obs之libfaac编码

obs源码之libaac编码。

#include "Main.h"#include "../libfaac/include/faac.h"//AAC is pretty good, I changed my  mind
class AACEncoder : public AudioEncoder
{UINT curBitRate;bool bFirstPacket;faacEncHandle faac;DWORD numReadSamples;DWORD outputSize;List<float> inputBuffer;List<BYTE>  aacBuffer;List<BYTE>  header;List<DWORD> bufferedTimestamps;DWORD curEncodeTimestamp;bool bFirstFrame;public:AACEncoder(UINT bitRate){curBitRate = bitRate;faac = faacEncOpen(44100, 2, &numReadSamples, &outputSize);//Log(TEXT("numReadSamples: %d"), numReadSamples);aacBuffer.SetSize(outputSize+2);aacBuffer[0] = 0xaf;aacBuffer[1] = 0x1;faacEncConfigurationPtr config = faacEncGetCurrentConfiguration(faac);config->bitRate = (bitRate*1000)/2;config->quantqual = 100;config->inputFormat = FAAC_INPUT_FLOAT;config->mpegVersion = MPEG4;config->aacObjectType = LOW;config->useLfe = 0;config->outputFormat = 0;int ret = faacEncSetConfiguration(faac, config);if(!ret)CrashError(TEXT("aac configuration failed"));BYTE *tempHeader;DWORD len;header.SetSize(2);header[0] = 0xaf;header[1] = 0x00;faacEncGetDecoderSpecificInfo(faac, &tempHeader, &len);header.AppendArray(tempHeader, len);free(tempHeader);bFirstPacket = true;bFirstFrame  = true;Log(TEXT("------------------------------------------"));Log(TEXT("%s"), GetInfoString().Array());}~AACEncoder(){faacEncClose(faac);}bool Encode(float *input, UINT numInputFrames, DataPacket &packet, DWORD ×tamp){if(bFirstFrame){curEncodeTimestamp = timestamp;bFirstFrame = false;}//------------------------------------------------DWORD curTimestamp = timestamp;UINT lastSampleSize = inputBuffer.Num();UINT numInputSamples = numInputFrames*2;inputBuffer.AppendArray(input, numInputSamples);int ret = 0;if(inputBuffer.Num() >= numReadSamples){//now we have to upscale the floats.  fortunately we almost always have SSEUINT floatsLeft  = numReadSamples;float *inputTemp = inputBuffer.Array();if(App->SSE2Available() && (UPARAM(inputTemp) & 0xF) == 0){UINT alignedFloats = floatsLeft & 0xFFFFFFFC;for(UINT i=0; i<alignedFloats; i += 4){float *pos = inputTemp+i;_mm_store_ps(pos, _mm_mul_ps(_mm_load_ps(pos), _mm_set_ps1(32767.0f)));}floatsLeft &= 0x3;inputTemp  += alignedFloats;}if(floatsLeft){for(UINT i=0; i<floatsLeft; i++)inputTemp[i] *= 32767.0f;}ret = faacEncEncode(faac, (int32_t*)inputBuffer.Array(), numReadSamples, aacBuffer.Array()+2, outputSize);if(ret > 0){if(bFirstPacket){bFirstPacket = false;ret = 0;}else{packet.lpPacket = aacBuffer.Array();packet.size     = ret+2;timestamp = bufferedTimestamps[0];bufferedTimestamps.Remove(0);}}else if(ret < 0)AppWarning(TEXT("aac encode error"));inputBuffer.RemoveRange(0, numReadSamples);bufferedTimestamps << curEncodeTimestamp;curEncodeTimestamp = curTimestamp + (((numReadSamples-lastSampleSize)/2)*10/441);}return ret > 0;}UINT GetFrameSize() const{return 1024;}void GetHeaders(DataPacket &packet){packet.lpPacket = header.Array();packet.size = header.Num();}int GetBitRate() const {return curBitRate;}CTSTR GetCodec() const {return TEXT("AAC");}String GetInfoString() const{String strInfo;strInfo << TEXT("Audio Encoding: AAC")  <<TEXT("\r\n    bitrate: ") << IntString(curBitRate);return strInfo;}
};AudioEncoder* CreateAACEncoder(UINT bitRate)
{return new AACEncoder(bitRate);
}

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