WebRTC录音【转】

来源：互联网发布：国家要打仗了知乎编辑：程序博客网时间：2024/06/04 18:02

录音流程：AudioDeviceLinuxPulse::RecThreadProcess()负责采集音频数据，传递到AudioDeviceBuffer中缓存，AudioDeviceBuffer则将数据送入TransmixMixer，首先交给AudioProcess进行近端音频处理，完成后分发到各个Channel中，Channel则通过AudioCodingModule进行编码，编码后再交付到RtpRtcp中经由RTPSender发送出去。

AudioDeviceLinuxPulse::RecThreadProcessAudioDeviceLinuxPulse::ProcessRecordedDataAudioDeviceLinuxPulse::ReadRecordedData // Provide data to VoiceEngine        if (ProcessRecordedData(_recBuffer, numRecSamples, recDelay) == -1)        {            // We have stopped recording            return -1;        } AudioDeviceBuffer::DeliverRecordedDataVoEBaseImpl::RecordedDataIsAvailableVoEBaseImpl::ProcessRecordedDataWithAPMVoEBaseImpl::ProcessRecordedDataWithAPMTransmitMixer::PrepareDemuxTransmitMixer::GenerateAudioFrameVoEBaseImpl::ProcessRecordedDataWithAPMTransmitMixer::DemuxAndMixChannel::DemultiplexChannel::PrepareEncodeAndSendTransmitMixer::EncodeAndSendChannel::EncodeAndSend{...   // The ACM resamples internally.    _audioFrame.timestamp_ = _timeStamp;    if (audio_coding_->Add10MsData((AudioFrame&)_audioFrame) != 0)    {        WEBRTC_TRACE(kTraceError, kTraceVoice, VoEId(_instanceId,_channelId),                     "Channel::EncodeAndSend() ACM encoding failed");        return -1;    }    return audio_coding_->Process();...}AudioCodingModuleImpl::Add10MsData AudioCodingModuleImpl::PreprocessToAddDataACMGenericCodec::Add10MsDataReason: ACMGenericCodec* codecs_[ACMCodecDB::kMaxNumCodecs]  if (codecs_[current_send_codec_idx_]->Add10MsData(      ptr_frame->timestamp_, ptr_audio, ptr_frame->samples_per_channel_,      send_codec_inst_.channels) < 0)    return -1;int32_t ACMGenericCodec::Add10MsData(const uint32_t timestamp,                                     const int16_t* data,                                     const uint16_t length_smpl,                                     const uint8_t audio_channel) {  WriteLockScoped wl(codec_wrapper_lock_);  return Add10MsDataSafe(timestamp, data, length_smpl, audio_channel);}ACMGenericCodec::Add10MsDataSafeaudio_coding_->Process();AudioCodingModuleImpl::Process()AudioCodingModuleImpl::ProcessSingleStream(){...    status = codecs_[current_send_codec_idx_]->Encode(stream, &length_bytes,                                                      &rtp_timestamp,                                                      &encoding_type);...}ACMGenericCodec::Encode  AudioCodingModuleImpl::ProcessSingleStream        Channel::SendDataModuleRtpRtcpImpl::SendOutgoingDataRTPSender::SendOutgoingDataRTPSender::BuildRTPheaderRTPSender::SendToNetworkChannel::SendPacketBaseChannel::SendPacketP2PTransportChannel::SendPacketAsyncUDPSocket::SendToPhysicalSocket: Sendto

来自：http://blog.csdn.net/u014338577/article/details/45825381

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