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#include "fft.h"
29
30/* size of blocks */
31#define BLOCK_MIN_BITS 7
32#define BLOCK_MAX_BITS 11
33#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
34
35#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
36
37/* XXX: find exact max size */
38#define HIGH_BAND_MAX_SIZE 16
39
40#define NB_LSP_COEFS 10
41
42/* XXX: is it a suitable value ? */
43#define MAX_CODED_SUPERFRAME_SIZE 16384
44
45#define MAX_CHANNELS 2
46
47#define NOISE_TAB_SIZE 8192
48
49#define LSP_POW_BITS 7
50
51//FIXME should be in wmadec
52#define VLCBITS 9
53#define VLCMAX ((22+VLCBITS-1)/VLCBITS)
54
55typedef float WMACoef;          ///< type for decoded coefficients, int16_t would be enough for wma 1/2
56
57typedef struct CoefVLCTable {
58    int n;                      ///< total number of codes
59    int max_level;
60    const uint32_t *huffcodes;  ///< VLC bit values
61    const uint8_t *huffbits;    ///< VLC bit size
62    const uint16_t *levels;     ///< table to build run/level tables
63} CoefVLCTable;
64
65typedef struct WMACodecContext {
66    AVCodecContext* avctx;
67    GetBitContext gb;
68    PutBitContext pb;
69    int sample_rate;
70    int nb_channels;
71    int bit_rate;
72    int version;                            ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
73    int block_align;
74    int use_bit_reservoir;
75    int use_variable_block_len;
76    int use_exp_vlc;                        ///< exponent coding: 0 = lsp, 1 = vlc + delta
77    int use_noise_coding;                   ///< true if perceptual noise is added
78    int byte_offset_bits;
79    VLC exp_vlc;
80    int exponent_sizes[BLOCK_NB_SIZES];
81    uint16_t exponent_bands[BLOCK_NB_SIZES][25];
82    int high_band_start[BLOCK_NB_SIZES];    ///< index of first coef in high band
83    int coefs_start;                        ///< first coded coef
84    int coefs_end[BLOCK_NB_SIZES];          ///< max number of coded coefficients
85    int exponent_high_sizes[BLOCK_NB_SIZES];
86    int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
87    VLC hgain_vlc;
88
89    /* coded values in high bands */
90    int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
91    int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
92
93    /* there are two possible tables for spectral coefficients */
94//FIXME the following 3 tables should be shared between decoders
95    VLC coef_vlc[2];
96    uint16_t *run_table[2];
97    float *level_table[2];
98    uint16_t *int_table[2];
99    const CoefVLCTable *coef_vlcs[2];
100    /* frame info */
101    int frame_len;                          ///< frame length in samples
102    int frame_len_bits;                     ///< frame_len = 1 << frame_len_bits
103    int nb_block_sizes;                     ///< number of block sizes
104    /* block info */
105    int reset_block_lengths;
106    int block_len_bits;                     ///< log2 of current block length
107    int next_block_len_bits;                ///< log2 of next block length
108    int prev_block_len_bits;                ///< log2 of prev block length
109    int block_len;                          ///< block length in samples
110    int block_num;                          ///< block number in current frame
111    int block_pos;                          ///< current position in frame
112    uint8_t ms_stereo;                      ///< true if mid/side stereo mode
113    uint8_t channel_coded[MAX_CHANNELS];    ///< true if channel is coded
114    int exponents_bsize[MAX_CHANNELS];      ///< log2 ratio frame/exp. length
115    DECLARE_ALIGNED(16, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
116    float max_exponent[MAX_CHANNELS];
117    WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
118    DECLARE_ALIGNED(16, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
119    DECLARE_ALIGNED(16, FFTSample, output)[BLOCK_MAX_SIZE * 2];
120    FFTContext mdct_ctx[BLOCK_NB_SIZES];
121    float *windows[BLOCK_NB_SIZES];
122    /* output buffer for one frame and the last for IMDCT windowing */
123    DECLARE_ALIGNED(16, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
124    /* last frame info */
125    uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
126    int last_bitoffset;
127    int last_superframe_len;
128    float noise_table[NOISE_TAB_SIZE];
129    int noise_index;
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)];
136    DSPContext dsp;
137
138#ifdef TRACE
139    int frame_count;
140#endif
141} WMACodecContext;
142
143extern const uint16_t ff_wma_critical_freqs[25];
144extern const uint16_t ff_wma_hgain_huffcodes[37];
145extern const uint8_t ff_wma_hgain_huffbits[37];
146extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
147extern const uint32_t ff_aac_scalefactor_code[121];
148extern const uint8_t  ff_aac_scalefactor_bits[121];
149
150int av_cold ff_wma_get_frame_len_bits(int sample_rate, int version,
151                                      unsigned int decode_flags);
152int ff_wma_init(AVCodecContext * avctx, int flags2);
153int ff_wma_total_gain_to_bits(int total_gain);
154int ff_wma_end(AVCodecContext *avctx);
155unsigned int ff_wma_get_large_val(GetBitContext* gb);
156int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
157                            VLC *vlc,
158                            const float *level_table, const uint16_t *run_table,
159                            int version, WMACoef *ptr, int offset,
160                            int num_coefs, int block_len, int frame_len_bits,
161                            int coef_nb_bits);
162
163#endif /* AVCODEC_WMA_H */
164