diff options
Diffstat (limited to 'media/ffvpx/libavcodec/pthread.c')
| -rw-r--r-- | media/ffvpx/libavcodec/pthread.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/pthread.c b/media/ffvpx/libavcodec/pthread.c new file mode 100644 index 0000000000..ca84b81391 --- /dev/null +++ b/media/ffvpx/libavcodec/pthread.c @@ -0,0 +1,125 @@ +/* + * 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 "libavutil/thread.h" + +#include "avcodec.h" +#include "codec_internal.h" +#include "pthread_internal.h" +#include "thread.h" + +/** + * 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 & AV_CODEC_CAP_FRAME_THREADS) + && !(avctx->flags & AV_CODEC_FLAG_LOW_DELAY) + && !(avctx->flags2 & AV_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 & AV_CODEC_CAP_SLICE_THREADS && + avctx->thread_type & FF_THREAD_SLICE) { + avctx->active_thread_type = FF_THREAD_SLICE; + } else if (!(ffcodec(avctx->codec)->caps_internal & FF_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) +{ + validate_thread_parameters(avctx); + + if (avctx->active_thread_type&FF_THREAD_SLICE) + return ff_slice_thread_init(avctx); + else if (avctx->active_thread_type&FF_THREAD_FRAME) + return ff_frame_thread_init(avctx); + + return 0; +} + +void ff_thread_free(AVCodecContext *avctx) +{ + if (avctx->active_thread_type&FF_THREAD_FRAME) + ff_frame_thread_free(avctx, avctx->thread_count); + else + ff_slice_thread_free(avctx); +} + +av_cold void ff_pthread_free(void *obj, const unsigned offsets[]) +{ + unsigned cnt = *(unsigned*)((char*)obj + offsets[0]); + const unsigned *cur_offset = offsets; + + *(unsigned*)((char*)obj + offsets[0]) = 0; + + for (; *(++cur_offset) != THREAD_SENTINEL && cnt; cnt--) + pthread_mutex_destroy((pthread_mutex_t*)((char*)obj + *cur_offset)); + for (; *(++cur_offset) != THREAD_SENTINEL && cnt; cnt--) + pthread_cond_destroy ((pthread_cond_t *)((char*)obj + *cur_offset)); +} + +av_cold int ff_pthread_init(void *obj, const unsigned offsets[]) +{ + const unsigned *cur_offset = offsets; + unsigned cnt = 0; + int err; + +#define PTHREAD_INIT_LOOP(type) \ + for (; *(++cur_offset) != THREAD_SENTINEL; cnt++) { \ + pthread_ ## type ## _t *dst = (void*)((char*)obj + *cur_offset); \ + err = pthread_ ## type ## _init(dst, NULL); \ + if (err) { \ + err = AVERROR(err); \ + goto fail; \ + } \ + } + PTHREAD_INIT_LOOP(mutex) + PTHREAD_INIT_LOOP(cond) + +fail: + *(unsigned*)((char*)obj + offsets[0]) = cnt; + return err; +} |