Newbie questions: osxaudiosink, USB DAC and integer mode

[novazeta]

Thanks for your help. I have another question:

The DAC requires 24bit integer audio. Is it better to have gstreamer do the
depth conversion from 16-bit to 24-bit or let CoreAudio do it?

Cheers
Khilan

On 4 August 2015 at 09:18, Sérgio Agostinho <sergio.r.agostinho at gmail.com>
wrote:

> Yes. You can run gst-launch with -v and that will print the capabilities
> negotiated in each pad, enabling you to check if you're passing audio to
> your DAC in the format you wanted.
>
> Cheers
>
> 2015-08-03 19:10 GMT+02:00 novazeta <novazeta at gmail.com>:
>
>> Ok so it turns out that I have to stick with gstreamer 0.10, as that is
>> the version that Mopidy supports. However, I have updated to the tip of the
>> 0.10 branch. Is this the correct way to use capsfilter (using the shorthand
>> here)?
>>
>> gst-launch-0.10 audiotestsrc ! audio/x-raw-int,width=16,depth=16 !
>> osxaudiosink
>>
>> As a reminder, these are the capabilities of osxaudiosink in the version
>> that is at the tip of the 0.10 branch of gst-plugins-good:
>>
>>     Capabilities:
>>       audio/x-raw-float
>>              endianness: { 1234 }
>>                  signed: { true }
>>                   width: 32
>>                   depth: 32
>>                    rate: [ 1, 2147483647 ]
>>                channels: [ 1, 9 ]
>>       audio/x-raw-int
>>              endianness: { 1234 }
>>                  signed: { true }
>>                   width: 32
>>                   depth: 32
>>                    rate: [ 1, 2147483647 ]
>>                channels: [ 1, 9 ]
>>       audio/x-raw-int
>>              endianness: { 1234 }
>>                  signed: { true }
>>                   width: 24
>>                   depth: 24
>>                    rate: [ 1, 2147483647 ]
>>                channels: [ 1, 9 ]
>>       audio/x-raw-int
>>              endianness: { 1234 }
>>                  signed: { true }
>>                   width: 16
>>                   depth: 16
>>                    rate: [ 1, 2147483647 ]
>>                channels: [ 1, 9 ]
>>       audio/x-raw-int
>>              endianness: { 1234 }
>>                  signed: { true }
>>                   width: 8
>>                   depth: 8
>>                    rate: [ 1, 2147483647 ]
>>                channels: [ 1, 2147483647 ]
>>       audio/x-ac3
>>                  framed: true
>>       audio/x-dts
>>                  framed: true
>>
>> Cheers
>> Khilan
>>
>>
>> On 3 August 2015 at 16:14, novazeta <novazeta at gmail.com> wrote:
>>
>>> Sorry, yes I meant the DAC.
>>>
>>> Thanks for the reference to capsfilter!
>>>
>>> Will check it out.
>>>
>>> Regards
>>> Khilan
>>>
>>> On 3 August 2015 at 15:59, Sérgio Agostinho <
>>> sergio.r.agostinho at gmail.com> wrote:
>>>
>>>>
>>>> 2015-08-03 16:19 GMT+02:00 novazeta <novazeta at gmail.com>:
>>>>
>>>>> So I would hope that osxaudiosink would handle the data as raw
>>>>> integers if the sink also expects integers?
>>>>
>>>>
>>>> I'm confused. Which other sink are you talking about? Are you referring
>>>> to your DAC?
>>>> If you need to ensure 24bit integer audio reaches osxaudiosink, there
>>>> are ways to do that. Look at capsfilter
>>>> <http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-plugins/html/gstreamer-plugins-capsfilter.html>
>>>> .
>>>>
>>>> Cheers
>>>>
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> gstreamer-devel at lists.freedesktop.org
>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
>>>>
>>>
>>
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>>
>
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