diff options
Diffstat (limited to 'akode/plugins/mpc_decoder/mppdec/mpc_dec.h')
| -rw-r--r-- | akode/plugins/mpc_decoder/mppdec/mpc_dec.h | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/akode/plugins/mpc_decoder/mppdec/mpc_dec.h b/akode/plugins/mpc_decoder/mppdec/mpc_dec.h new file mode 100644 index 0000000..e6d37ae --- /dev/null +++ b/akode/plugins/mpc_decoder/mppdec/mpc_dec.h @@ -0,0 +1,200 @@ +#ifndef _mpp_dec_h_ +#define _mpp_dec_h_ + + +#ifdef WIN32 +#define MPC_LITTLE_ENDIAN +#endif + + +#include <assert.h> + +#include "mpc_math.h" + + +class MPC_reader { +public: + virtual size_t read ( void *ptr, size_t size ) = 0; + virtual bool seek ( int offset, int origin ) = 0; + virtual long tell () = 0; + virtual long get_size () = 0; + virtual bool canseek() = 0; +}; + +class MPC_decoder { +public: + MPC_decoder(MPC_reader *r, double scale_factor = 1.0); + ~MPC_decoder(); + + bool Initialize(const class StreamInfo *si); + void ScaleOutput(double factor); + unsigned int Decode(MPC_SAMPLE_FORMAT *buffer, unsigned int * vbr_update_acc = 0, unsigned int * vbr_update_bits = 0); + bool SeekSeconds(double seconds); + bool SeekSample(MPC_INT64 sample); + +public: + enum + { + FrameLength = (36 * 32), // samples per frame + SynthDelay = 481, + DecodeBufferLength = 4 * FrameLength + }; +private: + enum + { + EQ_TAP = 13, // length of FIR filter for EQ + DELAY = ((EQ_TAP + 1) / 2), // delay of FIR + FIR_BANDS = 4, // number of subbands to be FIR filtered + MEMSIZE = 16384, // overall buffer size + MEMSIZE2 = (MEMSIZE/2), // size of one buffer + MEMMASK = (MEMSIZE-1), + V_MEM = 2304 + }; + void SetStreamInfo ( const class StreamInfo *si ); + void UpdateBuffer ( unsigned int RING ); + void RESET_Synthesis ( void ); + void RESET_Globals ( void ); + + unsigned int BitsRead ( void ); + unsigned int decode_internal ( MPC_SAMPLE_FORMAT *buffer ); + void RESET_Y ( void ); + void Lese_Bitstrom_SV6 ( void ); + void Lese_Bitstrom_SV7 ( void ); + + void Requantisierung ( const int Last_Band ); + + unsigned int samples_to_skip; + + typedef struct { + int L [36]; + int R [36]; + } QuantTyp; + + typedef struct { + unsigned int Code; + unsigned int Length; + int Value; + } HuffmanTyp; + + static int HuffmanTyp_cmpfn ( const void* p1, const void* p2 ); + + MPC_reader *m_reader; + + unsigned int dword; // actually decoded 32bit-word + unsigned int pos; // bit-position within dword + unsigned int Speicher [MEMSIZE]; // read-buffer + unsigned int Zaehler; // actual index within read-buffer + + unsigned int FwdJumpInfo; + unsigned int ActDecodePos; + unsigned int FrameWasValid; + + unsigned int DecodedFrames; + unsigned int OverallFrames; + int SampleRate; // Sample frequency + + unsigned int StreamVersion; // version of bitstream + unsigned int MS_used; // MS-coding used ? + int Max_Band; + unsigned int MPCHeaderPos; // AB: needed to support ID3v2 + //unsigned int OverallFrames; + //unsigned int DecodedFrames; + unsigned int LastValidSamples; + unsigned int TrueGaplessPresent; + + unsigned int EQ_activated; + + unsigned int WordsRead; // counts amount of decoded dwords + unsigned short* SeekTable; + + /*static*/ unsigned int __r1; + /*static*/ unsigned int __r2; + + + int SCF_Index_L [32] [3]; + int SCF_Index_R [32] [3]; // holds scalefactor-indices + QuantTyp Q [32]; // holds quantized samples + int Res_L [32]; + int Res_R [32]; // holds the chosen quantizer for each subband + int DSCF_Flag_L [32]; + int DSCF_Flag_R [32]; // differential SCF used? + int SCFI_L [32]; + int SCFI_R [32]; // describes order of transmitted SCF + int DSCF_Reference_L [32]; + int DSCF_Reference_R [32]; // holds last frames SCF + int MS_Flag[32]; // MS used? + + + HuffmanTyp HuffHdr [10]; + HuffmanTyp HuffSCFI [ 4]; + HuffmanTyp HuffDSCF [16]; + HuffmanTyp* HuffQ [2] [8]; + + HuffmanTyp HuffQ1 [2] [3*3*3]; + HuffmanTyp HuffQ2 [2] [5*5]; + HuffmanTyp HuffQ3 [2] [ 7]; + HuffmanTyp HuffQ4 [2] [ 9]; + HuffmanTyp HuffQ5 [2] [15]; + HuffmanTyp HuffQ6 [2] [31]; + HuffmanTyp HuffQ7 [2] [63]; + + const HuffmanTyp* SampleHuff [18]; + HuffmanTyp SCFI_Bundle [ 8]; + HuffmanTyp DSCF_Entropie [13]; + HuffmanTyp Region_A [16]; + HuffmanTyp Region_B [ 8]; + HuffmanTyp Region_C [ 4]; + + HuffmanTyp Entropie_1 [ 3]; + HuffmanTyp Entropie_2 [ 5]; + HuffmanTyp Entropie_3 [ 7]; + HuffmanTyp Entropie_4 [ 9]; + HuffmanTyp Entropie_5 [15]; + HuffmanTyp Entropie_6 [31]; + HuffmanTyp Entropie_7 [63]; + + MPC_SAMPLE_FORMAT V_L [V_MEM + 960]; + MPC_SAMPLE_FORMAT V_R [V_MEM + 960]; + MPC_SAMPLE_FORMAT Y_L [36] [32]; + MPC_SAMPLE_FORMAT Y_R [36] [32]; + + MPC_SAMPLE_FORMAT SCF [256]; // holds adapted scalefactors (for clipping prevention) +#ifdef MPC_FIXED_POINT + unsigned char SCF_shift[256]; +#endif + unsigned int Q_bit [32]; // holds amount of bits to save chosen quantizer (SV6) + unsigned int Q_res [32] [16]; // holds conversion: index -> quantizer (SV6) + +private: // functions + void Reset_BitstreamDecode ( void ); + unsigned int Bitstream_read ( const unsigned int ); + int Huffman_Decode ( const HuffmanTyp* ); // works with maximum lengths up to 14 + int Huffman_Decode_fast ( const HuffmanTyp* ); // works with maximum lengths up to 10 + int Huffman_Decode_faster ( const HuffmanTyp* ); // works with maximum lengths up to 5 + void SCFI_Bundle_read ( const HuffmanTyp*, int*, int* ); + + void Reset_V ( void ); + void Synthese_Filter_float ( MPC_SAMPLE_FORMAT * dst ); + unsigned int random_int ( void ); + + void EQSet ( int on, char data[10], int preamp ); + void Helper1 ( unsigned long bitpos ); + void Helper2 ( unsigned long bitpos ); + void Helper3 ( unsigned long bitpos, unsigned long* buffoffs ); + void Huffman_SV6_Encoder ( void ); + void Huffman_SV6_Decoder ( void ); + void Huffman_SV7_Encoder ( void ); + void Huffman_SV7_Decoder ( void ); + + void initialisiere_Quantisierungstabellen ( double ); + void Quantisierungsmodes ( void ); // conversion: index -> quantizer (bitstream reading) + void Resort_HuffTables ( const unsigned int elements, HuffmanTyp* Table, const int offset ); +private: + inline int f_read ( void *ptr, size_t size) { return m_reader->read (ptr, size); }; + int f_read_dword( unsigned int * ptr, unsigned int count); + inline bool f_seek ( int offset, int origin) { return m_reader->seek (offset, origin); }; +}; + +#include "streaminfo.h" + +#endif |