From cc14ee03a7b91c69343f8d60c9e089a1950eeadb Mon Sep 17 00:00:00 2001 From: Anton Khirnov Date: Sun, 27 Oct 2013 12:22:52 +0100 Subject: lavc: split slice and frame threading functions into separate files --- libavcodec/pthread_slice.c | 224 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 224 insertions(+) create mode 100644 libavcodec/pthread_slice.c (limited to 'libavcodec/pthread_slice.c') diff --git a/libavcodec/pthread_slice.c b/libavcodec/pthread_slice.c new file mode 100644 index 0000000000..67ba3dd381 --- /dev/null +++ b/libavcodec/pthread_slice.c @@ -0,0 +1,224 @@ +/* + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Slice multithreading support functions + * @see doc/multithreading.txt + */ + +#include "config.h" + +#if HAVE_PTHREADS +#include +#elif HAVE_W32THREADS +#include "compat/w32pthreads.h" +#endif + +#include "avcodec.h" +#include "internal.h" +#include "pthread_internal.h" +#include "thread.h" + +#include "libavutil/common.h" +#include "libavutil/cpu.h" +#include "libavutil/mem.h" + +typedef int (action_func)(AVCodecContext *c, void *arg); +typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr); + +typedef struct ThreadContext { + pthread_t *workers; + action_func *func; + action_func2 *func2; + void *args; + int *rets; + int rets_count; + int job_count; + int job_size; + + pthread_cond_t last_job_cond; + pthread_cond_t current_job_cond; + pthread_mutex_t current_job_lock; + unsigned current_execute; + int current_job; + int done; +} ThreadContext; + +static void* attribute_align_arg worker(void *v) +{ + AVCodecContext *avctx = v; + ThreadContext *c = avctx->thread_opaque; + unsigned last_execute = 0; + int our_job = c->job_count; + int thread_count = avctx->thread_count; + int self_id; + + pthread_mutex_lock(&c->current_job_lock); + self_id = c->current_job++; + for (;;){ + while (our_job >= c->job_count) { + if (c->current_job == thread_count + c->job_count) + pthread_cond_signal(&c->last_job_cond); + + while (last_execute == c->current_execute && !c->done) + pthread_cond_wait(&c->current_job_cond, &c->current_job_lock); + last_execute = c->current_execute; + our_job = self_id; + + if (c->done) { + pthread_mutex_unlock(&c->current_job_lock); + return NULL; + } + } + pthread_mutex_unlock(&c->current_job_lock); + + c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size): + c->func2(avctx, c->args, our_job, self_id); + + pthread_mutex_lock(&c->current_job_lock); + our_job = c->current_job++; + } +} + +void ff_slice_thread_free(AVCodecContext *avctx) +{ + ThreadContext *c = avctx->thread_opaque; + int i; + + pthread_mutex_lock(&c->current_job_lock); + c->done = 1; + pthread_cond_broadcast(&c->current_job_cond); + pthread_mutex_unlock(&c->current_job_lock); + + for (i=0; ithread_count; i++) + pthread_join(c->workers[i], NULL); + + pthread_mutex_destroy(&c->current_job_lock); + pthread_cond_destroy(&c->current_job_cond); + pthread_cond_destroy(&c->last_job_cond); + av_free(c->workers); + av_freep(&avctx->thread_opaque); +} + +static av_always_inline void thread_park_workers(ThreadContext *c, int thread_count) +{ + while (c->current_job != thread_count + c->job_count) + pthread_cond_wait(&c->last_job_cond, &c->current_job_lock); + pthread_mutex_unlock(&c->current_job_lock); +} + +static int thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size) +{ + ThreadContext *c= avctx->thread_opaque; + int dummy_ret; + + if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1) + return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size); + + if (job_count <= 0) + return 0; + + pthread_mutex_lock(&c->current_job_lock); + + c->current_job = avctx->thread_count; + c->job_count = job_count; + c->job_size = job_size; + c->args = arg; + c->func = func; + if (ret) { + c->rets = ret; + c->rets_count = job_count; + } else { + c->rets = &dummy_ret; + c->rets_count = 1; + } + c->current_execute++; + pthread_cond_broadcast(&c->current_job_cond); + + thread_park_workers(c, avctx->thread_count); + + return 0; +} + +static int thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count) +{ + ThreadContext *c= avctx->thread_opaque; + c->func2 = func2; + return thread_execute(avctx, NULL, arg, ret, job_count, 0); +} + +int ff_slice_thread_init(AVCodecContext *avctx) +{ + int i; + ThreadContext *c; + int thread_count = avctx->thread_count; + +#if HAVE_W32THREADS + w32thread_init(); +#endif + + if (!thread_count) { + int nb_cpus = av_cpu_count(); + av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus); + // use number of cores + 1 as thread count if there is more than one + if (nb_cpus > 1) + thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS); + else + thread_count = avctx->thread_count = 1; + } + + if (thread_count <= 1) { + avctx->active_thread_type = 0; + return 0; + } + + c = av_mallocz(sizeof(ThreadContext)); + if (!c) + return -1; + + c->workers = av_mallocz(sizeof(pthread_t)*thread_count); + if (!c->workers) { + av_free(c); + return -1; + } + + avctx->thread_opaque = c; + c->current_job = 0; + c->job_count = 0; + c->job_size = 0; + c->done = 0; + pthread_cond_init(&c->current_job_cond, NULL); + pthread_cond_init(&c->last_job_cond, NULL); + pthread_mutex_init(&c->current_job_lock, NULL); + pthread_mutex_lock(&c->current_job_lock); + for (i=0; iworkers[i], NULL, worker, avctx)) { + avctx->thread_count = i; + pthread_mutex_unlock(&c->current_job_lock); + ff_thread_free(avctx); + return -1; + } + } + + thread_park_workers(c, thread_count); + + avctx->execute = thread_execute; + avctx->execute2 = thread_execute2; + return 0; +} -- cgit v1.2.3