> ACL Data RX: Handle 12 flags 0x02 dlen 22 4.565591
Channel: 67 len 18 [PSM 25 mode 0] {chan 1}
AVDTP: Get Capabilities (0x02) Response Accept (0x02) type 0x00 label 4 nosp 0
Service Category: Media Transport (0x01)
Service Category: Media Codec (0x07)
Media Type: Audio (0x00)
Media Codec: MPEG-2,4 AAC (0x02)
Object Type: 0xc0
MPEG-2 AAC LC
MPEG-4 AAC LC
Frequency: 0x180
44100
48000
Channels: 0x0c
1
2
Bitrate: 320000bps
VBR: Yes
Service Category: Content Protection (0x04)
Content Protection Type: SCMS-T (0x0002)
---
monitor/a2dp.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 124 insertions(+)
diff --git a/monitor/a2dp.c b/monitor/a2dp.c
index effdfe7..51fffd4 100644
--- a/monitor/a2dp.c
+++ b/monitor/a2dp.c
@@ -132,6 +132,40 @@ static const struct bit_desc mpeg12_bitrate_table[] = {
{ }
};
+static const struct bit_desc aac_object_type_table[] = {
+ { 7, "MPEG-2 AAC LC" },
+ { 6, "MPEG-4 AAC LC" },
+ { 5, "MPEG-4 AAC LTP" },
+ { 4, "MPEG-4 AAC scalable" },
+ { 3, "RFA (b3)" },
+ { 2, "RFA (b2)" },
+ { 1, "RFA (b1)" },
+ { 0, "RFA (b0)" },
+ { }
+};
+
+static const struct bit_desc aac_frequency_table[] = {
+ { 15, "8000" },
+ { 14, "11025" },
+ { 13, "12000" },
+ { 12, "16000" },
+ { 11, "22050" },
+ { 10, "24000" },
+ { 9, "32000" },
+ { 8, "44100" },
+ { 7, "48000" },
+ { 6, "64000" },
+ { 5, "88200" },
+ { 4, "96000" },
+ { }
+};
+
+static const struct bit_desc aac_channels_table[] = {
+ { 3, "1" },
+ { 2, "2" },
+ { }
+};
+
static void print_value_bits(uint8_t indent, uint32_t value,
const struct bit_desc *table)
{
@@ -338,6 +372,92 @@ static bool codec_mpeg12_cfg(uint8_t losc, struct l2cap_frame *frame)
return true;
}
+static bool codec_aac_cap(uint8_t losc, struct l2cap_frame *frame)
+{
+ uint16_t cap = 0;
+ uint8_t type;
+ uint16_t freq;
+ uint8_t chan;
+ uint32_t bitrate;
+ bool vbr;
+
+ if (losc != 6)
+ return false;
+
+ l2cap_frame_get_be16(frame, &cap);
+
+ type = cap >> 8;
+ freq = cap << 8;
+
+ l2cap_frame_get_be16(frame, &cap);
+
+ freq |= (cap >> 8) & 0xf0;
+ chan = (cap >> 8) & 0x0c;
+ bitrate = (cap << 16) & 0x7f0000;
+ vbr = cap & 0x0080;
+
+ l2cap_frame_get_be16(frame, &cap);
+
+ bitrate |= cap;
+
+ print_field("%*cObject Type: 0x%02x", BASE_INDENT, ' ', type);
+ print_value_bits(BASE_INDENT, type, aac_object_type_table);
+
+ print_field("%*cFrequency: 0x%02x", BASE_INDENT, ' ', freq);
+ print_value_bits(BASE_INDENT, freq, aac_frequency_table);
+
+ print_field("%*cChannels: 0x%02x", BASE_INDENT, ' ', chan);
+ print_value_bits(BASE_INDENT, chan, aac_channels_table);
+
+ print_field("%*cBitrate: %ubps", BASE_INDENT, ' ', bitrate);
+ print_field("%*cVBR: %s", BASE_INDENT, ' ', vbr ? "Yes" : "No");
+
+ return true;
+}
+
+static bool codec_aac_cfg(uint8_t losc, struct l2cap_frame *frame)
+{
+ uint16_t cap = 0;
+ uint8_t type;
+ uint16_t freq;
+ uint8_t chan;
+ uint32_t bitrate;
+ bool vbr;
+
+ if (losc != 6)
+ return false;
+
+ l2cap_frame_get_be16(frame, &cap);
+
+ type = cap >> 8;
+ freq = cap << 8;
+
+ l2cap_frame_get_be16(frame, &cap);
+
+ freq |= (cap >> 8) & 0xf0;
+ chan = (cap >> 8) & 0x0c;
+ bitrate = (cap << 16) & 0x7f0000;
+ vbr = cap & 0x0080;
+
+ l2cap_frame_get_be16(frame, &cap);
+
+ bitrate |= cap;
+
+ print_field("%*cObject Type: %s (0x%02x)", BASE_INDENT, ' ',
+ find_value_bit(type, aac_object_type_table), type);
+
+ print_field("%*cFrequency: %s (0x%02x)", BASE_INDENT, ' ',
+ find_value_bit(freq, aac_frequency_table), freq);
+
+ print_field("%*cChannels: %s (0x%02x)", BASE_INDENT, ' ',
+ find_value_bit(chan, aac_channels_table), chan);
+
+ print_field("%*cBitrate: %ubps", BASE_INDENT, ' ', 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) {
@@ -345,6 +465,8 @@ bool a2dp_codec_cap(uint8_t codec, uint8_t losc, struct l2cap_frame *frame)
return codec_sbc_cap(losc, frame);
case A2DP_CODEC_MPEG12:
return codec_mpeg12_cap(losc, frame);
+ case A2DP_CODEC_MPEG24:
+ return codec_aac_cap(losc, frame);
default:
packet_hexdump(frame->data, losc);
l2cap_frame_pull(frame, frame, losc);
@@ -359,6 +481,8 @@ bool a2dp_codec_cfg(uint8_t codec, uint8_t losc, struct l2cap_frame *frame)
return codec_sbc_cfg(losc, frame);
case A2DP_CODEC_MPEG12:
return codec_mpeg12_cfg(losc, frame);
+ case A2DP_CODEC_MPEG24:
+ return codec_aac_cfg(losc, frame);
default:
packet_hexdump(frame->data, losc);
l2cap_frame_pull(frame, frame, losc);
--
2.6.2
--
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