Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / wma.h
CommitLineData
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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
27#include "fft.h"
28#include "fmtconvert.h"
29#include "get_bits.h"
30#include "put_bits.h"
31
32/* size of blocks */
33#define BLOCK_MIN_BITS 7
34#define BLOCK_MAX_BITS 11
35#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
36
37#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
38
39/* XXX: find exact max size */
40#define HIGH_BAND_MAX_SIZE 16
41
42#define NB_LSP_COEFS 10
43
44/* XXX: is it a suitable value ? */
45#define MAX_CODED_SUPERFRAME_SIZE 16384
46
47#define MAX_CHANNELS 2
48
49#define NOISE_TAB_SIZE 8192
50
51#define LSP_POW_BITS 7
52
53// FIXME should be in wmadec
54#define VLCBITS 9
55#define VLCMAX ((22 + VLCBITS - 1) / VLCBITS)
56
57typedef float WMACoef; ///< type for decoded coefficients, int16_t would be enough for wma 1/2
58
59typedef struct CoefVLCTable {
60 int n; ///< total number of codes
61 int max_level;
62 const uint32_t *huffcodes; ///< VLC bit values
63 const uint8_t *huffbits; ///< VLC bit size
64 const uint16_t *levels; ///< table to build run/level tables
65} CoefVLCTable;
66
67typedef struct WMACodecContext {
68 AVCodecContext *avctx;
69 GetBitContext gb;
70 PutBitContext pb;
71 int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
72 int use_bit_reservoir;
73 int use_variable_block_len;
74 int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta
75 int use_noise_coding; ///< true if perceptual noise is added
76 int byte_offset_bits;
77 VLC exp_vlc;
78 int exponent_sizes[BLOCK_NB_SIZES];
79 uint16_t exponent_bands[BLOCK_NB_SIZES][25];
80 int high_band_start[BLOCK_NB_SIZES]; ///< index of first coef in high band
81 int coefs_start; ///< first coded coef
82 int coefs_end[BLOCK_NB_SIZES]; ///< max number of coded coefficients
83 int exponent_high_sizes[BLOCK_NB_SIZES];
84 int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
85 VLC hgain_vlc;
86
87 /* coded values in high bands */
88 int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
89 int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
90
91 /* there are two possible tables for spectral coefficients */
92// FIXME the following 3 tables should be shared between decoders
93 VLC coef_vlc[2];
94 uint16_t *run_table[2];
95 float *level_table[2];
96 uint16_t *int_table[2];
97 const CoefVLCTable *coef_vlcs[2];
98 /* frame info */
99 int frame_len; ///< frame length in samples
100 int frame_len_bits; ///< frame_len = 1 << frame_len_bits
101 int nb_block_sizes; ///< number of block sizes
102 /* block info */
103 int reset_block_lengths;
104 int block_len_bits; ///< log2 of current block length
105 int next_block_len_bits; ///< log2 of next block length
106 int prev_block_len_bits; ///< log2 of prev block length
107 int block_len; ///< block length in samples
108 int block_num; ///< block number in current frame
109 int block_pos; ///< current position in frame
110 uint8_t ms_stereo; ///< true if mid/side stereo mode
111 uint8_t channel_coded[MAX_CHANNELS]; ///< true if channel is coded
112 int exponents_bsize[MAX_CHANNELS]; ///< log2 ratio frame/exp. length
113 DECLARE_ALIGNED(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
114 float max_exponent[MAX_CHANNELS];
115 WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
116 DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
117 DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2];
118 FFTContext mdct_ctx[BLOCK_NB_SIZES];
119 const float *windows[BLOCK_NB_SIZES];
120 /* output buffer for one frame and the last for IMDCT windowing */
121 DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
122 /* last frame info */
123 uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; /* padding added */
124 int last_bitoffset;
125 int last_superframe_len;
126 float noise_table[NOISE_TAB_SIZE];
127 int noise_index;
128 float noise_mult; /* XXX: suppress that and integrate it in the noise array */
129 /* lsp_to_curve tables */
130 float lsp_cos_table[BLOCK_MAX_SIZE];
131 float lsp_pow_e_table[256];
132 float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
133 float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
134 FmtConvertContext fmt_conv;
f6fa7814 135 AVFloatDSPContext *fdsp;
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136
137#ifdef TRACE
138 int frame_count;
139#endif /* TRACE */
140} WMACodecContext;
141
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, const float *level_table,
154 const uint16_t *run_table, int version,
155 WMACoef *ptr, int offset, int num_coefs,
156 int block_len, int frame_len_bits,
157 int coef_nb_bits);
158
159#endif /* AVCODEC_WMA_H */