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ffmpeg/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 "avcodec_internal.h"
#include "codec_internal.h"
#include "decode.h"
#include "hwaccel_internal.h"
#include "hwconfig.h"
#include "internal.h"
#include "pthread_internal.h"
#include "refstruct.h"
#include "thread.h"
#include "threadframe.h"
#include "version_major.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 after the codec has called ff_thread_finish_setup().
STATE_SETUP_FINISHED,
};
enum {
UNINITIALIZED, ///< Thread has not been created, AVCodec->close mustn't be called
NEEDS_CLOSE, ///< FFCodec->close needs to be called
INITIALIZED, ///< Thread has been properly set up
};
typedef struct ThreadFrameProgress {
atomic_int progress[2];
} ThreadFrameProgress;
/**
* Context used by codec threads and stored in their AVCodecInternal thread_ctx.
*/
typedef struct PerThreadContext {
struct FrameThreadContext *parent;
pthread_t thread;
int thread_init;
unsigned pthread_init_cnt;///< Number of successfully initialized mutexes/conditions
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;
int die; ///< Set when the thread should exit.
int hwaccel_serializing;
int async_serializing;
// set to 1 in ff_thread_finish_setup() when a threadsafe hwaccel is used;
// cannot check hwaccel caps directly, because
// worked threads clear hwaccel state for thread-unsafe hwaccels
// after each decode call
int hwaccel_threadsafe;
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.
unsigned pthread_init_cnt; ///< Number of successfully initialized mutexes/conditions
pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
/**
* This lock is used for ensuring threads run in serial when thread-unsafe
* 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.
*/
/* hwaccel state for thread-unsafe hwaccels is temporarily stored here in
* order to transfer its ownership to the next decoding thread without the
* need for extra synchronization */
const AVHWAccel *stash_hwaccel;
void *stash_hwaccel_context;
void *stash_hwaccel_priv;
} FrameThreadContext;
static int hwaccel_serial(const AVCodecContext *avctx)
{
return avctx->hwaccel && !(ffhwaccel(avctx->hwaccel)->caps_internal & HWACCEL_CAP_THREAD_SAFE);
}
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);
}
static void thread_set_name(PerThreadContext *p)
{
AVCodecContext *avctx = p->avctx;
int idx = p - p->parent->threads;
char name[16];
snprintf(name, sizeof(name), "av:%.7s:df%d", avctx->codec->name, idx);
ff_thread_setname(name);
}
/**
* 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 FFCodec *codec = ffcodec(avctx->codec);
thread_set_name(p);
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)
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 thread-unsafe hwaccel then we take the
* lock to ensure the threads don't run concurrently */
if (hwaccel_serial(avctx)) {
pthread_mutex_lock(&p->parent->hwaccel_mutex);
p->hwaccel_serializing = 1;
}
av_frame_unref(p->frame);
p->got_frame = 0;
p->result = codec->cb.decode(avctx, p->frame, &p->got_frame, p->avpkt);
if ((p->result < 0 || !p->got_frame) && p->frame->buf[0])
av_frame_unref(p->frame);
if (atomic_load(&p->state) == STATE_SETTING_UP)
ff_thread_finish_setup(avctx);
if (p->hwaccel_serializing) {
/* wipe hwaccel state for thread-unsafe hwaccels to avoid stale
* pointers lying around;
* the state was transferred to FrameThreadContext in
* ff_thread_finish_setup(), so nothing is leaked */
avctx->hwaccel = NULL;
avctx->hwaccel_context = NULL;
avctx->internal->hwaccel_priv_data = NULL;
p->hwaccel_serializing = 0;
pthread_mutex_unlock(&p->parent->hwaccel_mutex);
}
av_assert0(!avctx->hwaccel ||
(ffhwaccel(avctx->hwaccel)->caps_internal & HWACCEL_CAP_THREAD_SAFE));
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, const AVCodecContext *src, int for_user)
{
const FFCodec *const codec = ffcodec(dst->codec);
int err = 0;
if (dst != src && (for_user || codec->update_thread_context)) {
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->properties = src->properties;
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;
#if FF_API_TICKS_PER_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
dst->ticks_per_frame = src->ticks_per_frame;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
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->sample_rate = src->sample_rate;
dst->sample_fmt = src->sample_fmt;
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
dst->channels = src->channels;
dst->channel_layout = src->channel_layout;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
err = av_channel_layout_copy(&dst->ch_layout, &src->ch_layout);
if (err < 0)
return err;
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;
ff_refstruct_replace(&dst->internal->pool, src->internal->pool);
}
if (for_user) {
if (codec->update_thread_context_for_user)
err = codec->update_thread_context_for_user(dst, src);
} else {
const PerThreadContext *p_src = src->internal->thread_ctx;
PerThreadContext *p_dst = dst->internal->thread_ctx;
if (codec->update_thread_context) {
err = codec->update_thread_context(dst, src);
if (err < 0)
return err;
}
// reset dst hwaccel state if needed
av_assert0(p_dst->hwaccel_threadsafe ||
(!dst->hwaccel && !dst->internal->hwaccel_priv_data));
if (p_dst->hwaccel_threadsafe &&
(!p_src->hwaccel_threadsafe || dst->hwaccel != src->hwaccel)) {
ff_hwaccel_uninit(dst);
p_dst->hwaccel_threadsafe = 0;
}
// propagate hwaccel state for threadsafe hwaccels
if (p_src->hwaccel_threadsafe) {
const FFHWAccel *hwaccel = ffhwaccel(src->hwaccel);
if (!dst->hwaccel) {
if (hwaccel->priv_data_size) {
av_assert0(hwaccel->update_thread_context);
dst->internal->hwaccel_priv_data =
av_mallocz(hwaccel->priv_data_size);
if (!dst->internal->hwaccel_priv_data)
return AVERROR(ENOMEM);
}
dst->hwaccel = src->hwaccel;
}
av_assert0(dst->hwaccel == src->hwaccel);
if (hwaccel->update_thread_context) {
err = hwaccel->update_thread_context(dst, src);
if (err < 0) {
av_log(dst, AV_LOG_ERROR, "Error propagating hwaccel state\n");
ff_hwaccel_uninit(dst);
return err;
}
}
p_dst->hwaccel_threadsafe = 1;
}
}
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, const AVCodecContext *src)
{
int err;
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->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_num = src->frame_num;
#if FF_API_AVCTX_FRAME_NUMBER
FF_DISABLE_DEPRECATION_WARNINGS
dst->frame_number = src->frame_number;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
#if FF_API_REORDERED_OPAQUE
FF_DISABLE_DEPRECATION_WARNINGS
dst->reordered_opaque = src->reordered_opaque;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
av_packet_unref(dst->internal->last_pkt_props);
err = av_packet_copy_props(dst->internal->last_pkt_props, src->internal->last_pkt_props);
if (err < 0)
return err;
return 0;
}
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);
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;
}
}
/* transfer the stashed hwaccel state, if any */
av_assert0(!p->avctx->hwaccel || p->hwaccel_threadsafe);
if (!p->hwaccel_threadsafe) {
FFSWAP(const AVHWAccel*, p->avctx->hwaccel, fctx->stash_hwaccel);
FFSWAP(void*, p->avctx->hwaccel_context, fctx->stash_hwaccel_context);
FFSWAP(void*, p->avctx->internal->hwaccel_priv_data, fctx->stash_hwaccel_priv);
}
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);
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 ? f->progress->progress : 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(const ThreadFrame *f, int n, int field)
{
PerThreadContext *p;
atomic_int *progress = f->progress ? f->progress->progress : 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;
if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
p = avctx->internal->thread_ctx;
p->hwaccel_threadsafe = avctx->hwaccel &&
(ffhwaccel(avctx->hwaccel)->caps_internal & HWACCEL_CAP_THREAD_SAFE);
if (hwaccel_serial(avctx) && !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 &&
!(ffhwaccel(avctx->hwaccel)->caps_internal & HWACCEL_CAP_ASYNC_SAFE)) {
p->async_serializing = 1;
async_lock(p->parent);
}
/* thread-unsafe hwaccels share a single private data instance, so we
* save hwaccel state for passing to the next thread;
* this is done here so that this worker thread can wipe its own hwaccel
* state after decoding, without requiring synchronization */
av_assert0(!p->parent->stash_hwaccel);
if (hwaccel_serial(avctx)) {
p->parent->stash_hwaccel = avctx->hwaccel;
p->parent->stash_hwaccel_context = avctx->hwaccel_context;
p->parent->stash_hwaccel_priv = avctx->internal->hwaccel_priv_data;
}
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);
}
#define OFF(member) offsetof(FrameThreadContext, member)
DEFINE_OFFSET_ARRAY(FrameThreadContext, thread_ctx, pthread_init_cnt,
(OFF(buffer_mutex), OFF(hwaccel_mutex), OFF(async_mutex)),
(OFF(async_cond)));
#undef OFF
#define OFF(member) offsetof(PerThreadContext, member)
DEFINE_OFFSET_ARRAY(PerThreadContext, per_thread, pthread_init_cnt,
(OFF(progress_mutex), OFF(mutex)),
(OFF(input_cond), OFF(progress_cond), OFF(output_cond)));
#undef OFF
void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
{
FrameThreadContext *fctx = avctx->internal->thread_ctx;
const FFCodec *codec = ffcodec(avctx->codec);
int i;
park_frame_worker_threads(fctx, thread_count);
for (i = 0; i < thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];
AVCodecContext *ctx = p->avctx;
if (ctx->internal) {
if (p->thread_init == INITIALIZED) {
pthread_mutex_lock(&p->mutex);
p->die = 1;
pthread_cond_signal(&p->input_cond);
pthread_mutex_unlock(&p->mutex);
pthread_join(p->thread, NULL);
}
if (codec->close && p->thread_init != UNINITIALIZED)
codec->close(ctx);
/* When using a threadsafe hwaccel, this is where
* each thread's context is uninit'd and freed. */
ff_hwaccel_uninit(ctx);
if (ctx->priv_data) {
if (codec->p.priv_class)
av_opt_free(ctx->priv_data);
av_freep(&ctx->priv_data);
}
ff_refstruct_unref(&ctx->internal->pool);
av_packet_free(&ctx->internal->last_pkt_props);
av_freep(&ctx->internal);
av_buffer_unref(&ctx->hw_frames_ctx);
}
av_frame_free(&p->frame);
ff_pthread_free(p, per_thread_offsets);
av_packet_free(&p->avpkt);
av_freep(&p->avctx);
}
av_freep(&fctx->threads);
ff_pthread_free(fctx, thread_ctx_offsets);
/* if we have stashed hwaccel state, move it to the user-facing context,
* so it will be freed in ff_codec_close() */
av_assert0(!avctx->hwaccel);
FFSWAP(const AVHWAccel*, avctx->hwaccel, fctx->stash_hwaccel);
FFSWAP(void*, avctx->hwaccel_context, fctx->stash_hwaccel_context);
FFSWAP(void*, avctx->internal->hwaccel_priv_data, fctx->stash_hwaccel_priv);
av_freep(&avctx->internal->thread_ctx);
}
static av_cold int init_thread(PerThreadContext *p, int *threads_to_free,
FrameThreadContext *fctx, AVCodecContext *avctx,
const FFCodec *codec, int first)
{
AVCodecContext *copy;
int err;
atomic_init(&p->state, STATE_INPUT_READY);
copy = av_memdup(avctx, sizeof(*avctx));
if (!copy)
return AVERROR(ENOMEM);
copy->priv_data = NULL;
/* From now on, this PerThreadContext will be cleaned up by
* ff_frame_thread_free in case of errors. */
(*threads_to_free)++;
p->parent = fctx;
p->avctx = copy;
copy->internal = ff_decode_internal_alloc();
if (!copy->internal)
return AVERROR(ENOMEM);
copy->internal->thread_ctx = p;
copy->delay = avctx->delay;
if (codec->priv_data_size) {
copy->priv_data = av_mallocz(codec->priv_data_size);
if (!copy->priv_data)
return AVERROR(ENOMEM);
if (codec->p.priv_class) {
*(const AVClass **)copy->priv_data = codec->p.priv_class;
err = av_opt_copy(copy->priv_data, avctx->priv_data);
if (err < 0)
return err;
}
}
err = ff_pthread_init(p, per_thread_offsets);
if (err < 0)
return err;
if (!(p->frame = av_frame_alloc()) ||
!(p->avpkt = av_packet_alloc()))
return AVERROR(ENOMEM);
if (!first)
copy->internal->is_copy = 1;
copy->internal->last_pkt_props = av_packet_alloc();
if (!copy->internal->last_pkt_props)
return AVERROR(ENOMEM);
if (codec->init) {
err = codec->init(copy);
if (err < 0) {
if (codec->caps_internal & FF_CODEC_CAP_INIT_CLEANUP)
p->thread_init = NEEDS_CLOSE;
return err;
}
}
p->thread_init = NEEDS_CLOSE;
if (first)
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));
if (err < 0)
return err;
p->thread_init = INITIALIZED;
return 0;
}
int ff_frame_thread_init(AVCodecContext *avctx)
{
int thread_count = avctx->thread_count;
const FFCodec *codec = ffcodec(avctx->codec);
FrameThreadContext *fctx;
int err, i = 0;
if (!thread_count) {
int nb_cpus = av_cpu_count();
// 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);
err = ff_pthread_init(fctx, thread_ctx_offsets);
if (err < 0) {
ff_pthread_free(fctx, thread_ctx_offsets);
av_freep(&avctx->internal->thread_ctx);
return err;
}
fctx->async_lock = 1;
fctx->delaying = 1;
if (codec->p.type == AVMEDIA_TYPE_VIDEO)
avctx->delay = avctx->thread_count - 1;
fctx->threads = av_calloc(thread_count, sizeof(*fctx->threads));
if (!fctx->threads) {
err = AVERROR(ENOMEM);
goto error;
}
for (; i < thread_count; ) {
PerThreadContext *p = &fctx->threads[i];
int first = !i;
err = init_thread(p, &i, fctx, avctx, codec, first);
if (err < 0)
goto error;
}
return 0;
error:
ff_frame_thread_free(avctx, i);
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;
if (ffcodec(avctx->codec)->flush)
ffcodec(avctx->codec)->flush(p->avctx);
}
}
int ff_thread_can_start_frame(AVCodecContext *avctx)
{
if ((avctx->active_thread_type & FF_THREAD_FRAME) &&
ffcodec(avctx->codec)->update_thread_context) {
PerThreadContext *p = avctx->internal->thread_ctx;
if (atomic_load(&p->state) != STATE_SETTING_UP)
return 0;
}
return 1;
}
static int thread_get_buffer_internal(AVCodecContext *avctx, AVFrame *f, int flags)
{
PerThreadContext *p;
int err;
if (!(avctx->active_thread_type & FF_THREAD_FRAME))
return ff_get_buffer(avctx, f, flags);
p = avctx->internal->thread_ctx;
if (atomic_load(&p->state) != STATE_SETTING_UP &&
ffcodec(avctx->codec)->update_thread_context) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
return -1;
}
pthread_mutex_lock(&p->parent->buffer_mutex);
err = ff_get_buffer(avctx, f, flags);
pthread_mutex_unlock(&p->parent->buffer_mutex);
return err;
}
int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *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;
}
int ff_thread_get_ext_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
{
int ret;
f->owner[0] = f->owner[1] = avctx;
/* Hint: It is possible for this function to be called with codecs
* that don't support frame threading at all, namely in case
* a frame-threaded decoder shares code with codecs that are not.
* This currently affects non-MPEG-4 mpegvideo codecs and and VP7.
* The following check will always be true for them. */
if (!(avctx->active_thread_type & FF_THREAD_FRAME))
return ff_get_buffer(avctx, f->f, flags);
if (ffcodec(avctx->codec)->caps_internal & FF_CODEC_CAP_ALLOCATE_PROGRESS) {
f->progress = ff_refstruct_allocz(sizeof(*f->progress));
if (!f->progress)
return AVERROR(ENOMEM);
atomic_init(&f->progress->progress[0], -1);
atomic_init(&f->progress->progress[1], -1);
}
ret = ff_thread_get_buffer(avctx, f->f, flags);
if (ret)
ff_refstruct_unref(&f->progress);
return ret;
}
void ff_thread_release_ext_buffer(ThreadFrame *f)
{
ff_refstruct_unref(&f->progress);
f->owner[0] = f->owner[1] = NULL;
if (f->f)
av_frame_unref(f->f);
}
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