3 * Copyright (c) 2002-2007 The FFmpeg Project
5 * This file is part of FFmpeg.
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.
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.
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
25 #include "libavutil/float_dsp.h"
32 #define BLOCK_MIN_BITS 7
33 #define BLOCK_MAX_BITS 11
34 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
36 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
38 /* XXX: find exact max size */
39 #define HIGH_BAND_MAX_SIZE 16
41 #define NB_LSP_COEFS 10
43 /* XXX: is it a suitable value ? */
44 #define MAX_CODED_SUPERFRAME_SIZE 32768
46 #define MAX_CHANNELS 2
48 #define NOISE_TAB_SIZE 8192
50 #define LSP_POW_BITS 7
52 // FIXME should be in wmadec
54 #define VLCMAX ((22 + VLCBITS - 1) / VLCBITS)
56 typedef float WMACoef; ///< type for decoded coefficients, int16_t would be enough for wma 1/2
58 typedef struct CoefVLCTable {
59 int n; ///< total number of codes
61 const uint32_t *huffcodes; ///< VLC bit values
62 const uint8_t *huffbits; ///< VLC bit size
63 const uint16_t *levels; ///< table to build run/level tables
66 typedef struct WMACodecContext {
67 AVCodecContext *avctx;
70 int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
71 int use_bit_reservoir;
72 int use_variable_block_len;
73 int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta
74 int use_noise_coding; ///< true if perceptual noise is added
77 int exponent_sizes[BLOCK_NB_SIZES];
78 uint16_t exponent_bands[BLOCK_NB_SIZES][25];
79 int high_band_start[BLOCK_NB_SIZES]; ///< index of first coef in high band
80 int coefs_start; ///< first coded coef
81 int coefs_end[BLOCK_NB_SIZES]; ///< max number of coded coefficients
82 int exponent_high_sizes[BLOCK_NB_SIZES];
83 int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
86 /* coded values in high bands */
87 int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
88 int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
90 /* there are two possible tables for spectral coefficients */
91 // FIXME the following 3 tables should be shared between decoders
93 uint16_t *run_table[2];
94 float *level_table[2];
95 uint16_t *int_table[2];
96 const CoefVLCTable *coef_vlcs[2];
98 int frame_len; ///< frame length in samples
99 int frame_len_bits; ///< frame_len = 1 << frame_len_bits
100 int nb_block_sizes; ///< number of block sizes
102 int reset_block_lengths;
103 int block_len_bits; ///< log2 of current block length
104 int next_block_len_bits; ///< log2 of next block length
105 int prev_block_len_bits; ///< log2 of prev block length
106 int block_len; ///< block length in samples
107 int block_num; ///< block number in current frame
108 int block_pos; ///< current position in frame
109 uint8_t ms_stereo; ///< true if mid/side stereo mode
110 uint8_t channel_coded[MAX_CHANNELS]; ///< true if channel is coded
111 int exponents_bsize[MAX_CHANNELS]; ///< log2 ratio frame/exp. length
112 DECLARE_ALIGNED(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
113 float max_exponent[MAX_CHANNELS];
114 WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
115 DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
116 DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2];
117 FFTContext mdct_ctx[BLOCK_NB_SIZES];
118 const float *windows[BLOCK_NB_SIZES];
119 /* output buffer for one frame and the last for IMDCT windowing */
120 DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
121 /* last frame info */
122 uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; /* padding added */
124 int last_superframe_len;
125 float noise_table[NOISE_TAB_SIZE];
127 float noise_mult; /* XXX: suppress that and integrate it in the noise array */
128 /* lsp_to_curve tables */
129 float lsp_cos_table[BLOCK_MAX_SIZE];
130 float lsp_pow_e_table[256];
131 float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
132 float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
133 AVFloatDSPContext *fdsp;
140 extern const uint16_t ff_wma_hgain_huffcodes[37];
141 extern const uint8_t ff_wma_hgain_huffbits[37];
142 extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
143 extern const uint32_t ff_aac_scalefactor_code[121];
144 extern const uint8_t ff_aac_scalefactor_bits[121];
146 int ff_wma_init(AVCodecContext *avctx, int flags2);
147 int ff_wma_total_gain_to_bits(int total_gain);
148 int ff_wma_end(AVCodecContext *avctx);
149 unsigned int ff_wma_get_large_val(GetBitContext *gb);
150 int ff_wma_run_level_decode(AVCodecContext *avctx, GetBitContext *gb,
151 VLC *vlc, const float *level_table,
152 const uint16_t *run_table, int version,
153 WMACoef *ptr, int offset, int num_coefs,
154 int block_len, int frame_len_bits,
157 #endif /* AVCODEC_WMA_H */