swresample_internal.h

/*
 * Copyright (C) 2011-2013 Michael Niedermayer (michaelni@gmx.at)
 *
 * This file is part of libswresample
 *
 * libswresample is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * libswresample is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with libswresample; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef SWRESAMPLE_SWRESAMPLE_INTERNAL_H
#define SWRESAMPLE_SWRESAMPLE_INTERNAL_H

#include "swresample.h"
#include "libavutil/channel_layout.h"
#include "config.h"

#define SWR_CH_MAX 64

#define SQRT3_2      1.22474487139158904909  /* sqrt(3/2) */

#define NS_TAPS 20

#if ARCH_X86_64
typedef int64_t integer;
#else
typedef int integer;
#endif

typedef void (mix_1_1_func_type)(void *out, const void *in, void *coeffp, integer index, integer len);
typedef void (mix_2_1_func_type)(void *out, const void *in1, const void *in2, void *coeffp, integer index1, integer index2, integer len);

typedef void (mix_any_func_type)(uint8_t **out, const uint8_t **in1, void *coeffp, integer len);

typedef struct AudioData{
    uint8_t *ch[SWR_CH_MAX];    
    uint8_t *data;              
    int ch_count;               
    int bps;                    
    int count;                  
    int planar;                 
    enum AVSampleFormat fmt;    
} AudioData;

struct DitherContext {
    int method;
    int noise_pos;
    float scale;
    float noise_scale;                              
    int ns_taps;                                    
    float ns_scale;                                 
    float ns_scale_1;                               
    int ns_pos;                                     
    float ns_coeffs[NS_TAPS];                       
    float ns_errors[SWR_CH_MAX][2*NS_TAPS];
    AudioData noise;                                
    AudioData temp;                                 
    int output_sample_bits;                         
};

typedef struct ResampleContext * (* resample_init_func)(struct ResampleContext *c, int out_rate, int in_rate, int filter_size, int phase_shift, int linear,
                                    double cutoff, enum AVSampleFormat format, enum SwrFilterType filter_type, double kaiser_beta, double precision, int cheby, int exact_rational);
typedef void    (* resample_free_func)(struct ResampleContext **c);
typedef int     (* multiple_resample_func)(struct ResampleContext *c, AudioData *dst, int dst_size, AudioData *src, int src_size, int *consumed);
typedef int     (* resample_flush_func)(struct SwrContext *c);
typedef int     (* set_compensation_func)(struct ResampleContext *c, int sample_delta, int compensation_distance);
typedef int64_t (* get_delay_func)(struct SwrContext *s, int64_t base);
typedef int     (* invert_initial_buffer_func)(struct ResampleContext *c, AudioData *dst, const AudioData *src, int src_size, int *dst_idx, int *dst_count);
typedef int64_t (* get_out_samples_func)(struct SwrContext *s, int in_samples);

struct Resampler {
  resample_init_func            init;
  resample_free_func            free;
  multiple_resample_func        multiple_resample;
  resample_flush_func           flush;
  set_compensation_func         set_compensation;
  get_delay_func                get_delay;
  invert_initial_buffer_func    invert_initial_buffer;
  get_out_samples_func          get_out_samples;
};

extern struct Resampler const swri_resampler;
extern struct Resampler const swri_soxr_resampler;

struct SwrContext {
    const AVClass *av_class;                        
    int log_level_offset;                           
    void *log_ctx;                                  
    enum AVSampleFormat  in_sample_fmt;             
    enum AVSampleFormat int_sample_fmt;             
    enum AVSampleFormat out_sample_fmt;             
    int64_t  in_ch_layout;                          
    int64_t out_ch_layout;                          
    int      in_sample_rate;                        
    int     out_sample_rate;                        
    int flags;                                      
    float slev;                                     
    float clev;                                     
    float lfe_mix_level;                            
    float rematrix_volume;                          
    float rematrix_maxval;                          
    int matrix_encoding;                            
    const int *channel_map;                         
    int used_ch_count;                              
    int engine;

    int user_in_ch_count;                           
    int user_out_ch_count;                          
    int user_used_ch_count;                         
    int64_t user_in_ch_layout;                      
    int64_t user_out_ch_layout;                     
    enum AVSampleFormat user_int_sample_fmt;        
    int user_dither_method;                         

    struct DitherContext dither;

    int filter_size;                                
    int phase_shift;                                
    int linear_interp;                              
    int exact_rational;                             
    double cutoff;                                  
    int filter_type;                                
    double kaiser_beta;                                
    double precision;                               
    int cheby;                                      
    float min_compensation;                         
    float min_hard_compensation;                    
    float soft_compensation_duration;               
    float max_soft_compensation;                    
    float async;                                    
    int64_t firstpts_in_samples;                    

    int resample_first;                             
    int rematrix;                                   
    int rematrix_custom;                            

    AudioData in;                                   
    AudioData postin;                               
    AudioData midbuf;                               
    AudioData preout;                               
    AudioData out;                                  
    AudioData in_buffer;                            
    AudioData silence;                              
    AudioData drop_temp;                            
    int in_buffer_index;                            
    int in_buffer_count;                            
    int resample_in_constraint;                     
    int flushed;                                    
    int64_t outpts;                                 
    int64_t firstpts;                               
    int drop_output;                                
    double delayed_samples_fixup;                   

    struct AudioConvert *in_convert;                
    struct AudioConvert *out_convert;               
    struct AudioConvert *full_convert;              
    struct ResampleContext *resample;               
    struct Resampler const *resampler;              

    double matrix[SWR_CH_MAX][SWR_CH_MAX];          
    float matrix_flt[SWR_CH_MAX][SWR_CH_MAX];       
    uint8_t *native_matrix;
    uint8_t *native_one;
    uint8_t *native_simd_one;
    uint8_t *native_simd_matrix;
    int32_t matrix32[SWR_CH_MAX][SWR_CH_MAX];       
    uint8_t matrix_ch[SWR_CH_MAX][SWR_CH_MAX+1];    
    mix_1_1_func_type *mix_1_1_f;
    mix_1_1_func_type *mix_1_1_simd;

    mix_2_1_func_type *mix_2_1_f;
    mix_2_1_func_type *mix_2_1_simd;

    mix_any_func_type *mix_any_f;

    /* TODO: callbacks for ASM optimizations */
};

av_warn_unused_result
int swri_realloc_audio(AudioData *a, int count);

void swri_noise_shaping_int16 (SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count);
void swri_noise_shaping_int32 (SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count);
void swri_noise_shaping_float (SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count);
void swri_noise_shaping_double(SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count);

av_warn_unused_result
int swri_rematrix_init(SwrContext *s);
void swri_rematrix_free(SwrContext *s);
int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy);
int swri_rematrix_init_x86(struct SwrContext *s);

av_warn_unused_result
int swri_get_dither(SwrContext *s, void *dst, int len, unsigned seed, enum AVSampleFormat noise_fmt);
av_warn_unused_result
int swri_dither_init(SwrContext *s, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt);

void swri_audio_convert_init_aarch64(struct AudioConvert *ac,
                                 enum AVSampleFormat out_fmt,
                                 enum AVSampleFormat in_fmt,
                                 int channels);
void swri_audio_convert_init_arm(struct AudioConvert *ac,
                                 enum AVSampleFormat out_fmt,
                                 enum AVSampleFormat in_fmt,
                                 int channels);
void swri_audio_convert_init_x86(struct AudioConvert *ac,
                                 enum AVSampleFormat out_fmt,
                                 enum AVSampleFormat in_fmt,
                                 int channels);

#endif