// Submits any buffers that have currently been queued,
// assuming they are needed based on current queue depth
void sound_xaudio2::submit_needed()
{
XAUDIO2_VOICE_STATE state;
m_sourceVoice->GetState(&state, XAUDIO2_VOICE_NOSAMPLESPLAYED);
std::lock_guard<std::mutex> lock(m_buffer_lock);
// If we have buffers queued into XAudio and our current in-memory buffer
// isn't yet full, there's no need to submit it
if (state.BuffersQueued >= 1 && m_queue.empty())
return;
// We do however want to achieve some kind of minimal latency, so if the queued buffers
// are greater than 2, flush them to re-sync the audio
if (state.BuffersQueued > 2)
{
m_sourceVoice->FlushSourceBuffers();
m_overflows++;
}
// Roll the buffer
roll_buffer();
// Submit the next buffer
submit_next_queued();
}
void sound_xaudio2::update_audio_stream(
bool is_throttled,
INT16 const *buffer,
int samples_this_frame)
{
if ((sample_rate() == 0) || !m_buffer)
return;
UINT32 const bytes_this_frame = samples_this_frame * m_sample_bytes;
std::lock_guard<std::mutex> lock(m_buffer_lock);
UINT32 bytes_left = bytes_this_frame;
while (bytes_left > 0)
{
UINT32 chunk = MIN(m_buffer_size, bytes_left);
// Roll the buffer if needed
if (m_writepos + chunk >= m_buffer_size)
{
roll_buffer();
}
// Copy in the data
memcpy(m_buffer.get() + m_writepos, buffer, chunk);
m_writepos += chunk;
bytes_left -= chunk;
}
// Signal data available
SetEvent(m_hEventDataAvailable);
}
void sound_xaudio2::update_audio_stream(
bool is_throttled,
int16_t const *buffer,
int samples_this_frame)
{
if (!m_initialized || sample_rate() == 0 || !m_buffer)
return;
uint32_t const bytes_this_frame = samples_this_frame * m_sample_bytes;
std::lock_guard<std::mutex> lock(m_buffer_lock);
uint32_t bytes_left = bytes_this_frame;
while (bytes_left > 0)
{
uint32_t chunk = std::min(uint32_t(m_buffer_size), bytes_left);
// Roll the buffer if needed
if (m_writepos + chunk >= m_buffer_size)
{
roll_buffer();
}
// Copy in the data
memcpy(m_buffer.get() + m_writepos, buffer, chunk);
m_writepos += chunk;
bytes_left -= chunk;
}
// Signal data available
SetEvent(m_hEventDataAvailable);
}
// Submits any buffers that have currently been queued,
// assuming they are needed based on current queue depth
void sound_xaudio2::submit_needed()
{
XAUDIO2_VOICE_STATE state;
m_sourceVoice->GetState(&state, XAUDIO2_VOICE_NOSAMPLESPLAYED);
// If we have a buffer on the queue, no reason to submit
if (state.BuffersQueued >= 1)
return;
std::lock_guard<std::mutex> lock(m_buffer_lock);
// Roll the buffer
roll_buffer();
// Submit the next buffer
submit_next_queued();
}
