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  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. static void validate_thread_parameters(AVCodecContext *avctx)
  47. {
  48.     int frame_threading_supported = (avctx->codec->capabilities & AV_CODEC_CAP_FRAME_THREADS)
  49.                                 && !(avctx->flags  & AV_CODEC_FLAG_TRUNCATED)
  50.                                 && !(avctx->flags  & AV_CODEC_FLAG_LOW_DELAY)
  51.                                 && !(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS);
  52.     if (avctx->thread_count == 1) {
  53.         avctx->active_thread_type = 0;
  54.     } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
  55.         avctx->active_thread_type = FF_THREAD_FRAME;
  56.     } else if (avctx->codec->capabilities & AV_CODEC_CAP_SLICE_THREADS &&
  57.                avctx->thread_type & FF_THREAD_SLICE) {
  58.         avctx->active_thread_type = FF_THREAD_SLICE;
  59.     } else if (!(avctx->codec->capabilities & AV_CODEC_CAP_AUTO_THREADS)) {
  60.         avctx->thread_count       = 1;
  61.         avctx->active_thread_type = 0;
  62.     }
  63.  
  64.     if (avctx->thread_count > MAX_AUTO_THREADS)
  65.         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. }
  69.  
  70. int ff_thread_init(AVCodecContext *avctx)
  71. {
  72.     validate_thread_parameters(avctx);
  73.  
  74.     if (avctx->active_thread_type&FF_THREAD_SLICE)
  75.         return ff_slice_thread_init(avctx);
  76.     else if (avctx->active_thread_type&FF_THREAD_FRAME)
  77.         return ff_frame_thread_init(avctx);
  78.  
  79.     return 0;
  80. }
  81.  
  82. void ff_thread_free(AVCodecContext *avctx)
  83. {
  84.     if (avctx->active_thread_type&FF_THREAD_FRAME)
  85.         ff_frame_thread_free(avctx, avctx->thread_count);
  86.     else
  87.         ff_slice_thread_free(avctx);
  88. }
  89.