jamulus/linux/sound.cpp

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/******************************************************************************\
* Copyright (c) 2004-2009
*
* Author(s):
* Volker Fischer
*
* This code is based on the simple_client example of the Jack audio interface.
\******************************************************************************/
#include "sound.h"
#ifdef WITH_SOUND
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void CSound::OpenJack()
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{
jack_status_t JackStatus;
// try to become a client of the JACK server
pJackClient = jack_client_open ( "llcon", JackNullOption, &JackStatus );
if ( pJackClient == NULL )
{
throw CGenErr ( tr ( "Jack server not running" ) );
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}
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// tell the JACK server to call "process()" whenever
// there is work to be done
jack_set_process_callback ( pJackClient, process, this );
// register a "buffer size changed" callback function
jack_set_buffer_size_callback ( pJackClient, bufferSizeCallback, this );
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// register shutdown callback function
jack_on_shutdown ( pJackClient, shutdownCallback, this );
// TEST check sample rate, if not correct, just fire error
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if ( jack_get_sample_rate ( pJackClient ) != SYSTEM_SAMPLE_RATE )
{
throw CGenErr ( tr ( "Jack server sample rate is different from "
"required one" ) );
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}
// create four ports (two for input, two for output -> stereo)
input_port_left = jack_port_register ( pJackClient, "input left",
JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0 );
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input_port_right = jack_port_register ( pJackClient, "input right",
JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0 );
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output_port_left = jack_port_register ( pJackClient, "output left",
JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0 );
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output_port_right = jack_port_register ( pJackClient, "output right",
JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0 );
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const char** ports;
// tell the JACK server that we are ready to roll
if ( jack_activate ( pJackClient ) )
{
throw CGenErr ( tr ( "Cannot activate client" ) );
}
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// connect the ports, note: you cannot do this before
// the client is activated, because we cannot allow
// connections to be made to clients that are not
// running
if ( ( ports = jack_get_ports ( pJackClient, NULL, NULL,
JackPortIsPhysical | JackPortIsOutput ) ) == NULL )
{
throw CGenErr ( tr ( "Cannot find any physical capture ports" ) );
}
if ( !ports[1] )
{
throw CGenErr ( tr ( "Cannot find enough physical capture ports" ) );
}
if ( jack_connect ( pJackClient, ports[0], jack_port_name ( input_port_left ) ) )
{
throw CGenErr ( tr ( "Cannot connect input ports" ) );
}
if ( jack_connect ( pJackClient, ports[1], jack_port_name ( input_port_right ) ) )
{
throw CGenErr ( tr ( "Cannot connect input ports" ) );
}
free ( ports );
if ( ( ports = jack_get_ports ( pJackClient, NULL, NULL,
JackPortIsPhysical | JackPortIsInput ) ) == NULL )
{
throw CGenErr ( tr ( "Cannot find any physical playback ports" ) );
}
if ( !ports[1] )
{
throw CGenErr ( tr ( "Cannot find enough physical playback ports" ) );
}
if ( jack_connect ( pJackClient, jack_port_name ( output_port_left ), ports[0] ) )
{
throw CGenErr ( tr ( "Cannot connect output ports" ) );
}
if ( jack_connect ( pJackClient, jack_port_name ( output_port_right ), ports[1] ) )
{
throw CGenErr ( tr ( "Cannot connect output ports" ) );
}
free ( ports );
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}
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void CSound::CloseJack()
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{
// deactivate client
jack_deactivate ( pJackClient );
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// unregister ports
jack_port_unregister ( pJackClient, input_port_left );
jack_port_unregister ( pJackClient, input_port_right );
jack_port_unregister ( pJackClient, output_port_left );
jack_port_unregister ( pJackClient, output_port_right );
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// close client connection to jack server
jack_client_close ( pJackClient );
}
void CSound::Start()
{
// call base class
CSoundBase::Start();
}
void CSound::Stop()
{
// call base class
CSoundBase::Stop();
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}
int CSound::Init ( const int iNewPrefMonoBufferSize )
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{
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// try setting buffer size
// TODO seems not to work! -> no audio after this operation!
//jack_set_buffer_size ( pJackClient, iNewPrefMonoBufferSize );
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// get actual buffer size
iJACKBufferSizeMono = jack_get_buffer_size ( pJackClient );
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// init base clasee
CSoundBase::Init ( iJACKBufferSizeMono );
// set internal buffer size value and calculate stereo buffer size
iJACKBufferSizeStero = 2 * iJACKBufferSizeMono;
// create memory for intermediate audio buffer
vecsTmpAudioSndCrdStereo.Init ( iJACKBufferSizeStero );
return iJACKBufferSizeMono;
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}
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// JACK callbacks --------------------------------------------------------------
int CSound::process ( jack_nframes_t nframes, void* arg )
{
CSound* pSound = reinterpret_cast<CSound*> ( arg );
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int i;
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if ( pSound->IsRunning() )
{
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// get input data pointer
jack_default_audio_sample_t* in_left =
(jack_default_audio_sample_t*) jack_port_get_buffer (
pSound->input_port_left, nframes );
jack_default_audio_sample_t* in_right =
(jack_default_audio_sample_t*) jack_port_get_buffer (
pSound->input_port_right, nframes );
// copy input data
for ( i = 0; i < pSound->iJACKBufferSizeMono; i++ )
{
pSound->vecsTmpAudioSndCrdStereo[2 * i] = (short) ( in_left[i] * _MAXSHORT );
pSound->vecsTmpAudioSndCrdStereo[2 * i + 1] = (short) ( in_right[i] * _MAXSHORT );
}
// call processing callback function
pSound->ProcessCallback ( pSound->vecsTmpAudioSndCrdStereo );
// get output data pointer
jack_default_audio_sample_t* out_left =
(jack_default_audio_sample_t*) jack_port_get_buffer (
pSound->output_port_left, nframes );
jack_default_audio_sample_t* out_right =
(jack_default_audio_sample_t*) jack_port_get_buffer (
pSound->output_port_right, nframes );
// copy output data
for ( i = 0; i < pSound->iJACKBufferSizeMono; i++ )
{
out_left[i] = (jack_default_audio_sample_t)
pSound->vecsTmpAudioSndCrdStereo[2 * i] / _MAXSHORT;
out_right[i] = (jack_default_audio_sample_t)
pSound->vecsTmpAudioSndCrdStereo[2 * i + 1] / _MAXSHORT;
}
}
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else
{
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// get output data pointer
jack_default_audio_sample_t* out_left =
(jack_default_audio_sample_t*) jack_port_get_buffer (
pSound->output_port_left, nframes );
jack_default_audio_sample_t* out_right =
(jack_default_audio_sample_t*) jack_port_get_buffer (
pSound->output_port_right, nframes );
// clear output data
for ( i = 0; i < pSound->iJACKBufferSizeMono; i++ )
{
out_left[i] = 0;
out_right[i] = 0;
}
}
return 0; // zero on success, non-zero on error
}
int CSound::bufferSizeCallback ( jack_nframes_t nframes, void *arg )
{
CSound* pSound = reinterpret_cast<CSound*> ( arg );
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pSound->EmitReinitRequestSignal();
return 0; // zero on success, non-zero on error
}
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void CSound::shutdownCallback ( void *arg )
{
// without a Jack server, our software makes no sense to run, throw
// error message
throw CGenErr ( tr ( "Jack server was shut down" ) );
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}
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#endif // WITH_SOUND