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(const 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_EXTENSION + 1;
  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
 133 static av_cold int swf_read_close(AVFormatContext *avctx);
 134 #endif
 135
 136 static int swf_read_header(AVFormatContext *s)
 137 {
 138     SWFContext *swf = s->priv_data;
 139     AVIOContext *pb = s->pb;
 140     int nbits, len, tag;
 141
 142     tag = avio_rb32(pb) & 0xffffff00;
 143     avio_rl32(pb);
 144
 145     if (tag == MKBETAG('C', 'W', 'S', 0)) {
 146         av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
 147 #if CONFIG_ZLIB
 148         if (inflateInit(&swf->zstream) != Z_OK) {
 149             av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
 150             return AVERROR(EINVAL);
 151         }
 152         if (!(swf->zbuf_in  = av_malloc(ZBUF_SIZE)) ||
 153             !(swf->zbuf_out = av_malloc(ZBUF_SIZE)) ||
 154             !(swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0,
 155                                             s, zlib_refill, NULL, NULL))) {
 156             swf_read_close(s);
 157             return AVERROR(ENOMEM);
 158         }
 159         swf->zpb->seekable = 0;
 160         pb = swf->zpb;
 161 #else
 162         av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
 163         return AVERROR(EIO);
 164 #endif
 165     } else if (tag != MKBETAG('F', 'W', 'S', 0))
 166         return AVERROR(EIO);
 167     /* skip rectangle size */
 168     nbits = avio_r8(pb) >> 3;
 169     len = (4 * nbits - 3 + 7) / 8;
 170     avio_skip(pb, len);
 171     swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
 172     avio_rl16(pb); /* frame count */
 173
 174     swf->samples_per_frame = 0;
 175     s->ctx_flags |= AVFMTCTX_NOHEADER;
 176     return 0;
 177 }
 178
 179 static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
 180 {
 181     int sample_rate_code, sample_size_code;
 182     AVStream *ast = avformat_new_stream(s, NULL);
 183     if (!ast)
 184         return NULL;
 185     ast->id = id;
 186     if (info & 1) {
 187         ast->codecpar->channels       = 2;
 188         ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
 189     } else {
 190         ast->codecpar->channels       = 1;
 191         ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
 192     }
 193     ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
 194     ast->codecpar->codec_id   = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
 195     ast->need_parsing = AVSTREAM_PARSE_FULL;
 196     sample_rate_code = info>>2 & 3;
 197     sample_size_code = info>>1 & 1;
 198     if (!sample_size_code && ast->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE)
 199         ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
 200     ast->codecpar->sample_rate = 44100 >> (3 - sample_rate_code);
 201     avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
 202     return ast;
 203 }
 204
 205 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
 206 {
 207     SWFContext *swf = s->priv_data;
 208     AVIOContext *pb = s->pb;
 209     AVStream *vst = NULL, *ast = NULL, *st = 0;
 210     int tag, len, i, frame, v, res;
 211
 212 #if CONFIG_ZLIB
 213     if (swf->zpb)
 214         pb = swf->zpb;
 215 #endif
 216
 217     for(;;) {
 218         uint64_t pos = avio_tell(pb);
 219         tag = get_swf_tag(pb, &len);
 220         if (tag < 0)
 221             return tag;
 222         if (len < 0) {
 223             av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
 224             return AVERROR_INVALIDDATA;
 225         }
 226         if (tag == TAG_VIDEOSTREAM) {
 227             int ch_id = avio_rl16(pb);
 228             len -= 2;
 229
 230             for (i=0; i<s->nb_streams; i++) {
 231                 st = s->streams[i];
 232                 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
 233                     goto skip;
 234             }
 235
 236             avio_rl16(pb);
 237             avio_rl16(pb);
 238             avio_rl16(pb);
 239             avio_r8(pb);
 240             /* Check for FLV1 */
 241             vst = avformat_new_stream(s, NULL);
 242             if (!vst)
 243                 return AVERROR(ENOMEM);
 244             vst->id = ch_id;
 245             vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 246             vst->codecpar->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
 247             avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
 248             len -= 8;
 249         } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
 250             /* streaming found */
 251
 252             for (i=0; i<s->nb_streams; i++) {
 253                 st = s->streams[i];
 254                 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
 255                     goto skip;
 256             }
 257
 258             avio_r8(pb);
 259             v = avio_r8(pb);
 260             swf->samples_per_frame = avio_rl16(pb);
 261             ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
 262             if (!ast)
 263                 return AVERROR(ENOMEM);
 264             len -= 4;
 265         } else if (tag == TAG_DEFINESOUND) {
 266             /* audio stream */
 267             int ch_id = avio_rl16(pb);
 268
 269             for (i=0; i<s->nb_streams; i++) {
 270                 st = s->streams[i];
 271                 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
 272                     goto skip;
 273             }
 274
 275             // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
 276             // these are smaller audio streams in DEFINESOUND tags, but it's technically
 277             // possible they could be huge. Break it up into multiple packets if it's big.
 278             v = avio_r8(pb);
 279             ast = create_new_audio_stream(s, ch_id, v);
 280             if (!ast)
 281                 return AVERROR(ENOMEM);
 282             ast->duration = avio_rl32(pb); // number of samples
 283             if (((v>>4) & 15) == 2) { // MP3 sound data record
 284                 ast->skip_samples = avio_rl16(pb);
 285                 len -= 2;
 286             }
 287             len -= 7;
 288             if ((res = av_get_packet(pb, pkt, len)) < 0)
 289                 return res;
 290             pkt->pos = pos;
 291             pkt->stream_index = ast->index;
 292             return pkt->size;
 293         } else if (tag == TAG_VIDEOFRAME) {
 294             int ch_id = avio_rl16(pb);
 295             len -= 2;
 296             for(i=0; i<s->nb_streams; i++) {
 297                 st = s->streams[i];
 298                 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
 299                     frame = avio_rl16(pb);
 300                     len -= 2;
 301                     if (len <= 0)
 302                         goto skip;
 303                     if ((res = av_get_packet(pb, pkt, len)) < 0)
 304                         return res;
 305                     pkt->pos = pos;
 306                     pkt->pts = frame;
 307                     pkt->stream_index = st->index;
 308                     return pkt->size;
 309                 }
 310             }
 311         } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
 312 #if CONFIG_ZLIB
 313             long out_len;
 314             uint8_t *buf = NULL, *zbuf = NULL, *pal;
 315             uint32_t colormap[AVPALETTE_COUNT] = {0};
 316             const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
 317             const int colormapbpp = 3 + alpha_bmp;
 318             int linesize, colormapsize = 0;
 319
 320             const int ch_id   = avio_rl16(pb);
 321             const int bmp_fmt = avio_r8(pb);
 322             const int width   = avio_rl16(pb);
 323             const int height  = avio_rl16(pb);
 324             int pix_fmt;
 325
 326             len -= 2+1+2+2;
 327
 328             switch (bmp_fmt) {
 329             case 3: // PAL-8
 330                 linesize = width;
 331                 colormapsize = avio_r8(pb) + 1;
 332                 len--;
 333                 break;
 334             case 4: // RGB15
 335                 linesize = width * 2;
 336                 break;
 337             case 5: // RGB24 (0RGB)
 338                 linesize = width * 4;
 339                 break;
 340             default:
 341                 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
 342                 goto bitmap_end_skip;
 343             }
 344
 345             linesize = FFALIGN(linesize, 4);
 346
 347             if (av_image_check_size(width, height, 0, s) < 0 ||
 348                 linesize >= INT_MAX / height ||
 349                 linesize * height >= INT_MAX - colormapsize * colormapbpp) {
 350                 av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
 351                 goto bitmap_end_skip;
 352             }
 353
 354             out_len = colormapsize * colormapbpp + linesize * height;
 355
 356             ff_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
 357                     ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
 358
 359             zbuf = av_malloc(len);
 360             buf  = av_malloc(out_len);
 361             if (!zbuf || !buf) {
 362                 res = AVERROR(ENOMEM);
 363                 goto bitmap_end;
 364             }
 365
 366             len = avio_read(pb, zbuf, len);
 367             if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
 368                 av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
 369                 goto bitmap_end_skip;
 370             }
 371
 372             for (i = 0; i < s->nb_streams; i++) {
 373                 st = s->streams[i];
 374                 if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
 375                     break;
 376             }
 377             if (i == s->nb_streams) {
 378                 vst = avformat_new_stream(s, NULL);
 379                 if (!vst) {
 380                     res = AVERROR(ENOMEM);
 381                     goto bitmap_end;
 382                 }
 383                 vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
 384                 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 385                 vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
 386                 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
 387                 st = vst;
 388             }
 389
 390             if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
 391                 goto bitmap_end;
 392             if (!st->codecpar->width && !st->codecpar->height) {
 393                 st->codecpar->width  = width;
 394                 st->codecpar->height = height;
 395             } else {
 396                 ff_add_param_change(pkt, 0, 0, 0, width, height);
 397             }
 398             pkt->pos = pos;
 399             pkt->stream_index = st->index;
 400
 401             if (linesize * height > pkt->size) {
 402                 res = AVERROR_INVALIDDATA;
 403                 goto bitmap_end;
 404             }
 405
 406             switch (bmp_fmt) {
 407             case 3:
 408                 pix_fmt = AV_PIX_FMT_PAL8;
 409                 for (i = 0; i < colormapsize; i++)
 410                     if (alpha_bmp)  colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
 411                     else            colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
 412                 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
 413                 if (!pal) {
 414                     res = AVERROR(ENOMEM);
 415                     goto bitmap_end;
 416                 }
 417                 memcpy(pal, colormap, AVPALETTE_SIZE);
 418                 break;
 419             case 4:
 420                 pix_fmt = AV_PIX_FMT_RGB555;
 421                 break;
 422             case 5:
 423                 pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
 424                 break;
 425             default:
 426                 av_assert0(0);
 427             }
 428             if (st->codecpar->format != AV_PIX_FMT_NONE && st->codecpar->format != pix_fmt) {
 429                 av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");
 430             } else
 431                 st->codecpar->format = pix_fmt;
 432
 433             memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
 434
 435             res = pkt->size;
 436
 437 bitmap_end:
 438             av_freep(&zbuf);
 439             av_freep(&buf);
 440             return res;
 441 bitmap_end_skip:
 442             av_freep(&zbuf);
 443             av_freep(&buf);
 444 #else
 445             av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
 446 #endif
 447         } else if (tag == TAG_STREAMBLOCK) {
 448             for (i = 0; i < s->nb_streams; i++) {
 449                 st = s->streams[i];
 450                 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
 451                     if (st->codecpar->codec_id == AV_CODEC_ID_MP3) {
 452                         avio_skip(pb, 4);
 453                         len -= 4;
 454                         if (len <= 0)
 455                             goto skip;
 456                         if ((res = av_get_packet(pb, pkt, len)) < 0)
 457                             return res;
 458                     } else { // ADPCM, PCM
 459                         if (len <= 0)
 460                             goto skip;
 461                         if ((res = av_get_packet(pb, pkt, len)) < 0)
 462                             return res;
 463                     }
 464                     pkt->pos          = pos;
 465                     pkt->stream_index = st->index;
 466                     return pkt->size;
 467                 }
 468             }
 469         } else if (tag == TAG_JPEG2) {
 470             for (i=0; i<s->nb_streams; i++) {
 471                 st = s->streams[i];
 472                 if (st->codecpar->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
 473                     break;
 474             }
 475             if (i == s->nb_streams) {
 476                 vst = avformat_new_stream(s, NULL);
 477                 if (!vst)
 478                     return AVERROR(ENOMEM);
 479                 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
 480                 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 481                 vst->codecpar->codec_id = AV_CODEC_ID_MJPEG;
 482                 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
 483                 st = vst;
 484             }
 485             avio_rl16(pb); /* BITMAP_ID */
 486             len -= 2;
 487             if (len < 4)
 488                 goto skip;
 489             if ((res = av_new_packet(pkt, len)) < 0)
 490                 return res;
 491             if (avio_read(pb, pkt->data, 4) != 4) {
 492                 return AVERROR_INVALIDDATA;
 493             }
 494             if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
 495                 AV_RB32(pkt->data) == 0xffd9ffd8) {
 496                 /* old SWF files containing SOI/EOI as data start */
 497                 /* files created by swink have reversed tag */
 498                 pkt->size -= 4;
 499                 memset(pkt->data+pkt->size, 0, 4);
 500                 res = avio_read(pb, pkt->data, pkt->size);
 501             } else {
 502                 res = avio_read(pb, pkt->data + 4, pkt->size - 4);
 503                 if (res >= 0)
 504                     res += 4;
 505             }
 506             if (res != pkt->size) {
 507                 if (res < 0) {
 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     avio_context_free(&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 };