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FFmpeg/libavcodec/pthread.c
Ben Jackson e3329474a3 pthread: Avoid crashes/odd behavior caused by spurious wakeups 
pthread_wait_cond can wake up for no reason (Wikipedia: Spurious_wakeup).
The FF_THREAD_SLICE thread mechanism could spontaneously execute jobs or
allow the caller of avctx->execute to return before all jobs were complete.
This adds tests to both cases to ensure the wakeup is real.

Signed-off-by: Ben Jackson <ben@ben.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-09-14 06:36:55 +02:00

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/*
* Copyright (c) 2004 Roman Shaposhnik
* Copyright (c) 2008 Alexander Strange (astrange@ithinksw.com)
*
* Many thanks to Steven M. Schultz for providing clever ideas and
* to Michael Niedermayer <michaelni@gmx.at> for writing initial
* implementation.
*
* 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
* Multithreading support functions
* @see doc/multithreading.txt
*/
#include "config.h"
#if HAVE_SCHED_GETAFFINITY
#define _GNU_SOURCE
#include <sched.h>
#endif
#if HAVE_GETPROCESSAFFINITYMASK
#include <windows.h>
#endif
#if HAVE_SYSCTL
#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#endif
#if HAVE_SYSCONF
#include <unistd.h>
#endif
#include "avcodec.h"
#include "internal.h"
#include "thread.h"
#include "libavutil/common.h"
#if HAVE_PTHREADS
#include <pthread.h>
#elif HAVE_W32THREADS
#include "w32pthreads.h"
#elif HAVE_OS2THREADS
#include "os2threads.h"
#endif
typedef int (action_func)(AVCodecContext *c, void *arg);
typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
typedef struct ThreadContext {
pthread_t *workers;
action_func *func;
action_func2 *func2;
void *args;
int *rets;
int rets_count;
int job_count;
int job_size;
pthread_cond_t last_job_cond;
pthread_cond_t current_job_cond;
pthread_mutex_t current_job_lock;
int current_job;
unsigned int current_execute;
int done;
} ThreadContext;
/// Max number of frame buffers that can be allocated when using frame threads.
#define MAX_BUFFERS (32+1)
/**
* Context used by codec threads and stored in their AVCodecContext thread_opaque.
*/
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).
int allocated_buf_size; ///< Size allocated for avpkt.data
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[MAX_BUFFERS];
int num_released_buffers;
/**
* Array of progress values used by ff_thread_get_buffer().
*/
volatile int progress[MAX_BUFFERS][2];
volatile uint8_t progress_used[MAX_BUFFERS];
AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
} PerThreadContext;
/**
* Context stored in the client AVCodecContext thread_opaque.
*/
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;
/* H264 slice threading seems to be buggy with more than 16 threads,
* limit the number of threads to 16 for automatic detection */
#define MAX_AUTO_THREADS 16
int ff_get_logical_cpus(AVCodecContext *avctx)
{
int ret, nb_cpus = 1;
#if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
cpu_set_t cpuset;
CPU_ZERO(&cpuset);
ret = sched_getaffinity(0, sizeof(cpuset), &cpuset);
if (!ret) {
nb_cpus = CPU_COUNT(&cpuset);
}
#elif HAVE_GETPROCESSAFFINITYMASK
DWORD_PTR proc_aff, sys_aff;
ret = GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff);
if (ret)
nb_cpus = av_popcount64(proc_aff);
#elif HAVE_SYSCTL && defined(HW_NCPU)
int mib[2] = { CTL_HW, HW_NCPU };
size_t len = sizeof(nb_cpus);
ret = sysctl(mib, 2, &nb_cpus, &len, NULL, 0);
if (ret == -1)
nb_cpus = 0;
#elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)
nb_cpus = sysconf(_SC_NPROC_ONLN);
#elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)
nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);
#endif
av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
if (avctx->height)
nb_cpus = FFMIN(nb_cpus, (avctx->height+15)/16);
return nb_cpus;
}
static void* attribute_align_arg worker(void *v)
{
AVCodecContext *avctx = v;
ThreadContext *c = avctx->thread_opaque;
int our_job = c->job_count;
int last_execute = 0;
int thread_count = avctx->thread_count;
int self_id;
pthread_mutex_lock(&c->current_job_lock);
self_id = c->current_job++;
for (;;){
while (our_job >= c->job_count) {
if (c->current_job == thread_count + c->job_count)
pthread_cond_signal(&c->last_job_cond);
while (last_execute == c->current_execute && !c->done)
pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
last_execute = c->current_execute;
our_job = self_id;
if (c->done) {
pthread_mutex_unlock(&c->current_job_lock);
return NULL;
}
}
pthread_mutex_unlock(&c->current_job_lock);
c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
c->func2(avctx, c->args, our_job, self_id);
pthread_mutex_lock(&c->current_job_lock);
our_job = c->current_job++;
}
}
static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
{
while (c->current_job != thread_count + c->job_count)
pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
pthread_mutex_unlock(&c->current_job_lock);
}
static void thread_free(AVCodecContext *avctx)
{
ThreadContext *c = avctx->thread_opaque;
int i;
pthread_mutex_lock(&c->current_job_lock);
c->done = 1;
pthread_cond_broadcast(&c->current_job_cond);
pthread_mutex_unlock(&c->current_job_lock);
for (i=0; i<avctx->thread_count; i++)
pthread_join(c->workers[i], NULL);
pthread_mutex_destroy(&c->current_job_lock);
pthread_cond_destroy(&c->current_job_cond);
pthread_cond_destroy(&c->last_job_cond);
av_free(c->workers);
av_freep(&avctx->thread_opaque);
}
static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
{
ThreadContext *c= avctx->thread_opaque;
int dummy_ret;
if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);
if (job_count <= 0)
return 0;
pthread_mutex_lock(&c->current_job_lock);
c->current_job = avctx->thread_count;
c->job_count = job_count;
c->job_size = job_size;
c->args = arg;
c->func = func;
if (ret) {
c->rets = ret;
c->rets_count = job_count;
} else {
c->rets = &dummy_ret;
c->rets_count = 1;
}
c->current_execute++;
pthread_cond_broadcast(&c->current_job_cond);
avcodec_thread_park_workers(c, avctx->thread_count);
return 0;
}
static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
{
ThreadContext *c= avctx->thread_opaque;
c->func2 = func2;
return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
}
static int thread_init(AVCodecContext *avctx)
{
int i;
ThreadContext *c;
int thread_count = avctx->thread_count;
if (!thread_count) {
int nb_cpus = ff_get_logical_cpus(avctx);
// 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;
}
c = av_mallocz(sizeof(ThreadContext));
if (!c)
return -1;
c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
if (!c->workers) {
av_free(c);
return -1;
}
avctx->thread_opaque = c;
c->current_job = 0;
c->job_count = 0;
c->job_size = 0;
c->done = 0;
pthread_cond_init(&c->current_job_cond, NULL);
pthread_cond_init(&c->last_job_cond, NULL);
pthread_mutex_init(&c->current_job_lock, NULL);
pthread_mutex_lock(&c->current_job_lock);
for (i=0; i<thread_count; i++) {
if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
avctx->thread_count = i;
pthread_mutex_unlock(&c->current_job_lock);
ff_thread_free(avctx);
return -1;
}
}
avcodec_thread_park_workers(c, thread_count);
avctx->execute = avcodec_thread_execute;
avctx->execute2 = avcodec_thread_execute2;
return 0;
}
/**
* 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;
pthread_mutex_lock(&p->mutex);
while (1) {
int i;
while (p->state == STATE_INPUT_READY && !fctx->die)
pthread_cond_wait(&p->input_cond, &p->mutex);
if (fctx->die) break;
if (!codec->update_thread_context && (avctx->thread_safe_callbacks || avctx->get_buffer == avcodec_default_get_buffer))
ff_thread_finish_setup(avctx);
avcodec_get_frame_defaults(&p->frame);
p->got_frame = 0;
p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);
if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
pthread_mutex_lock(&p->progress_mutex);
for (i = 0; i < MAX_BUFFERS; i++)
if (p->progress_used[i] && (p->got_frame || p->result<0 || avctx->codec_id != AV_CODEC_ID_H264)) {
p->progress[i][0] = INT_MAX;
p->progress[i][1] = INT_MAX;
}
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
*/
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;
dst->dtg_active_format = src->dtg_active_format;
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;
}
if (for_user) {
dst->delay = src->thread_count - 1;
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_buffer = src->get_buffer;
dst->release_buffer = src->release_buffer;
dst->opaque = src->opaque;
dst->debug = src->debug;
dst->debug_mv = src->debug_mv;
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;
dst->thread_safe_callbacks = src->thread_safe_callbacks;
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
}
static void free_progress(AVFrame *f)
{
PerThreadContext *p = f->owner->thread_opaque;
volatile int *progress = f->thread_opaque;
p->progress_used[(progress - p->progress[0]) / 2] = 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);
f = &p->released_buffers[--p->num_released_buffers];
free_progress(f);
f->thread_opaque = NULL;
f->owner->release_buffer(f->owner, 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;
uint8_t *buf = p->avpkt.data;
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_fast_malloc(&buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
p->avpkt = *avpkt;
p->avpkt.data = buf;
memcpy(buf, avpkt->data, avpkt->size);
memset(buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
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_buffer != avcodec_default_get_buffer) {
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 = p->avctx->get_buffer(p->avctx, p->requested_frame);
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->thread_opaque;
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);
}
*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(AVFrame *f, int n, int field)
{
PerThreadContext *p;
volatile int *progress = f->thread_opaque;
if (!progress || progress[field] >= n) return;
p = f->owner->thread_opaque;
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(AVFrame *f, int n, int field)
{
PerThreadContext *p;
volatile int *progress = f->thread_opaque;
if (!progress || progress[field] >= n) return;
p = f->owner->thread_opaque;
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->thread_opaque;
if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
if(p->state == STATE_SETUP_FINISHED){
av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
}
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);
}
p->got_frame = 0;
}
}
static void frame_thread_free(AVCodecContext *avctx, int thread_count)
{
FrameThreadContext *fctx = avctx->thread_opaque;
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);
p->thread_init=0;
if (codec->close)
codec->close(p->avctx);
avctx->codec = NULL;
release_delayed_buffers(p);
}
for (i = 0; i < thread_count; i++) {
PerThreadContext *p = &fctx->threads[i];
avcodec_default_free_buffers(p->avctx);
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_freep(&p->avpkt.data);
if (i) {
av_freep(&p->avctx->priv_data);
av_freep(&p->avctx->internal);
av_freep(&p->avctx->slice_offset);
}
av_freep(&p->avctx);
}
av_freep(&fctx->threads);
pthread_mutex_destroy(&fctx->buffer_mutex);
av_freep(&avctx->thread_opaque);
}
static int 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 = ff_get_logical_cpus(avctx);
if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
nb_cpus = 1;
// 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->thread_opaque = 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->parent = fctx;
p->avctx = copy;
if (!copy) {
err = AVERROR(ENOMEM);
goto error;
}
*copy = *src;
copy->thread_opaque = p;
copy->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 = av_malloc(sizeof(AVCodecInternal));
if (!copy->internal) {
err = AVERROR(ENOMEM);
goto error;
}
*copy->internal = *src->internal;
copy->internal->is_copy = 1;
if (codec->init_thread_copy)
err = codec->init_thread_copy(copy);
}
if (err) goto error;
err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
p->thread_init= !err;
if(!p->thread_init)
goto error;
}
return 0;
error:
frame_thread_free(avctx, i+1);
return err;
}
void ff_thread_flush(AVCodecContext *avctx)
{
int i;
FrameThreadContext *fctx = avctx->thread_opaque;
if (!avctx->thread_opaque) 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);
if (avctx->codec->flush)
avctx->codec->flush(fctx->threads[0].avctx);
}
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;
release_delayed_buffers(p);
}
}
static volatile int *allocate_progress(PerThreadContext *p)
{
int i;
for (i = 0; i < MAX_BUFFERS; i++)
if (!p->progress_used[i]) break;
if (i == MAX_BUFFERS) {
av_log(p->avctx, AV_LOG_ERROR, "allocate_progress() overflow\n");
return NULL;
}
p->progress_used[i] = 1;
return p->progress[i];
}
int ff_thread_can_start_frame(AVCodecContext *avctx)
{
PerThreadContext *p = avctx->thread_opaque;
if ((avctx->active_thread_type&FF_THREAD_FRAME) && p->state != STATE_SETTING_UP &&
(avctx->codec->update_thread_context || (!avctx->thread_safe_callbacks &&
avctx->get_buffer != avcodec_default_get_buffer))) {
return 0;
}
return 1;
}
int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
{
PerThreadContext *p = avctx->thread_opaque;
int err;
volatile int *progress;
f->owner = avctx;
ff_init_buffer_info(avctx, f);
if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
f->thread_opaque = NULL;
return avctx->get_buffer(avctx, f);
}
if (p->state != STATE_SETTING_UP &&
(avctx->codec->update_thread_context || (!avctx->thread_safe_callbacks &&
avctx->get_buffer != avcodec_default_get_buffer))) {
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);
f->thread_opaque = (int*)(progress = allocate_progress(p));
if (!progress) {
pthread_mutex_unlock(&p->parent->buffer_mutex);
return -1;
}
progress[0] =
progress[1] = -1;
if (avctx->thread_safe_callbacks ||
avctx->get_buffer == avcodec_default_get_buffer) {
err = avctx->get_buffer(avctx, f);
} else {
pthread_mutex_lock(&p->progress_mutex);
p->requested_frame = f;
p->state = STATE_GET_BUFFER;
pthread_cond_broadcast(&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->codec->update_thread_context)
ff_thread_finish_setup(avctx);
}
if (err) {
free_progress(f);
f->thread_opaque = NULL;
}
pthread_mutex_unlock(&p->parent->buffer_mutex);
return err;
}
void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f)
{
PerThreadContext *p = avctx->thread_opaque;
FrameThreadContext *fctx;
if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
avctx->release_buffer(avctx, f);
return;
}
if (p->num_released_buffers >= MAX_BUFFERS) {
av_log(p->avctx, AV_LOG_ERROR, "too many thread_release_buffer calls!\n");
return;
}
if(avctx->debug & FF_DEBUG_BUFFERS)
av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
fctx = p->parent;
pthread_mutex_lock(&fctx->buffer_mutex);
p->released_buffers[p->num_released_buffers++] = *f;
pthread_mutex_unlock(&fctx->buffer_mutex);
memset(f->data, 0, sizeof(f->data));
}
/**
* Set the threading algorithms used.
*
* Threading requires more than one thread.
* Frame threading requires entire frames to be passed to the codec,
* and introduces extra decoding delay, so is incompatible with low_delay.
*
* @param avctx The context.
*/
static void validate_thread_parameters(AVCodecContext *avctx)
{
int frame_threading_supported = (avctx->codec->capabilities & CODEC_CAP_FRAME_THREADS)
&& !(avctx->flags & CODEC_FLAG_TRUNCATED)
&& !(avctx->flags & CODEC_FLAG_LOW_DELAY)
&& !(avctx->flags2 & CODEC_FLAG2_CHUNKS);
if (avctx->thread_count == 1) {
avctx->active_thread_type = 0;
} else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
avctx->active_thread_type = FF_THREAD_FRAME;
} else if (avctx->codec->capabilities & CODEC_CAP_SLICE_THREADS &&
avctx->thread_type & FF_THREAD_SLICE) {
avctx->active_thread_type = FF_THREAD_SLICE;
} else if (!(avctx->codec->capabilities & CODEC_CAP_AUTO_THREADS)) {
avctx->thread_count = 1;
avctx->active_thread_type = 0;
}
if (avctx->thread_count > MAX_AUTO_THREADS)
av_log(avctx, AV_LOG_WARNING,
"Application has requested %d threads. Using a thread count greater than %d is not recommended.\n",
avctx->thread_count, MAX_AUTO_THREADS);
}
int ff_thread_init(AVCodecContext *avctx)
{
if (avctx->thread_opaque) {
av_log(avctx, AV_LOG_ERROR, "avcodec_thread_init is ignored after avcodec_open\n");
return -1;
}
#if HAVE_W32THREADS
w32thread_init();
#endif
if (avctx->codec) {
validate_thread_parameters(avctx);
if (avctx->active_thread_type&FF_THREAD_SLICE)
return thread_init(avctx);
else if (avctx->active_thread_type&FF_THREAD_FRAME)
return frame_thread_init(avctx);
}
return 0;
}
void ff_thread_free(AVCodecContext *avctx)
{
if (avctx->active_thread_type&FF_THREAD_FRAME)
frame_thread_free(avctx, avctx->thread_count);
else
thread_free(avctx);
}
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