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third_party_ffmpeg/libavcodec/pthread_frame.c

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/*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Frame multithreading support functions
* @see doc/multithreading.txt
*/
#include "config.h"
#include <stdint.h>
#if HAVE_PTHREADS
#include <pthread.h>
#elif HAVE_W32THREADS
#include "compat/w32pthreads.h"
#endif
#include "avcodec.h"
#include "internal.h"
#include "pthread_internal.h"
#include "thread.h"
#include "version.h"
#include "libavutil/avassert.h"
#include "libavutil/buffer.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/frame.h"
#include "libavutil/internal.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
/**
* Context used by codec threads and stored in their AVCodecInternal thread_ctx.
*/
typedef struct PerThreadContext {
struct FrameThreadContext *parent;
pthread_t thread;
int thread_init;
pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.
pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.
pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.
AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).
AVFrame *frame; ///< Output frame (for decoding) or input (for encoding).
int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
int result; ///< The result of the last codec decode/encode() call.
enum {
STATE_INPUT_READY, ///< Set when the thread is awaiting a packet.
STATE_SETTING_UP, ///< Set before the codec has called ff_thread_finish_setup().
STATE_GET_BUFFER, /**<
* Set when the codec calls get_buffer().
* State is returned to STATE_SETTING_UP afterwards.
*/
STATE_SETUP_FINISHED ///< Set after the codec has called ff_thread_finish_setup().
} state;
/**
* Array of frames passed to ff_thread_release_buffer().
* Frames are released after all threads referencing them are finished.
*/
AVFrame *released_buffers;
int num_released_buffers;
int released_buffers_allocated;
AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
int requested_flags; ///< flags passed to get_buffer() for requested_frame
} PerThreadContext;
/**
* Context stored in the client AVCodecInternal thread_ctx.
*/
typedef struct FrameThreadContext {
PerThreadContext *threads; ///< The contexts for each thread.
PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
int next_decoding; ///< The next context to submit a packet to.
int next_finished; ///< The next context to return output from.
int delaying; /**<
* Set for the first N packets, where N is the number of threads.
* While it is set, ff_thread_en/decode_frame won't return any results.
*/
int die; ///< Set when threads should exit.
} FrameThreadContext;
/**
* Codec worker thread.
*
* Automatically calls ff_thread_finish_setup() if the codec does
* not provide an update_thread_context method, or if the codec returns
* before calling it.
*/
static attribute_align_arg void *frame_worker_thread(void *arg)
{
PerThreadContext *p = arg;
FrameThreadContext *fctx = p->parent;
AVCodecContext *avctx = p->avctx;
const AVCodec *codec = avctx->codec;
while (1) {
if (p->state == STATE_INPUT_READY && !fctx->die) {
pthread_mutex_lock(&p->mutex);
while (p->state == STATE_INPUT_READY && !fctx->die)
pthread_cond_wait(&p->input_cond, &p->mutex);
pthread_mutex_unlock(&p->mutex);
}
if (fctx->die) break;
if (!codec->update_thread_context && avctx->thread_safe_callbacks)
ff_thread_finish_setup(avctx);
pthread_mutex_lock(&p->mutex);
av_frame_unref(p->frame);
p->got_frame = 0;
p->result = codec->decode(avctx, p->frame, &p->got_frame, &p->avpkt);
if ((p->result < 0 || !p->got_frame) && p->frame->buf[0]) {
if (avctx->internal->allocate_progress)
av_log(avctx, AV_LOG_ERROR, "A frame threaded decoder did not "
"free the frame on failure. This is a bug, please report it.\n");
av_frame_unref(p->frame);
}
if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
p->state = STATE_INPUT_READY;
pthread_mutex_lock(&p->progress_mutex);
pthread_cond_signal(&p->output_cond);
pthread_mutex_unlock(&p->progress_mutex);
pthread_mutex_unlock(&p->mutex);
}
return NULL;
}
/**
* Update the next thread's AVCodecContext with values from the reference thread's context.
*
* @param dst The destination context.
* @param src The source context.
* @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
*/
static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
{
int err = 0;
if (dst != src) {
dst->time_base = src->time_base;
dst->width = src->width;
dst->height = src->height;
dst->pix_fmt = src->pix_fmt;
dst->coded_width = src->coded_width;
dst->coded_height = src->coded_height;
dst->has_b_frames = src->has_b_frames;
dst->idct_algo = src->idct_algo;
dst->bits_per_coded_sample = src->bits_per_coded_sample;
dst->sample_aspect_ratio = src->sample_aspect_ratio;
#if FF_API_AFD
FF_DISABLE_DEPRECATION_WARNINGS
dst->dtg_active_format = src->dtg_active_format;
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_AFD */
dst->profile = src->profile;
dst->level = src->level;
dst->bits_per_raw_sample = src->bits_per_raw_sample;
dst->ticks_per_frame = src->ticks_per_frame;
dst->color_primaries = src->color_primaries;
dst->color_trc = src->color_trc;
dst->colorspace = src->colorspace;
dst->color_range = src->color_range;
dst->chroma_sample_location = src->chroma_sample_location;
dst->hwaccel = src->hwaccel;
dst->hwaccel_context = src->hwaccel_context;
dst->internal->hwaccel_priv_data = src->internal->hwaccel_priv_data;
}
if (for_user) {
dst->coded_frame = src->coded_frame;
} else {
if (dst->codec->update_thread_context)
err = dst->codec->update_thread_context(dst, src);
}
return err;
}
/**
* Update the next thread's AVCodecContext with values set by the user.
*
* @param dst The destination context.
* @param src The source context.
* @return 0 on success, negative error code on failure
*/
static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
{
#define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
dst->flags = src->flags;
dst->draw_horiz_band= src->draw_horiz_band;
dst->get_buffer2 = src->get_buffer2;
#if FF_API_GET_BUFFER
FF_DISABLE_DEPRECATION_WARNINGS
dst->get_buffer = src->get_buffer;
dst->release_buffer = src->release_buffer;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
dst->opaque = src->opaque;
dst->debug = src->debug;
dst->slice_flags = src->slice_flags;
dst->flags2 = src->flags2;
copy_fields(skip_loop_filter, subtitle_header);
dst->frame_number = src->frame_number;
dst->reordered_opaque = src->reordered_opaque;
if (src->slice_count && src->slice_offset) {
if (dst->slice_count < src->slice_count) {
int *tmp = av_realloc(dst->slice_offset, src->slice_count *
sizeof(*dst->slice_offset));
if (!tmp) {
av_free(dst->slice_offset);
return AVERROR(ENOMEM);
}
dst->slice_offset = tmp;
}
memcpy(dst->slice_offset, src->slice_offset,
src->slice_count * sizeof(*dst->slice_offset));
}
dst->slice_count = src->slice_count;
return 0;
#undef copy_fields
}
/// Releases the buffers that this decoding thread was the last user of.
static void release_delayed_buffers(PerThreadContext *p)
{
FrameThreadContext *fctx = p->parent;
while (p->num_released_buffers > 0) {
AVFrame *f;
pthread_mutex_lock(&fctx->buffer_mutex);
// fix extended data in case the caller screwed it up
av_assert0(p->avctx->codec_type == AVMEDIA_TYPE_VIDEO);
f = &p->released_buffers[--p->num_released_buffers];
f->extended_data = f->data;
av_frame_unref(f);
pthread_mutex_unlock(&fctx->buffer_mutex);
}
}
static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
{
FrameThreadContext *fctx = p->parent;
PerThreadContext *prev_thread = fctx->prev_thread;
const AVCodec *codec = p->avctx->codec;
if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;
pthread_mutex_lock(&p->mutex);
release_delayed_buffers(p);
if (prev_thread) {
int err;
if (prev_thread->state == STATE_SETTING_UP) {
pthread_mutex_lock(&prev_thread->progress_mutex);
while (prev_thread->state == STATE_SETTING_UP)
pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
pthread_mutex_unlock(&prev_thread->progress_mutex);
}
err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
if (err) {
pthread_mutex_unlock(&p->mutex);
return err;
}
}
av_packet_unref(&p->avpkt);
av_packet_ref(&p->avpkt, avpkt);
p->state = STATE_SETTING_UP;
pthread_cond_signal(&p->input_cond);
pthread_mutex_unlock(&p->mutex);
/*
* If the client doesn't have a thread-safe get_buffer(),
* then decoding threads call back to the main thread,
* and it calls back to the client here.
*/
FF_DISABLE_DEPRECATION_WARNINGS
if (!p->avctx->thread_safe_callbacks && (
#if FF_API_GET_BUFFER
p->avctx->get_buffer ||
#endif
p->avctx->get_buffer2 != avcodec_default_get_buffer2)) {
FF_ENABLE_DEPRECATION_WARNINGS
while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
pthread_mutex_lock(&p->progress_mutex);
while (p->state == STATE_SETTING_UP)
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
if (p->state == STATE_GET_BUFFER) {
p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);
p->state = STATE_SETTING_UP;
pthread_cond_signal(&p->progress_cond);
}
pthread_mutex_unlock(&p->progress_mutex);
}
}
fctx->prev_thread = p;
fctx->next_decoding++;
return 0;
}
int ff_thread_decode_frame(AVCodecContext *avctx,
AVFrame *picture, int *got_picture_ptr,
AVPacket *avpkt)
{
FrameThreadContext *fctx = avctx->internal->thread_ctx;
int finished = fctx->next_finished;
PerThreadContext *p;
int err;
/*
* Submit a packet to the next decoding thread.
*/
p = &fctx->threads[fctx->next_decoding];
err = update_context_from_user(p->avctx, avctx);
if (err) return err;
err = submit_packet(p, avpkt);
if (err) return err;
/*
* If we're still receiving the initial packets, don't return a frame.
*/
if (fctx->delaying) {
if (fctx->next_decoding >= (avctx->thread_count-1)) fctx->delaying = 0;
*got_picture_ptr=0;
if (avpkt->size)
return avpkt->size;
}
/*
* 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).
*/
do {
p = &fctx->threads[finished++];
if (p->state != STATE_INPUT_READY) {
pthread_mutex_lock(&p->progress_mutex);
while (p->state != STATE_INPUT_READY)
pthread_cond_wait(&p->output_cond, &p->progress_mutex);
pthread_mutex_unlock(&p->progress_mutex);
}
av_frame_move_ref(picture, p->frame);
*got_picture_ptr = p->got_frame;
picture->pkt_dts = p->avpkt.dts;
/*
* A later call with avkpt->size == 0 may loop over all threads,
* including this one, searching for a frame to return before being
* stopped by the "finished != fctx->next_finished" condition.
* Make sure we don't mistakenly return the same frame again.
*/
p->got_frame = 0;
if (finished >= avctx->thread_count) finished = 0;
} while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
update_context_from_thread(avctx, p->avctx, 1);
if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
fctx->next_finished = finished;
/* return the size of the consumed packet if no error occurred */
return (p->result >= 0) ? avpkt->size : p->result;
}
void ff_thread_report_progress(ThreadFrame *f, int n, int field)
{
PerThreadContext *p;
int *progress = f->progress ? (int*)f->progress->data : NULL;
if (!progress || progress[field] >= n) return;
p = f->owner->internal->thread_ctx;
if (f->owner->debug&FF_DEBUG_THREADS)
av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
pthread_mutex_lock(&p->progress_mutex);
progress[field] = n;
pthread_cond_broadcast(&p->progress_cond);
pthread_mutex_unlock(&p->progress_mutex);
}
void ff_thread_await_progress(ThreadFrame *f, int n, int field)
{
PerThreadContext *p;
int *progress = f->progress ? (int*)f->progress->data : NULL;
if (!progress || progress[field] >= n) return;
p = f->owner->internal->thread_ctx;
if (f->owner->debug&FF_DEBUG_THREADS)
av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
pthread_mutex_lock(&p->progress_mutex);
while (progress[field] < n)
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
pthread_mutex_unlock(&p->progress_mutex);
}
void ff_thread_finish_setup(AVCodecContext *avctx) {
PerThreadContext *p = avctx->internal->thread_ctx;
if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
pthread_mutex_lock(&p->progress_mutex);
p->state = STATE_SETUP_FINISHED;
pthread_cond_broadcast(&p->progress_cond);
pthread_mutex_unlock(&p->progress_mutex);
}
/// Waits for all threads to finish.
static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
{
int i;
for (i = 0; i < thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];
if (p->state != STATE_INPUT_READY) {
pthread_mutex_lock(&p->progress_mutex);
while (p->state != STATE_INPUT_READY)
pthread_cond_wait(&p->output_cond, &p->progress_mutex);
pthread_mutex_unlock(&p->progress_mutex);
}
}
}
void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
{
FrameThreadContext *fctx = avctx->internal->thread_ctx;
const AVCodec *codec = avctx->codec;
int i;
park_frame_worker_threads(fctx, thread_count);
if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
fctx->die = 1;
for (i = 0; i < thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];
pthread_mutex_lock(&p->mutex);
pthread_cond_signal(&p->input_cond);
pthread_mutex_unlock(&p->mutex);
if (p->thread_init)
pthread_join(p->thread, NULL);
if (codec->close)
codec->close(p->avctx);
avctx->codec = NULL;
release_delayed_buffers(p);
av_frame_free(&p->frame);
}
for (i = 0; i < thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];
pthread_mutex_destroy(&p->mutex);
pthread_mutex_destroy(&p->progress_mutex);
pthread_cond_destroy(&p->input_cond);
pthread_cond_destroy(&p->progress_cond);
pthread_cond_destroy(&p->output_cond);
av_packet_unref(&p->avpkt);
av_freep(&p->released_buffers);
if (i) {
av_freep(&p->avctx->priv_data);
av_freep(&p->avctx->slice_offset);
}
av_freep(&p->avctx->internal);
av_freep(&p->avctx);
}
av_freep(&fctx->threads);
pthread_mutex_destroy(&fctx->buffer_mutex);
av_freep(&avctx->internal->thread_ctx);
}
int ff_frame_thread_init(AVCodecContext *avctx)
{
int thread_count = avctx->thread_count;
const AVCodec *codec = avctx->codec;
AVCodecContext *src = avctx;
FrameThreadContext *fctx;
int i, err = 0;
#if HAVE_W32THREADS
w32thread_init();
#endif
if (!thread_count) {
int nb_cpus = av_cpu_count();
av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
// use number of cores + 1 as thread count if there is more than one
if (nb_cpus > 1)
thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
else
thread_count = avctx->thread_count = 1;
}
if (thread_count <= 1) {
avctx->active_thread_type = 0;
return 0;
}
avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
pthread_mutex_init(&fctx->buffer_mutex, NULL);
fctx->delaying = 1;
for (i = 0; i < thread_count; i++) {
AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
PerThreadContext *p = &fctx->threads[i];
pthread_mutex_init(&p->mutex, NULL);
pthread_mutex_init(&p->progress_mutex, NULL);
pthread_cond_init(&p->input_cond, NULL);
pthread_cond_init(&p->progress_cond, NULL);
pthread_cond_init(&p->output_cond, NULL);
p->frame = av_frame_alloc();
if (!p->frame) {
err = AVERROR(ENOMEM);
goto error;
}
p->parent = fctx;
p->avctx = copy;
if (!copy) {
err = AVERROR(ENOMEM);
goto error;
}
*copy = *src;
copy->internal = av_malloc(sizeof(AVCodecInternal));
if (!copy->internal) {
err = AVERROR(ENOMEM);
goto error;
}
*copy->internal = *src->internal;
copy->internal->thread_ctx = p;
copy->internal->pkt = &p->avpkt;
if (!i) {
src = copy;
if (codec->init)
err = codec->init(copy);
update_context_from_thread(avctx, copy, 1);
} else {
copy->priv_data = av_malloc(codec->priv_data_size);
if (!copy->priv_data) {
err = AVERROR(ENOMEM);
goto error;
}
memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
copy->internal->is_copy = 1;
if (codec->init_thread_copy)
err = codec->init_thread_copy(copy);
}
if (err) goto error;
if (!pthread_create(&p->thread, NULL, frame_worker_thread, p))
p->thread_init = 1;
}
return 0;
error:
ff_frame_thread_free(avctx, i+1);
return err;
}
void ff_thread_flush(AVCodecContext *avctx)
{
int i;
FrameThreadContext *fctx = avctx->internal->thread_ctx;
if (!fctx) return;
park_frame_worker_threads(fctx, avctx->thread_count);
if (fctx->prev_thread) {
if (fctx->prev_thread != &fctx->threads[0])
update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
}
fctx->next_decoding = fctx->next_finished = 0;
fctx->delaying = 1;
fctx->prev_thread = NULL;
for (i = 0; i < avctx->thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];
// Make sure decode flush calls with size=0 won't return old frames
p->got_frame = 0;
av_frame_unref(p->frame);
release_delayed_buffers(p);
if (avctx->codec->flush)
avctx->codec->flush(p->avctx);
}
}
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
{
PerThreadContext *p = avctx->internal->thread_ctx;
int err;
f->owner = avctx;
if (!(avctx->active_thread_type & FF_THREAD_FRAME))
return ff_get_buffer(avctx, f->f, flags);
if (p->state != STATE_SETTING_UP &&
(avctx->codec->update_thread_context || !avctx->thread_safe_callbacks)) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
return -1;
}
if (avctx->internal->allocate_progress) {
int *progress;
f->progress = av_buffer_alloc(2 * sizeof(int));
if (!f->progress) {
return AVERROR(ENOMEM);
}
progress = (int*)f->progress->data;
progress[0] = progress[1] = -1;
}
pthread_mutex_lock(&p->parent->buffer_mutex);
FF_DISABLE_DEPRECATION_WARNINGS
if (avctx->thread_safe_callbacks || (
#if FF_API_GET_BUFFER
!avctx->get_buffer &&
#endif
avctx->get_buffer2 == avcodec_default_get_buffer2)) {
FF_ENABLE_DEPRECATION_WARNINGS
err = ff_get_buffer(avctx, f->f, flags);
} else {
p->requested_frame = f->f;
p->requested_flags = flags;
p->state = STATE_GET_BUFFER;
pthread_mutex_lock(&p->progress_mutex);
pthread_cond_signal(&p->progress_cond);
while (p->state != STATE_SETTING_UP)
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
err = p->result;
pthread_mutex_unlock(&p->progress_mutex);
}
if (!avctx->thread_safe_callbacks && !avctx->codec->update_thread_context)
ff_thread_finish_setup(avctx);
if (err)
av_buffer_unref(&f->progress);
pthread_mutex_unlock(&p->parent->buffer_mutex);
return err;
}
void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
{
PerThreadContext *p = avctx->internal->thread_ctx;
FrameThreadContext *fctx;
AVFrame *dst, *tmp;
FF_DISABLE_DEPRECATION_WARNINGS
int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
avctx->thread_safe_callbacks ||
(
#if FF_API_GET_BUFFER
!avctx->get_buffer &&
#endif
avctx->get_buffer2 == avcodec_default_get_buffer2);
FF_ENABLE_DEPRECATION_WARNINGS
if (!f->f || !f->f->buf[0])
return;
if (avctx->debug & FF_DEBUG_BUFFERS)
av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
av_buffer_unref(&f->progress);
f->owner = NULL;
if (can_direct_free) {
av_frame_unref(f->f);
return;
}
fctx = p->parent;
pthread_mutex_lock(&fctx->buffer_mutex);
if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))
goto fail;
tmp = av_fast_realloc(p->released_buffers, &p->released_buffers_allocated,
(p->num_released_buffers + 1) *
sizeof(*p->released_buffers));
if (!tmp)
goto fail;
p->released_buffers = tmp;
dst = &p->released_buffers[p->num_released_buffers];
av_frame_move_ref(dst, f->f);
p->num_released_buffers++;
fail:
pthread_mutex_unlock(&fctx->buffer_mutex);
}
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