1 files changed, 170 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/pthread.c b/contrib/ffmpeg/libavcodec/pthread.c
new file mode 100644
index 000000000..4737211cb
--- /dev/null
+++ b/contrib/ffmpeg/libavcodec/pthread.c
@@ -0,0 +1,170 @@
+/*
+ * Copyright (c) 2004 Roman Shaposhnik.
+ *
+ * Many thanks to Steven M. Schultz for providing clever ideas and
+ * to Michael Niedermayer <michaelni@gmx.at> for writing initial
+ * implementation.
+ *
+ * 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
+ *
+ */
+#include <pthread.h>
+
+#include "avcodec.h"
+#include "common.h"
+
+typedef int (action_t)(AVCodecContext *c, void *arg);
+
+typedef struct ThreadContext {
+    pthread_t *workers;
+    action_t *func;
+    void **args;
+    int *rets;
+    int rets_count;
+    int job_count;
+
+    pthread_cond_t last_job_cond;
+    pthread_cond_t current_job_cond;
+    pthread_mutex_t current_job_lock;
+    int current_job;
+    int done;
+} ThreadContext;
+
+static void* worker(void *v)
+{
+    AVCodecContext *avctx = v;
+    ThreadContext *c = avctx->thread_opaque;
+    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);
+
+            pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
+            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(avctx, c->args[our_job]);
+
+        pthread_mutex_lock(&c->current_job_lock);
+        our_job = c->current_job++;
+    }
+}
+
+static always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
+{
+    pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
+    pthread_mutex_unlock(&c->current_job_lock);
+}
+
+void avcodec_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; i<avctx->thread_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_free(c);
+}
+
+int avcodec_thread_execute(AVCodecContext *avctx, action_t* func, void **arg, int *ret, int job_count)
+{
+    ThreadContext *c= avctx->thread_opaque;
+    int dummy_ret;
+
+    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->args = arg;
+    c->func = func;
+    if (ret) {
+        c->rets = ret;
+        c->rets_count = job_count;
+    } else {
+        c->rets = &dummy_ret;
+        c->rets_count = 1;
+    }
+    pthread_cond_broadcast(&c->current_job_cond);
+
+    avcodec_thread_park_workers(c, avctx->thread_count);
+
+    return 0;
+}
+
+int avcodec_thread_init(AVCodecContext *avctx, int thread_count)
+{
+    int i;
+    ThreadContext *c;
+
+    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;
+    avctx->thread_count = thread_count;
+    c->current_job = 0;
+    c->job_count = 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; i<thread_count; i++) {
+        if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
+           avctx->thread_count = i;
+           pthread_mutex_unlock(&c->current_job_lock);
+           avcodec_thread_free(avctx);
+           return -1;
+        }
+    }
+
+    avcodec_thread_park_workers(c, thread_count);
+
+    avctx->execute = avcodec_thread_execute;
+    return 0;
+}