Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / sbr.h
1 /*
2 * Spectral Band Replication definitions and structures
3 * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
4 * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * Spectral Band Replication definitions and structures
26 * @author Robert Swain ( rob opendot cl )
27 */
28
29 #ifndef AVCODEC_SBR_H
30 #define AVCODEC_SBR_H
31
32 #include <stdint.h>
33 #include "fft.h"
34 #include "aacps.h"
35 #include "sbrdsp.h"
36
37 typedef struct AACContext AACContext;
38
39 /**
40 * Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header.
41 */
42 typedef struct SpectrumParameters {
43 uint8_t bs_start_freq;
44 uint8_t bs_stop_freq;
45 uint8_t bs_xover_band;
46
47 /**
48 * @name Variables associated with bs_header_extra_1
49 * @{
50 */
51 uint8_t bs_freq_scale;
52 uint8_t bs_alter_scale;
53 uint8_t bs_noise_bands;
54 /** @} */
55 } SpectrumParameters;
56
57 #define SBR_SYNTHESIS_BUF_SIZE ((1280-128)*2)
58
59 /**
60 * Spectral Band Replication per channel data
61 */
62 typedef struct SBRData {
63 /**
64 * @name Main bitstream data variables
65 * @{
66 */
67 unsigned bs_frame_class;
68 unsigned bs_add_harmonic_flag;
69 unsigned bs_num_env;
70 uint8_t bs_freq_res[7];
71 unsigned bs_num_noise;
72 uint8_t bs_df_env[5];
73 uint8_t bs_df_noise[2];
74 uint8_t bs_invf_mode[2][5];
75 uint8_t bs_add_harmonic[48];
76 unsigned bs_amp_res;
77 /** @} */
78
79 /**
80 * @name State variables
81 * @{
82 */
83 DECLARE_ALIGNED(32, float, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE];
84 DECLARE_ALIGNED(32, float, analysis_filterbank_samples) [1312];
85 int synthesis_filterbank_samples_offset;
86 ///l_APrev and l_A
87 int e_a[2];
88 ///Chirp factors
89 float bw_array[5];
90 ///QMF values of the original signal
91 float W[2][32][32][2];
92 ///QMF output of the HF adjustor
93 int Ypos;
94 DECLARE_ALIGNED(16, float, Y)[2][38][64][2];
95 DECLARE_ALIGNED(16, float, g_temp)[42][48];
96 float q_temp[42][48];
97 uint8_t s_indexmapped[8][48];
98 ///Envelope scalefactors
99 float env_facs[6][48];
100 ///Noise scalefactors
101 float noise_facs[3][5];
102 ///Envelope time borders
103 uint8_t t_env[8];
104 ///Envelope time border of the last envelope of the previous frame
105 uint8_t t_env_num_env_old;
106 ///Noise time borders
107 uint8_t t_q[3];
108 unsigned f_indexnoise;
109 unsigned f_indexsine;
110 /** @} */
111 } SBRData;
112
113 typedef struct SpectralBandReplication SpectralBandReplication;
114
115 /**
116 * aacsbr functions pointers
117 */
118 typedef struct AACSBRContext {
119 int (*sbr_lf_gen)(AACContext *ac, SpectralBandReplication *sbr,
120 float X_low[32][40][2], const float W[2][32][32][2],
121 int buf_idx);
122 void (*sbr_hf_assemble)(float Y1[38][64][2],
123 const float X_high[64][40][2],
124 SpectralBandReplication *sbr, SBRData *ch_data,
125 const int e_a[2]);
126 int (*sbr_x_gen)(SpectralBandReplication *sbr, float X[2][38][64],
127 const float Y0[38][64][2], const float Y1[38][64][2],
128 const float X_low[32][40][2], int ch);
129 void (*sbr_hf_inverse_filter)(SBRDSPContext *dsp,
130 float (*alpha0)[2], float (*alpha1)[2],
131 const float X_low[32][40][2], int k0);
132 } AACSBRContext;
133
134 /**
135 * Spectral Band Replication
136 */
137 struct SpectralBandReplication {
138 int sample_rate;
139 int start;
140 int reset;
141 SpectrumParameters spectrum_params;
142 int bs_amp_res_header;
143 /**
144 * @name Variables associated with bs_header_extra_2
145 * @{
146 */
147 unsigned bs_limiter_bands;
148 unsigned bs_limiter_gains;
149 unsigned bs_interpol_freq;
150 unsigned bs_smoothing_mode;
151 /** @} */
152 unsigned bs_coupling;
153 unsigned k[5]; ///< k0, k1, k2
154 ///kx', and kx respectively, kx is the first QMF subband where SBR is used.
155 ///kx' is its value from the previous frame
156 unsigned kx[2];
157 ///M' and M respectively, M is the number of QMF subbands that use SBR.
158 unsigned m[2];
159 unsigned kx_and_m_pushed;
160 ///The number of frequency bands in f_master
161 unsigned n_master;
162 SBRData data[2];
163 PSContext ps;
164 ///N_Low and N_High respectively, the number of frequency bands for low and high resolution
165 unsigned n[2];
166 ///Number of noise floor bands
167 unsigned n_q;
168 ///Number of limiter bands
169 unsigned n_lim;
170 ///The master QMF frequency grouping
171 uint16_t f_master[49];
172 ///Frequency borders for low resolution SBR
173 uint16_t f_tablelow[25];
174 ///Frequency borders for high resolution SBR
175 uint16_t f_tablehigh[49];
176 ///Frequency borders for noise floors
177 uint16_t f_tablenoise[6];
178 ///Frequency borders for the limiter
179 uint16_t f_tablelim[30];
180 unsigned num_patches;
181 uint8_t patch_num_subbands[6];
182 uint8_t patch_start_subband[6];
183 ///QMF low frequency input to the HF generator
184 DECLARE_ALIGNED(16, float, X_low)[32][40][2];
185 ///QMF output of the HF generator
186 DECLARE_ALIGNED(16, float, X_high)[64][40][2];
187 ///QMF values of the reconstructed signal
188 DECLARE_ALIGNED(16, float, X)[2][2][38][64];
189 ///Zeroth coefficient used to filter the subband signals
190 DECLARE_ALIGNED(16, float, alpha0)[64][2];
191 ///First coefficient used to filter the subband signals
192 DECLARE_ALIGNED(16, float, alpha1)[64][2];
193 ///Dequantized envelope scalefactors, remapped
194 float e_origmapped[7][48];
195 ///Dequantized noise scalefactors, remapped
196 float q_mapped[7][48];
197 ///Sinusoidal presence, remapped
198 uint8_t s_mapped[7][48];
199 ///Estimated envelope
200 float e_curr[7][48];
201 ///Amplitude adjusted noise scalefactors
202 float q_m[7][48];
203 ///Sinusoidal levels
204 float s_m[7][48];
205 float gain[7][48];
206 DECLARE_ALIGNED(32, float, qmf_filter_scratch)[5][64];
207 FFTContext mdct_ana;
208 FFTContext mdct;
209 SBRDSPContext dsp;
210 AACSBRContext c;
211 };
212
213 #endif /* AVCODEC_SBR_H */