FFmpeg
All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
synth_filter.c
Go to the documentation of this file.
1 /*
2  * copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
3  * Copyright (C) 2016 foo86
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "fft.h"
23 #include "dcadct.h"
24 #include "dcamath.h"
25 #include "synth_filter.h"
26 
27 static void synth_filter_float(FFTContext *imdct,
28  float *synth_buf_ptr, int *synth_buf_offset,
29  float synth_buf2[32], const float window[512],
30  float out[32], const float in[32], float scale)
31 {
32  float *synth_buf = synth_buf_ptr + *synth_buf_offset;
33  int i, j;
34 
35  imdct->imdct_half(imdct, synth_buf, in);
36 
37  for (i = 0; i < 16; i++) {
38  float a = synth_buf2[i ];
39  float b = synth_buf2[i + 16];
40  float c = 0;
41  float d = 0;
42  for (j = 0; j < 512 - *synth_buf_offset; j += 64) {
43  a += window[i + j ] * (-synth_buf[15 - i + j ]);
44  b += window[i + j + 16] * ( synth_buf[ i + j ]);
45  c += window[i + j + 32] * ( synth_buf[16 + i + j ]);
46  d += window[i + j + 48] * ( synth_buf[31 - i + j ]);
47  }
48  for ( ; j < 512; j += 64) {
49  a += window[i + j ] * (-synth_buf[15 - i + j - 512]);
50  b += window[i + j + 16] * ( synth_buf[ i + j - 512]);
51  c += window[i + j + 32] * ( synth_buf[16 + i + j - 512]);
52  d += window[i + j + 48] * ( synth_buf[31 - i + j - 512]);
53  }
54  out[i ] = a * scale;
55  out[i + 16] = b * scale;
56  synth_buf2[i ] = c;
57  synth_buf2[i + 16] = d;
58  }
59 
60  *synth_buf_offset = (*synth_buf_offset - 32) & 511;
61 }
62 
63 static void synth_filter_float_64(FFTContext *imdct,
64  float *synth_buf_ptr, int *synth_buf_offset,
65  float synth_buf2[64], const float window[1024],
66  float out[64], const float in[64], float scale)
67 {
68  float *synth_buf = synth_buf_ptr + *synth_buf_offset;
69  int i, j;
70 
71  imdct->imdct_half(imdct, synth_buf, in);
72 
73  for (i = 0; i < 32; i++) {
74  float a = synth_buf2[i ];
75  float b = synth_buf2[i + 32];
76  float c = 0;
77  float d = 0;
78  for (j = 0; j < 1024 - *synth_buf_offset; j += 128) {
79  a += window[i + j ] * (-synth_buf[31 - i + j ]);
80  b += window[i + j + 32] * ( synth_buf[ i + j ]);
81  c += window[i + j + 64] * ( synth_buf[32 + i + j ]);
82  d += window[i + j + 96] * ( synth_buf[63 - i + j ]);
83  }
84  for ( ; j < 1024; j += 128) {
85  a += window[i + j ] * (-synth_buf[31 - i + j - 1024]);
86  b += window[i + j + 32] * ( synth_buf[ i + j - 1024]);
87  c += window[i + j + 64] * ( synth_buf[32 + i + j - 1024]);
88  d += window[i + j + 96] * ( synth_buf[63 - i + j - 1024]);
89  }
90  out[i ] = a * scale;
91  out[i + 32] = b * scale;
92  synth_buf2[i ] = c;
93  synth_buf2[i + 32] = d;
94  }
95 
96  *synth_buf_offset = (*synth_buf_offset - 64) & 1023;
97 }
98 
99 static void synth_filter_fixed(DCADCTContext *imdct,
100  int32_t *synth_buf_ptr, int *synth_buf_offset,
101  int32_t synth_buf2[32], const int32_t window[512],
102  int32_t out[32], const int32_t in[32])
103 {
104  int32_t *synth_buf = synth_buf_ptr + *synth_buf_offset;
105  int i, j;
106 
107  imdct->imdct_half[0](synth_buf, in);
108 
109  for (i = 0; i < 16; i++) {
110  int64_t a = synth_buf2[i ] * (INT64_C(1) << 21);
111  int64_t b = synth_buf2[i + 16] * (INT64_C(1) << 21);
112  int64_t c = 0;
113  int64_t d = 0;
114  for (j = 0; j < 512 - *synth_buf_offset; j += 64) {
115  a += (int64_t)window[i + j ] * synth_buf[ i + j ];
116  b += (int64_t)window[i + j + 16] * synth_buf[15 - i + j ];
117  c += (int64_t)window[i + j + 32] * synth_buf[16 + i + j ];
118  d += (int64_t)window[i + j + 48] * synth_buf[31 - i + j ];
119  }
120  for ( ; j < 512; j += 64) {
121  a += (int64_t)window[i + j ] * synth_buf[ i + j - 512];
122  b += (int64_t)window[i + j + 16] * synth_buf[15 - i + j - 512];
123  c += (int64_t)window[i + j + 32] * synth_buf[16 + i + j - 512];
124  d += (int64_t)window[i + j + 48] * synth_buf[31 - i + j - 512];
125  }
126  out[i ] = clip23(norm21(a));
127  out[i + 16] = clip23(norm21(b));
128  synth_buf2[i ] = norm21(c);
129  synth_buf2[i + 16] = norm21(d);
130  }
131 
132  *synth_buf_offset = (*synth_buf_offset - 32) & 511;
133 }
134 
136  int32_t *synth_buf_ptr, int *synth_buf_offset,
137  int32_t synth_buf2[64], const int32_t window[1024],
138  int32_t out[64], const int32_t in[64])
139 {
140  int32_t *synth_buf = synth_buf_ptr + *synth_buf_offset;
141  int i, j;
142 
143  imdct->imdct_half[1](synth_buf, in);
144 
145  for (i = 0; i < 32; i++) {
146  int64_t a = synth_buf2[i ] * (INT64_C(1) << 20);
147  int64_t b = synth_buf2[i + 32] * (INT64_C(1) << 20);
148  int64_t c = 0;
149  int64_t d = 0;
150  for (j = 0; j < 1024 - *synth_buf_offset; j += 128) {
151  a += (int64_t)window[i + j ] * synth_buf[ i + j ];
152  b += (int64_t)window[i + j + 32] * synth_buf[31 - i + j ];
153  c += (int64_t)window[i + j + 64] * synth_buf[32 + i + j ];
154  d += (int64_t)window[i + j + 96] * synth_buf[63 - i + j ];
155  }
156  for ( ; j < 1024; j += 128) {
157  a += (int64_t)window[i + j ] * synth_buf[ i + j - 1024];
158  b += (int64_t)window[i + j + 32] * synth_buf[31 - i + j - 1024];
159  c += (int64_t)window[i + j + 64] * synth_buf[32 + i + j - 1024];
160  d += (int64_t)window[i + j + 96] * synth_buf[63 - i + j - 1024];
161  }
162  out[i ] = clip23(norm20(a));
163  out[i + 32] = clip23(norm20(b));
164  synth_buf2[i ] = norm20(c);
165  synth_buf2[i + 32] = norm20(d);
166  }
167 
168  *synth_buf_offset = (*synth_buf_offset - 64) & 1023;
169 }
170 
172 {
177 
178  if (ARCH_AARCH64)
180  if (ARCH_ARM)
182  if (ARCH_X86)
184 }
void ff_synth_filter_init_x86(SynthFilterContext *c)
const char * b
Definition: vf_curves.c:109
static void synth_filter_float_64(FFTContext *imdct, float *synth_buf_ptr, int *synth_buf_offset, float synth_buf2[64], const float window[1024], float out[64], const float in[64], float scale)
Definition: synth_filter.c:63
void(* synth_filter_float_64)(FFTContext *imdct, float *synth_buf_ptr, int *synth_buf_offset, float synth_buf2[64], const float window[1024], float out[64], const float in[64], float scale)
Definition: synth_filter.h:33
av_cold void ff_synth_filter_init(SynthFilterContext *c)
Definition: synth_filter.c:171
void(* synth_filter_fixed_64)(DCADCTContext *imdct, int32_t *synth_buf_ptr, int *synth_buf_offset, int32_t synth_buf2[64], const int32_t window[1024], int32_t out[64], const int32_t in[64])
Definition: synth_filter.h:41
static void synth_filter_fixed_64(DCADCTContext *imdct, int32_t *synth_buf_ptr, int *synth_buf_offset, int32_t synth_buf2[64], const int32_t window[1024], int32_t out[64], const int32_t in[64])
Definition: synth_filter.c:135
static int32_t clip23(int32_t a)
Definition: dcamath.h:53
#define av_cold
Definition: attributes.h:82
static int32_t norm20(int64_t a)
Definition: dcamath.h:42
av_cold void ff_synth_filter_init_arm(SynthFilterContext *s)
static void synth_filter_float(FFTContext *imdct, float *synth_buf_ptr, int *synth_buf_offset, float synth_buf2[32], const float window[512], float out[32], const float in[32], float scale)
Definition: synth_filter.c:27
Definition: fft.h:88
int32_t
static int32_t norm21(int64_t a)
Definition: dcamath.h:43
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;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);returnNULL;}returnac;}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;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->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);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
void(* imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input)
Definition: fft.h:108
av_cold void ff_synth_filter_init_aarch64(SynthFilterContext *s)
void(* synth_filter_float)(FFTContext *imdct, float *synth_buf_ptr, int *synth_buf_offset, float synth_buf2[32], const float window[512], float out[32], const float in[32], float scale)
Definition: synth_filter.h:28
static double c[64]
static void synth_filter_fixed(DCADCTContext *imdct, int32_t *synth_buf_ptr, int *synth_buf_offset, int32_t synth_buf2[32], const int32_t window[512], int32_t out[32], const int32_t in[32])
Definition: synth_filter.c:99
void(* synth_filter_fixed)(DCADCTContext *imdct, int32_t *synth_buf_ptr, int *synth_buf_offset, int32_t synth_buf2[32], const int32_t window[512], int32_t out[32], const int32_t in[32])
Definition: synth_filter.h:37
void(* imdct_half[2])(int32_t *output, const int32_t *input)
Definition: dcadct.h:27
FILE * out
Definition: movenc.c:54