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k3b/plugins/audiooutput/alsa/k3balsaoutputplugin.cpp

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/*
*
* $Id: k3bartsoutputplugin.cpp 369057 2004-12-07 14:05:11Z trueg $
* Copyright (C) 2004 Sebastian Trueg <trueg@k3b.org>
*
* This file is part of the K3b project.
* Copyright (C) 1998-2007 Sebastian Trueg <trueg@k3b.org>
*
* 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.
* See the file "COPYING" for the exact licensing terms.
*/
#include <config.h>
#include "k3balsaoutputplugin.h"
#include <k3bpluginfactory.h>
#include <k3bcore.h>
#include <kdebug.h>
#include <kcombobox.h>
#include <klocale.h>
#include <kconfig.h>
#include <kdialog.h>
#include <tqlayout.h>
#include <tqlabel.h>
#include <alsa/asoundlib.h>
#include <alsa/pcm.h>
K_EXPORT_COMPONENT_FACTORY( libk3balsaoutputplugin, K3bPluginFactory<K3bAlsaOutputPlugin>( "k3balsaoutputplugin" ) )
class K3bAlsaOutputPlugin::Private
{
public:
Private()
: pcm_playback(0),
error(false) {
}
snd_pcm_t *pcm_playback;
bool error;
TQString lastErrorMessage;
bool swap;
unsigned int sampleRate;
};
K3bAlsaOutputPlugin::K3bAlsaOutputPlugin( TQObject* parent, const char* name )
: K3bAudioOutputPlugin( parent, name )
{
d = new Private;
}
K3bAlsaOutputPlugin::~K3bAlsaOutputPlugin()
{
cleanup();
delete d;
}
int K3bAlsaOutputPlugin::write( char* data, int len )
{
if( d->error )
return -1;
char* buffer = data;
if( d->swap ) {
buffer = new char[len];
for( int i = 0; i < len-1; i+=2 ) {
buffer[i] = data[i+1];
buffer[i+1] = data[i];
}
}
int written = 0;
while( written < len ) {
snd_pcm_sframes_t frames = snd_pcm_writei( d->pcm_playback,
buffer+written,
snd_pcm_bytes_to_frames( d->pcm_playback, len-written ) );
if( frames < 0 ) {
if( !recoverFromError( frames ) ) {
d->error = true;
return -1;
}
}
else {
written += snd_pcm_frames_to_bytes( d->pcm_playback, frames );
}
}
return written;
}
bool K3bAlsaOutputPlugin::recoverFromError( int err )
{
if( err == -EPIPE ) {
err = snd_pcm_prepare( d->pcm_playback );
if( err < 0 ) {
d->lastErrorMessage = i18n("Internal Alsa problem: %1").tqarg(snd_strerror(err));
return false;
}
}
else if( err == -ESTRPIPE ) {
while( ( err = snd_pcm_resume( d->pcm_playback ) ) == -EAGAIN )
sleep( 1 );
if (err < 0) {
// unable to wake up pcm device, restart it
err = snd_pcm_prepare( d->pcm_playback );
if( err < 0 ) {
d->lastErrorMessage = i18n("Internal Alsa problem: %1").tqarg(snd_strerror(err));
return false;
}
}
return true;
}
return false;
}
void K3bAlsaOutputPlugin::cleanup()
{
if( d->pcm_playback ) {
snd_pcm_drain( d->pcm_playback );
snd_pcm_close( d->pcm_playback );
}
d->pcm_playback = 0;
d->error = false;
}
bool K3bAlsaOutputPlugin::init()
{
cleanup();
KConfigGroup c( k3bcore->config(), "Alsa Output Plugin" );
TQString alsaDevice = c.readEntry( "output device", "default" );
int err = snd_pcm_open( &d->pcm_playback, alsaDevice.local8Bit(), SND_PCM_STREAM_PLAYBACK, 0 );
if( err < 0 ) {
d->lastErrorMessage = i18n("Could not open alsa audio device '%1' (%2).").tqarg(alsaDevice).tqarg(snd_strerror(err));
d->error = true;
return false;
}
if( !setupHwParams() ) {
d->error = true;
return false;
}
d->error = false;
return true;
}
bool K3bAlsaOutputPlugin::setupHwParams()
{
snd_pcm_hw_params_t* hw_params;
int err = 0;
if( ( err = snd_pcm_hw_params_malloc( &hw_params ) ) < 0 ) {
d->lastErrorMessage = i18n("Could not allocate hardware parameter structure (%1)").tqarg(snd_strerror(err));
d->error = true;
return false;
}
if( (err = snd_pcm_hw_params_any( d->pcm_playback, hw_params )) < 0) {
d->lastErrorMessage = i18n("Could not initialize hardware parameter structure (%1).").tqarg(snd_strerror(err));
snd_pcm_hw_params_free( hw_params );
d->error = true;
return false;
}
if( (err = snd_pcm_hw_params_set_access( d->pcm_playback, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
d->lastErrorMessage = i18n("Could not set access type (%1).").tqarg(snd_strerror(err));
snd_pcm_hw_params_free( hw_params );
d->error = true;
return false;
}
if( (err = snd_pcm_hw_params_set_format( d->pcm_playback, hw_params, SND_PCM_FORMAT_S16_BE)) < 0) {
if( (err = snd_pcm_hw_params_set_format( d->pcm_playback, hw_params, SND_PCM_FORMAT_S16_LE)) < 0) {
d->lastErrorMessage = i18n("Could not set sample format (%1).").tqarg(snd_strerror(err));
snd_pcm_hw_params_free( hw_params );
d->error = true;
return false;
}
else
d->swap = true;
}
else
d->swap = false;
d->sampleRate = 44100;
if( (err = snd_pcm_hw_params_set_rate_near( d->pcm_playback, hw_params, &d->sampleRate, 0)) < 0) {
d->lastErrorMessage = i18n("Could not set sample rate (%1).").tqarg(snd_strerror(err));
snd_pcm_hw_params_free( hw_params );
d->error = true;
return false;
}
kdDebug() << "(K3bAlsaOutputPlugin) samplerate set to " << d->sampleRate << endl;
if( (err = snd_pcm_hw_params_set_channels( d->pcm_playback, hw_params, 2)) < 0) {
d->lastErrorMessage = i18n("Could not set channel count (%1).").tqarg(snd_strerror(err));
snd_pcm_hw_params_free( hw_params );
d->error = true;
return false;
}
if( (err = snd_pcm_hw_params( d->pcm_playback, hw_params )) < 0) {
d->lastErrorMessage = i18n("Could not set parameters (%1).").tqarg(snd_strerror(err));
snd_pcm_hw_params_free( hw_params );
d->error = true;
return false;
}
snd_pcm_hw_params_free(hw_params);
return true;
}
TQString K3bAlsaOutputPlugin::lastErrorMessage() const
{
return d->lastErrorMessage;
}
K3bPluginConfigWidget* K3bAlsaOutputPlugin::createConfigWidget( TQWidget* parent,
const char* name ) const
{
return new K3bAlsaOutputPluginConfigWidget( parent, name );
}
K3bAlsaOutputPluginConfigWidget::K3bAlsaOutputPluginConfigWidget( TQWidget* parent, const char* name )
: K3bPluginConfigWidget( parent, name )
{
TQHBoxLayout* l = new TQHBoxLayout( this );
l->setSpacing( KDialog::spacingHint() );
l->setAutoAdd( true );
(void)new TQLabel( i18n("Alsa device:"), this );
m_comboDevice = new KComboBox( this );
m_comboDevice->setEditable( true );
// enable completion
m_comboDevice->completionObject();
// FIXME: initialize the list of devices
m_comboDevice->insertItem( "default" );
}
K3bAlsaOutputPluginConfigWidget::~K3bAlsaOutputPluginConfigWidget()
{
}
void K3bAlsaOutputPluginConfigWidget::loadConfig()
{
KConfigGroup c( k3bcore->config(), "Alsa Output Plugin" );
m_comboDevice->setCurrentText( c.readEntry( "output device", "default" ) );
}
void K3bAlsaOutputPluginConfigWidget::saveConfig()
{
KConfigGroup c( k3bcore->config(), "Alsa Output Plugin" );
c.writeEntry( "output device", m_comboDevice->currentText() );
}
#include "k3balsaoutputplugin.moc"