LCOV - code coverage report
Current view: top level - libavcodec - pthread.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 29 30 96.7 %
Date: 2017-12-14 01:15:32 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2004 Roman Shaposhnik
       3             :  * Copyright (c) 2008 Alexander Strange (astrange@ithinksw.com)
       4             :  *
       5             :  * Many thanks to Steven M. Schultz for providing clever ideas and
       6             :  * to Michael Niedermayer <michaelni@gmx.at> for writing initial
       7             :  * implementation.
       8             :  *
       9             :  * This file is part of FFmpeg.
      10             :  *
      11             :  * FFmpeg is free software; you can redistribute it and/or
      12             :  * modify it under the terms of the GNU Lesser General Public
      13             :  * License as published by the Free Software Foundation; either
      14             :  * version 2.1 of the License, or (at your option) any later version.
      15             :  *
      16             :  * FFmpeg is distributed in the hope that it will be useful,
      17             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      18             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      19             :  * Lesser General Public License for more details.
      20             :  *
      21             :  * You should have received a copy of the GNU Lesser General Public
      22             :  * License along with FFmpeg; if not, write to the Free Software
      23             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      24             :  */
      25             : 
      26             : /**
      27             :  * @file
      28             :  * Multithreading support functions
      29             :  * @see doc/multithreading.txt
      30             :  */
      31             : 
      32             : #include "avcodec.h"
      33             : #include "internal.h"
      34             : #include "pthread_internal.h"
      35             : #include "thread.h"
      36             : 
      37             : /**
      38             :  * Set the threading algorithms used.
      39             :  *
      40             :  * Threading requires more than one thread.
      41             :  * Frame threading requires entire frames to be passed to the codec,
      42             :  * and introduces extra decoding delay, so is incompatible with low_delay.
      43             :  *
      44             :  * @param avctx The context.
      45             :  */
      46       17027 : static void validate_thread_parameters(AVCodecContext *avctx)
      47             : {
      48       34054 :     int frame_threading_supported = (avctx->codec->capabilities & AV_CODEC_CAP_FRAME_THREADS)
      49        2729 :                                 && !(avctx->flags  & AV_CODEC_FLAG_TRUNCATED)
      50        2729 :                                 && !(avctx->flags  & AV_CODEC_FLAG_LOW_DELAY)
      51       19756 :                                 && !(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS);
      52       17027 :     if (avctx->thread_count == 1) {
      53       14584 :         avctx->active_thread_type = 0;
      54        2443 :     } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
      55           5 :         avctx->active_thread_type = FF_THREAD_FRAME;
      56        2450 :     } else if (avctx->codec->capabilities & AV_CODEC_CAP_SLICE_THREADS &&
      57          12 :                avctx->thread_type & FF_THREAD_SLICE) {
      58          12 :         avctx->active_thread_type = FF_THREAD_SLICE;
      59        2426 :     } else if (!(avctx->codec->capabilities & AV_CODEC_CAP_AUTO_THREADS)) {
      60        2426 :         avctx->thread_count       = 1;
      61        2426 :         avctx->active_thread_type = 0;
      62             :     }
      63             : 
      64       17027 :     if (avctx->thread_count > MAX_AUTO_THREADS)
      65           0 :         av_log(avctx, AV_LOG_WARNING,
      66             :                "Application has requested %d threads. Using a thread count greater than %d is not recommended.\n",
      67             :                avctx->thread_count, MAX_AUTO_THREADS);
      68       17027 : }
      69             : 
      70       17027 : int ff_thread_init(AVCodecContext *avctx)
      71             : {
      72       17027 :     validate_thread_parameters(avctx);
      73             : 
      74       17027 :     if (avctx->active_thread_type&FF_THREAD_SLICE)
      75          12 :         return ff_slice_thread_init(avctx);
      76       17015 :     else if (avctx->active_thread_type&FF_THREAD_FRAME)
      77           5 :         return ff_frame_thread_init(avctx);
      78             : 
      79       17010 :     return 0;
      80             : }
      81             : 
      82          17 : void ff_thread_free(AVCodecContext *avctx)
      83             : {
      84          17 :     if (avctx->active_thread_type&FF_THREAD_FRAME)
      85           5 :         ff_frame_thread_free(avctx, avctx->thread_count);
      86             :     else
      87          12 :         ff_slice_thread_free(avctx);
      88          17 : }

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