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 "bitstream.h"
26#include "dsputil.h"
27
28/* size of blocks */
29#define BLOCK_MIN_BITS 7
30#define BLOCK_MAX_BITS 11
31#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
32
33#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
34
35/* XXX: find exact max size */
36#define HIGH_BAND_MAX_SIZE 16
37
38#define NB_LSP_COEFS 10
39
40/* XXX: is it a suitable value ? */
41#define MAX_CODED_SUPERFRAME_SIZE 16384
42
43#define MAX_CHANNELS 2
44
45#define NOISE_TAB_SIZE 8192
46
47#define LSP_POW_BITS 7
48
49//FIXME should be in wmadec
50#define VLCBITS 9
51#define VLCMAX ((22+VLCBITS-1)/VLCBITS)
52
53typedef struct CoefVLCTable {
54    int n;                      ///< total number of codes
55    int max_level;
56    const uint32_t *huffcodes;  ///< VLC bit values
57    const uint8_t *huffbits;    ///< VLC bit size
58    const uint16_t *levels;     ///< table to build run/level tables
59} CoefVLCTable;
60
61typedef struct WMACodecContext {
62    AVCodecContext* avctx;
63    GetBitContext gb;
64    PutBitContext pb;
65    int sample_rate;
66    int nb_channels;
67    int bit_rate;
68    int version;                            ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
69    int block_align;
70    int use_bit_reservoir;
71    int use_variable_block_len;
72    int use_exp_vlc;                        ///< exponent coding: 0 = lsp, 1 = vlc + delta
73    int use_noise_coding;                   ///< true if perceptual noise is added
74    int byte_offset_bits;
75    VLC exp_vlc;
76    int exponent_sizes[BLOCK_NB_SIZES];
77    uint16_t exponent_bands[BLOCK_NB_SIZES][25];
78    int high_band_start[BLOCK_NB_SIZES];    ///< index of first coef in high band
79    int coefs_start;                        ///< first coded coef
80    int coefs_end[BLOCK_NB_SIZES];          ///< max number of coded coefficients
81    int exponent_high_sizes[BLOCK_NB_SIZES];
82    int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
83    VLC hgain_vlc;
84
85    /* coded values in high bands */
86    int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
87    int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
88
89    /* there are two possible tables for spectral coefficients */
90//FIXME the following 3 tables should be shared between decoders
91    VLC coef_vlc[2];
92    uint16_t *run_table[2];
93    uint16_t *level_table[2];
94    uint16_t *int_table[2];
95    const CoefVLCTable *coef_vlcs[2];
96    /* frame info */
97    int frame_len;                          ///< frame length in samples
98    int frame_len_bits;                     ///< frame_len = 1 << frame_len_bits
99    int nb_block_sizes;                     ///< number of block sizes
100    /* block info */
101    int reset_block_lengths;
102    int block_len_bits;                     ///< log2 of current block length
103    int next_block_len_bits;                ///< log2 of next block length
104    int prev_block_len_bits;                ///< log2 of prev block length
105    int block_len;                          ///< block length in samples
106    int block_num;                          ///< block number in current frame
107    int block_pos;                          ///< current position in frame
108    uint8_t ms_stereo;                      ///< true if mid/side stereo mode
109    uint8_t channel_coded[MAX_CHANNELS];    ///< true if channel is coded
110    int exponents_bsize[MAX_CHANNELS];      ///< log2 ratio frame/exp. length
111    DECLARE_ALIGNED_16(float, exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]);
112    float max_exponent[MAX_CHANNELS];
113    int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
114    DECLARE_ALIGNED_16(float, coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]);
115    DECLARE_ALIGNED_16(FFTSample, output[BLOCK_MAX_SIZE * 2]);
116    MDCTContext mdct_ctx[BLOCK_NB_SIZES];
117    float *windows[BLOCK_NB_SIZES];
118    /* output buffer for one frame and the last for IMDCT windowing */
119    DECLARE_ALIGNED_16(float, frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2]);
120    /* last frame info */
121    uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
122    int last_bitoffset;
123    int last_superframe_len;
124    float noise_table[NOISE_TAB_SIZE];
125    int noise_index;
126    float noise_mult; /* XXX: suppress that and integrate it in the noise array */
127    /* lsp_to_curve tables */
128    float lsp_cos_table[BLOCK_MAX_SIZE];
129    float lsp_pow_e_table[256];
130    float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
131    float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
132    DSPContext dsp;
133
134#ifdef TRACE
135    int frame_count;
136#endif
137} WMACodecContext;
138
139extern const uint16_t ff_wma_hgain_huffcodes[37];
140extern const uint8_t ff_wma_hgain_huffbits[37];
141extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
142extern const uint32_t ff_wma_scale_huffcodes[121];
143extern const uint8_t ff_wma_scale_huffbits[121];
144
145int ff_wma_init(AVCodecContext * avctx, int flags2);
146int ff_wma_total_gain_to_bits(int total_gain);
147int ff_wma_end(AVCodecContext *avctx);
148
149#endif /* AVCODEC_WMA_H */
150