WebRTC录音【转】

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::RecThreadProcess AudioDeviceLinuxPulse::ProcessRecordedData AudioDeviceLinuxPulse::ReadRecordedData // Provide data to VoiceEngine if (ProcessRecordedData(_recBuffer, numRecSamples, recDelay) == -1) { // We have stopped recording return -1; } AudioDeviceBuffer::DeliverRecordedData VoEBaseImpl::RecordedDataIsAvailable VoEBaseImpl::ProcessRecordedDataWithAPM VoEBaseImpl::ProcessRecordedDataWithAPM TransmitMixer::PrepareDemux TransmitMixer::GenerateAudioFrame VoEBaseImpl::ProcessRecordedDataWithAPM TransmitMixer::DemuxAndMix Channel::Demultiplex Channel::PrepareEncodeAndSend TransmitMixer::EncodeAndSend Channel::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::PreprocessToAddData ACMGenericCodec::Add10MsData Reason: 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::Add10MsDataSafe audio_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::SendData ModuleRtpRtcpImpl::SendOutgoingData RTPSender::SendOutgoingData RTPSender::BuildRTPheader RTPSender::SendToNetwork Channel::SendPacket BaseChannel::SendPacket P2PTransportChannel::SendPacket AsyncUDPSocket::SendTo PhysicalSocket: Sendto来自： http://blog.csdn.net/u014338577/article/details/45825381