doc/APIchanges: add hashes and version numbers for recent entries

[ffmpeg] / libavcodec / frame_thread_encoder.c

diff --git a/libavcodec/frame_thread_encoder.c b/libavcodec/frame_thread_encoder.c
index 7c2894c933225df4ffb734950d558b2401082e7d..778317d60bbb479b238a24b6b06b98759e0eabf8 100644 (file)
--- a/libavcodec/frame_thread_encoder.c
+++ b/libavcodec/frame_thread_encoder.c
@@ -22,7 +22,6 @@
 
 #include "frame_thread_encoder.h"
 
-#include "libavutil/fifo.h"
 #include "libavutil/avassert.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/opt.h"
@@ -41,8 +40,7 @@
 typedef struct{
     AVFrame  *indata;
     AVPacket *outdata;
-    int64_t return_code;
-    unsigned index;
+    int       return_code;
     int       finished;
 } Task;
 
@@ -50,8 +48,7 @@ typedef struct{
     AVCodecContext *parent_avctx;
     pthread_mutex_t buffer_mutex;
 
-    AVFifoBuffer *task_fifo;
-    pthread_mutex_t task_fifo_mutex;
+    pthread_mutex_t task_fifo_mutex; /* Used to guard (next_)task_index */
     pthread_cond_t task_fifo_cond;
 
     unsigned max_tasks;
@@ -59,6 +56,7 @@ typedef struct{
     pthread_mutex_t finished_task_mutex; /* Guards tasks[i].finished */
     pthread_cond_t finished_task_cond;
 
+    unsigned next_task_index;
     unsigned task_index;
     unsigned finished_task_index;
 
@@ -74,24 +72,27 @@ static void * attribute_align_arg worker(void *v){
         int got_packet = 0, ret;
         AVPacket *pkt;
         AVFrame *frame;
-        Task task;
+        Task *task;
+        unsigned task_index;
 
         pthread_mutex_lock(&c->task_fifo_mutex);
-        while (av_fifo_size(c->task_fifo) <= 0 || atomic_load(&c->exit)) {
+        while (c->next_task_index == c->task_index || atomic_load(&c->exit)) {
             if (atomic_load(&c->exit)) {
                 pthread_mutex_unlock(&c->task_fifo_mutex);
                 goto end;
             }
             pthread_cond_wait(&c->task_fifo_cond, &c->task_fifo_mutex);
         }
-        av_fifo_generic_read(c->task_fifo, &task, sizeof(task), NULL);
+        task_index         = c->next_task_index;
+        c->next_task_index = (c->next_task_index + 1) % c->max_tasks;
         pthread_mutex_unlock(&c->task_fifo_mutex);
         /* The main thread ensures that any two outstanding tasks have
          * different indices, ergo each worker thread owns its element
          * of c->tasks with the exception of finished, which is shared
          * with the main thread and guarded by finished_task_mutex. */
-        frame = task.indata;
-        pkt   = c->tasks[task.index].outdata;
+        task  = &c->tasks[task_index];
+        frame = task->indata;
+        pkt   = task->outdata;
 
         ret = avctx->codec->encode2(avctx, pkt, frame, &got_packet);
         if(got_packet) {
@@ -106,10 +107,9 @@ static void * attribute_align_arg worker(void *v){
         pthread_mutex_lock(&c->buffer_mutex);
         av_frame_unref(frame);
         pthread_mutex_unlock(&c->buffer_mutex);
-        av_frame_free(&frame);
         pthread_mutex_lock(&c->finished_task_mutex);
-        c->tasks[task.index].return_code = ret;
-        c->tasks[task.index].finished    = 1;
+        task->return_code = ret;
+        task->finished    = 1;
         pthread_cond_signal(&c->finished_task_cond);
         pthread_mutex_unlock(&c->finished_task_mutex);
     }
@@ -187,12 +187,6 @@ int ff_frame_thread_encoder_init(AVCodecContext *avctx, AVDictionary *options){
 
     c->parent_avctx = avctx;
 
-    c->task_fifo = av_fifo_alloc_array(BUFFER_SIZE, sizeof(Task));
-    if (!c->task_fifo) {
-        av_freep(&avctx->internal->frame_thread_encoder);
-        return AVERROR(ENOMEM);
-    }
-
     pthread_mutex_init(&c->task_fifo_mutex, NULL);
     pthread_mutex_init(&c->finished_task_mutex, NULL);
     pthread_mutex_init(&c->buffer_mutex, NULL);
@@ -202,7 +196,8 @@ int ff_frame_thread_encoder_init(AVCodecContext *avctx, AVDictionary *options){
 
     c->max_tasks = avctx->thread_count + 2;
     for (unsigned i = 0; i < c->max_tasks; i++) {
-        if (!(c->tasks[i].outdata = av_packet_alloc()))
+        if (!(c->tasks[i].indata  = av_frame_alloc()) ||
+            !(c->tasks[i].outdata = av_packet_alloc()))
             goto fail;
     }
 
@@ -267,13 +262,8 @@ void ff_frame_thread_encoder_free(AVCodecContext *avctx){
          pthread_join(c->worker[i], NULL);
     }
 
-    while (av_fifo_size(c->task_fifo) > 0) {
-        Task task;
-        av_fifo_generic_read(c->task_fifo, &task, sizeof(task), NULL);
-        av_frame_free(&task.indata);
-    }
-
     for (unsigned i = 0; i < c->max_tasks; i++) {
+        av_frame_free(&c->tasks[i].indata);
         av_packet_free(&c->tasks[i].outdata);
     }
 
@@ -282,7 +272,6 @@ void ff_frame_thread_encoder_free(AVCodecContext *avctx){
     pthread_mutex_destroy(&c->buffer_mutex);
     pthread_cond_destroy(&c->task_fifo_cond);
     pthread_cond_destroy(&c->finished_task_cond);
-    av_fifo_freep(&c->task_fifo);
     av_freep(&avctx->internal->frame_thread_encoder);
 }
 
@@ -290,28 +279,23 @@ int ff_thread_video_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                                  AVFrame *frame, int *got_packet_ptr)
 {
     ThreadContext *c = avctx->internal->frame_thread_encoder;
-    Task *outtask, task;
+    Task *outtask;
 
     av_assert1(!*got_packet_ptr);
 
     if(frame){
-        AVFrame *new = av_frame_alloc();
-        if(!new)
-            return AVERROR(ENOMEM);
-        av_frame_move_ref(new, frame);
+        av_frame_move_ref(c->tasks[c->task_index].indata, frame);
 
-        task.index = c->task_index;
-        task.indata = (void*)new;
         pthread_mutex_lock(&c->task_fifo_mutex);
-        av_fifo_generic_write(c->task_fifo, &task, sizeof(task), NULL);
+        c->task_index = (c->task_index + 1) % c->max_tasks;
         pthread_cond_signal(&c->task_fifo_cond);
         pthread_mutex_unlock(&c->task_fifo_mutex);
-
-        c->task_index = (c->task_index + 1) % c->max_tasks;
     }
 
     outtask = &c->tasks[c->finished_task_index];
     pthread_mutex_lock(&c->finished_task_mutex);
+    /* The access to task_index in the following code is ok,
+     * because it is only ever changed by the main thread. */
     if (c->task_index == c->finished_task_index ||
         (frame && !outtask->finished &&
          (c->task_index - c->finished_task_index + c->max_tasks) % c->max_tasks <= avctx->thread_count)) {
@@ -321,6 +305,7 @@ int ff_thread_video_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     while (!outtask->finished) {
         pthread_cond_wait(&c->finished_task_cond, &c->finished_task_mutex);
     }
+    pthread_mutex_unlock(&c->finished_task_mutex);
     /* We now own outtask completely: No worker thread touches it any more,
      * because there is no outstanding task with this index. */
     outtask->finished = 0;
@@ -328,7 +313,6 @@ int ff_thread_video_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     if(pkt->data)
         *got_packet_ptr = 1;
     c->finished_task_index = (c->finished_task_index + 1) % c->max_tasks;
-    pthread_mutex_unlock(&c->finished_task_mutex);
 
     return outtask->return_code;
 }