obs之lame编码

obs之lame编码。

#include "Main.h"#include "../lame/include/lame.h"const int audioBlockSize = 4; //output is 2 16bit channelsstruct AACDataPacket
{List<BYTE> Packet;inline void FreeData() {Packet.Clear();}
};//lame is not lame..  it's godly.
class MP3Encoder : public AudioEncoder
{lame_global_flags *lgf;List<BYTE> MP3OutputBuffer;List<BYTE> header;DWORD dwMP3MaxSize;bool bFirstPacket;UINT outputFrameSize;UINT curBitRate;List<DWORD> bufferedTimestamps;DWORD curEncodeTimestamp;DWORD frameCounter;bool bFirstFrame;public:MP3Encoder(UINT bitRate){curBitRate = bitRate;lgf = lame_init();if(!lgf)CrashError(TEXT("Unable to open mp3 encoder"));lame_set_in_samplerate(lgf, 44100);lame_set_out_samplerate(lgf, 44100);lame_set_num_channels(lgf, 2);lame_set_mode(lgf, STEREO);lame_set_disable_reservoir(lgf, TRUE); //bit reservoir has to be disabled for seamless streaminglame_set_VBR(lgf, vbr_off);lame_set_brate(lgf, bitRate);lame_init_params(lgf);outputFrameSize = lame_get_framesize(lgf); //1152 usuallydwMP3MaxSize = DWORD(1.25*double(outputFrameSize*audioBlockSize) + 7200.0);MP3OutputBuffer.SetSize(dwMP3MaxSize+1);MP3OutputBuffer[0] = 0x2f;bFirstPacket = true;Log(TEXT("------------------------------------------"));Log(TEXT("%s"), GetInfoString().Array());}~MP3Encoder(){lame_close(lgf);}bool Encode(float *input, UINT numInputFrames, DataPacket &packet, DWORD ×tamp){if(bFirstFrame){curEncodeTimestamp = timestamp;bFirstFrame = false;}//------------------------------------------------UINT lastSampleSize = frameCounter;frameCounter += numInputFrames;if(frameCounter > outputFrameSize){frameCounter -= outputFrameSize;bufferedTimestamps << curEncodeTimestamp;curEncodeTimestamp = timestamp + ((outputFrameSize-lastSampleSize)*10/441);}int framenum1 = lame_get_frameNum(lgf);int ret = lame_encode_buffer_interleaved_ieee_float(lgf, (float*)input, numInputFrames, MP3OutputBuffer.Array()+1, dwMP3MaxSize);int framesEncoded = lame_get_frameNum(lgf)-framenum1;if(ret < 0){AppWarning(TEXT("MP3 encode failed"));return false;}if(ret > 0){if(bFirstPacket){header.CopyArray(MP3OutputBuffer.Array(), ret);bFirstPacket = false;ret = 0;}else{packet.lpPacket = MP3OutputBuffer.Array();packet.size     = ret+1;timestamp = bufferedTimestamps[0];bufferedTimestamps.Remove(0);}}return ret > 0;}UINT GetFrameSize() const{return outputFrameSize;}void GetHeaders(DataPacket &packet){packet.lpPacket = header.Array();packet.size = header.Num();OSDebugOut(TEXT("testing, 123\r\n"));}int GetBitRate() const {return curBitRate;}CTSTR GetCodec() const {return TEXT("MP3");}String GetInfoString() const{String strInfo;strInfo << TEXT("Audio Encoding: MP3") <<TEXT("\r\n    bitrate: ") << IntString(curBitRate);return strInfo;}
};AudioEncoder* CreateMP3Encoder(UINT bitRate)
{return new MP3Encoder(bitRate);
}

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