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-rw-r--r--plugins/audiooutput/alsa/k3balsaoutputplugin.cpp293
1 files changed, 293 insertions, 0 deletions
diff --git a/plugins/audiooutput/alsa/k3balsaoutputplugin.cpp b/plugins/audiooutput/alsa/k3balsaoutputplugin.cpp
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+++ b/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 <qlayout.h>
+#include <qlabel.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;
+ QString lastErrorMessage;
+
+ bool swap;
+
+ unsigned int sampleRate;
+};
+
+
+K3bAlsaOutputPlugin::K3bAlsaOutputPlugin( QObject* 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").arg(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").arg(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" );
+ QString 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).").arg(alsaDevice).arg(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)").arg(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).").arg(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).").arg(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).").arg(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).").arg(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).").arg(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).").arg(snd_strerror(err));
+ snd_pcm_hw_params_free( hw_params );
+ d->error = true;
+ return false;
+ }
+
+ snd_pcm_hw_params_free(hw_params);
+
+ return true;
+}
+
+
+QString K3bAlsaOutputPlugin::lastErrorMessage() const
+{
+ return d->lastErrorMessage;
+}
+
+
+K3bPluginConfigWidget* K3bAlsaOutputPlugin::createConfigWidget( QWidget* parent,
+ const char* name ) const
+{
+ return new K3bAlsaOutputPluginConfigWidget( parent, name );
+}
+
+
+
+K3bAlsaOutputPluginConfigWidget::K3bAlsaOutputPluginConfigWidget( QWidget* parent, const char* name )
+ : K3bPluginConfigWidget( parent, name )
+{
+ QHBoxLayout* l = new QHBoxLayout( this );
+ l->setSpacing( KDialog::spacingHint() );
+ l->setAutoAdd( true );
+
+ (void)new QLabel( 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"
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