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OSX mixer

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This commit is contained in:
Matthew Leon
2017-08-21 17:10:12 +01:00
parent b0703b92c3
commit 5fb39658f1
7 changed files with 139 additions and 1 deletions
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57
src/output/plugins/OSXOutputPlugin.cxx
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@@ -20,6 +20,7 @@
#include "config.h"
#include "OSXOutputPlugin.hxx"
#include "../OutputAPI.hxx"
#include "mixer/MixerList.hxx"
#include "util/ScopeExit.hxx"
#include "util/RuntimeError.hxx"
#include "util/Domain.hxx"
@@ -53,6 +54,9 @@ struct OSXOutput {
boost::lockfree::spsc_queue<uint8_t> *ring_buffer;
OSXOutput(const ConfigBlock &block);
int GetVolume();
void SetVolume(unsigned new_volume);
};
static constexpr Domain osx_output_domain("osx_output");
@@ -103,6 +107,44 @@ OSXOutput::OSXOutput(const ConfigBlock &block)
sync_sample_rate = block.GetBlockValue("sync_sample_rate", false);
}
int
OSXOutput::GetVolume()
{
AudioUnitParameterValue dvolume;
char errormsg[1024];
OSStatus status = AudioUnitGetParameter(au, kHALOutputParam_Volume,
kAudioUnitScope_Global, 0, &dvolume);
if (status != noErr) {
osx_os_status_to_cstring(status, errormsg, sizeof(errormsg));
throw FormatRuntimeError("unable to get volume: %s", errormsg);
}
/* see the explanation in SetVolume, below */
return static_cast<int>(dvolume * dvolume * 100.0);
}
void
OSXOutput::SetVolume(unsigned new_volume) {
char errormsg[1024];
/* The scaling below makes shifts in volume greater at the lower end
* of the scale. This mimics the "feel" of physical volume levers. This is
* generally what users of audio software expect.
*/
AudioUnitParameterValue scaled_volume =
sqrt(static_cast<AudioUnitParameterValue>(new_volume) / 100.0);
OSStatus status = AudioUnitSetParameter(au, kHALOutputParam_Volume,
kAudioUnitScope_Global, 0, scaled_volume, 0);
if (status != noErr) {
osx_os_status_to_cstring(status, errormsg, sizeof(errormsg));
throw FormatRuntimeError( "unable to set new volume %u: %s",
new_volume, errormsg);
}
}
static AudioOutput *
osx_output_init(const ConfigBlock &block)
{
@@ -678,6 +720,18 @@ osx_output_delay(AudioOutput *ao) noexcept
: std::chrono::milliseconds(25);
}
int
osx_output_get_volume(OSXOutput &output)
{
return output.GetVolume();
}
void
osx_output_set_volume(OSXOutput &output, unsigned new_volume)
{
return output.SetVolume(new_volume);
}
const struct AudioOutputPlugin osx_output_plugin = {
"osx",
osx_output_test_default_device,
@@ -693,5 +747,6 @@ const struct AudioOutputPlugin osx_output_plugin = {
nullptr,
nullptr,
nullptr,
nullptr,
&osx_mixer_plugin,
};