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/*
* Sierra VMD Format Demuxer
* Copyright (c) 2004 The ffmpeg Project
* |
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* This file is part of FFmpeg.
*
* 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
* 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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* |
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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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* 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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*/
/** |
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* @file |
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* Sierra VMD file demuxer
* by Vladimir "VAG" Gneushev (vagsoft at mail.ru) |
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* for more information on the Sierra VMD file format, visit:
* http://www.pcisys.net/~melanson/codecs/ |
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*/
|
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#include "avio_internal.h" |
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#define VMD_HEADER_SIZE 0x0330
#define BYTES_PER_FRAME_RECORD 16
typedef struct {
int stream_index; |
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int64_t frame_offset; |
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unsigned int frame_size;
int64_t pts;
int keyframe;
unsigned char frame_record[BYTES_PER_FRAME_RECORD]; |
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} vmd_frame; |
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typedef struct VmdDemuxContext {
int video_stream_index;
int audio_stream_index;
unsigned int frame_count; |
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unsigned int frames_per_block; |
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vmd_frame *frame_table; |
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unsigned int current_frame; |
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int is_indeo3; |
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|
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int sample_rate;
int64_t audio_sample_counter; |
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int skiphdr; |
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|
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unsigned char vmd_header[VMD_HEADER_SIZE];
} VmdDemuxContext;
static int vmd_probe(AVProbeData *p)
{ |
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int w, h;
if (p->buf_size < 16)
return 0; |
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/* check if the first 2 bytes of the file contain the appropriate size
* of a VMD header chunk */ |
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if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2) |
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return 0; |
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w = AV_RL16(&p->buf[12]);
h = AV_RL16(&p->buf[14]);
if (!w || w > 2048 || !h || h > 2048)
return 0; |
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/* only return half certainty since this check is a bit sketchy */
return AVPROBE_SCORE_MAX / 2;
}
|
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static int vmd_read_header(AVFormatContext *s) |
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{ |
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VmdDemuxContext *vmd = s->priv_data; |
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AVIOContext *pb = s->pb; |
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AVStream *st = NULL, *vst; |
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unsigned int toc_offset;
unsigned char *raw_frame_table;
int raw_frame_table_size; |
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int64_t current_offset; |
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int i, j; |
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unsigned int total_frames; |
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int64_t current_audio_pts = 0; |
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unsigned char chunk[BYTES_PER_FRAME_RECORD]; |
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int num, den; |
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int sound_buffers; |
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/* fetch the main header, including the 2 header length bytes */ |
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avio_seek(pb, 0, SEEK_SET); |
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if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE) |
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return AVERROR(EIO); |
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|
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if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') |
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vmd->is_indeo3 = 1;
else |
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vmd->is_indeo3 = 0; |
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/* start up the decoders */ |
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vst = avformat_new_stream(s, NULL); |
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if (!vst) |
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return AVERROR(ENOMEM); |
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avpriv_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 = AVMEDIA_TYPE_VIDEO; |
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vst->codec->codec_id = vmd->is_indeo3 ? CODEC_ID_INDEO3 : 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]);
vst->codec->height = AV_RL16(&vmd->vmd_header[14]); |
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if(vmd->is_indeo3 && vst->codec->width > 320){
vst->codec->width >>= 1;
vst->codec->height >>= 1;
} |
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vst->codec->extradata_size = VMD_HEADER_SIZE;
vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
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 = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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vmd->audio_stream_index = st->index; |
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st->codec->codec_type = AVMEDIA_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_coded_sample = 16; |
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st->codec->block_align = -(st->codec->block_align - 0x10000); |
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} else { |
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st->codec->bits_per_coded_sample = 8; |
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} |
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st->codec->bit_rate = st->codec->sample_rate * |
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st->codec->bits_per_coded_sample * st->codec->channels; |
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|
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/* calculate pts */
num = st->codec->block_align;
den = st->codec->sample_rate * st->codec->channels;
av_reduce(&den, &num, den, num, (1UL<<31)-1); |
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avpriv_set_pts_info(vst, 33, num, den);
avpriv_set_pts_info(st, 33, num, den); |
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}
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toc_offset = AV_RL32(&vmd->vmd_header[812]);
vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]); |
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avio_seek(pb, toc_offset, SEEK_SET); |
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raw_frame_table = NULL;
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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if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){ |
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av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
return -1;
} |
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raw_frame_table = av_malloc(raw_frame_table_size); |
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vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame)); |
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if (!raw_frame_table || !vmd->frame_table) {
av_free(raw_frame_table);
av_free(vmd->frame_table); |
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return AVERROR(ENOMEM); |
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} |
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if (avio_read(pb, raw_frame_table, raw_frame_table_size) != |
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raw_frame_table_size) {
av_free(raw_frame_table);
av_free(vmd->frame_table); |
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return AVERROR(EIO); |
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}
|
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total_frames = 0;
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 */
for (j = 0; j < vmd->frames_per_block; j++) {
int type;
uint32_t size;
|
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avio_read(pb, chunk, BYTES_PER_FRAME_RECORD); |
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type = chunk[0]; |
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size = AV_RL32(&chunk[2]); |
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if(!size && type != 1) |
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continue;
switch(type) {
case 1: /* Audio Chunk */ |
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if (!st) break; |
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/* first audio chunk contains several audio buffers */ |
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vmd->frame_table[total_frames].frame_offset = current_offset;
vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
vmd->frame_table[total_frames].frame_size = size;
memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
vmd->frame_table[total_frames].pts = current_audio_pts;
total_frames++; |
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if(!current_audio_pts) |
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current_audio_pts += sound_buffers - 1; |
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else
current_audio_pts++; |
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break;
case 2: /* Video Chunk */
vmd->frame_table[total_frames].frame_offset = current_offset;
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 = i; |
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total_frames++;
break;
}
current_offset += size; |
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}
}
av_free(raw_frame_table);
vmd->current_frame = 0; |
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vmd->frame_count = total_frames; |
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return 0;
}
static int vmd_read_packet(AVFormatContext *s,
AVPacket *pkt)
{ |
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VmdDemuxContext *vmd = s->priv_data; |
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AVIOContext *pb = s->pb; |
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int ret = 0; |
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vmd_frame *frame; |
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if (vmd->current_frame >= vmd->frame_count) |
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return AVERROR(EIO); |
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frame = &vmd->frame_table[vmd->current_frame];
/* position the stream (will probably be there already) */ |
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avio_seek(pb, frame->frame_offset, SEEK_SET); |
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|
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if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
return AVERROR(EIO); |
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if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD)) |
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return AVERROR(ENOMEM); |
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pkt->pos= avio_tell(pb); |
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memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD); |
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if(vmd->is_indeo3 && frame->frame_record[0] == 0x02) |
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ret = avio_read(pb, pkt->data, frame->frame_size); |
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else |
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ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD, |
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frame->frame_size); |
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|
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if (ret != frame->frame_size) {
av_free_packet(pkt); |
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ret = AVERROR(EIO); |
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} |
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pkt->stream_index = frame->stream_index; |
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pkt->pts = frame->pts; |
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av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n", |
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(frame->frame_record[0] == 0x02) ? "video" : "audio",
frame->frame_size + BYTES_PER_FRAME_RECORD, |
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pkt->pts); |
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vmd->current_frame++;
return ret;
}
static int vmd_read_close(AVFormatContext *s)
{ |
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VmdDemuxContext *vmd = s->priv_data; |
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av_free(vmd->frame_table);
return 0;
}
|
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AVInputFormat ff_vmd_demuxer = { |
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.name = "vmd",
.long_name = NULL_IF_CONFIG_SMALL("Sierra VMD format"),
.priv_data_size = sizeof(VmdDemuxContext),
.read_probe = vmd_probe,
.read_header = vmd_read_header,
.read_packet = vmd_read_packet,
.read_close = vmd_read_close, |
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}; |