avcodec/pthread_frame: Factor initializing single thread out

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/pthread_frame.c

@@ -763,52 +763,12 @@ void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
     avctx->codec = NULL;
 }
 
-int ff_frame_thread_init(AVCodecContext *avctx)
+static av_cold int init_thread(PerThreadContext *p,
+                               FrameThreadContext *fctx, AVCodecContext *avctx,
+                               AVCodecContext *src, const AVCodec *codec, int first)
 {
-    int thread_count = avctx->thread_count;
-    const AVCodec *codec = avctx->codec;
-    AVCodecContext *src = avctx;
-    FrameThreadContext *fctx;
-    int i, err = 0;
-
-    if (!thread_count) {
-        int nb_cpus = av_cpu_count();
-        // 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;
-    }
-
-    avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
-    if (!fctx)
-        return AVERROR(ENOMEM);
-
-    fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
-    if (!fctx->threads) {
-        av_freep(&avctx->internal->thread_ctx);
-        return AVERROR(ENOMEM);
-    }
-
-    pthread_mutex_init(&fctx->buffer_mutex, NULL);
-    pthread_mutex_init(&fctx->hwaccel_mutex, NULL);
-    pthread_mutex_init(&fctx->async_mutex, NULL);
-    pthread_cond_init(&fctx->async_cond, NULL);
-
-    fctx->async_lock = 1;
-    fctx->delaying = 1;
-
-    if (codec->type == AVMEDIA_TYPE_VIDEO)
-        avctx->delay = src->thread_count - 1;
-
-    for (i = 0; i < thread_count; i++) {
         AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
-        PerThreadContext *p  = &fctx->threads[i];
+    int err;
 
         pthread_mutex_init(&p->mutex, NULL);
         pthread_mutex_init(&p->progress_mutex, NULL);
@@ -819,22 +779,19 @@ int ff_frame_thread_init(AVCodecContext *avctx)
         p->frame = av_frame_alloc();
         if (!p->frame) {
             av_freep(&copy);
-            err = AVERROR(ENOMEM);
-            goto error;
+            return AVERROR(ENOMEM);
         }
         p->avpkt = av_packet_alloc();
         if (!p->avpkt) {
             av_freep(&copy);
-            err = AVERROR(ENOMEM);
-            goto error;
+            return AVERROR(ENOMEM);
         }
 
         p->parent = fctx;
         p->avctx  = copy;
 
         if (!copy) {
-            err = AVERROR(ENOMEM);
-            goto error;
+            return AVERROR(ENOMEM);
         }
 
         *copy = *src;
@@ -842,8 +799,7 @@ int ff_frame_thread_init(AVCodecContext *avctx)
         copy->internal = av_malloc(sizeof(AVCodecInternal));
         if (!copy->internal) {
             copy->priv_data = NULL;
-            err = AVERROR(ENOMEM);
-            goto error;
+            return AVERROR(ENOMEM);
         }
         *copy->internal = *src->internal;
         copy->internal->thread_ctx = p;
@@ -854,27 +810,27 @@ int ff_frame_thread_init(AVCodecContext *avctx)
         if (codec->priv_data_size) {
             copy->priv_data = av_mallocz(codec->priv_data_size);
             if (!copy->priv_data) {
-                err = AVERROR(ENOMEM);
-                goto error;
+                return AVERROR(ENOMEM);
             }
 
             if (codec->priv_class) {
                 *(const AVClass **)copy->priv_data = codec->priv_class;
                 err = av_opt_copy(copy->priv_data, src->priv_data);
                 if (err < 0)
-                    goto error;
+                    return err;
             }
         }
 
-        if (i)
+    if (!first)
             copy->internal->is_copy = 1;
 
         if (codec->init)
             err = codec->init(copy);
+        if (err < 0) {
+            return err;
+        }
 
-        if (err) goto error;
-
-        if (!i)
+    if (first)
             update_context_from_thread(avctx, copy, 1);
 
         atomic_init(&p->debug_threads, (copy->debug & FF_DEBUG_THREADS) != 0);
@@ -882,6 +838,59 @@ int ff_frame_thread_init(AVCodecContext *avctx)
         err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
         p->thread_init= !err;
         if(!p->thread_init)
+            return err;
+    return 0;
+}
+
+int ff_frame_thread_init(AVCodecContext *avctx)
+{
+    int thread_count = avctx->thread_count;
+    const AVCodec *codec = avctx->codec;
+    AVCodecContext *src = avctx;
+    FrameThreadContext *fctx;
+    int i, err = 0;
+
+    if (!thread_count) {
+        int nb_cpus = av_cpu_count();
+        // 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;
+    }
+
+    avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
+    if (!fctx)
+        return AVERROR(ENOMEM);
+
+    fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
+    if (!fctx->threads) {
+        av_freep(&avctx->internal->thread_ctx);
+        return AVERROR(ENOMEM);
+    }
+
+    pthread_mutex_init(&fctx->buffer_mutex, NULL);
+    pthread_mutex_init(&fctx->hwaccel_mutex, NULL);
+    pthread_mutex_init(&fctx->async_mutex, NULL);
+    pthread_cond_init(&fctx->async_cond, NULL);
+
+    fctx->async_lock = 1;
+    fctx->delaying = 1;
+
+    if (codec->type == AVMEDIA_TYPE_VIDEO)
+        avctx->delay = src->thread_count - 1;
+
+    for (i = 0; i < thread_count; i++) {
+        PerThreadContext *p  = &fctx->threads[i];
+        int first = !i;
+
+        err = init_thread(p, fctx, avctx, src, codec, first);
+        if (err < 0)
             goto error;
     }