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avcodec/pthread_frame, decode: allow errors to happen on draining

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So, all frames and errors are correctly reported in order.
Also limit the numbers of error during draining to prevent infinite loop.

This fix fate failure with THREADS>=4:
  make fate-h264-attachment-631 THREADS=4
This also reverts a755b725ec.

Suggested-by: wm4, Ronald S. Bultje, Marton Balint
Reviewed-by: w4 <nfxjfg@googlemail.com>
Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
This commit is contained in:
Muhammad Faiz 2017-04-28 17:19:13 +07:00
parent 399c7ab9c6
commit d535e0c140
3 changed files with 29 additions and 10 deletions
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21
libavcodec/decode.c
View File

@ -568,8 +568,24 @@ FF_ENABLE_DEPRECATION_WARNINGS
avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
#endif
if (avctx->internal->draining && !got_frame)
avci->draining_done = 1;
/* do not stop draining when got_frame != 0 or ret < 0 */
if (avctx->internal->draining && !got_frame) {
if (ret < 0) {
/* prevent infinite loop if a decoder wrongly always return error on draining */
/* reasonable nb_errors_max = maximum b frames + thread count */
int nb_errors_max = 20 + (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME ?
avctx->thread_count : 1);
if (avci->nb_draining_errors++ >= nb_errors_max) {
av_log(avctx, AV_LOG_ERROR, "Too many errors when draining, this is a bug. "
"Stop draining and force EOF.\n");
avci->draining_done = 1;
ret = AVERROR_BUG;
}
} else {
avci->draining_done = 1;
}
}
avci->compat_decode_consumed += ret;
@ -1659,6 +1675,7 @@ void avcodec_flush_buffers(AVCodecContext *avctx)
{
avctx->internal->draining = 0;
avctx->internal->draining_done = 0;
avctx->internal->nb_draining_errors = 0;
av_frame_unref(avctx->internal->buffer_frame);
av_frame_unref(avctx->internal->compat_decode_frame);
av_packet_unref(avctx->internal->buffer_pkt);

3
libavcodec/internal.h
View File

@ -200,6 +200,9 @@ typedef struct AVCodecInternal {
int showed_multi_packet_warning;
int skip_samples_multiplier;
/* to prevent infinite loop on errors when draining */
int nb_draining_errors;
} AVCodecInternal;
struct AVCodecDefault {

15
libavcodec/pthread_frame.c
View File

@ -509,8 +509,8 @@ int ff_thread_decode_frame(AVCodecContext *avctx,
/*
* Return the next available frame from the oldest thread.
* If we're at the end of the stream, then we have to skip threads that
* didn't output a frame, because we don't want to accidentally signal
* EOF (avpkt->size == 0 && *got_picture_ptr == 0).
* didn't output a frame/error, because we don't want to accidentally signal
* EOF (avpkt->size == 0 && *got_picture_ptr == 0 && err >= 0).
*/
do {
@ -526,20 +526,19 @@ int ff_thread_decode_frame(AVCodecContext *avctx,
av_frame_move_ref(picture, p->frame);
*got_picture_ptr = p->got_frame;
picture->pkt_dts = p->avpkt.dts;
if (p->result < 0)
err = p->result;
err = p->result;
/*
* A later call with avkpt->size == 0 may loop over all threads,
* including this one, searching for a frame to return before being
* including this one, searching for a frame/error to return before being
* stopped by the "finished != fctx->next_finished" condition.
* Make sure we don't mistakenly return the same frame again.
* Make sure we don't mistakenly return the same frame/error again.
*/
p->got_frame = 0;
p->result = 0;
if (finished >= avctx->thread_count) finished = 0;
} while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
} while (!avpkt->size && !*got_picture_ptr && err >= 0 && finished != fctx->next_finished);
update_context_from_thread(avctx, p->avctx, 1);