diff options
| author | Muhammad Faiz <mfcc64@gmail.com> | 2017-05-18 20:10:47 +0700 |
|---|---|---|
| committer | Muhammad Faiz <mfcc64@gmail.com> | 2017-05-20 23:19:46 +0700 |
| commit | fc3a03fcf9cd7eafe7342e2508e6128888efa0bb (patch) | |
| tree | 8d3214ab5511957d354ffeeda7b86f6994db8a1f | |
| parent | f20161d8994399ba86f28e683126ea3b2ea0709b (diff) | |
avfilter: take_samples: do not directly return frame when samples are skipped
Modifying data pointer when skipping samples may make it unaligned.
Workaround for Ticket6349.
This should fix the crash of ticket's testcase and a crash/regression
with avxsynth (reported by Michael Niedermayer).
Also change frame->nb_samples < max to frame->nb_samples <= max.
This improves performance. Benchmark:
./ffmpeg -filter_complex "aevalsrc=0:n=1166,firequalizer=fixed=on" -f null null
old:
25767 decicycles in take_samples, 1023 runs, 1 skips
25422 decicycles in take_samples, 2047 runs, 1 skips
25181 decicycles in take_samples, 4095 runs, 1 skips
24904 decicycles in take_samples, 8191 runs, 1 skips
new:
550 decicycles in take_samples, 1024 runs, 0 skips
548 decicycles in take_samples, 2048 runs, 0 skips
545 decicycles in take_samples, 4096 runs, 0 skips
544 decicycles in take_samples, 8192 runs, 0 skips
Reviewed-by: Nicolas George <george@nsup.org>
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
| -rw-r--r-- | libavfilter/avfilter.c | 8 | ||||
| -rw-r--r-- | libavfilter/framequeue.c | 2 | ||||
| -rw-r--r-- | libavfilter/framequeue.h | 5 |
3 files changed, 14 insertions, 1 deletions
diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c index 08b86b010d..e60b0247bc 100644 --- a/libavfilter/avfilter.c +++ b/libavfilter/avfilter.c @@ -1191,7 +1191,7 @@ static int take_samples(AVFilterLink *link, unsigned min, unsigned max, called with enough samples. */ av_assert1(samples_ready(link, link->min_samples)); frame0 = frame = ff_framequeue_peek(&link->fifo, 0); - if (frame->nb_samples >= min && frame->nb_samples < max) { + if (!link->fifo.samples_skipped && frame->nb_samples >= min && frame->nb_samples <= max) { *rframe = ff_framequeue_take(&link->fifo); return 0; } @@ -1522,6 +1522,12 @@ int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe) *rframe = NULL; if (!ff_inlink_check_available_frame(link)) return 0; + + if (link->fifo.samples_skipped) { + frame = ff_framequeue_peek(&link->fifo, 0); + return ff_inlink_consume_samples(link, frame->nb_samples, frame->nb_samples, rframe); + } + frame = ff_framequeue_take(&link->fifo); consume_update(link, frame); *rframe = frame; diff --git a/libavfilter/framequeue.c b/libavfilter/framequeue.c index 26bfa49967..fed1118975 100644 --- a/libavfilter/framequeue.c +++ b/libavfilter/framequeue.c @@ -107,6 +107,7 @@ AVFrame *ff_framequeue_take(FFFrameQueue *fq) fq->tail &= fq->allocated - 1; fq->total_frames_tail++; fq->total_samples_tail += b->frame->nb_samples; + fq->samples_skipped = 0; check_consistency(fq); return b->frame; } @@ -146,5 +147,6 @@ void ff_framequeue_skip_samples(FFFrameQueue *fq, size_t samples, AVRational tim for (i = 0; i < planes && i < AV_NUM_DATA_POINTERS; i++) b->frame->data[i] = b->frame->extended_data[i]; fq->total_samples_tail += samples; + fq->samples_skipped = 1; ff_framequeue_update_peeked(fq, 0); } diff --git a/libavfilter/framequeue.h b/libavfilter/framequeue.h index 5aa2c725a7..c49d872e85 100644 --- a/libavfilter/framequeue.h +++ b/libavfilter/framequeue.h @@ -100,6 +100,11 @@ typedef struct FFFrameQueue { */ uint64_t total_samples_tail; + /** + * Indicate that samples are skipped + */ + int samples_skipped; + } FFFrameQueue; /** |