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 "bitstream.h" 26#include "dsputil.h" 27 28/* size of blocks */ 29#define BLOCK_MIN_BITS 7 30#define BLOCK_MAX_BITS 11 31#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS) 32 33#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1) 34 35/* XXX: find exact max size */ 36#define HIGH_BAND_MAX_SIZE 16 37 38#define NB_LSP_COEFS 10 39 40/* XXX: is it a suitable value ? */ 41#define MAX_CODED_SUPERFRAME_SIZE 16384 42 43#define MAX_CHANNELS 2 44 45#define NOISE_TAB_SIZE 8192 46 47#define LSP_POW_BITS 7 48 49//FIXME should be in wmadec 50#define VLCBITS 9 51#define VLCMAX ((22+VLCBITS-1)/VLCBITS) 52 53typedef struct CoefVLCTable { 54 int n; ///< total number of codes 55 int max_level; 56 const uint32_t *huffcodes; ///< VLC bit values 57 const uint8_t *huffbits; ///< VLC bit size 58 const uint16_t *levels; ///< table to build run/level tables 59} CoefVLCTable; 60 61typedef struct WMACodecContext { 62 AVCodecContext* avctx; 63 GetBitContext gb; 64 PutBitContext pb; 65 int sample_rate; 66 int nb_channels; 67 int bit_rate; 68 int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) 69 int block_align; 70 int use_bit_reservoir; 71 int use_variable_block_len; 72 int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta 73 int use_noise_coding; ///< true if perceptual noise is added 74 int byte_offset_bits; 75 VLC exp_vlc; 76 int exponent_sizes[BLOCK_NB_SIZES]; 77 uint16_t exponent_bands[BLOCK_NB_SIZES][25]; 78 int high_band_start[BLOCK_NB_SIZES]; ///< index of first coef in high band 79 int coefs_start; ///< first coded coef 80 int coefs_end[BLOCK_NB_SIZES]; ///< max number of coded coefficients 81 int exponent_high_sizes[BLOCK_NB_SIZES]; 82 int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE]; 83 VLC hgain_vlc; 84 85 /* coded values in high bands */ 86 int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; 87 int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; 88 89 /* there are two possible tables for spectral coefficients */ 90//FIXME the following 3 tables should be shared between decoders 91 VLC coef_vlc[2]; 92 uint16_t *run_table[2]; 93 uint16_t *level_table[2]; 94 uint16_t *int_table[2]; 95 const CoefVLCTable *coef_vlcs[2]; 96 /* frame info */ 97 int frame_len; ///< frame length in samples 98 int frame_len_bits; ///< frame_len = 1 << frame_len_bits 99 int nb_block_sizes; ///< number of block sizes 100 /* block info */ 101 int reset_block_lengths; 102 int block_len_bits; ///< log2 of current block length 103 int next_block_len_bits; ///< log2 of next block length 104 int prev_block_len_bits; ///< log2 of prev block length 105 int block_len; ///< block length in samples 106 int block_num; ///< block number in current frame 107 int block_pos; ///< current position in frame 108 uint8_t ms_stereo; ///< true if mid/side stereo mode 109 uint8_t channel_coded[MAX_CHANNELS]; ///< true if channel is coded 110 int exponents_bsize[MAX_CHANNELS]; ///< log2 ratio frame/exp. length 111 DECLARE_ALIGNED_16(float, exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]); 112 float max_exponent[MAX_CHANNELS]; 113 int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; 114 DECLARE_ALIGNED_16(float, coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]); 115 DECLARE_ALIGNED_16(FFTSample, output[BLOCK_MAX_SIZE * 2]); 116 MDCTContext mdct_ctx[BLOCK_NB_SIZES]; 117 float *windows[BLOCK_NB_SIZES]; 118 /* output buffer for one frame and the last for IMDCT windowing */ 119 DECLARE_ALIGNED_16(float, frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2]); 120 /* last frame info */ 121 uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */ 122 int last_bitoffset; 123 int last_superframe_len; 124 float noise_table[NOISE_TAB_SIZE]; 125 int noise_index; 126 float noise_mult; /* XXX: suppress that and integrate it in the noise array */ 127 /* lsp_to_curve tables */ 128 float lsp_cos_table[BLOCK_MAX_SIZE]; 129 float lsp_pow_e_table[256]; 130 float lsp_pow_m_table1[(1 << LSP_POW_BITS)]; 131 float lsp_pow_m_table2[(1 << LSP_POW_BITS)]; 132 DSPContext dsp; 133 134#ifdef TRACE 135 int frame_count; 136#endif 137} WMACodecContext; 138 139extern const uint16_t ff_wma_hgain_huffcodes[37]; 140extern const uint8_t ff_wma_hgain_huffbits[37]; 141extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16]; 142extern const uint32_t ff_wma_scale_huffcodes[121]; 143extern const uint8_t ff_wma_scale_huffbits[121]; 144 145int ff_wma_init(AVCodecContext * avctx, int flags2); 146int ff_wma_total_gain_to_bits(int total_gain); 147int ff_wma_end(AVCodecContext *avctx); 148 149#endif /* AVCODEC_WMA_H */ 150