Get OSS buffer size

2 files changed, 12 insertions, 1 deletions

diff --git a/drumgizmo/output/oss.cc b/drumgizmo/output/oss.cc
index ee13a84..9815460 100644
--- a/drumgizmo/output/oss.cc
+++ b/drumgizmo/output/oss.cc
@@ -40,6 +40,7 @@ OSSOutputEngine::OSSOutputEngine()
 	, data{}
 	, max_fragments{4}
 	, fragment_size{8}
+	, buffer_size{1024}
 {
 	data.clear();
 	data.resize(1024 * num_channels);
@@ -64,6 +65,15 @@ bool OSSOutputEngine::init(const Channels& channels)
 		exit(-1);
 	}
 
+	audio_buf_info info;
+	if(ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
+	{
+		std::cerr << "Can not get buffer info: ";
+		std::cerr << std::strerror(errno) << std::endl;
+		return false;
+	}
+	buffer_size = info.bytes / 4;
+
 	tmp = format;
 	if(ioctl(fd, SNDCTL_DSP_SETFMT, &tmp) == -1 || tmp != format)
 	{
@@ -195,7 +205,7 @@ void OSSOutputEngine::post(size_t nsamples)
 
 std::size_t OSSOutputEngine::getBufferSize() const
 {
-	return data.size() / num_channels;
+	return buffer_size;
 }
 
 std::size_t OSSOutputEngine::getSamplerate() const
diff --git a/drumgizmo/output/oss.h b/drumgizmo/output/oss.h
index 889021f..1233ec1 100644
--- a/drumgizmo/output/oss.h
+++ b/drumgizmo/output/oss.h
@@ -54,5 +54,6 @@ private:
 	unsigned int format;
 	unsigned int max_fragments;
 	unsigned int fragment_size;
+	unsigned int buffer_size;
 	std::vector<std::int32_t> data;
 };