GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/pthread.c Lines: 29 30 96.7 %
Date: 2019-11-22 03:34:36 Branches: 22 28 78.6 %

Line Branch Exec Source
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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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                                && !(avctx->flags  & AV_CODEC_FLAG_TRUNCATED)
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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 (!(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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    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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}