| 17 | } |
| 18 | |
| 19 | bool OpusAudioEncoder::Open(uint32_t sample_rate, uint32_t channels, std::string* error) { |
| 20 | Close(); |
| 21 | if (sample_rate != 48000 || channels == 0 || channels > 2) { |
| 22 | if (error) *error = "only 48kHz mono/stereo PCM is supported for Opus encoding"; |
| 23 | return false; |
| 24 | } |
| 25 | |
| 26 | int opus_error = OPUS_OK; |
| 27 | OpusEncoder* encoder = opus_encoder_create( |
| 28 | static_cast<opus_int32>(sample_rate), |
| 29 | static_cast<int>(channels), |
| 30 | OPUS_APPLICATION_RESTRICTED_LOWDELAY, |
| 31 | &opus_error); |
| 32 | if (!encoder || opus_error != OPUS_OK) { |
| 33 | if (error) *error = opus_strerror(opus_error); |
| 34 | if (encoder) opus_encoder_destroy(encoder); |
| 35 | return false; |
| 36 | } |
| 37 | |
| 38 | opus_encoder_ctl(encoder, OPUS_SET_BITRATE(64000)); |
| 39 | opus_encoder_ctl(encoder, OPUS_SET_VBR(1)); |
| 40 | opus_encoder_ctl(encoder, OPUS_SET_VBR_CONSTRAINT(0)); |
| 41 | opus_encoder_ctl(encoder, OPUS_SET_COMPLEXITY(5)); |
| 42 | opus_encoder_ctl(encoder, OPUS_SET_SIGNAL(OPUS_SIGNAL_MUSIC)); |
| 43 | opus_encoder_ctl(encoder, OPUS_SET_INBAND_FEC(0)); |
| 44 | opus_encoder_ctl(encoder, OPUS_SET_DTX(1)); |
| 45 | |
| 46 | impl_ = std::make_unique<Impl>(); |
| 47 | impl_->encoder = encoder; |
| 48 | impl_->sample_rate = sample_rate; |
| 49 | impl_->channels = channels; |
| 50 | encoded_.resize(4096); |
| 51 | return true; |
| 52 | } |
| 53 | |
| 54 | bool OpusAudioEncoder::Encode(const AudioChunk& chunk, EncodedAudioFrame* output, std::string* error) { |
| 55 | if (!impl_ || !impl_->encoder) { |
no outgoing calls
no test coverage detected