MP3DecodeDLL 解码库

/* This file is part of MP3DecodeDLL for Symbian. MP3DecodeDLL for Symbian Copyright (C) 2004 Denis Mingulov <denis@mingulov.com> MP3DecodeDLL for Symbian is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. MP3DecodeDLL for Symbian is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with MP3DecodeDLL for Symbian; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef MP3DECODE_H #define MP3DECODE_H #include <e32std.h> //#include "logfile.h" #include <f32file.h> //#include <charconv.h> #include "mad.h" //#include <mdaaudiooutputstream.h> //#include <mda\\common\\audio.h> //TMdaAudioDataSettings //#include <stdio.h> //#include <string.h> #define MAX_RESAMPLEFACTOR 6 #define MAX_NSAMPLES (1152 * MAX_RESAMPLEFACTOR) class CMP3Decode : CBase { struct resample_state { mad_fixed_t ratio; mad_fixed_t step; mad_fixed_t last; }; public: static CMP3Decode *NewL (); static CMP3Decode *NewLC (); virtual ~CMP3Decode(); TInt Open(RFs &aFileServer, const TDesC &aFileName); // opens the stream TInt Close(); TInt SetEqualizer (TInt aEq60, TInt aEq170, TInt aEq310, TInt aEq600, TInt aEq1K, TInt aEq3K, TInt aEq6K, TInt aEq12K, TInt aEq14K, TInt aEq16K, TInt aEqZero, TInt aEqDiv); TInt SetResampleRate(TInt aResampleRate); TInt DecodeOneFrame (TDes &aBuffer); TInt GetFileLength(); TInt GetFilePosition(); protected: TInt CloseMP3 (); TInt InitMP3 (); int DecodeOneFrameLow (); unsigned int resample_block(struct resample_state *state, unsigned int nsamples, mad_fixed_t const *old, TInt16 *newb); int resample_init (struct resample_state *state, unsigned int oldrate, unsigned int newrate); signed int MP3FixedToShort (mad_fixed_t sample); void ApplyFilter(struct mad_frame *Frame); // this method fills the buffer and writes it into the stream // void UpdateBuffer(); // this methoed needs to implemented by YOU // void FillBuffer(TInt16* buffer, TUint len); // TInt FillBuffer(); // we will also need these... protected: // TInt16* iSoundData; // sound buffer // TPtr8* iSoundBuf; // descriptor for using our soundbuffer TBool bFileOpened; private: CMP3Decode(); void ConstructL (); TFileName strFileNameMP3; RFs *iFileSession; RFile iFile; // mp3 struct mad_stream Stream; struct mad_frame Frame; struct mad_synth Synth; mad_timer_t Timer; int FrameCount; int Status; int iFileCurPos; // int iDecoding; // int iDecoded; #define INPUT_BUFFER_SIZE 10000 #define OUTPUT_BUFFER_SIZE 8192 int iOutputBufferCurrent; int iOutputBufferLength[2]; unsigned char InputBuffer[INPUT_BUFFER_SIZE+MAD_BUFFER_GUARD]; unsigned char InputBuffer2[INPUT_BUFFER_SIZE+MAD_BUFFER_GUARD]; TPtr8 *iInputBuf; TInt16 OutputBuffer[2][OUTPUT_BUFFER_SIZE]; // TPtr8* iSoundBuf2[2]; // descriptor for using our soundbuffer mad_fixed_t iEqualizer[32]; TInt iResampleRate; }; #endif