1 files changed, 252 insertions, 0 deletions
diff --git a/src/output/ao_output_plugin.c b/src/output/ao_output_plugin.c
new file mode 100644
index 000000000..33366d3b8
--- /dev/null
+++ b/src/output/ao_output_plugin.c
@@ -0,0 +1,252 @@
+/*
+ * Copyright (C) 2003-2011 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"
+
+/* 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);
+		g_free(ad);
+		return NULL;
+	}
+
+	if ((ai = ao_driver_info(ad->driver)) == NULL) {
+		g_set_error(error, ao_output_quark(), 0,
+			    "problems getting driver info");
+		g_free(ad);
+		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]);
+				g_free(ad);
+				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;
+
+	switch (audio_format->format) {
+	case SAMPLE_FORMAT_S8:
+		format.bits = 8;
+		break;
+
+	case SAMPLE_FORMAT_S16:
+		format.bits = 16;
+		break;
+
+	default:
+		/* support for 24 bit samples in libao is currently
+		   dubious, and until we have sorted that out,
+		   convert everything to 16 bit */
+		audio_format->format = SAMPLE_FORMAT_S16;
+		format.bits = 16;
+		break;
+	}
+
+	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,
+};