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the AudioUnit is happier if we don't stop it for silence (nw)

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This commit is contained in:
Vas Crabb 2015-04-05 02:38:41 +11:00
parent 18ec0951bd
commit bec996831e
1 changed files with 3 additions and 26 deletions
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29
src/osd/modules/sound/coreaudio_sound.c
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@ -26,7 +26,6 @@ public:
osd_module(OSD_SOUND_PROVIDER, "coreaudio"),
sound_module(),
m_open(false),
m_started(false),
m_attenuation(0),
m_scale(128),
m_sample_bytes(0),
@ -87,10 +86,9 @@ private:
AudioBufferList *data);
bool m_open;
bool m_started;
AudioUnit m_output;
int m_attenuation;
UINT32 m_scale;
INT32 m_scale;
UINT32 m_sample_bytes;
UINT32 m_headroom;
UINT32 m_buffer_size;
@ -200,7 +198,6 @@ int sound_coreaudio::init()
return -1;
}
m_open = true;
m_started = true;
osd_printf_verbose("Audio: End initialization\n");
return 0;
}
@ -215,7 +212,6 @@ void sound_coreaudio::exit()
AudioUnitUninitialize(m_output);
CloseComponent(m_output);
m_open = false;
m_started = false;
}
if (m_buffer)
{
@ -257,27 +253,8 @@ void sound_coreaudio::update_audio_stream(bool is_throttled, INT16 const *buffer
void sound_coreaudio::set_mastervolume(int attenuation)
{
m_attenuation = MAX(MIN(attenuation, 0), -32);
m_scale = (UINT32)(pow(10.0, m_attenuation / 20.0) * 128);
if (m_open)
{
if (-32 == m_attenuation)
{
if (m_started)
{
if (noErr == AudioOutputUnitStop(m_output))
m_started = false;
}
}
else
{
if (!m_started)
{
if (noErr == AudioOutputUnitStart(m_output))
m_started = true;
}
}
}
m_attenuation = MAX(MIN(attenuation, 0), -32);
m_scale = (-32 == m_attenuation) ? 0 : (INT32)(pow(10.0, m_attenuation / 20.0) * 128);
}