On Thursday 09 August 2018 16:39:09 ValdikSS wrote: > 0xFF 0x000A 0x0103 — Unknown codec found on Bose QuietComfort QC35 II
"The CSR True Wireless Stereo v3 Codec ID for SBC."
> Value hex dump: 07 06 00 00 ff ff 02 35
From information which I have, info payload is just embedded AVDTP media
capability buffer.
07 - AVDTP_SERVICE_MEDIA_CODEC
06 - length
00 - AVDTP_MEDIA_TYPE_AUDIO
00 - A2DP_CODEC_SBC
ff - SBC_CHANNEL_MODE_JOINT_STEREO | SBC_CHANNEL_MODE_STEREO |
SBC_CHANNEL_MODE_DUAL_CHANNEL | SBC_CHANNEL_MODE_MONO |
SBC_SAMPLING_FREQ_48000 | SBC_SAMPLING_FREQ_44100 |
SBC_SAMPLING_FREQ_32000 | SBC_SAMPLING_FREQ_16000
ff - SBC_BLOCK_LENGTH_4 | SBC_BLOCK_LENGTH_8 |
SBC_BLOCK_LENGTH_12 | SBC_BLOCK_LENGTH_16 |
SBC_SUBBANDS_4 | SBC_SUBBANDS_8
SBC_ALLOCATION_SNR | SBC_ALLOCATION_LOUDNESS
02 - min bitpool
35 - max bitpool
So it matches SBC definition buffer as expected.
> 0xFF 0x000A 0x0104 — Unknown codec found on Bose QuietComfort QC35 II
"The CSR True Wireless Stereo v3 Codec ID for AAC."
> Value hex dump: 07 08 00 02 c0 ff 8c 84 e2 00
Again, it should be embedded AVDTP media capability buffer.
07 - AVDTP_SERVICE_MEDIA_CODEC
08 - length
00 - AVDTP_MEDIA_TYPE_AUDIO
02 - A2DP_CODEC_MPEG24
c0 - AAC_OBJECT_TYPE_MPEG2_AAC_LC | AAC_OBJECT_TYPE_MPEG4_AAC_LTP |
AAC_OBJECT_TYPE_MPEG4_AAC_SCA
ff 8c - frequences: all; channels: all
84 e2 00 - VBR; bitrate: 320000
So also MPEG2/4 AAC buffer is correct.
Moreover there also exist these codecs:
0xFF 0x000A 0x0105 - The CSR True Wireless Stereo v3 Codec ID for MP3.
0xFF 0x000A 0x0106 - The CSR True Wireless Stereo v3 Codec ID for AptX.
And again capability buffer should contain embedded AVDTP media
capability buffer for MPEG1 (with Layyer 3) and for aptX.
--
Pali Rohár
pali.ro...@gmail.com
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