unix.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 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 <stdio.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <stdint.h>

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

#include "logging.h"
#include "dbus.h"
#include "ipc.h"
#include "device.h"
#include "manager.h"
#include "avdtp.h"
#include "a2dp.h"
#include "headset.h"
#include "sink.h"
#include "unix.h"

typedef enum {
	TYPE_NONE,
	TYPE_HEADSET,
	TYPE_SINK,
	TYPE_SOURCE
} service_type_t;

typedef void (*notify_cb_t) (struct device *dev, void *data);

struct a2dp_data {
	struct avdtp *session;
	struct avdtp_stream *stream;
	struct a2dp_sep *sep;
};

struct headset_data {
	headset_lock_t lock;
};

struct unix_client {
	struct device *dev;
	struct avdtp_service_capability *media_codec;
	service_type_t type;
	char *interface;
	union {
		struct a2dp_data a2dp;
		struct headset_data hs;
	} d;
	int sock;
	int fd_opt;
	unsigned int req_id;
	unsigned int cb_id;
	gboolean (*cancel_stream) (struct device *dev, unsigned int id);
};

static GSList *clients = NULL;

static int unix_sock = -1;

static void client_free(struct unix_client *client)
{
	struct a2dp_data *a2dp;

	switch (client->type) {
	case TYPE_SINK:
	case TYPE_SOURCE:
		a2dp = &client->d.a2dp;
		if (client->cb_id > 0)
			avdtp_stream_remove_cb(a2dp->session, a2dp->stream,
								client->cb_id);
		if (a2dp->sep)
			a2dp_sep_unlock(a2dp->sep, a2dp->session);
		if (a2dp->session)
			avdtp_unref(a2dp->session);
		break;
	default:
		break;
	}

	if (client->sock >= 0)
		close(client->sock);

	if (client->media_codec)
		g_free(client->media_codec);

	g_free(client->interface);
	g_free(client);
}

/* Pass file descriptor through local domain sockets (AF_LOCAL, formerly AF_UNIX)
and the sendmsg() system call with the cmsg_type field of a "struct cmsghdr" set
to SCM_RIGHTS and the data being an integer value equal to the handle of the 
file descriptor to be passed.*/
static int unix_sendmsg_fd(int sock, int fd)
{
	char cmsg_b[CMSG_SPACE(sizeof(int))], m = 'm';
	struct cmsghdr *cmsg;
	struct iovec iov = { &m, sizeof(m) };
	struct msghdr msgh;

	memset(&msgh, 0, sizeof(msgh));
	msgh.msg_iov = &iov;
	msgh.msg_iovlen = 1;
	msgh.msg_control = &cmsg_b;
	msgh.msg_controllen = CMSG_LEN(sizeof(int));

	cmsg = CMSG_FIRSTHDR(&msgh);
	cmsg->cmsg_level = SOL_SOCKET;
	cmsg->cmsg_type = SCM_RIGHTS;
	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
	/* Initialize the payload */
	(*(int *) CMSG_DATA(cmsg)) = fd;

	return sendmsg(sock, &msgh, MSG_NOSIGNAL);
}

static service_type_t select_service(struct device *dev, const char *interface)
{
	if (!interface) {
		if (dev->sink && avdtp_is_connected(&dev->src, &dev->dst))
			return TYPE_SINK;
		else if (dev->headset && headset_is_active(dev))
			return TYPE_HEADSET;
		else if (dev->sink)
			return TYPE_SINK;
		else if (dev->headset)
			return TYPE_HEADSET;
	} else if (!strcmp(interface, AUDIO_SINK_INTERFACE) && dev->sink)
		return TYPE_SINK;
	else if (!strcmp(interface, AUDIO_HEADSET_INTERFACE) && dev->headset)
		return TYPE_HEADSET;

	return TYPE_NONE;
}

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 unix_client *client = user_data;
	struct a2dp_data *a2dp = &client->d.a2dp;

	switch (new_state) {
	case AVDTP_STATE_IDLE:
		if (a2dp->sep) {
			a2dp_sep_unlock(a2dp->sep, a2dp->session);
			a2dp->sep = NULL;
		}
		client->dev = NULL;
		if (a2dp->session) {
			avdtp_unref(a2dp->session);
			a2dp->session = NULL;
		}
		a2dp->stream = NULL;
		client->cb_id = 0;
		break;
	default:
		break;
	}
}

static int unix_send_cfg(int sock, struct ipc_data_cfg *cfg, int fd)
{
	char buf[IPC_MTU];
	struct ipc_packet *pkt = (void *) buf;
	int len, codec_len;

	memset(buf, 0, sizeof(buf));

	pkt->type = PKT_TYPE_CFG_RSP;

	if (!cfg) {
		pkt->error = EINVAL;
		len = send(sock, pkt, sizeof(struct ipc_packet), 0);
		if (len < 0)
			error("send: %s (%d)", strerror(errno), errno);
		return len;
	}

	debug("fd=%d, fd_opt=%u, pkt_len=%u, sample_size=%u, rate=%u",
						fd, cfg->fd_opt, cfg->pkt_len,
						cfg->sample_size, cfg->rate);

	if (cfg->codec == CFG_CODEC_SBC)
		codec_len = sizeof(struct ipc_codec_sbc);
	else
		codec_len = 0;

	pkt->error = PKT_ERROR_NONE;
	pkt->length = sizeof(struct ipc_data_cfg) + codec_len;
	memcpy(pkt->data, cfg, pkt->length);

	len = sizeof(struct ipc_packet) + pkt->length;
	len = send(sock, pkt, len, 0);
	if (len < 0)
		error("Error %s(%d)", strerror(errno), errno);

	debug("%d bytes sent", len);

	if (fd != -1) {
		len = unix_sendmsg_fd(sock, fd);
		if (len < 0)
			error("Error %s(%d)", strerror(errno), errno);
		debug("%d bytes sent", len);
	}

	return 0;
}

static void headset_setup_complete(struct device *dev, void *user_data)
{
	struct unix_client *client = user_data;
	struct ipc_data_cfg cfg;
	struct headset_data *hs = &client->d.hs;
	int fd;

	client->req_id = 0;

	if (!dev) {
		unix_send_cfg(client->sock, NULL, -1);
		client->dev = NULL;
		return;
	}

	switch (client->fd_opt) {
	case CFG_FD_OPT_READ:
		hs->lock = HEADSET_LOCK_READ;
		break;
	case CFG_FD_OPT_WRITE:
		hs->lock = HEADSET_LOCK_WRITE;
		break;
	case CFG_FD_OPT_READWRITE:
		hs->lock = HEADSET_LOCK_READ | HEADSET_LOCK_WRITE;
		break;
	default:
		hs->lock = 0;
		break;
	}

	if (!headset_lock(dev, hs->lock)) {
		error("Unable to lock headset");
		unix_send_cfg(client->sock, NULL, -1);
		client->dev = NULL;
		return;
	}

	memset(&cfg, 0, sizeof(cfg));

	cfg.fd_opt = client->fd_opt;
	cfg.codec = CFG_CODEC_SCO;
	cfg.mode = CFG_MODE_MONO;
	cfg.pkt_len = 48;
	cfg.sample_size = 2;
	cfg.rate = 8000;

	fd = headset_get_sco_fd(dev);

	unix_send_cfg(client->sock, &cfg, fd);
}

static void a2dp_setup_complete(struct avdtp *session, struct a2dp_sep *sep,
					struct avdtp_stream *stream,
					void *user_data)
{
	struct unix_client *client = user_data;
	char buf[sizeof(struct ipc_data_cfg) + sizeof(struct ipc_codec_sbc)];
	struct ipc_data_cfg *cfg = (void *) buf;
	struct avdtp_service_capability *cap;
	struct avdtp_media_codec_capability *codec_cap;
	struct sbc_codec_cap *sbc_cap;
	struct ipc_codec_sbc *sbc = (void *) cfg->data;
	struct a2dp_data *a2dp = &client->d.a2dp;
	int fd;
	GSList *caps;

	client->req_id = 0;

	if (!stream)
		goto failed;

	if (!a2dp_sep_lock(sep, session)) {
		error("Unable to lock A2DP source SEP");
		goto failed;
	}

	a2dp->sep = sep;
	a2dp->stream = stream;

	if (!avdtp_stream_get_transport(stream, &fd, &cfg->pkt_len, &caps)) {
		error("Unable to get stream transport");
		goto failed;
	}

	for (codec_cap = NULL; caps; caps = g_slist_next(caps)) {
		cap = caps->data;
		if (cap->category == AVDTP_MEDIA_CODEC) {
			codec_cap = (void *) cap->data;
			break;
		}
	}

	if (codec_cap == NULL ||
			codec_cap->media_codec_type != A2DP_CODEC_SBC) {
		error("Unable to find matching codec capability");
		goto failed;
	}

	cfg->fd_opt = CFG_FD_OPT_WRITE;

	sbc_cap = (void *) codec_cap;
	cfg->sample_size = 2;

	switch (sbc_cap->channel_mode) {
	case A2DP_CHANNEL_MODE_MONO:
		cfg->mode = CFG_MODE_MONO;
		break;
	case A2DP_CHANNEL_MODE_DUAL_CHANNEL:
		cfg->mode = CFG_MODE_DUAL_CHANNEL;
		break;
	case A2DP_CHANNEL_MODE_STEREO:
		cfg->mode = CFG_MODE_STEREO;
		break;
	case A2DP_CHANNEL_MODE_JOINT_STEREO:
		cfg->mode = CFG_MODE_JOINT_STEREO;
		break;
	}

	switch (sbc_cap->frequency) {
	case A2DP_SAMPLING_FREQ_16000:
		cfg->rate = 16000;
		break;
	case A2DP_SAMPLING_FREQ_32000:
		cfg->rate = 32000;
		break;
	case A2DP_SAMPLING_FREQ_44100:
		cfg->rate = 44100;
		break;
	case A2DP_SAMPLING_FREQ_48000:
		cfg->rate = 48000;
		break;
	}

	cfg->codec = CFG_CODEC_SBC;
	sbc->allocation = sbc_cap->allocation_method == A2DP_ALLOCATION_SNR ?
								0x01 : 0x00;
	sbc->subbands = sbc_cap->subbands == A2DP_SUBBANDS_4 ? 4 : 8;

	switch (sbc_cap->block_length) {
	case A2DP_BLOCK_LENGTH_4:
		sbc->blocks = 4;
		break;
	case A2DP_BLOCK_LENGTH_8:
		sbc->blocks = 8;
		break;
	case A2DP_BLOCK_LENGTH_12:
		sbc->blocks = 12;
		break;
	case A2DP_BLOCK_LENGTH_16:
		sbc->blocks = 16;
		break;
	}

	sbc->bitpool = sbc_cap->max_bitpool;

	unix_send_cfg(client->sock, cfg, fd);

	client->cb_id = avdtp_stream_add_cb(session, stream,
						stream_state_changed, client);

	return;

failed:
	error("stream setup failed");
	if (a2dp->sep) {
		a2dp_sep_unlock(a2dp->sep, a2dp->session);
		a2dp->sep = NULL;
	}
	unix_send_cfg(client->sock, NULL, -1);

	avdtp_unref(a2dp->session);

	a2dp->session = NULL;