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lavc: Add a flag in AVPacket to discard packet after decoding. Discard frames after decoding based on the flag. 

Signed-off-by: Sasi Inguva <isasi@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Sasi Inguva 2016-09-15 13:36:16 -07:00 committed by Michael Niedermayer
parent 778af68c70
commit 2dbedc20ce
2 changed files with 20 additions and 1 deletions
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6
libavcodec/avcodec.h
View File

@ -1621,6 +1621,12 @@ typedef struct AVPacket {
} AVPacket;
#define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
#define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
/**
* Flag is used to discard packets which are required to maintain valid
* decoder state but are not required for output and should be dropped
* after decoding.
**/
#define AV_PKT_FLAG_DISCARD 0x0004
enum AVSideDataParamChangeFlags {
AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,

15
libavcodec/utils.c
View File

@ -784,6 +784,12 @@ int ff_init_buffer_info(AVCodecContext *avctx, AVFrame *frame)
}
}
add_metadata_from_side_data(pkt, frame);
if (pkt->flags & AV_PKT_FLAG_DISCARD) {
frame->flags |= AV_FRAME_FLAG_DISCARD;
} else {
frame->flags = (frame->flags & ~AV_FRAME_FLAG_DISCARD);
}
} else {
frame->pkt_pts = AV_NOPTS_VALUE;
av_frame_set_pkt_pos (frame, -1);
@ -2247,7 +2253,9 @@ fail:
if(ret == tmp.size)
ret = avpkt->size;
}
if (picture->flags & AV_FRAME_FLAG_DISCARD) {
*got_picture_ptr = 0;
}
if (*got_picture_ptr) {
if (!avctx->refcounted_frames) {
int err = unrefcount_frame(avci, picture);
@ -2343,6 +2351,11 @@ int attribute_align_arg avcodec_decode_audio4(AVCodecContext *avctx,
frame->sample_rate = avctx->sample_rate;
}
if (frame->flags & AV_FRAME_FLAG_DISCARD) {
*got_frame_ptr = 0;
}
side= av_packet_get_side_data(avctx->internal->pkt, AV_PKT_DATA_SKIP_SAMPLES, &side_size);
if(side && side_size>=10) {
avctx->internal->skip_samples = AV_RL32(side);