[FFmpeg-devel] [PATCH v2] avformat: add Software Defined Radio support

[James Almer]

On 6/22/2023 1:26 PM, Michael Niedermayer wrote:
> On Thu, Jun 22, 2023 at 12:10:06PM -0300, James Almer wrote:
>> On 6/22/2023 12:05 PM, Michael Niedermayer wrote:
>>> On Thu, Jun 22, 2023 at 10:55:44AM -0300, James Almer wrote:
>>>> On 6/22/2023 10:43 AM, Michael Niedermayer wrote:
>>>>> On Mon, Jun 19, 2023 at 12:28:05AM +0200, Michael Niedermayer wrote:
>>>>>> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
>>>>>> ---
>>>>>>     configure                |    4 +
>>>>>>     doc/demuxers.texi        |   71 ++
>>>>>>     libavformat/Makefile     |    2 +
>>>>>>     libavformat/allformats.c |    2 +
>>>>>>     libavformat/sdrdemux.c   | 1739 ++++++++++++++++++++++++++++++++++++++
>>>>>>     5 files changed, 1818 insertions(+)
>>>>>>     create mode 100644 libavformat/sdrdemux.c
>>>>>
>>>>> Ill post a v3 later today or tomorrow that makes this work with the RTL-SDR Blog V3
>>>>
>>>> Shouldn't the SDR "demuxer" be in libavdevice? Being AVFMT_NOFILE and pretty
>>>> much a capture device, it seems to me that's the proper place.
>>>> I guess the problem arises with the sdrfile demuxer, which shares code with
>>>> the other one.
>>>
>>> I have no oppinon on this. I can move it to libavdevice if people prefer.
>>> do people prefer libavdevice for this ?
>>
>> I do. It's a capture device and depends on an external library to interface
>> with hardware. And like i said, you can keep the file demuxer in lavf, where
>> it does fit.
> 
> anyone objects if i move sdrfile then too into libavdevice ? because its the
> same code basically. Otherwise it would have to be some sort of #include of c
> file accross libs

It does not belong in lavd. The doxy in avdevice.h states "the 
(de)muxers in libavdevice are of the AVFMT_NOFILE type". And you can 
make the common code avpriv_ since both libraries are basically version 
locked. There's no need to duplicate it, but if you prefer that, you can 
indeed do an #include c file using the SHLIBOBJS list in Makefile which 
will trigger on shared builds.

> 
> 
>>
>>>
>>>
>>> personally i think libavdevice should be merged with libavformat.
>>
>> It's been suggested plenty of times. Anton attempted to at least kickstart
>> it once, but his plan was shot down.
>> No one has tried anything ever since.
> 
> How was it shut down ?
> 1. sent patch
> 2. apply it
> I think it should be done with the next major ABI bump
> 
> thx
> 
> [...]
> 
> 
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