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/* |
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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 "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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/** |
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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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✓✗ |
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&& !(avctx->flags & AV_CODEC_FLAG_TRUNCATED) |
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✓✗ |
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&& !(avctx->flags & AV_CODEC_FLAG_LOW_DELAY) |
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✓✓✓✓
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&& !(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS); |
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✓✓ |
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if (avctx->thread_count == 1) { |
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avctx->active_thread_type = 0; |
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✓✓✓✗
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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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✓✓ |
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} else if (avctx->codec->capabilities & AV_CODEC_CAP_SLICE_THREADS && |
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✓✗ |
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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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✓✗ |
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} else if (!(avctx->codec->capabilities & AV_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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✗✓ |
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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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✓✓ |
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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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✓✓ |
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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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✓✓ |
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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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} |