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