I use WebAssembly to implement the libopus encode method in the browser, encoding PCM audio data into Opus format frame by frame in real-time, and it works very well. However, when I set the same encoder parameters of libopus to AudioEncoder, the encoded Opus playback quality is very poor, with all noise and sharp sounds. I don’t know what went wrong. Can someone help solve this problem?
PCM audio data’s params is
- sampleRate：16kHz
- channels： 1
- bitrate：32000
- frameDuration：40ms
- depth：16
This’s use libopus encode code
// init encoder
opus_encoder_init(
this.#ptr,
16_000,
1,
'voip',
)
// encode part
// pcm arraybuffer data,byteLength=1280
const pcm = new Uint8Array(PCM buffer data)
opus_encode(
this.#ptr,
pcm,
640,
output,
4000,
)
// set encoder params
opus_ctl_params= {
vbr: false,
vbr_constraint: true,
// 1280bit*(1000/40ms)
bitrate: 32000,
complexity: 10,
signal: 'voice',
lsb_depth: 16,
dtx: false,
inband_fec: false,
}
This’s use webcodecs apis encode code
// init AudioEncoder
const encoder = new AudioEncoder({
error(e: any) {
console.error('AudioEncoder', e);
},
output: (chunk: EncodedAudioChunk) => {
const { byteLength } = chunk;
const data = new ArrayBuffer(byteLength);
chunk.copyTo(data);
}
)
// set AudioEncoder config
encoder.configure({
numberOfChannels: 1,
sampleRate: 16000,
codec: 'opus',
bitrate: 32000,
bitrateMode: 'constant',
opus: {
application: 'voip',
complexity: 10,
signal: 'voice',
// frame-size
frameDuration: 40000,
packetlossperc: 0,
usedtx: false,
useinbandfec: false,
},
})
// encode part
// pcm arraybuffer data,byteLength=1280
const data = new Int16Array(pcm );
const audioData = new AudioData({
format: 's16-planar',
sampleRate: 16000,
numberOfFrames: 640,
numberOfChannels: 1,
timestamp: (voiceDataIndex.value - 1) * 40 * 1000,
data: data,
});
encoder.encode(audioData);