Add --audio-output-buffer

On some systems, the SDL audio callback is not called frequently enough
(for example it requests 5ms of samples every 10ms), because the output
buffer is too small.

By default, we want to use a small value (5ms) to minimize latency and
buffer underrun, but if it does not work well, users need a way to
increase it.

Refs #3793 <https://github.com/Genymobile/scrcpy/issues/3793>

app/src/audio_player.h

@@ -27,6 +27,10 @@ struct sc_audio_player {
     sc_tick target_buffering_delay;
     uint32_t target_buffering; // in samples
 
+    // SDL audio output buffer size.
+    sc_tick output_buffer_duration;
+    uint16_t output_buffer;
+
     // Audio buffer to communicate between the receiver and the SDL audio
     // callback (protected by SDL_AudioDeviceLock())
     struct sc_audiobuf buf;
@@ -80,6 +84,7 @@ struct sc_audio_player_callbacks {
 };
 
 void
-sc_audio_player_init(struct sc_audio_player *ap, sc_tick target_buffering);
+sc_audio_player_init(struct sc_audio_player *ap, sc_tick target_buffering,
+                     sc_tick audio_output_buffer);
 
 #endif