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/libavcodec/wma.h

http://github.com/FFmpeg/FFmpeg
C Header | 161 lines | 107 code | 22 blank | 32 comment | 0 complexity | 510c38a7457cc2e1a068fcc96f2011c0 MD5 | raw file
  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 "avcodec.h"
 28#include "fft.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 32768
 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
 57typedef float WMACoef;          ///< type for decoded coefficients, int16_t would be enough for wma 1/2
 58
 59typedef 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
 67typedef 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 + AV_INPUT_BUFFER_PADDING_SIZE]; /* padding added */
124    int last_bitoffset;
125    int last_superframe_len;
126    int exponents_initialized[MAX_CHANNELS];
127    float noise_table[NOISE_TAB_SIZE];
128    int noise_index;
129    float noise_mult; /* XXX: suppress that and integrate it in the noise array */
130    /* lsp_to_curve tables */
131    float lsp_cos_table[BLOCK_MAX_SIZE];
132    float lsp_pow_e_table[256];
133    float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
134    float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
135    AVFloatDSPContext *fdsp;
136
137#ifdef TRACE
138    int frame_count;
139#endif /* TRACE */
140} WMACodecContext;
141
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
148av_warn_unused_result
149int ff_wma_init(AVCodecContext *avctx, int flags2);
150
151int ff_wma_total_gain_to_bits(int total_gain);
152int ff_wma_end(AVCodecContext *avctx);
153unsigned int ff_wma_get_large_val(GetBitContext *gb);
154int ff_wma_run_level_decode(AVCodecContext *avctx, GetBitContext *gb,
155                            VLC *vlc, const float *level_table,
156                            const uint16_t *run_table, int version,
157                            WMACoef *ptr, int offset, int num_coefs,
158                            int block_len, int frame_len_bits,
159                            int coef_nb_bits);
160
161#endif /* AVCODEC_WMA_H */