opus - May 2013 - Moving from Speex to Opus (question 2)

Hello!

I was using Speex all the time, and I am now moving to Opus.

I had encapsulated the decoder a bit, I had the following cpp file:

#include "StdAfx.h"
#include "spxcodec.h"

#define MAX_FRAME_SIZE 2000
#define MAX_FRAME_BYTES 2000

CSpxCodec::CSpxCodec() : enh(1), rate(8000)
{
}


CSpxCodec::~CSpxCodec()
{
}

void CSpxCodec::Init()
{
     speex_bits_init(&bits);
     decstate = speex_decoder_init(&speex_nb_mode);

     speex_decoder_ctl(decstate, SPEEX_SET_SAMPLING_RATE, &rate);
     speex_decoder_ctl(decstate, SPEEX_SET_ENH, &enh);

     int iFrameSize=0;
     speex_decoder_ctl(decstate, SPEEX_GET_FRAME_SIZE, &iFrameSize);

}

void CSpxCodec::Free()
{
     speex_bits_destroy(&bits);
     speex_decoder_destroy(decstate);
}

void CSpxCodec::Decode(unsigned char* inbuf, short* outbuf, unsigned int 
len)
{

     char cbits[MAX_FRAME_BYTES];
     float output[MAX_FRAME_SIZE];

     unsigned int i=0;
     unsigned int j=0;

     for (i=0; i<(len/62); i++)
     {

         for (j=0;j<62;j++)
         {
             cbits[j] = inbuf[(i*62)+j];
         }

         speex_bits_read_from(&bits, cbits, 62);
         speex_decode(decstate, &bits, output);

         for (j=0;j<160;j++)
         {
             outbuf[j+(i*160)] = output[j];
         }
     }
}
-------------------
I would like to ask if I can keep this "wrapper".
Please anybody tell me that I can just replace the word "speex" with 
"opus", and it will work, hehehehehe!
Can I keep the 62, 160 part, or will that be different in Opus?
I am not asking because I am lazy, I am just scared because Opus look so 
much different than Speex, and there is no "encoding/decoding for 
dummies" example as there was in Speex.
Could anybody perhaps give me another push in the right direction and 
tell me how a good starting point for Opus newbies?

Thank you so much.

Greetings,
Hermie

Look at the examples in the API doc. The Opus API is different from
Speex, bit it's still pretty simple (probably even simpler than Speex).

	Jean-Marc

On 09/05/13 02:30 PM, Hermann Weber wrote:
> Hello!
> 
> I was using Speex all the time, and I am now moving to Opus.
> 
> I had encapsulated the decoder a bit, I had the following cpp file:
> 
> #include "StdAfx.h"
> #include "spxcodec.h"
> 
> #define MAX_FRAME_SIZE 2000
> #define MAX_FRAME_BYTES 2000
> 
> CSpxCodec::CSpxCodec() : enh(1), rate(8000)
> {
> }
> 
> 
> CSpxCodec::~CSpxCodec()
> {
> }
> 
> void CSpxCodec::Init()
> {
>      speex_bits_init(&bits);
>      decstate = speex_decoder_init(&speex_nb_mode);
> 
>      speex_decoder_ctl(decstate, SPEEX_SET_SAMPLING_RATE, &rate);
>      speex_decoder_ctl(decstate, SPEEX_SET_ENH, &enh);
> 
>      int iFrameSize=0;
>      speex_decoder_ctl(decstate, SPEEX_GET_FRAME_SIZE, &iFrameSize);
> 
> }
> 
> void CSpxCodec::Free()
> {
>      speex_bits_destroy(&bits);
>      speex_decoder_destroy(decstate);
> }
> 
> void CSpxCodec::Decode(unsigned char* inbuf, short* outbuf, unsigned int 
> len)
> {
> 
>      char cbits[MAX_FRAME_BYTES];
>      float output[MAX_FRAME_SIZE];
> 
>      unsigned int i=0;
>      unsigned int j=0;
> 
>      for (i=0; i<(len/62); i++)
>      {
> 
>          for (j=0;j<62;j++)
>          {
>              cbits[j] = inbuf[(i*62)+j];
>          }
> 
>          speex_bits_read_from(&bits, cbits, 62);
>          speex_decode(decstate, &bits, output);
> 
>          for (j=0;j<160;j++)
>          {
>              outbuf[j+(i*160)] = output[j];
>          }
>      }
> }
> -------------------
> I would like to ask if I can keep this "wrapper".
> Please anybody tell me that I can just replace the word "speex"
with
> "opus", and it will work, hehehehehe!
> Can I keep the 62, 160 part, or will that be different in Opus?
> I am not asking because I am lazy, I am just scared because Opus look so 
> much different than Speex, and there is no "encoding/decoding for 
> dummies" example as there was in Speex.
> Could anybody perhaps give me another push in the right direction and 
> tell me how a good starting point for Opus newbies?
> 
> Thank you so much.
> 
> Greetings,
> Hermie
> _______________________________________________
> opus mailing list
> opus at xiph.org
> http://lists.xiph.org/mailman/listinfo/opus
>