FFmpeg/libavcodec/mpegaudiodsp.h

/*
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_MPEGAUDIODSP_H
#define AVCODEC_MPEGAUDIODSP_H

#include <stddef.h>
#include <stdint.h>

#include "libavutil/common.h"

typedef struct MPADSPContext {
    void (*apply_window_float)(float *synth_buf, float *window,
                               int *dither_state, float *samples,
                               ptrdiff_t incr);
    void (*apply_window_fixed)(int32_t *synth_buf, int32_t *window,
                               int *dither_state, int16_t *samples,
                               ptrdiff_t incr);
    void (*dct32_float)(float *dst, const float *src);
    void (*dct32_fixed)(int *dst, const int *src);
    void (*imdct36_blocks_float)(float *out, float *buf, float *in,
                                 int count, int switch_point, int block_type);
    void (*imdct36_blocks_fixed)(int *out, int *buf, int *in,
                                 int count, int switch_point, int block_type);
} MPADSPContext;

void ff_mpadsp_init(MPADSPContext *s);

extern int32_t ff_mpa_synth_window_fixed[];
extern float   ff_mpa_synth_window_float[];

extern const int32_t ff_mpa_enwindow[257];

void ff_mpa_synth_filter_fixed(MPADSPContext *s,
                               int32_t *synth_buf_ptr, int *synth_buf_offset,
                               int32_t *window, int *dither_state,
                               int16_t *samples, ptrdiff_t incr,
                               int32_t *sb_samples);

void ff_mpa_synth_filter_float(MPADSPContext *s,
                               float *synth_buf_ptr, int *synth_buf_offset,
                               float *window, int *dither_state,
                               float *samples, ptrdiff_t incr,
                               float *sb_samples);

void ff_mpadsp_init_aarch64(MPADSPContext *s);
void ff_mpadsp_init_arm(MPADSPContext *s);
void ff_mpadsp_init_ppc(MPADSPContext *s);
void ff_mpadsp_init_x86(MPADSPContext *s);

void ff_mpa_synth_init_float(float *window);
void ff_mpa_synth_init_fixed(int32_t *window);

void ff_mpadsp_apply_window_float(float *synth_buf, float *window,
                                  int *dither_state, float *samples,
                                  ptrdiff_t incr);
void ff_mpadsp_apply_window_fixed(int32_t *synth_buf, int32_t *window,
                                  int *dither_state, int16_t *samples,
                                  ptrdiff_t incr);

void ff_imdct36_blocks_float(float *out, float *buf, float *in,
                             int count, int switch_point, int block_type);

void ff_imdct36_blocks_fixed(int *out, int *buf, int *in,
                             int count, int switch_point, int block_type);

void ff_init_mpadsp_tabs_float(void);
void ff_init_mpadsp_tabs_fixed(void);

/** For SSE implementation, MDCT_BUF_SIZE/2 should be 128-bit aligned */
#define MDCT_BUF_SIZE FFALIGN(36, 2*4)

extern int ff_mdct_win_fixed[8][MDCT_BUF_SIZE];
extern float ff_mdct_win_float[8][MDCT_BUF_SIZE];

#endif /* AVCODEC_MPEGAUDIODSP_H */