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 "get_bits.h"
27#include "put_bits.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
56typedef float WMACoef;          ///< type for decoded coefficients, int16_t would be enough for wma 1/2
57
58typedef struct CoefVLCTable {
59    int n;                      ///< total number of codes
60    int max_level;
61    const uint32_t *huffcodes;  ///< VLC bit values
62    const uint8_t *huffbits;    ///< VLC bit size
63    const uint16_t *levels;     ///< table to build run/level tables
64} CoefVLCTable;
65
66typedef struct WMACodecContext {
67    AVCodecContext* avctx;
68    GetBitContext gb;
69    PutBitContext pb;
70    int version;                            ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
71    int use_bit_reservoir;
72    int use_variable_block_len;
73    int use_exp_vlc;                        ///< exponent coding: 0 = lsp, 1 = vlc + delta
74    int use_noise_coding;                   ///< true if perceptual noise is added
75    int byte_offset_bits;
76    VLC exp_vlc;
77    int exponent_sizes[BLOCK_NB_SIZES];
78    uint16_t exponent_bands[BLOCK_NB_SIZES][25];
79    int high_band_start[BLOCK_NB_SIZES];    ///< index of first coef in high band
80    int coefs_start;                        ///< first coded coef
81    int coefs_end[BLOCK_NB_SIZES];          ///< max number of coded coefficients
82    int exponent_high_sizes[BLOCK_NB_SIZES];
83    int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
84    VLC hgain_vlc;
85
86    /* coded values in high bands */
87    int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
88    int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
89
90    /* there are two possible tables for spectral coefficients */
91//FIXME the following 3 tables should be shared between decoders
92    VLC coef_vlc[2];
93    uint16_t *run_table[2];
94    float *level_table[2];
95    uint16_t *int_table[2];
96    const CoefVLCTable *coef_vlcs[2];
97    /* frame info */
98    int frame_len;                          ///< frame length in samples
99    int frame_len_bits;                     ///< frame_len = 1 << frame_len_bits
100    int nb_block_sizes;                     ///< number of block sizes
101    /* block info */
102    int reset_block_lengths;
103    int block_len_bits;                     ///< log2 of current block length
104    int next_block_len_bits;                ///< log2 of next block length
105    int prev_block_len_bits;                ///< log2 of prev block length
106    int block_len;                          ///< block length in samples
107    int block_num;                          ///< block number in current frame
108    int block_pos;                          ///< current position in frame
109    uint8_t ms_stereo;                      ///< true if mid/side stereo mode
110    uint8_t channel_coded[MAX_CHANNELS];    ///< true if channel is coded
111    int exponents_bsize[MAX_CHANNELS];      ///< log2 ratio frame/exp. length
112    DECLARE_ALIGNED(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
113    float max_exponent[MAX_CHANNELS];
114    WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
115    DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
116    DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2];
117    FFTContext mdct_ctx[BLOCK_NB_SIZES];
118    float *windows[BLOCK_NB_SIZES];
119    /* output buffer for one frame and the last for IMDCT windowing */
120    DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
121    /* last frame info */
122    uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; /* padding added */
123    int last_bitoffset;
124    int last_superframe_len;
125    float noise_table[NOISE_TAB_SIZE];
126    int noise_index;
127    float noise_mult; /* XXX: suppress that and integrate it in the noise array */
128    /* lsp_to_curve tables */
129    float lsp_cos_table[BLOCK_MAX_SIZE];
130    float lsp_pow_e_table[256];
131    float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
132    float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
133    FmtConvertContext fmt_conv;
134    AVFloatDSPContext fdsp;
135
136#ifdef TRACE
137    int frame_count;
138#endif
139} WMACodecContext;
140
141extern const uint16_t ff_wma_critical_freqs[25];
142extern const uint16_t ff_wma_hgain_huffcodes[37];
143extern const uint8_t ff_wma_hgain_huffbits[37];
144extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
145extern const uint32_t ff_aac_scalefactor_code[121];
146extern const uint8_t  ff_aac_scalefactor_bits[121];
147
148int ff_wma_init(AVCodecContext * avctx, int flags2);
149int ff_wma_total_gain_to_bits(int total_gain);
150int ff_wma_end(AVCodecContext *avctx);
151unsigned int ff_wma_get_large_val(GetBitContext* gb);
152int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
153                            VLC *vlc,
154                            const float *level_table, const uint16_t *run_table,
155                            int version, WMACoef *ptr, int offset,
156                            int num_coefs, int block_len, int frame_len_bits,
157                            int coef_nb_bits);
158
159#endif /* AVCODEC_WMA_H */
160