// based om helix mp3 decoder #pragma once #include "Arduino.h" #include "assert.h" static const uint8_t m_HUFF_PAIRTABS =32; static const uint8_t m_BLOCK_SIZE =18; static const uint8_t m_NBANDS =32; static const uint8_t m_MAX_REORDER_SAMPS =(192-126)*3; // largest critical band for short blocks (see sfBandTable) static const uint16_t m_VBUF_LENGTH =17*2* m_NBANDS; // for double-sized vbuf FIFO static const uint8_t m_MAX_SCFBD =4; // max scalefactor bands per channel static const uint16_t m_MAINBUF_SIZE =1940; static const uint8_t m_MAX_NGRAN =2; // max granules static const uint8_t m_MAX_NCHAN =2; // max channels static const uint16_t m_MAX_NSAMP =576; // max samples per channel, per granule enum { ERR_MP3_NONE = 0, ERR_MP3_INDATA_UNDERFLOW = -1, ERR_MP3_MAINDATA_UNDERFLOW = -2, ERR_MP3_FREE_BITRATE_SYNC = -3, ERR_MP3_OUT_OF_MEMORY = -4, ERR_MP3_NULL_POINTER = -5, ERR_MP3_INVALID_FRAMEHEADER = -6, ERR_MP3_INVALID_SIDEINFO = -7, ERR_MP3_INVALID_SCALEFACT = -8, ERR_MP3_INVALID_HUFFCODES = -9, ERR_MP3_INVALID_DEQUANTIZE = -10, ERR_MP3_INVALID_IMDCT = -11, ERR_MP3_INVALID_SUBBAND = -12, ERR_UNKNOWN = -9999 }; typedef struct MP3FrameInfo { int bitrate; int nChans; int samprate; int bitsPerSample; int outputSamps; int layer; int version; } MP3FrameInfo_t; typedef struct SFBandTable { int/*short*/ l[23]; int/*short*/ s[14]; } SFBandTable_t; typedef struct BitStreamInfo { unsigned char *bytePtr; unsigned int iCache; int cachedBits; int nBytes; } BitStreamInfo_t; typedef enum { /* map these to the corresponding 2-bit values in the frame header */ Stereo = 0x00, /* two independent channels, but L and R frames might have different # of bits */ Joint = 0x01, /* coupled channels - layer III: mix of M-S and intensity, Layers I/II: intensity and direct coding only */ Dual = 0x02, /* two independent channels, L and R always have exactly 1/2 the total bitrate */ Mono = 0x03 /* one channel */ } StereoMode_t; typedef enum { /* map to 0,1,2 to make table indexing easier */ MPEG1 = 0, MPEG2 = 1, MPEG25 = 2 } MPEGVersion_t; typedef struct FrameHeader { int layer; /* layer index (1, 2, or 3) */ int crc; /* CRC flag: 0 = disabled, 1 = enabled */ int brIdx; /* bitrate index (0 - 15) */ int srIdx; /* sample rate index (0 - 2) */ int paddingBit; /* padding flag: 0 = no padding, 1 = single pad byte */ int privateBit; /* unused */ int modeExt; /* used to decipher joint stereo mode */ int copyFlag; /* copyright flag: 0 = no, 1 = yes */ int origFlag; /* original flag: 0 = copy, 1 = original */ int emphasis; /* deemphasis mode */ int CRCWord; /* CRC word (16 bits, 0 if crc not enabled) */ } FrameHeader_t; typedef struct SideInfoSub { int part23Length; /* number of bits in main data */ int nBigvals; /* 2x this = first set of Huffman cw's (maximum amplitude can be > 1) */ int globalGain; /* overall gain for dequantizer */ int sfCompress; /* unpacked to figure out number of bits in scale factors */ int winSwitchFlag; /* window switching flag */ int blockType; /* block type */ int mixedBlock; /* 0 = regular block (all short or long), 1 = mixed block */ int tableSelect[3]; /* index of Huffman tables for the big values regions */ int subBlockGain[3]; /* subblock gain offset, relative to global gain */ int region0Count; /* 1+region0Count = num scale factor bands in first region of bigvals */ int region1Count; /* 1+region1Count = num scale factor bands in second region of bigvals */ int preFlag; /* for optional high frequency boost */ int sfactScale; /* scaling of the scalefactors */ int count1TableSelect; /* index of Huffman table for quad codewords */ } SideInfoSub_t; typedef struct SideInfo { int mainDataBegin; int privateBits; int scfsi[m_MAX_NCHAN][m_MAX_SCFBD]; /* 4 scalefactor bands per channel */ } SideInfo_t; typedef struct { int cbType; /* pure long = 0, pure short = 1, mixed = 2 */ int cbEndS[3]; /* number nonzero short cb's, per subbblock */ int cbEndSMax; /* max of cbEndS[] */ int cbEndL; /* number nonzero long cb's */ } CriticalBandInfo_t; typedef struct DequantInfo { int workBuf[m_MAX_REORDER_SAMPS]; /* workbuf for reordering short blocks */ } DequantInfo_t; typedef struct HuffmanInfo { int huffDecBuf[m_MAX_NCHAN][m_MAX_NSAMP]; /* used both for decoded Huffman values and dequantized coefficients */ int nonZeroBound[m_MAX_NCHAN]; /* number of coeffs in huffDecBuf[ch] which can be > 0 */ int gb[m_MAX_NCHAN]; /* minimum number of guard bits in huffDecBuf[ch] */ } HuffmanInfo_t; typedef enum HuffTabType { noBits, oneShot, loopNoLinbits, loopLinbits, quadA, quadB, invalidTab } HuffTabType_t; typedef struct HuffTabLookup { int linBits; int tabType; /*HuffTabType*/ } HuffTabLookup_t; typedef struct IMDCTInfo { int outBuf[m_MAX_NCHAN][m_BLOCK_SIZE][m_NBANDS]; /* output of IMDCT */ int overBuf[m_MAX_NCHAN][m_MAX_NSAMP / 2]; /* overlap-add buffer (by symmetry, only need 1/2 size) */ int numPrevIMDCT[m_MAX_NCHAN]; /* how many IMDCT's calculated in this channel on prev. granule */ int prevType[m_MAX_NCHAN]; int prevWinSwitch[m_MAX_NCHAN]; int gb[m_MAX_NCHAN]; } IMDCTInfo_t; typedef struct BlockCount { int nBlocksLong; int nBlocksTotal; int nBlocksPrev; int prevType; int prevWinSwitch; int currWinSwitch; int gbIn; int gbOut; } BlockCount_t; typedef struct ScaleFactorInfoSub { /* max bits in scalefactors = 5, so use char's to save space */ char l[23]; /* [band] */ char s[13][3]; /* [band][window] */ } ScaleFactorInfoSub_t; typedef struct ScaleFactorJS { /* used in MPEG 2, 2.5 intensity (joint) stereo only */ int intensityScale; int slen[4]; int nr[4]; } ScaleFactorJS_t; /* NOTE - could get by with smaller vbuf if memory is more important than speed * (in Subband, instead of replicating each block in FDCT32 you would do a memmove on the * last 15 blocks to shift them down one, a hardware style FIFO) */ typedef struct SubbandInfo { int vbuf[m_MAX_NCHAN * m_VBUF_LENGTH]; /* vbuf for fast DCT-based synthesis PQMF - double size for speed (no modulo indexing) */ int vindex; /* internal index for tracking position in vbuf */ } SubbandInfo_t; typedef struct MP3DecInfo { /* buffer which must be large enough to hold largest possible main_data section */ unsigned char mainBuf[m_MAINBUF_SIZE]; /* special info for "free" bitrate files */ int freeBitrateFlag; int freeBitrateSlots; /* user-accessible info */ int bitrate; int nChans; int samprate; int nGrans; /* granules per frame */ int nGranSamps; /* samples per granule */ int nSlots; int layer; int mainDataBegin; int mainDataBytes; int part23Length[m_MAX_NGRAN][m_MAX_NCHAN]; } MP3DecInfo_t; /* format = Q31 * #define M_PI 3.14159265358979323846 * double u = 2.0 * M_PI / 9.0; * float c0 = sqrt(3.0) / 2.0; * float c1 = cos(u); * float c2 = cos(2*u); * float c3 = sin(u); * float c4 = sin(2*u); */ const int c9_0 = 0x6ed9eba1; const int c9_1 = 0x620dbe8b; const int c9_2 = 0x163a1a7e; const int c9_3 = 0x5246dd49; const int c9_4 = 0x7e0e2e32; const int c3_0 = 0x6ed9eba1; /* format = Q31, cos(pi/6) */ const int c6[3] = { 0x7ba3751d, 0x5a82799a, 0x2120fb83 }; /* format = Q31, cos(((0:2) + 0.5) * (pi/6)) */ /* format = Q31 * cos(((0:8) + 0.5) * (pi/18)) */ const uint32_t c18[9] = { 0x7f834ed0, 0x7ba3751d, 0x7401e4c1, 0x68d9f964, 0x5a82799a, 0x496af3e2, 0x36185aee, 0x2120fb83, 0x0b27eb5c}; /* scale factor lengths (num bits) */ const char m_SFLenTab[16][2] = { {0, 0}, {0, 1}, {0, 2}, {0, 3}, {3, 0}, {1, 1}, {1, 2}, {1, 3}, {2, 1}, {2, 2}, {2, 3}, {3, 1}, {3, 2}, {3, 3}, {4, 2}, {4, 3}}; /* NRTab[size + 3*is_right][block type][partition] * block type index: 0 = (bt0,bt1,bt3), 1 = bt2 non-mixed, 2 = bt2 mixed * partition: scale factor groups (sfb1 through sfb4) * for block type = 2 (mixed or non-mixed) / by 3 is rolled into this table * (for 3 short blocks per long block) * see 2.4.3.2 in MPEG 2 (low sample rate) spec * stuff rolled into this table: * NRTab[x][1][y] --> (NRTab[x][1][y]) / 3 * NRTab[x][2][>=1] --> (NRTab[x][2][>=1]) / 3 (first partition is long block) */ const char NRTab[6][3][4] = { {{ 6, 5, 5, 5}, {3, 3, 3, 3}, {6, 3, 3, 3}}, {{ 6, 5, 7, 3}, {3, 3, 4, 2}, {6, 3, 4, 2}}, {{11, 10, 0, 0}, {6, 6, 0, 0}, {6, 3, 6, 0}}, {{ 7, 7, 7, 0}, {4, 4, 4, 0}, {6, 5, 4, 0}}, {{ 6, 6, 6, 3}, {4, 3, 3, 2}, {6, 4, 3, 2}}, {{ 8, 8, 5, 0}, {5, 4, 3, 0}, {6, 6, 3, 0}} }; /* optional pre-emphasis for high-frequency scale factor bands */ const char preTab[22] = { 0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,2,2,3,3,3,2,0 }; /* pow(2,-i/4) for i=0..3, Q31 format */ const int pow14[4] PROGMEM = { 0x7fffffff, 0x6ba27e65, 0x5a82799a, 0x4c1bf829 }; /* * Minimax polynomial approximation to pow(x, 4/3), over the range * poly43lo: x = [0.5, 0.7071] * poly43hi: x = [0.7071, 1.0] * * Relative error < 1E-7 * Coefs are scaled by 4, 2, 1, 0.5, 0.25 */ const unsigned int poly43lo[5] PROGMEM = { 0x29a0bda9, 0xb02e4828, 0x5957aa1b, 0x236c498d, 0xff581859 }; const unsigned int poly43hi[5] PROGMEM = { 0x10852163, 0xd333f6a4, 0x46e9408b, 0x27c2cef0, 0xfef577b4 }; /* pow(2, i*4/3) as exp and frac */ const int pow2exp[8] PROGMEM = { 14, 13, 11, 10, 9, 7, 6, 5 }; const int pow2frac[8] PROGMEM = { 0x6597fa94, 0x50a28be6, 0x7fffffff, 0x6597fa94, 0x50a28be6, 0x7fffffff, 0x6597fa94, 0x50a28be6 }; const uint16_t m_HUFF_OFFSET_01= 0; const uint16_t m_HUFF_OFFSET_02= 9 + m_HUFF_OFFSET_01; const uint16_t m_HUFF_OFFSET_03= 65 + m_HUFF_OFFSET_02; const uint16_t m_HUFF_OFFSET_05= 65 + m_HUFF_OFFSET_03; const uint16_t m_HUFF_OFFSET_06=257 + m_HUFF_OFFSET_05; const uint16_t m_HUFF_OFFSET_07=129 + m_HUFF_OFFSET_06; const uint16_t m_HUFF_OFFSET_08=110 + m_HUFF_OFFSET_07; const uint16_t m_HUFF_OFFSET_09=280 + m_HUFF_OFFSET_08; const uint16_t m_HUFF_OFFSET_10= 93 + m_HUFF_OFFSET_09; const uint16_t m_HUFF_OFFSET_11=320 + m_HUFF_OFFSET_10; const uint16_t m_HUFF_OFFSET_12=296 + m_HUFF_OFFSET_11; const uint16_t m_HUFF_OFFSET_13=185 + m_HUFF_OFFSET_12; const uint16_t m_HUFF_OFFSET_15=497 + m_HUFF_OFFSET_13; const uint16_t m_HUFF_OFFSET_16=580 + m_HUFF_OFFSET_15; const uint16_t m_HUFF_OFFSET_24=651 + m_HUFF_OFFSET_16; const int huffTabOffset[m_HUFF_PAIRTABS] PROGMEM = { 0, m_HUFF_OFFSET_01, m_HUFF_OFFSET_02, m_HUFF_OFFSET_03, 0, m_HUFF_OFFSET_05, m_HUFF_OFFSET_06, m_HUFF_OFFSET_07, m_HUFF_OFFSET_08, m_HUFF_OFFSET_09, m_HUFF_OFFSET_10, m_HUFF_OFFSET_11, m_HUFF_OFFSET_12, m_HUFF_OFFSET_13, 0, m_HUFF_OFFSET_15, m_HUFF_OFFSET_16, m_HUFF_OFFSET_16, m_HUFF_OFFSET_16, m_HUFF_OFFSET_16, m_HUFF_OFFSET_16, m_HUFF_OFFSET_16, m_HUFF_OFFSET_16, m_HUFF_OFFSET_16, m_HUFF_OFFSET_24, m_HUFF_OFFSET_24, m_HUFF_OFFSET_24, m_HUFF_OFFSET_24, m_HUFF_OFFSET_24, m_HUFF_OFFSET_24, m_HUFF_OFFSET_24, m_HUFF_OFFSET_24,}; const HuffTabLookup_t huffTabLookup[m_HUFF_PAIRTABS] PROGMEM = { { 0, noBits }, { 0, oneShot }, { 0, oneShot }, { 0, oneShot }, { 0, invalidTab }, { 0, oneShot }, { 0, oneShot }, { 0, loopNoLinbits }, { 0, loopNoLinbits }, { 0, loopNoLinbits }, { 0, loopNoLinbits }, { 0, loopNoLinbits }, { 0, loopNoLinbits }, { 0, loopNoLinbits }, { 0, invalidTab }, { 0, loopNoLinbits }, { 1, loopLinbits }, { 2, loopLinbits }, { 3, loopLinbits }, { 4, loopLinbits }, { 6, loopLinbits }, { 8, loopLinbits }, { 10, loopLinbits }, { 13, loopLinbits }, { 4, loopLinbits }, { 5, loopLinbits }, { 6, loopLinbits }, { 7, loopLinbits }, { 8, loopLinbits }, { 9, loopLinbits }, { 11, loopLinbits }, { 13, loopLinbits }, }; const int quadTabOffset[2] PROGMEM = {0, 64}; const int quadTabMaxBits[2] PROGMEM = {6, 4}; /* indexing = [version][samplerate index] * sample rate of frame (Hz) */ const int samplerateTab[3][3] PROGMEM = { { 44100, 48000, 32000 }, /* MPEG-1 */ { 22050, 24000, 16000 }, /* MPEG-2 */ { 11025, 12000, 8000 }, /* MPEG-2.5 */ }; /* indexing = [version][layer] * number of samples in one frame (per channel) */ const int/*short*/samplesPerFrameTab[3][3] PROGMEM = { { 384, 1152, 1152 }, /* MPEG1 */ { 384, 1152, 576 }, /* MPEG2 */ { 384, 1152, 576 }, /* MPEG2.5 */ }; /* layers 1, 2, 3 */ const short bitsPerSlotTab[3] = { 32, 8, 8 }; /* indexing = [version][mono/stereo] * number of bytes in side info section of bitstream */ const int/*short*/sideBytesTab[3][2] PROGMEM = { { 17, 32 }, /* MPEG-1: mono, stereo */ { 9, 17 }, /* MPEG-2: mono, stereo */ { 9, 17 }, /* MPEG-2.5: mono, stereo */ }; /* indexing = [version][sampleRate][long (.l) or short (.s) block] * sfBandTable[v][s].l[cb] = index of first bin in critical band cb (long blocks) * sfBandTable[v][s].s[cb] = index of first bin in critical band cb (short blocks) */ const SFBandTable_t sfBandTable[3][3] PROGMEM = { { /* MPEG-1 (44, 48, 32 kHz) */ { {0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 52, 62, 74, 90, 110, 134, 162, 196, 238, 288, 342, 418, 576 }, {0, 4, 8, 12, 16, 22, 30, 40, 52, 66, 84, 106, 136, 192} }, { {0, 4, 8, 12, 16, 20, 24, 30, 36, 42, 50, 60, 72, 88, 106, 128, 156, 190, 230, 276, 330, 384, 576 }, {0, 4, 8, 12, 16, 22, 28, 38, 50, 64, 80, 100, 126, 192} }, { {0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 54, 66, 82, 102, 126, 156, 194, 240, 296, 364, 448, 550, 576 }, {0, 4, 8, 12, 16, 22, 30, 42, 58, 78, 104, 138, 180, 192} } }, { /* MPEG-2 (22, 24, 16 kHz) */ { {0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576 }, {0, 4, 8, 12, 18, 24, 32, 42, 56, 74, 100, 132, 174, 192} }, { {0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 114, 136, 162, 194, 232, 278, 332, 394, 464, 540, 576 }, {0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 136, 180, 192} }, { {0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576 }, {0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192} }, }, { /* MPEG-2.5 (11, 12, 8 kHz) */ { {0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576 }, {0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192 } }, { {0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576 }, {0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192 } }, { {0, 12, 24, 36, 48, 60, 72, 88, 108, 132, 160, 192, 232, 280, 336, 400, 476, 566, 568, 570, 572, 574, 576 }, {0, 8, 16, 24, 36, 52, 72, 96, 124, 160, 162, 164, 166, 192 } }, }, }; /* indexing = [intensity scale on/off][left/right] * format = Q30, range = [0.0, 1.414] * * illegal intensity position scalefactors (see comments on ISFMpeg1) */ const int ISFIIP[2][2] PROGMEM = { {0x40000000, 0x00000000}, /* mid-side off */ {0x40000000, 0x40000000}, /* mid-side on */ }; const unsigned char uniqueIDTab[8] = {0x5f, 0x4b, 0x43, 0x5f, 0x5f, 0x4a, 0x52, 0x5f}; /* anti-alias coefficients - see spec Annex B, table 3-B.9 * csa[0][i] = CSi, csa[1][i] = CAi * format = Q31 */ const uint32_t csa[8][2] PROGMEM = { {0x6dc253f0, 0xbe2500aa}, {0x70dcebe4, 0xc39e4949}, {0x798d6e73, 0xd7e33f4a}, {0x7ddd40a7, 0xe8b71176}, {0x7f6d20b7, 0xf3e4fe2f}, {0x7fe47e40, 0xfac1a3c7}, {0x7ffcb263, 0xfe2ebdc6}, {0x7fffc694, 0xff86c25d}, }; /* format = Q30, right shifted by 12 (sign bits only in top 12 - undo this when rounding to short) * this is to enable early-terminating multiplies on ARM * range = [-1.144287109, 1.144989014] * max gain of filter (per output sample) ~= 2.731 * * new (properly sign-flipped) values * - these actually are correct to 32 bits, (floating-pt coefficients in spec * chosen such that only ~20 bits are required) * * Reordering - see table 3-B.3 in spec (appendix B) * * polyCoef[i] = * D[ 0, 32, 64, ... 480], i = [ 0, 15] * D[ 1, 33, 65, ... 481], i = [ 16, 31] * D[ 2, 34, 66, ... 482], i = [ 32, 47] * ... * D[15, 47, 79, ... 495], i = [240,255] * * also exploits symmetry: D[i] = -D[512 - i], for i = [1, 255] * * polyCoef[256, 257, ... 263] are for special case of sample 16 (out of 0) * see PolyphaseStereo() and PolyphaseMono() */ // prototypes bool MP3Decoder_AllocateBuffers(void); void MP3Decoder_FreeBuffers(); int MP3Decode( unsigned char *inbuf, int *bytesLeft, short *outbuf, int useSize); void MP3GetLastFrameInfo(); int MP3GetNextFrameInfo(unsigned char *buf); int MP3FindSyncWord(unsigned char *buf, int nBytes); int MP3GetSampRate(); int MP3GetChannels(); int MP3GetBitsPerSample(); int MP3GetBitrate(); int MP3GetOutputSamps(); //internally used void MP3Decoder_ClearBuffer(void); void PolyphaseMono(short *pcm, int *vbuf, const uint32_t *coefBase); void PolyphaseStereo(short *pcm, int *vbuf, const uint32_t *coefBase); void SetBitstreamPointer(BitStreamInfo_t *bsi, int nBytes, unsigned char *buf); unsigned int GetBits(BitStreamInfo_t *bsi, int nBits); int CalcBitsUsed(BitStreamInfo_t *bsi, unsigned char *startBuf, int startOffset); int DequantChannel(int *sampleBuf, int *workBuf, int *nonZeroBound, SideInfoSub_t *sis, ScaleFactorInfoSub_t *sfis, CriticalBandInfo_t *cbi); void MidSideProc(int x[m_MAX_NCHAN][m_MAX_NSAMP], int nSamps, int mOut[2]); void IntensityProcMPEG1(int x[m_MAX_NCHAN][m_MAX_NSAMP], int nSamps, ScaleFactorInfoSub_t *sfis, CriticalBandInfo_t *cbi, int midSideFlag, int mixFlag, int mOut[2]); void IntensityProcMPEG2(int x[m_MAX_NCHAN][m_MAX_NSAMP], int nSamps, ScaleFactorInfoSub_t *sfis, CriticalBandInfo_t *cbi, ScaleFactorJS_t *sfjs, int midSideFlag, int mixFlag, int mOut[2]); void FDCT32(int *x, int *d, int offset, int oddBlock, int gb);// __attribute__ ((section (".data"))); void FreeBuffers(); int CheckPadBit(); int UnpackFrameHeader(unsigned char *buf); int UnpackSideInfo(unsigned char *buf); int DecodeHuffman( unsigned char *buf, int *bitOffset, int huffBlockBits, int gr, int ch); int MP3Dequantize( int gr); int IMDCT( int gr, int ch); int UnpackScaleFactors( unsigned char *buf, int *bitOffset, int bitsAvail, int gr, int ch); int Subband(short *pcmBuf); short ClipToShort(int x, int fracBits); void RefillBitstreamCache(BitStreamInfo_t *bsi); void UnpackSFMPEG1(BitStreamInfo_t *bsi, SideInfoSub_t *sis, ScaleFactorInfoSub_t *sfis, int *scfsi, int gr, ScaleFactorInfoSub_t *sfisGr0); void UnpackSFMPEG2(BitStreamInfo_t *bsi, SideInfoSub_t *sis, ScaleFactorInfoSub_t *sfis, int gr, int ch, int modeExt, ScaleFactorJS_t *sfjs); int MP3FindFreeSync(unsigned char *buf, unsigned char firstFH[4], int nBytes); void MP3ClearBadFrame( short *outbuf); int DecodeHuffmanPairs(int *xy, int nVals, int tabIdx, int bitsLeft, unsigned char *buf, int bitOffset); int DecodeHuffmanQuads(int *vwxy, int nVals, int tabIdx, int bitsLeft, unsigned char *buf, int bitOffset); int DequantBlock(int *inbuf, int *outbuf, int num, int scale); void AntiAlias(int *x, int nBfly); void WinPrevious(int *xPrev, int *xPrevWin, int btPrev); int FreqInvertRescale(int *y, int *xPrev, int blockIdx, int es); void idct9(int *x); int IMDCT36(int *xCurr, int *xPrev, int *y, int btCurr, int btPrev, int blockIdx, int gb); void imdct12(int *x, int *out); int IMDCT12x3(int *xCurr, int *xPrev, int *y, int btPrev, int blockIdx, int gb); int HybridTransform(int *xCurr, int *xPrev, int y[m_BLOCK_SIZE][m_NBANDS], SideInfoSub_t *sis, BlockCount_t *bc); inline uint64_t SAR64(uint64_t x, int n) {return x >> n;} inline int MULSHIFT32(int x, int y) { int z; z = (uint64_t) x * (uint64_t) y >> 32; return z;} inline uint64_t MADD64(uint64_t sum64, int x, int y) {sum64 += (uint64_t) x * (uint64_t) y; return sum64;}/* returns 64-bit value in [edx:eax] */ inline uint64_t xSAR64(uint64_t x, int n){return x >> n;} inline int FASTABS(int x){ return __builtin_abs(x);} //xtensa has a fast abs instruction //fb #define CLZ(x) __builtin_clz(x) //fb