Re: [Bluez-devel] AVDTP socket?

[Brad Midgley <bmidgley@xmission.com>]

Marcel,

I added rcplay.c to cvs and made you a developer on bluetooth-alsa so 
you can tweak things if you see fit.

The bluetake sometimes works and sometimes doesn't when using a2play. 
The same stream will work a couple of times and then it produces loud 
white noise. There is probably something still not quite right.

I disabled this section in a2dp.c

   memset(buf, 0, 12);
   buf[0] = 0x80;
   buf[2] = seq_num >> 8;
   buf[3] = seq_num & 0xff;
   buf[12] = 0x0ff;
   buf[13] = 0x0ff;
   memcpy(buf + 14, &sbc_info, sizeof(sbc_info));
   size = read(fd, buf + 14 + sizeof(sbc_info), mtu - sizeof(sbc_info) - 
14);
   write(streamfd, buf, size + 14 + sizeof(sbc_info));
   seq_num++;

but it didn't help or hurt. I couldn't see why sbc_info was being 
written to the stream since I thought it was just a file header. Does 
your headset work with a2play as it is in cvs now?

Brad

Marcel Holtmann wrote:
> Hi Brad,
> 
> 
>>actually like with the attached patch. Most of the example *.sbc files
>>are working. Some of them are not working and this is maybe because the
>>frame header information don't matches the SBC configuration. Or maybe
>>hcidump is decoding this wrong.
> 
> 
> and I figured out what the extra RFCOMM channel 1 on my Aiptek headphone
> does. You can simply stream the SBC files over it. The attached program
> will do this for you, but actually it only works on streams with two
> channels. I don't know what to change to support all test SBC files.
> 
> Regards
> 
> Marcel
> 
> 
> 
> ------------------------------------------------------------------------
> 
> /*
>  *
>  *  Stream SBC files over RFCOMM
>  *
>  *  Copyright (C) 2004  Marcel Holtmann <marcel@holtmann.org>
>  *
>  *
>  *  This program is free software; you can redistribute it and/or modify
>  *  it under the terms of the GNU General Public License version 2 as
>  *  published by the Free Software Foundation;
>  *
>  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
>  *  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
>  *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
>  *  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
>  *  CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 
>  *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 
>  *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 
>  *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
>  *
>  *  ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 
>  *  COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 
>  *  SOFTWARE IS DISCLAIMED.
>  *
>  */
> 
> #include <stdio.h>
> #include <errno.h>
> #include <fcntl.h>
> #include <sys/socket.h>
> 
> #include <bluetooth/bluetooth.h>
> #include <bluetooth/rfcomm.h>
> 
> static int rfcomm_connect(bdaddr_t *src, bdaddr_t *dst, uint8_t channel)
> {
> 	struct sockaddr_rc addr;
> 	int sk;
> 
> 	sk = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
> 	if (sk < 0)
> 		return -1;
> 
> 	memset(&addr, 0, sizeof(addr));
> 	addr.rc_family = AF_BLUETOOTH;
> 	bacpy(&addr.rc_bdaddr, src);
> 	if (bind(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
> 		close(sk);
> 		return -1;
> 	}
> 
> 	memset(&addr, 0, sizeof(addr));
> 	addr.rc_family = AF_BLUETOOTH;
> 	bacpy(&addr.rc_bdaddr, dst);
> 	addr.rc_channel = channel;
> 	if (connect(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
> 		close(sk);
> 		return -1;
> 	}
> 
> 	return sk;
> }
> 
> static int stream_sbc(fd, sk)
> {
> 	unsigned char buf[330];
> 	int err, len;
> 
> 	while (1) {
> 		len = read(fd, buf, sizeof(buf));
> 		if (len <= 0)
> 			break;
> 
> 		err = write(sk, buf, len);
> 		if (err < 0)
> 			break;
> 	}
> 
> 	return 0;
> }
> 
> int main(int argc, char *argv[])
> {
> 	bdaddr_t bdaddr;
> 	int fd, sk;
> 
> 	if (argc < 3) {
> 		fprintf(stderr, "Usage: rcplay <bdaddr> <filename>\n");
> 		exit(1);
> 	}
> 
> 	str2ba(argv[1], &bdaddr);
> 
> 	fd = open(argv[2], O_RDONLY);
> 	if (fd < 0) {
> 		perror("Can't open file");
> 		exit(1);
> 	}
> 
> 	sk = rfcomm_connect(BDADDR_ANY, &bdaddr, 1);
> 	if (sk < 0) {
> 		perror("Can't open connection");
> 		close(fd);
> 		exit(1);
> 	}
> 
> 	stream_sbc(fd, sk);
> 
> 	close(sk);
> 	close(fd);
> 
> 	return 0;
> }


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