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FFmpeg4/libavcodec/pthread_frame.c

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/*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; 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 <stdatomic.h>
#include <stdint.h>
#include "avcodec.h"
#include "hwconfig.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"
#include "libavutil/opt.h"
#include "libavutil/thread.h"
enum {
///< Set when the thread is awaiting a packet.
STATE_INPUT_READY,
///< Set before the codec has called ff_thread_finish_setup().
STATE_SETTING_UP,
/**
* Set when the codec calls get_buffer().
* State is returned to STATE_SETTING_UP afterwards.
*/
STATE_GET_BUFFER,
/**
* Set when the codec calls get_format().
* State is returned to STATE_SETTING_UP afterwards.
*/
STATE_GET_FORMAT,
///< Set after the codec has called ff_thread_finish_setup().
STATE_SETUP_FINISHED,
};
/**
* 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.
atomic_int 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
const enum AVPixelFormat *available_formats; ///< Format array for get_format()
enum AVPixelFormat result_format; ///< get_format() result
int die; ///< Set when the thread should exit.
int hwaccel_serializing;
int async_serializing;
atomic_int debug_threads; ///< Set if the FF_DEBUG_THREADS option is set.
} 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().
/**
* This lock is used for ensuring threads run in serial when hwaccel
* is used.
*/
pthread_mutex_t hwaccel_mutex;
pthread_mutex_t async_mutex;
pthread_cond_t async_cond;
int async_lock;
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.
*/
} FrameThreadContext;
#define THREAD_SAFE_CALLBACKS(avctx) \
((avctx)->thread_safe_callbacks || (avctx)->get_buffer2 == avcodec_default_get_buffer2)
static void async_lock(FrameThreadContext *fctx)
{
pthread_mutex_lock(&fctx->async_mutex);
while (fctx->async_lock)
pthread_cond_wait(&fctx->async_cond, &fctx->async_mutex);
fctx->async_lock = 1;
pthread_mutex_unlock(&fctx->async_mutex);
}
static void async_unlock(FrameThreadContext *fctx)
{
pthread_mutex_lock(&fctx->async_mutex);
av_assert0(fctx->async_lock);
fctx->async_lock = 0;
pthread_cond_broadcast(&fctx->async_cond);
pthread_mutex_unlock(&fctx->async_mutex);
}
/**
* 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;
AVCodecContext *avctx = p->avctx;
const AVCodec *codec = avctx->codec;
pthread_mutex_lock(&p->mutex);
while (1) {
while (atomic_load(&p->state) == STATE_INPUT_READY && !p->die)
pthread_cond_wait(&p->input_cond, &p->mutex);
if (p->die) break;
if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
ff_thread_finish_setup(avctx);
/* If a decoder supports hwaccel, then it must call ff_get_format().
* Since that call must happen before ff_thread_finish_setup(), the
* decoder is required to implement update_thread_context() and call
* ff_thread_finish_setup() manually. Therefore the above
* ff_thread_finish_setup() call did not happen and hwaccel_serializing
* cannot be true here. */
av_assert0(!p->hwaccel_serializing);
/* if the previous thread uses hwaccel then we take the lock to ensure
* the threads don't run concurrently */
if (avctx->hwaccel) {
pthread_mutex_lock(&p->parent->hwaccel_mutex);
p->hwaccel_serializing = 1;
}
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->codec->caps_internal & FF_CODEC_CAP_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 (atomic_load(&p->state) == STATE_SETTING_UP)
ff_thread_finish_setup(avctx);
if (p->hwaccel_serializing) {
p->hwaccel_serializing = 0;
pthread_mutex_unlock(&p->parent->hwaccel_mutex);
}
if (p->async_serializing) {
p->async_serializing = 0;
async_unlock(p->parent);
}
pthread_mutex_lock(&p->progress_mutex);
atomic_store(&p->state, STATE_INPUT_READY);
pthread_cond_broadcast(&p->progress_cond);
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
* @return 0 on success, negative error code on failure
*/
static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
{
int err = 0;
if (dst != src && (for_user || !(src->codec_descriptor->props & AV_CODEC_PROP_INTRA_ONLY))) {
dst->time_base = src->time_base;
dst->framerate = src->framerate;
dst->width = src->width;
dst->height = src->height;
dst->pix_fmt = src->pix_fmt;
dst->sw_pix_fmt = src->sw_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;
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->channels = src->channels;
dst->sample_rate = src->sample_rate;
dst->sample_fmt = src->sample_fmt;
dst->channel_layout = src->channel_layout;
dst->internal->hwaccel_priv_data = src->internal->hwaccel_priv_data;
if (!!dst->hw_frames_ctx != !!src->hw_frames_ctx ||
(dst->hw_frames_ctx && dst->hw_frames_ctx->data != src->hw_frames_ctx->data)) {
av_buffer_unref(&dst->hw_frames_ctx);
if (src->hw_frames_ctx) {
dst->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx);
if (!dst->hw_frames_ctx)
return AVERROR(ENOMEM);
}
}
dst->hwaccel_flags = src->hwaccel_flags;
if (!!dst->internal->pool != !!src->internal->pool ||
(dst->internal->pool && dst->internal->pool->data != src->internal->pool->data)) {
av_buffer_unref(&dst->internal->pool);
if (src->internal->pool) {
dst->internal->pool = av_buffer_ref(src->internal->pool);
if (!dst->internal->pool)
return AVERROR(ENOMEM);
}
}
}
if (for_user) {
#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
dst->coded_frame = src->coded_frame;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
} 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)
{
dst->flags = src->flags;
dst->draw_horiz_band= src->draw_horiz_band;
dst->get_buffer2 = src->get_buffer2;
dst->opaque = src->opaque;
dst->debug = src->debug;
dst->debug_mv = src->debug_mv;
dst->slice_flags = src->slice_flags;
dst->flags2 = src->flags2;
dst->export_side_data = src->export_side_data;
dst->skip_loop_filter = src->skip_loop_filter;
dst->skip_idct = src->skip_idct;
dst->skip_frame = src->skip_frame;
dst->frame_number = src->frame_number;
dst->reordered_opaque = src->reordered_opaque;
dst->thread_safe_callbacks = src->thread_safe_callbacks;
if (src->slice_count && src->slice_offset) {
if (dst->slice_count < src->slice_count) {
int err = av_reallocp_array(&dst->slice_offset, src->slice_count,
sizeof(*dst->slice_offset));
if (err < 0)
return err;
}
memcpy(dst->slice_offset, src->slice_offset,
src->slice_count * sizeof(*dst->slice_offset));
}
dst->slice_count = src->slice_count;
return 0;
}
/// 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 ||
p->avctx->codec_type == AVMEDIA_TYPE_AUDIO);
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, AVCodecContext *user_avctx,
AVPacket *avpkt)
{
FrameThreadContext *fctx = p->parent;
PerThreadContext *prev_thread = fctx->prev_thread;
const AVCodec *codec = p->avctx->codec;
int ret;
if (!avpkt->size && !(codec->capabilities & AV_CODEC_CAP_DELAY))
return 0;
pthread_mutex_lock(&p->mutex);
ret = update_context_from_user(p->avctx, user_avctx);
if (ret) {
pthread_mutex_unlock(&p->mutex);
return ret;
}
atomic_store_explicit(&p->debug_threads,
(p->avctx->debug & FF_DEBUG_THREADS) != 0,
memory_order_relaxed);
release_delayed_buffers(p);
if (prev_thread) {
int err;
if (atomic_load(&prev_thread->state) == STATE_SETTING_UP) {
pthread_mutex_lock(&prev_thread->progress_mutex);
while (atomic_load(&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);
ret = av_packet_ref(&p->avpkt, avpkt);
if (ret < 0) {
pthread_mutex_unlock(&p->mutex);
av_log(p->avctx, AV_LOG_ERROR, "av_packet_ref() failed in submit_packet()\n");
return ret;
}
atomic_store(&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.
*/
if (!p->avctx->thread_safe_callbacks && (
p->avctx->get_format != avcodec_default_get_format ||
p->avctx->get_buffer2 != avcodec_default_get_buffer2)) {
while (atomic_load(&p->state) != STATE_SETUP_FINISHED && atomic_load(&p->state) != STATE_INPUT_READY) {
int call_done = 1;
pthread_mutex_lock(&p->progress_mutex);
while (atomic_load(&p->state) == STATE_SETTING_UP)
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
switch (atomic_load_explicit(&p->state, memory_order_acquire)) {
case STATE_GET_BUFFER:
p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);
break;
case STATE_GET_FORMAT:
p->result_format = ff_get_format(p->avctx, p->available_formats);
break;
default:
call_done = 0;
break;
}
if (call_done) {
atomic_store(&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;
/* release the async lock, permitting blocked hwaccel threads to
* go forward while we are in this function */
async_unlock(fctx);
/*
* Submit a packet to the next decoding thread.
*/
p = &fctx->threads[fctx->next_decoding];
err = submit_packet(p, avctx, avpkt);
if (err)
goto finish;
/*
* If we're still receiving the initial packets, don't return a frame.
*/
if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))
fctx->delaying = 0;
if (fctx->delaying) {
*got_picture_ptr=0;
if (avpkt->size) {
err = avpkt->size;
goto finish;
}
}
/*
* 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/error, because we don't want to accidentally signal
* EOF (avpkt->size == 0 && *got_picture_ptr == 0 && err >= 0).
*/
do {
p = &fctx->threads[finished++];
if (atomic_load(&p->state) != STATE_INPUT_READY) {
pthread_mutex_lock(&p->progress_mutex);
while (atomic_load_explicit(&p->state, memory_order_relaxed) != 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;
err = p->result;
/*
* A later call with avkpt->size == 0 may loop over all threads,
* 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/error again.
*/
p->got_frame = 0;
p->result = 0;
if (finished >= avctx->thread_count) finished = 0;
} while (!avpkt->size && !*got_picture_ptr && err >= 0 && 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 */
if (err >= 0)
err = avpkt->size;
finish:
async_lock(fctx);
return err;
}
void ff_thread_report_progress(ThreadFrame *f, int n, int field)
{
PerThreadContext *p;
atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
if (!progress ||
atomic_load_explicit(&progress[field], memory_order_relaxed) >= n)
return;
p = f->owner[field]->internal->thread_ctx;
if (atomic_load_explicit(&p->debug_threads, memory_order_relaxed))
av_log(f->owner[field], AV_LOG_DEBUG,
"%p finished %d field %d\n", progress, n, field);
pthread_mutex_lock(&p->progress_mutex);
atomic_store_explicit(&progress[field], n, memory_order_release);
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;
atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
if (!progress ||
atomic_load_explicit(&progress[field], memory_order_acquire) >= n)
return;
p = f->owner[field]->internal->thread_ctx;
if (atomic_load_explicit(&p->debug_threads, memory_order_relaxed))
av_log(f->owner[field], AV_LOG_DEBUG,
"thread awaiting %d field %d from %p\n", n, field, progress);
pthread_mutex_lock(&p->progress_mutex);
while (atomic_load_explicit(&progress[field], memory_order_relaxed) < 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;
if (avctx->hwaccel && !p->hwaccel_serializing) {
pthread_mutex_lock(&p->parent->hwaccel_mutex);
p->hwaccel_serializing = 1;
}
/* this assumes that no hwaccel calls happen before ff_thread_finish_setup() */
if (avctx->hwaccel &&
!(avctx->hwaccel->caps_internal & HWACCEL_CAP_ASYNC_SAFE)) {
p->async_serializing = 1;
async_lock(p->parent);
}
pthread_mutex_lock(&p->progress_mutex);
if(atomic_load(&p->state) == STATE_SETUP_FINISHED){
av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
}
atomic_store(&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;
async_unlock(fctx);
for (i = 0; i < thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];
if (atomic_load(&p->state) != STATE_INPUT_READY) {
pthread_mutex_lock(&p->progress_mutex);
while (atomic_load(&p->state) != STATE_INPUT_READY)
pthread_cond_wait(&p->output_cond, &p->progress_mutex);
pthread_mutex_unlock(&p->progress_mutex);
}
p->got_frame = 0;
}
async_lock(fctx);
}
void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
{
FrameThreadContext *fctx = avctx->internal->thread_ctx;
const AVCodec *codec = avctx->codec;
int i, j;
park_frame_worker_threads(fctx, thread_count);
if (fctx->prev_thread && avctx->internal->hwaccel_priv_data !=
fctx->prev_thread->avctx->internal->hwaccel_priv_data) {
if (update_context_from_thread(avctx, fctx->prev_thread->avctx, 1) < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to update user thread.\n");
}
}
if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
if (update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0) < 0) {
av_log(avctx, AV_LOG_ERROR, "Final thread update failed\n");
fctx->prev_thread->avctx->internal->is_copy = fctx->threads->avctx->internal->is_copy;
fctx->threads->avctx->internal->is_copy = 1;
}
for (i = 0; i < thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];
pthread_mutex_lock(&p->mutex);
p->die = 1;
pthread_cond_signal(&p->input_cond);
pthread_mutex_unlock(&p->mutex);
if (p->thread_init)
pthread_join(p->thread, NULL);
p->thread_init=0;
if (codec->close && p->avctx)
codec->close(p->avctx);
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);
for (j = 0; j < p->released_buffers_allocated; j++)
av_frame_free(&p->released_buffers[j]);
av_freep(&p->released_buffers);
if (p->avctx) {
if (codec->priv_class)
av_opt_free(p->avctx->priv_data);
av_freep(&p->avctx->priv_data);
av_freep(&p->avctx->slice_offset);
}
if (p->avctx) {
av_buffer_unref(&p->avctx->internal->pool);
av_freep(&p->avctx->internal);
av_buffer_unref(&p->avctx->hw_frames_ctx);
}
av_freep(&p->avctx);
}
av_freep(&fctx->threads);
pthread_mutex_destroy(&fctx->buffer_mutex);
pthread_mutex_destroy(&fctx->hwaccel_mutex);
pthread_mutex_destroy(&fctx->async_mutex);
pthread_cond_destroy(&fctx->async_cond);
av_freep(&avctx->internal->thread_ctx);
if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
av_opt_free(avctx->priv_data);
avctx->codec = NULL;
}
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 (!thread_count) {
int nb_cpus = av_cpu_count();
#if FF_API_DEBUG_MV
if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
nb_cpus = 1;
#endif
// 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));
if (!fctx)
return AVERROR(ENOMEM);
fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
if (!fctx->threads) {
av_freep(&avctx->internal->thread_ctx);
return AVERROR(ENOMEM);
}
pthread_mutex_init(&fctx->buffer_mutex, NULL);
pthread_mutex_init(&fctx->hwaccel_mutex, NULL);
pthread_mutex_init(&fctx->async_mutex, NULL);
pthread_cond_init(&fctx->async_cond, NULL);
fctx->async_lock = 1;
fctx->delaying = 1;
if (codec->type == AVMEDIA_TYPE_VIDEO)
avctx->delay = src->thread_count - 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) {
av_freep(&copy);
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) {
copy->priv_data = NULL;
err = AVERROR(ENOMEM);
goto error;
}
*copy->internal = *src->internal;
copy->internal->thread_ctx = p;
copy->internal->last_pkt_props = &p->avpkt;
copy->delay = avctx->delay;
if (codec->priv_data_size) {
copy->priv_data = av_mallocz(codec->priv_data_size);
if (!copy->priv_data) {
err = AVERROR(ENOMEM);
goto error;
}
if (codec->priv_class) {
*(const AVClass **)copy->priv_data = codec->priv_class;
err = av_opt_copy(copy->priv_data, src->priv_data);
if (err < 0)
goto error;
}
}
if (i)
copy->internal->is_copy = 1;
if (codec->init)
err = codec->init(copy);
if (err) goto error;
if (!i)
update_context_from_thread(avctx, copy, 1);
atomic_init(&p->debug_threads, (copy->debug & FF_DEBUG_THREADS) != 0);
err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
p->thread_init= !err;
if(!p->thread_init)
goto error;
}
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);
p->result = 0;
release_delayed_buffers(p);
if (avctx->codec->flush)
avctx->codec->flush(p->avctx);
}
}
int ff_thread_can_start_frame(AVCodecContext *avctx)
{
PerThreadContext *p = avctx->internal->thread_ctx;
if ((avctx->active_thread_type&FF_THREAD_FRAME) && atomic_load(&p->state) != STATE_SETTING_UP &&
(avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
return 0;
}
return 1;
}
static int thread_get_buffer_internal(AVCodecContext *avctx, ThreadFrame *f, int flags)
{
PerThreadContext *p = avctx->internal->thread_ctx;
int err;
f->owner[0] = f->owner[1] = avctx;
if (!(avctx->active_thread_type & FF_THREAD_FRAME))
return ff_get_buffer(avctx, f->f, flags);
if (atomic_load(&p->state) != STATE_SETTING_UP &&
(avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
return -1;
}
if (avctx->codec->caps_internal & FF_CODEC_CAP_ALLOCATE_PROGRESS) {
atomic_int *progress;
f->progress = av_buffer_alloc(2 * sizeof(*progress));
if (!f->progress) {
return AVERROR(ENOMEM);
}
progress = (atomic_int*)f->progress->data;
atomic_init(&progress[0], -1);
atomic_init(&progress[1], -1);
}
pthread_mutex_lock(&p->parent->buffer_mutex);
if (THREAD_SAFE_CALLBACKS(avctx)) {
err = ff_get_buffer(avctx, f->f, flags);
} else {
pthread_mutex_lock(&p->progress_mutex);
p->requested_frame = f->f;
p->requested_flags = flags;
atomic_store_explicit(&p->state, STATE_GET_BUFFER, memory_order_release);
pthread_cond_broadcast(&p->progress_cond);
while (atomic_load(&p->state) != STATE_SETTING_UP)
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
err = p->result;
pthread_mutex_unlock(&p->progress_mutex);
}
if (!THREAD_SAFE_CALLBACKS(avctx) && !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;
}
enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
{
enum AVPixelFormat res;
PerThreadContext *p = avctx->internal->thread_ctx;
if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
avctx->get_format == avcodec_default_get_format)
return ff_get_format(avctx, fmt);
if (atomic_load(&p->state) != STATE_SETTING_UP) {
av_log(avctx, AV_LOG_ERROR, "get_format() cannot be called after ff_thread_finish_setup()\n");
return -1;
}
pthread_mutex_lock(&p->progress_mutex);
p->available_formats = fmt;
atomic_store(&p->state, STATE_GET_FORMAT);
pthread_cond_broadcast(&p->progress_cond);
while (atomic_load(&p->state) != STATE_SETTING_UP)
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
res = p->result_format;
pthread_mutex_unlock(&p->progress_mutex);
return res;
}
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
{
int ret = thread_get_buffer_internal(avctx, f, flags);
if (ret < 0)
av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");
return ret;
}
void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
{
PerThreadContext *p = avctx->internal->thread_ctx;
FrameThreadContext *fctx;
AVFrame *dst;
int ret = 0;
int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
THREAD_SAFE_CALLBACKS(avctx);
if (!f->f)
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[0] = f->owner[1] = NULL;
// when the frame buffers are not allocated, just reset it to clean state
if (can_direct_free || !f->f->buf[0]) {
av_frame_unref(f->f);
return;
}
fctx = p->parent;
pthread_mutex_lock(&fctx->buffer_mutex);
if (p->num_released_buffers == p->released_buffers_allocated) {
AVFrame **tmp = av_realloc_array(p->released_buffers, p->released_buffers_allocated + 1,
sizeof(*p->released_buffers));
if (tmp) {
tmp[p->released_buffers_allocated] = av_frame_alloc();
p->released_buffers = tmp;
}
if (!tmp || !tmp[p->released_buffers_allocated]) {
ret = AVERROR(ENOMEM);
goto fail;
}
p->released_buffers_allocated++;
}
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);
// make sure the frame is clean even if we fail to free it
// this leaks, but it is better than crashing
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Could not queue a frame for freeing, this will leak\n");
memset(f->f->buf, 0, sizeof(f->f->buf));
if (f->f->extended_buf)
memset(f->f->extended_buf, 0, f->f->nb_extended_buf * sizeof(*f->f->extended_buf));
av_frame_unref(f->f);
}
}
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