mirror of https://git.ffmpeg.org/ffmpeg.git
127 lines
4.5 KiB
C
127 lines
4.5 KiB
C
/*
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* Copyright (c) 2004 Roman Shaposhnik
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* Copyright (c) 2008 Alexander Strange (astrange@ithinksw.com)
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*
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* Many thanks to Steven M. Schultz for providing clever ideas and
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* to Michael Niedermayer <michaelni@gmx.at> for writing initial
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* implementation.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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* Multithreading support functions
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* @see doc/multithreading.txt
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*/
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#include "libavutil/thread.h"
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#include "avcodec.h"
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#include "avcodec_internal.h"
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#include "codec_internal.h"
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#include "pthread_internal.h"
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#include "thread.h"
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/**
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* Set the threading algorithms used.
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*
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* Threading requires more than one thread.
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* Frame threading requires entire frames to be passed to the codec,
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* and introduces extra decoding delay, so is incompatible with low_delay.
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*
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* @param avctx The context.
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*/
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static void validate_thread_parameters(AVCodecContext *avctx)
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{
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int frame_threading_supported = (avctx->codec->capabilities & AV_CODEC_CAP_FRAME_THREADS)
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&& !(avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
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&& !(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS);
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if (avctx->thread_count == 1) {
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avctx->active_thread_type = 0;
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} else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
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avctx->active_thread_type = FF_THREAD_FRAME;
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} else if (avctx->codec->capabilities & AV_CODEC_CAP_SLICE_THREADS &&
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avctx->thread_type & FF_THREAD_SLICE) {
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avctx->active_thread_type = FF_THREAD_SLICE;
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} else if (!(ffcodec(avctx->codec)->caps_internal & FF_CODEC_CAP_AUTO_THREADS)) {
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avctx->thread_count = 1;
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avctx->active_thread_type = 0;
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}
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if (avctx->thread_count > MAX_AUTO_THREADS)
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av_log(avctx, AV_LOG_WARNING,
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"Application has requested %d threads. Using a thread count greater than %d is not recommended.\n",
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avctx->thread_count, MAX_AUTO_THREADS);
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}
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int ff_thread_init(AVCodecContext *avctx)
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{
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validate_thread_parameters(avctx);
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if (avctx->active_thread_type&FF_THREAD_SLICE)
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return ff_slice_thread_init(avctx);
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else if (avctx->active_thread_type&FF_THREAD_FRAME)
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return ff_frame_thread_init(avctx);
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return 0;
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}
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void ff_thread_free(AVCodecContext *avctx)
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{
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if (avctx->active_thread_type&FF_THREAD_FRAME)
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ff_frame_thread_free(avctx, avctx->thread_count);
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else
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ff_slice_thread_free(avctx);
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}
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av_cold void ff_pthread_free(void *obj, const unsigned offsets[])
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{
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unsigned cnt = *(unsigned*)((char*)obj + offsets[0]);
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const unsigned *cur_offset = offsets;
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*(unsigned*)((char*)obj + offsets[0]) = 0;
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for (; *(++cur_offset) != THREAD_SENTINEL && cnt; cnt--)
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pthread_mutex_destroy((pthread_mutex_t*)((char*)obj + *cur_offset));
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for (; *(++cur_offset) != THREAD_SENTINEL && cnt; cnt--)
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pthread_cond_destroy ((pthread_cond_t *)((char*)obj + *cur_offset));
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}
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av_cold int ff_pthread_init(void *obj, const unsigned offsets[])
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{
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const unsigned *cur_offset = offsets;
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unsigned cnt = 0;
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int err;
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#define PTHREAD_INIT_LOOP(type) \
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for (; *(++cur_offset) != THREAD_SENTINEL; cnt++) { \
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pthread_ ## type ## _t *dst = (void*)((char*)obj + *cur_offset); \
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err = pthread_ ## type ## _init(dst, NULL); \
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if (err) { \
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err = AVERROR(err); \
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goto fail; \
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} \
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}
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PTHREAD_INIT_LOOP(mutex)
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PTHREAD_INIT_LOOP(cond)
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fail:
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*(unsigned*)((char*)obj + offsets[0]) = cnt;
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return err;
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}
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