Portaudio + Opus encoding / decoding audio input - c++

Question

I'm working on a VOIP client using Portaudio and opus.
I read from the microphone in a frame
-encode each frame with Opus and put it in a list
-pop the first element from the list and decode it
-read it with portaudio
If i do the same thing without encoding my sound it works great. But when I use Opus my sound is bad, I can't understand the voice (which is bad for a voip client)
HandlerOpus::HandlerOpus(int sample_rate, int num_channels)
{
this->num_channels = num_channels;
this->enc = opus_encoder_create(sample_rate, num_channels, OPUS_APPLICATION_VOIP, &this->error);
this->dec = opus_decoder_create(sample_rate, num_channels, &this->error);
opus_int32 rate;
opus_encoder_ctl(enc, OPUS_GET_BANDWIDTH(&rate));
this->encoded_data_size = rate;
}
HandlerOpus::~HandlerOpus(void)
{
opus_encoder_destroy(this->enc);
opus_decoder_destroy(this->dec);
}
unsigned char *HandlerOpus::encodeFrame(const float *frame, int frame_size)
{
unsigned char *compressed_buffer;
int ret;
compressed_buffer = new (unsigned char[this->encoded_data_size]);
ret = opus_encode_float(this->enc, frame, frame_size, compressed_buffer, this->encoded_data_size);
return (compressed_buffer);
}
float *HandlerOpus::decodeFrame(const unsigned char *data, int frame_size)
{
int ret;
float *frame = new (float[frame_size * this->num_channels]);
opus_packet_get_nb_channels(data);
ret = opus_decode_float(this->dec, data, this->encoded_data_size, frame, frame_size, 0);
return (frame);
}
I can't change the library I have to use Opus.
The sample rate is 48000 and the frames per buffer is 480 and I tried in mono and stereo.
What am I doing wrong?

Answer 1

I solved the problem myself I changed the config : The sample rate to 24000 and the frames per buffer is still 480.

Answer 2

It's 6 years later, but I'm gonna post an answer for future googlers like me:
I had very similiar problem and fixed it by changing PortAudio sample type to paInt32 and switched from opus_decode_float to just opus_decode