Statistics
| Branch: | Revision:

ffmpeg / libavcodec / wma.h @ 84dc2d8a

History | View | Annotate | Download (6.26 KB)

1
/*
2
 * WMA compatible codec
3
 * Copyright (c) 2002-2007 The FFmpeg Project
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
#ifndef AVCODEC_WMA_H
23
#define AVCODEC_WMA_H
24

    
25
#include "get_bits.h"
26
#include "put_bits.h"
27
#include "dsputil.h"
28

    
29
/* size of blocks */
30
#define BLOCK_MIN_BITS 7
31
#define BLOCK_MAX_BITS 11
32
#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
33

    
34
#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
35

    
36
/* XXX: find exact max size */
37
#define HIGH_BAND_MAX_SIZE 16
38

    
39
#define NB_LSP_COEFS 10
40

    
41
/* XXX: is it a suitable value ? */
42
#define MAX_CODED_SUPERFRAME_SIZE 16384
43

    
44
#define MAX_CHANNELS 2
45

    
46
#define NOISE_TAB_SIZE 8192
47

    
48
#define LSP_POW_BITS 7
49

    
50
//FIXME should be in wmadec
51
#define VLCBITS 9
52
#define VLCMAX ((22+VLCBITS-1)/VLCBITS)
53

    
54
typedef float WMACoef;          ///< type for decoded coefficients, int16_t would be enough for wma 1/2
55

    
56
typedef struct CoefVLCTable {
57
    int n;                      ///< total number of codes
58
    int max_level;
59
    const uint32_t *huffcodes;  ///< VLC bit values
60
    const uint8_t *huffbits;    ///< VLC bit size
61
    const uint16_t *levels;     ///< table to build run/level tables
62
} CoefVLCTable;
63

    
64
typedef struct WMACodecContext {
65
    AVCodecContext* avctx;
66
    GetBitContext gb;
67
    PutBitContext pb;
68
    int sample_rate;
69
    int nb_channels;
70
    int bit_rate;
71
    int version;                            ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
72
    int block_align;
73
    int use_bit_reservoir;
74
    int use_variable_block_len;
75
    int use_exp_vlc;                        ///< exponent coding: 0 = lsp, 1 = vlc + delta
76
    int use_noise_coding;                   ///< true if perceptual noise is added
77
    int byte_offset_bits;
78
    VLC exp_vlc;
79
    int exponent_sizes[BLOCK_NB_SIZES];
80
    uint16_t exponent_bands[BLOCK_NB_SIZES][25];
81
    int high_band_start[BLOCK_NB_SIZES];    ///< index of first coef in high band
82
    int coefs_start;                        ///< first coded coef
83
    int coefs_end[BLOCK_NB_SIZES];          ///< max number of coded coefficients
84
    int exponent_high_sizes[BLOCK_NB_SIZES];
85
    int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
86
    VLC hgain_vlc;
87

    
88
    /* coded values in high bands */
89
    int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
90
    int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
91

    
92
    /* there are two possible tables for spectral coefficients */
93
//FIXME the following 3 tables should be shared between decoders
94
    VLC coef_vlc[2];
95
    uint16_t *run_table[2];
96
    float *level_table[2];
97
    uint16_t *int_table[2];
98
    const CoefVLCTable *coef_vlcs[2];
99
    /* frame info */
100
    int frame_len;                          ///< frame length in samples
101
    int frame_len_bits;                     ///< frame_len = 1 << frame_len_bits
102
    int nb_block_sizes;                     ///< number of block sizes
103
    /* block info */
104
    int reset_block_lengths;
105
    int block_len_bits;                     ///< log2 of current block length
106
    int next_block_len_bits;                ///< log2 of next block length
107
    int prev_block_len_bits;                ///< log2 of prev block length
108
    int block_len;                          ///< block length in samples
109
    int block_num;                          ///< block number in current frame
110
    int block_pos;                          ///< current position in frame
111
    uint8_t ms_stereo;                      ///< true if mid/side stereo mode
112
    uint8_t channel_coded[MAX_CHANNELS];    ///< true if channel is coded
113
    int exponents_bsize[MAX_CHANNELS];      ///< log2 ratio frame/exp. length
114
    DECLARE_ALIGNED(16, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
115
    float max_exponent[MAX_CHANNELS];
116
    WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
117
    DECLARE_ALIGNED(16, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
118
    DECLARE_ALIGNED(16, FFTSample, output)[BLOCK_MAX_SIZE * 2];
119
    FFTContext mdct_ctx[BLOCK_NB_SIZES];
120
    float *windows[BLOCK_NB_SIZES];
121
    /* output buffer for one frame and the last for IMDCT windowing */
122
    DECLARE_ALIGNED(16, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
123
    /* last frame info */
124
    uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
125
    int last_bitoffset;
126
    int last_superframe_len;
127
    float noise_table[NOISE_TAB_SIZE];
128
    int noise_index;
129
    float noise_mult; /* XXX: suppress that and integrate it in the noise array */
130
    /* lsp_to_curve tables */
131
    float lsp_cos_table[BLOCK_MAX_SIZE];
132
    float lsp_pow_e_table[256];
133
    float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
134
    float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
135
    DSPContext dsp;
136

    
137
#ifdef TRACE
138
    int frame_count;
139
#endif
140
} WMACodecContext;
141

    
142
extern const uint16_t ff_wma_critical_freqs[25];
143
extern const uint16_t ff_wma_hgain_huffcodes[37];
144
extern const uint8_t ff_wma_hgain_huffbits[37];
145
extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
146
extern const uint32_t ff_aac_scalefactor_code[121];
147
extern const uint8_t  ff_aac_scalefactor_bits[121];
148

    
149
int av_cold ff_wma_get_frame_len_bits(int sample_rate, int version,
150
                                      unsigned int decode_flags);
151
int ff_wma_init(AVCodecContext * avctx, int flags2);
152
int ff_wma_total_gain_to_bits(int total_gain);
153
int ff_wma_end(AVCodecContext *avctx);
154
unsigned int ff_wma_get_large_val(GetBitContext* gb);
155
int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
156
                            VLC *vlc,
157
                            const float *level_table, const uint16_t *run_table,
158
                            int version, WMACoef *ptr, int offset,
159
                            int num_coefs, int block_len, int frame_len_bits,
160
                            int coef_nb_bits);
161

    
162
#endif /* AVCODEC_WMA_H */