Implement ALSASink::drop()

Signed-off-by: mio <stigma@disroot.org>

akode/plugins/alsa_sink/alsa_sink.cpp

@@ -18,7 +18,9 @@
     Boston, MA 02110-1301, USA.
 */
 
-#include <iostream>
+// #define DEBUG
+
+#include "akode_debug.h"
 
 #include <alsa/asoundlib.h>
 #include <alsa/pcm.h>
@@ -308,4 +310,33 @@ void ALSASink::resume()
         snd_pcm_pause(m_data->pcm_playback, 0);
 }
 
+void ALSASink::drop()
+{
+    if (m_data->error)
+    {
+        AKODE_WARN("cannot drop frames because error with sink");
+        return;
+    }
+
+    int err = snd_pcm_drop(m_data->pcm_playback);
+    if (err < 0)
+    {
+        AKODE_WARN("unable to drop frames: " << snd_strerror(err));
+        return;
+    }
+
+    delete[] m_data->buffer;
+    m_data->buffer = new char[m_data->fragmentSize];
+    m_data->filled = 0;
+
+    err = snd_pcm_prepare(m_data->pcm_playback);
+    if (err < 0)
+    {
+        // No need to set error since calling writeFrame() or
+        // setAudioConfiguration() again.
+        AKODE_WARN("unable to prepare sink: " << snd_strerror(err));
+        return;
+    }
+}
+
 } // namespace

akode/plugins/alsa_sink/alsa_sink.h

@@ -43,6 +43,8 @@ public:
     void pause();
     void resume();
 
+    void drop() override;
+
     struct private_data;
 private:
     template<class T> bool _writeFrame(AudioFrame *frame);