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ffmpeg/libavcodec/frame_thread_encoder.c

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/*
* Copyright (c) 2012 Michael Niedermayer <michaelni@gmx.at>
*
* 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
*/
#include "frame_thread_encoder.h"
#include "libavutil/fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "internal.h"
#include "thread.h"
#if HAVE_PTHREADS
#include <pthread.h>
#elif HAVE_W32THREADS
#include "w32pthreads.h"
#elif HAVE_OS2THREADS
#include "os2threads.h"
#endif
#define MAX_THREADS 64
#define BUFFER_SIZE (2*MAX_THREADS)
typedef struct{
void *indata;
void *outdata;
int64_t return_code;
unsigned index;
} Task;
typedef struct{
AVCodecContext *parent_avctx;
pthread_mutex_t buffer_mutex;
AVFifoBuffer *task_fifo;
pthread_mutex_t task_fifo_mutex;
pthread_cond_t task_fifo_cond;
Task finished_tasks[BUFFER_SIZE];
pthread_mutex_t finished_task_mutex;
pthread_cond_t finished_task_cond;
unsigned task_index;
unsigned finished_task_index;
pthread_t worker[MAX_THREADS];
int exit;
} ThreadContext;
static void * attribute_align_arg worker(void *v){
AVCodecContext *avctx = v;
ThreadContext *c = avctx->internal->frame_thread_encoder;
AVPacket *pkt = NULL;
while(!c->exit){
int got_packet, ret;
AVFrame *frame;
Task task;
if(!pkt) pkt= av_mallocz(sizeof(*pkt));
if(!pkt) continue;
av_init_packet(pkt);
pthread_mutex_lock(&c->task_fifo_mutex);
while (av_fifo_size(c->task_fifo) <= 0 || c->exit) {
if(c->exit){
pthread_mutex_unlock(&c->task_fifo_mutex);
goto end;
}
pthread_cond_wait(&c->task_fifo_cond, &c->task_fifo_mutex);
}
av_fifo_generic_read(c->task_fifo, &task, sizeof(task), NULL);
pthread_mutex_unlock(&c->task_fifo_mutex);
frame = task.indata;
ret = avcodec_encode_video2(avctx, pkt, frame, &got_packet);
pthread_mutex_lock(&c->buffer_mutex);
c->parent_avctx->release_buffer(c->parent_avctx, frame);
pthread_mutex_unlock(&c->buffer_mutex);
av_freep(&frame);
if(!got_packet)
continue;
av_dup_packet(pkt);
pthread_mutex_lock(&c->finished_task_mutex);
c->finished_tasks[task.index].outdata = pkt; pkt = NULL;
c->finished_tasks[task.index].return_code = ret;
pthread_cond_signal(&c->finished_task_cond);
pthread_mutex_unlock(&c->finished_task_mutex);
}
end:
av_free(pkt);
pthread_mutex_lock(&c->buffer_mutex);
avcodec_close(avctx);
pthread_mutex_unlock(&c->buffer_mutex);
av_freep(&avctx);
return NULL;
}
int ff_frame_thread_encoder_init(AVCodecContext *avctx, AVDictionary *options){
int i=0;
ThreadContext *c;
if( !(avctx->thread_type & FF_THREAD_FRAME)
|| !(avctx->codec->capabilities & CODEC_CAP_INTRA_ONLY))
return 0;
if(!avctx->thread_count) {
avctx->thread_count = ff_get_logical_cpus(avctx);
avctx->thread_count = FFMIN(avctx->thread_count, MAX_THREADS);
}
if(avctx->thread_count <= 1)
return 0;
if(avctx->thread_count > MAX_THREADS)
return AVERROR(EINVAL);
av_assert0(!avctx->internal->frame_thread_encoder);
c = avctx->internal->frame_thread_encoder = av_mallocz(sizeof(ThreadContext));
if(!c)
return AVERROR(ENOMEM);
c->parent_avctx = avctx;
c->task_fifo = av_fifo_alloc(sizeof(Task) * BUFFER_SIZE);
if(!c->task_fifo)
goto fail;
pthread_mutex_init(&c->task_fifo_mutex, NULL);
pthread_mutex_init(&c->finished_task_mutex, NULL);
pthread_mutex_init(&c->buffer_mutex, NULL);
pthread_cond_init(&c->task_fifo_cond, NULL);
pthread_cond_init(&c->finished_task_cond, NULL);
for(i=0; i<avctx->thread_count ; i++){
AVDictionary *tmp = NULL;
AVCodecContext *thread_avctx = avcodec_alloc_context3(avctx->codec);
if(!thread_avctx)
goto fail;
*thread_avctx = *avctx;
thread_avctx->internal = NULL;
thread_avctx->priv_data = av_malloc(avctx->codec->priv_data_size);
if(!thread_avctx->priv_data) {
av_freep(&thread_avctx);
goto fail;
}
memcpy(thread_avctx->priv_data, avctx->priv_data, avctx->codec->priv_data_size);
thread_avctx->thread_count = 1;
thread_avctx->active_thread_type &= ~FF_THREAD_FRAME;
av_dict_copy(&tmp, options, 0);
av_dict_set(&tmp, "threads", "1", 0);
if(avcodec_open2(thread_avctx, avctx->codec, &tmp) < 0) {
av_dict_free(&tmp);
goto fail;
}
av_dict_free(&tmp);
av_assert0(!thread_avctx->internal->frame_thread_encoder);
thread_avctx->internal->frame_thread_encoder = c;
if(pthread_create(&c->worker[i], NULL, worker, thread_avctx)) {
goto fail;
}
}
avctx->active_thread_type = FF_THREAD_FRAME;
return 0;
fail:
avctx->thread_count = i;
av_log(avctx, AV_LOG_ERROR, "ff_frame_thread_encoder_init failed\n");
ff_frame_thread_encoder_free(avctx);
return -1;
}
void ff_frame_thread_encoder_free(AVCodecContext *avctx){
int i;
ThreadContext *c= avctx->internal->frame_thread_encoder;
pthread_mutex_lock(&c->task_fifo_mutex);
c->exit = 1;
pthread_cond_broadcast(&c->task_fifo_cond);
pthread_mutex_unlock(&c->task_fifo_mutex);
for (i=0; i<avctx->thread_count; i++) {
pthread_join(c->worker[i], NULL);
}
pthread_mutex_destroy(&c->task_fifo_mutex);
pthread_mutex_destroy(&c->finished_task_mutex);
pthread_mutex_destroy(&c->buffer_mutex);
pthread_cond_destroy(&c->task_fifo_cond);
pthread_cond_destroy(&c->finished_task_cond);
av_fifo_free(c->task_fifo); c->task_fifo = NULL;
av_freep(&avctx->internal->frame_thread_encoder);
}
int ff_thread_video_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet_ptr){
ThreadContext *c = avctx->internal->frame_thread_encoder;
Task task;
int ret;
av_assert1(!*got_packet_ptr);
if(frame){
if(!(avctx->flags & CODEC_FLAG_INPUT_PRESERVED)){
AVFrame *new = avcodec_alloc_frame();
if(!new)
return AVERROR(ENOMEM);
pthread_mutex_lock(&c->buffer_mutex);
ret = c->parent_avctx->get_buffer(c->parent_avctx, new);
pthread_mutex_unlock(&c->buffer_mutex);
if(ret<0)
return ret;
new->pts = frame->pts;
new->quality = frame->quality;
new->pict_type = frame->pict_type;
av_image_copy(new->data, new->linesize, (const uint8_t **)frame->data, frame->linesize,
avctx->pix_fmt, avctx->width, avctx->height);
frame = new;
}
task.index = c->task_index;
task.indata = (void*)frame;
pthread_mutex_lock(&c->task_fifo_mutex);
av_fifo_generic_write(c->task_fifo, &task, sizeof(task), NULL);
pthread_cond_signal(&c->task_fifo_cond);
pthread_mutex_unlock(&c->task_fifo_mutex);
c->task_index = (c->task_index+1) % BUFFER_SIZE;
if(!c->finished_tasks[c->finished_task_index].outdata && (c->task_index - c->finished_task_index) % BUFFER_SIZE <= avctx->thread_count)
return 0;
}
if(c->task_index == c->finished_task_index)
return 0;
pthread_mutex_lock(&c->finished_task_mutex);
while (!c->finished_tasks[c->finished_task_index].outdata) {
pthread_cond_wait(&c->finished_task_cond, &c->finished_task_mutex);
}
task = c->finished_tasks[c->finished_task_index];
*pkt = *(AVPacket*)(task.outdata);
c->finished_tasks[c->finished_task_index].outdata= NULL;
c->finished_task_index = (c->finished_task_index+1) % BUFFER_SIZE;
pthread_mutex_unlock(&c->finished_task_mutex);
*got_packet_ptr = 1;
return task.return_code;
}
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