FFmpeg
mdct15.h
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1 /*
2  * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
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.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVCODEC_MDCT15_H
22 #define AVCODEC_MDCT15_H
23 
24 #include <stddef.h>
25 
26 #include "fft.h"
27 
28 typedef struct MDCT15Context {
29  int fft_n;
30  int len2;
31  int len4;
32  int inverse;
33  int *pfa_prereindex;
34  int *pfa_postreindex;
35 
36  FFTContext ptwo_fft;
37  FFTComplex *tmp;
38  FFTComplex *twiddle_exptab;
39 
40  DECLARE_ALIGNED(32, FFTComplex, exptab)[64];
41 
42  /* 15-point FFT */
43  void (*fft15)(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride);
44 
45  /* PFA postrotate and exptab */
46  void (*postreindex)(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8);
47 
48  /* Calculate a full 2N -> N MDCT */
49  void (*mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride);
50 
51  /* Calculate the middle half of the iMDCT */
52  void (*imdct_half)(struct MDCT15Context *s, float *dst, const float *src,
53  ptrdiff_t stride);
54 } MDCT15Context;
55 
56 /* Init an (i)MDCT of the length 2 * 15 * (2^N) */
57 int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale);
58 void ff_mdct15_uninit(MDCT15Context **ps);
59 
60 void ff_mdct15_init_x86(MDCT15Context *s);
61 
62 #endif /* AVCODEC_MDCT15_H */
stride
int stride
Definition: mace.c:144
out
FILE * out
Definition: movenc.c:54
MDCT15Context::mdct
void(* mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride)
Definition: mdct15.h:49
MDCT15Context::fft15
void(* fft15)(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride)
Definition: mdct15.h:43
MDCT15Context::exptab
FFTComplex exptab[64]
Definition: mdct15.h:40
MDCT15Context::pfa_postreindex
int * pfa_postreindex
Definition: mdct15.h:34
ff_mdct15_uninit
void ff_mdct15_uninit(MDCT15Context **ps)
Definition: mdct15.c:43
MDCT15Context::fft_n
int fft_n
Definition: mdct15.h:29
src
#define src
Definition: vp8dsp.c:254
MDCT15Context::twiddle_exptab
FFTComplex * twiddle_exptab
Definition: mdct15.h:38
s
#define s(width, name)
Definition: cbs_vp9.c:257
MDCT15Context::pfa_prereindex
int * pfa_prereindex
Definition: mdct15.h:33
MDCT15Context
Definition: mdct15.h:28
exp
int8_t exp
Definition: eval.c:72
MDCT15Context::tmp
FFTComplex * tmp
Definition: mdct15.h:37
N
#define N
Definition: af_mcompand.c:54
MDCT15Context::len4
int len4
Definition: mdct15.h:31
ff_mdct15_init_x86
void ff_mdct15_init_x86(MDCT15Context *s)
Definition: mdct15_init.c:81
ff_mdct15_init
int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale)
Definition: mdct15.c:247
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:112
in
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method !=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2) { ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc) { av_free(ac);return NULL;} return ac;} in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar) { ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar ? ac->channels :1;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
Definition: audio_convert.c:326
FFTContext
Definition: fft.h:88
MDCT15Context::ptwo_fft
FFTContext ptwo_fft
Definition: mdct15.h:36
MDCT15Context::imdct_half
void(* imdct_half)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride)
Definition: mdct15.h:52
fft.h
MDCT15Context::postreindex
void(* postreindex)(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8)
Definition: mdct15.h:46
MDCT15Context::len2
int len2
Definition: mdct15.h:30
inverse
static uint32_t inverse(uint32_t v)
find multiplicative inverse modulo 2 ^ 32
Definition: asfcrypt.c:35
MDCT15Context::inverse
int inverse
Definition: mdct15.h:32
FFTComplex
Definition: avfft.h:37
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