 255     }
 256     return 0;
 257 }
 258
 259 static void read_index(AVIOContext *pb, AVStream *st)
 260 {
 261     uint64_t timestamp = 0;
 262     int i;
 263     for (i = 0; i < st->nb_frames; i++) {
 264         uint32_t pos  = avio_rb32(pb);
 265         uint32_t size = avio_rb32(pb);
 266         avio_skip(pb, 8);
 267         if (avio_feof(pb))
 268             return ;
 269         av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
 270         if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
 271             timestamp += size / (st->codecpar->channels * 2LL);
 272         } else {
 273             timestamp++;
 274         }
 275     }
 276 }
 277
 278 static int mv_read_header(AVFormatContext *avctx)
 279 {
 280     MvContext *mv = avctx->priv_data;
 281     AVIOContext *pb = avctx->pb;
 282     AVStream *ast = NULL, *vst = NULL; //initialization to suppress warning
 283     int version, i;
 284     int ret;
 285
 286     avio_skip(pb, 4);
 287
 288     version = avio_rb16(pb);
 289     if (version == 2) {
 290         uint64_t timestamp;
 291         int v;
 292         avio_skip(pb, 22);
 293
 294         /* allocate audio track first to prevent unnecessary seeking
 295          * (audio packet always precede video packet for a given frame) */
 296         ast = avformat_new_stream(avctx, NULL);
 297         if (!ast)
 298             return AVERROR(ENOMEM);
 299
 300         vst = avformat_new_stream(avctx, NULL);
 301         if (!vst)
 302             return AVERROR(ENOMEM);
 303         avpriv_set_pts_info(vst, 64, 1, 15);
 304         vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 305         vst->avg_frame_rate    = av_inv_q(vst->time_base);
 306         vst->nb_frames         = avio_rb32(pb);
 307         v = avio_rb32(pb);
 308         switch (v) {
 309         case 1:
 310             vst->codecpar->codec_id = AV_CODEC_ID_MVC1;
 311             break;
 312         case 2:
 313             vst->codecpar->format = AV_PIX_FMT_ARGB;
 314             vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
 315             break;
 316         default:
 317             avpriv_request_sample(avctx, "Video compression %i", v);
 318             break;
 319         }
 320         vst->codecpar->codec_tag = 0;
 321         vst->codecpar->width     = avio_rb32(pb);
 322         vst->codecpar->height    = avio_rb32(pb);
 323         avio_skip(pb, 12);
 324
 325         ast->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
 326         ast->nb_frames          = vst->nb_frames;
 327         ast->codecpar->sample_rate = avio_rb32(pb);
 328         avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
 329         if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
 330             return AVERROR_INVALIDDATA;
 331
 332         v = avio_rb32(pb);
 333         if (v == AUDIO_FORMAT_SIGNED) {
 334             ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
 335         } else {
 336             avpriv_request_sample(avctx, "Audio compression (format %i)", v);
 337         }
 338
 339         avio_skip(pb, 12);
 340         var_read_metadata(avctx, "title", 0x80);
 341         var_read_metadata(avctx, "comment", 0x100);
 342         avio_skip(pb, 0x80);
 343
 344         timestamp = 0;
 345         for (i = 0; i < vst->nb_frames; i++) {
 346             uint32_t pos   = avio_rb32(pb);
 347             uint32_t asize = avio_rb32(pb);
 348             uint32_t vsize = avio_rb32(pb);
 349             if (avio_feof(pb))
 350                 return AVERROR_INVALIDDATA;
 351             avio_skip(pb, 8);
 352             av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
 353             av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
 354             timestamp += asize / (ast->codecpar->channels * 2LL);
 355         }
 356     } else if (!version && avio_rb16(pb) == 3) {
 357         avio_skip(pb, 4);
 358
 359         if ((ret = read_table(avctx, NULL, parse_global_var)) < 0)
 360             return ret;
 361
 362         if (mv->nb_audio_tracks < 0  || mv->nb_video_tracks < 0 ||
 363            (mv->nb_audio_tracks == 0 && mv->nb_video_tracks == 0)) {
 364             av_log(avctx, AV_LOG_ERROR, "Stream count is invalid.\n");
 365             return AVERROR_INVALIDDATA;
 366         }
 367
 368         if (mv->nb_audio_tracks > 1) {
 369             avpriv_request_sample(avctx, "Multiple audio streams support");
 370             return AVERROR_PATCHWELCOME;
 371         } else if (mv->nb_audio_tracks) {
 372             ast = avformat_new_stream(avctx, NULL);
 373             if (!ast)
 374                 return AVERROR(ENOMEM);
 375             ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
 376             if ((read_table(avctx, ast, parse_audio_var)) < 0)
 377                 return ret;
 378             if (mv->acompression == 100 &&
 379                 mv->aformat == AUDIO_FORMAT_SIGNED &&
 380                 ast->codecpar->bits_per_coded_sample == 16) {
 381                 ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
 382             } else {
 383                 avpriv_request_sample(avctx,
 384                                       "Audio compression %i (format %i, sr %i)",
 385                                       mv->acompression, mv->aformat,
 386                                       ast->codecpar->bits_per_coded_sample);
 387                 ast->codecpar->codec_id = AV_CODEC_ID_NONE;
 388             }
 389             if (ast->codecpar->channels <= 0) {
 390                 av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
 391                 return AVERROR_INVALIDDATA;
 392             }
 393         }
 394
 395         if (mv->nb_video_tracks > 1) {
 396             avpriv_request_sample(avctx, "Multiple video streams support");
 397             return AVERROR_PATCHWELCOME;
 398         } else if (mv->nb_video_tracks) {
 399             vst = avformat_new_stream(avctx, NULL);
 400             if (!vst)
 401                 return AVERROR(ENOMEM);
 402             vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 403             if ((ret = read_table(avctx, vst, parse_video_var))<0)
 404                 return ret;
 405         }
 406
 407         if (mv->nb_audio_tracks)
 408             read_index(pb, ast);
 409
 410         if (mv->nb_video_tracks)
 411             read_index(pb, vst);
 412     } else {
 413         avpriv_request_sample(avctx, "Version %i", version);
 414         return AVERROR_PATCHWELCOME;
 415     }
 416
 417     return 0;
 418 }
 419
 420 static int mv_read_packet(AVFormatContext *avctx, AVPacket *pkt)
 421 {
 422     MvContext *mv = avctx->priv_data;
 423     AVIOContext *pb = avctx->pb;
 424     AVStream *st = avctx->streams[mv->stream_index];
 425     const AVIndexEntry *index;
 426     int frame = mv->frame[mv->stream_index];
 427     int64_t ret;
 428     uint64_t pos;
 429
 430     if (frame < st->nb_index_entries) {
 431         index = &st->index_entries[frame];
 432         pos   = avio_tell(pb);
 433         if (index->pos > pos)
 434             avio_skip(pb, index->pos - pos);
 435         else if (index->pos < pos) {
 436             if (!pb->seekable)
 437                 return AVERROR(EIO);
 438             ret = avio_seek(pb, index->pos, SEEK_SET);
 439             if (ret < 0)
 440                 return ret;
 441         }
 442         ret = av_get_packet(pb, pkt, index->size);
 443         if (ret < 0)
 444             return ret;
 445
 446         pkt->stream_index = mv->stream_index;
 447         pkt->pts          = index->timestamp;
 448         pkt->flags       |= AV_PKT_FLAG_KEY;
 449
 450         mv->frame[mv->stream_index]++;
 451         mv->eof_count = 0;
 452     } else {
 453         mv->eof_count++;
 454         if (mv->eof_count >= avctx->nb_streams)
 455             return AVERROR_EOF;
 456
 457         // avoid returning 0 without a packet
 458         return AVERROR(EAGAIN);
 459     }
 460
 461     mv->stream_index++;
 462     if (mv->stream_index >= avctx->nb_streams)
 463         mv->stream_index = 0;
 464
 465     return 0;
 466 }
 467
 468 static int mv_read_seek(AVFormatContext *avctx, int stream_index,
 469                         int64_t timestamp, int flags)
 470 {
 471     MvContext *mv = avctx->priv_data;
 472     AVStream *st = avctx->streams[stream_index];
 473     int frame, i;
 474
 475     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
 476         return AVERROR(ENOSYS);
 477
 478     if (!avctx->pb->seekable)
 479         return AVERROR(EIO);
 480
 481     frame = av_index_search_timestamp(st, timestamp, flags);
 482     if (frame < 0)
 483         return AVERROR_INVALIDDATA;
 484
 485     for (i = 0; i < avctx->nb_streams; i++)
 486         mv->frame[i] = frame;
 487     return 0;
 488 }
 489
 490 AVInputFormat ff_mv_demuxer = {
 491     .name           = "mv",
 492     .long_name      = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
 493     .priv_data_size = sizeof(MvContext),
 494     .read_probe     = mv_probe,
 495     .read_header    = mv_read_header,
 496     .read_packet    = mv_read_packet,
 497     .read_seek      = mv_read_seek,
 498 };