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/*
* PulseAudio host to play natively in Linux based systems without
* ALSA emulation
*
* Copyright (c) 2014-2023 Tuukka Pasanen <tuukka.pasanen@ilmi.fi>
* Copyright (c) 2016 Sqweek
*
* Based on the Open Source API proposed by Ross Bencina
* Copyright (c) 1999-2002 Ross Bencina, Phil Burk
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* The text above constitutes the entire PortAudio license; however,
* the PortAudio community also makes the following non-binding requests:
*
* Any person wishing to distribute modifications to the Software is
* requested to send the modifications to the original developer so that
* they can be incorporated into the canonical version. It is also
* requested that these non-binding requests be included along with the
* license above.
*/
/** @file
@ingroup common_src
@brief PulseAudio implementation of support for a host API.
This host API implements PulseAudio support for portaudio
it has callbackmode and normal write mode support
*/
#include "pa_linux_pulseaudio_block_internal.h"
#include <unistd.h>
/*
As separate stream interfaces are used for blocking and callback
streams, the following functions can be guaranteed to only be called
for blocking streams.
*/
PaError PaPulseAudio_ReadStreamBlock( PaStream * s,
void *buffer,
unsigned long frames )
{
PaPulseAudio_Stream *pulseaudioStream = (PaPulseAudio_Stream *) s;
PaPulseAudio_HostApiRepresentation *pulseaudioHostApi =
pulseaudioStream->hostapi;
PaError ret = 0;
uint8_t *readableBuffer = (uint8_t *) buffer;
long bufferLeftToRead = (frames * pulseaudioStream->inputFrameSize);
while( bufferLeftToRead > 0 )
{
PA_PULSEAUDIO_IS_ERROR( pulseaudioStream, paStreamIsStopped )
PaPulseAudio_Lock( pulseaudioStream->mainloop );
long l_read = PaUtil_ReadRingBuffer( &pulseaudioStream->inputRing, readableBuffer,
bufferLeftToRead );
readableBuffer += l_read;
bufferLeftToRead -= l_read;
if( bufferLeftToRead > 0 )
pa_threaded_mainloop_wait( pulseaudioStream->mainloop );
PaPulseAudio_UnLock( pulseaudioStream->mainloop );
if( bufferLeftToRead > 0 )
{
/* Sleep small amount of time not burn CPU
* we block anyway so this is bearable
*/
usleep(100);
}
}
return paNoError;
}
PaError PaPulseAudio_WriteStreamBlock( PaStream * s,
const void *buffer,
unsigned long frames )
{
PaPulseAudio_Stream *pulseaudioStream = (PaPulseAudio_Stream *) s;
int ret = 0;
size_t pulseaudioWritable = 0;
uint8_t *writableBuffer = (uint8_t *) buffer;
long bufferLeftToWrite = (frames * pulseaudioStream->outputFrameSize);
pa_operation *pulseaudioOperation = NULL;
PaUtil_BeginCpuLoadMeasurement( &pulseaudioStream->cpuLoadMeasurer );
while( bufferLeftToWrite > 0)
{
PA_PULSEAUDIO_IS_ERROR( pulseaudioStream, paStreamIsStopped )
PaPulseAudio_Lock( pulseaudioStream->mainloop );
pulseaudioWritable = pa_stream_writable_size( pulseaudioStream->outputStream );
PaPulseAudio_UnLock( pulseaudioStream->mainloop );
if( pulseaudioWritable > 0 )
{
if( bufferLeftToWrite < pulseaudioWritable )
{
pulseaudioWritable = bufferLeftToWrite;
}
PaPulseAudio_Lock( pulseaudioStream->mainloop );
ret = pa_stream_write( pulseaudioStream->outputStream,
writableBuffer,
pulseaudioWritable,
NULL,
0,
PA_SEEK_RELATIVE );
pulseaudioOperation = pa_stream_update_timing_info( pulseaudioStream->outputStream,
NULL,
NULL );
PaPulseAudio_UnLock( pulseaudioStream->mainloop );
ret = 0;
if( pulseaudioOperation == NULL )
{
return paInsufficientMemory;
}
while( pa_operation_get_state( pulseaudioOperation ) == PA_OPERATION_RUNNING )
{
ret ++;
PA_PULSEAUDIO_IS_ERROR( pulseaudioStream, paStreamIsStopped )
/* As this shouldn never happen it's error if it does */
if( ret >= 10000 )
{
return paStreamIsStopped;
}
usleep(100);
}
PaPulseAudio_Lock( pulseaudioStream->mainloop );
pa_operation_unref( pulseaudioOperation );
pulseaudioOperation = NULL;
PaPulseAudio_UnLock( pulseaudioStream->mainloop );
writableBuffer += pulseaudioWritable;
bufferLeftToWrite -= pulseaudioWritable;
}
if( bufferLeftToWrite > 0 )
{
/* Sleep small amount of time not burn CPU
* we block anyway so this is bearable
*/
usleep(100);
}
}
PaUtil_EndCpuLoadMeasurement( &pulseaudioStream->cpuLoadMeasurer,
frames );
return paNoError;
}
signed long PaPulseAudio_GetStreamReadAvailableBlock( PaStream * s )
{
PaPulseAudio_Stream *pulseaudioStream = (PaPulseAudio_Stream *) s;
if( pulseaudioStream->inputStream == NULL )
{
return 0;
}
return ( PaUtil_GetRingBufferReadAvailable( &pulseaudioStream->inputRing ) /
pulseaudioStream->inputFrameSize );
}
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