stereo

[benbiles]

Hi , is there a way to enable stereo from line input ?

1st I tried this , but I still get mono.. \ AudioConnection patchCord1(i2s_in, 0, opusEncoder, 0); AudioConnection patchCord2(i2s_in, 1, opusEncoder, 1); AudioConnection patchCord3(opusDecoder, 0, i2s_out, 0); AudioConnection patchCord4(opusDecoder, 1, i2s_out, 1);

Then I tried 2 encoders but get helicopter glitches..

here's my attempt , I'm sure its much more simple than this ? I just doubled up the encoders decoders and made the copy twice.

// Demo code for Opus Encode/Decode for Teensy 4.0

include

include

include

if AUDIO_BLOCK_SAMPLES != 960

error Please define AUDIO_BLOCK_SAMPLES 960 and AUDIO_SAMPLE_RATE_EXACT 48000.0f (in AudioStream.h)

endif

include

include

AudioControlSGTL5000 sgtl5000_1;

AudioInputI2S i2s_in; AudioOutputI2S i2s_out;

AudioOutputOpusEnc opusEncoder; // Create Opus Encoder AudioInputOpusDec opusDecoder; // Create Opus Decoder

AudioOutputOpusEnc opusEncoder2; // Create Opus Encoder AudioInputOpusDec opusDecoder2; // Create Opus Decoder

AudioConnection patchCord1(i2s_in, 0, opusEncoder, 0); AudioConnection patchCord2(i2s_in, 1, opusEncoder2, 0);

AudioConnection patchCord3(opusDecoder, 0, i2s_out, 0); AudioConnection patchCord4(opusDecoder2, 0, i2s_out, 1);

void setup() {
AudioMemory(10); sgtl5000_1.enable();
sgtl5000_1.inputSelect(AUDIO_INPUT_LINEIN); sgtl5000_1.volume(0.8);

opusEncoder.initialise(); opusEncoder.setBitrate(64000); // Default is 64000 opusDecoder.initialise();

opusEncoder2.initialise(); opusEncoder2.setBitrate(64000); // Default is 64000 opusDecoder2.initialise();

}

void loop() {

// copy encoder LEFT channel to decoder

uint8_t *opusBuffer; int32_t opusBufSize;

opusBufSize = opusEncoder.hasData(); // Wait for a full block of Opus data

if(opusBufSize > 0) { opusBuffer = opusEncoder.getData(); // Write the encoded data to the buffer opusDecoder.putData(opusBuffer, opusBufSize); // Write the buffer to the decoder (loopback) }

// copy encoder RIGHT channel to decoder

uint8_t *opusBuffer2; int32_t opusBufSize2;

opusBufSize2 = opusEncoder2.hasData(); // Wait for a full block of Opus data

if(opusBufSize2 > 0) { opusBuffer2 = opusEncoder2.getData(); // Write the encoded data to the buffer opusDecoder2.putData(opusBuffer2, opusBufSize2); // Write the buffer to the decoder (loopback) }

} //END loop func

[benbiles]

there seams there's only support for one teensy audio channel in AudioOutputOpusEnc::update and AudioInputOpusDec::update

not sure what calls this function yet , new to teensy , I'm thinking I need to add channel support using receiveReadOnly(0); and receiveReadOnly(1);

`

void AudioOutputOpusEnc::update(void) { audio_block_t *block;

audio_block_t *block2;  // we need a 2nd block to recieve 2nd channel

block = receiveReadOnly(0); // pointer to audio chaanel 0

block2 = receiveReadOnly(1); // pointer to audio channel 1 ?

// opus encode audio channel 0

if (block) {
    if(encoderInitialised)
        {
        memcpy(encoder_frame_buf_uncompressed, block->data, CONFIG_AUDIO_FRAME_SIZE_SAMPLES * sizeof(int16_t));
        encoder_compressed_frame_size = opus_encode(m_opus_encoder_state, encoder_frame_buf_uncompressed, CONFIG_AUDIO_FRAME_SIZE_SAMPLES, encoder_frame_buf_compressed, sizeof(encoder_frame_buf_compressed));
        //Serial.printf(" %d", encoder_compressed_frame_size chaanel 0);
        }
    release(block);
}

// opus encode audio channel 1

    if (block2) {
    if(encoderInitialised)
        {
        memcpy(encoder_frame_buf_uncompressed, block2->data, CONFIG_AUDIO_FRAME_SIZE_SAMPLES * sizeof(int16_t));
        encoder_compressed_frame_size = opus_encode(m_opus_encoder_state, encoder_frame_buf_uncompressed, CONFIG_AUDIO_FRAME_SIZE_SAMPLES, encoder_frame_buf_compressed, sizeof(encoder_frame_buf_compressed));
        //Serial.printf(" %d", encoder_compressed_frame_size channel 1);
        }
    release(block2);
}

`