2 * Copyright (C) 2016 foo86
4 * This file is part of FFmpeg.
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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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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_internal.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
45 DCA_LBR_HEADER_SYNC_ONLY = 1,
46 DCA_LBR_HEADER_DECODER_INIT = 2
49 typedef struct DCALbrTone {
50 uint8_t x_freq; ///< Spectral line offset
51 uint8_t f_delt; ///< Difference between original and center frequency
52 uint8_t ph_rot; ///< Phase rotation
53 uint8_t pad; ///< Padding field
54 uint8_t amp[DCA_LBR_CHANNELS]; ///< Per-channel amplitude
55 uint8_t phs[DCA_LBR_CHANNELS]; ///< Per-channel phase
58 typedef struct DCALbrDecoder {
59 AVCodecContext *avctx;
62 int sample_rate; ///< Sample rate of LBR audio
63 int ch_mask; ///< LBR speaker mask
64 int flags; ///< Flags for LBR decoder initialization
65 int bit_rate_orig; ///< Original bit rate
66 int bit_rate_scaled; ///< Scaled bit rate
68 int nchannels; ///< Number of fullband channels to decode
69 int nchannels_total; ///< Total number of fullband channels
70 int freq_range; ///< Frequency range of LBR audio
71 int band_limit; ///< Band limit factor
72 int limited_rate; ///< Band limited sample rate
73 int limited_range; ///< Band limited frequency range
74 int res_profile; ///< Resolution profile
75 int nsubbands; ///< Number of encoded subbands
76 int g3_avg_only_start_sb; ///< Subband index where grid 3 scale factors end
77 int min_mono_subband; ///< Subband index where mono encoding starts
78 int max_mono_subband; ///< Subband index where mono encoding ends
80 int framenum; ///< Lower 5 bits of current frame number
81 int lbr_rand; ///< Seed for subband randomization
82 int warned; ///< Flags for warning suppression
84 uint8_t quant_levels[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS]; ///< Quantization levels
85 uint8_t sb_indices[DCA_LBR_SUBBANDS]; ///< Subband reordering indices
87 uint8_t sec_ch_sbms[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS]; ///< Right channel inversion or mid/side decoding flags
88 uint8_t sec_ch_lrms[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS]; ///< Flags indicating if left/right channel are swapped
89 uint32_t ch_pres[DCA_LBR_CHANNELS]; ///< Subband allocation flags
91 uint8_t grid_1_scf[DCA_LBR_CHANNELS][12][8]; ///< Grid 1 scale factors
92 uint8_t grid_2_scf[DCA_LBR_CHANNELS][3][64]; ///< Grid 2 scale factors
94 int8_t grid_3_avg[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS - 4]; ///< Grid 3 average values
95 int8_t grid_3_scf[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS - 4][8]; ///< Grid 3 scale factors
96 uint32_t grid_3_pres[DCA_LBR_CHANNELS]; ///< Grid 3 scale factors presence flags
98 uint8_t high_res_scf[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS][8]; ///< High-frequency resolution scale factors
100 uint8_t part_stereo[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS / 4][5]; ///< Partial stereo coefficients
101 uint8_t part_stereo_pres; ///< Partial stereo coefficients presence flags
103 float lpc_coeff[2][DCA_LBR_CHANNELS][3][2][8]; ///< Predictor coefficients
105 float sb_scf[DCA_LBR_SUBBANDS]; ///< Subband randomization scale factors
107 float *time_samples[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS]; ///< Time samples
109 float *ts_buffer; ///< Time sample buffer base
110 unsigned int ts_size; ///< Time sample buffer size
112 DECLARE_ALIGNED(32, float, history)[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS * 4]; ///< IMDCT history
113 DECLARE_ALIGNED(32, float, window)[DCA_LBR_SUBBANDS * 4]; ///< Long window for IMDCT
115 DECLARE_ALIGNED(32, float, lfe_data)[64]; ///< Decimated LFE samples
116 DECLARE_ALIGNED(32, float, lfe_history)[5][2]; ///< LFE IIR filter history
117 float lfe_scale; ///< Scale factor of LFE samples before IIR filter
119 uint8_t tonal_scf[6]; ///< Tonal scale factors
120 uint16_t tonal_bounds[5][32][2]; ///< Per-group per-subframe start/end positions of tones
121 DCALbrTone tones[DCA_LBR_TONES]; ///< Circular buffer of tones
122 int ntones; ///< Circular buffer head position
125 AVFloatDSPContext *fdsp;
126 DCADSPContext *dcadsp;
129 int ff_dca_lbr_parse(DCALbrDecoder *s, uint8_t *data, DCAExssAsset *asset);
130 int ff_dca_lbr_filter_frame(DCALbrDecoder *s, AVFrame *frame);
131 av_cold void ff_dca_lbr_flush(DCALbrDecoder *s);
132 av_cold int ff_dca_lbr_init(DCALbrDecoder *s);
133 av_cold void ff_dca_lbr_close(DCALbrDecoder *s);