[PATCH] btmon: Parse information about A2DP codecs: FastStream, aptX Low Latency and aptX HD

[Pali Rohár <pali.rohar@xxxxxxxxx>]

---
 monitor/a2dp.c | 230 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 230 insertions(+)

diff --git a/monitor/a2dp.c b/monitor/a2dp.c
index 6a271217b..6e82500d4 100644
--- a/monitor/a2dp.c
+++ b/monitor/a2dp.c
@@ -3,6 +3,7 @@
  *  BlueZ - Bluetooth protocol stack for Linux
  *
  *  Copyright (C) 2015  Andrzej Kaczmarek <andrzej.kaczmarek@xxxxxxxxxxx>
+ *  Copyright (C) 2018  Pali Rohár <pali.rohar@xxxxxxxxx>
  *
  *
  *  This library is free software; you can redistribute it and/or
@@ -51,6 +52,12 @@
 /* Vendor Specific A2DP Codecs */
 #define APTX_VENDOR_ID		0x0000004f
 #define APTX_CODEC_ID		0x0001
+#define FASTSTREAM_VENDOR_ID	0x0000000a
+#define FASTSTREAM_CODEC_ID	0x0001
+#define APTX_LL_VENDOR_ID	0x0000000a
+#define APTX_LL_CODEC_ID	0x0002
+#define APTX_HD_VENDOR_ID	0x000000D7
+#define APTX_HD_CODEC_ID	0x0024
 #define LDAC_VENDOR_ID		0x0000012d
 #define LDAC_CODEC_ID		0x00aa
 
@@ -187,6 +194,23 @@ static const struct bit_desc aptx_channel_mode_table[] = {
 	{ }
 };
 
+static const struct bit_desc faststream_direction_table[] = {
+	{  0, "Sink" },
+	{  1, "Source" },
+	{ }
+};
+
+static const struct bit_desc faststream_sink_frequency_table[] = {
+	{  1, "44100" },
+	{  0, "48000" },
+	{ }
+};
+
+static const struct bit_desc faststream_source_frequency_table[] = {
+	{  5, "16000" },
+	{ }
+};
+
 static void print_value_bits(uint8_t indent, uint32_t value,
 						const struct bit_desc *table)
 {
@@ -215,6 +239,12 @@ 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";
+	else if (vendor_id == FASTSTREAM_VENDOR_ID && codec_id == FASTSTREAM_CODEC_ID)
+		return "FastStream";
+	else if (vendor_id == APTX_LL_VENDOR_ID && codec_id == APTX_LL_CODEC_ID)
+		return "aptX Low Latency";
+	else if (vendor_id == APTX_HD_VENDOR_ID && codec_id == APTX_HD_CODEC_ID)
+		return "aptX HD";
 	else if (vendor_id == LDAC_VENDOR_ID && codec_id == LDAC_CODEC_ID)
 		return "LDAC";
 
@@ -508,6 +538,98 @@ static bool codec_vendor_aptx_cap(uint8_t losc, struct l2cap_frame *frame)
 	return true;
 }
 
+static bool codec_vendor_faststream_cap(uint8_t losc, struct l2cap_frame *frame)
+{
+	uint8_t cap = 0;
+
+	if (losc != 2)
+		return false;
+
+	l2cap_frame_get_u8(frame, &cap);
+
+	print_field("%*cDirection: 0x%02x", BASE_INDENT + 2, ' ', cap);
+	print_value_bits(BASE_INDENT + 2, cap, faststream_direction_table);
+
+	l2cap_frame_get_u8(frame, &cap);
+
+	print_field("%*cSink Frequency: 0x%02x", BASE_INDENT + 2, ' ', cap & 0x0f);
+	print_value_bits(BASE_INDENT + 2, cap & 0x0f, faststream_sink_frequency_table);
+
+	print_field("%*cSource Frequency: 0x%02x", BASE_INDENT + 2, ' ', cap & 0xf0);
+	print_value_bits(BASE_INDENT + 2, cap & 0xf0, faststream_source_frequency_table);
+
+	return true;
+}
+
+static bool codec_vendor_aptx_ll_cap(uint8_t losc, struct l2cap_frame *frame)
+{
+	uint8_t cap = 0;
+	uint16_t level = 0;
+
+	if (losc != 2 && losc != 11)
+		return false;
+
+	l2cap_frame_get_u8(frame, &cap);
+
+	print_field("%*cFrequency: 0x%02x", BASE_INDENT + 2, ' ', cap & 0xf0);
+	print_value_bits(BASE_INDENT + 2, cap & 0xf0, aptx_frequency_table);
+
+	print_field("%*cChannel Mode: 0x%02x", BASE_INDENT + 2, ' ',
+								cap & 0x0f);
+	print_value_bits(BASE_INDENT + 2, cap & 0x0f, aptx_channel_mode_table);
+
+	l2cap_frame_get_u8(frame, &cap);
+
+	print_field("%*cBidirectional link: %s", BASE_INDENT, ' ', (cap & 1) ? "Yes" : "No");
+
+	if ((cap & 2) && losc == 11) {
+		/* reserved */
+		l2cap_frame_get_u8(frame, &cap);
+
+		l2cap_frame_get_le16(frame, &level);
+		print_field("%*cTarget codec buffer level: %u (0x%02x)", BASE_INDENT + 2, ' ', level, level);
+
+		l2cap_frame_get_le16(frame, &level);
+		print_field("%*cInitial codec buffer level: %u (0x%02x)", BASE_INDENT + 2, ' ', level, level);
+
+		l2cap_frame_get_u8(frame, &cap);
+		print_field("%*cSRA max rate: %g (0x%02x)", BASE_INDENT + 2, ' ', cap / 10000.0, cap);
+
+		l2cap_frame_get_u8(frame, &cap);
+		print_field("%*cSRA averaging time: %us (0x%02x)", BASE_INDENT + 2, ' ', cap, cap);
+
+		l2cap_frame_get_le16(frame, &level);
+		print_field("%*cGood working codec buffer level: %u (0x%02x)", BASE_INDENT + 2, ' ', level, level);
+	}
+
+	return true;
+}
+
+static bool codec_vendor_aptx_hd_cap(uint8_t losc, struct l2cap_frame *frame)
+{
+	uint8_t cap = 0;
+
+	if (losc != 5)
+		return false;
+
+	l2cap_frame_get_u8(frame, &cap);
+
+	print_field("%*cFrequency: 0x%02x", BASE_INDENT + 2, ' ', cap & 0xf0);
+	print_value_bits(BASE_INDENT + 2, cap & 0xf0, aptx_frequency_table);
+
+	print_field("%*cChannel Mode: 0x%02x", BASE_INDENT + 2, ' ',
+								cap & 0x0f);
+	print_value_bits(BASE_INDENT + 2, cap & 0x0f, aptx_channel_mode_table);
+
+	/* reserved */
+	l2cap_frame_get_u8(frame, &cap);
+	l2cap_frame_get_u8(frame, &cap);
+	l2cap_frame_get_u8(frame, &cap);
+	l2cap_frame_get_u8(frame, &cap);
+
+	return true;
+}
+
 static bool codec_vendor_ldac(uint8_t losc, struct l2cap_frame *frame)
 {
 	uint16_t cap = 0;
@@ -543,6 +665,12 @@ static bool codec_vendor_cap(uint8_t losc, struct l2cap_frame *frame)
 
 	if (vendor_id == APTX_VENDOR_ID && codec_id == APTX_CODEC_ID)
 		return codec_vendor_aptx_cap(losc, frame);
+	else if (vendor_id == FASTSTREAM_VENDOR_ID && codec_id == FASTSTREAM_CODEC_ID)
+		return codec_vendor_faststream_cap(losc, frame);
+	else if (vendor_id == APTX_LL_VENDOR_ID && codec_id == APTX_LL_CODEC_ID)
+		return codec_vendor_aptx_ll_cap(losc, frame);
+	else if (vendor_id == APTX_HD_VENDOR_ID && codec_id == APTX_HD_CODEC_ID)
+		return codec_vendor_aptx_hd_cap(losc, frame);
 	else if (vendor_id == LDAC_VENDOR_ID && codec_id == LDAC_CODEC_ID)
 		return codec_vendor_ldac(losc, frame);
 
@@ -572,6 +700,102 @@ static bool codec_vendor_aptx_cfg(uint8_t losc, struct l2cap_frame *frame)
 	return true;
 }
 
+static bool codec_vendor_faststream_cfg(uint8_t losc, struct l2cap_frame *frame)
+{
+	uint8_t cap = 0;
+
+	if (losc != 2)
+		return false;
+
+	l2cap_frame_get_u8(frame, &cap);
+
+	print_field("%*cDirection: %s (0x%02x)", BASE_INDENT + 2, ' ',
+			find_value_bit(cap, faststream_direction_table),
+			cap);
+
+	l2cap_frame_get_u8(frame, &cap);
+
+	print_field("%*cSink Frequency: %s (0x%02x)", BASE_INDENT + 2, ' ',
+			find_value_bit(cap & 0x0f, faststream_sink_frequency_table),
+			cap & 0x0f);
+
+	print_field("%*cSource Frequency: %s (0x%02x)", BASE_INDENT + 2, ' ',
+			find_value_bit(cap & 0xf0, faststream_source_frequency_table),
+			cap & 0xf0);
+
+	return true;
+}
+
+static bool codec_vendor_aptx_ll_cfg(uint8_t losc, struct l2cap_frame *frame)
+{
+	uint8_t cap = 0;
+	uint16_t level = 0;
+
+	if (losc != 2 && losc != 11)
+		return false;
+
+	l2cap_frame_get_u8(frame, &cap);
+
+	print_field("%*cFrequency: %s (0x%02x)", BASE_INDENT + 2, ' ',
+			find_value_bit(cap & 0xf0, aptx_frequency_table),
+			cap & 0xf0);
+
+	print_field("%*cChannel Mode: %s (0x%02x)", BASE_INDENT + 2, ' ',
+			find_value_bit(cap & 0x0f, aptx_channel_mode_table),
+			cap & 0x0f);
+
+	l2cap_frame_get_u8(frame, &cap);
+
+	print_field("%*cBidirectional link: %s", BASE_INDENT, ' ', (cap & 1) ? "Yes" : "No");
+
+	if ((cap & 2) && losc == 11) {
+		l2cap_frame_get_u8(frame, &cap);
+
+		l2cap_frame_get_le16(frame, &level);
+		print_field("%*cTarget codec buffer level: %u (0x%02x)", BASE_INDENT + 2, ' ', level, level);
+
+		l2cap_frame_get_le16(frame, &level);
+		print_field("%*cInitial codec buffer level: %u (0x%02x)", BASE_INDENT + 2, ' ', level, level);
+
+		l2cap_frame_get_u8(frame, &cap);
+		print_field("%*cSRA max rate: %g (0x%02x)", BASE_INDENT + 2, ' ', cap / 10000.0, cap);
+
+		l2cap_frame_get_u8(frame, &cap);
+		print_field("%*cSRA averaging time: %us (0x%02x)", BASE_INDENT + 2, ' ', cap, cap);
+
+		l2cap_frame_get_le16(frame, &level);
+		print_field("%*cGood working codec buffer level: %u (0x%02x)", BASE_INDENT + 2, ' ', level, level);
+	}
+
+	return true;
+}
+
+static bool codec_vendor_aptx_hd_cfg(uint8_t losc, struct l2cap_frame *frame)
+{
+	uint8_t cap = 0;
+
+	if (losc != 5)
+		return false;
+
+	l2cap_frame_get_u8(frame, &cap);
+
+	print_field("%*cFrequency: %s (0x%02x)", BASE_INDENT + 2, ' ',
+			find_value_bit(cap & 0xf0, aptx_frequency_table),
+			cap & 0xf0);
+
+	print_field("%*cChannel Mode: %s (0x%02x)", BASE_INDENT + 2, ' ',
+			find_value_bit(cap & 0x0f, aptx_channel_mode_table),
+			cap & 0x0f);
+
+	/* reserved */
+	l2cap_frame_get_u8(frame, &cap);
+	l2cap_frame_get_u8(frame, &cap);
+	l2cap_frame_get_u8(frame, &cap);
+	l2cap_frame_get_u8(frame, &cap);
+
+	return true;
+}
+
 static bool codec_vendor_cfg(uint8_t losc, struct l2cap_frame *frame)
 {
 	uint32_t vendor_id = 0;
@@ -593,6 +817,12 @@ static bool codec_vendor_cfg(uint8_t losc, struct l2cap_frame *frame)
 
 	if (vendor_id == APTX_VENDOR_ID && codec_id == APTX_CODEC_ID)
 		return codec_vendor_aptx_cfg(losc, frame);
+	else if (vendor_id == FASTSTREAM_VENDOR_ID && codec_id == FASTSTREAM_CODEC_ID)
+		return codec_vendor_faststream_cfg(losc, frame);
+	else if (vendor_id == APTX_LL_VENDOR_ID && codec_id == APTX_LL_CODEC_ID)
+		return codec_vendor_aptx_ll_cfg(losc, frame);
+	else if (vendor_id == APTX_HD_VENDOR_ID && codec_id == APTX_HD_CODEC_ID)
+		return codec_vendor_aptx_hd_cfg(losc, frame);
 	else if (vendor_id == LDAC_VENDOR_ID && codec_id == LDAC_CODEC_ID)
 		return codec_vendor_ldac(losc, frame);
 
-- 
2.11.0