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wma.h
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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 "libavutil/float_dsp.h"
26 
27 #include "avcodec.h"
28 #include "fft.h"
29 #include "get_bits.h"
30 #include "put_bits.h"
31 
32 /* size of blocks */
33 #define BLOCK_MIN_BITS 7
34 #define BLOCK_MAX_BITS 11
35 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
36 
37 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
38 
39 /* XXX: find exact max size */
40 #define HIGH_BAND_MAX_SIZE 16
41 
42 #define NB_LSP_COEFS 10
43 
44 /* XXX: is it a suitable value ? */
45 #define MAX_CODED_SUPERFRAME_SIZE 32768
46 
47 #define MAX_CHANNELS 2
48 
49 #define NOISE_TAB_SIZE 8192
50 
51 #define LSP_POW_BITS 7
52 
53 // FIXME should be in wmadec
54 #define VLCBITS 9
55 #define VLCMAX ((22 + VLCBITS - 1) / VLCBITS)
56 
57 typedef float WMACoef; ///< type for decoded coefficients, int16_t would be enough for wma 1/2
58 
59 typedef struct CoefVLCTable {
60  int n; ///< total number of codes
61  int max_level;
62  const uint32_t *huffcodes; ///< VLC bit values
63  const uint8_t *huffbits; ///< VLC bit size
64  const uint16_t *levels; ///< table to build run/level tables
65 } CoefVLCTable;
66 
67 typedef struct WMACodecContext {
71  int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
74  int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta
75  int use_noise_coding; ///< true if perceptual noise is added
80  int high_band_start[BLOCK_NB_SIZES]; ///< index of first coef in high band
81  int coefs_start; ///< first coded coef
82  int coefs_end[BLOCK_NB_SIZES]; ///< max number of coded coefficients
86 
87  /* coded values in high bands */
90 
91  /* there are two possible tables for spectral coefficients */
92 // FIXME the following 3 tables should be shared between decoders
94  uint16_t *run_table[2];
95  float *level_table[2];
96  uint16_t *int_table[2];
98  /* frame info */
99  int frame_len; ///< frame length in samples
100  int frame_len_bits; ///< frame_len = 1 << frame_len_bits
101  int nb_block_sizes; ///< number of block sizes
102  /* block info */
104  int block_len_bits; ///< log2 of current block length
105  int next_block_len_bits; ///< log2 of next block length
106  int prev_block_len_bits; ///< log2 of prev block length
107  int block_len; ///< block length in samples
108  int block_num; ///< block number in current frame
109  int block_pos; ///< current position in frame
110  uint8_t ms_stereo; ///< true if mid/side stereo mode
111  uint8_t channel_coded[MAX_CHANNELS]; ///< true if channel is coded
112  int exponents_bsize[MAX_CHANNELS]; ///< log2 ratio frame/exp. length
119  const float *windows[BLOCK_NB_SIZES];
120  /* output buffer for one frame and the last for IMDCT windowing */
122  /* last frame info */
128  float noise_mult; /* XXX: suppress that and integrate it in the noise array */
129  /* lsp_to_curve tables */
131  float lsp_pow_e_table[256];
135 
136 #ifdef TRACE
137  int frame_count;
138 #endif /* TRACE */
140 
141 extern const uint16_t ff_wma_hgain_huffcodes[37];
142 extern const uint8_t ff_wma_hgain_huffbits[37];
143 extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
144 extern const uint32_t ff_aac_scalefactor_code[121];
145 extern const uint8_t ff_aac_scalefactor_bits[121];
146 
148 int ff_wma_init(AVCodecContext *avctx, int flags2);
149 
150 int ff_wma_total_gain_to_bits(int total_gain);
151 int ff_wma_end(AVCodecContext *avctx);
152 unsigned int ff_wma_get_large_val(GetBitContext *gb);
154  VLC *vlc, const float *level_table,
155  const uint16_t *run_table, int version,
156  WMACoef *ptr, int offset, int num_coefs,
157  int block_len, int frame_len_bits,
158  int coef_nb_bits);
159 
160 #endif /* AVCODEC_WMA_H */
int next_block_len_bits
log2 of next block length
Definition: wma.h:105
#define BLOCK_MAX_SIZE
Definition: wma.h:35
unsigned int ff_wma_get_large_val(GetBitContext *gb)
Decode an uncompressed coefficient.
Definition: wma.c:406
GetBitContext gb
Definition: wma.h:69
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:53
int block_len
block length in samples
Definition: wma.h:107
int ff_wma_run_level_decode(AVCodecContext *avctx, GetBitContext *gb, VLC *vlc, const float *level_table, const uint16_t *run_table, int version, WMACoef *ptr, int offset, int num_coefs, int block_len, int frame_len_bits, int coef_nb_bits)
Decode run level compressed coefficients.
Definition: wma.c:438
const uint8_t * huffbits
VLC bit size.
Definition: wma.h:63
int version
Definition: avisynth_c.h:629
float exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]
Definition: wma.h:113
int n
total number of codes
Definition: wma.h:60
#define NOISE_TAB_SIZE
Definition: wma.h:49
#define BLOCK_NB_SIZES
Definition: wma.h:37
float lsp_pow_m_table2[(1<< LSP_POW_BITS)]
Definition: wma.h:133
float lsp_cos_table[BLOCK_MAX_SIZE]
Definition: wma.h:130
int high_band_start[BLOCK_NB_SIZES]
index of first coef in high band
Definition: wma.h:80
int exponent_sizes[BLOCK_NB_SIZES]
Definition: wma.h:78
uint8_t
float WMACoef
type for decoded coefficients, int16_t would be enough for wma 1/2
Definition: wma.h:57
int block_pos
current position in frame
Definition: wma.h:109
const uint32_t * huffcodes
VLC bit values.
Definition: wma.h:62
bitstream reader API header.
int max_level
Definition: wma.h:61
float lsp_pow_m_table1[(1<< LSP_POW_BITS)]
Definition: wma.h:132
int reset_block_lengths
Definition: wma.h:103
int nb_block_sizes
number of block sizes
Definition: wma.h:101
uint16_t * int_table[2]
Definition: wma.h:96
uint16_t exponent_bands[BLOCK_NB_SIZES][25]
Definition: wma.h:79
uint8_t channel_coded[MAX_CHANNELS]
true if channel is coded
Definition: wma.h:111
uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE+AV_INPUT_BUFFER_PADDING_SIZE]
Definition: wma.h:123
int last_superframe_len
Definition: wma.h:125
int ff_wma_total_gain_to_bits(int total_gain)
Definition: wma.c:364
FFTSample output[BLOCK_MAX_SIZE *2]
Definition: wma.h:117
const uint8_t ff_wma_hgain_huffbits[37]
Definition: wmadata.h:62
int noise_index
Definition: wma.h:127
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
float FFTSample
Definition: avfft.h:35
Definition: get_bits.h:63
int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE]
Definition: wma.h:84
int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]
Definition: wma.h:89
AVFloatDSPContext * fdsp
Definition: wma.h:134
Definition: fft.h:88
int use_bit_reservoir
Definition: wma.h:72
#define MAX_CODED_SUPERFRAME_SIZE
Definition: wma.h:45
uint16_t * run_table[2]
Definition: wma.h:94
const uint16_t ff_wma_hgain_huffcodes[37]
Definition: wmadata.h:54
int version
1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
Definition: wma.h:71
int frame_len
frame length in samples
Definition: wma.h:99
#define MAX_CHANNELS
Definition: wma.h:47
int last_bitoffset
Definition: wma.h:124
int frame_len_bits
frame_len = 1 << frame_len_bits
Definition: wma.h:100
Libavcodec external API header.
#define HIGH_BAND_MAX_SIZE
Definition: wma.h:40
int use_exp_vlc
exponent coding: 0 = lsp, 1 = vlc + delta
Definition: wma.h:74
VLC coef_vlc[2]
Definition: wma.h:93
#define NB_LSP_COEFS
Definition: wma.h:42
main external API structure.
Definition: avcodec.h:1642
AVCodecContext * avctx
Definition: wma.h:68
float frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE *2]
Definition: wma.h:121
int exponent_high_sizes[BLOCK_NB_SIZES]
Definition: wma.h:83
int block_num
block number in current frame
Definition: wma.h:108
int use_noise_coding
true if perceptual noise is added
Definition: wma.h:75
float * level_table[2]
Definition: wma.h:95
#define LSP_POW_BITS
Definition: wma.h:51
int use_variable_block_len
Definition: wma.h:73
uint8_t ms_stereo
true if mid/side stereo mode
Definition: wma.h:110
FFTContext mdct_ctx[BLOCK_NB_SIZES]
Definition: wma.h:118
VLC exp_vlc
Definition: wma.h:77
int exponents_bsize[MAX_CHANNELS]
log2 ratio frame/exp. length
Definition: wma.h:112
float coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]
Definition: wma.h:116
#define av_warn_unused_result
Definition: attributes.h:56
int prev_block_len_bits
log2 of prev block length
Definition: wma.h:106
int coefs_end[BLOCK_NB_SIZES]
max number of coded coefficients
Definition: wma.h:82
float lsp_pow_e_table[256]
Definition: wma.h:131
const float ff_wma_lsp_codebook[NB_LSP_COEFS][16]
Definition: wmadata.h:68
av_warn_unused_result int ff_wma_init(AVCodecContext *avctx, int flags2)
Definition: wma.c:81
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:728
WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]
Definition: wma.h:115
const uint8_t ff_aac_scalefactor_bits[121]
Definition: aactab.c:82
float max_exponent[MAX_CHANNELS]
Definition: wma.h:114
const uint32_t ff_aac_scalefactor_code[121]
Definition: aactab.c:63
int ff_wma_end(AVCodecContext *avctx)
Definition: wma.c:378
VLC hgain_vlc
Definition: wma.h:85
int coefs_start
first coded coef
Definition: wma.h:81
int block_len_bits
log2 of current block length
Definition: wma.h:104
int byte_offset_bits
Definition: wma.h:76
int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]
Definition: wma.h:88
const CoefVLCTable * coef_vlcs[2]
Definition: wma.h:97
PutBitContext pb
Definition: wma.h:70
float noise_table[NOISE_TAB_SIZE]
Definition: wma.h:126
const uint16_t * levels
table to build run/level tables
Definition: wma.h:64
float noise_mult
Definition: wma.h:128
const float * windows[BLOCK_NB_SIZES]
Definition: wma.h:119
bitstream writer API