audio_dialog.cpp

jpeg and mpeg 编解码技术源代码

void CreateBitRateMenu()
{
	u_int8_t i;
	u_int16_t oldBitRate = bitRateValues[bitRateIndex];
	u_int32_t samplingRate = samplingRateValues[samplingRateIndex];

	// free up old names
	for (i = 0; i < bitRateNumber; i++) {
		free(bitRateNames[i]);
		bitRateNames[i] = NULL;
	}
	bitRateNumber = 0;
	
	// make current bitrate index invalid, will fixup below
	bitRateIndex = 255;

	// for all possible bitrates
	for (i = 0; i < bitRateAllNumber; i++) {

		// MP3 can't use all the possible bit rates
		// LAME imposes additional constraints
		if (encodingIndex == 0) {
			if (samplingRate >= 32000) {
				// MPEG-1

				if (bitRateAllValues[i] < 40
				  || bitRateAllValues[i] == 144) {
					continue;
				}
				if (samplingRate >= 44100 && bitRateAllValues[i] < 56) {
					continue;
				}
				if (samplingRate >= 48000 && bitRateAllValues[i] < 64) {
					continue;
				}

			} else {
				// MPEG-2 or MPEG-2.5

				if (samplingRate > 16000) {
					if (bitRateAllValues[i] < 32) {
						continue;
					}
				}

				if (bitRateAllValues[i] > 160) {
					continue;
				}
			}
		}

		char buf[64];
		snprintf(buf, sizeof(buf), "%u",
			bitRateAllValues[i]);
		bitRateNames[bitRateNumber] = stralloc(buf);

		bitRateValues[bitRateNumber] = bitRateAllValues[i];

		// preserve user's current choice if we can
		if (oldBitRate == bitRateValues[bitRateNumber]) {
			bitRateIndex = bitRateNumber;
		}

		bitRateNumber++;
	}

	if (bitRateIndex >= bitRateNumber) {
		bitRateIndex = bitRateNumber - 1; 
	}

	// (re)create the menu
	bit_rate_menu = CreateOptionMenu(
		bit_rate_menu,
		bitRateNames, 
		bitRateNumber,
		bitRateIndex,
		GTK_SIGNAL_FUNC(on_bit_rate_menu_activate));
}

static bool ValidateAndSave(void)
{
	// if source has been modified
	if (source_modified) {
		// validate it
		ChangeSource();

		// can't validate
		if (source_modified) {
			return false;
		}
	}

	// copy new values to config

	MyConfig->SetStringValue(CONFIG_AUDIO_SOURCE_TYPE,
		source_type);

	MyConfig->SetStringValue(CONFIG_AUDIO_SOURCE_NAME,
		gtk_entry_get_text(GTK_ENTRY(source_entry)));

	MyConfig->UpdateFileHistory(
		gtk_entry_get_text(GTK_ENTRY(source_entry)));

	if (MyConfig->m_audioCapabilities != pAudioCaps) {
		delete MyConfig->m_audioCapabilities;
		MyConfig->m_audioCapabilities = pAudioCaps;
	}

	MyConfig->SetStringValue(CONFIG_AUDIO_INPUT_NAME,
		inputValues[inputIndex]);

	MyConfig->SetIntegerValue(CONFIG_AUDIO_SOURCE_TRACK,
		trackValues ? trackValues[trackIndex] : 0);

	MyConfig->SetIntegerValue(CONFIG_AUDIO_CHANNELS, 
		channelValues[channelIndex]);

	if (encodingIndex == 1) {
		MyConfig->SetStringValue(CONFIG_AUDIO_ENCODING, AUDIO_ENCODING_AAC);
		MyConfig->SetStringValue(CONFIG_AUDIO_ENCODER, AUDIO_ENCODER_FAAC);
	} else {
		MyConfig->SetStringValue(CONFIG_AUDIO_ENCODING, AUDIO_ENCODING_MP3);
		MyConfig->SetStringValue(CONFIG_AUDIO_ENCODER, AUDIO_ENCODER_LAME);
	}

	MyConfig->SetIntegerValue(CONFIG_AUDIO_SAMPLE_RATE, 
		samplingRateValues[samplingRateIndex]);

	MyConfig->SetIntegerValue(CONFIG_AUDIO_BIT_RATE,
		bitRateValues[bitRateIndex]);

	MyConfig->Update();

	DisplayAudioSettings();  // display settings in main window
	DisplayStatusSettings();  

	return true;
}

static void on_ok_button (GtkWidget *widget, gpointer *data)
{
	// check and save values
	if (!ValidateAndSave()) {
		return;
	}
    on_destroy_dialog(NULL, NULL);
}

static void on_cancel_button (GtkWidget *widget, gpointer *data)
{
	on_destroy_dialog(NULL, NULL);
}

void CreateAudioDialog (void) 
{
	GtkWidget* hbox;
	GtkWidget* vbox;
	GtkWidget* hbox2;
	GtkWidget* label;
	GtkWidget* button;

	pAudioCaps = MyConfig->m_audioCapabilities;

	dialog = gtk_dialog_new();
	gtk_signal_connect(GTK_OBJECT(dialog),
		"destroy",
		GTK_SIGNAL_FUNC(on_destroy_dialog),
		&dialog);

	gtk_window_set_title(GTK_WINDOW(dialog), "Audio Settings");

	hbox = gtk_hbox_new(FALSE, 1);
	gtk_widget_show(hbox);
	gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), hbox,
		FALSE, FALSE, 5);

	vbox = gtk_vbox_new(TRUE, 1);
	gtk_widget_show(vbox);
	gtk_box_pack_start(GTK_BOX(hbox), vbox, TRUE, TRUE, 5);

	label = gtk_label_new(" Source:");
	gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);
	gtk_widget_show(label);
	gtk_box_pack_start(GTK_BOX(vbox), label, FALSE, FALSE, 0);

	input_label = gtk_label_new("   Input Port:");
	gtk_misc_set_alignment(GTK_MISC(input_label), 0.0, 0.5);
	gtk_box_pack_start(GTK_BOX(vbox), input_label, FALSE, FALSE, 0);

	track_label = gtk_label_new("   Track:");
	gtk_misc_set_alignment(GTK_MISC(track_label), 0.0, 0.5);
	gtk_box_pack_start(GTK_BOX(vbox), track_label, FALSE, FALSE, 0);

	label = gtk_label_new(" Output:");
	gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);
	gtk_widget_show(label);
	gtk_box_pack_start(GTK_BOX(vbox), label, FALSE, FALSE, 0);

	label = gtk_label_new("   Encoding :");
	gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);
	gtk_widget_show(label);
	gtk_box_pack_start(GTK_BOX(vbox), label, FALSE, FALSE, 0);

	label = gtk_label_new("   Channels:");
	gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);
	gtk_widget_show(label);
	gtk_box_pack_start(GTK_BOX(vbox), label, FALSE, FALSE, 0);

	label = gtk_label_new("   Sampling Rate (Hz):");
	gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);
	gtk_widget_show(label);
	gtk_box_pack_start(GTK_BOX(vbox), label, FALSE, FALSE, 0);

	label = gtk_label_new("   Bit Rate (kbps):");
	gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);
	gtk_widget_show(label);
	gtk_box_pack_start(GTK_BOX(vbox), label, FALSE, FALSE, 0);


	vbox = gtk_vbox_new(TRUE, 1);
	gtk_widget_show(vbox);
	gtk_box_pack_start(GTK_BOX(hbox), vbox, TRUE, TRUE, 5);

	hbox2 = gtk_hbox_new(FALSE, 1);
	gtk_widget_show(hbox2);
	gtk_box_pack_start(GTK_BOX(vbox), hbox2, FALSE, FALSE, 0);

	source_type = MyConfig->GetStringValue(CONFIG_AUDIO_SOURCE_TYPE);

	// source entry
	free(source_name);
	source_name =
		stralloc(MyConfig->GetStringValue(CONFIG_AUDIO_SOURCE_NAME));

	source_modified = false;

	source_combo = CreateFileCombo(source_name);

	source_entry = GTK_COMBO(source_combo)->entry;

	SetEntryValidator(GTK_OBJECT(source_entry),
		GTK_SIGNAL_FUNC(on_source_entry_changed),
		GTK_SIGNAL_FUNC(on_source_leave));

	source_list = GTK_COMBO(source_combo)->list;
	gtk_signal_connect(GTK_OBJECT(source_list), "select_child",
		GTK_SIGNAL_FUNC(on_source_list_changed), NULL);

	gtk_widget_show(source_combo);
	gtk_box_pack_start(GTK_BOX(hbox2), source_combo, TRUE, TRUE, 0);

	// browse button
	browse_button = gtk_button_new_with_label(" Browse... ");
	gtk_signal_connect(GTK_OBJECT(browse_button),
		 "clicked",
		 GTK_SIGNAL_FUNC(on_source_browse_button),
		 NULL);
	gtk_widget_show(browse_button);
	gtk_box_pack_start(GTK_BOX(hbox2), browse_button, FALSE, FALSE, 5);

	// input menu
	inputIndex = 0;
	for (u_int8_t i = 0; i < sizeof(inputValues) / sizeof(u_int8_t); i++) {
		if (!strcasecmp(MyConfig->GetStringValue(CONFIG_AUDIO_INPUT_NAME),
		  inputValues[i])) {
			inputIndex = i;
			break;
		}
	}
	input_menu = CreateOptionMenu (NULL,
		inputNames, 
		sizeof(inputNames) / sizeof(char*),
		inputIndex,
		GTK_SIGNAL_FUNC(on_input_menu_activate));
	gtk_box_pack_start(GTK_BOX(vbox), input_menu, TRUE, TRUE, 0);

	// track menu
	track_menu = NULL;
	track_menu = CreateTrackMenu(
		track_menu,
		'A',
		gtk_entry_get_text(GTK_ENTRY(source_entry)),
		&trackIndex,
		&trackNumber,
		&trackValues);

	trackIndex = 0; 
	for (u_int8_t i = 0; i < trackNumber; i++) {
		if (MyConfig->GetIntegerValue(CONFIG_AUDIO_SOURCE_TRACK)
		   == trackValues[i]) {
			trackIndex = i;
			break;
		}
	}
	gtk_box_pack_start(GTK_BOX(vbox), track_menu, FALSE, FALSE, 0);

	// spacer
	label = gtk_label_new(" ");
	gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);
	gtk_widget_show(label);
	gtk_box_pack_start(GTK_BOX(vbox), label, FALSE, FALSE, 0);

	if (!strcasecmp(MyConfig->GetStringValue(CONFIG_AUDIO_ENCODING),
	  AUDIO_ENCODING_AAC)) {
		encodingIndex = 1;
	} else {
		encodingIndex = 0;
	}
	encoding_menu = CreateOptionMenu (NULL,
		encodingNames, 
		sizeof(encodingNames) / sizeof(char*),
		encodingIndex,
		GTK_SIGNAL_FUNC(on_encoding_menu_activate));
	gtk_box_pack_start(GTK_BOX(vbox), encoding_menu, TRUE, TRUE, 0);

	// channel menu
	channelIndex = 0;
	for (u_int8_t i = 0; i < sizeof(channelValues) / sizeof(u_int8_t); i++) {
		if (MyConfig->GetIntegerValue(CONFIG_AUDIO_CHANNELS)
		  == channelValues[i]) {
			channelIndex = i;
			break;
		}
	}
	channel_menu = CreateOptionMenu (NULL,
		channelNames, 
		sizeof(channelNames) / sizeof(char*),
		channelIndex,
		GTK_SIGNAL_FUNC(on_channel_menu_activate));
	gtk_box_pack_start(GTK_BOX(vbox), channel_menu, TRUE, TRUE, 0);

	sampling_rate_menu = NULL;
	CreateSamplingRateMenu(pAudioCaps);
	gtk_box_pack_start(GTK_BOX(vbox), sampling_rate_menu, TRUE, TRUE, 0);

	// set sampling rate value based on MyConfig
	SetSamplingRate(MyConfig->GetIntegerValue(CONFIG_AUDIO_SAMPLE_RATE));

	bit_rate_menu = NULL;
	CreateBitRateMenu();
	gtk_box_pack_start(GTK_BOX(vbox), bit_rate_menu, TRUE, TRUE, 0);

	// set bit rate value based on MyConfig
	for (u_int8_t i = 0; i < bitRateNumber; i++) {
		if (MyConfig->GetIntegerValue(CONFIG_AUDIO_BIT_RATE)
		  == bitRateValues[i]) {
			bitRateIndex = i;
			break;
		}
	}
	gtk_option_menu_set_history(
		GTK_OPTION_MENU(bit_rate_menu), bitRateIndex);

	// Add standard buttons at bottom
	button = AddButtonToDialog(dialog,
		" OK ", 
		GTK_SIGNAL_FUNC(on_ok_button));
	GTK_WIDGET_SET_FLAGS(button, GTK_CAN_DEFAULT);

	AddButtonToDialog(dialog,
		" Cancel ", 
		GTK_SIGNAL_FUNC(on_cancel_button));

	ShowSourceSpecificSettings();

	gtk_widget_show(dialog);
}

/* end audio_dialog.cpp */