avinfo.c

BlueZ源码

	printf("\n\t\tPayload Format: ");
	if (mpeg->mpf)
		printf("RFC-2250 RFC-3119\n");
	else
		printf("RFC-2250\n");
}

static void print_sbc(struct sbc_codec_cap *sbc)
{
	printf("\tMedia Codec: SBC\n\t\tChannel Modes: ");

	if (sbc->channel_mode & SBC_CHANNEL_MODE_MONO)
		printf("Mono ");
	if (sbc->channel_mode & SBC_CHANNEL_MODE_DUAL_CHANNEL)
		printf("DualChannel ");
	if (sbc->channel_mode & SBC_CHANNEL_MODE_STEREO)
		printf("Stereo ");
	if (sbc->channel_mode & SBC_CHANNEL_MODE_JOINT_STEREO)
		printf("JointStereo");

	printf("\n\t\tFrequencies: ");
	if (sbc->frequency & SBC_SAMPLING_FREQ_16000)
		printf("16Khz ");
	if (sbc->frequency & SBC_SAMPLING_FREQ_32000)
		printf("32Khz ");
	if (sbc->frequency & SBC_SAMPLING_FREQ_44100)
		printf("44.1Khz ");
	if (sbc->frequency & SBC_SAMPLING_FREQ_48000)
		printf("48Khz ");

	printf("\n\t\tSubbands: ");
	if (sbc->allocation_method & SBC_SUBBANDS_4)
		printf("4 ");
	if (sbc->allocation_method & SBC_SUBBANDS_8)
		printf("8");

	printf("\n\t\tBlocks: ");
	if (sbc->block_length & SBC_BLOCK_LENGTH_4)
		printf("4 ");
	if (sbc->block_length & SBC_BLOCK_LENGTH_8)
		printf("8 ");
	if (sbc->block_length & SBC_BLOCK_LENGTH_12)
		printf("12 ");
	if (sbc->block_length & SBC_BLOCK_LENGTH_16)
		printf("16 ");

	printf("\n\t\tBitpool Range: %d-%d\n",
				sbc->min_bitpool, sbc->max_bitpool);
}

static void print_media_codec(struct avdtp_media_codec_capability *cap)
{
	switch (cap->media_codec_type) {
	case A2DP_CODEC_SBC:
		print_sbc((void *) cap);
		break;
	case A2DP_CODEC_MPEG12:
		print_mpeg12((void *) cap);
		break;
	default:
		printf("\tMedia Codec: Unknown\n");
	}
}

static void print_caps(void *data, int size)
{
	int processed;

	for (processed = 0; processed + 2 < size;) {
		struct avdtp_service_capability *cap;

		cap = data;

		if (processed + 2 + cap->length > size) {
			printf("Invalid capability data in getcap resp\n");
			break;
		}

		switch (cap->category) {
		case AVDTP_MEDIA_TRANSPORT:
		case AVDTP_REPORTING:
		case AVDTP_RECOVERY:
		case AVDTP_CONTENT_PROTECTION:
		case AVDTP_MULTIPLEXING:
			/* FIXME: Add proper functions */
			break;
		case AVDTP_MEDIA_CODEC:
			print_media_codec((void *) cap->data);
			break;
		}

		processed += 2 + cap->length;
		data += 2 + cap->length;
	}
}

static void init_request(struct avdtp_header *header, int request_id)
{
	static int transaction = 0;

	header->packet_type = AVDTP_PKT_TYPE_SINGLE;
	header->message_type = AVDTP_MSG_TYPE_COMMAND;
	header->transaction = transaction;
	header->signal_id = request_id;

	/* clear rfa bits */
	header->rfa0 = 0;

	transaction = (transaction + 1) % 16;
}

static int avdtp_send(int sk, void *data, int len)
{
	int ret;

	ret = send(sk, data, len, 0);

	if (ret < 0)
		ret = -errno;
	else if (ret != len)
		ret = -EIO;

	if (ret < 0) {
		printf("Unable to send message: %s (%d)\n",
						strerror(-ret), -ret);
		return ret;
	}

	return ret;
}

static int avdtp_receive(int sk, void *data, int len)
{
	int ret;

	ret = recv(sk, data, len, 0);

	if (ret < 0) {
		printf("Unable to receive message: %s (%d)\n",
						strerror(errno), errno);
		return -errno;
	}

	return ret;
}

int avdtp_get_caps(int sk, int seid)
{
	struct seid_req req;
	char buffer[1024];
	struct getcap_resp *caps = (void *) buffer;
	int ret;

	memset(&req, 0, sizeof(req));
	init_request(&req.header, AVDTP_GET_CAPABILITIES);
	req.acp_seid = seid;

	ret = avdtp_send(sk, &req, sizeof(req));
	if (ret < 0)
		return ret;

	memset(&buffer, 0, sizeof(buffer));
	ret = avdtp_receive(sk, caps, sizeof(buffer));
	if (ret < 0)
		return ret;

	if (ret < (sizeof(struct getcap_resp) + 4 +
			sizeof(struct avdtp_media_codec_capability))) {
		printf("Invalid capabilities\n");
		return -1;
	}

	print_caps(caps, ret);

	return 0;
}

int avdtp_discover(int sk)
{
	struct avdtp_header req;
	char buffer[256];
	struct discover_resp *discover = (void *) buffer;
	int ret, seps, i;

	memset(&req, 0, sizeof(req));
	init_request(&req, AVDTP_DISCOVER);

	ret = avdtp_send(sk, &req, sizeof(req));
	if (ret < 0)
		return ret;

	memset(&buffer, 0, sizeof(buffer));
	ret = avdtp_receive(sk, discover, sizeof(buffer));
	if (ret < 0)
		return ret;

	seps = (ret - sizeof(struct avdtp_header)) / sizeof(struct seid_info);
	for (i = 0; i < seps; i++) {
		const char *type, *media;

		switch (discover->seps[i].type) {
		case AVDTP_SEP_TYPE_SOURCE:
			type = "Source";
			break;
		case AVDTP_SEP_TYPE_SINK:
			type = "Sink";
			break;
		default:
			type = "Invalid";
		}

		switch (discover->seps[i].media_type) {
		case AVDTP_MEDIA_TYPE_AUDIO:
			media = "Audio";
			break;
		case AVDTP_MEDIA_TYPE_VIDEO:
			media = "Video";
			break;
		case AVDTP_MEDIA_TYPE_MULTIMEDIA:
			media = "Multimedia";
			break;
		default:
			media = "Invalid";
		}

		printf("Stream End-Point #%d: %s %s %s\n",
					discover->seps[i].seid, media, type,
					discover->seps[i].inuse ? "*" : "");

		avdtp_get_caps(sk, discover->seps[i].seid);
	}

	return 0;
}

static int l2cap_connect(bdaddr_t *src, bdaddr_t *dst)
{
	struct sockaddr_l2 l2a;
	int sk;

	memset(&l2a, 0, sizeof(l2a));
	l2a.l2_family = AF_BLUETOOTH;
	bacpy(&l2a.l2_bdaddr, src);

	sk = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
	if (sk < 0) {
		printf("Cannot create L2CAP socket. %s(%d)\n", strerror(errno),
				errno);
		return -errno;
	}

	if (bind(sk, (struct sockaddr *) &l2a, sizeof(l2a)) < 0) {
		printf("Bind failed. %s (%d)\n", strerror(errno), errno);
		return -errno;
	}

	memset(&l2a, 0, sizeof(l2a));
	l2a.l2_family = AF_BLUETOOTH;
	bacpy(&l2a.l2_bdaddr, dst);
	l2a.l2_psm = htobs(AVDTP_PSM);

	if (connect(sk, (struct sockaddr *) &l2a, sizeof(l2a)) < 0) {
		printf("Connect failed. %s(%d)\n", strerror(errno), errno);
		return -errno;
	}

	return sk;
}

static void usage()
{
	printf("avinfo - Audio/Video Info Tool ver %s\n", VERSION);
	printf("Usage:\n"
		"\tavinfo [options] <remote address>\n");
	printf("Options:\n"
		"\t-h\t\tDisplay help\n"
		"\t-i\t\tSpecify source interface\n");
}

static struct option main_options[] = {
	{ "help",	0, 0, 'h' },
	{ "device",	1, 0, 'i' },
	{ 0, 0, 0, 0 }
};

int main(int argc, char *argv[])
{
	bdaddr_t src, dst;
	int opt, sk, dev_id;

	if (argc < 2) {
		usage();
		exit(0);
	}

	bacpy(&src, BDADDR_ANY);
	dev_id = hci_get_route(&src);
	if ((dev_id < 0) || (hci_devba(dev_id, &src) < 0)) {
		printf("Cannot find any local adapter\n");
		exit(-1);
	}

	while ((opt = getopt_long(argc, argv, "+i:h", main_options, NULL)) != -1) {
		switch (opt) {
		case 'i':
			if (!strncmp(optarg, "hci", 3))
				hci_devba(atoi(optarg + 3), &src);
			else
				str2ba(optarg, &src);
			break;

		case 'h':
		default:
			usage();
			exit(0);
		}
	}

	printf("Connecting ... \n");

	if (bachk(argv[optind]) < 0) {
		printf("Invalid argument\n");
		exit(1);
	}

	str2ba(argv[optind], &dst);
	sk = l2cap_connect(&src, &dst);
	if (sk < 0)
		exit(1);

	if (avdtp_discover(sk) < 0)
		exit(1);

	return 0;
}