161 lines
4.5 KiB
C
161 lines
4.5 KiB
C
/*
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* Opus decoder/demuxer common functions
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* Copyright (c) 2012 Andrew D'Addesio
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* Copyright (c) 2013-2014 Mozilla Corporation
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* Copyright (c) 2016 Rostislav Pehlivanov <atomnuker@gmail.com>
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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_OPUS_CELT_H
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#define AVCODEC_OPUS_CELT_H
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#include <float.h>
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#include "opus.h"
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#include "mdct15.h"
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#include "libavutil/float_dsp.h"
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#include "libavutil/libm.h"
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#define CELT_VECTORS 11
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#define CELT_ALLOC_STEPS 6
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#define CELT_FINE_OFFSET 21
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#define CELT_MAX_FINE_BITS 8
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#define CELT_NORM_SCALE 16384
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#define CELT_QTHETA_OFFSET 4
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#define CELT_QTHETA_OFFSET_TWOPHASE 16
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#define CELT_EMPH_COEFF 0.85000610f
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#define CELT_POSTFILTER_MINPERIOD 15
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#define CELT_ENERGY_SILENCE (-28.0f)
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enum CeltSpread {
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CELT_SPREAD_NONE,
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CELT_SPREAD_LIGHT,
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CELT_SPREAD_NORMAL,
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CELT_SPREAD_AGGRESSIVE
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};
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enum CeltBlockSize {
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CELT_BLOCK_120,
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CELT_BLOCK_240,
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CELT_BLOCK_480,
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CELT_BLOCK_960,
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CELT_BLOCK_NB
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};
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typedef struct CeltBlock {
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float energy[CELT_MAX_BANDS];
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float lin_energy[CELT_MAX_BANDS];
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float error_energy[CELT_MAX_BANDS];
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float prev_energy[2][CELT_MAX_BANDS];
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uint8_t collapse_masks[CELT_MAX_BANDS];
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/* buffer for mdct output + postfilter */
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DECLARE_ALIGNED(32, float, buf)[2048];
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DECLARE_ALIGNED(32, float, coeffs)[CELT_MAX_FRAME_SIZE];
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/* Used by the encoder */
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DECLARE_ALIGNED(32, float, overlap)[120];
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DECLARE_ALIGNED(32, float, samples)[CELT_MAX_FRAME_SIZE];
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/* postfilter parameters */
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int pf_period_new;
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float pf_gains_new[3];
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int pf_period;
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float pf_gains[3];
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int pf_period_old;
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float pf_gains_old[3];
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float emph_coeff;
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} CeltBlock;
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struct CeltFrame {
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// constant values that do not change during context lifetime
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AVCodecContext *avctx;
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MDCT15Context *imdct[4];
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AVFloatDSPContext *dsp;
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CeltBlock block[2];
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int channels;
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int output_channels;
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enum CeltBlockSize size;
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int start_band;
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int end_band;
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int coded_bands;
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int transient;
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int pfilter;
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int skip_band_floor;
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int tf_select;
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int alloc_trim;
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int alloc_boost[CELT_MAX_BANDS];
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int blocks; /* number of iMDCT blocks in the frame, depends on transient */
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int blocksize; /* size of each block */
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int silence; /* Frame is filled with silence */
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int anticollapse_needed; /* Whether to expect an anticollapse bit */
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int anticollapse; /* Encoded anticollapse bit */
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int intensity_stereo;
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int dual_stereo;
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int flushed;
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uint32_t seed;
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enum CeltSpread spread;
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/* Bit allocation */
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int framebits;
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int remaining;
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int remaining2;
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int caps [CELT_MAX_BANDS];
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int fine_bits [CELT_MAX_BANDS];
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int fine_priority[CELT_MAX_BANDS];
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int pulses [CELT_MAX_BANDS];
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int tf_change [CELT_MAX_BANDS];
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DECLARE_ALIGNED(32, float, scratch)[22 * 8]; // MAX(ff_celt_freq_range) * 1<<CELT_MAX_LOG_BLOCKS
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};
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/* LCG for noise generation */
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static av_always_inline uint32_t celt_rng(CeltFrame *f)
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{
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f->seed = 1664525 * f->seed + 1013904223;
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return f->seed;
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}
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static av_always_inline void celt_renormalize_vector(float *X, int N, float gain)
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{
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int i;
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float g = 1e-15f;
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for (i = 0; i < N; i++)
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g += X[i] * X[i];
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g = gain / sqrtf(g);
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for (i = 0; i < N; i++)
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X[i] *= g;
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}
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int ff_celt_init(AVCodecContext *avctx, CeltFrame **f, int output_channels);
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void ff_celt_free(CeltFrame **f);
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void ff_celt_flush(CeltFrame *f);
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int ff_celt_decode_frame(CeltFrame *f, OpusRangeCoder *rc, float **output,
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int coded_channels, int frame_size, int startband, int endband);
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#endif /* AVCODEC_OPUS_CELT_H */
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