layer3.h
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上传用户:hxb_1234
上传日期:2010-03-30
资源大小:8328k
文件大小:2k
源码类别:
VC书籍
开发平台:
Visual C++
- /* layer3.h
- Declarations for the Layer III decoder object */
- #ifndef LAYERIII_H
- #define LAYERIII_H
- #include "all.h"
- #include "l3type.h"
- #include "ibitstr.h"
- #include "obuffer.h"
- #include "bit_res.h"
- #include "header.h"
- #include "synfilt.h"
- #define SSLIMIT 18
- #define SBLIMIT 32
- /* Size of the table of whole numbers raised to 4/3 power.
- This may be adjusted for performance without any problems. */
- #define POW_TABLE_LIMIT 512
- class LayerIII_Decoder {
- public:
- LayerIII_Decoder(Ibitstream *stream0, Header *header0,
- SynthesisFilter *filtera, SynthesisFilter *filterb,
- Obuffer *buffer0, enum e_channels which_ch0);
- ~LayerIII_Decoder();
- // Notify decoder that a seek is being made
- void seek_notify();
- // Decode one frame, filling the buffer with the output samples
- void decode();
- private:
- // private data
- int32 is_1d[SBLIMIT*SSLIMIT];
- real ro[2][SBLIMIT][SSLIMIT];
- real lr[2][SBLIMIT][SSLIMIT];
- real out_1d[SBLIMIT*SSLIMIT];
- real prevblck[2][SBLIMIT*SSLIMIT];
- real k[2][SBLIMIT*SSLIMIT];
- int32 nonzero[2];
- Ibitstream *stream;
- Header *header;
- SynthesisFilter *filter1, *filter2;
- Obuffer *buffer;
- enum e_channels which_channels;
- Bit_Reserve *br;
- III_side_info_t *si;
- III_scalefac_t scalefac;
- uint32 max_gr;
- int32 frame_start;
- int32 part2_start;
- uint32 channels;
- uint32 first_channel;
- uint32 last_channel;
- uint32 sfreq;
- // private member functions
- bool get_side_info();
- void get_scale_factors(uint32 ch, uint32 gr);
- void get_LSF_scale_data(uint32 ch, uint32 gr);
- void get_LSF_scale_factors(uint32 ch, uint32 gr);
- void huffman_decode(uint32 ch, uint32 gr);
- void i_stereo_k_values(uint32 is_pos, uint32 io_type, uint32 i);
- void dequantize_sample(real xr[SBLIMIT][SSLIMIT], uint32 ch, uint32 gr);
- void reorder(real xr[SBLIMIT][SSLIMIT], uint32 ch, uint32 gr);
- void stereo(uint32 gr);
- void antialias(uint32 ch, uint32 gr);
- void hybrid(uint32 ch, uint32 gr);
- void do_downmix();
- };
- #endif