[opus] [EXTERNAL] Re: Developing OPUS on TI CC3220

Rodriguez, Vince vince.rodriguez at ti.com
Fri Feb 23 15:47:38 UTC 2018

Thanks Jean-Marc,

I was able to get both encode and decode working the CC3220 device! But for bi-directional communication, I need decode and encode to occur in less time than the frame size I’m sending (20 ms).

Currently decode takes 16~22 ms and encode is ~13 ms. What is the best way to try to reduce this time? Also, unsure why encode is taking less time than decode...

I've also noticed if I change my encoder to silk only, I get a Heap overflow... I have dynamically allocated a heap for the codec, got the size using the api and used encode init so that the memory is allocated to my created heap. I have 30k currently in heap, since the return of get  size was ~25 kB. This seems to happen when I change the application as well. :/

Currently here is how I am setting up my encoder:

    int size = opus_encoder_get_size(1);

    sOpusEnc = Memory_alloc(OpusHeap,size,NULL,NULL);


//    sOpusEnc = opus_encoder_create(16000,

//                                   1,

//                                   OPUS_APPLICATION_VOIP, &i32error);

    i32error = opus_encoder_init(sOpusEnc, 16000, 1, OPUS_APPLICATION_RESTRICTED_LOWDELAY);

    opus_encoder_ctl(sOpusEnc, OPUS_SET_BITRATE(16000));

    opus_encoder_ctl(sOpusEnc, OPUS_SET_VBR(1));

    opus_encoder_ctl(sOpusEnc, OPUS_SET_VBR_CONSTRAINT(0));

    opus_encoder_ctl(sOpusEnc, OPUS_SET_COMPLEXITY(0));

    opus_encoder_ctl(sOpusEnc, OPUS_SET_INBAND_FEC(0));

    opus_encoder_ctl(sOpusEnc, OPUS_SET_FORCE_CHANNELS(1));//Mono

    opus_encoder_ctl(sOpusEnc, OPUS_SET_PACKET_LOSS_PERC(0));

    opus_encoder_ctl(sOpusEnc, OPUS_SET_LSB_DEPTH(16)




    opus_encoder_ctl(sOpusEnc, OPUS_SET_FORCE_MODE(MODE_CELT_ONLY));

Thanks again for your help!


-----Original Message-----
From: Jean-Marc Valin [mailto:jmvalin at jmvalin.ca]
Sent: Tuesday, February 20, 2018 6:23 PM
To: Rodriguez, Vince; opus at xiph.org
Subject: Re: [EXTERNAL] Re: [opus] Developing OPUS on TI CC3220

On 02/20/2018 06:48 PM, Rodriguez, Vince wrote:

> I am trying to get the library to build without using the pseudostack

> define, and use either VAR_ARRAYS or ALLOC, but it seems the global

> stack is not defined.

Not sure what you mean here. If your compiler supports C99 VLAs, then by all means just define VAR_ARRAYS and you're good to go. If not, the second best option is alloca(), which you can use by defining USE_ALLOCA. If your compiler supports alloca() and USE_ALLOCA doesn't work, then you may need to make minor tweaks to celt/stack_alloc.h. Do not use NONTHREADSAFE_PSEUDOSTACK unless all other options fail.



> -----Original Message----- From: Jean-Marc Valin

> [mailto:jmvalin at jmvalin.ca] Sent: Tuesday, February 20, 2018 5:40 PM

> To: Rodriguez, Vince; opus at xiph.org<mailto:opus at xiph.org> Subject: [EXTERNAL] Re: [opus]

> Developing OPUS on TI CC3220


> Hi Vince,


> Normally, Opus should work fine on the CC3220, though real-time

> encoding may be a bit tight depending on what configuration you

> choose. You'll probably want to configure with --enable-fixed-point

> and --disable-float-api (or define FIXED_POINT and DISABLE_FLOAT_API

> if you don't use autoconf).


> The encoder has a bunch of run-time settings that you may want to set,

> depending on your application. These include bitrate, complexity

> (probably a low setting for that that chip), and bitrate management



> In the end, aside from the complexity requirements, you should need to

> do anything special to get Opus running on your chip.


> Cheers,


> Jean-Marc


> On 02/20/2018 05:46 PM, Rodriguez, Vince wrote:

>> I'm looking to try to port a Opus Decoder and Encoder onto the TI

>> CC3220SF (http://www.ti.com/product/CC3220) device. Currently, I have

>> successfully been able to get the decode working for a .ogg file

>> saved locally to the serial flash. My end goal is bidirectional audio

>> using OPUS between two devices. While looking into the documentation

>> for the Encoder, I was not sure what the best step forward would be

>> in trying to enable this streaming application.




>> Can someone give me a little guidance on how to properly setup the

>> encoder for streaming applications, and if I need to do anything

>> special to ensure the encoder works correctly on an ARM M4 (not

>> Floating point) MCU?




>> Thanks!




>> *Vince Rodriguez*








>> _______________________________________________ opus mailing list

>> opus at xiph.org<mailto:opus at xiph.org> http://lists.xiph.org/mailman/listinfo/opus

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