[opus] Sample code for encoding / decoding a RAW file

[Hermann Weber]

Thanks, I got it now by heavily cleaning up the opus_demo.exe.



Am 15.05.2013 19:05, schrieb Edwin van den Oetelaar:
> Hello Hermann,
>
> Can you explain what you are looking for, or what your problem is?
> General API or something else?
>
> You know the API is documented here :
> http://www.opus-codec.org/docs/html_api-1.0.2/group__opus__encoder.html
>
> What you need to do is
> 1) create a encoder context
> OpusEncoder *enc = opus_encoder_create(sampling_rate, channels,
> application, &err);
> 2) set the parameters up right
> eg.
> opus_int32 signal_type = OPUS_SIGNAL_MUSIC;
> opus_encoder_ctl(enc, OPUS_SET_SIGNAL(signal_type));
>
> 3) call opus_encode() with the raw input sample buffer and length as
> parameters and you get back bytes in a buffer with a length as encoded
> data
> uint32_t len = opus_encode(sCelt->enc_state, //
>                                     inputBuffer, //
>                                     framesPerBuffer,
>                                     outpacket, //
>                                     PACKETSIZE);
>
> With this data you do your file stuff.
>
> Later you can read it back from a file and put it into opus_decode()
> 1) create a decoder context like
> 2) no parameters
> 3) read some stuff from file
> 4) decode it
> uint32_t use_fec = 0;
> int rv = opus_decode(sCelt->dec_state, (const uint8_t *) packet.data,
>                               packet.len, outputBuffer,
> framesPerBuffer, use_fec);
>
> 5) use the frames you got back from the decoder...
>
> Hope this helps somebody,
> Greetings
> Edwin van den Oetelaar
>
>
>
> On Wed, May 15, 2013 at 5:59 PM, Hermann Weber <hermie.weber at gmx.de> wrote:
>> Hello,
>>
>> my last try:
>>
>> Isn't it possible that somebody writes a simple sample code on how to
>> encode / decode a RAW file?
>> The opus_demo.exe is not suitable (neither for encoding nor for
>> decoding, but of course it is a good testing suite for somebody who
>> knows what he is doing).
>>
>> For Speex there was such a great example for encoding / decoding a RAW
>> file, but not for Opus.
>>
>> I also posted this work on some freelancer platforms, but nobody could /
>> want to do it.
>> So it is surely not as simple as it sounds.
>> On one freelancer platform I even found a request for just the same work.
>>
>> I know the Opus devs are busy, but just having a demo for such a
>> seemingly simple operation would be nice.
>>
>> Greetings,
>> Hermann
>> _______________________________________________
>> opus mailing list
>> opus at xiph.org
>> http://lists.xiph.org/mailman/listinfo/opus