gsta2dpsink.c

实现bluez蓝牙profile需要的库

/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2004-2007  Marcel Holtmann <[e-mail]>
 *
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <unistd.h>
#include <sys/un.h>
#include <sys/socket.h>

#include "ipc.h"

#include "gsta2dpsink.h"

GST_DEBUG_CATEGORY_STATIC(a2dp_sink_debug);
#define GST_CAT_DEFAULT a2dp_sink_debug

#define DEFAULT_DEVICE "default"

enum {
	PROP_0,
	PROP_DEVICE,
};

GST_BOILERPLATE(GstA2dpSink, gst_a2dp_sink, GstAudioSink, GST_TYPE_AUDIO_SINK);

static const GstElementDetails a2dp_sink_details =
	GST_ELEMENT_DETAILS("Bluetooth A2DP sink",
				"Sink/Audio",
				"Plays audio to an A2DP device",
				"Marcel Holtmann <[e-mail]>");

static GstStaticPadTemplate a2dp_sink_factory =
	GST_STATIC_PAD_TEMPLATE("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
		GST_STATIC_CAPS("audio/x-sbc, "
				"rate = (int) { 16000, 32000, 44100, 48000 }, "
				"channels = (int) [ 1, 2 ], "
				"mode = (string) { mono, dual, stereo, joint }, "
				"blocks = (int) { 4, 8, 12, 16 }, "
				"subbands = (int) { 4, 8 }, "
				"allocation = (string) { snr, loudness }; "

				"audio/mpeg, "
				"mpegversion = (int) 1, "
				"layer = (int) [ 1, 3 ], "
				"rate = (int) { 16000, 22050, 24000, 32000, 44100, 48000 }, "
				"channels = (int) [ 1, 2 ]"));

static void gst_a2dp_sink_base_init(gpointer g_class)
{
	GstElementClass *element_class = GST_ELEMENT_CLASS(g_class);

	gst_element_class_add_pad_template(element_class,
		gst_static_pad_template_get(&a2dp_sink_factory));

	gst_element_class_set_details(element_class, &a2dp_sink_details);
}

static void gst_a2dp_sink_finalize(GObject *object)
{
	GstA2dpSink *sink = GST_A2DP_SINK(object);

	g_io_channel_close(sink->server);

	g_free(sink->device);

	G_OBJECT_CLASS(parent_class)->finalize(object);
}

static void gst_a2dp_sink_set_property(GObject *object, guint prop_id,
					const GValue *value, GParamSpec *pspec)
{
	GstA2dpSink *sink = GST_A2DP_SINK(object);

	switch (prop_id) {
	case PROP_DEVICE:
		g_free(sink->device);
		sink->device = g_value_dup_string(value);

		if (sink->device == NULL)
			sink->device = g_strdup(DEFAULT_DEVICE);
		break;

	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
		break;
	}
}

static void gst_a2dp_sink_get_property(GObject *object, guint prop_id,
					GValue *value, GParamSpec *pspec)
{
	GstA2dpSink *sink = GST_A2DP_SINK(object);

	switch (prop_id) {
	case PROP_DEVICE:
		g_value_set_string(value, sink->device);
		break;

	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
		break;
	}
}

static gboolean gst_a2dp_sink_open(GstAudioSink *self)
{
	GstA2dpSink *sink = GST_A2DP_SINK(self);

	printf("device %s\n", sink->device);
	printf("open\n");

	return TRUE;
}

static gboolean gst_a2dp_sink_prepare(GstAudioSink *self,
						GstRingBufferSpec *spec)
{
	printf("perpare\n");
	printf("rate %d\n", spec->rate);
	printf("channels %d\n", spec->channels);

	return TRUE;
}

static gboolean gst_a2dp_sink_unprepare(GstAudioSink *self)
{
	printf("unprepare\n");

	return TRUE;
}

static gboolean gst_a2dp_sink_close(GstAudioSink *self)
{
	printf("close\n");

	return TRUE;
}

static guint gst_a2dp_sink_write(GstAudioSink *self,
					gpointer data, guint length)
{
	return 0;
}

static guint gst_a2dp_sink_delay(GstAudioSink *audiosink)
{
	printf("delay\n");

	return 0;
}

static void gst_a2dp_sink_reset(GstAudioSink *audiosink)
{
	printf("reset\n");
}

static gboolean server_callback(GIOChannel *chan,
					GIOCondition cond, gpointer data)
{
	printf("callback\n");

	return TRUE;
}

static void gst_a2dp_sink_class_init(GstA2dpSinkClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS(klass);
	GstAudioSinkClass *audiosink_class = GST_AUDIO_SINK_CLASS(klass);

	parent_class = g_type_class_peek_parent(klass);

	object_class->finalize = GST_DEBUG_FUNCPTR(gst_a2dp_sink_finalize);
	object_class->set_property = GST_DEBUG_FUNCPTR(gst_a2dp_sink_set_property);
	object_class->get_property = GST_DEBUG_FUNCPTR(gst_a2dp_sink_get_property);

	audiosink_class->open = GST_DEBUG_FUNCPTR(gst_a2dp_sink_open);
	audiosink_class->prepare = GST_DEBUG_FUNCPTR(gst_a2dp_sink_prepare);
	audiosink_class->unprepare = GST_DEBUG_FUNCPTR(gst_a2dp_sink_unprepare);
	audiosink_class->close = GST_DEBUG_FUNCPTR(gst_a2dp_sink_close);
	audiosink_class->write = GST_DEBUG_FUNCPTR(gst_a2dp_sink_write);
	audiosink_class->delay = GST_DEBUG_FUNCPTR(gst_a2dp_sink_delay);
	audiosink_class->reset = GST_DEBUG_FUNCPTR(gst_a2dp_sink_reset);

	g_object_class_install_property(object_class, PROP_DEVICE,
				g_param_spec_string("device", "Device",
					"Bluetooth remote device",
					DEFAULT_DEVICE, G_PARAM_READWRITE));

	GST_DEBUG_CATEGORY_INIT(a2dp_sink_debug, "a2dpsink", 0,
						"A2DP sink element");
}

static void gst_a2dp_sink_init(GstA2dpSink *self, GstA2dpSinkClass *klass)
{
	struct sockaddr_un addr = { AF_UNIX, IPC_SOCKET_NAME };
	int sk;

	self->device = g_strdup(DEFAULT_DEVICE);

	sk = socket(PF_LOCAL, SOCK_STREAM, 0);
	if (sk < 0)
		return;

	if (connect(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
		close(sk);
		return;
	}

	self->server = g_io_channel_unix_new(sk);

	g_io_add_watch(self->server, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
							server_callback, self);

	g_io_channel_unref(self->server);
}