some code for audio support

examples/ffPlayer.cpp

@@ -22,6 +22,9 @@ private:
     SDLWindowPtr _wnd;
     SDLRendererPtr _renderer;
     SDLTexturePtr _texture;
+    SDL_AudioSpec _audioSpec;
+    SDL_AudioDeviceID _aDevId;
+
     std::packaged_task<void()> _renderTask;
 
 public:
@@ -37,6 +40,17 @@ public:
 
         _texture.reset(SDL_CreateTexture(_renderer.get(), SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, WINDOW_WIDTH, WINDOW_HEIGHT));
         if(!_texture) throw std::runtime_error("Error creating SDL texture");
+
+        SDL_AudioSpec want;
+        SDL_zero(want);
+        want.freq = 44100;
+        want.format = AUDIO_S16;
+        want.channels = 2;
+        want.samples = 4096;
+        want.callback = SDLWindow::audioCallback;
+
+        _aDevId = SDL_OpenAudioDevice(nullptr, 0, &want, &_audioSpec, SDL_AUDIO_ALLOW_ANY_CHANGE);
+        if(_aDevId == 0) throw std::runtime_error("Error opening audio device");
     }
 
     void handleEvents() {
@@ -55,6 +69,11 @@ public:
         }
     }
 
+private:
+    static void audioCallback(void* userdata, Uint8* stream, int len) {
+
+    }
+
 public:
     virtual AVPixelFormat getPixelFormat() const noexcept override {
         return AV_PIX_FMT_YUV420P;

include/ffcpp/Player.h

@@ -8,6 +8,7 @@
 #include <thread>
 #include <condition_variable>
 #include <mutex>
+#include <cstdint>
 
 namespace ffcpp {
 
@@ -18,6 +19,11 @@ namespace ffcpp {
                                         int uPitch, int vPitch) = 0;
     };
 
+    struct IAudioSink {
+        virtual void setPauseCallback(std::function<void(bool)> callback) = 0;
+        virtual void setAudioDataCallback(std::function<void(uint8_t*,size_t)> callback) = 0;
+    };
+
     enum class PlayerState {
         Shutdown,
         Stopped,