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https://github.com/hajimehoshi/ebiten.git
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111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
#ifndef PDMP3_H
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#define PDMP3_H
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#include <stddef.h>
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#include <stdint.h>
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//#define DEBUG
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#define IMDCT_TABLES
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#define IMDCT_NTABLES
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#define POW34_ITERATE
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#define POW34_TABLE
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#define OUTPUT_RAW
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#define OK 0
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#define ERROR -1
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#define TRUE 1
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#define FALSE 0
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/* Types used in the frame header */
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typedef enum { /* Layer number */
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mpeg1_layer_reserved = 0,
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mpeg1_layer_3 = 1,
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mpeg1_layer_2 = 2,
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mpeg1_layer_1 = 3
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}
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t_mpeg1_layer;
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typedef enum { /* Modes */
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mpeg1_mode_stereo = 0,
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mpeg1_mode_joint_stereo,
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mpeg1_mode_dual_channel,
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mpeg1_mode_single_channel
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}
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t_mpeg1_mode;
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typedef struct { /* MPEG1 Layer 1-3 frame header */
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unsigned id; /* 1 bit */
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t_mpeg1_layer layer; /* 2 bits */
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unsigned protection_bit; /* 1 bit */
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unsigned bitrate_index; /* 4 bits */
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unsigned sampling_frequency; /* 2 bits */
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unsigned padding_bit; /* 1 bit */
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unsigned private_bit; /* 1 bit */
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t_mpeg1_mode mode; /* 2 bits */
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unsigned mode_extension; /* 2 bits */
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unsigned copyright; /* 1 bit */
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unsigned original_or_copy; /* 1 bit */
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unsigned emphasis; /* 2 bits */
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}
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t_mpeg1_header;
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typedef struct { /* MPEG1 Layer 3 Side Information : [2][2] means [gr][ch] */
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unsigned main_data_begin; /* 9 bits */
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unsigned private_bits; /* 3 bits in mono,5 in stereo */
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unsigned scfsi[2][4]; /* 1 bit */
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unsigned part2_3_length[2][2]; /* 12 bits */
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unsigned big_values[2][2]; /* 9 bits */
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unsigned global_gain[2][2]; /* 8 bits */
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unsigned scalefac_compress[2][2]; /* 4 bits */
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unsigned win_switch_flag[2][2]; /* 1 bit */
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/* if(win_switch_flag[][]) */ //use a union dammit
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unsigned block_type[2][2]; /* 2 bits */
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unsigned mixed_block_flag[2][2]; /* 1 bit */
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unsigned table_select[2][2][3]; /* 5 bits */
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unsigned subblock_gain[2][2][3]; /* 3 bits */
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/* else */
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/* table_select[][][] */
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unsigned region0_count[2][2]; /* 4 bits */
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unsigned region1_count[2][2]; /* 3 bits */
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/* end */
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unsigned preflag[2][2]; /* 1 bit */
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unsigned scalefac_scale[2][2]; /* 1 bit */
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unsigned count1table_select[2][2];/* 1 bit */
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unsigned count1[2][2]; /* Not in file,calc. by huff.dec.! */
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}
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t_mpeg1_side_info;
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typedef struct { /* MPEG1 Layer 3 Main Data */
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unsigned scalefac_l[2][2][21]; /* 0-4 bits */
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unsigned scalefac_s[2][2][12][3]; /* 0-4 bits */
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float is[2][2][576]; /* Huffman coded freq. lines */
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}
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t_mpeg1_main_data;
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typedef struct { /* Scale factor band indices,for long and short windows */
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unsigned l[23];
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unsigned s[14];
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}
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t_sf_band_indices;
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unsigned Get_Byte(void);
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unsigned Get_Bytes(unsigned num, unsigned* data_vec);
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unsigned Get_Filepos(void);
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int Decode_L3(void);
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int Read_Frame(void);
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size_t writeToWriter(void* data, int size);
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unsigned Get_Main_Pos(void);
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int Set_Main_Pos(unsigned bit_pos);
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int Read_Main_L3(void);
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int Read_Audio_L3(void);
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static int Read_Header(void);
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void Read_Huffman(unsigned part_2_start,unsigned gr,unsigned ch);
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void L3_Hybrid_Synthesis(unsigned gr,unsigned ch);
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void L3_Frequency_Inversion(unsigned gr,unsigned ch);
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void L3_Subband_Synthesis(unsigned gr,unsigned ch, unsigned* outdata);
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int Read_CRC(void);
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int Huffman_Decode(unsigned table_num, int32_t* x, int32_t*y, int32_t* v, int32_t* w);
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#endif
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