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lavc: allow asynchronous decoders to return correct pkt_dts values 

The generic code in utils.c sets the AVFrame.pkt_dts field from the
packet it was supposedly decoded. This does not have to be true for a
fully asynchronous decoder like mmaldec. It could be overwritten with an
incorrect value. Even if the decoder doesn't determine the DTS (but sets
it to AV_NOPTS_VALUE), it's impossible to determine a correct value in
utils.c.

Decoders can now be marked with FF_CODEC_CAP_SETS_PKT_DTS, in which case
utils.c won't overwrite the field. The decoders are expected to set this
field (even if they only set it to AV_NOPTS_VALUE).

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
wm4 2015-09-11 18:36:56 +02:00 committed by Luca Barbato
parent b7ab6e18ee
commit 87a051f976
3 changed files with 10 additions and 2 deletions
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8
libavcodec/internal.h
View File

@ -46,7 +46,13 @@
* all.
*/
#define FF_CODEC_CAP_INIT_CLEANUP (1 << 1)
/**
* Decoders marked with FF_CODEC_CAP_SETS_PKT_DTS want to set
* AVFrame.pkt_dts manually. If the flag is set, utils.c won't overwrite
* this field. If it's unset, utils.c tries to guess the pkt_dts field
* from the input AVPacket.
*/
#define FF_CODEC_CAP_SETS_PKT_DTS (1 << 2)
#ifdef DEBUG
# define ff_dlog(ctx, ...) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__)

1
libavcodec/mmaldec.c
View File

@ -792,6 +792,7 @@ AVCodec ff_h264_mmal_decoder = {
.flush = ffmmal_flush,
.priv_class = &ffmmaldec_class,
.capabilities = AV_CODEC_CAP_DELAY,
.caps_internal = FF_CODEC_CAP_SETS_PKT_DTS,
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MMAL,
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE},

3
libavcodec/utils.c
View File

@ -1482,7 +1482,8 @@ int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *pi
else {
ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
avpkt);
picture->pkt_dts = avpkt->dts;
if (!(avctx->codec->caps_internal & FF_CODEC_CAP_SETS_PKT_DTS))
picture->pkt_dts = avpkt->dts;
/* get_buffer is supposed to set frame parameters */
if (!(avctx->codec->capabilities & AV_CODEC_CAP_DR1)) {
picture->sample_aspect_ratio = avctx->sample_aspect_ratio;