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 "libavutil/mem_internal.h" 27 28#include "avcodec.h" 29#include "fft.h" 30#include "get_bits.h" 31#include "put_bits.h" 32 33/* size of blocks */ 34#define BLOCK_MIN_BITS 7 35#define BLOCK_MAX_BITS 11 36#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS) 37 38#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1) 39 40/* XXX: find exact max size */ 41#define HIGH_BAND_MAX_SIZE 16 42 43#define NB_LSP_COEFS 10 44 45/* XXX: is it a suitable value ? */ 46#define MAX_CODED_SUPERFRAME_SIZE 32768 47 48#define MAX_CHANNELS 2 49 50#define NOISE_TAB_SIZE 8192 51 52#define LSP_POW_BITS 7 53 54// FIXME should be in wmadec 55#define VLCBITS 9 56#define VLCMAX ((22 + VLCBITS - 1) / VLCBITS) 57 58typedef float WMACoef; ///< type for decoded coefficients, int16_t would be enough for wma 1/2 59 60typedef struct CoefVLCTable { 61 int n; ///< total number of codes 62 int max_level; 63 const uint32_t *huffcodes; ///< VLC bit values 64 const uint8_t *huffbits; ///< VLC bit size 65 const uint16_t *levels; ///< table to build run/level tables 66} CoefVLCTable; 67 68typedef struct WMACodecContext { 69 AVCodecContext *avctx; 70 GetBitContext gb; 71 PutBitContext pb; 72 int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) 73 int use_bit_reservoir; 74 int use_variable_block_len; 75 int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta 76 int use_noise_coding; ///< true if perceptual noise is added 77 int byte_offset_bits; 78 VLC exp_vlc; 79 int exponent_sizes[BLOCK_NB_SIZES]; 80 uint16_t exponent_bands[BLOCK_NB_SIZES][25]; 81 int high_band_start[BLOCK_NB_SIZES]; ///< index of first coef in high band 82 int coefs_start; ///< first coded coef 83 int coefs_end[BLOCK_NB_SIZES]; ///< max number of coded coefficients 84 int exponent_high_sizes[BLOCK_NB_SIZES]; 85 int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE]; 86 VLC hgain_vlc; 87 88 /* coded values in high bands */ 89 int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; 90 int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; 91 92 /* there are two possible tables for spectral coefficients */ 93// FIXME the following 3 tables should be shared between decoders 94 VLC coef_vlc[2]; 95 uint16_t *run_table[2]; 96 float *level_table[2]; 97 uint16_t *int_table[2]; 98 const CoefVLCTable *coef_vlcs[2]; 99 /* frame info */ 100 int frame_len; ///< frame length in samples 101 int frame_len_bits; ///< frame_len = 1 << frame_len_bits 102 int nb_block_sizes; ///< number of block sizes 103 /* block info */ 104 int reset_block_lengths; 105 int block_len_bits; ///< log2 of current block length 106 int next_block_len_bits; ///< log2 of next block length 107 int prev_block_len_bits; ///< log2 of prev block length 108 int block_len; ///< block length in samples 109 int block_num; ///< block number in current frame 110 int block_pos; ///< current position in frame 111 uint8_t ms_stereo; ///< true if mid/side stereo mode 112 uint8_t channel_coded[MAX_CHANNELS]; ///< true if channel is coded 113 int exponents_bsize[MAX_CHANNELS]; ///< log2 ratio frame/exp. length 114 DECLARE_ALIGNED(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE]; 115 float max_exponent[MAX_CHANNELS]; 116 WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; 117 DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE]; 118 DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2]; 119 FFTContext mdct_ctx[BLOCK_NB_SIZES]; 120 const float *windows[BLOCK_NB_SIZES]; 121 /* output buffer for one frame and the last for IMDCT windowing */ 122 DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2]; 123 /* last frame info */ 124 uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; /* padding added */ 125 int last_bitoffset; 126 int last_superframe_len; 127 int exponents_initialized[MAX_CHANNELS]; 128 float noise_table[NOISE_TAB_SIZE]; 129 int noise_index; 130 float noise_mult; /* XXX: suppress that and integrate it in the noise array */ 131 /* lsp_to_curve tables */ 132 float lsp_cos_table[BLOCK_MAX_SIZE]; 133 float lsp_pow_e_table[256]; 134 float lsp_pow_m_table1[(1 << LSP_POW_BITS)]; 135 float lsp_pow_m_table2[(1 << LSP_POW_BITS)]; 136 AVFloatDSPContext *fdsp; 137 138 int eof_done; /* decode flag to output remaining samples after EOF */ 139 140#ifdef TRACE 141 int frame_count; 142#endif /* TRACE */ 143} WMACodecContext; 144 145extern const uint8_t ff_wma_hgain_hufftab[37][2]; 146extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16]; 147extern const uint32_t ff_aac_scalefactor_code[121]; 148extern const uint8_t ff_aac_scalefactor_bits[121]; 149 150av_warn_unused_result 151int ff_wma_init(AVCodecContext *avctx, int flags2); 152 153int ff_wma_total_gain_to_bits(int total_gain); 154int ff_wma_end(AVCodecContext *avctx); 155unsigned int ff_wma_get_large_val(GetBitContext *gb); 156int ff_wma_run_level_decode(AVCodecContext *avctx, GetBitContext *gb, 157 VLC *vlc, const float *level_table, 158 const uint16_t *run_table, int version, 159 WMACoef *ptr, int offset, int num_coefs, 160 int block_len, int frame_len_bits, 161 int coef_nb_bits); 162 163#endif /* AVCODEC_WMA_H */ 164