mirror of
https://git.videolan.org/git/ffmpeg.git
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225 lines
6.3 KiB
C
225 lines
6.3 KiB
C
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/*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Slice multithreading support functions
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* @see doc/multithreading.txt
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*/
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#include "config.h"
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#if HAVE_PTHREADS
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#include <pthread.h>
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#elif HAVE_W32THREADS
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#include "compat/w32pthreads.h"
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#endif
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#include "avcodec.h"
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#include "internal.h"
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#include "pthread_internal.h"
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#include "thread.h"
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#include "libavutil/common.h"
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#include "libavutil/cpu.h"
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#include "libavutil/mem.h"
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typedef int (action_func)(AVCodecContext *c, void *arg);
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typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
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typedef struct ThreadContext {
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pthread_t *workers;
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action_func *func;
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action_func2 *func2;
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void *args;
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int *rets;
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int rets_count;
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int job_count;
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int job_size;
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pthread_cond_t last_job_cond;
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pthread_cond_t current_job_cond;
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pthread_mutex_t current_job_lock;
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unsigned current_execute;
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int current_job;
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int done;
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} ThreadContext;
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static void* attribute_align_arg worker(void *v)
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{
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AVCodecContext *avctx = v;
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ThreadContext *c = avctx->thread_opaque;
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unsigned last_execute = 0;
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int our_job = c->job_count;
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int thread_count = avctx->thread_count;
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int self_id;
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pthread_mutex_lock(&c->current_job_lock);
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self_id = c->current_job++;
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for (;;){
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while (our_job >= c->job_count) {
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if (c->current_job == thread_count + c->job_count)
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pthread_cond_signal(&c->last_job_cond);
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while (last_execute == c->current_execute && !c->done)
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pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
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last_execute = c->current_execute;
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our_job = self_id;
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if (c->done) {
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pthread_mutex_unlock(&c->current_job_lock);
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return NULL;
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}
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}
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pthread_mutex_unlock(&c->current_job_lock);
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c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
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c->func2(avctx, c->args, our_job, self_id);
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pthread_mutex_lock(&c->current_job_lock);
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our_job = c->current_job++;
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}
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}
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void ff_slice_thread_free(AVCodecContext *avctx)
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{
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ThreadContext *c = avctx->thread_opaque;
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int i;
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pthread_mutex_lock(&c->current_job_lock);
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c->done = 1;
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pthread_cond_broadcast(&c->current_job_cond);
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pthread_mutex_unlock(&c->current_job_lock);
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for (i=0; i<avctx->thread_count; i++)
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pthread_join(c->workers[i], NULL);
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pthread_mutex_destroy(&c->current_job_lock);
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pthread_cond_destroy(&c->current_job_cond);
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pthread_cond_destroy(&c->last_job_cond);
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av_free(c->workers);
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av_freep(&avctx->thread_opaque);
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}
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static av_always_inline void thread_park_workers(ThreadContext *c, int thread_count)
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{
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while (c->current_job != thread_count + c->job_count)
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pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
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pthread_mutex_unlock(&c->current_job_lock);
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}
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static int thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
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{
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ThreadContext *c= avctx->thread_opaque;
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int dummy_ret;
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if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
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return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);
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if (job_count <= 0)
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return 0;
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pthread_mutex_lock(&c->current_job_lock);
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c->current_job = avctx->thread_count;
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c->job_count = job_count;
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c->job_size = job_size;
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c->args = arg;
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c->func = func;
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if (ret) {
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c->rets = ret;
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c->rets_count = job_count;
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} else {
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c->rets = &dummy_ret;
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c->rets_count = 1;
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}
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c->current_execute++;
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pthread_cond_broadcast(&c->current_job_cond);
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thread_park_workers(c, avctx->thread_count);
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return 0;
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}
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static int thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
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{
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ThreadContext *c= avctx->thread_opaque;
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c->func2 = func2;
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return thread_execute(avctx, NULL, arg, ret, job_count, 0);
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}
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int ff_slice_thread_init(AVCodecContext *avctx)
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{
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int i;
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ThreadContext *c;
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int thread_count = avctx->thread_count;
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#if HAVE_W32THREADS
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w32thread_init();
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#endif
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if (!thread_count) {
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int nb_cpus = av_cpu_count();
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av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
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// use number of cores + 1 as thread count if there is more than one
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if (nb_cpus > 1)
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thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
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else
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thread_count = avctx->thread_count = 1;
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}
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if (thread_count <= 1) {
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avctx->active_thread_type = 0;
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return 0;
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}
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c = av_mallocz(sizeof(ThreadContext));
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if (!c)
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return -1;
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c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
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if (!c->workers) {
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av_free(c);
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return -1;
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}
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avctx->thread_opaque = c;
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c->current_job = 0;
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c->job_count = 0;
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c->job_size = 0;
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c->done = 0;
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pthread_cond_init(&c->current_job_cond, NULL);
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pthread_cond_init(&c->last_job_cond, NULL);
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pthread_mutex_init(&c->current_job_lock, NULL);
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pthread_mutex_lock(&c->current_job_lock);
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for (i=0; i<thread_count; i++) {
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if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
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avctx->thread_count = i;
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pthread_mutex_unlock(&c->current_job_lock);
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ff_thread_free(avctx);
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return -1;
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}
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}
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thread_park_workers(c, thread_count);
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avctx->execute = thread_execute;
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avctx->execute2 = thread_execute2;
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return 0;
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}
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