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#include "get_bits.h" 27#include "put_bits.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 GetBitContext gb; 69 PutBitContext pb; 70 int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) 71 int use_bit_reservoir; 72 int use_variable_block_len; 73 int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta 74 int use_noise_coding; ///< true if perceptual noise is added 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]; 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 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]; 94 float *level_table[2]; 95 uint16_t *int_table[2]; 96 const CoefVLCTable *coef_vlcs[2]; 97 /* frame info */ 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 101 /* block info */ 102 int reset_block_lengths; 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 111 int exponents_bsize[MAX_CHANNELS]; ///< log2 ratio frame/exp. length 112 DECLARE_ALIGNED(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE]; 113 float max_exponent[MAX_CHANNELS]; 114 WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; 115 DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE]; 116 DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2]; 117 FFTContext mdct_ctx[BLOCK_NB_SIZES]; 118 float *windows[BLOCK_NB_SIZES]; 119 /* output buffer for one frame and the last for IMDCT windowing */ 120 DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2]; 121 /* last frame info */ 122 uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; /* padding added */ 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)]; 133 FmtConvertContext fmt_conv; 134 AVFloatDSPContext fdsp; 135 136#ifdef TRACE 137 int frame_count; 138#endif 139} WMACodecContext; 140 141extern const uint16_t ff_wma_critical_freqs[25]; 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, 154 const float *level_table, const uint16_t *run_table, 155 int version, WMACoef *ptr, int offset, 156 int num_coefs, int block_len, int frame_len_bits, 157 int coef_nb_bits); 158 159#endif /* AVCODEC_WMA_H */ 160