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/*
* Copyright (C) 2003-2009 The Music Player Daemon Project
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "../output_api.h"
#include <ao/ao.h>
#include <glib.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "ao"
/* An ao_sample_format, with all fields set to zero: */
static const ao_sample_format OUR_AO_FORMAT_INITIALIZER;
static unsigned ao_output_ref;
struct ao_data {
size_t write_size;
int driver;
ao_option *options;
ao_device *device;
} AoData;
static inline GQuark
ao_output_quark(void)
{
return g_quark_from_static_string("ao_output");
}
static void
ao_output_error(GError **error_r)
{
const char *error;
switch (errno) {
case AO_ENODRIVER:
error = "No such libao driver";
break;
case AO_ENOTLIVE:
error = "This driver is not a libao live device";
break;
case AO_EBADOPTION:
error = "Invalid libao option";
break;
case AO_EOPENDEVICE:
error = "Cannot open the libao device";
break;
case AO_EFAIL:
error = "Generic libao failure";
break;
default:
error = strerror(errno);
}
g_set_error(error_r, ao_output_quark(), errno,
"%s", error);
}
static void *
ao_output_init(G_GNUC_UNUSED const struct audio_format *audio_format,
const struct config_param *param,
GError **error)
{
struct ao_data *ad = g_new(struct ao_data, 1);
ao_info *ai;
const char *value;
ad->options = NULL;
ad->write_size = config_get_block_unsigned(param, "write_size", 1024);
if (ao_output_ref == 0) {
ao_initialize();
}
ao_output_ref++;
value = config_get_block_string(param, "driver", "default");
if (0 == strcmp(value, "default"))
ad->driver = ao_default_driver_id();
else
ad->driver = ao_driver_id(value);
if (ad->driver < 0) {
g_set_error(error, ao_output_quark(), 0,
"\"%s\" is not a valid ao driver",
value);
return NULL;
}
if ((ai = ao_driver_info(ad->driver)) == NULL) {
g_set_error(error, ao_output_quark(), 0,
"problems getting driver info");
return NULL;
}
g_debug("using ao driver \"%s\" for \"%s\"\n", ai->short_name,
config_get_block_string(param, "name", NULL));
value = config_get_block_string(param, "options", NULL);
if (value != NULL) {
gchar **options = g_strsplit(value, ";", 0);
for (unsigned i = 0; options[i] != NULL; ++i) {
gchar **key_value = g_strsplit(options[i], "=", 2);
if (key_value[0] == NULL || key_value[1] == NULL) {
g_set_error(error, ao_output_quark(), 0,
"problems parsing options \"%s\"",
options[i]);
return NULL;
}
ao_append_option(&ad->options, key_value[0],
key_value[1]);
g_strfreev(key_value);
}
g_strfreev(options);
}
return ad;
}
static void
ao_output_finish(void *data)
{
struct ao_data *ad = (struct ao_data *)data;
ao_free_options(ad->options);
g_free(ad);
ao_output_ref--;
if (ao_output_ref == 0)
ao_shutdown();
}
static void
ao_output_close(void *data)
{
struct ao_data *ad = (struct ao_data *)data;
ao_close(ad->device);
}
static bool
ao_output_open(void *data, struct audio_format *audio_format,
GError **error)
{
ao_sample_format format = OUR_AO_FORMAT_INITIALIZER;
struct ao_data *ad = (struct ao_data *)data;
/* support for 24 bit samples in libao is currently dubious,
and until we have sorted that out, resample everything to
16 bit */
if (audio_format->bits > 16)
audio_format->bits = 16;
format.bits = audio_format->bits;
format.rate = audio_format->sample_rate;
format.byte_format = AO_FMT_NATIVE;
format.channels = audio_format->channels;
ad->device = ao_open_live(ad->driver, &format, ad->options);
if (ad->device == NULL) {
ao_output_error(error);
return false;
}
return true;
}
/**
* For whatever reason, libao wants a non-const pointer. Let's hope
* it does not write to the buffer, and use the union deconst hack to
* work around this API misdesign.
*/
static int ao_play_deconst(ao_device *device, const void *output_samples,
uint_32 num_bytes)
{
union {
const void *in;
void *out;
} u;
u.in = output_samples;
return ao_play(device, u.out, num_bytes);
}
static size_t
ao_output_play(void *data, const void *chunk, size_t size,
GError **error)
{
struct ao_data *ad = (struct ao_data *)data;
if (size > ad->write_size)
size = ad->write_size;
if (ao_play_deconst(ad->device, chunk, size) == 0) {
ao_output_error(error);
return 0;
}
return size;
}
const struct audio_output_plugin ao_output_plugin = {
.name = "ao",
.init = ao_output_init,
.finish = ao_output_finish,
.open = ao_output_open,
.close = ao_output_close,
.play = ao_output_play,
};
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