a2dp.c

这是Linux环境下的蓝牙源代码

/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2006-2007  Nokia Corporation
 *  Copyright (C) 2004-2008  Marcel Holtmann <[e-mail]>
 *
 *
 *  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 St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

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

#include <stdlib.h>
#include <errno.h>

#include <dbus/dbus.h>
#include <glib.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/sdp.h>
#include <bluetooth/sdp_lib.h>

#include "logging.h"
#include "device.h"
#include "manager.h"
#include "avdtp.h"
#include "sink.h"
#include "a2dp.h"
#include "sdpd.h"

/* The duration that streams without users are allowed to stay in
 * STREAMING state. */
#define SUSPEND_TIMEOUT 5000
#define RECONFIGURE_TIMEOUT 500

#ifndef MIN
# define MIN(x, y) ((x) < (y) ? (x) : (y))
#endif

#ifndef MAX
# define MAX(x, y) ((x) > (y) ? (x) : (y))
#endif

struct a2dp_sep {
	uint8_t type;
	uint8_t codec;
	struct avdtp_local_sep *sep;
	struct avdtp *session;
	struct avdtp_stream *stream;
	guint suspend_timer;
	gboolean locked;
	gboolean suspending;
	gboolean starting;
};

struct a2dp_setup_cb {
	a2dp_config_cb_t config_cb;
	a2dp_stream_cb_t resume_cb;
	a2dp_stream_cb_t suspend_cb;
	void *user_data;
	int id;
};

struct a2dp_setup {
	struct avdtp *session;
	struct a2dp_sep *sep;
	struct avdtp_stream *stream;
	struct avdtp_error *err;
	GSList *client_caps;
	gboolean reconfigure;
	gboolean canceled;
	gboolean start;
	GSList *cb;
	int ref;
};

static DBusConnection *connection = NULL;

static GSList *sinks = NULL;
static GSList *sources = NULL;

static uint32_t source_record_id = 0;
static uint32_t sink_record_id = 0;

static GSList *setups = NULL;
static unsigned int cb_id = 0;

static struct a2dp_setup *setup_ref(struct a2dp_setup *setup)
{
	setup->ref++;

	debug("setup_ref(%p): ref=%d", setup, setup->ref);

	return setup;
}

static void setup_free(struct a2dp_setup *s)
{
	debug("setup_free(%p)", s);
	setups = g_slist_remove(setups, s);
	if (s->session)
		avdtp_unref(s->session);
	g_slist_foreach(s->cb, (GFunc) g_free, NULL);
	g_slist_free(s->cb);
	g_free(s);
}

static void setup_unref(struct a2dp_setup *setup)
{
	setup->ref--;

	debug("setup_unref(%p): ref=%d", setup, setup->ref);

	if (setup->ref <= 0)
		setup_free(setup);
}

static struct audio_device *a2dp_get_dev(struct avdtp *session)
{
	bdaddr_t addr;

	avdtp_get_peers(session, NULL, &addr);

	return manager_find_device(&addr, NULL, FALSE);
}

static gboolean finalize_config(struct a2dp_setup *s)
{
	GSList *l;

	setup_ref(s);
	for (l = s->cb; l != NULL; l = l->next) {
		struct a2dp_setup_cb *cb = l->data;

		if (cb->config_cb) {
			cb->config_cb(s->session, s->sep, s->stream, s->err,
					cb->user_data);
			cb->config_cb = NULL;
			setup_unref(s);
		}
	}

	setup_unref(s);
	return FALSE;
}

static gboolean finalize_config_errno(struct a2dp_setup *s, int err)
{
	struct avdtp_error avdtp_err;

	avdtp_error_init(&avdtp_err, AVDTP_ERROR_ERRNO, -err);
	s->err = err ? &avdtp_err : NULL;

	return finalize_config(s);
}

static gboolean finalize_resume(struct a2dp_setup *s)
{
	GSList *l;

	setup_ref(s);
	for (l = s->cb; l != NULL; l = l->next) {
		struct a2dp_setup_cb *cb = l->data;

		if (cb->resume_cb) {
			cb->resume_cb(s->session, s->err, cb->user_data);
			cb->resume_cb = NULL;
			setup_unref(s);
		}
	}

	setup_unref(s);
	return FALSE;
}

static gboolean finalize_resume_errno(struct a2dp_setup *s, int err)
{
	struct avdtp_error avdtp_err;

	avdtp_error_init(&avdtp_err, AVDTP_ERROR_ERRNO, -err);
	s->err = err ? &avdtp_err : NULL;

	return finalize_resume(s);
}

static gboolean finalize_suspend(struct a2dp_setup *s)
{
	GSList *l;

	setup_ref(s);
	for (l = s->cb; l != NULL; l = l->next) {
		struct a2dp_setup_cb *cb = l->data;

		if (cb->suspend_cb) {
			cb->suspend_cb(s->session, s->err, cb->user_data);
			cb->suspend_cb = NULL;
			setup_unref(s);
		}
	}

	setup_unref(s);
	return FALSE;
}

static gboolean finalize_suspend_errno(struct a2dp_setup *s, int err)
{
	struct avdtp_error avdtp_err;

	avdtp_error_init(&avdtp_err, AVDTP_ERROR_ERRNO, -err);
	s->err = err ? &avdtp_err : NULL;

	return finalize_suspend(s);
}

static struct a2dp_setup *find_setup_by_session(struct avdtp *session)
{
	GSList *l;

	for (l = setups; l != NULL; l = l->next) {
		struct a2dp_setup *setup = l->data;

		if (setup->session == session)
			return setup;
	}

	return NULL;
}

static struct a2dp_setup *find_setup_by_dev(struct audio_device *dev)
{
	GSList *l;

	for (l = setups; l != NULL; l = l->next) {
		struct a2dp_setup *setup = l->data;
		struct audio_device *setup_dev = a2dp_get_dev(setup->session);

		if (setup_dev == dev)
			return setup;
	}

	return NULL;
}

static void stream_state_changed(struct avdtp_stream *stream,
					avdtp_state_t old_state,
					avdtp_state_t new_state,
					struct avdtp_error *err,
					void *user_data)
{
	struct a2dp_sep *sep = user_data;

	if (new_state != AVDTP_STATE_IDLE)
		return;

	if (sep->suspend_timer) {
		g_source_remove(sep->suspend_timer);
		sep->suspend_timer = 0;
	}

	if (sep->session) {
		avdtp_unref(sep->session);
		sep->session = NULL;
	}

	sep->stream = NULL;

}

static gboolean sbc_setconf_ind(struct avdtp *session,
				struct avdtp_local_sep *sep,
				struct avdtp_stream *stream,
				GSList *caps, uint8_t *err,
				uint8_t *category, void *user_data)
{
	struct a2dp_sep *a2dp_sep = user_data;
	struct audio_device *dev;
	struct avdtp_service_capability *cap;
	struct avdtp_media_codec_capability *codec_cap;
	struct sbc_codec_cap *sbc_cap;

	if (a2dp_sep->type == AVDTP_SEP_TYPE_SINK)
		debug("Sink %p: Set_Configuration_Ind", sep);
	else
		debug("Source %p: Set_Configuration_Ind", sep);

	dev = a2dp_get_dev(session);
	if (!dev) {
		*err = AVDTP_UNSUPPORTED_CONFIGURATION;
		*category = 0x00;
		return FALSE;
	}

	/* Check bipool range */
	for (codec_cap = NULL; caps; caps = g_slist_next(caps)) {
		cap = caps->data;
		if (cap->category == AVDTP_MEDIA_CODEC) {
			codec_cap = (void *) cap->data;
			if (codec_cap->media_codec_type == A2DP_CODEC_SBC) {
				sbc_cap = (void *) codec_cap;
				if (sbc_cap->min_bitpool < MIN_BITPOOL ||
					sbc_cap->max_bitpool > MAX_BITPOOL) {
					*err = AVDTP_UNSUPPORTED_CONFIGURATION;
					*category = AVDTP_MEDIA_CODEC;
					return FALSE;
				}
			}
			break;
		}
	}

	avdtp_stream_add_cb(session, stream, stream_state_changed, a2dp_sep);
	a2dp_sep->stream = stream;

	if (a2dp_sep->type == AVDTP_SEP_TYPE_SOURCE)
		sink_new_stream(dev, session, stream);

	return TRUE;
}

static gboolean sbc_getcap_ind(struct avdtp *session, struct avdtp_local_sep *sep,
				GSList **caps, uint8_t *err, void *user_data)
{
	struct a2dp_sep *a2dp_sep = user_data;
	struct avdtp_service_capability *media_transport, *media_codec;
	struct sbc_codec_cap sbc_cap;

	if (a2dp_sep->type == AVDTP_SEP_TYPE_SINK)
		debug("Sink %p: Get_Capability_Ind", sep);
	else
		debug("Source %p: Get_Capability_Ind", sep);

	*caps = NULL;

	media_transport = avdtp_service_cap_new(AVDTP_MEDIA_TRANSPORT,
						NULL, 0);

	*caps = g_slist_append(*caps, media_transport);

	memset(&sbc_cap, 0, sizeof(struct sbc_codec_cap));

	sbc_cap.cap.media_type = AVDTP_MEDIA_TYPE_AUDIO;
	sbc_cap.cap.media_codec_type = A2DP_CODEC_SBC;

	sbc_cap.frequency = ( SBC_SAMPLING_FREQ_48000 |
				SBC_SAMPLING_FREQ_44100 |
				SBC_SAMPLING_FREQ_32000 |
				SBC_SAMPLING_FREQ_16000 );

	sbc_cap.channel_mode = ( SBC_CHANNEL_MODE_JOINT_STEREO |
					SBC_CHANNEL_MODE_STEREO |
					SBC_CHANNEL_MODE_DUAL_CHANNEL |
					SBC_CHANNEL_MODE_MONO );

	sbc_cap.block_length = ( SBC_BLOCK_LENGTH_16 |
					SBC_BLOCK_LENGTH_12 |
					SBC_BLOCK_LENGTH_8 |
					SBC_BLOCK_LENGTH_4 );

	sbc_cap.subbands = ( SBC_SUBBANDS_8 | SBC_SUBBANDS_4 );

	sbc_cap.allocation_method = ( SBC_ALLOCATION_LOUDNESS |
					SBC_ALLOCATION_SNR );

	sbc_cap.min_bitpool = MIN_BITPOOL;
	sbc_cap.max_bitpool = MAX_BITPOOL;

	media_codec = avdtp_service_cap_new(AVDTP_MEDIA_CODEC, &sbc_cap,
						sizeof(sbc_cap));

	*caps = g_slist_append(*caps, media_codec);

	return TRUE;
}

static gboolean mpeg_setconf_ind(struct avdtp *session,
				struct avdtp_local_sep *sep,
				struct avdtp_stream *stream,
				GSList *caps, uint8_t *err,
				uint8_t *category, void *user_data)
{
	struct a2dp_sep *a2dp_sep = user_data;
	struct audio_device *dev;

	if (a2dp_sep->type == AVDTP_SEP_TYPE_SINK)
		debug("Sink %p: Set_Configuration_Ind", sep);
	else
		debug("Source %p: Set_Configuration_Ind", sep);

	dev = a2dp_get_dev(session);
	if (!dev) {
		*err = AVDTP_UNSUPPORTED_CONFIGURATION;
		*category = 0x00;
		return FALSE;
	}

	avdtp_stream_add_cb(session, stream, stream_state_changed, a2dp_sep);
	a2dp_sep->stream = stream;

	if (a2dp_sep->type == AVDTP_SEP_TYPE_SOURCE)
		sink_new_stream(dev, session, stream);

	return TRUE;
}

static gboolean mpeg_getcap_ind(struct avdtp *session,
				struct avdtp_local_sep *sep,
				GSList **caps, uint8_t *err, void *user_data)
{
	struct a2dp_sep *a2dp_sep = user_data;
	struct avdtp_service_capability *media_transport, *media_codec;
	struct mpeg_codec_cap mpeg_cap;

	if (a2dp_sep->type == AVDTP_SEP_TYPE_SINK)
		debug("Sink %p: Get_Capability_Ind", sep);
	else
		debug("Source %p: Get_Capability_Ind", sep);

	*caps = NULL;

	media_transport = avdtp_service_cap_new(AVDTP_MEDIA_TRANSPORT,
						NULL, 0);

	*caps = g_slist_append(*caps, media_transport);

	memset(&mpeg_cap, 0, sizeof(struct mpeg_codec_cap));

	mpeg_cap.cap.media_type = AVDTP_MEDIA_TYPE_AUDIO;
	mpeg_cap.cap.media_codec_type = A2DP_CODEC_MPEG12;

	mpeg_cap.frequency = ( MPEG_SAMPLING_FREQ_48000 |
				MPEG_SAMPLING_FREQ_44100 |
				MPEG_SAMPLING_FREQ_32000 |
				MPEG_SAMPLING_FREQ_24000 |
				MPEG_SAMPLING_FREQ_22050 |
				MPEG_SAMPLING_FREQ_16000 );

	mpeg_cap.channel_mode = ( MPEG_CHANNEL_MODE_JOINT_STEREO |
					MPEG_CHANNEL_MODE_STEREO |
					MPEG_CHANNEL_MODE_DUAL_CHANNEL |
					MPEG_CHANNEL_MODE_MONO );

	mpeg_cap.layer = ( MPEG_LAYER_MP3 | MPEG_LAYER_MP2 | MPEG_LAYER_MP1 );

	mpeg_cap.bitrate = 0xFFFF;

	media_codec = avdtp_service_cap_new(AVDTP_MEDIA_CODEC, &mpeg_cap,
						sizeof(mpeg_cap));

	*caps = g_slist_append(*caps, media_codec);

	return TRUE;
}

static void setconf_cfm(struct avdtp *session, struct avdtp_local_sep *sep,
				struct avdtp_stream *stream,
				struct avdtp_error *err, void *user_data)
{
	struct a2dp_sep *a2dp_sep = user_data;
	struct a2dp_setup *setup;
	struct audio_device *dev;
	int ret;

	if (a2dp_sep->type == AVDTP_SEP_TYPE_SINK)
		debug("Sink %p: Set_Configuration_Cfm", sep);
	else
		debug("Source %p: Set_Configuration_Cfm", sep);

	setup = find_setup_by_session(session);

	if (err) {
		if (setup) {
			setup->err = err;
			finalize_config(setup);
		}
		return;