iot/yoradio
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

code upload

Browse Source
This commit is contained in:
e2002
2022-02-04 17:30:12 +03:00
parent fe3f0a261e
commit 3565d2fa17
44 changed files with 25103 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3822
yoRadio/src/audioI2S/mp3_decoder/mp3_decoder.cpp Normal file
View File

File diff suppressed because it is too large Load Diff

513
yoRadio/src/audioI2S/mp3_decoder/mp3_decoder.h Normal file
View File

@@ -0,0 +1,513 @@
// 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