FFmpeg
flacdsp.c
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1 /*
2  * Copyright (c) 2012 Mans Rullgard <mans@mansr.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 #include "libavutil/attributes.h"
22 #include "libavutil/internal.h"
23 #include "libavutil/samplefmt.h"
24 #include "flacdsp.h"
25 #include "config.h"
26 
27 #define SAMPLE_SIZE 16
28 #define PLANAR 0
29 #include "flacdsp_template.c"
30 
31 #undef PLANAR
32 #define PLANAR 1
33 #include "flacdsp_template.c"
34 
35 #undef SAMPLE_SIZE
36 #undef PLANAR
37 #define SAMPLE_SIZE 32
38 #define PLANAR 0
39 #include "flacdsp_template.c"
40 
41 #undef PLANAR
42 #define PLANAR 1
43 #include "flacdsp_template.c"
44 
45 static void flac_lpc_16_c(int32_t *decoded, const int coeffs[32],
46  int pred_order, int qlevel, int len)
47 {
48  int i, j;
49 
50  for (i = pred_order; i < len - 1; i += 2, decoded += 2) {
51  SUINT c = coeffs[0];
52  SUINT d = decoded[0];
53  int s0 = 0, s1 = 0;
54  for (j = 1; j < pred_order; j++) {
55  s0 += c*d;
56  d = decoded[j];
57  s1 += c*d;
58  c = coeffs[j];
59  }
60  s0 += c*d;
61  d = decoded[j] += (SUINT)(s0 >> qlevel);
62  s1 += c*d;
63  decoded[j + 1] += (SUINT)(s1 >> qlevel);
64  }
65  if (i < len) {
66  int sum = 0;
67  for (j = 0; j < pred_order; j++)
68  sum += coeffs[j] * (SUINT)decoded[j];
69  decoded[j] = decoded[j] + (unsigned)(sum >> qlevel);
70  }
71 }
72 
73 static void flac_lpc_32_c(int32_t *decoded, const int coeffs[32],
74  int pred_order, int qlevel, int len)
75 {
76  int i, j;
77 
78  for (i = pred_order; i < len; i++, decoded++) {
79  int64_t sum = 0;
80  for (j = 0; j < pred_order; j++)
81  sum += (int64_t)coeffs[j] * decoded[j];
82  decoded[j] += sum >> qlevel;
83  }
84 
85 }
86 
88 {
89  c->lpc16 = flac_lpc_16_c;
90  c->lpc32 = flac_lpc_32_c;
91 
92  switch (fmt) {
93  case AV_SAMPLE_FMT_S32:
94  c->decorrelate[0] = flac_decorrelate_indep_c_32;
95  c->decorrelate[1] = flac_decorrelate_ls_c_32;
96  c->decorrelate[2] = flac_decorrelate_rs_c_32;
97  c->decorrelate[3] = flac_decorrelate_ms_c_32;
98  break;
99 
100  case AV_SAMPLE_FMT_S32P:
101  c->decorrelate[0] = flac_decorrelate_indep_c_32p;
102  c->decorrelate[1] = flac_decorrelate_ls_c_32p;
103  c->decorrelate[2] = flac_decorrelate_rs_c_32p;
104  c->decorrelate[3] = flac_decorrelate_ms_c_32p;
105  break;
106 
107  case AV_SAMPLE_FMT_S16:
108  c->decorrelate[0] = flac_decorrelate_indep_c_16;
109  c->decorrelate[1] = flac_decorrelate_ls_c_16;
110  c->decorrelate[2] = flac_decorrelate_rs_c_16;
111  c->decorrelate[3] = flac_decorrelate_ms_c_16;
112  break;
113 
114  case AV_SAMPLE_FMT_S16P:
115  c->decorrelate[0] = flac_decorrelate_indep_c_16p;
116  c->decorrelate[1] = flac_decorrelate_ls_c_16p;
117  c->decorrelate[2] = flac_decorrelate_rs_c_16p;
118  c->decorrelate[3] = flac_decorrelate_ms_c_16p;
119  break;
120  }
121 
122 #if ARCH_ARM
124 #elif ARCH_RISCV
126 #elif ARCH_X86
128 #endif
129 }
AV_SAMPLE_FMT_S32P
@ AV_SAMPLE_FMT_S32P
signed 32 bits, planar
Definition: samplefmt.h:65
flacdsp.h
samplefmt.h
av_cold
#define av_cold
Definition: attributes.h:90
s1
#define s1
Definition: regdef.h:38
channels
channels
Definition: aptx.h:31
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
flac_lpc_32_c
static void flac_lpc_32_c(int32_t *decoded, const int coeffs[32], int pred_order, int qlevel, int len)
Definition: flacdsp.c:73
ff_flacdsp_init
av_cold void ff_flacdsp_init(FLACDSPContext *c, enum AVSampleFormat fmt, int channels)
Definition: flacdsp.c:87
attributes.h
AV_SAMPLE_FMT_S16P
@ AV_SAMPLE_FMT_S16P
signed 16 bits, planar
Definition: samplefmt.h:64
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
internal.h
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
SUINT
#define SUINT
Definition: dct32_template.c:30
AV_SAMPLE_FMT_S16
@ AV_SAMPLE_FMT_S16
signed 16 bits
Definition: samplefmt.h:58
len
int len
Definition: vorbis_enc_data.h:426
ff_flacdsp_init_x86
void ff_flacdsp_init_x86(FLACDSPContext *c, enum AVSampleFormat fmt, int channels)
Definition: flacdsp_init.c:58
flac_lpc_16_c
static void flac_lpc_16_c(int32_t *decoded, const int coeffs[32], int pred_order, int qlevel, int len)
Definition: flacdsp.c:45
ff_flacdsp_init_arm
av_cold void ff_flacdsp_init_arm(FLACDSPContext *c, enum AVSampleFormat fmt, int channels)
Definition: flacdsp_init_arm.c:27
flacdsp_template.c
s0
#define s0
Definition: regdef.h:37
ff_flacdsp_init_riscv
void ff_flacdsp_init_riscv(FLACDSPContext *c, enum AVSampleFormat fmt, int channels)
Definition: flacdsp_init.c:63
d
d
Definition: ffmpeg_filter.c:424
int32_t
int32_t
Definition: audioconvert.c:56
AV_SAMPLE_FMT_S32
@ AV_SAMPLE_FMT_S32
signed 32 bits
Definition: samplefmt.h:59
FLACDSPContext
Definition: flacdsp.h:26