ismindex: recover from completely empty streams
[libav.git] / libavcodec / wma.h
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1/*
2 * WMA compatible codec
2912e87a 3 * Copyright (c) 2002-2007 The Libav Project
59686073 4 *
2912e87a 5 * This file is part of Libav.
59686073 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
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22#ifndef AVCODEC_WMA_H
23#define AVCODEC_WMA_H
59686073 24
31b2262d 25#include "libavutil/float_dsp.h"
9106a698 26#include "get_bits.h"
b2755007 27#include "put_bits.h"
1429224b 28#include "fft.h"
c73d99e6 29#include "fmtconvert.h"
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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
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56typedef float WMACoef; ///< type for decoded coefficients, int16_t would be enough for wma 1/2
57
59686073 58typedef struct CoefVLCTable {
6836af52 59 int n; ///< total number of codes
59686073 60 int max_level;
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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
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64} CoefVLCTable;
65
911b9faf 66typedef struct WMACodecContext {
a9c9a240 67 AVCodecContext* avctx;
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68 GetBitContext gb;
69 PutBitContext pb;
6836af52 70 int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
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71 int use_bit_reservoir;
72 int use_variable_block_len;
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73 int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta
74 int use_noise_coding; ///< true if perceptual noise is added
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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];
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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
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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];
076a9dea 94 float *level_table[2];
59686073 95 uint16_t *int_table[2];
6785cae3 96 const CoefVLCTable *coef_vlcs[2];
59686073 97 /* frame info */
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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
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101 /* block info */
102 int reset_block_lengths;
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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
5bd526d9 111 int exponents_bsize[MAX_CHANNELS]; ///< log2 ratio frame/exp. length
9d35fa52 112 DECLARE_ALIGNED(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
59686073 113 float max_exponent[MAX_CHANNELS];
9970c61b 114 WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
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115 DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
116 DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2];
01b22147 117 FFTContext mdct_ctx[BLOCK_NB_SIZES];
59686073 118 float *windows[BLOCK_NB_SIZES];
59686073 119 /* output buffer for one frame and the last for IMDCT windowing */
9d35fa52 120 DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
59686073 121 /* last frame info */
349b7977 122 uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; /* padding added */
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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)];
c73d99e6 133 FmtConvertContext fmt_conv;
31b2262d 134 AVFloatDSPContext fdsp;
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135
136#ifdef TRACE
137 int frame_count;
138#endif
911b9faf 139} WMACodecContext;
59686073 140
a7e6328c 141extern const uint16_t ff_wma_critical_freqs[25];
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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];
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145extern const uint32_t ff_aac_scalefactor_code[121];
146extern const uint8_t ff_aac_scalefactor_bits[121];
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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);
891bd2e5 151unsigned int ff_wma_get_large_val(GetBitContext* gb);
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152int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
153 VLC *vlc,
076a9dea 154 const float *level_table, const uint16_t *run_table,
9970c61b 155 int version, WMACoef *ptr, int offset,
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156 int num_coefs, int block_len, int frame_len_bits,
157 int coef_nb_bits);
59686073 158
98790382 159#endif /* AVCODEC_WMA_H */