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