标签：tostring clock cee 优先级 cpp cas sign sig create
1、视频
std::unique_ptr<VideoEncoder> InternalEncoderFactory::CreateVideoEncoder(
const SdpVideoFormat& format) {
if (absl::EqualsIgnoreCase(format.name, cricket::kVp8CodecName))
return VP8Encoder::Create();
if (absl::EqualsIgnoreCase(format.name, cricket::kVp9CodecName))
return VP9Encoder::Create(cricket::VideoCodec(format));
if (absl::EqualsIgnoreCase(format.name, cricket::kH264CodecName))
return H264Encoder::Create(cricket::VideoCodec(format));
RTC_LOG(LS_ERROR) << "Trying to created encoder of unsupported format "
<< format.name;
return nullptr;
}
从上到下的优先级的形式设置
2 音频
WebRtcVoiceMediaChannel::SetRecvCodecs
WebRtcVoiceMediaChannel::SetSendCodecs
for (const AudioCodec& voice_codec : codecs) {
if (!(IsCodec(voice_codec, kCnCodecName) ||
IsCodec(voice_codec, kDtmfCodecName) ||
IsCodec(voice_codec, kRedCodecName))) {
webrtc::SdpAudioFormat format(voice_codec.name, voice_codec.clockrate,
voice_codec.channels, voice_codec.params);
voice_codec_info = engine()->encoder_factory_->QueryAudioEncoder(format);
if (!voice_codec_info) {
RTC_LOG(LS_WARNING) << "Unknown codec " << ToString(voice_codec);
continue;
}
这个里边 从codecs的列表里 从头到尾的优先级找到当前使用的codec。
而这个codecs的列表数据，是音频引擎在启动的时候，获取到的，代码如下：
void WebRtcVoiceEngine::Init() {
RTC_DCHECK(worker_thread_checker_.IsCurrent());
RTC_LOG(LS_INFO) << "WebRtcVoiceEngine::Init";
// TaskQueue expects to be created/destroyed on the same thread.
low_priority_worker_queue_.reset(
new rtc::TaskQueue(task_queue_factory_->CreateTaskQueue(
"rtc-low-prio", webrtc::TaskQueueFactory::Priority::LOW)));
// Load our audio codec lists.
RTC_LOG(LS_VERBOSE) << "Supported send codecs in order of preference:";
send_codecs_ = CollectCodecs(encoder_factory_->GetSupportedEncoders());
for (const AudioCodec& codec : send_codecs_) {
RTC_LOG(LS_VERBOSE) << ToString(codec);
}
RTC_LOG(LS_VERBOSE) << "Supported recv codecs in order of preference:";
recv_codecs_ = CollectCodecs(decoder_factory_->GetSupportedDecoders());
for (const AudioCodec& codec : recv_codecs_) {
RTC_LOG(LS_VERBOSE) << ToString(codec);
}
标签：tostring clock cee 优先级 cpp cas sign sig create
原文地址：https://www.cnblogs.com/132818Creator/p/12942279.html
