FFmpeg
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 #include "libavutil/mem_internal.h"
27 
28 #include "avcodec.h"
29 #include "fft.h"
30 #include "get_bits.h"
31 #include "put_bits.h"
32 
33 /* size of blocks */
34 #define BLOCK_MIN_BITS 7
35 #define BLOCK_MAX_BITS 11
36 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
37 
38 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
39 
40 /* XXX: find exact max size */
41 #define HIGH_BAND_MAX_SIZE 16
42 
43 #define NB_LSP_COEFS 10
44 
45 /* XXX: is it a suitable value ? */
46 #define MAX_CODED_SUPERFRAME_SIZE 32768
47 
48 #define MAX_CHANNELS 2
49 
50 #define NOISE_TAB_SIZE 8192
51 
52 #define LSP_POW_BITS 7
53 
54 // FIXME should be in wmadec
55 #define VLCBITS 9
56 #define VLCMAX ((22 + VLCBITS - 1) / VLCBITS)
57 
58 typedef float WMACoef; ///< type for decoded coefficients, int16_t would be enough for wma 1/2
59 
60 typedef struct CoefVLCTable {
61  int n; ///< total number of codes
62  int max_level;
63  const uint32_t *huffcodes; ///< VLC bit values
64  const uint8_t *huffbits; ///< VLC bit size
65  const uint16_t *levels; ///< table to build run/level tables
66 } CoefVLCTable;
67 
68 typedef struct WMACodecContext {
72  int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
75  int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta
76  int use_noise_coding; ///< true if perceptual noise is added
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];
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
95  uint16_t *run_table[2];
96  float *level_table[2];
97  uint16_t *int_table[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 */
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(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
115  float max_exponent[MAX_CHANNELS];
120  const float *windows[BLOCK_NB_SIZES];
121  /* output buffer for one frame and the last for IMDCT windowing */
122  DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
123  /* last frame info */
124  uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; /* padding added */
127  int exponents_initialized[MAX_CHANNELS];
130  float noise_mult; /* XXX: suppress that and integrate it in the noise array */
131  /* lsp_to_curve tables */
132  float lsp_cos_table[BLOCK_MAX_SIZE];
133  float lsp_pow_e_table[256];
134  float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
135  float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
137 
138 #ifdef TRACE
139  int frame_count;
140 #endif /* TRACE */
142 
143 extern const uint8_t ff_wma_hgain_hufftab[37][2];
144 extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
145 extern const uint32_t ff_aac_scalefactor_code[121];
146 extern const uint8_t ff_aac_scalefactor_bits[121];
147 
149 int ff_wma_init(AVCodecContext *avctx, int flags2);
150 
151 int ff_wma_total_gain_to_bits(int total_gain);
152 int ff_wma_end(AVCodecContext *avctx);
153 unsigned int ff_wma_get_large_val(GetBitContext *gb);
155  VLC *vlc, const float *level_table,
156  const uint16_t *run_table, int version,
157  WMACoef *ptr, int offset, int num_coefs,
158  int block_len, int frame_len_bits,
159  int coef_nb_bits);
160 
161 #endif /* AVCODEC_WMA_H */
version
Definition: libkvazaar.c:320
int next_block_len_bits
log2 of next block length
Definition: wma.h:106
#define BLOCK_MAX_SIZE
Definition: wma.h:36
unsigned int ff_wma_get_large_val(GetBitContext *gb)
Decode an uncompressed coefficient.
Definition: wma.c:392
GetBitContext gb
Definition: wma.h:70
int block_len
block length in samples
Definition: wma.h:108
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:424
const uint8_t ff_wma_hgain_hufftab[37][2]
Definition: wmadata.h:54
const uint8_t * huffbits
VLC bit size.
Definition: wma.h:64
int n
total number of codes
Definition: wma.h:61
#define NOISE_TAB_SIZE
Definition: wma.h:50
#define BLOCK_NB_SIZES
Definition: wma.h:38
uint8_t
float WMACoef
type for decoded coefficients, int16_t would be enough for wma 1/2
Definition: wma.h:58
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
int block_pos
current position in frame
Definition: wma.h:110
const uint32_t * huffcodes
VLC bit values.
Definition: wma.h:63
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:117
bitstream reader API header.
int max_level
Definition: wma.h:62
int reset_block_lengths
Definition: wma.h:104
int nb_block_sizes
number of block sizes
Definition: wma.h:102
int last_superframe_len
Definition: wma.h:126
int ff_wma_total_gain_to_bits(int total_gain)
Definition: wma.c:350
int noise_index
Definition: wma.h:129
float FFTSample
Definition: avfft.h:35
Definition: vlc.h:26
AVFloatDSPContext * fdsp
Definition: wma.h:136
Definition: fft.h:83
int use_bit_reservoir
Definition: wma.h:73
#define MAX_CODED_SUPERFRAME_SIZE
Definition: wma.h:46
int version
1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
Definition: wma.h:72
static const int8_t noise_table[256]
Data table used for TrueHD noise generation function.
Definition: mlpdec.c:997
int frame_len
frame length in samples
Definition: wma.h:100
#define MAX_CHANNELS
Definition: wma.h:48
int last_bitoffset
Definition: wma.h:125
int frame_len_bits
frame_len = 1 << frame_len_bits
Definition: wma.h:101
Libavcodec external API header.
#define HIGH_BAND_MAX_SIZE
Definition: wma.h:41
int use_exp_vlc
exponent coding: 0 = lsp, 1 = vlc + delta
Definition: wma.h:75
#define NB_LSP_COEFS
Definition: wma.h:43
main external API structure.
Definition: avcodec.h:531
AVCodecContext * avctx
Definition: wma.h:69
static VLC coef_vlc[2]
coefficient run length vlc codes
Definition: wmaprodec.c:135
int block_num
block number in current frame
Definition: wma.h:109
int use_noise_coding
true if perceptual noise is added
Definition: wma.h:76
#define LSP_POW_BITS
Definition: wma.h:52
int use_variable_block_len
Definition: wma.h:74
uint8_t ms_stereo
true if mid/side stereo mode
Definition: wma.h:111
VLC exp_vlc
Definition: wma.h:78
#define av_warn_unused_result
Definition: attributes.h:62
int prev_block_len_bits
log2 of prev block length
Definition: wma.h:107
const float ff_wma_lsp_codebook[NB_LSP_COEFS][16]
Definition: wmadata.h:64
av_warn_unused_result int ff_wma_init(AVCodecContext *avctx, int flags2)
Definition: wma.c:77
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:215
const uint8_t ff_aac_scalefactor_bits[121]
Definition: aactab.c:111
static const CoefVLCTable coef_vlcs[6]
Definition: wmadata.h:1371
const uint32_t ff_aac_scalefactor_code[121]
Definition: aactab.c:92
int ff_wma_end(AVCodecContext *avctx)
Definition: wma.c:364
VLC hgain_vlc
Definition: wma.h:86
int coefs_start
first coded coef
Definition: wma.h:82
int block_len_bits
log2 of current block length
Definition: wma.h:105
int byte_offset_bits
Definition: wma.h:77
PutBitContext pb
Definition: wma.h:71
const uint16_t * levels
table to build run/level tables
Definition: wma.h:65
float noise_mult
Definition: wma.h:130
bitstream writer API