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-rw-r--r--drumgizmo/output/oss.cc55
-rw-r--r--drumgizmo/output/oss.h4
2 files changed, 57 insertions, 2 deletions
diff --git a/drumgizmo/output/oss.cc b/drumgizmo/output/oss.cc
index 4e02e97..ee13a84 100644
--- a/drumgizmo/output/oss.cc
+++ b/drumgizmo/output/oss.cc
@@ -38,6 +38,8 @@ OSSOutputEngine::OSSOutputEngine()
, srate{44100}
, format{AFMT_S32_NE}
, data{}
+ , max_fragments{4}
+ , fragment_size{8}
{
data.clear();
data.resize(1024 * num_channels);
@@ -45,7 +47,7 @@ OSSOutputEngine::OSSOutputEngine()
bool OSSOutputEngine::init(const Channels& channels)
{
- int tmp, mode = O_WRONLY;
+ int tmp, mode = O_WRONLY, fragments;
num_channels = channels.size();
if((fd = open(dev.data(), mode, 0)) == -1)
@@ -54,6 +56,14 @@ bool OSSOutputEngine::init(const Channels& channels)
return false;
}
+ fragments = max_fragments << 16 | fragment_size;
+ tmp = fragments;
+ if (ioctl(fd, SNDCTL_DSP_SETFRAGMENT, &tmp) == -1 || tmp != fragments)
+ {
+ perror("SNDCTL_DSP_SETFRAGMENT");
+ exit(-1);
+ }
+
tmp = format;
if(ioctl(fd, SNDCTL_DSP_SETFMT, &tmp) == -1 || tmp != format)
{
@@ -99,6 +109,44 @@ void OSSOutputEngine::setParm(const std::string& parm, const std::string& value)
std::cerr << value << std::endl;
}
}
+ else if(parm == "max_fragments")
+ {
+ try
+ {
+ max_fragments = std::stoi(value);
+ }
+ catch(...)
+ {
+ std::cerr << "[OSSOutputEngine] Invalid max_fragments ";
+ std::cerr << value << std::endl;
+ }
+ if(max_fragments < 2)
+ {
+ std::cerr << "[OSSoutputEngine] max_fragments must be at least 2\n";
+ std::cerr << "Setting max_fragments to 2" << std::endl;
+ max_fragments = 2;
+ }
+ }
+ else if(parm == "fragment_size")
+ {
+ try
+ {
+ fragment_size = std::stoi(value);
+ }
+ catch(...)
+ {
+ std::cerr << "[OSSOutputEngine] Invalid fragment_size ";
+ std::cerr << value << std::endl;
+ }
+ if(fragment_size < 4)
+ {
+ std::cerr << "[OSSoutputEngine] fragment_size must be at least 4\n";
+ std::cerr << "Setting fragment_size to 4 (";
+ fragment_size = 4;
+ auto fragment_byte_size = 1 << fragment_size;
+ std::cerr << fragment_byte_size << "Bytes)" << std::endl;
+ }
+ }
else
{
std::cerr << "[OSSOutputEngine] Unsupported parameter '";
@@ -106,6 +154,11 @@ void OSSOutputEngine::setParm(const std::string& parm, const std::string& value)
}
}
+void OSSOutputEngine::pre(size_t nsamples)
+{
+ data.resize(nsamples * num_channels);
+}
+
void OSSOutputEngine::run(int ch, sample_t* samples, size_t nsamples)
{
// Convert to int format and
diff --git a/drumgizmo/output/oss.h b/drumgizmo/output/oss.h
index d44cd1c..889021f 100644
--- a/drumgizmo/output/oss.h
+++ b/drumgizmo/output/oss.h
@@ -39,7 +39,7 @@ public:
void setParm(const std::string& parm, const std::string& value) override;
bool start() override { return true; };
void stop() override {};
- void pre(size_t nsamples) override { data.resize(nsamples * num_channels); };
+ void pre(size_t nsamples) override;
void run(int ch, sample_t* samples, size_t nsamples) override;
void post(size_t nsamples) override;
bool isFreewheeling() const override { return false; };
@@ -52,5 +52,7 @@ private:
std::size_t num_channels;
unsigned int srate;
unsigned int format;
+ unsigned int max_fragments;
+ unsigned int fragment_size;
std::vector<std::int32_t> data;
};