1、接口函數：兩個接口函數的區別還是傳入的是文件名還是流。
參數 還包括使用的編碼格式。
int StartRecordingMicrophone(const char* fileNameUTF8,
CodecInst* compression = NULL,
int maxSizeBytes = -1) override;
int StartRecordingMicrophone(OutStream* stream,
CodecInst* compression = NULL) override;
2、調用transmit_mixer 類進行錄音操作。
int VoEFileImpl::StartRecordingMicrophone(const char* fileNameUTF8,
CodecInst* compression,
int maxSizeBytes) {
WEBRTC_TRACE(kTraceApiCall, kTraceVoice, VoEId(_shared->instance_id(), -1),
"StartRecordingMicrophone(fileNameUTF8=%s, compression, "
"maxSizeBytes=%d)",
fileNameUTF8, maxSizeBytes);
static_assert(1024 == FileWrapper::kMaxFileNameSize, "");
if (!_shared->statistics().Initialized()) {
_shared->SetLastError(VE_NOT_INITED, kTraceError);
return -1;
}
if (_shared->transmit_mixer()->StartRecordingMicrophone(fileNameUTF8,
compression)) {
WEBRTC_TRACE(kTraceError, kTraceVoice, VoEId(_shared->instance_id(), -1),
"StartRecordingMicrophone() failed to start recording");
return -1;
}
if (!_shared->audio_device()->Recording()) {
if (_shared->audio_device()->InitRecording() != 0) {
WEBRTC_TRACE(kTraceError, kTraceVoice, VoEId(_shared->instance_id(), -1),
"StartRecordingMicrophone() failed to initialize recording");
return -1;
}
if (_shared->audio_device()->StartRecording() != 0) {
WEBRTC_TRACE(kTraceError, kTraceVoice, VoEId(_shared->instance_id(), -1),
"StartRecordingMicrophone() failed to start recording");
return -1;
}
}
return 0;
}
3、transimit_mixer 創建fileplayer 進行文件編碼
int TransmitMixer::StartRecordingMicrophone(OutStream* stream,
const CodecInst* codecInst)
{
WEBRTC_TRACE(kTraceInfo, kTraceVoice, VoEId(_instanceId, -1),
"TransmitMixer::StartRecordingMicrophone()");
rtc::CritScope cs(&_critSect);
if (_fileRecording)
{
WEBRTC_TRACE(kTraceWarning, kTraceVoice, VoEId(_instanceId, -1),
"StartRecordingMicrophone() is already recording");
return 0;
}
FileFormats format;
const uint32_t notificationTime(0); // Not supported in VoE
CodecInst dummyCodec = { 100, "L16", 16000, 320, 1, 320000 };
if (codecInst != NULL && codecInst->channels != 1)
{
_engineStatisticsPtr->SetLastError(
VE_BAD_ARGUMENT, kTraceError,
"StartRecordingMicrophone() invalid compression");
return (-1);
}
if (codecInst == NULL)
{
format = kFileFormatPcm16kHzFile;
codecInst = &dummyCodec;
} else if ((STR_CASE_CMP(codecInst->plname,"L16") == 0) ||
(STR_CASE_CMP(codecInst->plname,"PCMU") == 0) ||
(STR_CASE_CMP(codecInst->plname,"PCMA") == 0))
{
format = kFileFormatWavFile;
} else
{
format = kFileFormatCompressedFile;
}
// Destroy the old instance
if (file_recorder_) {
file_recorder_->RegisterModuleFileCallback(NULL);
file_recorder_.reset();
}
file_recorder_ = FileRecorder::CreateFileRecorder(
_fileRecorderId, (const FileFormats)format);
if (!file_recorder_) {
_engineStatisticsPtr->SetLastError(
VE_INVALID_ARGUMENT, kTraceError,
"StartRecordingMicrophone() fileRecorder format isnot correct");
return -1;
}
if (file_recorder_->StartRecordingAudioFile(stream, *codecInst,
notificationTime) != 0) {
_engineStatisticsPtr->SetLastError(
VE_BAD_FILE, kTraceError,
"StartRecordingAudioFile() failed to start file recording");
file_recorder_->StopRecording();
file_recorder_.reset();
return -1;
}
file_recorder_->RegisterModuleFileCallback(this);
_fileRecording = true;
return 0;
}
4、在準備分發到遠端時 錄製文件
int32_t TransmitMixer::RecordAudioToFile(
uint32_t mixingFrequency)
{
rtc::CritScope cs(&_critSect);
if (!file_recorder_) {
WEBRTC_TRACE(kTraceWarning, kTraceVoice, VoEId(_instanceId, -1),
"TransmitMixer::RecordAudioToFile() filerecorder doesnot"
"exist");
return -1;
}
if (file_recorder_->RecordAudioToFile(_audioFrame) != 0) {
WEBRTC_TRACE(kTraceWarning, kTraceVoice, VoEId(_instanceId, -1),
"TransmitMixer::RecordAudioToFile() file recording"
"failed");
return -1;
}
return 0;
}