diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/beosthread.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/beosthread.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/beosthread.c b/contrib/ffmpeg/libavcodec/beosthread.c new file mode 100644 index 000000000..3d059912b --- /dev/null +++ b/contrib/ffmpeg/libavcodec/beosthread.c @@ -0,0 +1,182 @@ +/* + * Copyright (c) 2004 François Revol <revol@free.fr> + * + * 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 + * + */ +//#define DEBUG + +#include "avcodec.h" +#include "common.h" + +#include <OS.h> + +typedef struct ThreadContext{ + AVCodecContext *avctx; + thread_id thread; + sem_id work_sem; + sem_id done_sem; + int (*func)(AVCodecContext *c, void *arg); + void *arg; + int ret; +}ThreadContext; + +// it's odd Be never patented that :D +struct benaphore { + vint32 atom; + sem_id sem; +}; +static inline int lock_ben(struct benaphore *ben) +{ + if (atomic_add(&ben->atom, 1) > 0) + return acquire_sem(ben->sem); + return B_OK; +} +static inline int unlock_ben(struct benaphore *ben) +{ + if (atomic_add(&ben->atom, -1) > 1) + return release_sem(ben->sem); + return B_OK; +} + +static struct benaphore av_thread_lib_ben; + +static int32 ff_thread_func(void *v){ + ThreadContext *c= v; + + for(;;){ +//printf("thread_func %X enter wait\n", (int)v); fflush(stdout); + acquire_sem(c->work_sem); +//printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout); + if(c->func) + c->ret= c->func(c->avctx, c->arg); + else + return 0; +//printf("thread_func %X signal complete\n", (int)v); fflush(stdout); + release_sem(c->done_sem); + } + + return B_OK; +} + +/** + * free what has been allocated by avcodec_thread_init(). + * must be called after decoding has finished, especially dont call while avcodec_thread_execute() is running + */ +void avcodec_thread_free(AVCodecContext *s){ + ThreadContext *c= s->thread_opaque; + int i; + int32 ret; + + for(i=0; i<s->thread_count; i++){ + + c[i].func= NULL; + release_sem(c[i].work_sem); + wait_for_thread(c[i].thread, &ret); + if(c[i].work_sem > B_OK) delete_sem(c[i].work_sem); + if(c[i].done_sem > B_OK) delete_sem(c[i].done_sem); + } + + av_freep(&s->thread_opaque); +} + +int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){ + ThreadContext *c= s->thread_opaque; + int i; + + assert(s == c->avctx); + assert(count <= s->thread_count); + + /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */ + + for(i=0; i<count; i++){ + c[i].arg= arg[i]; + c[i].func= func; + c[i].ret= 12345; + + release_sem(c[i].work_sem); + } + for(i=0; i<count; i++){ + acquire_sem(c[i].done_sem); + + c[i].func= NULL; + if(ret) ret[i]= c[i].ret; + } + return 0; +} + +int avcodec_thread_init(AVCodecContext *s, int thread_count){ + int i; + ThreadContext *c; + + s->thread_count= thread_count; + + assert(!s->thread_opaque); + c= av_mallocz(sizeof(ThreadContext)*thread_count); + s->thread_opaque= c; + + for(i=0; i<thread_count; i++){ +//printf("init semaphors %d\n", i); fflush(stdout); + c[i].avctx= s; + + if((c[i].work_sem = create_sem(0, "ff work sem")) < B_OK) + goto fail; + if((c[i].done_sem = create_sem(0, "ff done sem")) < B_OK) + goto fail; + +//printf("create thread %d\n", i); fflush(stdout); + c[i].thread = spawn_thread(ff_thread_func, "libavcodec thread", B_LOW_PRIORITY, &c[i] ); + if( c[i].thread < B_OK ) goto fail; + resume_thread(c[i].thread ); + } +//printf("init done\n"); fflush(stdout); + + s->execute= avcodec_thread_execute; + + return 0; +fail: + avcodec_thread_free(s); + return -1; +} + +/* provide a mean to serialize calls to avcodec_*() for thread safety. */ + +int avcodec_thread_lock_lib(void) +{ + return lock_ben(&av_thread_lib_ben); +} + +int avcodec_thread_unlock_lib(void) +{ + return unlock_ben(&av_thread_lib_ben); +} + +/* our versions of _init and _fini (which are called by those actually from crt.o) */ + +void initialize_after(void) +{ + av_thread_lib_ben.atom = 0; + av_thread_lib_ben.sem = create_sem(0, "libavcodec benaphore"); +} + +void uninitialize_before(void) +{ + delete_sem(av_thread_lib_ben.sem); +} + + + |