1 |
|
|
/* |
2 |
|
|
* Copyright (c) 2008 Rob Sykes |
3 |
|
|
* Copyright (c) 2017 Paul B Mahol |
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 "libavutil/channel_layout.h" |
23 |
|
|
#include "libavutil/opt.h" |
24 |
|
|
#include "avfilter.h" |
25 |
|
|
#include "audio.h" |
26 |
|
|
#include "formats.h" |
27 |
|
|
|
28 |
|
|
typedef struct AudioContrastContext { |
29 |
|
|
const AVClass *class; |
30 |
|
|
float contrast; |
31 |
|
|
void (*filter)(void **dst, const void **src, |
32 |
|
|
int nb_samples, int channels, float contrast); |
33 |
|
|
} AudioContrastContext; |
34 |
|
|
|
35 |
|
|
#define OFFSET(x) offsetof(AudioContrastContext, x) |
36 |
|
|
#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
37 |
|
|
|
38 |
|
|
static const AVOption acontrast_options[] = { |
39 |
|
|
{ "contrast", "set contrast", OFFSET(contrast), AV_OPT_TYPE_FLOAT, {.dbl=33}, 0, 100, A }, |
40 |
|
|
{ NULL } |
41 |
|
|
}; |
42 |
|
|
|
43 |
|
|
AVFILTER_DEFINE_CLASS(acontrast); |
44 |
|
|
|
45 |
|
|
static int query_formats(AVFilterContext *ctx) |
46 |
|
|
{ |
47 |
|
|
AVFilterFormats *formats = NULL; |
48 |
|
|
AVFilterChannelLayouts *layouts = NULL; |
49 |
|
|
static const enum AVSampleFormat sample_fmts[] = { |
50 |
|
|
AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP, |
51 |
|
|
AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP, |
52 |
|
|
AV_SAMPLE_FMT_NONE |
53 |
|
|
}; |
54 |
|
|
int ret; |
55 |
|
|
|
56 |
|
|
formats = ff_make_format_list(sample_fmts); |
57 |
|
|
if (!formats) |
58 |
|
|
return AVERROR(ENOMEM); |
59 |
|
|
ret = ff_set_common_formats(ctx, formats); |
60 |
|
|
if (ret < 0) |
61 |
|
|
return ret; |
62 |
|
|
|
63 |
|
|
layouts = ff_all_channel_counts(); |
64 |
|
|
if (!layouts) |
65 |
|
|
return AVERROR(ENOMEM); |
66 |
|
|
|
67 |
|
|
ret = ff_set_common_channel_layouts(ctx, layouts); |
68 |
|
|
if (ret < 0) |
69 |
|
|
return ret; |
70 |
|
|
|
71 |
|
|
formats = ff_all_samplerates(); |
72 |
|
|
return ff_set_common_samplerates(ctx, formats); |
73 |
|
|
} |
74 |
|
|
|
75 |
|
|
static void filter_flt(void **d, const void **s, |
76 |
|
|
int nb_samples, int channels, |
77 |
|
|
float contrast) |
78 |
|
|
{ |
79 |
|
|
const float *src = s[0]; |
80 |
|
|
float *dst = d[0]; |
81 |
|
|
int n, c; |
82 |
|
|
|
83 |
|
|
for (n = 0; n < nb_samples; n++) { |
84 |
|
|
for (c = 0; c < channels; c++) { |
85 |
|
|
float d = src[c] * M_PI_2; |
86 |
|
|
|
87 |
|
|
dst[c] = sinf(d + contrast * sinf(d * 4)); |
88 |
|
|
} |
89 |
|
|
|
90 |
|
|
dst += c; |
91 |
|
|
src += c; |
92 |
|
|
} |
93 |
|
|
} |
94 |
|
|
|
95 |
|
|
static void filter_dbl(void **d, const void **s, |
96 |
|
|
int nb_samples, int channels, |
97 |
|
|
float contrast) |
98 |
|
|
{ |
99 |
|
|
const double *src = s[0]; |
100 |
|
|
double *dst = d[0]; |
101 |
|
|
int n, c; |
102 |
|
|
|
103 |
|
|
for (n = 0; n < nb_samples; n++) { |
104 |
|
|
for (c = 0; c < channels; c++) { |
105 |
|
|
double d = src[c] * M_PI_2; |
106 |
|
|
|
107 |
|
|
dst[c] = sin(d + contrast * sin(d * 4)); |
108 |
|
|
} |
109 |
|
|
|
110 |
|
|
dst += c; |
111 |
|
|
src += c; |
112 |
|
|
} |
113 |
|
|
} |
114 |
|
|
|
115 |
|
|
static void filter_fltp(void **d, const void **s, |
116 |
|
|
int nb_samples, int channels, |
117 |
|
|
float contrast) |
118 |
|
|
{ |
119 |
|
|
int n, c; |
120 |
|
|
|
121 |
|
|
for (c = 0; c < channels; c++) { |
122 |
|
|
const float *src = s[c]; |
123 |
|
|
float *dst = d[c]; |
124 |
|
|
|
125 |
|
|
for (n = 0; n < nb_samples; n++) { |
126 |
|
|
float d = src[n] * M_PI_2; |
127 |
|
|
|
128 |
|
|
dst[n] = sinf(d + contrast * sinf(d * 4)); |
129 |
|
|
} |
130 |
|
|
} |
131 |
|
|
} |
132 |
|
|
|
133 |
|
|
static void filter_dblp(void **d, const void **s, |
134 |
|
|
int nb_samples, int channels, |
135 |
|
|
float contrast) |
136 |
|
|
{ |
137 |
|
|
int n, c; |
138 |
|
|
|
139 |
|
|
for (c = 0; c < channels; c++) { |
140 |
|
|
const double *src = s[c]; |
141 |
|
|
double *dst = d[c]; |
142 |
|
|
|
143 |
|
|
for (n = 0; n < nb_samples; n++) { |
144 |
|
|
double d = src[n] * M_PI_2; |
145 |
|
|
|
146 |
|
|
dst[n] = sin(d + contrast * sin(d * 4)); |
147 |
|
|
} |
148 |
|
|
} |
149 |
|
|
} |
150 |
|
|
|
151 |
|
|
static int config_input(AVFilterLink *inlink) |
152 |
|
|
{ |
153 |
|
|
AVFilterContext *ctx = inlink->dst; |
154 |
|
|
AudioContrastContext *s = ctx->priv; |
155 |
|
|
|
156 |
|
|
switch (inlink->format) { |
157 |
|
|
case AV_SAMPLE_FMT_FLT: s->filter = filter_flt; break; |
158 |
|
|
case AV_SAMPLE_FMT_DBL: s->filter = filter_dbl; break; |
159 |
|
|
case AV_SAMPLE_FMT_FLTP: s->filter = filter_fltp; break; |
160 |
|
|
case AV_SAMPLE_FMT_DBLP: s->filter = filter_dblp; break; |
161 |
|
|
} |
162 |
|
|
|
163 |
|
|
return 0; |
164 |
|
|
} |
165 |
|
|
|
166 |
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
167 |
|
|
{ |
168 |
|
|
AVFilterContext *ctx = inlink->dst; |
169 |
|
|
AVFilterLink *outlink = ctx->outputs[0]; |
170 |
|
|
AudioContrastContext *s = ctx->priv; |
171 |
|
|
AVFrame *out; |
172 |
|
|
|
173 |
|
|
if (av_frame_is_writable(in)) { |
174 |
|
|
out = in; |
175 |
|
|
} else { |
176 |
|
|
out = ff_get_audio_buffer(outlink, in->nb_samples); |
177 |
|
|
if (!out) { |
178 |
|
|
av_frame_free(&in); |
179 |
|
|
return AVERROR(ENOMEM); |
180 |
|
|
} |
181 |
|
|
av_frame_copy_props(out, in); |
182 |
|
|
} |
183 |
|
|
|
184 |
|
|
s->filter((void **)out->extended_data, (const void **)in->extended_data, |
185 |
|
|
in->nb_samples, in->channels, s->contrast / 750); |
186 |
|
|
|
187 |
|
|
if (out != in) |
188 |
|
|
av_frame_free(&in); |
189 |
|
|
|
190 |
|
|
return ff_filter_frame(outlink, out); |
191 |
|
|
} |
192 |
|
|
|
193 |
|
|
static const AVFilterPad inputs[] = { |
194 |
|
|
{ |
195 |
|
|
.name = "default", |
196 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
197 |
|
|
.filter_frame = filter_frame, |
198 |
|
|
.config_props = config_input, |
199 |
|
|
}, |
200 |
|
|
{ NULL } |
201 |
|
|
}; |
202 |
|
|
|
203 |
|
|
static const AVFilterPad outputs[] = { |
204 |
|
|
{ |
205 |
|
|
.name = "default", |
206 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
207 |
|
|
}, |
208 |
|
|
{ NULL } |
209 |
|
|
}; |
210 |
|
|
|
211 |
|
|
AVFilter ff_af_acontrast = { |
212 |
|
|
.name = "acontrast", |
213 |
|
|
.description = NULL_IF_CONFIG_SMALL("Simple audio dynamic range compression/expansion filter."), |
214 |
|
|
.query_formats = query_formats, |
215 |
|
|
.priv_size = sizeof(AudioContrastContext), |
216 |
|
|
.priv_class = &acontrast_class, |
217 |
|
|
.inputs = inputs, |
218 |
|
|
.outputs = outputs, |
219 |
|
|
}; |