| 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); |
| 123 | av_freep(&c->workers); |
| 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 | } |