obs-studio/plugins/linux-jack/jack-input.c

/*
Copyright (C) 2015 by Bernd Buschinski <[email protected]>

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, see <http://www.gnu.org/licenses/>.
*/

#include "jack-wrapper.h"

#include <obs-module.h>
#include <util/dstr.h>

/**
 * Returns the name of the plugin
 */
static const char *jack_input_getname(void *unused)
{
	UNUSED_PARAMETER(unused);
	return obs_module_text("JACKInput");
}

/**
 * Destroy the plugin object and free all memory
 */
static void jack_destroy(void *vptr)
{
	struct jack_data *data = (struct jack_data *)vptr;

	if (!data)
		return;

	deactivate_jack(data);

	if (data->device)
		bfree(data->device);
	pthread_mutex_destroy(&data->jack_mutex);
	bfree(data);
}

/**
 * Update the input settings
 */
static void jack_update(void *vptr, obs_data_t *settings)
{
	struct jack_data *data = (struct jack_data *)vptr;
	if (!data)
		return;

	const char *new_device;
	bool settings_changed = false;
	bool new_jack_start_server = obs_data_get_bool(settings, "startjack");
	int new_channel_count = obs_data_get_int(settings, "channels");

	if (new_jack_start_server != data->start_jack_server) {
		data->start_jack_server = new_jack_start_server;
		settings_changed = true;
	}

	if (new_channel_count != data->channels)
		/*
		 * keep "old" channel count  for now,
		 * we need to destroy the correct number of channels
		 */
		settings_changed = true;

	new_device = obs_source_get_name(data->source);
	if (!data->device || strcmp(data->device, new_device) != 0) {
		if (data->device)
			bfree(data->device);
		/* prefix all devices to make it clear that they belong to obs */
		struct dstr device;
		dstr_init(&device);
		dstr_catf(&device, "OBS Studio: %s", new_device);
		data->device = bstrdup(device.array);
		settings_changed = true;
		dstr_free(&device);
	}

	if (settings_changed) {
		deactivate_jack(data);

		data->channels = new_channel_count;

		if (jack_init(data) != 0) {
			deactivate_jack(data);
		}
	}
}

/**
 * Create the plugin object
 */
static void *jack_create(obs_data_t *settings, obs_source_t *source)
{
	struct jack_data *data = bzalloc(sizeof(struct jack_data));

	pthread_mutex_init(&data->jack_mutex, NULL);
	data->source = source;
	data->channels = -1;

	jack_update(data, settings);

	if (data->jack_client == NULL) {
		jack_destroy(data);
		return NULL;
	}
	return data;
}

/**
 * Get plugin defaults
 */
static void jack_input_defaults(obs_data_t *settings)
{
	obs_data_set_default_int(settings, "channels", 2);
	obs_data_set_default_bool(settings, "startjack", false);
}

/**
 * Get plugin properties
 */
static obs_properties_t *jack_input_properties(void *unused)
{
	(void)unused;

	obs_properties_t *props = obs_properties_create();

	obs_properties_add_int(props, "channels", obs_module_text("Channels"),
			       1, 8, 1);
	obs_properties_add_bool(props, "startjack",
				obs_module_text("StartJACKServer"));

	return props;
}

struct obs_source_info jack_output_capture = {
	.id = "jack_output_capture",
	.type = OBS_SOURCE_TYPE_INPUT,
	.output_flags = OBS_SOURCE_AUDIO,
	.get_name = jack_input_getname,
	.create = jack_create,
	.destroy = jack_destroy,
	.update = jack_update,
	.get_defaults = jack_input_defaults,
	.get_properties = jack_input_properties,
	.icon_type = OBS_ICON_TYPE_AUDIO_OUTPUT,
};