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>
6 * This file is part of Libav.
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25 * Spectral Band Replication definitions and structures
26 * @author Robert Swain ( rob opendot cl )
38 * Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header.
41 uint8_t bs_start_freq;
43 uint8_t bs_xover_band;
46 * @name Variables associated with bs_header_extra_1
49 uint8_t bs_freq_scale;
50 uint8_t bs_alter_scale;
51 uint8_t bs_noise_bands;
55 #define SBR_SYNTHESIS_BUF_SIZE ((1280-128)*2)
58 * Spectral Band Replication per channel data
62 * @name Main bitstream data variables
65 unsigned bs_frame_class;
66 unsigned bs_add_harmonic_flag;
68 uint8_t bs_freq_res[7];
69 unsigned bs_num_noise;
71 uint8_t bs_df_noise[2];
72 uint8_t bs_invf_mode[2][5];
73 uint8_t bs_add_harmonic[48];
78 * @name State variables
81 DECLARE_ALIGNED(16, float, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE];
82 DECLARE_ALIGNED(16, float, analysis_filterbank_samples) [1312];
83 int synthesis_filterbank_samples_offset;
88 ///QMF values of the original signal
89 float W[2][32][32][2];
90 ///QMF output of the HF adjustor
92 DECLARE_ALIGNED(16, float, Y)[2][38][64][2];
93 DECLARE_ALIGNED(16, float, g_temp)[42][48];
95 uint8_t s_indexmapped[8][48];
96 ///Envelope scalefactors
97 float env_facs[6][48];
99 float noise_facs[3][5];
100 ///Envelope time borders
102 ///Envelope time border of the last envelope of the previous frame
103 uint8_t t_env_num_env_old;
104 ///Noise time borders
106 unsigned f_indexnoise;
107 unsigned f_indexsine;
112 * Spectral Band Replication
118 SpectrumParameters spectrum_params;
119 int bs_amp_res_header;
121 * @name Variables associated with bs_header_extra_2
124 unsigned bs_limiter_bands;
125 unsigned bs_limiter_gains;
126 unsigned bs_interpol_freq;
127 unsigned bs_smoothing_mode;
129 unsigned bs_coupling;
130 unsigned k[5]; ///< k0, k1, k2
131 ///kx', and kx respectively, kx is the first QMF subband where SBR is used.
132 ///kx' is its value from the previous frame
134 ///M' and M respectively, M is the number of QMF subbands that use SBR.
136 unsigned kx_and_m_pushed;
137 ///The number of frequency bands in f_master
141 ///N_Low and N_High respectively, the number of frequency bands for low and high resolution
143 ///Number of noise floor bands
145 ///Number of limiter bands
147 ///The master QMF frequency grouping
148 uint16_t f_master[49];
149 ///Frequency borders for low resolution SBR
150 uint16_t f_tablelow[25];
151 ///Frequency borders for high resolution SBR
152 uint16_t f_tablehigh[49];
153 ///Frequency borders for noise floors
154 uint16_t f_tablenoise[6];
155 ///Frequency borders for the limiter
156 uint16_t f_tablelim[29];
157 unsigned num_patches;
158 uint8_t patch_num_subbands[6];
159 uint8_t patch_start_subband[6];
160 ///QMF low frequency input to the HF generator
161 DECLARE_ALIGNED(16, float, X_low)[32][40][2];
162 ///QMF output of the HF generator
163 DECLARE_ALIGNED(16, float, X_high)[64][40][2];
164 ///QMF values of the reconstructed signal
165 DECLARE_ALIGNED(16, float, X)[2][2][38][64];
166 ///Zeroth coefficient used to filter the subband signals
167 DECLARE_ALIGNED(16, float, alpha0)[64][2];
168 ///First coefficient used to filter the subband signals
169 DECLARE_ALIGNED(16, float, alpha1)[64][2];
170 ///Dequantized envelope scalefactors, remapped
171 float e_origmapped[7][48];
172 ///Dequantized noise scalefactors, remapped
173 float q_mapped[7][48];
174 ///Sinusoidal presence, remapped
175 uint8_t s_mapped[7][48];
176 ///Estimated envelope
178 ///Amplitude adjusted noise scalefactors
183 DECLARE_ALIGNED(32, float, qmf_filter_scratch)[5][64];
187 } SpectralBandReplication;
189 #endif /* AVCODEC_SBR_H */