mpd/src/output/shout_plugin.c

/* the Music Player Daemon (MPD)
 * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
 * This project's homepage is: http://www.musicpd.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.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "shout_plugin.h"
#include "config.h"

#include <assert.h>
#include <stdlib.h>
#include <stdio.h>

#define CONN_ATTEMPT_INTERVAL 60
#define DEFAULT_CONN_TIMEOUT  2

static int shout_init_count;

static const struct shout_encoder_plugin *const shout_encoder_plugins[] = {
#ifdef HAVE_SHOUT_MP3
	&shout_mp3_encoder,
#endif
#ifdef HAVE_SHOUT_OGG
	&shout_ogg_encoder,
#endif
	NULL
};

static const struct shout_encoder_plugin *
shout_encoder_plugin_get(const char *name)
{
	unsigned i;

	for (i = 0; shout_encoder_plugins[i] != NULL; ++i)
		if (strcmp(shout_encoder_plugins[i]->name, name) == 0)
			return shout_encoder_plugins[i];

	return NULL;
}

static struct shout_data *new_shout_data(void)
{
	struct shout_data *ret = g_new(struct shout_data, 1);

	ret->shout_conn = shout_new();
	ret->shout_meta = shout_metadata_new();
	ret->opened = 0;
	ret->tag = NULL;
	ret->tag_to_send = 0;
	ret->bitrate = -1;
	ret->quality = -2.0;
	ret->timeout = DEFAULT_CONN_TIMEOUT;
	ret->conn_attempts = 0;
	ret->last_attempt = 0;
	ret->timer = NULL;
	ret->buf.len = 0;

	return ret;
}

static void free_shout_data(struct shout_data *sd)
{
	if (sd->shout_meta)
		shout_metadata_free(sd->shout_meta);
	if (sd->shout_conn)
		shout_free(sd->shout_conn);
	if (sd->tag)
		tag_free(sd->tag);
	if (sd->timer)
		timer_free(sd->timer);

	free(sd);
}

#define check_block_param(name) {		  \
		block_param = getBlockParam(param, name);	\
		if (!block_param) {					\
			g_error("no \"%s\" defined for shout device defined at line " \
				"%i\n", name, param->line);		\
		}							\
	}

static void *my_shout_init_driver(struct audio_output *audio_output,
				  const struct audio_format *audio_format,
				  ConfigParam *param)
{
	struct shout_data *sd;
	char *test;
	int port;
	char *host;
	char *mount;
	char *passwd;
	const char *encoding;
	unsigned protocol;
	const char *user;
	char *name;
	BlockParam *block_param;
	int public;

	sd = new_shout_data();
	sd->audio_output = audio_output;

	if (shout_init_count == 0)
		shout_init();

	shout_init_count++;

	check_block_param("host");
	host = block_param->value;

	check_block_param("mount");
	mount = block_param->value;

	check_block_param("port");

	port = strtol(block_param->value, &test, 10);

	if (*test != '\0' || port <= 0) {
		g_error("shout port \"%s\" is not a positive integer, line %i\n",
			block_param->value, block_param->line);
	}

	check_block_param("password");
	passwd = block_param->value;

	check_block_param("name");
	name = block_param->value;

	public = getBoolBlockParam(param, "public", 1);
	if (public == CONF_BOOL_UNSET)
		public = 0;

	block_param = getBlockParam(param, "user");
	if (block_param)
		user = block_param->value;
	else
		user = "source";

	block_param = getBlockParam(param, "quality");

	if (block_param) {
		int line = block_param->line;

		sd->quality = strtod(block_param->value, &test);

		if (*test != '\0' || sd->quality < -1.0 || sd->quality > 10.0) {
			g_error("shout quality \"%s\" is not a number in the "
				"range -1 to 10, line %i\n", block_param->value,
				block_param->line);
		}

		block_param = getBlockParam(param, "bitrate");

		if (block_param) {
			g_error("quality (line %i) and bitrate (line %i) are "
				"both defined for shout output\n", line,
				block_param->line);
		}
	} else {
		block_param = getBlockParam(param, "bitrate");

		if (!block_param) {
			g_error("neither bitrate nor quality defined for shout "
				"output at line %i\n", param->line);
		}

		sd->bitrate = strtol(block_param->value, &test, 10);

		if (*test != '\0' || sd->bitrate <= 0) {
			g_error("bitrate at line %i should be a positive integer "
				"\n", block_param->line);
		}
	}

	check_block_param("format");

	assert(audio_format != NULL);
	sd->audio_format = *audio_format;

	block_param = getBlockParam(param, "encoding");
	if (block_param) {
		if (0 == strcmp(block_param->value, "mp3"))
			encoding = block_param->value;
		else if (0 == strcmp(block_param->value, "ogg"))
			encoding = block_param->value;
		else
			g_error("shout encoding \"%s\" is not \"ogg\" or "
				"\"mp3\", line %i\n", block_param->value,
				block_param->line);
	} else {
		encoding = "ogg";
	}

	sd->encoder = shout_encoder_plugin_get(encoding);
	if (sd->encoder == NULL)
		g_error("couldn't find shout encoder plugin \"%s\"\n",
			encoding);

	block_param = getBlockParam(param, "protocol");
	if (block_param) {
		if (0 == strcmp(block_param->value, "shoutcast") &&
		    0 != strcmp(encoding, "mp3"))
			g_error("you cannot stream \"%s\" to shoutcast, use mp3\n",
				encoding);
		else if (0 == strcmp(block_param->value, "shoutcast"))
			protocol = SHOUT_PROTOCOL_ICY;
		else if (0 == strcmp(block_param->value, "icecast1"))
			protocol = SHOUT_PROTOCOL_XAUDIOCAST;
		else if (0 == strcmp(block_param->value, "icecast2"))
			protocol = SHOUT_PROTOCOL_HTTP;
		else
			g_error("shout protocol \"%s\" is not \"shoutcast\" or "
				"\"icecast1\"or "
				"\"icecast2\", line %i\n", block_param->value,
				block_param->line);
	} else {
		protocol = SHOUT_PROTOCOL_HTTP;
	}

	if (shout_set_host(sd->shout_conn, host) != SHOUTERR_SUCCESS ||
	    shout_set_port(sd->shout_conn, port) != SHOUTERR_SUCCESS ||
	    shout_set_password(sd->shout_conn, passwd) != SHOUTERR_SUCCESS ||
	    shout_set_mount(sd->shout_conn, mount) != SHOUTERR_SUCCESS ||
	    shout_set_name(sd->shout_conn, name) != SHOUTERR_SUCCESS ||
	    shout_set_user(sd->shout_conn, user) != SHOUTERR_SUCCESS ||
	    shout_set_public(sd->shout_conn, public) != SHOUTERR_SUCCESS ||
	    shout_set_nonblocking(sd->shout_conn, 1) != SHOUTERR_SUCCESS ||
	    shout_set_format(sd->shout_conn, sd->encoder->shout_format)
	    != SHOUTERR_SUCCESS ||
	    shout_set_protocol(sd->shout_conn, protocol) != SHOUTERR_SUCCESS ||
	    shout_set_agent(sd->shout_conn, "MPD") != SHOUTERR_SUCCESS) {
		g_error("error configuring shout defined at line %i: %s\n",
			param->line, shout_get_error(sd->shout_conn));
	}

	/* optional paramters */
	block_param = getBlockParam(param, "timeout");
	if (block_param) {
		sd->timeout = (int)strtol(block_param->value, &test, 10);
		if (*test != '\0' || sd->timeout <= 0) {
			g_error("shout timeout is not a positive integer, "
				"line %i\n", block_param->line);
		}
	}

	block_param = getBlockParam(param, "genre");
	if (block_param && shout_set_genre(sd->shout_conn, block_param->value)) {
		g_error("error configuring shout defined at line %i: %s\n",
			param->line, shout_get_error(sd->shout_conn));
	}

	block_param = getBlockParam(param, "description");
	if (block_param && shout_set_description(sd->shout_conn,
						 block_param->value)) {
		g_error("error configuring shout defined at line %i: %s\n",
			param->line, shout_get_error(sd->shout_conn));
	}

	{
		char temp[11];
		memset(temp, 0, sizeof(temp));

		snprintf(temp, sizeof(temp), "%u", sd->audio_format.channels);
		shout_set_audio_info(sd->shout_conn, SHOUT_AI_CHANNELS, temp);

		snprintf(temp, sizeof(temp), "%u", sd->audio_format.sample_rate);

		shout_set_audio_info(sd->shout_conn, SHOUT_AI_SAMPLERATE, temp);

		if (sd->quality >= -1.0) {
			snprintf(temp, sizeof(temp), "%2.2f", sd->quality);
			shout_set_audio_info(sd->shout_conn, SHOUT_AI_QUALITY,
					     temp);
		} else {
			snprintf(temp, sizeof(temp), "%d", sd->bitrate);
			shout_set_audio_info(sd->shout_conn, SHOUT_AI_BITRATE,
					     temp);
		}
	}

	if (sd->encoder->init_func(sd) != 0)
		g_error("shout: encoder plugin '%s' failed to initialize\n",
			sd->encoder->name);

	return sd;
}

static int handle_shout_error(struct shout_data *sd, int err)
{
	switch (err) {
	case SHOUTERR_SUCCESS:
		break;
	case SHOUTERR_UNCONNECTED:
	case SHOUTERR_SOCKET:
		g_warning("Lost shout connection to %s:%i: %s\n",
			  shout_get_host(sd->shout_conn),
			  shout_get_port(sd->shout_conn),
			  shout_get_error(sd->shout_conn));
		sd->shout_error = 1;
		return -1;
	default:
		g_warning("shout: connection to %s:%i error: %s\n",
			  shout_get_host(sd->shout_conn),
			  shout_get_port(sd->shout_conn),
			  shout_get_error(sd->shout_conn));
		sd->shout_error = 1;
		return -1;
	}

	return 0;
}

static int write_page(struct shout_data *sd)
{
	int err;

	if (sd->buf.len == 0)
		return 0;

	shout_sync(sd->shout_conn);
	err = shout_send(sd->shout_conn, sd->buf.data, sd->buf.len);
	if (handle_shout_error(sd, err) < 0)
		return -1;
	sd->buf.len = 0;

	return 0;
}

static void close_shout_conn(struct shout_data * sd)
{
	if (sd->opened) {
		if (sd->encoder->clear_encoder_func(sd))
			write_page(sd);
	}

	if (shout_get_connected(sd->shout_conn) != SHOUTERR_UNCONNECTED &&
	    shout_close(sd->shout_conn) != SHOUTERR_SUCCESS) {
		g_warning("problem closing connection to shout server: %s\n",
			  shout_get_error(sd->shout_conn));
	}

	sd->opened = false;
}

static void my_shout_finish_driver(void *data)
{
	struct shout_data *sd = (struct shout_data *)data;

	close_shout_conn(sd);

	sd->encoder->finish_func(sd);
	free_shout_data(sd);

	shout_init_count--;

	if (shout_init_count == 0)
		shout_shutdown();
}

static void my_shout_drop_buffered_audio(void *data)
{
	struct shout_data *sd = (struct shout_data *)data;
	timer_reset(sd->timer);

	/* needs to be implemented for shout */
}

static void my_shout_close_device(void *data)
{
	struct shout_data *sd = (struct shout_data *)data;

	close_shout_conn(sd);

	if (sd->timer) {
		timer_free(sd->timer);
		sd->timer = NULL;
	}
}

static int shout_connect(struct shout_data *sd)
{
	time_t t = time(NULL);
	int state = shout_get_connected(sd->shout_conn);

	/* already connected */
	if (state == SHOUTERR_CONNECTED)
		return 0;

	/* waiting to connect */
	if (state == SHOUTERR_BUSY && sd->conn_attempts != 0) {
		/* timeout waiting to connect */
		if ((t - sd->last_attempt) > sd->timeout) {
			g_warning("timeout connecting to shout server %s:%i "
				  "(attempt %i)\n",
				  shout_get_host(sd->shout_conn),
				  shout_get_port(sd->shout_conn),
				  sd->conn_attempts);
			return -1;
		}

		return 1;
	}

	/* we're in some funky state, so just reset it to unconnected */
	if (state != SHOUTERR_UNCONNECTED)
		shout_close(sd->shout_conn);

	/* throttle new connection attempts */
	if (sd->conn_attempts != 0 &&
	    (t - sd->last_attempt) <= CONN_ATTEMPT_INTERVAL) {
		return -1;
	}

	/* initiate a new connection */

	sd->conn_attempts++;
	sd->last_attempt = t;

	state = shout_open(sd->shout_conn);
	switch (state) {
	case SHOUTERR_SUCCESS:
	case SHOUTERR_CONNECTED:
		return 0;
	case SHOUTERR_BUSY:
		return 1;
	default:
		g_warning("problem opening connection to shout server %s:%i "
			  "(attempt %i): %s\n",
			  shout_get_host(sd->shout_conn),
			  shout_get_port(sd->shout_conn),
			  sd->conn_attempts, shout_get_error(sd->shout_conn));
		return -1;
	}
}

static int open_shout_conn(void *data)
{
	struct shout_data *sd = (struct shout_data *)data;
	int status;

	status = shout_connect(sd);
	if (status != 0)
		return status;

	if (sd->encoder->init_encoder_func(sd) < 0) {
		shout_close(sd->shout_conn);
		return -1;
	}

	write_page(sd);

	sd->shout_error = 0;
	sd->opened = true;
	sd->tag_to_send = 1;
	sd->conn_attempts = 0;

	return 0;
}

static bool my_shout_open_device(void *data,
				struct audio_format *audio_format)
{
	struct shout_data *sd = (struct shout_data *)data;

	if (!sd->opened && open_shout_conn(sd) < 0)
		return false;

	if (sd->timer)
		timer_free(sd->timer);

	sd->timer = timer_new(audio_format);

	return true;
}

static void send_metadata(struct shout_data * sd)
{
	static const int size = 1024;
	char song[size];

	if (!sd->opened || !sd->tag)
		return;

	if (sd->encoder->send_metadata_func(sd, song, size)) {
		shout_metadata_add(sd->shout_meta, "song", song);
		if (SHOUTERR_SUCCESS != shout_set_metadata(sd->shout_conn,
							   sd->shout_meta)) {
			g_warning("error setting shout metadata\n");
			return;
		}
	}

	sd->tag_to_send = 0;
}

static bool
my_shout_play(void *data, const char *chunk, size_t size)
{
	struct shout_data *sd = (struct shout_data *)data;
	int status;

	if (!sd->timer->started)
		timer_start(sd->timer);

	timer_add(sd->timer, size);

	if (sd->opened && sd->tag_to_send)
		send_metadata(sd);

	if (!sd->opened) {
		status = open_shout_conn(sd);
		if (status < 0) {
			return false;
		} else if (status > 0) {
			timer_sync(sd->timer);
			return true;
		}
	}

	if (sd->encoder->encode_func(sd, chunk, size))
		return false;

	if (write_page(sd) < 0)
		return false;

	return true;
}

static void my_shout_pause(void *data)
{
	struct shout_data *sd = (struct shout_data *)data;
	static const char silence[1020];
	int ret;

	/* play silence until the player thread sends us a command */

	while (sd->opened && !audio_output_is_pending(sd->audio_output)) {
		ret = my_shout_play(data, silence, sizeof(silence));
		if (ret != 0)
			break;
	}
}

static void my_shout_set_tag(void *data,
			     const struct tag *tag)
{
	struct shout_data *sd = (struct shout_data *)data;

	if (sd->tag)
		tag_free(sd->tag);
	sd->tag = NULL;
	sd->tag_to_send = 0;

	if (!tag)
		return;

	sd->tag = tag_dup(tag);
	sd->tag_to_send = 1;
}

const struct audio_output_plugin shoutPlugin = {
	.name = "shout",
	.init = my_shout_init_driver,
	.finish = my_shout_finish_driver,
	.open = my_shout_open_device,
	.play = my_shout_play,
	.pause = my_shout_pause,
	.cancel = my_shout_drop_buffered_audio,
	.close = my_shout_close_device,
	.send_tag = my_shout_set_tag,
};