| 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 */ |