libavformat/sierravmd.c

   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 libavformat/sierravmd.c
  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/intreadwrite.h"
  31 #include "avformat.h"
  32
  33 #define VMD_HEADER_SIZE 0x0330
  34 #define BYTES_PER_FRAME_RECORD 16
  35
  36 typedef struct {
  37   int stream_index;
  38   int64_t frame_offset;
  39   unsigned int frame_size;
  40   int64_t pts;
  41   int keyframe;
  42   unsigned char frame_record[BYTES_PER_FRAME_RECORD];
  43 } vmd_frame;
  44
  45 typedef struct VmdDemuxContext {
  46     int video_stream_index;
  47     int audio_stream_index;
  48
  49     unsigned int frame_count;
  50     unsigned int frames_per_block;
  51     vmd_frame *frame_table;
  52     unsigned int current_frame;
  53     int is_indeo3;
  54
  55     int sample_rate;
  56     int64_t audio_sample_counter;
  57     int skiphdr;
  58
  59     unsigned char vmd_header[VMD_HEADER_SIZE];
  60 } VmdDemuxContext;
  61
  62 static int vmd_probe(AVProbeData *p)
  63 {
  64     /* check if the first 2 bytes of the file contain the appropriate size
  65      * of a VMD header chunk */
  66     if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
  67         return 0;
  68
  69     /* only return half certainty since this check is a bit sketchy */
  70     return AVPROBE_SCORE_MAX / 2;
  71 }
  72
  73 static int vmd_read_header(AVFormatContext *s,
  74                            AVFormatParameters *ap)
  75 {
  76     VmdDemuxContext *vmd = s->priv_data;
  77     ByteIOContext *pb = s->pb;
  78     AVStream *st = NULL, *vst;
  79     unsigned int toc_offset;
  80     unsigned char *raw_frame_table;
  81     int raw_frame_table_size;
  82     int64_t current_offset;
  83     int i, j;
  84     unsigned int total_frames;
  85     int64_t current_audio_pts = 0;
  86     unsigned char chunk[BYTES_PER_FRAME_RECORD];
  87     int num, den;
  88     int sound_buffers;
  89
  90     /* fetch the main header, including the 2 header length bytes */
  91     url_fseek(pb, 0, SEEK_SET);
  92     if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
  93         return AVERROR(EIO);
  94
  95     if(vmd->vmd_header[16] == 'i' && vmd->vmd_header[17] == 'v' && vmd->vmd_header[18] == '3')
  96         vmd->is_indeo3 = 1;
  97     else
  98         vmd->is_indeo3 = 0;
  99     /* start up the decoders */
 100     vst = av_new_stream(s, 0);
 101     if (!vst)
 102         return AVERROR(ENOMEM);
 103     av_set_pts_info(vst, 33, 1, 10);
 104     vmd->video_stream_index = vst->index;
 105     vst->codec->codec_type = CODEC_TYPE_VIDEO;
 106     vst->codec->codec_id = vmd->is_indeo3 ? CODEC_ID_INDEO3 : CODEC_ID_VMDVIDEO;
 107     vst->codec->codec_tag = 0;  /* no fourcc */
 108     vst->codec->width = AV_RL16(&vmd->vmd_header[12]);
 109     vst->codec->height = AV_RL16(&vmd->vmd_header[14]);
 110     if(vmd->is_indeo3 && vst->codec->width > 320){
 111         vst->codec->width >>= 1;
 112         vst->codec->height >>= 1;
 113     }
 114     vst->codec->extradata_size = VMD_HEADER_SIZE;
 115     vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
 116     memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
 117
 118     /* if sample rate is 0, assume no audio */
 119     vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
 120     if (vmd->sample_rate) {
 121         st = av_new_stream(s, 0);
 122         if (!st)
 123             return AVERROR(ENOMEM);
 124         vmd->audio_stream_index = st->index;
 125         st->codec->codec_type = CODEC_TYPE_AUDIO;
 126         st->codec->codec_id = CODEC_ID_VMDAUDIO;
 127         st->codec->codec_tag = 0;  /* no fourcc */
 128         st->codec->channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
 129         st->codec->sample_rate = vmd->sample_rate;
 130         st->codec->block_align = AV_RL16(&vmd->vmd_header[806]);
 131         if (st->codec->block_align & 0x8000) {
 132             st->codec->bits_per_coded_sample = 16;
 133             st->codec->block_align = -(st->codec->block_align - 0x10000);
 134         } else {
 135             st->codec->bits_per_coded_sample = 8;
 136         }
 137         st->codec->bit_rate = st->codec->sample_rate *
 138             st->codec->bits_per_coded_sample * st->codec->channels;
 139
 140         /* calculate pts */
 141         num = st->codec->block_align;
 142         den = st->codec->sample_rate * st->codec->channels;
 143         av_reduce(&den, &num, den, num, (1UL<<31)-1);
 144         av_set_pts_info(vst, 33, num, den);
 145         av_set_pts_info(st, 33, num, den);
 146     }
 147
 148     toc_offset = AV_RL32(&vmd->vmd_header[812]);
 149     vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
 150     vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
 151     url_fseek(pb, toc_offset, SEEK_SET);
 152
 153     raw_frame_table = NULL;
 154     vmd->frame_table = NULL;
 155     sound_buffers = AV_RL16(&vmd->vmd_header[808]);
 156     raw_frame_table_size = vmd->frame_count * 6;
 157     if(vmd->frame_count * vmd->frames_per_block  >= UINT_MAX / sizeof(vmd_frame)){
 158         av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
 159         return -1;
 160     }
 161     raw_frame_table = av_malloc(raw_frame_table_size);
 162     vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame));
 163     if (!raw_frame_table || !vmd->frame_table) {
 164         av_free(raw_frame_table);
 165         av_free(vmd->frame_table);
 166         return AVERROR(ENOMEM);
 167     }
 168     if (get_buffer(pb, raw_frame_table, raw_frame_table_size) !=
 169         raw_frame_table_size) {
 170         av_free(raw_frame_table);
 171         av_free(vmd->frame_table);
 172         return AVERROR(EIO);
 173     }
 174
 175     total_frames = 0;
 176     for (i = 0; i < vmd->frame_count; i++) {
 177
 178         current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
 179
 180         /* handle each entry in index block */
 181         for (j = 0; j < vmd->frames_per_block; j++) {
 182             int type;
 183             uint32_t size;
 184
 185             get_buffer(pb, chunk, BYTES_PER_FRAME_RECORD);
 186             type = chunk[0];
 187             size = AV_RL32(&chunk[2]);
 188             if(!size && type != 1)
 189                 continue;
 190             switch(type) {
 191             case 1: /* Audio Chunk */
 192                 if (!st) break;
 193                 /* first audio chunk contains several audio buffers */
 194                 vmd->frame_table[total_frames].frame_offset = current_offset;
 195                 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
 196                 vmd->frame_table[total_frames].frame_size = size;
 197                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
 198                 vmd->frame_table[total_frames].pts = current_audio_pts;
 199                 total_frames++;
 200                 if(!current_audio_pts)
 201                     current_audio_pts += sound_buffers;
 202                 else
 203                     current_audio_pts++;
 204                 break;
 205             case 2: /* Video Chunk */
 206                 vmd->frame_table[total_frames].frame_offset = current_offset;
 207                 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
 208                 vmd->frame_table[total_frames].frame_size = size;
 209                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
 210                 vmd->frame_table[total_frames].pts = i;
 211                 total_frames++;
 212                 break;
 213             }
 214             current_offset += size;
 215         }
 216     }
 217
 218     av_free(raw_frame_table);
 219
 220     vmd->current_frame = 0;
 221     vmd->frame_count = total_frames;
 222
 223     return 0;
 224 }
 225
 226 static int vmd_read_packet(AVFormatContext *s,
 227                            AVPacket *pkt)
 228 {
 229     VmdDemuxContext *vmd = s->priv_data;
 230     ByteIOContext *pb = s->pb;
 231     int ret = 0;
 232     vmd_frame *frame;
 233
 234     if (vmd->current_frame >= vmd->frame_count)
 235         return AVERROR(EIO);
 236
 237     frame = &vmd->frame_table[vmd->current_frame];
 238     /* position the stream (will probably be there already) */
 239     url_fseek(pb, frame->frame_offset, SEEK_SET);
 240
 241     if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
 242         return AVERROR(ENOMEM);
 243     pkt->pos= url_ftell(pb);
 244     memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
 245     if(vmd->is_indeo3)
 246         ret = get_buffer(pb, pkt->data, frame->frame_size);
 247     else
 248         ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD,
 249             frame->frame_size);
 250
 251     if (ret != frame->frame_size) {
 252         av_free_packet(pkt);
 253         ret = AVERROR(EIO);
 254     }
 255     pkt->stream_index = frame->stream_index;
 256     pkt->pts = frame->pts;
 257     av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
 258             (frame->frame_record[0] == 0x02) ? "video" : "audio",
 259             frame->frame_size + BYTES_PER_FRAME_RECORD,
 260             pkt->pts);
 261
 262     vmd->current_frame++;
 263
 264     return ret;
 265 }
 266
 267 static int vmd_read_close(AVFormatContext *s)
 268 {
 269     VmdDemuxContext *vmd = s->priv_data;
 270
 271     av_free(vmd->frame_table);
 272
 273     return 0;
 274 }
 275
 276 AVInputFormat vmd_demuxer = {
 277     "vmd",
 278     NULL_IF_CONFIG_SMALL("Sierra VMD format"),
 279     sizeof(VmdDemuxContext),
 280     vmd_probe,
 281     vmd_read_header,
 282     vmd_read_packet,
 283     vmd_read_close,
 284 };