---
monitor/a2dp.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 77 insertions(+)
diff --git a/monitor/a2dp.c b/monitor/a2dp.c
index b6b01ee..ab93097 100644
--- a/monitor/a2dp.c
+++ b/monitor/a2dp.c
@@ -47,6 +47,10 @@
#define A2DP_CODEC_ATRAC 0x04
#define A2DP_CODEC_VENDOR 0xff
+/* Vendor Specific A2DP Codecs */
+#define APTX_VENDOR_ID 0x0000004f
+#define APTX_CODEC_ID 0x0001
+
struct bit_desc {
uint8_t bit;
const char *str;
@@ -166,6 +170,20 @@ static const struct bit_desc aac_channels_table[] = {
{ }
};
+static const struct bit_desc aptx_frequency_table[] = {
+ { 7, "16000" },
+ { 6, "32000" },
+ { 5, "44100" },
+ { 4, "48000" },
+ { }
+};
+
+static const struct bit_desc aptx_channel_mode_table[] = {
+ { 0, "Mono" },
+ { 1, "Stereo" },
+ { }
+};
+
static void print_bit_table(uint8_t indent, uint32_t value,
const struct bit_desc *table)
{
@@ -177,6 +195,14 @@ static void print_bit_table(uint8_t indent, uint32_t value,
}
}
+static const char *vndcodec2str(uint32_t vendor_id, uint16_t codec_id)
+{
+ if (vendor_id == APTX_VENDOR_ID && codec_id == APTX_CODEC_ID)
+ return "aptX";
+
+ return "Unknown";
+}
+
static bool codec_sbc(uint8_t losc, struct l2cap_frame *frame)
{
uint8_t cap = 0;
@@ -306,6 +332,55 @@ static bool codec_aac(uint8_t losc, struct l2cap_frame *frame)
return true;
}
+static bool codec_vendor_aptx(uint8_t losc, struct l2cap_frame *frame)
+{
+ uint8_t cap = 0;
+
+ if (losc != 1)
+ return false;
+
+ l2cap_frame_get_u8(frame, &cap);
+
+ print_field("%*cFrequency: 0x%02x", BASE_INDENT + 2, ' ', cap & 0xf0);
+ print_bit_table(BASE_INDENT + 2, cap & 0xf0, aptx_frequency_table);
+
+ print_field("%*cChannel Mode: 0x%02x", BASE_INDENT + 2, ' ',
+ cap & 0x0f);
+ print_bit_table(BASE_INDENT + 2, cap & 0x0f, aptx_channel_mode_table);
+
+ return true;
+}
+
+static bool codec_vendor(uint8_t losc, struct l2cap_frame *frame)
+{
+ uint32_t vendor_id = 0;
+ uint16_t codec_id = 0;
+
+ if (losc < 6)
+ return false;
+
+ l2cap_frame_get_le32(frame, &vendor_id);
+ l2cap_frame_get_le16(frame, &codec_id);
+
+ losc -= 6;
+
+ print_field("%*cVendor ID: 0x%08x (%s)", BASE_INDENT, ' ', vendor_id,
+ bt_compidtostr(vendor_id));
+
+ print_field("%*cVendor Specific Codec ID: 0x%04x (%s)",
+ BASE_INDENT, ' ', codec_id,
+ vndcodec2str(vendor_id, codec_id));
+
+ if (vendor_id == APTX_VENDOR_ID && codec_id == APTX_CODEC_ID) {
+ codec_vendor_aptx(losc, frame);
+ } else {
+ packet_hexdump(frame->data, losc);
+ l2cap_frame_pull(frame, frame, losc);
+ }
+
+ return true;
+}
+
bool a2dp_codec_caps(uint8_t codec, uint8_t losc, struct l2cap_frame *frame)
{
switch (codec) {
@@ -315,6 +390,8 @@ bool a2dp_codec_caps(uint8_t codec, uint8_t losc, struct l2cap_frame *frame)
return codec_mpeg12(losc, frame);
case A2DP_CODEC_MPEG24:
return codec_aac(losc, frame);
+ case A2DP_CODEC_VENDOR:
+ return codec_vendor(losc, frame);
default:
packet_hexdump(frame->data, losc);
l2cap_frame_pull(frame, frame, losc);
--
2.6.2
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