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 "bitstream.h"
29 #define BLOCK_MIN_BITS 7
30 #define BLOCK_MAX_BITS 11
31 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
33 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
35 /* XXX: find exact max size */
36 #define HIGH_BAND_MAX_SIZE 16
38 #define NB_LSP_COEFS 10
40 /* XXX: is it a suitable value ? */
41 #define MAX_CODED_SUPERFRAME_SIZE 16384
43 #define MAX_CHANNELS 2
45 #define NOISE_TAB_SIZE 8192
47 #define LSP_POW_BITS 7
49 //FIXME should be in wmadec
51 #define VLCMAX ((22+VLCBITS-1)/VLCBITS)
53 typedef struct CoefVLCTable {
54 int n; ///< total number of codes
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
61 typedef struct WMADecodeContext {
67 int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
69 int use_bit_reservoir;
70 int use_variable_block_len;
71 int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta
72 int use_noise_coding; ///< true if perceptual noise is added
75 int exponent_sizes[BLOCK_NB_SIZES];
76 uint16_t exponent_bands[BLOCK_NB_SIZES][25];
77 int high_band_start[BLOCK_NB_SIZES]; ///< index of first coef in high band
78 int coefs_start; ///< first coded coef
79 int coefs_end[BLOCK_NB_SIZES]; ///< max number of coded coefficients
80 int exponent_high_sizes[BLOCK_NB_SIZES];
81 int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
84 /* coded values in high bands */
85 int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
86 int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
88 /* there are two possible tables for spectral coefficients */
89 //FIXME the following 3 tables should be shared between decoders
91 uint16_t *run_table[2];
92 uint16_t *level_table[2];
93 uint16_t *int_table[2];
94 CoefVLCTable *coef_vlcs[2];
96 int frame_len; ///< frame length in samples
97 int frame_len_bits; ///< frame_len = 1 << frame_len_bits
98 int nb_block_sizes; ///< number of block sizes
100 int reset_block_lengths;
101 int block_len_bits; ///< log2 of current block length
102 int next_block_len_bits; ///< log2 of next block length
103 int prev_block_len_bits; ///< log2 of prev block length
104 int block_len; ///< block length in samples
105 int block_num; ///< block number in current frame
106 int block_pos; ///< current position in frame
107 uint8_t ms_stereo; ///< true if mid/side stereo mode
108 uint8_t channel_coded[MAX_CHANNELS]; ///< true if channel is coded
109 DECLARE_ALIGNED_16(float, exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]);
110 float max_exponent[MAX_CHANNELS];
111 int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
112 DECLARE_ALIGNED_16(float, coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]);
113 DECLARE_ALIGNED_16(FFTSample, output[BLOCK_MAX_SIZE * 2]);
114 DECLARE_ALIGNED_16(float, window[BLOCK_MAX_SIZE * 2]);
115 MDCTContext mdct_ctx[BLOCK_NB_SIZES];
116 float *windows[BLOCK_NB_SIZES];
117 DECLARE_ALIGNED_16(FFTSample, mdct_tmp[BLOCK_MAX_SIZE]); ///< temporary storage for imdct
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 */
123 int last_superframe_len;
124 float noise_table[NOISE_TAB_SIZE];
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)];
139 extern const uint16_t ff_wma_hgain_huffcodes[37];
140 extern const uint8_t ff_wma_hgain_huffbits[37];
141 extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
142 extern const uint32_t ff_wma_scale_huffcodes[121];
143 extern const uint8_t ff_wma_scale_huffbits[121];
145 int ff_wma_init(AVCodecContext * avctx, int flags2);
146 int ff_wma_total_gain_to_bits(int total_gain);
147 int ff_wma_end(AVCodecContext *avctx);