wma.h
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1 /*
2  * WMA compatible codec
3  * Copyright (c) 2002-2007 The Libav Project
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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 #include "fft.h"
29 #include "fmtconvert.h"
30 
31 /* size of blocks */
32 #define BLOCK_MIN_BITS 7
33 #define BLOCK_MAX_BITS 11
34 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
35 
36 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
37 
38 /* XXX: find exact max size */
39 #define HIGH_BAND_MAX_SIZE 16
40 
41 #define NB_LSP_COEFS 10
42 
43 /* XXX: is it a suitable value ? */
44 #define MAX_CODED_SUPERFRAME_SIZE 16384
45 
46 #define MAX_CHANNELS 2
47 
48 #define NOISE_TAB_SIZE 8192
49 
50 #define LSP_POW_BITS 7
51 
52 //FIXME should be in wmadec
53 #define VLCBITS 9
54 #define VLCMAX ((22+VLCBITS-1)/VLCBITS)
55 
56 typedef float WMACoef;
57 
58 typedef struct CoefVLCTable {
59  int n;
60  int max_level;
61  const uint32_t *huffcodes;
62  const uint8_t *huffbits;
63  const uint16_t *levels;
64 } CoefVLCTable;
65 
66 typedef struct WMACodecContext {
73  int bit_rate;
74  int version;
90 
91  /* coded values in high bands */
94 
95  /* there are two possible tables for spectral coefficients */
96 //FIXME the following 3 tables should be shared between decoders
98  uint16_t *run_table[2];
99  float *level_table[2];
100  uint16_t *int_table[2];
102  /* frame info */
103  int frame_len;
106  /* block info */
111  int block_len;
112  int block_num;
113  int block_pos;
114  uint8_t ms_stereo;
124  /* output buffer for one frame and the last for IMDCT windowing */
126  /* last frame info */
132  float noise_mult; /* XXX: suppress that and integrate it in the noise array */
133  /* lsp_to_curve tables */
135  float lsp_pow_e_table[256];
140 
141 #ifdef TRACE
142  int frame_count;
143 #endif
145 
146 extern const uint16_t ff_wma_critical_freqs[25];
147 extern const uint16_t ff_wma_hgain_huffcodes[37];
148 extern const uint8_t ff_wma_hgain_huffbits[37];
149 extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
150 extern const uint32_t ff_aac_scalefactor_code[121];
151 extern const uint8_t ff_aac_scalefactor_bits[121];
152 
153 int av_cold ff_wma_get_frame_len_bits(int sample_rate, int version,
154  unsigned int decode_flags);
155 int ff_wma_init(AVCodecContext * avctx, int flags2);
156 int ff_wma_total_gain_to_bits(int total_gain);
157 int ff_wma_end(AVCodecContext *avctx);
158 unsigned int ff_wma_get_large_val(GetBitContext* gb);
160  VLC *vlc,
161  const float *level_table, const uint16_t *run_table,
162  int version, WMACoef *ptr, int offset,
163  int num_coefs, int block_len, int frame_len_bits,
164  int coef_nb_bits);
165 
166 #endif /* AVCODEC_WMA_H */