jamulus/linux/sound.cpp

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/******************************************************************************\
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* Copyright (c) 2004-2015
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*
* Author(s):
* Volker Fischer
*
* This code is based on the simple_client example of the Jack audio interface.
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*
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******************************************************************************
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
\******************************************************************************/
#include "sound.h"
#ifdef WITH_SOUND
void CSound::OpenJack()
{
jack_status_t JackStatus;
// try to become a client of the JACK server
pJackClient = jack_client_open ( APP_NAME, JackNullOption, &JackStatus );
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if ( pJackClient == NULL )
{
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throw CGenErr ( tr ( "The Jack server is not running. This software "
"requires a Jack server to run. Normally if the Jack server is "
"not running this software will automatically start the Jack server. "
"It seems that this auto start has not worked. Try to start the Jack "
"server manually." ) );
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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 );
// register shutdown callback function
jack_on_shutdown ( pJackClient, shutdownCallback, this );
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// check sample rate, if not correct, just fire error
if ( jack_get_sample_rate ( pJackClient ) != SYSTEM_SAMPLE_RATE_HZ )
{
throw CGenErr ( tr ( "The Jack server sample rate is different from "
"the required one. The required sample rate is: <b>" ) +
QString().setNum ( SYSTEM_SAMPLE_RATE_HZ ) + tr ( " Hz</b>. You can "
"use a tool like <i><a href=""http://qjackctl.sourceforge.net"">QJackCtl</a></i> "
"to adjust the Jack server sample rate.<br>Make sure to set the "
"<b>Frames/Period</b> to a low value like <b>" ) +
QString().setNum ( SYSTEM_FRAME_SIZE_SAMPLES * FRAME_SIZE_FACTOR_PREFERRED ) +
tr ( "</b> to achieve a low delay." ) );
}
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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 );
input_port_right = jack_port_register ( pJackClient, "input right",
JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0 );
output_port_left = jack_port_register ( pJackClient, "output left",
JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0 );
output_port_right = jack_port_register ( pJackClient, "output right",
JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0 );
if ( ( input_port_left == NULL ) ||
( input_port_right == NULL ) ||
( output_port_left == NULL ) ||
( output_port_right == NULL ) )
{
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throw CGenErr ( tr ( "The Jack port registering failed." ) );
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}
const char** ports;
// tell the JACK server that we are ready to roll
if ( jack_activate ( pJackClient ) )
{
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throw CGenErr ( tr ( "Cannot activate the Jack 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
// try to connect physical input ports
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if ( ( ports = jack_get_ports ( pJackClient,
NULL,
NULL,
JackPortIsPhysical | JackPortIsOutput ) ) != NULL )
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{
if ( jack_connect ( pJackClient, ports[0], jack_port_name ( input_port_left ) ) )
{
throw CGenErr ( tr ( "Cannot connect the Jack input ports" ) );
}
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// before connecting the second stereo channel, check if the input is not
// mono
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// TODO who checks if ports[1] actually exists??? I assume that if we have mono, the
// ports array is only one item long...?
if ( ports[1] )
{
if ( jack_connect ( pJackClient, ports[1], jack_port_name ( input_port_right ) ) )
{
throw CGenErr ( tr ( "Cannot connect the Jack input ports" ) );
}
}
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jack_free ( ports );
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}
// try to connect physical output ports
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if ( ( ports = jack_get_ports ( pJackClient,
NULL,
NULL,
JackPortIsPhysical | JackPortIsInput ) ) != NULL )
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{
if ( jack_connect ( pJackClient, jack_port_name ( output_port_left ), ports[0] ) )
{
throw CGenErr ( tr ( "Cannot connect the Jack output ports." ) );
}
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// before connecting the second stereo channel, check if the output is not
// mono
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// TODO who checks if ports[1] actually exists??? I assume that if we have mono, the
// ports array is only one item long...?
if ( ports[1] )
{
if ( jack_connect ( pJackClient, jack_port_name ( output_port_right ), ports[1] ) )
{
throw CGenErr ( tr ( "Cannot connect the Jack output ports." ) );
}
}
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jack_free ( ports );
}
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}
void CSound::CloseJack()
{
// deactivate client
jack_deactivate ( pJackClient );
// 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 );
// 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();
}
int CSound::Init ( const int /* iNewPrefMonoBufferSize */ )
{
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// try setting buffer size
// TODO seems not to work! -> no audio after this operation!
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// Doesn't this give an infinite loop? The set buffer size function will call our
// registerd callback which calls "EmitReinitRequestSignal()". In that function
// this CSound::Init() function is called...
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//jack_set_buffer_size ( pJackClient, iNewPrefMonoBufferSize );
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// get actual buffer size
iJACKBufferSizeMono = jack_get_buffer_size ( pJackClient );
// init base class
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;
}
// JACK callbacks --------------------------------------------------------------
int CSound::process ( jack_nframes_t nframes, void* arg )
{
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CSound* pSound = static_cast<CSound*> ( arg );
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int i;
if ( pSound->IsRunning() )
{
// 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
if ( in_left != 0 && in_right != 0 )
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{
for ( i = 0; i < pSound->iJACKBufferSizeMono; i++ )
{
pSound->vecsTmpAudioSndCrdStereo[2 * i] =
(short) ( in_left[i] * _MAXSHORT );
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pSound->vecsTmpAudioSndCrdStereo[2 * i + 1] =
(short) ( in_right[i] * _MAXSHORT );
}
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}
// 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
if ( out_left != 0 && out_right != 0 )
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{
for ( i = 0; i < pSound->iJACKBufferSizeMono; i++ )
{
out_left[i] = (jack_default_audio_sample_t)
pSound->vecsTmpAudioSndCrdStereo[2 * i] / _MAXSHORT;
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out_right[i] = (jack_default_audio_sample_t)
pSound->vecsTmpAudioSndCrdStereo[2 * i + 1] / _MAXSHORT;
}
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}
}
else
{
// 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
if ( out_left != 0 && out_right != 0 )
{
memset ( out_left,
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0,
sizeof ( jack_default_audio_sample_t ) * nframes );
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memset ( out_right,
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0,
sizeof ( jack_default_audio_sample_t ) * nframes );
}
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}
return 0; // zero on success, non-zero on error
}
int CSound::bufferSizeCallback ( jack_nframes_t, void *arg )
{
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CSound* pSound = static_cast<CSound*> ( arg );
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pSound->EmitReinitRequestSignal ( RS_ONLY_RESTART_AND_INIT );
return 0; // zero on success, non-zero on error
}
void CSound::shutdownCallback ( void* )
{
// without a Jack server, our software makes no sense to run, throw
// error message
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throw CGenErr ( tr ( "The Jack server was shut down. This software "
"requires a Jack server to run. Try to restart the software to "
"solve the issue." ) );
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}
#endif // WITH_SOUND