Ggtcf

I had a need to transmit sound over the network and for this I chose libraries "PortAudio" and "Opus". I am new to working with sound and therefore i don’t know many thing.I am new to working with sound and therefore i don’t know many things, but i read the documentation and looked at some examples, but i still have some problems with encoding/decoding with Opus. I do not understand how to correctly restore the original encoded PСM.I have some sequence of actions:
Some consts

const int FRAMES_PER_BUFFER = 960;
const int SAMPLE_RATE = 48000;
int NUM_CHANNELS = 2;
int totalFrames = 2 * SAMPLE_RATE; /* Record for a few seconds. */
int numSamples = totalFrames * 2;
int numBytes = numSamples * sizeof(float);
float *sampleBlock = nullptr;
int bytesOfPacket = 0;
unsigned char *packet = nullptr;

1. 
   

   I get PСM to sampleBlock

   
   
   

   paError = Pa_ReadStream(**&stream, sampleBlock, totalFrames);
   if (paError != paNoError) 
    cout << "PortAudio error : " << Pa_GetErrorText(paError) << endl;
    std::system("pause");
   
   

   
   


2. 
   

   Encoding sampleBlock

   
   
   

   OpusEncoder *encoder;
   int error;
   int size;
   encoder = opus_encoder_create(SAMPLE_RATE, NUM_CHANNELS, OPUS_APPLICATION_VOIP, &error);
   size = opus_encoder_get_size(NUM_CHANNELS);
   encoder = (OpusEncoder *)malloc(size);
   packet = new unsigned char[480];
   
   error = opus_encoder_init(encoder, SAMPLE_RATE, NUM_CHANNELS, OPUS_APPLICATION_VOIP);
   if (error == -1) 
    return -1;
   
   
   bytesOfPacket = opus_encode_float(encoder, sampleBlock, FRAMES_PER_BUFFER, packet, 480);
   opus_encoder_destroy(encoder);
   

   
   
   

   Ok, i received a encoded packet to Opus

   
   


3. 
   

   Decoding

   
   
   

   OpusDecoder *decoder;
   int error;
   int size;
   decoder = opus_decoder_create(SAMPLE_RATE, NUM_CHANNELS, &error);
   size = opus_decoder_get_size(NUM_CHANNELS);
   decoder = (OpusDecoder *)malloc(size);
   error = opus_decoder_init(decoder, SAMPLE_RATE, NUM_CHANNELS);
   
   opus_decode_float(decoder, packet, bytesOfPacket, sampleBlock, 480, 0);
   opus_decoder_destroy(decoder);
   

   
   
   

   Here i am trying to decode the Opus back to the PCM and save the result to the sampleBlock

   
   


4. 
   

   Playing the sound

   
   
   

   paError = Pa_WriteStream(**&stream, sampleBlock, totalFrames);
   if (paError != paNoError) 
    cout << "PortAudio error : " << Pa_GetErrorText(paError) << endl;
    std::system("pause");
   
   

   
   
   

   I get silence. I don't really understand the subtleties in working with sound since i am new to this business. Help please understand what is wrong.