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 57 typedef float WMACoef; ///< type for decoded coefficients, int16_t would be enough for wma 1/2 58 59 typedef 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 67 typedef 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; 135 AVFloatDSPContext fdsp; 136 137 #ifdef TRACE 138 int frame_count; 139 #endif /* TRACE */ 140 } WMACodecContext; 141 142 extern const uint16_t ff_wma_hgain_huffcodes[37]; 143 extern const uint8_t ff_wma_hgain_huffbits[37]; 144 extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16]; 145 extern const uint32_t ff_aac_scalefactor_code[121]; 146 extern const uint8_t ff_aac_scalefactor_bits[121]; 147 148 int ff_wma_init(AVCodecContext *avctx, int flags2); 149 int ff_wma_total_gain_to_bits(int total_gain); 150 int ff_wma_end(AVCodecContext *avctx); 151 unsigned int ff_wma_get_large_val(GetBitContext *gb); 152 int 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 */ 160