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https://github.com/FFmpeg/FFmpeg.git
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135 lines
5.8 KiB
C
135 lines
5.8 KiB
C
/*
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* Copyright (C) 2016 foo86
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_DCA_LBR_H
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#define AVCODEC_DCA_LBR_H
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#include "libavutil/float_dsp.h"
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#include "libavutil/mem_internal.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "dca.h"
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#include "dca_exss.h"
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#include "dcadsp.h"
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#include "fft.h"
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#define DCA_LBR_CHANNELS 6
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#define DCA_LBR_CHANNELS_TOTAL 32
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#define DCA_LBR_SUBBANDS 32
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#define DCA_LBR_TONES 512
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#define DCA_LBR_TIME_SAMPLES 128
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#define DCA_LBR_TIME_HISTORY 8
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enum DCALBRHeader {
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DCA_LBR_HEADER_SYNC_ONLY = 1,
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DCA_LBR_HEADER_DECODER_INIT = 2
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};
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typedef struct DCALbrTone {
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uint8_t x_freq; ///< Spectral line offset
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uint8_t f_delt; ///< Difference between original and center frequency
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uint8_t ph_rot; ///< Phase rotation
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uint8_t pad; ///< Padding field
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uint8_t amp[DCA_LBR_CHANNELS]; ///< Per-channel amplitude
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uint8_t phs[DCA_LBR_CHANNELS]; ///< Per-channel phase
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} DCALbrTone;
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typedef struct DCALbrDecoder {
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AVCodecContext *avctx;
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GetBitContext gb;
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int sample_rate; ///< Sample rate of LBR audio
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int ch_mask; ///< LBR speaker mask
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int flags; ///< Flags for LBR decoder initialization
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int bit_rate_orig; ///< Original bit rate
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int bit_rate_scaled; ///< Scaled bit rate
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int nchannels; ///< Number of fullband channels to decode
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int nchannels_total; ///< Total number of fullband channels
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int freq_range; ///< Frequency range of LBR audio
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int band_limit; ///< Band limit factor
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int limited_rate; ///< Band limited sample rate
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int limited_range; ///< Band limited frequency range
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int res_profile; ///< Resolution profile
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int nsubbands; ///< Number of encoded subbands
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int g3_avg_only_start_sb; ///< Subband index where grid 3 scale factors end
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int min_mono_subband; ///< Subband index where mono encoding starts
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int max_mono_subband; ///< Subband index where mono encoding ends
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int framenum; ///< Lower 5 bits of current frame number
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int lbr_rand; ///< Seed for subband randomization
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int warned; ///< Flags for warning suppression
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uint8_t quant_levels[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS]; ///< Quantization levels
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uint8_t sb_indices[DCA_LBR_SUBBANDS]; ///< Subband reordering indices
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uint8_t sec_ch_sbms[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS]; ///< Right channel inversion or mid/side decoding flags
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uint8_t sec_ch_lrms[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS]; ///< Flags indicating if left/right channel are swapped
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uint32_t ch_pres[DCA_LBR_CHANNELS]; ///< Subband allocation flags
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uint8_t grid_1_scf[DCA_LBR_CHANNELS][12][8]; ///< Grid 1 scale factors
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uint8_t grid_2_scf[DCA_LBR_CHANNELS][3][64]; ///< Grid 2 scale factors
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int8_t grid_3_avg[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS - 4]; ///< Grid 3 average values
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int8_t grid_3_scf[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS - 4][8]; ///< Grid 3 scale factors
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uint32_t grid_3_pres[DCA_LBR_CHANNELS]; ///< Grid 3 scale factors presence flags
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uint8_t high_res_scf[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS][8]; ///< High-frequency resolution scale factors
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uint8_t part_stereo[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS / 4][5]; ///< Partial stereo coefficients
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uint8_t part_stereo_pres; ///< Partial stereo coefficients presence flags
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float lpc_coeff[2][DCA_LBR_CHANNELS][3][2][8]; ///< Predictor coefficients
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float sb_scf[DCA_LBR_SUBBANDS]; ///< Subband randomization scale factors
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float *time_samples[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS]; ///< Time samples
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float *ts_buffer; ///< Time sample buffer base
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unsigned int ts_size; ///< Time sample buffer size
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DECLARE_ALIGNED(32, float, history)[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS * 4]; ///< IMDCT history
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DECLARE_ALIGNED(32, float, window)[DCA_LBR_SUBBANDS * 4]; ///< Long window for IMDCT
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DECLARE_ALIGNED(32, float, lfe_data)[64]; ///< Decimated LFE samples
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DECLARE_ALIGNED(32, float, lfe_history)[5][2]; ///< LFE IIR filter history
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float lfe_scale; ///< Scale factor of LFE samples before IIR filter
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uint8_t tonal_scf[6]; ///< Tonal scale factors
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uint16_t tonal_bounds[5][32][2]; ///< Per-group per-subframe start/end positions of tones
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DCALbrTone tones[DCA_LBR_TONES]; ///< Circular buffer of tones
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int ntones; ///< Circular buffer head position
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FFTContext imdct;
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AVFloatDSPContext *fdsp;
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DCADSPContext *dcadsp;
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} DCALbrDecoder;
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int ff_dca_lbr_parse(DCALbrDecoder *s, uint8_t *data, DCAExssAsset *asset);
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int ff_dca_lbr_filter_frame(DCALbrDecoder *s, AVFrame *frame);
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av_cold void ff_dca_lbr_flush(DCALbrDecoder *s);
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av_cold void ff_dca_lbr_init_tables(void);
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av_cold int ff_dca_lbr_init(DCALbrDecoder *s);
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av_cold void ff_dca_lbr_close(DCALbrDecoder *s);
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#endif
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