2 * Copyright (C) 2016 foo86
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
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17 * License along with FFmpeg; if not, write to the Free Software
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21 #ifndef AVCODEC_DCA_LBR_H
22 #define AVCODEC_DCA_LBR_H
24 #include "libavutil/common.h"
25 #include "libavutil/float_dsp.h"
26 #include "libavutil/mem.h"
36 #define DCA_LBR_CHANNELS 6
37 #define DCA_LBR_CHANNELS_TOTAL 32
38 #define DCA_LBR_SUBBANDS 32
39 #define DCA_LBR_TONES 512
41 #define DCA_LBR_TIME_SAMPLES 128
42 #define DCA_LBR_TIME_HISTORY 8
44 typedef struct DCALbrTone {
45 uint8_t x_freq; ///< Spectral line offset
46 uint8_t f_delt; ///< Difference between original and center frequency
47 uint8_t ph_rot; ///< Phase rotation
48 uint8_t pad; ///< Padding field
49 uint8_t amp[DCA_LBR_CHANNELS]; ///< Per-channel amplitude
50 uint8_t phs[DCA_LBR_CHANNELS]; ///< Per-channel phase
53 typedef struct DCALbrDecoder {
54 AVCodecContext *avctx;
57 int sample_rate; ///< Sample rate of LBR audio
58 int ch_mask; ///< LBR speaker mask
59 int flags; ///< Flags for LBR decoder initialization
60 int bit_rate_orig; ///< Original bit rate
61 int bit_rate_scaled; ///< Scaled bit rate
63 int nchannels; ///< Number of fullband channels to decode
64 int nchannels_total; ///< Total number of fullband channels
65 int freq_range; ///< Frequency range of LBR audio
66 int band_limit; ///< Band limit factor
67 int limited_rate; ///< Band limited sample rate
68 int limited_range; ///< Band limited frequency range
69 int res_profile; ///< Resolution profile
70 int nsubbands; ///< Number of encoded subbands
71 int g3_avg_only_start_sb; ///< Subband index where grid 3 scale factors end
72 int min_mono_subband; ///< Subband index where mono encoding starts
73 int max_mono_subband; ///< Subband index where mono encoding ends
75 int framenum; ///< Lower 5 bits of current frame number
76 int lbr_rand; ///< Seed for subband randomization
77 int warned; ///< Flags for warning suppression
79 uint8_t quant_levels[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS]; ///< Quantization levels
80 uint8_t sb_indices[DCA_LBR_SUBBANDS]; ///< Subband reordering indices
82 uint8_t sec_ch_sbms[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS]; ///< Right channel inversion or mid/side decoding flags
83 uint8_t sec_ch_lrms[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS]; ///< Flags indicating if left/right channel are swapped
84 uint32_t ch_pres[DCA_LBR_CHANNELS]; ///< Subband allocation flags
86 uint8_t grid_1_scf[DCA_LBR_CHANNELS][12][8]; ///< Grid 1 scale factors
87 uint8_t grid_2_scf[DCA_LBR_CHANNELS][3][64]; ///< Grid 2 scale factors
89 int8_t grid_3_avg[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS - 4]; ///< Grid 3 average values
90 int8_t grid_3_scf[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS - 4][8]; ///< Grid 3 scale factors
91 uint32_t grid_3_pres[DCA_LBR_CHANNELS]; ///< Grid 3 scale factors presence flags
93 uint8_t high_res_scf[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS][8]; ///< High-frequency resolution scale factors
95 uint8_t part_stereo[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS / 4][5]; ///< Partial stereo coefficients
96 uint8_t part_stereo_pres; ///< Partial stereo coefficients presence flags
98 float lpc_coeff[2][DCA_LBR_CHANNELS][3][2][8]; ///< Predictor coefficients
100 float sb_scf[DCA_LBR_SUBBANDS]; ///< Subband randomization scale factors
102 float *time_samples[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS]; ///< Time samples
104 float *ts_buffer; ///< Time sample buffer base
105 unsigned int ts_size; ///< Time sample buffer size
107 DECLARE_ALIGNED(32, float, history)[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS * 4]; ///< IMDCT history
108 DECLARE_ALIGNED(32, float, window)[DCA_LBR_SUBBANDS * 4]; ///< Long window for IMDCT
110 DECLARE_ALIGNED(32, float, lfe_data)[64]; ///< Decimated LFE samples
111 DECLARE_ALIGNED(32, float, lfe_history)[5][2]; ///< LFE IIR filter history
112 float lfe_scale; ///< Scale factor of LFE samples before IIR filter
114 uint8_t tonal_scf[6]; ///< Tonal scale factors
115 uint16_t tonal_bounds[5][32][2]; ///< Per-group per-subframe start/end positions of tones
116 DCALbrTone tones[DCA_LBR_TONES]; ///< Circular buffer of tones
117 int ntones; ///< Circular buffer head position
120 AVFloatDSPContext *fdsp;
121 DCADSPContext *dcadsp;
124 int ff_dca_lbr_parse(DCALbrDecoder *s, uint8_t *data, DCAExssAsset *asset);
125 int ff_dca_lbr_filter_frame(DCALbrDecoder *s, AVFrame *frame);
126 av_cold void ff_dca_lbr_flush(DCALbrDecoder *s);
127 av_cold int ff_dca_lbr_init(DCALbrDecoder *s);
128 av_cold void ff_dca_lbr_close(DCALbrDecoder *s);