videotoolbox: turn vtbcontext into singleton

sjy-nankai · Nov 8, 2016 · 4636b17 · 4636b17
1 parent a51cfe6
commit 4636b17
Showing 1 changed file with 33 additions and 0 deletions.
diff --git a/ios/IJKMediaPlayer/IJKMediaPlayer/ijkmedia/ijkplayer/ios/pipeline/IJKVideoToolBox.m b/ios/IJKMediaPlayer/IJKMediaPlayer/ijkmedia/ijkplayer/ios/pipeline/IJKVideoToolBox.m
@@ -34,6 +34,7 @@
 #import <CoreVideo/CVHostTime.h>
 #import <Foundation/Foundation.h>
 #import "IJKDeviceModel.h"
+#include <stdatomic.h>
 
 #define IJK_VTB_FCC_AVCC   SDL_FOURCC('C', 'c', 'v', 'a')
 
@@ -95,6 +96,10 @@
     SDL_SpeedSampler            sampler;
 };
 
+static volatile int _Atomic vtb_active = 0;
+static SDL_mutex *vtb_cond_mutex = NULL;
+static SDL_cond *vtb_cond = NULL;
+
 static void vtbformat_destroy(VTBFormatDesc *fmt_desc);
 static int  vtbformat_init(VTBFormatDesc *fmt_desc, AVCodecParameters *codecpar);
 
@@ -934,6 +939,11 @@ void videotoolbox_free(VideoToolBoxContext* context)
     vtbformat_destroy(&context->fmt_desc);
 
     avcodec_parameters_free(&context->codecpar);
+    assert(vtb_cond && vtb_cond_mutex);
+    SDL_LockMutex(vtb_cond_mutex);
+    atomic_store(&vtb_active, 0);
+    SDL_CondSignal(vtb_cond);
+    SDL_UnlockMutex(vtb_cond_mutex);
 }
 
 int videotoolbox_decode_frame(VideoToolBoxContext* context)
@@ -1120,8 +1130,31 @@ static int vtbformat_init(VTBFormatDesc *fmt_desc, AVCodecParameters *codecpar)
 
 VideoToolBoxContext* videotoolbox_create(FFPlayer* ffp, AVCodecContext* avctx)
 {
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        vtb_active = 0;
+        atomic_store(&vtb_active, 0);
+        vtb_cond = SDL_CreateCond();
+        vtb_cond_mutex = SDL_CreateMutex();
+    });
+
     int ret = 0;
 
+    SDL_LockMutex(vtb_cond_mutex);
+    if (atomic_load(&vtb_active)) {
+        SDL_CondWaitTimeout(vtb_cond, vtb_cond_mutex, 1000 * 10);
+        ret = atomic_load(&vtb_active);
+    }
+    if (!ret) {
+        atomic_store(&vtb_active, 1);
+    }
+    SDL_UnlockMutex(vtb_cond_mutex);
+
+    if (ret) {
+        ALOGW("%s - videotoolbox can not exists twice at the same time", __FUNCTION__);
+        return NULL;
+    }
+
     VideoToolBoxContext *context_vtb = (VideoToolBoxContext *)mallocz(sizeof(VideoToolBoxContext));
 
     context_vtb->sample_info_mutex = SDL_CreateMutex();