[pulseaudio-discuss] Extra A2DP codecs support in bluetooth module

[Luiz Augusto von Dentz]

Hi Pali,

On Mon, Aug 6, 2018 at 11:03 AM, Pali Rohár <pali.rohar at gmail.com> wrote:
> On Sunday 05 August 2018 15:59:05 ValdikSS wrote:
>> On 30.07.2018 10:30, Pali Rohár wrote:
>> > On Monday 30 July 2018 10:24:10 ValdikSS wrote:
>> >>> ACL Data RX: Handle 256 flags 0x02 dlen 20               #109 [hci0] 5.421906
>> >>       Channel: 66 len 16 [PSM 25 mode 0] {chan 2}
>> >>       AVDTP: Get Capabilities (0x02) Response Accept (0x02) type 0x00 label 0 nosp 0
>> >>         Service Category: Media Transport (0x01)
>> >>         Service Category: Media Codec (0x07)
>> >>           Media Type: Audio (0x00)
>> >>           Media Codec: Non-A2DP (0xff)
>> >>             Vendor ID: Cambridge Silicon Radio (0x0000000a)
>> >>             Vendor Specific Codec ID: Unknown (0x0001)
>> >>         03 23                                            .#
>> >>
>> >>
>> >> Am I misunderstanding the latest item? Is it not a FastStream?
>> >
>> > Yes, 0x0000000a/0x0001 is FastStream. "03" means that it supports both
>> > sink and source, "2" means that it supports microphone source sampling
>> > frequency 16kHz and "3" means that that is supports music sink sampling
>> > frequency 48kHz and 41.1kHz.
>> >
>>
>> How did you understand that? Do you have a documentation?
>> I'm writing Wireshark protocol dissector and want to include FastStream too.
>
> Hi! Look at https://patchwork.freedesktop.org/patch/241444/ patch, into
> file a2dp-codecs.h. I put there a2dp_faststream_t and FASTSTREAM_*
> defines, so it should be enough for writing dissector.

It doesn't look like we have FastStream decoding support in btmon either:

https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/monitor/a2dp.c#n50

-- 
Luiz Augusto von Dentz