void SoundCardPMO::WorkerThread(void)
{
void *pBuffer;
Error eErr;
size_t iRet;
Event *pEvent;
audio_buf_info info;
bool bPerfWarn = false;
// Don't do anything until resume is called.
m_pPauseSem->Wait();
//CheckForBufferUp();
// Wait a specified prebuffer time...
PreBuffer();
for(; !m_bExit;)
{
if (m_bPause)
{
m_pPauseSem->Wait();
continue;
}
// Loop until we get an Init event from the LMC
if (!m_properlyInitialized)
{
pEvent = ((EventBuffer *)m_pInputBuffer)->GetEvent();
if (pEvent == NULL)
{
m_pLmc->Wake();
WasteTime();
continue;
}
if (pEvent->Type() == PMO_Init)
{
if (IsError(Init(((PMOInitEvent *)pEvent)->GetInfo())))
{
delete pEvent;
break;
}
}
delete pEvent;
continue;
}
// Set up reading a block from the buffer. If not enough bytes are
// available, sleep for a little while and try again.
for(;;)
{
eErr = ((EventBuffer *)m_pInputBuffer)->BeginRead(pBuffer,
m_iDataSize);
if (eErr == kError_EndOfStream || eErr == kError_Interrupt)
break;
if (eErr == kError_NoDataAvail)
{
m_pLmc->Wake();
CheckForBufferUp();
if (!bPerfWarn)
{
time_t t;
time(&t);
m_pContext->log->Log(LogPerf, "Output buffer underflow: %s",
ctime(&t));
bPerfWarn = true;
}
WasteTime();
continue;
}
// Is there an event pending that we need to take care of
// before we play this block of samples?
if (eErr == kError_EventPending)
{
pEvent = ((EventBuffer *)m_pInputBuffer)->PeekEvent();
if (pEvent == NULL)
continue;
if (pEvent->Type() == PMO_Quit &&
((EventBuffer *)m_pInputBuffer)->GetNumBytesInBuffer() > 0)
{
if (WaitForDrain())
{
m_pTarget->AcceptEvent(new Event(INFO_DoneOutputting));
return;
}
continue;
}
pEvent = ((EventBuffer *)m_pInputBuffer)->GetEvent();
if (pEvent->Type() == PMO_Init)
Init(((PMOInitEvent *)pEvent)->GetInfo());
if (pEvent->Type() == PMO_Reset)
Reset(false);
if (pEvent->Type() == PMO_Info)
HandleTimeInfoEvent((PMOTimeInfoEvent *)pEvent);
if (pEvent->Type() == PMO_Quit)
{
delete pEvent;
m_pTarget->AcceptEvent(new Event(INFO_DoneOutputting));
return;
}
delete pEvent;
continue;
}
if (IsError(eErr))
{
ReportError("Internal error occured.");
m_pContext->log->Error("Cannot read from buffer in PMO "
"worker tread: %d\n", eErr);
break;
}
bPerfWarn = false;
break;
}
if (m_bExit || m_bPause)
{
m_pInputBuffer->EndRead(0);
continue;
}
iRet = ALwritesamps(outaudioport, pBuffer, m_iDataSize);
if ((int)iRet < 0)
{
m_pInputBuffer->EndRead(0);
ReportError("Could not write sound data to the soundcard.");
m_pContext->log->Error("Failed to write to the soundcard: %s\n",
strerror(errno));
break;
}
m_iTotalBytesWritten += iRet;
m_pInputBuffer->EndRead(iRet);
m_pLmc->Wake();
UpdateBufferStatus();
}
}
void AlsaPMO::WorkerThread(void)
{
void *pBuffer;
Error eErr;
int iRet = -1;
Event *pEvent;
snd_pcm_channel_status_t ainfo;
// Don't do anything until resume is called.
m_pPauseSem->Wait();
// Sleep for a pre buffer period
PreBuffer();
// The following should be abstracted out into the general thread
// classes:
#ifdef __linux__
struct sched_param sParam;
sParam.sched_priority = sched_get_priority_max(SCHED_OTHER);
pthread_setschedparam(pthread_self(), SCHED_OTHER, &sParam);
#endif
ainfo.channel = SND_PCM_CHANNEL_PLAYBACK;
for(; !m_bExit;)
{
if (m_bPause)
{
m_pPauseSem->Wait();
continue;
}
// Loop until we get an Init event from the LMC
if (!m_properlyInitialized)
{
pEvent = ((EventBuffer *)m_pInputBuffer)->GetEvent();
if (pEvent == NULL)
{
m_pLmc->Wake();
WasteTime();
continue;
}
if (pEvent->Type() == PMO_Init)
{
if (IsError(Init(((PMOInitEvent *)pEvent)->GetInfo())))
{
delete pEvent;
break;
}
}
delete pEvent;
continue;
}
// Set up reading a block from the buffer. If not enough bytes are
// available, sleep for a little while and try again.
for(;;)
{
eErr = ((EventBuffer *)m_pInputBuffer)->BeginRead(pBuffer,
m_iDataSize);
if (eErr == kError_EndOfStream || eErr == kError_Interrupt)
break;
if (eErr == kError_NoDataAvail)
{
m_pLmc->Wake();
CheckForBufferUp();
WasteTime();
continue;
}
// Is there an event pending that we need to take care of
// before we play this block of samples?
if (eErr == kError_EventPending)
{
pEvent = ((EventBuffer *)m_pInputBuffer)->PeekEvent();
if (pEvent == NULL)
continue;
if (pEvent->Type() == PMO_Quit &&
((EventBuffer *)m_pInputBuffer)->GetNumBytesInBuffer() > 0)
{
if (WaitForDrain())
{
Reset(true);
m_pTarget->AcceptEvent(new Event(INFO_DoneOutputting));
return;
}
continue;
}
pEvent = ((EventBuffer *)m_pInputBuffer)->GetEvent();
if (pEvent->Type() == PMO_Init)
Init(((PMOInitEvent *)pEvent)->GetInfo());
if (pEvent->Type() == PMO_Reset)
Reset(false);
if (pEvent->Type() == PMO_Info)
HandleTimeInfoEvent((PMOTimeInfoEvent *)pEvent);
if (pEvent->Type() == PMO_Quit)
{
delete pEvent;
m_pTarget->AcceptEvent(new Event(INFO_DoneOutputting));
return;
}
delete pEvent;
continue;
}
if (IsError(eErr))
{
ReportError("Internal error occured.");
m_pContext->log->Error("Cannot read from buffer in PMO "
"worker tread: %d\n", eErr);
break;
}
break;
}
// Now write the block to the audio device. If the block doesn't
// all fit, pause and loop until the entire block has been played.
// This loop could be written using non-blocking io...
for(;!m_bExit && !m_bPause;)
{
iRet = snd_pcm_write(m_handle,pBuffer,m_iDataSize);
if (iRet == -EAGAIN)
{
CheckForBufferUp();
WasteTime();
continue;
}
if (iRet == -EIO)
{
snd_pcm_channel_prepare(m_handle, SND_PCM_CHANNEL_PLAYBACK);
continue;
}
break;
}
if (m_bExit)
{
m_pInputBuffer->EndRead(0);
return;
}
if (m_bPause)
{
if (iRet == -EAGAIN)
m_pInputBuffer->EndRead(0);
else
{
m_pInputBuffer->EndRead(iRet);
UpdateBufferStatus();
}
continue;
}
if (iRet < 0)
{
m_pInputBuffer->EndRead(0);
ReportError("Could not write sound data to the soundcard.");
m_pContext->log->Error("Failed to write to the soundcard: %s\n",
strerror(errno));
break;
}
m_pInputBuffer->EndRead(iRet);
m_pLmc->Wake();
UpdateBufferStatus();
}
}
void PhysicalMediaOutput::PreBuffer(void)
{
m_pLmc->Wake();
CheckForBufferUp();
usleep(m_iPreBuffer * 1000);
}