2 * Copyright (c) 2004 Roman Shaposhnik
4 * Many thanks to Steven M. Schultz for providing clever ideas and
5 * to Michael Niedermayer <michaelni@gmx.at> for writing initial
8 * This file is part of FFmpeg.
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 typedef int (action_func)(AVCodecContext *c, void *arg);
29 typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
31 typedef struct ThreadContext {
41 pthread_cond_t last_job_cond;
42 pthread_cond_t current_job_cond;
43 pthread_mutex_t current_job_lock;
48 static void* attribute_align_arg worker(void *v)
50 AVCodecContext *avctx = v;
51 ThreadContext *c = avctx->thread_opaque;
52 int our_job = c->job_count;
53 int thread_count = avctx->thread_count;
56 pthread_mutex_lock(&c->current_job_lock);
57 self_id = c->current_job++;
59 while (our_job >= c->job_count) {
60 if (c->current_job == thread_count + c->job_count)
61 pthread_cond_signal(&c->last_job_cond);
63 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
67 pthread_mutex_unlock(&c->current_job_lock);
71 pthread_mutex_unlock(&c->current_job_lock);
73 c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
74 c->func2(avctx, c->args, our_job, self_id);
76 pthread_mutex_lock(&c->current_job_lock);
77 our_job = c->current_job++;
81 static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
83 pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
84 pthread_mutex_unlock(&c->current_job_lock);
87 void avcodec_thread_free(AVCodecContext *avctx)
89 ThreadContext *c = avctx->thread_opaque;
92 pthread_mutex_lock(&c->current_job_lock);
94 pthread_cond_broadcast(&c->current_job_cond);
95 pthread_mutex_unlock(&c->current_job_lock);
97 for (i=0; i<avctx->thread_count; i++)
98 pthread_join(c->workers[i], NULL);
100 pthread_mutex_destroy(&c->current_job_lock);
101 pthread_cond_destroy(&c->current_job_cond);
102 pthread_cond_destroy(&c->last_job_cond);
104 av_freep(&avctx->thread_opaque);
107 static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
109 ThreadContext *c= avctx->thread_opaque;
115 pthread_mutex_lock(&c->current_job_lock);
117 c->current_job = avctx->thread_count;
118 c->job_count = job_count;
119 c->job_size = job_size;
124 c->rets_count = job_count;
126 c->rets = &dummy_ret;
129 pthread_cond_broadcast(&c->current_job_cond);
131 avcodec_thread_park_workers(c, avctx->thread_count);
136 static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
138 ThreadContext *c= avctx->thread_opaque;
140 return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
143 int avcodec_thread_init(AVCodecContext *avctx, int thread_count)
148 avctx->thread_count = thread_count;
150 if (thread_count <= 1)
153 c = av_mallocz(sizeof(ThreadContext));
157 c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
163 avctx->thread_opaque = c;
168 pthread_cond_init(&c->current_job_cond, NULL);
169 pthread_cond_init(&c->last_job_cond, NULL);
170 pthread_mutex_init(&c->current_job_lock, NULL);
171 pthread_mutex_lock(&c->current_job_lock);
172 for (i=0; i<thread_count; i++) {
173 if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
174 avctx->thread_count = i;
175 pthread_mutex_unlock(&c->current_job_lock);
176 avcodec_thread_free(avctx);
181 avcodec_thread_park_workers(c, thread_count);
183 avctx->execute = avcodec_thread_execute;
184 avctx->execute2 = avcodec_thread_execute2;