Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  1. /*
  2.  * Sierra VMD Format Demuxer
  3.  * Copyright (c) 2004 The ffmpeg Project
  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.  * Sierra VMD file demuxer
  25.  * by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
  26.  * for more information on the Sierra VMD file format, visit:
  27.  *   http://www.pcisys.net/~melanson/codecs/
  28.  */
  29.  
  30. #include "libavutil/channel_layout.h"
  31. #include "libavutil/intreadwrite.h"
  32. #include "avformat.h"
  33. #include "internal.h"
  34. #include "avio_internal.h"
  35.  
  36. #define VMD_HEADER_SIZE 0x0330
  37. #define BYTES_PER_FRAME_RECORD 16
  38.  
  39. typedef struct {
  40.   int stream_index;
  41.   int64_t frame_offset;
  42.   unsigned int frame_size;
  43.   int64_t pts;
  44.   int keyframe;
  45.   unsigned char frame_record[BYTES_PER_FRAME_RECORD];
  46. } vmd_frame;
  47.  
  48. typedef struct VmdDemuxContext {
  49.     int video_stream_index;
  50.     int audio_stream_index;
  51.  
  52.     unsigned int frame_count;
  53.     unsigned int frames_per_block;
  54.     vmd_frame *frame_table;
  55.     unsigned int current_frame;
  56.     int is_indeo3;
  57.  
  58.     int sample_rate;
  59.     int64_t audio_sample_counter;
  60.     int skiphdr;
  61.  
  62.     unsigned char vmd_header[VMD_HEADER_SIZE];
  63. } VmdDemuxContext;
  64.  
  65. static int vmd_probe(AVProbeData *p)
  66. {
  67.     int w, h, sample_rate;
  68.     if (p->buf_size < 806)
  69.         return 0;
  70.     /* check if the first 2 bytes of the file contain the appropriate size
  71.      * of a VMD header chunk */
  72.     if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
  73.         return 0;
  74.     w = AV_RL16(&p->buf[12]);
  75.     h = AV_RL16(&p->buf[14]);
  76.     sample_rate = AV_RL16(&p->buf[804]);
  77.     if ((!w || w > 2048 || !h || h > 2048) &&
  78.         sample_rate != 22050)
  79.         return 0;
  80.  
  81.     /* only return half certainty since this check is a bit sketchy */
  82.     return AVPROBE_SCORE_EXTENSION;
  83. }
  84.  
  85. static int vmd_read_header(AVFormatContext *s)
  86. {
  87.     VmdDemuxContext *vmd = s->priv_data;
  88.     AVIOContext *pb = s->pb;
  89.     AVStream *st = NULL, *vst = NULL;
  90.     unsigned int toc_offset;
  91.     unsigned char *raw_frame_table;
  92.     int raw_frame_table_size;
  93.     int64_t current_offset;
  94.     int i, j, ret;
  95.     int width, height;
  96.     unsigned int total_frames;
  97.     int64_t current_audio_pts = 0;
  98.     unsigned char chunk[BYTES_PER_FRAME_RECORD];
  99.     int num, den;
  100.     int sound_buffers;
  101.  
  102.     /* fetch the main header, including the 2 header length bytes */
  103.     avio_seek(pb, 0, SEEK_SET);
  104.     if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
  105.         return AVERROR(EIO);
  106.  
  107.     width = AV_RL16(&vmd->vmd_header[12]);
  108.     height = AV_RL16(&vmd->vmd_header[14]);
  109.     if (width && height) {
  110.         if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') {
  111.             vmd->is_indeo3 = 1;
  112.         } else {
  113.             vmd->is_indeo3 = 0;
  114.         }
  115.         /* start up the decoders */
  116.         vst = avformat_new_stream(s, NULL);
  117.         if (!vst)
  118.             return AVERROR(ENOMEM);
  119.         avpriv_set_pts_info(vst, 33, 1, 10);
  120.         vmd->video_stream_index = vst->index;
  121.         vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  122.         vst->codec->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
  123.         vst->codec->codec_tag = 0;  /* no fourcc */
  124.         vst->codec->width = width;
  125.         vst->codec->height = height;
  126.         if(vmd->is_indeo3 && vst->codec->width > 320){
  127.             vst->codec->width >>= 1;
  128.             vst->codec->height >>= 1;
  129.         }
  130.         if (ff_alloc_extradata(vst->codec, VMD_HEADER_SIZE))
  131.             return AVERROR(ENOMEM);
  132.         memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
  133.     }
  134.  
  135.     /* if sample rate is 0, assume no audio */
  136.     vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
  137.     if (vmd->sample_rate) {
  138.         st = avformat_new_stream(s, NULL);
  139.         if (!st)
  140.             return AVERROR(ENOMEM);
  141.         vmd->audio_stream_index = st->index;
  142.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  143.         st->codec->codec_id = AV_CODEC_ID_VMDAUDIO;
  144.         st->codec->codec_tag = 0;  /* no fourcc */
  145.         if (vmd->vmd_header[811] & 0x80) {
  146.             st->codec->channels       = 2;
  147.             st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
  148.         } else {
  149.             st->codec->channels       = 1;
  150.             st->codec->channel_layout = AV_CH_LAYOUT_MONO;
  151.         }
  152.         st->codec->sample_rate = vmd->sample_rate;
  153.         st->codec->block_align = AV_RL16(&vmd->vmd_header[806]);
  154.         if (st->codec->block_align & 0x8000) {
  155.             st->codec->bits_per_coded_sample = 16;
  156.             st->codec->block_align = -(st->codec->block_align - 0x10000);
  157.         } else {
  158.             st->codec->bits_per_coded_sample = 8;
  159.         }
  160.         st->codec->bit_rate = st->codec->sample_rate *
  161.             st->codec->bits_per_coded_sample * st->codec->channels;
  162.  
  163.         /* calculate pts */
  164.         num = st->codec->block_align;
  165.         den = st->codec->sample_rate * st->codec->channels;
  166.         av_reduce(&num, &den, num, den, (1UL<<31)-1);
  167.         if (vst)
  168.             avpriv_set_pts_info(vst, 33, num, den);
  169.         avpriv_set_pts_info(st, 33, num, den);
  170.     }
  171.  
  172.     toc_offset = AV_RL32(&vmd->vmd_header[812]);
  173.     vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
  174.     vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
  175.     avio_seek(pb, toc_offset, SEEK_SET);
  176.  
  177.     raw_frame_table = NULL;
  178.     vmd->frame_table = NULL;
  179.     sound_buffers = AV_RL16(&vmd->vmd_header[808]);
  180.     raw_frame_table_size = vmd->frame_count * 6;
  181.     if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
  182.         av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
  183.         return -1;
  184.     }
  185.     raw_frame_table = av_malloc(raw_frame_table_size);
  186.     vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame));
  187.     if (!raw_frame_table || !vmd->frame_table) {
  188.         ret = AVERROR(ENOMEM);
  189.         goto error;
  190.     }
  191.     if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
  192.         raw_frame_table_size) {
  193.         ret = AVERROR(EIO);
  194.         goto error;
  195.     }
  196.  
  197.     total_frames = 0;
  198.     for (i = 0; i < vmd->frame_count; i++) {
  199.  
  200.         current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
  201.  
  202.         /* handle each entry in index block */
  203.         for (j = 0; j < vmd->frames_per_block; j++) {
  204.             int type;
  205.             uint32_t size;
  206.  
  207.             avio_read(pb, chunk, BYTES_PER_FRAME_RECORD);
  208.             type = chunk[0];
  209.             size = AV_RL32(&chunk[2]);
  210.             if (size > INT_MAX / 2) {
  211.                 av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
  212.                 ret = AVERROR_INVALIDDATA;
  213.                 goto error;
  214.             }
  215.             if(!size && type != 1)
  216.                 continue;
  217.             switch(type) {
  218.             case 1: /* Audio Chunk */
  219.                 if (!st) break;
  220.                 /* first audio chunk contains several audio buffers */
  221.                 vmd->frame_table[total_frames].frame_offset = current_offset;
  222.                 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
  223.                 vmd->frame_table[total_frames].frame_size = size;
  224.                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
  225.                 vmd->frame_table[total_frames].pts = current_audio_pts;
  226.                 total_frames++;
  227.                 if(!current_audio_pts)
  228.                     current_audio_pts += sound_buffers - 1;
  229.                 else
  230.                     current_audio_pts++;
  231.                 break;
  232.             case 2: /* Video Chunk */
  233.                 vmd->frame_table[total_frames].frame_offset = current_offset;
  234.                 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
  235.                 vmd->frame_table[total_frames].frame_size = size;
  236.                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
  237.                 vmd->frame_table[total_frames].pts = i;
  238.                 total_frames++;
  239.                 break;
  240.             }
  241.             current_offset += size;
  242.         }
  243.     }
  244.  
  245.     av_free(raw_frame_table);
  246.  
  247.     vmd->current_frame = 0;
  248.     vmd->frame_count = total_frames;
  249.  
  250.     return 0;
  251.  
  252. error:
  253.     av_freep(&raw_frame_table);
  254.     av_freep(&vmd->frame_table);
  255.     return ret;
  256. }
  257.  
  258. static int vmd_read_packet(AVFormatContext *s,
  259.                            AVPacket *pkt)
  260. {
  261.     VmdDemuxContext *vmd = s->priv_data;
  262.     AVIOContext *pb = s->pb;
  263.     int ret = 0;
  264.     vmd_frame *frame;
  265.  
  266.     if (vmd->current_frame >= vmd->frame_count)
  267.         return AVERROR_EOF;
  268.  
  269.     frame = &vmd->frame_table[vmd->current_frame];
  270.     /* position the stream (will probably be there already) */
  271.     avio_seek(pb, frame->frame_offset, SEEK_SET);
  272.  
  273.     if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
  274.         return AVERROR(EIO);
  275.     if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
  276.         return AVERROR(ENOMEM);
  277.     pkt->pos= avio_tell(pb);
  278.     memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
  279.     if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
  280.         ret = avio_read(pb, pkt->data, frame->frame_size);
  281.     else
  282.         ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
  283.             frame->frame_size);
  284.  
  285.     if (ret != frame->frame_size) {
  286.         av_free_packet(pkt);
  287.         ret = AVERROR(EIO);
  288.     }
  289.     pkt->stream_index = frame->stream_index;
  290.     pkt->pts = frame->pts;
  291.     av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
  292.             (frame->frame_record[0] == 0x02) ? "video" : "audio",
  293.             frame->frame_size + BYTES_PER_FRAME_RECORD,
  294.             pkt->pts);
  295.  
  296.     vmd->current_frame++;
  297.  
  298.     return ret;
  299. }
  300.  
  301. static int vmd_read_close(AVFormatContext *s)
  302. {
  303.     VmdDemuxContext *vmd = s->priv_data;
  304.  
  305.     av_freep(&vmd->frame_table);
  306.  
  307.     return 0;
  308. }
  309.  
  310. AVInputFormat ff_vmd_demuxer = {
  311.     .name           = "vmd",
  312.     .long_name      = NULL_IF_CONFIG_SMALL("Sierra VMD"),
  313.     .priv_data_size = sizeof(VmdDemuxContext),
  314.     .read_probe     = vmd_probe,
  315.     .read_header    = vmd_read_header,
  316.     .read_packet    = vmd_read_packet,
  317.     .read_close     = vmd_read_close,
  318. };
  319.