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AudioStream: Add option to wait until a full buffer is queued

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This commit is contained in:
Connor McLaughlin 2021-01-28 20:12:24 +10:00
parent 9316ce532b
commit 4e583890ea
2 changed files with 28 additions and 3 deletions
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28
src/common/audio_stream.cpp
View file

@ -27,6 +27,7 @@ bool AudioStream::Reconfigure(u32 input_sample_rate /* = DefaultInputSampleRate
m_output_sample_rate = output_sample_rate;
m_channels = channels;
m_buffer_size = buffer_size;
m_buffer_filling.store(m_wait_for_buffer_fill);
m_output_paused = true;
if (!SetBufferSize(buffer_size))
@ -55,6 +56,14 @@ void AudioStream::SetInputSampleRate(u32 sample_rate)
InternalSetInputSampleRate(sample_rate);
}
void AudioStream::SetWaitForBufferFill(bool enabled)
{
std::unique_lock<std::mutex> buffer_lock(m_buffer_mutex);
m_wait_for_buffer_fill = enabled;
if (enabled && m_buffer.IsEmpty())
m_buffer_filling.store(true);
}
void AudioStream::InternalSetInputSampleRate(u32 sample_rate)
{
if (m_input_sample_rate == sample_rate)
@ -123,6 +132,11 @@ void AudioStream::WriteFrames(const SampleType* frames, u32 num_frames)
void AudioStream::EndWrite(u32 num_frames)
{
m_buffer.AdvanceTail(num_frames * m_channels);
if (m_buffer_filling.load())
{
if ((m_buffer.GetSize() / m_channels) >= m_buffer_size)
m_buffer_filling.store(false);
}
m_buffer_mutex.unlock();
FramesAvailable();
}
@ -165,8 +179,9 @@ void AudioStream::ReadFrames(SampleType* samples, u32 num_frames, bool apply_vol
{
const u32 total_samples = num_frames * m_channels;
u32 samples_copied = 0;
{
std::unique_lock<std::mutex> buffer_lock(m_buffer_mutex);
if (!m_buffer_filling.load())
{
if (m_input_sample_rate == m_output_sample_rate)
{
samples_copied = std::min(m_buffer.GetSize(), total_samples);
@ -187,6 +202,10 @@ void AudioStream::ReadFrames(SampleType* samples, u32 num_frames, bool apply_vol
m_resampled_buffer.PopRange(samples, samples_copied);
}
}
else
{
ReleaseBufferLock(std::move(buffer_lock));
}
if (samples_copied < total_samples)
{
@ -214,16 +233,18 @@ void AudioStream::ReadFrames(SampleType* samples, u32 num_frames, bool apply_vol
resample_subpos %= 65536u;
}
Log_DevPrintf("Audio buffer underflow, resampled %u frames to %u", samples_copied / m_channels, num_frames);
Log_VerbosePrintf("Audio buffer underflow, resampled %u frames to %u", samples_copied / m_channels, num_frames);
m_underflow_flag.store(true);
}
else
{
// read nothing, so zero-fill
std::memset(samples, 0, sizeof(SampleType) * total_samples);
Log_DevPrintf("Audio buffer underflow with no samples, added %u frames silence", num_frames);
Log_VerbosePrintf("Audio buffer underflow with no samples, added %u frames silence", num_frames);
m_underflow_flag.store(true);
}
m_buffer_filling.store(m_wait_for_buffer_fill);
}
if (apply_volume && m_output_volume != FullVolume)
@ -267,6 +288,7 @@ void AudioStream::EmptyBuffers()
std::unique_lock<std::mutex> resampler_lock(m_resampler_mutex);
m_buffer.Clear();
m_underflow_flag.store(false);
m_buffer_filling.store(m_wait_for_buffer_fill);
ResetResampler();
}

3
src/common/audio_stream.h
View file

@ -37,6 +37,7 @@ public:
void SetSync(bool enable) { m_sync = enable; }
void SetInputSampleRate(u32 sample_rate);
void SetWaitForBufferFill(bool enabled);
virtual void SetOutputVolume(u32 volume);
@ -109,10 +110,12 @@ private:
std::vector<SampleType> m_resample_buffer;
std::atomic_bool m_underflow_flag{false};
std::atomic_bool m_buffer_filling{false};
u32 m_max_samples = 0;
bool m_output_paused = true;
bool m_sync = true;
bool m_wait_for_buffer_fill = false;
// Resampling
double m_resampler_ratio = 1.0;