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66 lines
3.0 KiB
66 lines
3.0 KiB
/* |
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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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#ifndef AVCODEC_PTHREAD_INTERNAL_H |
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#define AVCODEC_PTHREAD_INTERNAL_H |
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#include "avcodec.h" |
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/* H.264 slice threading seems to be buggy with more than 16 threads, |
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* limit the number of threads to 16 for automatic detection */ |
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#define MAX_AUTO_THREADS 16 |
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int ff_slice_thread_init(AVCodecContext *avctx); |
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void ff_slice_thread_free(AVCodecContext *avctx); |
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int ff_frame_thread_init(AVCodecContext *avctx); |
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void ff_frame_thread_free(AVCodecContext *avctx, int thread_count); |
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#define THREAD_SENTINEL 0 // This forbids putting a mutex/condition variable at the front. |
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/** |
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* Initialize/destroy a list of mutexes/conditions contained in a structure. |
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* The positions of these mutexes/conditions in the structure are given by |
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* their offsets. Because it is undefined behaviour to destroy |
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* an uninitialized mutex/condition, ff_pthread_init() stores the number |
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* of successfully initialized mutexes and conditions in the object itself |
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* and ff_pthread_free() uses this number to destroy exactly the mutexes and |
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* condition variables that have been successfully initialized. |
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* |
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* @param obj The object containing the mutexes/conditions. |
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* @param[in] offsets An array of offsets. Its first member gives the offset |
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* of the variable that contains the count of successfully |
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* initialized mutexes/condition variables; said variable |
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* must be an unsigned int. Two arrays of offsets, each |
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* delimited by a THREAD_SENTINEL follow. The first |
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* contains the offsets of all the mutexes, the second |
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* contains the offsets of all the condition variables. |
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*/ |
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int ff_pthread_init(void *obj, const unsigned offsets[]); |
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void ff_pthread_free(void *obj, const unsigned offsets[]); |
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/** |
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* Macros to help creating the above lists. mutexes and conds need |
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* to be parentheses-enclosed lists of offsets in the containing structure. |
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*/ |
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#define OFFSET_ARRAY(...) __VA_ARGS__, THREAD_SENTINEL |
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#define DEFINE_OFFSET_ARRAY(type, name, cnt_variable, mutexes, conds) \ |
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static const unsigned name ## _offsets[] = { offsetof(type, cnt_variable), \ |
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OFFSET_ARRAY mutexes, \ |
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OFFSET_ARRAY conds } |
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#endif // AVCODEC_PTHREAD_INTERNAL_H
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