libavformat/avidec.c

   1 /*
   2  * AVI decoder.
   3  * Copyright (c) 2001 Fabrice Bellard.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19 #include "avformat.h"
  20 #include "avi.h"
  21 #include "dv.h"
  22
  23 //#define DEBUG
  24
  25 typedef struct AVIIndex {
  26     unsigned char tag[4];
  27     unsigned int flags, pos, len;
  28     struct AVIIndex *next;
  29 } AVIIndex;
  30
  31 typedef struct {
  32     int64_t  riff_end;
  33     int64_t  movi_end;
  34     offset_t movi_list;
  35     AVIIndex *first, *last;
  36     DVDemuxContext* dv_demux;
  37 } AVIContext;
  38
  39 #ifdef DEBUG
  40 static void print_tag(const char *str, unsigned int tag, int size)
  41 {
  42     printf("%s: tag=%c%c%c%c size=0x%x\n",
  43            str, tag & 0xff,
  44            (tag >> 8) & 0xff,
  45            (tag >> 16) & 0xff,
  46            (tag >> 24) & 0xff,
  47            size);
  48 }
  49 #endif
  50
  51 static int get_riff(AVIContext *avi, ByteIOContext *pb)
  52 {
  53     uint32_t tag;
  54     /* check RIFF header */
  55     tag = get_le32(pb);
  56
  57     if (tag != MKTAG('R', 'I', 'F', 'F'))
  58         return -1;
  59     avi->riff_end = get_le32(pb);   /* RIFF chunk size */
  60     avi->riff_end += url_ftell(pb); /* RIFF chunk end */
  61     tag = get_le32(pb);
  62     if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
  63         return -1;
  64
  65     return 0;
  66 }
  67
  68 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
  69 {
  70     AVIContext *avi = s->priv_data;
  71     ByteIOContext *pb = &s->pb;
  72     uint32_t tag, tag1, handler;
  73     int codec_type, stream_index, frame_period, bit_rate, scale, rate;
  74     unsigned int size, nb_frames;
  75     int i, n;
  76     AVStream *st;
  77     int xan_video = 0;  /* hack to support Xan A/V */
  78
  79     if (get_riff(avi, pb) < 0)
  80         return -1;
  81
  82     /* first list tag */
  83     stream_index = -1;
  84     codec_type = -1;
  85     frame_period = 0;
  86     for(;;) {
  87         if (url_feof(pb))
  88             goto fail;
  89         tag = get_le32(pb);
  90         size = get_le32(pb);
  91 #ifdef DEBUG
  92         print_tag("tag", tag, size);
  93 #endif
  94
  95         switch(tag) {
  96         case MKTAG('L', 'I', 'S', 'T'):
  97             /* ignored, except when start of video packets */
  98             tag1 = get_le32(pb);
  99 #ifdef DEBUG
 100             print_tag("list", tag1, 0);
 101 #endif
 102             if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
 103                 avi->movi_end = url_ftell(pb) + size - 4;
 104 #ifdef DEBUG
 105                 printf("movi end=%Lx\n", avi->movi_end);
 106 #endif
 107                 goto end_of_header;
 108             }
 109             break;
 110         case MKTAG('a', 'v', 'i', 'h'):
 111             /* avi header */
 112             /* using frame_period is bad idea */
 113             frame_period = get_le32(pb);
 114             bit_rate = get_le32(pb) * 8;
 115             url_fskip(pb, 4 * 4);
 116             n = get_le32(pb);
 117             for(i=0;i<n;i++) {
 118                 st = av_new_stream(s, i);
 119                 if (!st)
 120                     goto fail;
 121             }
 122             url_fskip(pb, size - 7 * 4);
 123             break;
 124         case MKTAG('s', 't', 'r', 'h'):
 125             /* stream header */
 126             stream_index++;
 127             tag1 = get_le32(pb);
 128             handler = get_le32(pb); /* codec tag */
 129             switch(tag1) {
 130             case MKTAG('i', 'a', 'v', 's'):
 131             case MKTAG('i', 'v', 'a', 's'):
 132                 /*
 133                  * After some consideration -- I don't think we
 134                  * have to support anything but DV in a type1 AVIs.
 135                  */
 136                 if (s->nb_streams != 1)
 137                     goto fail;
 138
 139                 if (handler != MKTAG('d', 'v', 's', 'd') &&
 140                     handler != MKTAG('d', 'v', 'h', 'd') &&
 141                     handler != MKTAG('d', 'v', 's', 'l'))
 142                    goto fail;
 143
 144                 av_freep(&s->streams[0]->codec.extradata);
 145                 av_freep(&s->streams[0]);
 146                 s->nb_streams = 0;
 147                 avi->dv_demux = dv_init_demux(s);
 148                 if (!avi->dv_demux)
 149                     goto fail;
 150                 stream_index = s->nb_streams - 1;
 151                 url_fskip(pb, size - 8);
 152                 break;
 153             case MKTAG('v', 'i', 'd', 's'):
 154                 codec_type = CODEC_TYPE_VIDEO;
 155
 156                 if (stream_index >= s->nb_streams) {
 157                     url_fskip(pb, size - 8);
 158                     break;
 159                 }
 160
 161                 st = s->streams[stream_index];
 162
 163                 get_le32(pb); /* flags */
 164                 get_le16(pb); /* priority */
 165                 get_le16(pb); /* language */
 166                 get_le32(pb); /* XXX: initial frame ? */
 167                 scale = get_le32(pb); /* scale */
 168                 rate = get_le32(pb); /* rate */
 169
 170                 if(scale && rate){
 171                     st->codec.frame_rate = rate;
 172                     st->codec.frame_rate_base = scale;
 173                 }else if(frame_period){
 174                     st->codec.frame_rate = 1000000;
 175                     st->codec.frame_rate_base = frame_period;
 176                 }else{
 177                     st->codec.frame_rate = 25;
 178                     st->codec.frame_rate_base = 1;
 179                 }
 180                 get_le32(pb); /* start */
 181                 nb_frames = get_le32(pb);
 182                 st->start_time = 0;
 183                 st->duration = (double)nb_frames *
 184                     st->codec.frame_rate_base * AV_TIME_BASE /
 185                     st->codec.frame_rate;
 186
 187                 url_fskip(pb, size - 9 * 4);
 188                 break;
 189             case MKTAG('a', 'u', 'd', 's'):
 190                 {
 191                     unsigned int length, rate;
 192
 193                     codec_type = CODEC_TYPE_AUDIO;
 194
 195                     if (stream_index >= s->nb_streams) {
 196                         url_fskip(pb, size - 8);
 197                         break;
 198                     }
 199                     st = s->streams[stream_index];
 200
 201                     get_le32(pb); /* flags */
 202                     get_le16(pb); /* priority */
 203                     get_le16(pb); /* language */
 204                     get_le32(pb); /* initial frame */
 205                     get_le32(pb); /* scale */
 206                     rate = get_le32(pb);
 207                     get_le32(pb); /* start */
 208                     length = get_le32(pb); /* length, in samples or bytes */
 209                     st->start_time = 0;
 210                     if (rate != 0)
 211                         st->duration = (int64_t)length * AV_TIME_BASE / rate;
 212                     url_fskip(pb, size - 9 * 4);
 213                 }
 214                 break;
 215             default:
 216                 goto fail;
 217             }
 218             break;
 219         case MKTAG('s', 't', 'r', 'f'):
 220             /* stream header */
 221             if (stream_index >= s->nb_streams || avi->dv_demux) {
 222                 url_fskip(pb, size);
 223             } else {
 224                 st = s->streams[stream_index];
 225                 switch(codec_type) {
 226                 case CODEC_TYPE_VIDEO:
 227                     get_le32(pb); /* size */
 228                     st->codec.width = get_le32(pb);
 229                     st->codec.height = get_le32(pb);
 230                     get_le16(pb); /* panes */
 231                     st->codec.bits_per_sample= get_le16(pb); /* depth */
 232                     tag1 = get_le32(pb);
 233                     get_le32(pb); /* ImageSize */
 234                     get_le32(pb); /* XPelsPerMeter */
 235                     get_le32(pb); /* YPelsPerMeter */
 236                     get_le32(pb); /* ClrUsed */
 237                     get_le32(pb); /* ClrImportant */
 238
 239                     st->codec.extradata_size= size - 10*4;
 240                     st->codec.extradata= av_malloc(st->codec.extradata_size);
 241                     get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
 242
 243                     if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly
 244                         get_byte(pb);
 245
 246                     /* Extract palette from extradata if bpp <= 8 */
 247                     /* This code assumes that extradata contains only palette */
 248                     /* This is true for all paletted codecs implemented in ffmpeg */
 249                     if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {
 250                         st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));
 251 #ifdef WORDS_BIGENDIAN
 252                         for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)
 253                             st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);
 254 #else
 255                         memcpy(st->codec.palctrl->palette, st->codec.extradata,
 256                                FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));
 257 #endif
 258                         st->codec.palctrl->palette_changed = 1;
 259                     }
 260
 261 #ifdef DEBUG
 262                     print_tag("video", tag1, 0);
 263 #endif
 264                     st->codec.codec_type = CODEC_TYPE_VIDEO;
 265                     st->codec.codec_tag = tag1;
 266                     st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
 267                     if (st->codec.codec_id == CODEC_ID_XAN_WC4)
 268                         xan_video = 1;
 269 //                    url_fskip(pb, size - 5 * 4);
 270                     break;
 271                 case CODEC_TYPE_AUDIO:
 272                     get_wav_header(pb, &st->codec, size);
 273                     if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
 274                         url_fskip(pb, 1);
 275                     /* special case time: To support Xan DPCM, hardcode
 276                      * the format if Xxan is the video codec */
 277                     if (xan_video)
 278                         st->codec.codec_id = CODEC_ID_XAN_DPCM;
 279                     break;
 280                 default:
 281                     url_fskip(pb, size);
 282                     break;
 283                 }
 284             }
 285             break;
 286         default:
 287             /* skip tag */
 288             size += (size & 1);
 289             url_fskip(pb, size);
 290             break;
 291         }
 292     }
 293  end_of_header:
 294     /* check stream number */
 295     if (stream_index != s->nb_streams - 1) {
 296     fail:
 297         for(i=0;i<s->nb_streams;i++) {
 298             av_freep(&s->streams[i]->codec.extradata);
 299             av_freep(&s->streams[i]);
 300         }
 301         return -1;
 302     }
 303
 304     return 0;
 305 }
 306
 307 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
 308 {
 309     AVIContext *avi = s->priv_data;
 310     ByteIOContext *pb = &s->pb;
 311     int n, d[8], size, i;
 312     void* dstr;
 313
 314     memset(d, -1, sizeof(int)*8);
 315
 316     if (avi->dv_demux) {
 317         size = dv_get_packet(avi->dv_demux, pkt);
 318         if (size >= 0)
 319             return size;
 320     }
 321
 322     for(i=url_ftell(pb); !url_feof(pb); i++) {
 323         int j;
 324
 325         if (i >= avi->movi_end) { /* Let's see if it's an OpenDML AVI */
 326             uint32_t tag, size, tag2;
 327             url_fskip(pb, avi->riff_end - url_ftell(pb));
 328             if (get_riff(avi, pb) < 0)
 329                 return -1;
 330
 331             tag = get_le32(pb);
 332             size = get_le32(pb);
 333             tag2 = get_le32(pb);
 334             if (tag == MKTAG('L','I','S','T') && tag2 == MKTAG('m','o','v','i'))
 335                 avi->movi_end = url_ftell(pb) + size - 4;
 336             else
 337                 return -1;
 338         }
 339
 340         for(j=0; j<7; j++)
 341             d[j]= d[j+1];
 342         d[7]= get_byte(pb);
 343
 344         size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
 345
 346         //parse ix##
 347         n= (d[2] - '0') * 10 + (d[3] - '0');
 348         if(    d[2] >= '0' && d[2] <= '9'
 349             && d[3] >= '0' && d[3] <= '9'
 350             && d[0] == 'i' && d[1] == 'x'
 351             && n < s->nb_streams
 352             && i + size <= avi->movi_end){
 353
 354             url_fskip(pb, size);
 355         }
 356
 357         //parse ##dc/##wb
 358         n= (d[0] - '0') * 10 + (d[1] - '0');
 359         if(    d[0] >= '0' && d[0] <= '9'
 360             && d[1] >= '0' && d[1] <= '9'
 361             && ((d[2] == 'd' && d[3] == 'c') ||
 362                 (d[2] == 'w' && d[3] == 'b') ||
 363                 (d[2] == 'd' && d[3] == 'b') ||
 364                 (d[2] == '_' && d[3] == '_'))
 365             && n < s->nb_streams
 366             && i + size <= avi->movi_end) {
 367
 368             av_new_packet(pkt, size);
 369             get_buffer(pb, pkt->data, size);
 370             if (size & 1) {
 371                 get_byte(pb);
 372                 size++;
 373             }
 374
 375             if (avi->dv_demux) {
 376                 dstr = pkt->destruct;
 377                 size = dv_produce_packet(avi->dv_demux, pkt,
 378                                          pkt->data, pkt->size);
 379                 pkt->destruct = dstr;
 380             } else {
 381                 pkt->stream_index = n;
 382                 pkt->flags |= PKT_FLAG_KEY; // FIXME: We really should read
 383                                             //        index for that
 384             }
 385             return size;
 386         }
 387     }
 388     return -1;
 389 }
 390
 391 static int avi_read_close(AVFormatContext *s)
 392 {
 393     int i;
 394     AVIContext *avi = s->priv_data;
 395
 396     for(i=0;i<s->nb_streams;i++) {
 397         AVStream *st = s->streams[i];
 398 //        av_free(st->priv_data);
 399         av_free(st->codec.extradata);
 400         av_free(st->codec.palctrl);
 401     }
 402
 403     if (avi->dv_demux)
 404         av_free(avi->dv_demux);
 405
 406     return 0;
 407 }
 408
 409 static int avi_probe(AVProbeData *p)
 410 {
 411     /* check file header */
 412     if (p->buf_size <= 32)
 413         return 0;
 414     if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
 415         p->buf[2] == 'F' && p->buf[3] == 'F' &&
 416         p->buf[8] == 'A' && p->buf[9] == 'V' &&
 417         p->buf[10] == 'I' && p->buf[11] == ' ')
 418         return AVPROBE_SCORE_MAX;
 419     else
 420         return 0;
 421 }
 422
 423 static AVInputFormat avi_iformat = {
 424     "avi",
 425     "avi format",
 426     sizeof(AVIContext),
 427     avi_probe,
 428     avi_read_header,
 429     avi_read_packet,
 430     avi_read_close,
 431 };
 432
 433 int avidec_init(void)
 434 {
 435     av_register_input_format(&avi_iformat);
 436     return 0;
 437 }