int RageSoundReader_Split::Read( float *pBuf, int iFrames )
{
m_iRequestFrames = iFrames;
int iRet = m_pImpl->ReadBuffer();
int iSamplesAvailable = m_pImpl->m_sBuffer.size();
const float *pSrc = &m_pImpl->m_sBuffer[0];
if( m_pImpl->m_iBufferPositionFrames < m_iPositionFrame )
{
int iSkipFrames = m_iPositionFrame - m_pImpl->m_iBufferPositionFrames;
int iSkipSamples = iSkipFrames * m_pImpl->m_pSource->GetNumChannels();
pSrc += iSkipSamples;
iSamplesAvailable -= iSkipSamples;
}
int iFramesWanted = iFrames;
int iFramesAvailable = iSamplesAvailable / (m_pImpl->m_pSource->GetNumChannels());
/* Report any errors from Read() if we don't have any data buffered to
* return. If we do have data, finish returning it first. */
if( iFramesAvailable == 0 && iRet < 0 )
return iRet;
iFramesAvailable = min( iFramesAvailable, iFramesWanted );
{
RageSoundMixBuffer mix;
for( int i = 0; i < (int) m_aChannels.size(); ++i )
{
const ChannelMap &chan = m_aChannels[i];
mix.SetWriteOffset( chan.m_iToChannel );
mix.write( pSrc + chan.m_iFromChannel, iFramesAvailable, m_pImpl->m_pSource->GetNumChannels(), m_iNumOutputChannels );
}
mix.read( pBuf );
}
m_iPositionFrame += iFramesAvailable;
/* We no longer need the data we requested. Clear our request, so the
* memory can be freed. */
m_iRequestFrames = 0;
m_pImpl->ReadBuffer();
return iFramesAvailable;
}
RageSoundMixBuffer &RageSoundDriver::MixIntoBuffer( int iFrames, int64_t iFrameNumber, int64_t iCurrentFrame )
{
ASSERT_M( m_DecodeThread.IsCreated(), "RageSoundDriver::StartDecodeThread() was never called" );
if( iFrameNumber - iCurrentFrame + iFrames > 0 )
{
g_iTotalAhead += (int) (iFrameNumber - iCurrentFrame + iFrames);
++g_iTotalAheadCount;
}
static RageSoundMixBuffer mix;
for( unsigned i = 0; i < ARRAYLEN(m_Sounds); ++i )
{
/* s.m_pSound can not safely be accessed from here. */
Sound &s = m_Sounds[i];
if( s.m_State == Sound::HALTING )
{
/* This indicates that this stream can be reused. */
s.m_bPaused = false;
s.m_State = Sound::STOPPED;
// LOG->Trace("set %p from HALTING to STOPPED", m_Sounds[i].m_pSound);
continue;
}
if( s.m_State != Sound::STOPPING && s.m_State != Sound::PLAYING )
continue;
/* STOPPING or PLAYING. Read sound data. */
if( m_Sounds[i].m_bPaused )
continue;
int iGotFrames = 0;
int iFramesLeft = iFrames;
/* Does the sound have a start time? */
if( !s.m_StartTime.IsZero() && iCurrentFrame != -1 )
{
/* If the sound is supposed to start at a time past this buffer, insert silence. */
const int64_t iFramesUntilThisBuffer = iFrameNumber - iCurrentFrame;
const float fSecondsBeforeStart = -s.m_StartTime.Ago();
const int64_t iFramesBeforeStart = int64_t(fSecondsBeforeStart * GetSampleRate());
const int iSilentFramesInThisBuffer = clamp( int(iFramesBeforeStart-iFramesUntilThisBuffer), 0, iFramesLeft );
iGotFrames += iSilentFramesInThisBuffer;
iFramesLeft -= iSilentFramesInThisBuffer;
/* If we didn't completely fill the buffer, then we've written all of the silence. */
if( iFramesLeft )
s.m_StartTime.SetZero();
}
/* Fill actual data. */
sound_block *p[2];
unsigned pSize[2];
s.m_Buffer.get_read_pointers( p, pSize );
while( iFramesLeft && pSize[0] )
{
if( !p[0]->m_FramesInBuffer )
{
/* We've processed all of the sound in this block. Mark it read. */
s.m_Buffer.advance_read_pointer( 1 );
++p[0];
--pSize[0];
/* If we have more data in p[0], keep going. */
if( pSize[0] )
continue; // more data
/* We've used up p[0]. Try p[1]. */
swap( p[0], p[1] );
swap( pSize[0], pSize[1] );
continue;
}
/* Note that, until we call advance_read_pointer, we can safely write to p[0]. */
const int frames_to_read = min( iFramesLeft, p[0]->m_FramesInBuffer );
mix.SetWriteOffset( iGotFrames*channels );
mix.write( p[0]->m_BufferNext, frames_to_read * channels );
{
Sound::QueuedPosMap pos;
pos.iStreamFrame = iFrameNumber+iGotFrames;
pos.iHardwareFrame = p[0]->m_iPosition;
pos.iFrames = frames_to_read;
s.m_PosMapQueue.write( &pos, 1 );
}
p[0]->m_BufferNext += frames_to_read*channels;
p[0]->m_FramesInBuffer -= frames_to_read;
p[0]->m_iPosition += frames_to_read;
// LOG->Trace( "incr fr rd += %i (state %i) (%p)",
// (int) frames_to_read, s.m_State, s.m_pSound );
iGotFrames += frames_to_read;
iFramesLeft -= frames_to_read;
}
/* If we don't have enough to fill the buffer, we've underrun. */
if( iGotFrames < iFrames && s.m_State == Sound::PLAYING )
++underruns;
}
return mix;
}