| /* |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef AVCODEC_PTHREAD_INTERNAL_H |
| #define AVCODEC_PTHREAD_INTERNAL_H |
| |
| #include "avcodec.h" |
| |
| /* H.264 slice threading seems to be buggy with more than 16 threads, |
| * limit the number of threads to 16 for automatic detection */ |
| #define MAX_AUTO_THREADS 16 |
| |
| int ff_slice_thread_init(AVCodecContext *avctx); |
| void ff_slice_thread_free(AVCodecContext *avctx); |
| |
| int ff_frame_thread_init(AVCodecContext *avctx); |
| void ff_frame_thread_free(AVCodecContext *avctx, int thread_count); |
| |
| #define THREAD_SENTINEL 0 // This forbids putting a mutex/condition variable at the front. |
| /** |
| * Initialize/destroy a list of mutexes/conditions contained in a structure. |
| * The positions of these mutexes/conditions in the structure are given by |
| * their offsets. Because it is undefined behaviour to destroy |
| * an uninitialized mutex/condition, ff_pthread_init() stores the number |
| * of successfully initialized mutexes and conditions in the object itself |
| * and ff_pthread_free() uses this number to destroy exactly the mutexes and |
| * condition variables that have been successfully initialized. |
| * |
| * @param obj The object containing the mutexes/conditions. |
| * @param[in] offsets An array of offsets. Its first member gives the offset |
| * of the variable that contains the count of successfully |
| * initialized mutexes/condition variables; said variable |
| * must be an unsigned int. Two arrays of offsets, each |
| * delimited by a THREAD_SENTINEL follow. The first |
| * contains the offsets of all the mutexes, the second |
| * contains the offsets of all the condition variables. |
| */ |
| int ff_pthread_init(void *obj, const unsigned offsets[]); |
| void ff_pthread_free(void *obj, const unsigned offsets[]); |
| |
| /** |
| * Macros to help creating the above lists. mutexes and conds need |
| * to be parentheses-enclosed lists of offsets in the containing structure. |
| */ |
| #define OFFSET_ARRAY(...) __VA_ARGS__, THREAD_SENTINEL |
| #define DEFINE_OFFSET_ARRAY(type, name, cnt_variable, mutexes, conds) \ |
| static const unsigned name ## _offsets[] = { offsetof(type, cnt_variable), \ |
| OFFSET_ARRAY mutexes, \ |
| OFFSET_ARRAY conds } |
| |
| #endif // AVCODEC_PTHREAD_INTERNAL_H |
