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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2015 Andrzej Kaczmarek <andrzej.kaczmarek@codecoup.pl>
*
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lib/bluetooth.h"
#include "src/shared/util.h"
#include "bt.h"
#include "packet.h"
#include "display.h"
#include "l2cap.h"
#include "a2dp.h"
#define BASE_INDENT 4
/* Codec Types */
#define A2DP_CODEC_SBC 0x00
#define A2DP_CODEC_MPEG12 0x01
#define A2DP_CODEC_MPEG24 0x02
#define A2DP_CODEC_ATRAC 0x04
#define A2DP_CODEC_VENDOR 0xff
struct bit_desc {
uint8_t bit_num;
const char *str;
};
static const struct bit_desc sbc_frequency_table[] = {
{ 7, "16000" },
{ 6, "32000" },
{ 5, "44100" },
{ 4, "48000" },
{ }
};
static const struct bit_desc sbc_channel_mode_table[] = {
{ 3, "Mono" },
{ 2, "Dual Channel" },
{ 1, "Stereo" },
{ 0, "Joint Stereo" },
{ }
};
static const struct bit_desc sbc_blocklen_table[] = {
{ 7, "4" },
{ 6, "8" },
{ 5, "12" },
{ 4, "16" },
{ }
};
static const struct bit_desc sbc_subbands_table[] = {
{ 3, "4" },
{ 2, "8" },
{ }
};
static const struct bit_desc sbc_allocation_table[] = {
{ 1, "SNR" },
{ 0, "Loudness" },
{ }
};
static const struct bit_desc mpeg12_layer_table[] = {
{ 7, "Layer I (mp1)" },
{ 6, "Layer II (mp2)" },
{ 5, "Layer III (mp3)" },
{ }
};
static const struct bit_desc mpeg12_channel_mode_table[] = {
{ 3, "Mono" },
{ 2, "Dual Channel" },
{ 1, "Stereo" },
{ 0, "Joint Stereo" },
{ }
};
static const struct bit_desc mpeg12_frequency_table[] = {
{ 5, "16000" },
{ 4, "22050" },
{ 3, "24000" },
{ 2, "32000" },
{ 1, "44100" },
{ 0, "48000" },
{ }
};
static const struct bit_desc mpeg12_bitrate_table[] = {
{ 14, "1110" },
{ 13, "1101" },
{ 12, "1100" },
{ 11, "1011" },
{ 10, "1010" },
{ 9, "1001" },
{ 8, "1000" },
{ 7, "0111" },
{ 6, "0110" },
{ 5, "0101" },
{ 4, "0100" },
{ 3, "0011" },
{ 2, "0010" },
{ 1, "0001" },
{ 0, "0000" },
{ }
};
static void print_value_bits(uint8_t indent, uint32_t value,
const struct bit_desc *table)
{
int i;
for (i = 0; table[i].str; i++) {
if (value & (1 << table[i].bit_num))
print_field("%*c%s", indent + 2, ' ', table[i].str);
}
}
static const char *find_value_bit(uint32_t value,
const struct bit_desc *table)
{
int i;
for (i = 0; table[i].str; i++) {
if (value & (1 << table[i].bit_num))
return table[i].str;
}
return "Unknown";
}
static bool codec_sbc_cap(uint8_t losc, struct l2cap_frame *frame)
{
uint8_t cap = 0;
if (losc != 4)
return false;
l2cap_frame_get_u8(frame, &cap);
print_field("%*cFrequency: 0x%02x", BASE_INDENT, ' ', cap & 0xf0);
print_value_bits(BASE_INDENT, cap & 0xf0, sbc_frequency_table);
print_field("%*cChannel Mode: 0x%02x", BASE_INDENT, ' ', cap & 0x0f);
print_value_bits(BASE_INDENT, cap & 0x0f, sbc_channel_mode_table);
l2cap_frame_get_u8(frame, &cap);
print_field("%*cBlock Length: 0x%02x", BASE_INDENT, ' ', cap & 0xf0);
print_value_bits(BASE_INDENT, cap & 0xf0, sbc_blocklen_table);
print_field("%*cSubbands: 0x%02x", BASE_INDENT, ' ', cap & 0x0c);
print_value_bits(BASE_INDENT, cap & 0x0c, sbc_subbands_table);
print_field("%*cAllocation Method: 0x%02x", BASE_INDENT, ' ',
cap & 0x03);
print_value_bits(BASE_INDENT, cap & 0x03, sbc_allocation_table);
l2cap_frame_get_u8(frame, &cap);
print_field("%*cMinimum Bitpool: %d", BASE_INDENT, ' ', cap);
l2cap_frame_get_u8(frame, &cap);
print_field("%*cMaximum Bitpool: %d", BASE_INDENT, ' ', cap);
return true;
}
static bool codec_sbc_cfg(uint8_t losc, struct l2cap_frame *frame)
{
uint8_t cap = 0;
if (losc != 4)
return false;
l2cap_frame_get_u8(frame, &cap);
print_field("%*cFrequency: %s (0x%02x)", BASE_INDENT, ' ',
find_value_bit(cap & 0xf0, sbc_frequency_table),
cap & 0xf0);
print_field("%*cChannel Mode: %s (0x%02x)", BASE_INDENT, ' ',
find_value_bit(cap & 0x0f, sbc_channel_mode_table),
cap & 0x0f);
l2cap_frame_get_u8(frame, &cap);
print_field("%*cBlock Length: %s (0x%02x)", BASE_INDENT, ' ',
find_value_bit(cap & 0xf0, sbc_blocklen_table),
cap & 0xf0);
print_field("%*cSubbands: %s (0x%02x)", BASE_INDENT, ' ',
find_value_bit(cap & 0x0c, sbc_subbands_table),
cap & 0x0c);
print_field("%*cAllocation Method: %s (0x%02x)", BASE_INDENT, ' ',
find_value_bit(cap & 0x03, sbc_allocation_table),
cap & 0x03);
l2cap_frame_get_u8(frame, &cap);
print_field("%*cMinimum Bitpool: %d", BASE_INDENT, ' ', cap);
l2cap_frame_get_u8(frame, &cap);
print_field("%*cMaximum Bitpool: %d", BASE_INDENT, ' ', cap);
return true;
}
static bool codec_mpeg12_cap(uint8_t losc, struct l2cap_frame *frame)
{
uint16_t cap = 0;
uint8_t layer;
uint8_t chan;
uint8_t freq;
uint16_t bitrate;
bool crc, mpf, vbr;
if (losc != 4)
return false;
l2cap_frame_get_be16(frame, &cap);
layer = (cap >> 8) & 0xe0;
crc = cap & 0x1000;
chan = (cap >> 8) & 0x0f;
mpf = cap & 0x0040;
freq = cap & 0x003f;
l2cap_frame_get_be16(frame, &cap);
vbr = cap & 0x8000;
bitrate = cap & 0x7fff;
print_field("%*cLayer: 0x%02x", BASE_INDENT, ' ', layer);
print_value_bits(BASE_INDENT, layer, mpeg12_layer_table);
print_field("%*cCRC: %s", BASE_INDENT, ' ', crc ? "Yes" : "No");
print_field("%*cChannel Mode: 0x%02x", BASE_INDENT, ' ', chan);
print_value_bits(BASE_INDENT, chan, mpeg12_channel_mode_table);
print_field("%*cMedia Payload Format: %s", BASE_INDENT, ' ',
mpf ? "RFC-2250 RFC-3119" : "RFC-2250");
print_field("%*cFrequency: 0x%02x", BASE_INDENT, ' ', freq);
print_value_bits(BASE_INDENT, freq, mpeg12_frequency_table);
if (!vbr) {
print_field("%*cBitrate Index: 0x%04x", BASE_INDENT, ' ',
bitrate);
print_value_bits(BASE_INDENT, freq, mpeg12_bitrate_table);
}
print_field("%*cVBR: %s", BASE_INDENT, ' ', vbr ? "Yes" : "No");
return true;
}
static bool codec_mpeg12_cfg(uint8_t losc, struct l2cap_frame *frame)
{
uint16_t cap = 0;
uint8_t layer;
uint8_t chan;
uint8_t freq;
uint16_t bitrate;
bool crc, mpf, vbr;
if (losc != 4)
return false;
l2cap_frame_get_be16(frame, &cap);
layer = (cap >> 8) & 0xe0;
crc = cap & 0x1000;
chan = (cap >> 8) & 0x0f;
mpf = cap & 0x0040;
freq = cap & 0x003f;
l2cap_frame_get_be16(frame, &cap);
vbr = cap & 0x8000;
bitrate = cap & 0x7fff;
print_field("%*cLayer: %s (0x%02x)", BASE_INDENT, ' ',
find_value_bit(layer, mpeg12_layer_table),
layer);
print_field("%*cCRC: %s", BASE_INDENT, ' ', crc ? "Yes" : "No");
print_field("%*cChannel Mode: %s (0x%02x)", BASE_INDENT, ' ',
find_value_bit(chan, mpeg12_channel_mode_table),
chan);
print_field("%*cMedia Payload Format: %s", BASE_INDENT, ' ',
mpf ? "RFC-2250 RFC-3119" : "RFC-2250");
print_field("%*cFrequency: %s (0x%02x)", BASE_INDENT, ' ',
find_value_bit(freq, mpeg12_frequency_table),
freq);
if (!vbr)
print_field("%*cBitrate Index: %s (0x%04x)", BASE_INDENT, ' ',
find_value_bit(freq, mpeg12_bitrate_table),
bitrate);
print_field("%*cVBR: %s", BASE_INDENT, ' ', vbr ? "Yes" : "No");
return true;
}
bool a2dp_codec_cap(uint8_t codec, uint8_t losc, struct l2cap_frame *frame)
{
switch (codec) {
case A2DP_CODEC_SBC:
return codec_sbc_cap(losc, frame);
case A2DP_CODEC_MPEG12:
return codec_mpeg12_cap(losc, frame);
default:
packet_hexdump(frame->data, losc);
l2cap_frame_pull(frame, frame, losc);
return true;
}
}
bool a2dp_codec_cfg(uint8_t codec, uint8_t losc, struct l2cap_frame *frame)
{
switch (codec) {
case A2DP_CODEC_SBC:
return codec_sbc_cfg(losc, frame);
case A2DP_CODEC_MPEG12:
return codec_mpeg12_cfg(losc, frame);
default:
packet_hexdump(frame->data, losc);
l2cap_frame_pull(frame, frame, losc);
return true;
}
}
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