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avcodec/frame_thread_encoder: Stop serializing unreferencing AVFrames 

Currently, the frame-threaded decoding API still supports thread-unsafe
callbacks. If one uses a thread-unsafe get_buffer2() callback,
calls to av_frame_unref() by the decoder are serialized, because
it is presumed that the underlying deallocator is thread-unsafe.

The frame-threaded encoder seems to have been written with this
restriction in mind: It always serializes unreferencing its AVFrames,
although no documentation forces it to do so.

This commit schedules to change this behaviour as soon as thread-unsafe
callbacks are removed. For this reason, the FF_API_THREAD_SAFE_CALLBACKS
define is reused.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-08-25 18:59:58 +02:00
parent 25ea90b733
commit 65f6851448
3 changed files with 22 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
libavcodec/encode.c
View File

@ -190,7 +190,7 @@ int ff_encode_get_frame(AVCodecContext *avctx, AVFrame *frame)
}
int ff_encode_encode_cb(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet)
AVFrame *frame, int *got_packet)
{
const FFCodec *const codec = ffcodec(avctx->codec);
int ret;
@ -227,6 +227,10 @@ int ff_encode_encode_cb(AVCodecContext *avctx, AVPacket *avpkt,
unref:
av_packet_unref(avpkt);
}
#if !FF_API_THREAD_SAFE_CALLBACKS
if (frame)
av_frame_unref(frame);
#endif
return ret;
}
@ -267,8 +271,10 @@ static int encode_simple_internal(AVCodecContext *avctx, AVPacket *avpkt)
ret = ff_thread_video_encode_frame(avctx, avpkt, frame, &got_packet);
else {
ret = ff_encode_encode_cb(avctx, avpkt, frame, &got_packet);
#if FF_API_THREAD_SAFE_CALLBACKS
if (frame)
av_frame_unref(frame);
#endif
}
if (avci->draining && !got_packet)

2
libavcodec/encode.h
View File

@ -76,7 +76,7 @@ int ff_alloc_packet(AVCodecContext *avctx, AVPacket *avpkt, int64_t size);
int ff_encode_preinit(AVCodecContext *avctx);
int ff_encode_encode_cb(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet);
AVFrame *frame, int *got_packet);
/**
* Rescale from sample rate to AVCodecContext.time_base.

14
libavcodec/frame_thread_encoder.c
View File

@ -48,7 +48,9 @@ typedef struct{
typedef struct{
AVCodecContext *parent_avctx;
#if FF_API_THREAD_SAFE_CALLBACKS
pthread_mutex_t buffer_mutex;
#endif
pthread_mutex_t task_fifo_mutex; /* Used to guard (next_)task_index */
pthread_cond_t task_fifo_cond;
@ -68,9 +70,15 @@ typedef struct{
} ThreadContext;
#define OFF(member) offsetof(ThreadContext, member)
#if FF_API_THREAD_SAFE_CALLBACKS
DEFINE_OFFSET_ARRAY(ThreadContext, thread_ctx, pthread_init_cnt,
(OFF(buffer_mutex), OFF(task_fifo_mutex), OFF(finished_task_mutex)),
(OFF(task_fifo_cond), OFF(finished_task_cond)));
#else
DEFINE_OFFSET_ARRAY(ThreadContext, thread_ctx, pthread_init_cnt,
(OFF(task_fifo_mutex), OFF(finished_task_mutex)),
(OFF(task_fifo_cond), OFF(finished_task_cond)));
#endif
#undef OFF
static void * attribute_align_arg worker(void *v){
@ -104,9 +112,11 @@ static void * attribute_align_arg worker(void *v){
pkt = task->outdata;
ret = ff_encode_encode_cb(avctx, pkt, frame, &task->got_packet);
#if FF_API_THREAD_SAFE_CALLBACKS
pthread_mutex_lock(&c->buffer_mutex);
av_frame_unref(frame);
pthread_mutex_unlock(&c->buffer_mutex);
#endif
pthread_mutex_lock(&c->finished_task_mutex);
task->return_code = ret;
task->finished = 1;
@ -114,9 +124,13 @@ static void * attribute_align_arg worker(void *v){
pthread_mutex_unlock(&c->finished_task_mutex);
}
end:
#if FF_API_THREAD_SAFE_CALLBACKS
pthread_mutex_lock(&c->buffer_mutex);
#endif
avcodec_close(avctx);
#if FF_API_THREAD_SAFE_CALLBACKS
pthread_mutex_unlock(&c->buffer_mutex);
#endif
av_freep(&avctx);
return NULL;
}