apps/codecs/libwmapro/wma.h

   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 "get_bits.h"
  26 #include "put_bits.h"
  27 #include "dsputil.h"
  28 #include "fft.h"
  29
  30 /* size of blocks */
  31 #define BLOCK_MIN_BITS 7
  32 #define BLOCK_MAX_BITS 11
  33 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
  34
  35 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
  36
  37 /* XXX: find exact max size */
  38 #define HIGH_BAND_MAX_SIZE 16
  39
  40 #define NB_LSP_COEFS 10
  41
  42 /* XXX: is it a suitable value ? */
  43 #define MAX_CODED_SUPERFRAME_SIZE 16384
  44
  45 #define MAX_CHANNELS 2
  46
  47 #define NOISE_TAB_SIZE 8192
  48
  49 #define LSP_POW_BITS 7
  50
  51 //FIXME should be in wmadec
  52 #define VLCBITS 9
  53 #define VLCMAX ((22+VLCBITS-1)/VLCBITS)
  54
  55 typedef float WMACoef;          ///< type for decoded coefficients, int16_t would be enough for wma 1/2
  56
  57 typedef struct CoefVLCTable {
  58     int n;                      ///< total number of codes
  59     int max_level;
  60     const uint32_t *huffcodes;  ///< VLC bit values
  61     const uint8_t *huffbits;    ///< VLC bit size
  62     const uint16_t *levels;     ///< table to build run/level tables
  63 } CoefVLCTable;
  64
  65 typedef struct WMACodecContext {
  66     AVCodecContext* avctx;
  67     GetBitContext gb;
  68     PutBitContext pb;
  69     int sample_rate;
  70     int nb_channels;
  71     int bit_rate;
  72     int version;                            ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
  73     int block_align;
  74     int use_bit_reservoir;
  75     int use_variable_block_len;
  76     int use_exp_vlc;                        ///< exponent coding: 0 = lsp, 1 = vlc + delta
  77     int use_noise_coding;                   ///< true if perceptual noise is added
  78     int byte_offset_bits;
  79     VLC exp_vlc;
  80     int exponent_sizes[BLOCK_NB_SIZES];
  81     uint16_t exponent_bands[BLOCK_NB_SIZES][25];
  82     int high_band_start[BLOCK_NB_SIZES];    ///< index of first coef in high band
  83     int coefs_start;                        ///< first coded coef
  84     int coefs_end[BLOCK_NB_SIZES];          ///< max number of coded coefficients
  85     int exponent_high_sizes[BLOCK_NB_SIZES];
  86     int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
  87     VLC hgain_vlc;
  88
  89     /* coded values in high bands */
  90     int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  91     int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  92
  93     /* there are two possible tables for spectral coefficients */
  94 //FIXME the following 3 tables should be shared between decoders
  95     VLC coef_vlc[2];
  96     uint16_t *run_table[2];
  97     float *level_table[2];
  98     uint16_t *int_table[2];
  99     const CoefVLCTable *coef_vlcs[2];
 100     /* frame info */
 101     int frame_len;                          ///< frame length in samples
 102     int frame_len_bits;                     ///< frame_len = 1 << frame_len_bits
 103     int nb_block_sizes;                     ///< number of block sizes
 104     /* block info */
 105     int reset_block_lengths;
 106     int block_len_bits;                     ///< log2 of current block length
 107     int next_block_len_bits;                ///< log2 of next block length
 108     int prev_block_len_bits;                ///< log2 of prev block length
 109     int block_len;                          ///< block length in samples
 110     int block_num;                          ///< block number in current frame
 111     int block_pos;                          ///< current position in frame
 112     uint8_t ms_stereo;                      ///< true if mid/side stereo mode
 113     uint8_t channel_coded[MAX_CHANNELS];    ///< true if channel is coded
 114     int exponents_bsize[MAX_CHANNELS];      ///< log2 ratio frame/exp. length
 115     DECLARE_ALIGNED(16, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
 116     float max_exponent[MAX_CHANNELS];
 117     WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
 118     DECLARE_ALIGNED(16, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
 119     DECLARE_ALIGNED(16, FFTSample, output)[BLOCK_MAX_SIZE * 2];
 120     FFTContext mdct_ctx[BLOCK_NB_SIZES];
 121     float *windows[BLOCK_NB_SIZES];
 122     /* output buffer for one frame and the last for IMDCT windowing */
 123     DECLARE_ALIGNED(16, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
 124     /* last frame info */
 125     uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
 126     int last_bitoffset;
 127     int last_superframe_len;
 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     DSPContext dsp;
 137
 138 #ifdef TRACE
 139     int frame_count;
 140 #endif
 141 } WMACodecContext;
 142
 143 extern const uint16_t ff_wma_critical_freqs[25];
 144 extern const uint16_t ff_wma_hgain_huffcodes[37];
 145 extern const uint8_t ff_wma_hgain_huffbits[37];
 146 extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
 147 extern const uint32_t ff_aac_scalefactor_code[121];
 148 extern const uint8_t  ff_aac_scalefactor_bits[121];
 149
 150 int av_cold ff_wma_get_frame_len_bits(int sample_rate, int version,
 151                                       unsigned int decode_flags);
 152 int ff_wma_init(AVCodecContext * avctx, int flags2);
 153 int ff_wma_total_gain_to_bits(int total_gain);
 154 int ff_wma_end(AVCodecContext *avctx);
 155 unsigned int ff_wma_get_large_val(GetBitContext* gb);
 156 int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
 157                             VLC *vlc,
 158                             const float *level_table, const uint16_t *run_table,
 159                             int version, WMACoef *ptr, int offset,
 160                             int num_coefs, int block_len, int frame_len_bits,
 161                             int coef_nb_bits);
 162
 163 #endif /* AVCODEC_WMA_H */