diff options
| -rw-r--r-- | monitor/a2dp.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/monitor/a2dp.c b/monitor/a2dp.c index d053857c6..5c9553e28 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_num; 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_value_bits(uint8_t indent, uint32_t value, const struct bit_desc *table) { @@ -190,6 +208,14 @@ static const char *find_value_bit(uint32_t value, return "Unknown"; } +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_cap(uint8_t losc, struct l2cap_frame *frame) { uint8_t cap = 0; @@ -458,6 +484,103 @@ static bool codec_aac_cfg(uint8_t losc, struct l2cap_frame *frame) return true; } +static bool codec_vendor_aptx_cap(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_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); + + return true; +} + +static bool codec_vendor_cap(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: %s (0x%08x)", BASE_INDENT, ' ', + bt_compidtostr(vendor_id), vendor_id); + + print_field("%*cVendor Specific Codec ID: %s (0x%04x)", BASE_INDENT, + ' ', vndcodec2str(vendor_id, codec_id), codec_id); + + if (vendor_id == APTX_VENDOR_ID && codec_id == APTX_CODEC_ID) + return codec_vendor_aptx_cap(losc, frame); + + /* TODO: decode other codecs */ + packet_hexdump(frame->data, losc); + l2cap_frame_pull(frame, frame, losc); + + return true; +} + +static bool codec_vendor_aptx_cfg(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: %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); + + return true; +} + +static bool codec_vendor_cfg(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: %s (0x%08x)", BASE_INDENT, ' ', + bt_compidtostr(vendor_id), vendor_id); + + print_field("%*cVendor Specific Codec ID: %s (0x%04x)", BASE_INDENT, + ' ', vndcodec2str(vendor_id, codec_id), codec_id); + + if (vendor_id == APTX_VENDOR_ID && codec_id == APTX_CODEC_ID) + return codec_vendor_aptx_cfg(losc, frame); + + /* TODO: decode other codecs */ + packet_hexdump(frame->data, losc); + l2cap_frame_pull(frame, frame, losc); + + return true; +} + bool a2dp_codec_cap(uint8_t codec, uint8_t losc, struct l2cap_frame *frame) { switch (codec) { @@ -467,6 +590,8 @@ bool a2dp_codec_cap(uint8_t codec, uint8_t losc, struct l2cap_frame *frame) return codec_mpeg12_cap(losc, frame); case A2DP_CODEC_MPEG24: return codec_aac_cap(losc, frame); + case A2DP_CODEC_VENDOR: + return codec_vendor_cap(losc, frame); default: packet_hexdump(frame->data, losc); l2cap_frame_pull(frame, frame, losc); @@ -483,6 +608,8 @@ bool a2dp_codec_cfg(uint8_t codec, uint8_t losc, struct l2cap_frame *frame) return codec_mpeg12_cfg(losc, frame); case A2DP_CODEC_MPEG24: return codec_aac_cfg(losc, frame); + case A2DP_CODEC_VENDOR: + return codec_vendor_cfg(losc, frame); default: packet_hexdump(frame->data, losc); l2cap_frame_pull(frame, frame, losc); |