libavformat/swfdec.c

   1 /*
   2  * Flash Compatible Streaming Format demuxer
   3  * Copyright (c) 2000 Fabrice Bellard
   4  * Copyright (c) 2003 Tinic Uro
   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
  25 #if CONFIG_ZLIB
  26 #include <zlib.h>
  27 #endif
  28
  29 #include "libavutil/avassert.h"
  30 #include "libavutil/channel_layout.h"
  31 #include "libavutil/imgutils.h"
  32 #include "libavutil/internal.h"
  33 #include "libavutil/intreadwrite.h"
  34 #include "libavcodec/get_bits.h"
  35 #include "swf.h"
  36
  37 static const AVCodecTag swf_audio_codec_tags[] = {
  38     { AV_CODEC_ID_PCM_S16LE,  0x00 },
  39     { AV_CODEC_ID_ADPCM_SWF,  0x01 },
  40     { AV_CODEC_ID_MP3,        0x02 },
  41     { AV_CODEC_ID_PCM_S16LE,  0x03 },
  42 //  { AV_CODEC_ID_NELLYMOSER, 0x06 },
  43     { AV_CODEC_ID_NONE,          0 },
  44 };
  45
  46 static int get_swf_tag(AVIOContext *pb, int *len_ptr)
  47 {
  48     int tag, len;
  49
  50     if (avio_feof(pb))
  51         return AVERROR_EOF;
  52
  53     tag = avio_rl16(pb);
  54     len = tag & 0x3f;
  55     tag = tag >> 6;
  56     if (len == 0x3f) {
  57         len = avio_rl32(pb);
  58     }
  59     *len_ptr = len;
  60     return tag;
  61 }
  62
  63
  64 static int swf_probe(AVProbeData *p)
  65 {
  66     GetBitContext gb;
  67     int len, xmin, xmax, ymin, ymax;
  68
  69     if(p->buf_size < 15)
  70         return 0;
  71
  72     /* check file header */
  73     if (   AV_RB24(p->buf) != AV_RB24("CWS")
  74         && AV_RB24(p->buf) != AV_RB24("FWS"))
  75         return 0;
  76
  77     if (   AV_RB24(p->buf) == AV_RB24("CWS")
  78         && p->buf[3] <= 20)
  79         return AVPROBE_SCORE_MAX / 4 + 1;
  80
  81     if (init_get_bits8(&gb, p->buf + 3, p->buf_size - 3) < 0)
  82         return 0;
  83
  84     skip_bits(&gb, 40);
  85     len = get_bits(&gb, 5);
  86     if (!len)
  87         return 0;
  88     xmin = get_bits_long(&gb, len);
  89     xmax = get_bits_long(&gb, len);
  90     ymin = get_bits_long(&gb, len);
  91     ymax = get_bits_long(&gb, len);
  92     if (xmin || ymin || !xmax || !ymax)
  93         return 0;
  94
  95     if (p->buf[3] >= 20 || xmax < 16 || ymax < 16)
  96         return AVPROBE_SCORE_MAX / 4;
  97
  98     return AVPROBE_SCORE_MAX;
  99 }
 100
 101 #if CONFIG_ZLIB
 102 static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
 103 {
 104     AVFormatContext *s = opaque;
 105     SWFContext *swf = s->priv_data;
 106     z_stream *z = &swf->zstream;
 107     int ret;
 108
 109 retry:
 110     if (!z->avail_in) {
 111         int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
 112         if (n < 0)
 113             return n;
 114         z->next_in  = swf->zbuf_in;
 115         z->avail_in = n;
 116     }
 117
 118     z->next_out  = buf;
 119     z->avail_out = buf_size;
 120
 121     ret = inflate(z, Z_NO_FLUSH);
 122     if (ret == Z_STREAM_END)
 123         return AVERROR_EOF;
 124     if (ret != Z_OK)
 125         return AVERROR(EINVAL);
 126
 127     if (buf_size - z->avail_out == 0)
 128         goto retry;
 129
 130     return buf_size - z->avail_out;
 131 }
 132 #endif
 133
 134 static int swf_read_header(AVFormatContext *s)
 135 {
 136     SWFContext *swf = s->priv_data;
 137     AVIOContext *pb = s->pb;
 138     int nbits, len, tag;
 139
 140     tag = avio_rb32(pb) & 0xffffff00;
 141     avio_rl32(pb);
 142
 143     if (tag == MKBETAG('C', 'W', 'S', 0)) {
 144         av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
 145 #if CONFIG_ZLIB
 146         swf->zbuf_in  = av_malloc(ZBUF_SIZE);
 147         swf->zbuf_out = av_malloc(ZBUF_SIZE);
 148         swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s,
 149                                       zlib_refill, NULL, NULL);
 150         if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb)
 151             return AVERROR(ENOMEM);
 152         swf->zpb->seekable = 0;
 153         if (inflateInit(&swf->zstream) != Z_OK) {
 154             av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
 155             return AVERROR(EINVAL);
 156         }
 157         pb = swf->zpb;
 158 #else
 159         av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
 160         return AVERROR(EIO);
 161 #endif
 162     } else if (tag != MKBETAG('F', 'W', 'S', 0))
 163         return AVERROR(EIO);
 164     /* skip rectangle size */
 165     nbits = avio_r8(pb) >> 3;
 166     len = (4 * nbits - 3 + 7) / 8;
 167     avio_skip(pb, len);
 168     swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
 169     avio_rl16(pb); /* frame count */
 170
 171     swf->samples_per_frame = 0;
 172     s->ctx_flags |= AVFMTCTX_NOHEADER;
 173     return 0;
 174 }
 175
 176 static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
 177 {
 178     int sample_rate_code, sample_size_code;
 179     AVStream *ast = avformat_new_stream(s, NULL);
 180     if (!ast)
 181         return NULL;
 182     ast->id = id;
 183     if (info & 1) {
 184         ast->codecpar->channels       = 2;
 185         ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
 186     } else {
 187         ast->codecpar->channels       = 1;
 188         ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
 189     }
 190     ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
 191     ast->codecpar->codec_id   = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
 192     ast->need_parsing = AVSTREAM_PARSE_FULL;
 193     sample_rate_code = info>>2 & 3;
 194     sample_size_code = info>>1 & 1;
 195     if (!sample_size_code && ast->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE)
 196         ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
 197     ast->codecpar->sample_rate = 44100 >> (3 - sample_rate_code);
 198     avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
 199     return ast;
 200 }
 201
 202 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
 203 {
 204     SWFContext *swf = s->priv_data;
 205     AVIOContext *pb = s->pb;
 206     AVStream *vst = NULL, *ast = NULL, *st = 0;
 207     int tag, len, i, frame, v, res;
 208
 209 #if CONFIG_ZLIB
 210     if (swf->zpb)
 211         pb = swf->zpb;
 212 #endif
 213
 214     for(;;) {
 215         uint64_t pos = avio_tell(pb);
 216         tag = get_swf_tag(pb, &len);
 217         if (tag < 0)
 218             return tag;
 219         if (len < 0) {
 220             av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
 221             return AVERROR_INVALIDDATA;
 222         }
 223         if (tag == TAG_VIDEOSTREAM) {
 224             int ch_id = avio_rl16(pb);
 225             len -= 2;
 226
 227             for (i=0; i<s->nb_streams; i++) {
 228                 st = s->streams[i];
 229                 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
 230                     goto skip;
 231             }
 232
 233             avio_rl16(pb);
 234             avio_rl16(pb);
 235             avio_rl16(pb);
 236             avio_r8(pb);
 237             /* Check for FLV1 */
 238             vst = avformat_new_stream(s, NULL);
 239             if (!vst)
 240                 return AVERROR(ENOMEM);
 241             vst->id = ch_id;
 242             vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 243             vst->codecpar->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
 244             avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
 245             len -= 8;
 246         } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
 247             /* streaming found */
 248
 249             for (i=0; i<s->nb_streams; i++) {
 250                 st = s->streams[i];
 251                 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
 252                     goto skip;
 253             }
 254
 255             avio_r8(pb);
 256             v = avio_r8(pb);
 257             swf->samples_per_frame = avio_rl16(pb);
 258             ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
 259             if (!ast)
 260                 return AVERROR(ENOMEM);
 261             len -= 4;
 262         } else if (tag == TAG_DEFINESOUND) {
 263             /* audio stream */
 264             int ch_id = avio_rl16(pb);
 265
 266             for (i=0; i<s->nb_streams; i++) {
 267                 st = s->streams[i];
 268                 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
 269                     goto skip;
 270             }
 271
 272             // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
 273             // these are smaller audio streams in DEFINESOUND tags, but it's technically
 274             // possible they could be huge. Break it up into multiple packets if it's big.
 275             v = avio_r8(pb);
 276             ast = create_new_audio_stream(s, ch_id, v);
 277             if (!ast)
 278                 return AVERROR(ENOMEM);
 279             ast->duration = avio_rl32(pb); // number of samples
 280             if (((v>>4) & 15) == 2) { // MP3 sound data record
 281                 ast->skip_samples = avio_rl16(pb);
 282                 len -= 2;
 283             }
 284             len -= 7;
 285             if ((res = av_get_packet(pb, pkt, len)) < 0)
 286                 return res;
 287             pkt->pos = pos;
 288             pkt->stream_index = ast->index;
 289             return pkt->size;
 290         } else if (tag == TAG_VIDEOFRAME) {
 291             int ch_id = avio_rl16(pb);
 292             len -= 2;
 293             for(i=0; i<s->nb_streams; i++) {
 294                 st = s->streams[i];
 295                 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
 296                     frame = avio_rl16(pb);
 297                     len -= 2;
 298                     if (len <= 0)
 299                         goto skip;
 300                     if ((res = av_get_packet(pb, pkt, len)) < 0)
 301                         return res;
 302                     pkt->pos = pos;
 303                     pkt->pts = frame;
 304                     pkt->stream_index = st->index;
 305                     return pkt->size;
 306                 }
 307             }
 308         } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
 309 #if CONFIG_ZLIB
 310             long out_len;
 311             uint8_t *buf = NULL, *zbuf = NULL, *pal;
 312             uint32_t colormap[AVPALETTE_COUNT] = {0};
 313             const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
 314             const int colormapbpp = 3 + alpha_bmp;
 315             int linesize, colormapsize = 0;
 316
 317             const int ch_id   = avio_rl16(pb);
 318             const int bmp_fmt = avio_r8(pb);
 319             const int width   = avio_rl16(pb);
 320             const int height  = avio_rl16(pb);
 321             int pix_fmt;
 322
 323             len -= 2+1+2+2;
 324
 325             switch (bmp_fmt) {
 326             case 3: // PAL-8
 327                 linesize = width;
 328                 colormapsize = avio_r8(pb) + 1;
 329                 len--;
 330                 break;
 331             case 4: // RGB15
 332                 linesize = width * 2;
 333                 break;
 334             case 5: // RGB24 (0RGB)
 335                 linesize = width * 4;
 336                 break;
 337             default:
 338                 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
 339                 goto bitmap_end_skip;
 340             }
 341
 342             linesize = FFALIGN(linesize, 4);
 343
 344             if (av_image_check_size(width, height, 0, s) < 0 ||
 345                 linesize >= INT_MAX / height ||
 346                 linesize * height >= INT_MAX - colormapsize * colormapbpp) {
 347                 av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
 348                 goto bitmap_end_skip;
 349             }
 350
 351             out_len = colormapsize * colormapbpp + linesize * height;
 352
 353             ff_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
 354                     ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
 355
 356             zbuf = av_malloc(len);
 357             buf  = av_malloc(out_len);
 358             if (!zbuf || !buf) {
 359                 res = AVERROR(ENOMEM);
 360                 goto bitmap_end;
 361             }
 362
 363             len = avio_read(pb, zbuf, len);
 364             if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
 365                 av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
 366                 goto bitmap_end_skip;
 367             }
 368
 369             for (i = 0; i < s->nb_streams; i++) {
 370                 st = s->streams[i];
 371                 if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
 372                     break;
 373             }
 374             if (i == s->nb_streams) {
 375                 vst = avformat_new_stream(s, NULL);
 376                 if (!vst) {
 377                     res = AVERROR(ENOMEM);
 378                     goto bitmap_end;
 379                 }
 380                 vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
 381                 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 382                 vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
 383                 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
 384                 st = vst;
 385             }
 386
 387             if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
 388                 goto bitmap_end;
 389             if (!st->codecpar->width && !st->codecpar->height) {
 390                 st->codecpar->width  = width;
 391                 st->codecpar->height = height;
 392             } else {
 393                 ff_add_param_change(pkt, 0, 0, 0, width, height);
 394             }
 395             pkt->pos = pos;
 396             pkt->stream_index = st->index;
 397
 398             if (linesize * height > pkt->size) {
 399                 res = AVERROR_INVALIDDATA;
 400                 av_packet_unref(pkt);
 401                 goto bitmap_end;
 402             }
 403
 404             switch (bmp_fmt) {
 405             case 3:
 406                 pix_fmt = AV_PIX_FMT_PAL8;
 407                 for (i = 0; i < colormapsize; i++)
 408                     if (alpha_bmp)  colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
 409                     else            colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
 410                 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
 411                 if (!pal) {
 412                     res = AVERROR(ENOMEM);
 413                     goto bitmap_end;
 414                 }
 415                 memcpy(pal, colormap, AVPALETTE_SIZE);
 416                 break;
 417             case 4:
 418                 pix_fmt = AV_PIX_FMT_RGB555;
 419                 break;
 420             case 5:
 421                 pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
 422                 break;
 423             default:
 424                 av_assert0(0);
 425             }
 426             if (st->codecpar->format != AV_PIX_FMT_NONE && st->codecpar->format != pix_fmt) {
 427                 av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");
 428             } else
 429                 st->codecpar->format = pix_fmt;
 430
 431             memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
 432
 433             res = pkt->size;
 434
 435 bitmap_end:
 436             av_freep(&zbuf);
 437             av_freep(&buf);
 438             return res;
 439 bitmap_end_skip:
 440             av_freep(&zbuf);
 441             av_freep(&buf);
 442 #else
 443             av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
 444 #endif
 445         } else if (tag == TAG_STREAMBLOCK) {
 446             for (i = 0; i < s->nb_streams; i++) {
 447                 st = s->streams[i];
 448                 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
 449                     if (st->codecpar->codec_id == AV_CODEC_ID_MP3) {
 450                         avio_skip(pb, 4);
 451                         len -= 4;
 452                         if (len <= 0)
 453                             goto skip;
 454                         if ((res = av_get_packet(pb, pkt, len)) < 0)
 455                             return res;
 456                     } else { // ADPCM, PCM
 457                         if (len <= 0)
 458                             goto skip;
 459                         if ((res = av_get_packet(pb, pkt, len)) < 0)
 460                             return res;
 461                     }
 462                     pkt->pos          = pos;
 463                     pkt->stream_index = st->index;
 464                     return pkt->size;
 465                 }
 466             }
 467         } else if (tag == TAG_JPEG2) {
 468             for (i=0; i<s->nb_streams; i++) {
 469                 st = s->streams[i];
 470                 if (st->codecpar->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
 471                     break;
 472             }
 473             if (i == s->nb_streams) {
 474                 vst = avformat_new_stream(s, NULL);
 475                 if (!vst)
 476                     return AVERROR(ENOMEM);
 477                 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
 478                 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 479                 vst->codecpar->codec_id = AV_CODEC_ID_MJPEG;
 480                 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
 481                 st = vst;
 482             }
 483             avio_rl16(pb); /* BITMAP_ID */
 484             len -= 2;
 485             if (len < 4)
 486                 goto skip;
 487             if ((res = av_new_packet(pkt, len)) < 0)
 488                 return res;
 489             if (avio_read(pb, pkt->data, 4) != 4) {
 490                 av_packet_unref(pkt);
 491                 return AVERROR_INVALIDDATA;
 492             }
 493             if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
 494                 AV_RB32(pkt->data) == 0xffd9ffd8) {
 495                 /* old SWF files containing SOI/EOI as data start */
 496                 /* files created by swink have reversed tag */
 497                 pkt->size -= 4;
 498                 memset(pkt->data+pkt->size, 0, 4);
 499                 res = avio_read(pb, pkt->data, pkt->size);
 500             } else {
 501                 res = avio_read(pb, pkt->data + 4, pkt->size - 4);
 502                 if (res >= 0)
 503                     res += 4;
 504             }
 505             if (res != pkt->size) {
 506                 if (res < 0) {
 507                     av_packet_unref(pkt);
 508                     return res;
 509                 }
 510                 av_shrink_packet(pkt, res);
 511             }
 512
 513             pkt->pos = pos;
 514             pkt->stream_index = st->index;
 515             return pkt->size;
 516         } else {
 517             av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
 518         }
 519     skip:
 520         if(len<0)
 521             av_log(s, AV_LOG_WARNING, "Clipping len %d\n", len);
 522         len = FFMAX(0, len);
 523         avio_skip(pb, len);
 524     }
 525 }
 526
 527 #if CONFIG_ZLIB
 528 static av_cold int swf_read_close(AVFormatContext *avctx)
 529 {
 530     SWFContext *s = avctx->priv_data;
 531     inflateEnd(&s->zstream);
 532     av_freep(&s->zbuf_in);
 533     av_freep(&s->zbuf_out);
 534     av_freep(&s->zpb);
 535     return 0;
 536 }
 537 #endif
 538
 539 AVInputFormat ff_swf_demuxer = {
 540     .name           = "swf",
 541     .long_name      = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
 542     .priv_data_size = sizeof(SWFContext),
 543     .read_probe     = swf_probe,
 544     .read_header    = swf_read_header,
 545     .read_packet    = swf_read_packet,
 546 #if CONFIG_ZLIB
 547     .read_close     = swf_read_close,
 548 #endif
 549 };