Commit | Line | Data |
---|---|---|
2ba45a60 DM |
1 | /* |
2 | * This file is part of FFmpeg. | |
3 | * | |
4 | * FFmpeg is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; either | |
7 | * version 2.1 of the License, or (at your option) any later version. | |
8 | * | |
9 | * FFmpeg is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU Lesser General Public | |
15 | * License along with FFmpeg; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | ||
19 | /** | |
20 | * @file | |
21 | * Slice multithreading support functions | |
22 | * @see doc/multithreading.txt | |
23 | */ | |
24 | ||
25 | #include "config.h" | |
26 | ||
27 | #if HAVE_PTHREADS | |
28 | #include <pthread.h> | |
29 | #elif HAVE_W32THREADS | |
30 | #include "compat/w32pthreads.h" | |
31 | #elif HAVE_OS2THREADS | |
32 | #include "compat/os2threads.h" | |
33 | #endif | |
34 | ||
35 | #include "avcodec.h" | |
36 | #include "internal.h" | |
37 | #include "pthread_internal.h" | |
38 | #include "thread.h" | |
39 | ||
40 | #include "libavutil/common.h" | |
41 | #include "libavutil/cpu.h" | |
42 | #include "libavutil/mem.h" | |
43 | ||
44 | typedef int (action_func)(AVCodecContext *c, void *arg); | |
45 | typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr); | |
46 | ||
47 | typedef struct SliceThreadContext { | |
48 | pthread_t *workers; | |
49 | action_func *func; | |
50 | action_func2 *func2; | |
51 | void *args; | |
52 | int *rets; | |
53 | int rets_count; | |
54 | int job_count; | |
55 | int job_size; | |
56 | ||
57 | pthread_cond_t last_job_cond; | |
58 | pthread_cond_t current_job_cond; | |
59 | pthread_mutex_t current_job_lock; | |
60 | unsigned current_execute; | |
61 | int current_job; | |
62 | int done; | |
63 | ||
64 | int *entries; | |
65 | int entries_count; | |
66 | int thread_count; | |
67 | pthread_cond_t *progress_cond; | |
68 | pthread_mutex_t *progress_mutex; | |
69 | } SliceThreadContext; | |
70 | ||
71 | static void* attribute_align_arg worker(void *v) | |
72 | { | |
73 | AVCodecContext *avctx = v; | |
74 | SliceThreadContext *c = avctx->internal->thread_ctx; | |
75 | unsigned last_execute = 0; | |
76 | int our_job = c->job_count; | |
77 | int thread_count = avctx->thread_count; | |
78 | int self_id; | |
79 | ||
80 | pthread_mutex_lock(&c->current_job_lock); | |
81 | self_id = c->current_job++; | |
82 | for (;;){ | |
83 | while (our_job >= c->job_count) { | |
84 | if (c->current_job == thread_count + c->job_count) | |
85 | pthread_cond_signal(&c->last_job_cond); | |
86 | ||
87 | while (last_execute == c->current_execute && !c->done) | |
88 | pthread_cond_wait(&c->current_job_cond, &c->current_job_lock); | |
89 | last_execute = c->current_execute; | |
90 | our_job = self_id; | |
91 | ||
92 | if (c->done) { | |
93 | pthread_mutex_unlock(&c->current_job_lock); | |
94 | return NULL; | |
95 | } | |
96 | } | |
97 | pthread_mutex_unlock(&c->current_job_lock); | |
98 | ||
99 | c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size): | |
100 | c->func2(avctx, c->args, our_job, self_id); | |
101 | ||
102 | pthread_mutex_lock(&c->current_job_lock); | |
103 | our_job = c->current_job++; | |
104 | } | |
105 | } | |
106 | ||
107 | void ff_slice_thread_free(AVCodecContext *avctx) | |
108 | { | |
109 | SliceThreadContext *c = avctx->internal->thread_ctx; | |
110 | int i; | |
111 | ||
112 | pthread_mutex_lock(&c->current_job_lock); | |
113 | c->done = 1; | |
114 | pthread_cond_broadcast(&c->current_job_cond); | |
115 | pthread_mutex_unlock(&c->current_job_lock); | |
116 | ||
117 | for (i=0; i<avctx->thread_count; i++) | |
118 | pthread_join(c->workers[i], NULL); | |
119 | ||
120 | pthread_mutex_destroy(&c->current_job_lock); | |
121 | pthread_cond_destroy(&c->current_job_cond); | |
122 | pthread_cond_destroy(&c->last_job_cond); | |
f6fa7814 | 123 | av_freep(&c->workers); |
2ba45a60 DM |
124 | av_freep(&avctx->internal->thread_ctx); |
125 | } | |
126 | ||
127 | static av_always_inline void thread_park_workers(SliceThreadContext *c, int thread_count) | |
128 | { | |
129 | while (c->current_job != thread_count + c->job_count) | |
130 | pthread_cond_wait(&c->last_job_cond, &c->current_job_lock); | |
131 | pthread_mutex_unlock(&c->current_job_lock); | |
132 | } | |
133 | ||
134 | static int thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size) | |
135 | { | |
136 | SliceThreadContext *c = avctx->internal->thread_ctx; | |
137 | int dummy_ret; | |
138 | ||
139 | if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1) | |
140 | return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size); | |
141 | ||
142 | if (job_count <= 0) | |
143 | return 0; | |
144 | ||
145 | pthread_mutex_lock(&c->current_job_lock); | |
146 | ||
147 | c->current_job = avctx->thread_count; | |
148 | c->job_count = job_count; | |
149 | c->job_size = job_size; | |
150 | c->args = arg; | |
151 | c->func = func; | |
152 | if (ret) { | |
153 | c->rets = ret; | |
154 | c->rets_count = job_count; | |
155 | } else { | |
156 | c->rets = &dummy_ret; | |
157 | c->rets_count = 1; | |
158 | } | |
159 | c->current_execute++; | |
160 | pthread_cond_broadcast(&c->current_job_cond); | |
161 | ||
162 | thread_park_workers(c, avctx->thread_count); | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | static int thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count) | |
168 | { | |
169 | SliceThreadContext *c = avctx->internal->thread_ctx; | |
170 | c->func2 = func2; | |
171 | return thread_execute(avctx, NULL, arg, ret, job_count, 0); | |
172 | } | |
173 | ||
174 | int ff_slice_thread_init(AVCodecContext *avctx) | |
175 | { | |
176 | int i; | |
177 | SliceThreadContext *c; | |
178 | int thread_count = avctx->thread_count; | |
179 | ||
180 | #if HAVE_W32THREADS | |
181 | w32thread_init(); | |
182 | #endif | |
183 | ||
184 | if (!thread_count) { | |
185 | int nb_cpus = av_cpu_count(); | |
186 | if (avctx->height) | |
187 | nb_cpus = FFMIN(nb_cpus, (avctx->height+15)/16); | |
188 | // use number of cores + 1 as thread count if there is more than one | |
189 | if (nb_cpus > 1) | |
190 | thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS); | |
191 | else | |
192 | thread_count = avctx->thread_count = 1; | |
193 | } | |
194 | ||
195 | if (thread_count <= 1) { | |
196 | avctx->active_thread_type = 0; | |
197 | return 0; | |
198 | } | |
199 | ||
200 | c = av_mallocz(sizeof(SliceThreadContext)); | |
201 | if (!c) | |
202 | return -1; | |
203 | ||
204 | c->workers = av_mallocz_array(thread_count, sizeof(pthread_t)); | |
205 | if (!c->workers) { | |
206 | av_free(c); | |
207 | return -1; | |
208 | } | |
209 | ||
210 | avctx->internal->thread_ctx = c; | |
211 | c->current_job = 0; | |
212 | c->job_count = 0; | |
213 | c->job_size = 0; | |
214 | c->done = 0; | |
215 | pthread_cond_init(&c->current_job_cond, NULL); | |
216 | pthread_cond_init(&c->last_job_cond, NULL); | |
217 | pthread_mutex_init(&c->current_job_lock, NULL); | |
218 | pthread_mutex_lock(&c->current_job_lock); | |
219 | for (i=0; i<thread_count; i++) { | |
220 | if(pthread_create(&c->workers[i], NULL, worker, avctx)) { | |
221 | avctx->thread_count = i; | |
222 | pthread_mutex_unlock(&c->current_job_lock); | |
223 | ff_thread_free(avctx); | |
224 | return -1; | |
225 | } | |
226 | } | |
227 | ||
228 | thread_park_workers(c, thread_count); | |
229 | ||
230 | avctx->execute = thread_execute; | |
231 | avctx->execute2 = thread_execute2; | |
232 | return 0; | |
233 | } | |
234 | ||
235 | void ff_thread_report_progress2(AVCodecContext *avctx, int field, int thread, int n) | |
236 | { | |
237 | SliceThreadContext *p = avctx->internal->thread_ctx; | |
238 | int *entries = p->entries; | |
239 | ||
240 | pthread_mutex_lock(&p->progress_mutex[thread]); | |
241 | entries[field] +=n; | |
242 | pthread_cond_signal(&p->progress_cond[thread]); | |
243 | pthread_mutex_unlock(&p->progress_mutex[thread]); | |
244 | } | |
245 | ||
246 | void ff_thread_await_progress2(AVCodecContext *avctx, int field, int thread, int shift) | |
247 | { | |
248 | SliceThreadContext *p = avctx->internal->thread_ctx; | |
249 | int *entries = p->entries; | |
250 | ||
251 | if (!entries || !field) return; | |
252 | ||
253 | thread = thread ? thread - 1 : p->thread_count - 1; | |
254 | ||
255 | pthread_mutex_lock(&p->progress_mutex[thread]); | |
256 | while ((entries[field - 1] - entries[field]) < shift){ | |
257 | pthread_cond_wait(&p->progress_cond[thread], &p->progress_mutex[thread]); | |
258 | } | |
259 | pthread_mutex_unlock(&p->progress_mutex[thread]); | |
260 | } | |
261 | ||
262 | int ff_alloc_entries(AVCodecContext *avctx, int count) | |
263 | { | |
264 | int i; | |
265 | ||
266 | if (avctx->active_thread_type & FF_THREAD_SLICE) { | |
267 | SliceThreadContext *p = avctx->internal->thread_ctx; | |
268 | p->thread_count = avctx->thread_count; | |
269 | p->entries = av_mallocz_array(count, sizeof(int)); | |
270 | ||
271 | p->progress_mutex = av_malloc_array(p->thread_count, sizeof(pthread_mutex_t)); | |
272 | p->progress_cond = av_malloc_array(p->thread_count, sizeof(pthread_cond_t)); | |
273 | ||
274 | if (!p->entries || !p->progress_mutex || !p->progress_cond) { | |
275 | av_freep(&p->entries); | |
276 | av_freep(&p->progress_mutex); | |
277 | av_freep(&p->progress_cond); | |
278 | return AVERROR(ENOMEM); | |
279 | } | |
280 | p->entries_count = count; | |
281 | ||
282 | for (i = 0; i < p->thread_count; i++) { | |
283 | pthread_mutex_init(&p->progress_mutex[i], NULL); | |
284 | pthread_cond_init(&p->progress_cond[i], NULL); | |
285 | } | |
286 | } | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | void ff_reset_entries(AVCodecContext *avctx) | |
292 | { | |
293 | SliceThreadContext *p = avctx->internal->thread_ctx; | |
294 | memset(p->entries, 0, p->entries_count * sizeof(int)); | |
295 | } |