146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
// Filename: mp3struct.h
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//
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// this file is my struct to gather all loose MP3 global vars into one struct so we can do multiple-stream decompression
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//
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#ifndef MP3STRUCT_H
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#define MP3STRUCT_H
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#pragma warning (disable : 4201 ) // nonstandard extension used : nameless struct/union
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#include "small_header.h" // for SAMPLE and IN_OUT
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#ifndef byte
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typedef unsigned char byte;
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#endif
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typedef void (*SBT_FUNCTION) (float *sample, short *pcm, int n);
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typedef void (*XFORM_FUNCTION) (void *pcm, int igr);
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typedef IN_OUT(*DECODE_FUNCTION) (unsigned char *bs, unsigned char *pcm);
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typedef struct
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{
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union
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{
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struct
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{
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SBT_FUNCTION sbt;
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float cs_factor[3][64]; // 768 bytes
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int nbat[4];
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int bat[4][16];
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int max_sb;
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int stereo_sb;
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int bit_skip;
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float* cs_factorL1;
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int nbatL1;
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};//L1_2;
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struct
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{
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SBT_FUNCTION sbt_L3;
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XFORM_FUNCTION Xform;
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DECODE_FUNCTION decode_function;
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SAMPLE sample[2][2][576]; // if this isn't kept per stream then the decode breaks up
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// the 4k version of these 2 seems to work for everything, but I'm reverting to original 8k for safety jic.
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//
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#define NBUF (8*1024)
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#define BUF_TRIGGER (NBUF-1500)
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// #define NBUF (4096) // 2048 works for all except 133+ kbps VBR files, 4096 copes with these
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// #define BUF_TRIGGER ((NBUF/4)*3)
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unsigned char buf[NBUF];
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int buf_ptr0;
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int buf_ptr1;
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int main_pos_bit;
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int band_limit_nsb;
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int nBand[2][22]; /* [long/short][cb] */
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int sfBandIndex[2][22]; /* [long/short][cb] */
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int half_outbytes;
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int crcbytes;
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int nchan;
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int ms_mode;
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int is_mode;
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unsigned int zero_level_pcm;
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int mpeg25_flag;
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int band_limit;
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int band_limit21;
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int band_limit12;
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int gain_adjust;
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int ncbl_mixed;
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};//L3;
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};
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// from csbt.c...
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//
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// if this isn't kept per stream then the decode breaks up
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signed int vb_ptr; //
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signed int vb2_ptr; //
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float vbuf[512]; //
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float vbuf2[512]; // this can be lost if we stick to mono samples
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// L3 only...
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//
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int sr_index; // L3 only (99%)
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int id;
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// any type...
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//
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int outvalues;
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int outbytes;
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int framebytes;
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int pad;
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int nsb_limit;
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// stuff added now that the game uses streaming MP3s...
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//
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byte *pbSourceData; // a useful dup ptr only, this whole struct will be owned by an sfx_t struct that has the actual data ptr field
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int iSourceBytesRemaining;
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int iSourceReadIndex;
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int iSourceFrameBytes;
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#ifdef _DEBUG
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int iSourceFrameCounter; // not really important
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#endif
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int iBytesDecodedTotal;
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int iBytesDecodedThisPacket;// not sure how useful this will be, it's only per-frame, so will always be full frame size (eg 2304 or below for mono) except possibly for the last frame?
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int iRewind_FinalReductionCode;
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int iRewind_FinalConvertCode;
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int iRewind_SourceBytesRemaining;
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int iRewind_SourceReadIndex;
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byte bDecodeBuffer[2304*2]; // *2 to allow for stereo now
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int iCopyOffset; // used for painting to DMA-feeder, since 2304 won't match the size it wants
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// some new stuff added for dynamic music, to allow "how many seconds left to play" queries...
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//
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// ( m_lengthInSeconds = ((iUnpackedDataLength / iRate) / iChannels) / iWidth; )
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//
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// Note that these fields are only valid/initialised if MP3Stream_InitPlayingTimeFields() was called.
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// If not, this->iTimeQuery_UnpackedLength will be zero.
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//
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int iTimeQuery_UnpackedLength;
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int iTimeQuery_SampleRate;
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int iTimeQuery_Channels;
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int iTimeQuery_Width;
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} MP3STREAM, *LP_MP3STREAM;
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#define MP3STUFF_KNOWN
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extern LP_MP3STREAM pMP3Stream;
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extern int bFastEstimateOnly;
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#pragma warning (default : 4201 ) // nonstandard extension used : nameless struct/union
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#pragma warning (disable : 4711 ) // function 'xxxx' selected for automatic inline expansion
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#endif // #ifndef MP3STRUCT_H
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////////////////// eof /////////////////////
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