internal/cbackend: add AudioBufferSizeInSeconds

hermunn · Dec 22, 2021 · e613189 · e613189
1 parent 1799ed0
commit e613189
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Showing 2 changed files with 7 additions and 2 deletions.
diff --git a/audio/internal/cbackend/context.go b/audio/internal/cbackend/context.go
@@ -71,8 +71,7 @@ func (c *Context) Err() error {
 }
 
 func (c *Context) oneBufferSize() int {
-	// TODO: This must be audio.oneBufferSize(p.context.sampleRate). Avoid the duplication.
-	return c.sampleRate * c.channelNum * c.bitDepthInBytes / 4
+	return int(float64(c.sampleRate*c.channelNum*c.bitDepthInBytes) * cbackend.AudioBufferSizeInSeconds())
 }
 
 func (c *Context) MaxBufferSize() int {

diff --git a/internal/cbackend/cbackend.go b/internal/cbackend/cbackend.go
@@ -51,6 +51,7 @@ package cbackend
 // void EbitenGetTouches(struct Touch* touches);
 //
 // // Audio
+// // TODO: Implement mixing on Go side and reduce the API.
 // typedef void (*OnWrittenCallback)(int id);
 // void EbitenOpenAudio(int sample_rate, int channel_num, int bit_depth_in_bytes);
 // void EbitenCloseAudio();
@@ -62,6 +63,7 @@ package cbackend
 // double EbitenAudioPlayerGetVolume(int id);
 // void EbitenAudioPlayerSetVolume(int id, double volume);
 // int EbitenAudioPlayerGetUnplayedBufferSize(int id);
+// float EbitenAudioBufferSizeInSeconds();
 //
 // void EbitenAudioPlayerOnWrittenCallback(int id);
 // static int EbitenCreateAudioPlayerProxy() {
@@ -187,6 +189,10 @@ func CreateAudioPlayer(onWritten func()) *AudioPlayer {
 	return p
 }
 
+func AudioBufferSizeInSeconds() float64 {
+	return float64(C.EbitenAudioBufferSizeInSeconds())
+}
+
 type AudioPlayer struct {
 	id C.int
 }