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
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    AVFrame frame;
69    GetBitContext gb;
70    PutBitContext pb;
71    int sample_rate;
72    int nb_channels;
73    int bit_rate;
74    int version;                            ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
75    int block_align;
76    int use_bit_reservoir;
77    int use_variable_block_len;
78    int use_exp_vlc;                        ///< exponent coding: 0 = lsp, 1 = vlc + delta
79    int use_noise_coding;                   ///< true if perceptual noise is added
80    int byte_offset_bits;
81    VLC exp_vlc;
82    int exponent_sizes[BLOCK_NB_SIZES];
83    uint16_t exponent_bands[BLOCK_NB_SIZES][25];
84    int high_band_start[BLOCK_NB_SIZES];    ///< index of first coef in high band
85    int coefs_start;                        ///< first coded coef
86    int coefs_end[BLOCK_NB_SIZES];          ///< max number of coded coefficients
87    int exponent_high_sizes[BLOCK_NB_SIZES];
88    int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
89    VLC hgain_vlc;
90
91    /* coded values in high bands */
92    int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
93    int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
94
95    /* there are two possible tables for spectral coefficients */
96//FIXME the following 3 tables should be shared between decoders
97    VLC coef_vlc[2];
98    uint16_t *run_table[2];
99    float *level_table[2];
100    uint16_t *int_table[2];
101    const CoefVLCTable *coef_vlcs[2];
102    /* frame info */
103    int frame_len;                          ///< frame length in samples
104    int frame_len_bits;                     ///< frame_len = 1 << frame_len_bits
105    int nb_block_sizes;                     ///< number of block sizes
106    /* block info */
107    int reset_block_lengths;
108    int block_len_bits;                     ///< log2 of current block length
109    int next_block_len_bits;                ///< log2 of next block length
110    int prev_block_len_bits;                ///< log2 of prev block length
111    int block_len;                          ///< block length in samples
112    int block_num;                          ///< block number in current frame
113    int block_pos;                          ///< current position in frame
114    uint8_t ms_stereo;                      ///< true if mid/side stereo mode
115    uint8_t channel_coded[MAX_CHANNELS];    ///< true if channel is coded
116    int exponents_bsize[MAX_CHANNELS];      ///< log2 ratio frame/exp. length
117    DECLARE_ALIGNED(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
118    float max_exponent[MAX_CHANNELS];
119    WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
120    DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
121    DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2];
122    FFTContext mdct_ctx[BLOCK_NB_SIZES];
123    float *windows[BLOCK_NB_SIZES];
124    /* output buffer for one frame and the last for IMDCT windowing */
125    DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
126    /* last frame info */
127    uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; /* padding added */
128    int last_bitoffset;
129    int last_superframe_len;
130    float noise_table[NOISE_TAB_SIZE];
131    int noise_index;
132    float noise_mult; /* XXX: suppress that and integrate it in the noise array */
133    /* lsp_to_curve tables */
134    float lsp_cos_table[BLOCK_MAX_SIZE];
135    float lsp_pow_e_table[256];
136    float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
137    float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
138    DSPContext dsp;
139    FmtConvertContext fmt_conv;
140
141#ifdef TRACE
142    int frame_count;
143#endif
144} WMACodecContext;
145
146extern const uint16_t ff_wma_critical_freqs[25];
147extern const uint16_t ff_wma_hgain_huffcodes[37];
148extern const uint8_t ff_wma_hgain_huffbits[37];
149extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
150extern const uint32_t ff_aac_scalefactor_code[121];
151extern const uint8_t  ff_aac_scalefactor_bits[121];
152
153int av_cold ff_wma_get_frame_len_bits(int sample_rate, int version,
154                                      unsigned int decode_flags);
155int ff_wma_init(AVCodecContext * avctx, int flags2);
156int ff_wma_total_gain_to_bits(int total_gain);
157int ff_wma_end(AVCodecContext *avctx);
158unsigned int ff_wma_get_large_val(GetBitContext* gb);
159int ff_wma_run_level_decode(AVCodecContext* avctx, 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 */
167