> ACL Data RX: Handle 256 flags 0x02 dlen 20 [hci0] 9.242155
Channel: 66 len 16 [PSM 25 mode 0] {chan 2}
AVDTP: Get Capabilities (0x02) Response Accept (0x02) type 0x00 label 1 nosp 0
Service Category: Media Transport (0x01)
Service Category: Media Codec (0x07)
Media Type: Audio (0x00)
Media Codec: SBC (0x00)
Frequency: 0x30
44100
48000
Channel Mode: 0x0f
Mono
Dual Channel
Stereo
Joint Channel
Block Length: 0xf0
4
8
12
16
Subbands: 0x0c
4
8
Allocation Method: 0x03
SNR
Loudness
Minimum Bitpool: 2
Maximum Bitpool: 53
Service Category: Content Protection (0x04)
Content Protection Type: SCMS-T (0x0002)
< ACL Data TX: Handle 256 flags 0x00 dlen 18 [hci0] 9.272120
Channel: 258 len 14 [PSM 25 mode 0] {chan 2}
AVDTP: Set Configuration (0x03) Command (0x00) type 0x00 label 5 nosp 0
ACP SEID: 1
INT SEID: 3
Service Category: Media Transport (0x01)
Service Category: Media Codec (0x07)
Media Type: Audio (0x00)
Media Codec: SBC (0x00)
Frequency: 44100 (0x20)
Channel Mode: Joint Channel (0x01)
Block Length: 16 (0x10)
Subbands: 8 (0x04)
Allocation Method: Loudness (0x01)
Minimum Bitpool: 2
Maximum Bitpool: 53
---
Makefile.tools | 1 +
android/Android.mk | 1 +
monitor/a2dp.c | 217 +++++++++++++++++++++++++++++++++++++++++++++++++++++
monitor/a2dp.h | 26 +++++++
monitor/avdtp.c | 18 +++--
5 files changed, 257 insertions(+), 6 deletions(-)
create mode 100644 monitor/a2dp.c
create mode 100644 monitor/a2dp.h
diff --git a/Makefile.tools b/Makefile.tools
index 387917e..46cdb53 100644
--- a/Makefile.tools
+++ b/Makefile.tools
@@ -28,6 +28,7 @@ monitor_btmon_SOURCES = monitor/main.c monitor/bt.h \
monitor/sdp.h monitor/sdp.c \
monitor/avctp.h monitor/avctp.c \
monitor/avdtp.h monitor/avdtp.c \
+ monitor/a2dp.h monitor/a2dp.c \
monitor/rfcomm.h monitor/rfcomm.c \
monitor/bnep.h monitor/bnep.c \
monitor/uuid.h monitor/uuid.c \
diff --git a/android/Android.mk b/android/Android.mk
index fa1188b..38ef4aa 100644
--- a/android/Android.mk
+++ b/android/Android.mk
@@ -340,6 +340,7 @@ LOCAL_SRC_FILES := \
bluez/monitor/l2cap.c \
bluez/monitor/avctp.c \
bluez/monitor/avdtp.c \
+ bluez/monitor/a2dp.c \
bluez/monitor/rfcomm.c \
bluez/monitor/bnep.c \
bluez/monitor/uuid.c \
diff --git a/monitor/a2dp.c b/monitor/a2dp.c
new file mode 100644
index 0000000..2ef5889
--- /dev/null
+++ b/monitor/a2dp.c
@@ -0,0 +1,217 @@
+/*
+ *
+ * BlueZ - Bluetooth protocol stack for Linux
+ *
+ * Copyright (C) 2015 Andrzej Kaczmarek <andrzej.kaczmarek@xxxxxxxxxxx>
+ *
+ *
+ * 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;
+ 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 Channel" },
+ { }
+};
+
+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 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))
+ 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))
+ 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;
+}
+
+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);
+ 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);
+ default:
+ packet_hexdump(frame->data, losc);
+ l2cap_frame_pull(frame, frame, losc);
+ return true;
+ }
+}
diff --git a/monitor/a2dp.h b/monitor/a2dp.h
new file mode 100644
index 0000000..72a8f1f
--- /dev/null
+++ b/monitor/a2dp.h
@@ -0,0 +1,26 @@
+/*
+ *
+ * BlueZ - Bluetooth protocol stack for Linux
+ *
+ * Copyright (C) 2015 Andrzej Kaczmarek <andrzej.kaczmarek@xxxxxxxxxxx>
+ *
+ *
+ * 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
+ *
+ */
+
+bool a2dp_codec_cap(uint8_t codec, uint8_t losc, struct l2cap_frame *frame);
+
+bool a2dp_codec_cfg(uint8_t codec, uint8_t losc, struct l2cap_frame *frame);
diff --git a/monitor/avdtp.c b/monitor/avdtp.c
index ed0d792..e9a355e 100644
--- a/monitor/avdtp.c
+++ b/monitor/avdtp.c
@@ -37,6 +37,7 @@
#include "display.h"
#include "l2cap.h"
#include "avdtp.h"
+#include "a2dp.h"
/* Signal Identifiers */
#define AVDTP_DISCOVER 0x01
@@ -69,6 +70,13 @@ struct avdtp_frame {
struct l2cap_frame l2cap_frame;
};
+static inline bool is_configuration_sig_id(uint8_t sig_id)
+{
+ return (sig_id == AVDTP_SET_CONFIGURATION) ||
+ (sig_id == AVDTP_GET_CONFIGURATION) ||
+ (sig_id == AVDTP_RECONFIGURE);
+}
+
static const char *msgtype2str(uint8_t msgtype)
{
switch (msgtype) {
@@ -286,12 +294,10 @@ static bool service_media_codec(struct avdtp_frame *avdtp_frame, uint8_t losc)
print_field("%*cMedia Codec: %s (0x%02x)", 2, ' ',
mediacodec2str(codec), codec);
- /* TODO: decode codec specific information */
-
- packet_hexdump(frame->data, losc);
- l2cap_frame_pull(frame, frame, losc);
-
- return true;
+ if (is_configuration_sig_id(avdtp_frame->sig_id))
+ return a2dp_codec_cfg(codec, losc, frame);
+ else
+ return a2dp_codec_cap(codec, losc, frame);
}
static bool decode_capabilities(struct avdtp_frame *avdtp_frame)
--
2.6.2
--
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