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lavc: skip initial silence when requested

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-07-04 22:03:13 +02:00
parent 0f03563d7e
commit 2fe186409b
2 changed files with 23 additions and 0 deletions
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5
libavcodec/internal.h
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@ -84,6 +84,11 @@ typedef struct AVCodecInternal {
unsigned int byte_buffer_size;
void *frame_thread_encoder;
/**
* Number of audio samples to skip at the start of the next decoded frame
*/
int skip_samples;
} AVCodecInternal;
struct AVCodecDefault {

18
libavcodec/utils.c
View File

@ -1627,6 +1627,8 @@ int attribute_align_arg avcodec_decode_audio4(AVCodecContext *avctx,
}
if ((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size) {
uint8_t *side;
int side_size;
// copy to ensure we do not change avpkt
AVPacket tmp = *avpkt;
int did_split = av_packet_split_side_data(&tmp);
@ -1645,6 +1647,22 @@ int attribute_align_arg avcodec_decode_audio4(AVCodecContext *avctx,
frame->sample_rate = avctx->sample_rate;
}
side= av_packet_get_side_data(avctx->pkt, AV_PKT_DATA_SKIP_SAMPLES, &side_size);
if(side && side_size>=10) {
avctx->internal->skip_samples = AV_RL32(side);
}
if (avctx->internal->skip_samples) {
if(frame->nb_samples <= avctx->internal->skip_samples){
*got_frame_ptr = 0;
avctx->internal->skip_samples -= frame->nb_samples;
} else {
av_samples_copy(frame->extended_data, frame->extended_data, 0, avctx->internal->skip_samples,
frame->nb_samples - avctx->internal->skip_samples, avctx->channels, frame->format);
frame->nb_samples -= avctx->internal->skip_samples;
avctx->internal->skip_samples = 0;
}
}
avctx->pkt = NULL;
if (did_split) {
ff_packet_free_side_data(&tmp);