/* 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 "../output_api.h" #include <ao/ao.h> #include <glib.h> #undef G_LOG_DOMAIN #define G_LOG_DOMAIN "ao" static int driverInitCount; typedef struct _AoData { int writeSize; int driverId; ao_option *options; ao_device *device; } AoData; static AoData *newAoData(void) { AoData *ret = g_malloc(sizeof(AoData)); ret->device = NULL; ret->options = NULL; return ret; } static void audioOutputAo_error(const char *msg) { 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_warning("%s: %s\n", msg, error); } static void *audioOutputAo_initDriver(struct audio_output *ao, G_GNUC_UNUSED const struct audio_format *audio_format, ConfigParam * param) { ao_info *ai; char *test; AoData *ad = newAoData(); BlockParam *blockParam; if ((blockParam = getBlockParam(param, "write_size"))) { ad->writeSize = strtol(blockParam->value, &test, 10); if (*test != '\0') { g_error("\"%s\" is not a valid write size at line %i\n", blockParam->value, blockParam->line); } } else ad->writeSize = 1024; if (driverInitCount == 0) { ao_initialize(); } driverInitCount++; blockParam = getBlockParam(param, "driver"); if (!blockParam || 0 == strcmp(blockParam->value, "default")) { ad->driverId = ao_default_driver_id(); } else if ((ad->driverId = ao_driver_id(blockParam->value)) < 0) { g_error("\"%s\" is not a valid ao driver at line %i\n", blockParam->value, blockParam->line); } if ((ai = ao_driver_info(ad->driverId)) == NULL) { g_error("problems getting driver info for device defined at line %i\n" "you may not have permission to the audio device\n", param->line); } g_debug("using ao driver \"%s\" for \"%s\"\n", ai->short_name, audio_output_get_name(ao)); blockParam = getBlockParam(param, "options"); if (blockParam) { gchar **options = g_strsplit(blockParam->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_error("problems parsing options \"%s\"\n", options[i]); ao_append_option(&ad->options, key_value[0], key_value[1]); g_strfreev(key_value); } g_strfreev(options); } return ad; } static void freeAoData(AoData * ad) { ao_free_options(ad->options); free(ad); } static void audioOutputAo_finishDriver(void *data) { AoData *ad = (AoData *)data; freeAoData(ad); driverInitCount--; if (driverInitCount == 0) ao_shutdown(); } static void audioOutputAo_dropBufferedAudio(G_GNUC_UNUSED void *data) { /* not supported by libao */ } static void audioOutputAo_closeDevice(void *data) { AoData *ad = (AoData *)data; if (ad->device) { ao_close(ad->device); ad->device = NULL; } } static bool audioOutputAo_openDevice(void *data, struct audio_format *audio_format) { ao_sample_format format; AoData *ad = (AoData *)data; if (ad->device) { audioOutputAo_closeDevice(ad); } /* 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->driverId, &format, ad->options); if (ad->device == NULL) { audioOutputAo_error("Failed to open libao"); 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 bool audioOutputAo_play(void *data, const char *playChunk, size_t size) { AoData *ad = (AoData *)data; size_t chunk_size; if (ad->device == NULL) return false; while (size > 0) { chunk_size = (size_t)ad->writeSize > size ? size : (size_t)ad->writeSize; if (ao_play_deconst(ad->device, playChunk, chunk_size) == 0) { audioOutputAo_error("Closing libao device due to play error"); return false; } playChunk += chunk_size; size -= chunk_size; } return true; } const struct audio_output_plugin aoPlugin = { .name = "ao", .init = audioOutputAo_initDriver, .finish = audioOutputAo_finishDriver, .open = audioOutputAo_openDevice, .play = audioOutputAo_play, .cancel = audioOutputAo_dropBufferedAudio, .close = audioOutputAo_closeDevice, };