FFmpeg
af_apulsator.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen and others
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/avassert.h"
22 #include "libavutil/channel_layout.h"
23 #include "libavutil/opt.h"
24 #include "avfilter.h"
25 #include "formats.h"
26 #include "internal.h"
27 #include "audio.h"
28 
29 enum PulsatorModes { SINE, TRIANGLE, SQUARE, SAWUP, SAWDOWN, NB_MODES };
30 enum PulsatorTimings { UNIT_BPM, UNIT_MS, UNIT_HZ, NB_TIMINGS };
31 
32 typedef struct SimpleLFO {
33  double phase;
34  double freq;
35  double offset;
36  double amount;
37  double pwidth;
38  int mode;
39  int srate;
40 } SimpleLFO;
41 
42 typedef struct AudioPulsatorContext {
43  const AVClass *class;
44  int mode;
45  double level_in;
46  double level_out;
47  double amount;
48  double offset_l;
49  double offset_r;
50  double pwidth;
51  double bpm;
52  double hertz;
53  int ms;
54  int timing;
55 
56  SimpleLFO lfoL, lfoR;
57 } AudioPulsatorContext;
58 
59 #define OFFSET(x) offsetof(AudioPulsatorContext, x)
60 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
61 
62 static const AVOption apulsator_options[] = {
63  { "level_in", "set input gain", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, FLAGS, },
64  { "level_out", "set output gain", OFFSET(level_out), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, FLAGS, },
65  { "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=SINE}, SINE, NB_MODES-1, FLAGS, "mode" },
66  { "sine", NULL, 0, AV_OPT_TYPE_CONST, {.i64=SINE}, 0, 0, FLAGS, "mode" },
67  { "triangle", NULL, 0, AV_OPT_TYPE_CONST, {.i64=TRIANGLE},0, 0, FLAGS, "mode" },
68  { "square", NULL, 0, AV_OPT_TYPE_CONST, {.i64=SQUARE}, 0, 0, FLAGS, "mode" },
69  { "sawup", NULL, 0, AV_OPT_TYPE_CONST, {.i64=SAWUP}, 0, 0, FLAGS, "mode" },
70  { "sawdown", NULL, 0, AV_OPT_TYPE_CONST, {.i64=SAWDOWN}, 0, 0, FLAGS, "mode" },
71  { "amount", "set modulation", OFFSET(amount), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
72  { "offset_l", "set offset L", OFFSET(offset_l), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
73  { "offset_r", "set offset R", OFFSET(offset_r), AV_OPT_TYPE_DOUBLE, {.dbl=.5}, 0, 1, FLAGS },
74  { "width", "set pulse width", OFFSET(pwidth), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 2, FLAGS },
75  { "timing", "set timing", OFFSET(timing), AV_OPT_TYPE_INT, {.i64=2}, 0, NB_TIMINGS-1, FLAGS, "timing" },
76  { "bpm", NULL, 0, AV_OPT_TYPE_CONST, {.i64=UNIT_BPM}, 0, 0, FLAGS, "timing" },
77  { "ms", NULL, 0, AV_OPT_TYPE_CONST, {.i64=UNIT_MS}, 0, 0, FLAGS, "timing" },
78  { "hz", NULL, 0, AV_OPT_TYPE_CONST, {.i64=UNIT_HZ}, 0, 0, FLAGS, "timing" },
79  { "bpm", "set BPM", OFFSET(bpm), AV_OPT_TYPE_DOUBLE, {.dbl=120}, 30, 300, FLAGS },
80  { "ms", "set ms", OFFSET(ms), AV_OPT_TYPE_INT, {.i64=500}, 10, 2000, FLAGS },
81  { "hz", "set frequency", OFFSET(hertz), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0.01, 100, FLAGS },
82  { NULL }
83 };
84 
85 AVFILTER_DEFINE_CLASS(apulsator);
86 
87 static void lfo_advance(SimpleLFO *lfo, unsigned count)
88 {
89  lfo->phase = fabs(lfo->phase + count * lfo->freq / lfo->srate);
90  if (lfo->phase >= 1)
91  lfo->phase = fmod(lfo->phase, 1);
92 }
93 
94 static double lfo_get_value(SimpleLFO *lfo)
95 {
96  double phs = FFMIN(100, lfo->phase / FFMIN(1.99, FFMAX(0.01, lfo->pwidth)) + lfo->offset);
97  double val;
98 
99  if (phs > 1)
100  phs = fmod(phs, 1.);
101 
102  switch (lfo->mode) {
103  case SINE:
104  val = sin(phs * 2 * M_PI);
105  break;
106  case TRIANGLE:
107  if (phs > 0.75)
108  val = (phs - 0.75) * 4 - 1;
109  else if (phs > 0.25)
110  val = -4 * phs + 2;
111  else
112  val = phs * 4;
113  break;
114  case SQUARE:
115  val = phs < 0.5 ? -1 : +1;
116  break;
117  case SAWUP:
118  val = phs * 2 - 1;
119  break;
120  case SAWDOWN:
121  val = 1 - phs * 2;
122  break;
123  default: av_assert0(0);
124  }
125 
126  return val * lfo->amount;
127 }
128 
129 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
130 {
131  AVFilterContext *ctx = inlink->dst;
132  AVFilterLink *outlink = ctx->outputs[0];
133  AudioPulsatorContext *s = ctx->priv;
134  const double *src = (const double *)in->data[0];
135  const int nb_samples = in->nb_samples;
136  const double level_out = s->level_out;
137  const double level_in = s->level_in;
138  const double amount = s->amount;
139  AVFrame *out;
140  double *dst;
141  int n;
142 
143  if (av_frame_is_writable(in)) {
144  out = in;
145  } else {
146  out = ff_get_audio_buffer(inlink, in->nb_samples);
147  if (!out) {
148  av_frame_free(&in);
149  return AVERROR(ENOMEM);
150  }
151  av_frame_copy_props(out, in);
152  }
153  dst = (double *)out->data[0];
154 
155  for (n = 0; n < nb_samples; n++) {
156  double outL;
157  double outR;
158  double inL = src[0] * level_in;
159  double inR = src[1] * level_in;
160  double procL = inL;
161  double procR = inR;
162 
163  procL *= lfo_get_value(&s->lfoL) * 0.5 + amount / 2;
164  procR *= lfo_get_value(&s->lfoR) * 0.5 + amount / 2;
165 
166  outL = procL + inL * (1 - amount);
167  outR = procR + inR * (1 - amount);
168 
169  outL *= level_out;
170  outR *= level_out;
171 
172  dst[0] = outL;
173  dst[1] = outR;
174 
175  lfo_advance(&s->lfoL, 1);
176  lfo_advance(&s->lfoR, 1);
177 
178  dst += 2;
179  src += 2;
180  }
181 
182  if (in != out)
183  av_frame_free(&in);
184 
185  return ff_filter_frame(outlink, out);
186 }
187 
188 static int query_formats(AVFilterContext *ctx)
189 {
190  AVFilterChannelLayouts *layout = NULL;
191  AVFilterFormats *formats = NULL;
192  int ret;
193 
194  if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_DBL )) < 0 ||
195  (ret = ff_set_common_formats (ctx , formats )) < 0 ||
196  (ret = ff_add_channel_layout (&layout , &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO)) < 0 ||
197  (ret = ff_set_common_channel_layouts (ctx , layout )) < 0)
198  return ret;
199 
200  return ff_set_common_all_samplerates(ctx);
201 }
202 
203 static int config_input(AVFilterLink *inlink)
204 {
205  AVFilterContext *ctx = inlink->dst;
206  AudioPulsatorContext *s = ctx->priv;
207  double freq;
208 
209  switch (s->timing) {
210  case UNIT_BPM: freq = s->bpm / 60; break;
211  case UNIT_MS: freq = 1 / (s->ms / 1000.); break;
212  case UNIT_HZ: freq = s->hertz; break;
213  default: av_assert0(0);
214  }
215 
216  s->lfoL.freq = freq;
217  s->lfoR.freq = freq;
218  s->lfoL.mode = s->mode;
219  s->lfoR.mode = s->mode;
220  s->lfoL.offset = s->offset_l;
221  s->lfoR.offset = s->offset_r;
222  s->lfoL.srate = inlink->sample_rate;
223  s->lfoR.srate = inlink->sample_rate;
224  s->lfoL.amount = s->amount;
225  s->lfoR.amount = s->amount;
226  s->lfoL.pwidth = s->pwidth;
227  s->lfoR.pwidth = s->pwidth;
228 
229  return 0;
230 }
231 
232 static const AVFilterPad inputs[] = {
233  {
234  .name = "default",
235  .type = AVMEDIA_TYPE_AUDIO,
236  .config_props = config_input,
237  .filter_frame = filter_frame,
238  },
239 };
240 
241 const AVFilter ff_af_apulsator = {
242  .name = "apulsator",
243  .description = NULL_IF_CONFIG_SMALL("Audio pulsator."),
244  .priv_size = sizeof(AudioPulsatorContext),
245  .priv_class = &apulsator_class,
246  FILTER_INPUTS(inputs),
247  FILTER_OUTPUTS(ff_audio_default_filterpad),
248  FILTER_QUERY_FUNC(query_formats),
249 };
formats
formats
Definition: signature.h:48
ff_get_audio_buffer
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
Definition: audio.c:107
AVFilterChannelLayouts
A list of supported channel layouts.
Definition: formats.h:85
SQUARE
@ SQUARE
Definition: af_apulsator.c:29
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
out
FILE * out
Definition: movenc.c:54
AV_CHANNEL_LAYOUT_STEREO
#define AV_CHANNEL_LAYOUT_STEREO
Definition: channel_layout.h:383
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:978
AudioPulsatorContext
Definition: af_apulsator.c:42
inlink
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
Definition: filter_design.txt:212
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:100
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
AVOption
AVOption.
Definition: opt.h:251
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:169
ff_set_common_all_samplerates
int ff_set_common_all_samplerates(AVFilterContext *ctx)
Equivalent to ff_set_common_samplerates(ctx, ff_all_samplerates())
Definition: formats.c:760
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AudioPulsatorContext::timing
int timing
Definition: af_apulsator.c:54
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
SimpleLFO::phase
double phase
Definition: af_apulsator.c:33
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:361
UNIT_BPM
@ UNIT_BPM
Definition: af_apulsator.c:30
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:64
formats.h
lfo_advance
static void lfo_advance(SimpleLFO *lfo, unsigned count)
Definition: af_apulsator.c:87
apulsator_options
static const AVOption apulsator_options[]
Definition: af_apulsator.c:62
val
static double val(void *priv, double ch)
Definition: aeval.c:78
SimpleLFO::srate
int srate
Definition: af_apulsator.c:39
AudioPulsatorContext::bpm
double bpm
Definition: af_apulsator.c:51
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:47
avassert.h
UNIT_MS
@ UNIT_MS
Definition: af_apulsator.c:30
ff_set_common_formats
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:770
SimpleLFO::pwidth
double pwidth
Definition: af_apulsator.c:37
s
#define s(width, name)
Definition: cbs_vp9.c:198
NB_TIMINGS
@ NB_TIMINGS
Definition: af_apulsator.c:30
AudioPulsatorContext::level_out
double level_out
Definition: af_apulsator.c:46
PulsatorTimings
PulsatorTimings
Definition: af_apulsator.c:30
AV_OPT_TYPE_DOUBLE
@ AV_OPT_TYPE_DOUBLE
Definition: opt.h:227
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: af_apulsator.c:129
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: af_apulsator.c:188
ctx
AVFormatContext * ctx
Definition: movenc.c:48
SimpleLFO
Definition: af_apulsator.c:32
AudioPulsatorContext::lfoL
SimpleLFO lfoL
Definition: af_apulsator.c:56
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:192
if
if(ret)
Definition: filter_design.txt:179
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
fabs
static __device__ float fabs(float a)
Definition: cuda_runtime.h:182
NULL
#define NULL
Definition: coverity.c:32
av_frame_copy_props
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:736
AudioPulsatorContext::amount
double amount
Definition: af_apulsator.c:47
ff_add_format
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:470
ff_audio_default_filterpad
const AVFilterPad ff_audio_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_AUDIO.
Definition: audio.c:32
TRIANGLE
@ TRIANGLE
Definition: af_apulsator.c:29
PulsatorModes
PulsatorModes
Definition: af_apulsator.c:29
ff_add_channel_layout
int ff_add_channel_layout(AVFilterChannelLayouts **l, const AVChannelLayout *channel_layout)
Definition: formats.c:487
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(apulsator)
AudioPulsatorContext::hertz
double hertz
Definition: af_apulsator.c:52
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:106
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:307
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
SAWUP
@ SAWUP
Definition: af_apulsator.c:29
AudioPulsatorContext::lfoR
SimpleLFO lfoR
Definition: af_apulsator.c:56
UNIT_HZ
@ UNIT_HZ
Definition: af_apulsator.c:30
av_frame_is_writable
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:666
FLAGS
#define FLAGS
Definition: af_apulsator.c:60
M_PI
#define M_PI
Definition: mathematics.h:67
internal.h
AudioPulsatorContext::level_in
double level_in
Definition: af_apulsator.c:45
SimpleLFO::freq
double freq
Definition: af_apulsator.c:34
layout
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel layout
Definition: filter_design.txt:18
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:420
lfo_get_value
static double lfo_get_value(SimpleLFO *lfo)
Definition: af_apulsator.c:94
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:53
SimpleLFO::mode
int mode
Definition: af_apulsator.c:38
AVFilter
Filter definition.
Definition: avfilter.h:166
config_input
static int config_input(AVFilterLink *inlink)
Definition: af_apulsator.c:203
AudioPulsatorContext::pwidth
double pwidth
Definition: af_apulsator.c:50
ret
ret
Definition: filter_design.txt:187
NB_MODES
@ NB_MODES
Definition: af_apulsator.c:29
SINE
@ SINE
Definition: af_apulsator.c:29
AudioPulsatorContext::ms
int ms
Definition: af_apulsator.c:53
SimpleLFO::offset
double offset
Definition: af_apulsator.c:35
channel_layout.h
SAWDOWN
@ SAWDOWN
Definition: af_apulsator.c:29
ff_af_apulsator
const AVFilter ff_af_apulsator
Definition: af_apulsator.c:241
mode
mode
Definition: ebur128.h:83
OFFSET
#define OFFSET(x)
Definition: af_apulsator.c:59
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
avfilter.h
AudioPulsatorContext::mode
int mode
Definition: af_apulsator.c:44
AVFilterContext
An instance of a filter.
Definition: avfilter.h:397
audio.h
AudioPulsatorContext::offset_r
double offset_r
Definition: af_apulsator.c:49
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:193
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
inputs
static const AVFilterPad inputs[]
Definition: af_apulsator.c:232
SimpleLFO::amount
double amount
Definition: af_apulsator.c:36
AV_SAMPLE_FMT_DBL
@ AV_SAMPLE_FMT_DBL
double
Definition: samplefmt.h:61
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:234
AudioPulsatorContext::offset_l
double offset_l
Definition: af_apulsator.c:48
ff_set_common_channel_layouts
int ff_set_common_channel_layouts(AVFilterContext *ctx, AVFilterChannelLayouts *channel_layouts)
Helpers for query_formats() which set all free audio links to the same list of channel layouts/sample...
Definition: formats.c:729
Generated on Thu Apr 18 2024 22:42:19 for FFmpeg by   doxygen 1.8.17