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* Sierra VMD Format Demuxer
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* Copyright (c) 2004 The ffmpeg Project
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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* Sierra VMD file demuxer
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* by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
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* for more information on the Sierra VMD file format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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#define VMD_HEADER_SIZE 0x0330
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#define BYTES_PER_FRAME_RECORD 16
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offset_t frame_offset;
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unsigned int frame_size;
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unsigned char frame_record[BYTES_PER_FRAME_RECORD];
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typedef struct VmdDemuxContext {
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int video_stream_index;
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int audio_stream_index;
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unsigned int frame_count;
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unsigned int frames_per_block;
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vmd_frame_t *frame_table;
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unsigned int current_frame;
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int64_t audio_sample_counter;
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unsigned char vmd_header[VMD_HEADER_SIZE];
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static int vmd_probe(AVProbeData *p)
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/* check if the first 2 bytes of the file contain the appropriate size
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* of a VMD header chunk */
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if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
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/* only return half certainty since this check is a bit sketchy */
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return AVPROBE_SCORE_MAX / 2;
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static int vmd_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
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ByteIOContext *pb = &s->pb;
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unsigned int toc_offset;
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unsigned char *raw_frame_table;
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int raw_frame_table_size;
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offset_t current_offset;
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unsigned int total_frames;
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int64_t current_video_pts = 0, current_audio_pts = 0;
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unsigned char chunk[BYTES_PER_FRAME_RECORD];
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/* fetch the main header, including the 2 header length bytes */
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url_fseek(pb, 0, SEEK_SET);
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if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
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/* start up the decoders */
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vst = av_new_stream(s, 0);
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return AVERROR_NOMEM;
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av_set_pts_info(vst, 33, 1, 10);
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vmd->video_stream_index = vst->index;
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vst->codec->codec_type = CODEC_TYPE_VIDEO;
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vst->codec->codec_id = CODEC_ID_VMDVIDEO;
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vst->codec->codec_tag = 0; /* no fourcc */
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vst->codec->width = AV_RL16(&vmd->vmd_header[12]);
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vst->codec->height = AV_RL16(&vmd->vmd_header[14]);
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vst->codec->extradata_size = VMD_HEADER_SIZE;
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vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
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memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
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/* if sample rate is 0, assume no audio */
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vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
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if (vmd->sample_rate) {
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st = av_new_stream(s, 0);
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return AVERROR_NOMEM;
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vmd->audio_stream_index = st->index;
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st->codec->codec_type = CODEC_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_VMDAUDIO;
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st->codec->codec_tag = 0; /* no fourcc */
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st->codec->channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
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st->codec->sample_rate = vmd->sample_rate;
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st->codec->block_align = AV_RL16(&vmd->vmd_header[806]);
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if (st->codec->block_align & 0x8000) {
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st->codec->bits_per_sample = 16;
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st->codec->block_align = -(st->codec->block_align - 0x10000);
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st->codec->bits_per_sample = 8;
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st->codec->bit_rate = st->codec->sample_rate *
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st->codec->bits_per_sample * st->codec->channels;
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num = st->codec->block_align;
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den = st->codec->sample_rate * st->codec->channels;
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av_reduce(&den, &num, den, num, (1UL<<31)-1);
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av_set_pts_info(vst, 33, num, den);
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av_set_pts_info(st, 33, num, den);
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toc_offset = AV_RL32(&vmd->vmd_header[812]);
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vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
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vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
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url_fseek(pb, toc_offset, SEEK_SET);
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raw_frame_table = NULL;
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vmd->frame_table = NULL;
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sound_buffers = AV_RL16(&vmd->vmd_header[808]);
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raw_frame_table_size = vmd->frame_count * 6;
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raw_frame_table = av_malloc(raw_frame_table_size);
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if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame_t)){
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av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
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vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame_t));
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if (!raw_frame_table || !vmd->frame_table) {
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av_free(raw_frame_table);
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av_free(vmd->frame_table);
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return AVERROR_NOMEM;
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if (get_buffer(pb, raw_frame_table, raw_frame_table_size) !=
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raw_frame_table_size) {
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av_free(raw_frame_table);
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av_free(vmd->frame_table);
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for (i = 0; i < vmd->frame_count; i++) {
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current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
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/* handle each entry in index block */
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for (j = 0; j < vmd->frames_per_block; j++) {
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get_buffer(pb, chunk, BYTES_PER_FRAME_RECORD);
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size = AV_RL32(&chunk[2]);
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case 1: /* Audio Chunk */
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/* first audio chunk contains several audio buffers */
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if(current_audio_pts){
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vmd->frame_table[total_frames].frame_offset = current_offset;
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vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
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vmd->frame_table[total_frames].frame_size = size;
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memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
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vmd->frame_table[total_frames].pts = current_audio_pts;
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current_audio_pts += pts_inc;
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url_fseek(pb, current_offset, SEEK_SET);
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flags = get_le32(pb);
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url_fseek(pb, pos, SEEK_SET);
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av_log(s, AV_LOG_DEBUG, "Sound mapping = %08X (%i bufs)\n", flags, sound_buffers);
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for(k = 0; k < sound_buffers - 1; k++){
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if(flags & 1) { /* silent block */
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vmd->frame_table[total_frames].frame_size = 0;
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vmd->frame_table[total_frames].frame_size = st->codec->block_align + (st->codec->block_align & 1);
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noff += vmd->frame_table[total_frames].frame_size;
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vmd->frame_table[total_frames].frame_offset = current_offset + noff;
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vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
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memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
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vmd->frame_table[total_frames].pts = current_audio_pts;
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current_audio_pts += pts_inc;
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case 2: /* Video Chunk */
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vmd->frame_table[total_frames].frame_offset = current_offset;
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vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
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vmd->frame_table[total_frames].frame_size = size;
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memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
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vmd->frame_table[total_frames].pts = current_video_pts;
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current_offset += size;
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current_video_pts += pts_inc;
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av_free(raw_frame_table);
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vmd->current_frame = 0;
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vmd->frame_count = total_frames;
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static int vmd_read_packet(AVFormatContext *s,
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VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
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ByteIOContext *pb = &s->pb;
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if (vmd->current_frame >= vmd->frame_count)
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frame = &vmd->frame_table[vmd->current_frame];
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/* position the stream (will probably be there already) */
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url_fseek(pb, frame->frame_offset, SEEK_SET);
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if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
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return AVERROR_NOMEM;
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pkt->pos= url_ftell(pb);
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memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
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ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD,
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if (ret != frame->frame_size) {
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pkt->stream_index = frame->stream_index;
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pkt->pts = frame->pts;
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av_log(NULL, AV_LOG_INFO, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
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(frame->frame_record[0] == 0x02) ? "video" : "audio",
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frame->frame_size + BYTES_PER_FRAME_RECORD,
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vmd->current_frame++;
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static int vmd_read_close(AVFormatContext *s)
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VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
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av_free(vmd->frame_table);
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AVInputFormat vmd_demuxer = {
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sizeof(VmdDemuxContext),