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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
* Slice multithreading support functions
* @see doc/multithreading.txt
*/
#include "config.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "internal.h"
#include "pthread_internal.h"
#include "thread.h"
#include "libavutil/avassert.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/mem.h"
#include "libavutil/thread.h"
#include "libavutil/slicethread.h"
typedef int (action_func)(AVCodecContext *c, void *arg);
typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
typedef int (main_func)(AVCodecContext *c);
typedef struct SliceThreadContext {
AVSliceThread *thread;
action_func *func;
action_func2 *func2;
main_func *mainfunc;
void *args;
int *rets;
int job_size;
} SliceThreadContext;
static void main_function(void *priv) {
AVCodecContext *avctx = priv;
SliceThreadContext *c = avctx->internal->thread_ctx;
c->mainfunc(avctx);
}
static void worker_func(void *priv, int jobnr, int threadnr, int nb_jobs, int nb_threads)
{
AVCodecContext *avctx = priv;
SliceThreadContext *c = avctx->internal->thread_ctx;
int ret;
ret = c->func ? c->func(avctx, (char *)c->args + c->job_size * jobnr)
: c->func2(avctx, c->args, jobnr, threadnr);
if (c->rets)
c->rets[jobnr] = ret;
}
void ff_slice_thread_free(AVCodecContext *avctx)
{
SliceThreadContext *c = avctx->internal->thread_ctx;
avpriv_slicethread_free(&c->thread);
av_freep(&avctx->internal->thread_ctx);
}
static int thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
{
SliceThreadContext *c = avctx->internal->thread_ctx;
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;
c->job_size = job_size;
c->args = arg;
c->func = func;
c->rets = ret;
avpriv_slicethread_execute(c->thread, job_count, !!c->mainfunc );
return 0;
}
static int thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
{
SliceThreadContext *c = avctx->internal->thread_ctx;
c->func2 = func2;
return thread_execute(avctx, NULL, arg, ret, job_count, 0);
}
int ff_slice_thread_execute_with_mainfunc(AVCodecContext *avctx, action_func2* func2, main_func *mainfunc, void *arg, int *ret, int job_count)
{
SliceThreadContext *c = avctx->internal->thread_ctx;
c->func2 = func2;
c->mainfunc = mainfunc;
return thread_execute(avctx, NULL, arg, ret, job_count, 0);
}
int ff_slice_thread_init(AVCodecContext *avctx)
{
SliceThreadContext *c;
int thread_count = avctx->thread_count;
void (*mainfunc)(void *);
// We cannot do this in the encoder init as the threads are created before
if (av_codec_is_encoder(avctx->codec) &&
avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO &&
avctx->height > 2800)
thread_count = avctx->thread_count = 1;
if (!thread_count) {
int nb_cpus = av_cpu_count();
if (avctx->height)
nb_cpus = FFMIN(nb_cpus, (avctx->height+15)/16);
// 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 = c = av_mallocz(sizeof(*c));
mainfunc = ffcodec(avctx->codec)->caps_internal & FF_CODEC_CAP_SLICE_THREAD_HAS_MF ? &main_function : NULL;
if (!c || (thread_count = avpriv_slicethread_create(&c->thread, avctx, worker_func, mainfunc, thread_count)) <= 1) {
if (c)
avpriv_slicethread_free(&c->thread);
av_freep(&avctx->internal->thread_ctx);
avctx->thread_count = 1;
avctx->active_thread_type = 0;
return 0;
}
avctx->thread_count = thread_count;
avctx->execute = thread_execute;
avctx->execute2 = thread_execute2;
return 0;
}
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