/* * 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 "config.h" #include "output_api.h" #include <ao/ao.h> #include <glib.h> #undef G_LOG_DOMAIN #define G_LOG_DOMAIN "ao" 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; 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, };