FFmpeg  4.3.8
af_tremolo.c
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1 /*
2  * Copyright (c) 2015 Kyle Swanson <k@ylo.ph>.
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/opt.h"
22 #include "avfilter.h"
23 #include "internal.h"
24 #include "audio.h"
25 
26 typedef struct TremoloContext {
27  const AVClass *class;
28  double freq;
29  double depth;
30  double *table;
32  int index;
34 
35 #define OFFSET(x) offsetof(TremoloContext, x)
36 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
37 
38 static const AVOption tremolo_options[] = {
39  { "f", "set frequency in hertz", OFFSET(freq), AV_OPT_TYPE_DOUBLE, {.dbl = 5.0}, 0.1, 20000.0, FLAGS },
40  { "d", "set depth as percentage", OFFSET(depth), AV_OPT_TYPE_DOUBLE, {.dbl = 0.5}, 0.0, 1.0, FLAGS },
41  { NULL }
42 };
43 
44 AVFILTER_DEFINE_CLASS(tremolo);
45 
46 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
47 {
48  AVFilterContext *ctx = inlink->dst;
49  AVFilterLink *outlink = ctx->outputs[0];
50  TremoloContext *s = ctx->priv;
51  const double *src = (const double *)in->data[0];
52  const int channels = inlink->channels;
53  const int nb_samples = in->nb_samples;
54  AVFrame *out;
55  double *dst;
56  int n, c;
57 
58  if (av_frame_is_writable(in)) {
59  out = in;
60  } else {
61  out = ff_get_audio_buffer(outlink, in->nb_samples);
62  if (!out) {
63  av_frame_free(&in);
64  return AVERROR(ENOMEM);
65  }
67  }
68  dst = (double *)out->data[0];
69 
70  for (n = 0; n < nb_samples; n++) {
71  for (c = 0; c < channels; c++)
72  dst[c] = src[c] * s->table[s->index];
73  dst += channels;
74  src += channels;
75  s->index++;
76  if (s->index >= s->table_size)
77  s->index = 0;
78  }
79 
80  if (in != out)
81  av_frame_free(&in);
82 
83  return ff_filter_frame(outlink, out);
84 }
85 
87 {
90  static const enum AVSampleFormat sample_fmts[] = {
93  };
94  int ret;
95 
96  layouts = ff_all_channel_counts();
97  if (!layouts)
98  return AVERROR(ENOMEM);
99  ret = ff_set_common_channel_layouts(ctx, layouts);
100  if (ret < 0)
101  return ret;
102 
103  formats = ff_make_format_list(sample_fmts);
104  if (!formats)
105  return AVERROR(ENOMEM);
106  ret = ff_set_common_formats(ctx, formats);
107  if (ret < 0)
108  return ret;
109 
110  formats = ff_all_samplerates();
111  if (!formats)
112  return AVERROR(ENOMEM);
113  return ff_set_common_samplerates(ctx, formats);
114 }
115 
117 {
118  TremoloContext *s = ctx->priv;
119  av_freep(&s->table);
120 }
121 
122 static int config_input(AVFilterLink *inlink)
123 {
124  AVFilterContext *ctx = inlink->dst;
125  TremoloContext *s = ctx->priv;
126  const double offset = 1. - s->depth / 2.;
127  int i;
128 
129  s->table_size = inlink->sample_rate / s->freq;
130  s->table = av_malloc_array(s->table_size, sizeof(*s->table));
131  if (!s->table)
132  return AVERROR(ENOMEM);
133 
134  for (i = 0; i < s->table_size; i++) {
135  double env = s->freq * i / inlink->sample_rate;
136  env = sin(2 * M_PI * fmod(env + 0.25, 1.0));
137  s->table[i] = env * (1 - fabs(offset)) + offset;
138  }
139 
140  s->index = 0;
141 
142  return 0;
143 }
144 
146  {
147  .name = "default",
148  .type = AVMEDIA_TYPE_AUDIO,
149  .config_props = config_input,
150  .filter_frame = filter_frame,
151  },
152  { NULL }
153 };
154 
156  {
157  .name = "default",
158  .type = AVMEDIA_TYPE_AUDIO,
159  },
160  { NULL }
161 };
162 
164  .name = "tremolo",
165  .description = NULL_IF_CONFIG_SMALL("Apply tremolo effect."),
166  .priv_size = sizeof(TremoloContext),
167  .priv_class = &tremolo_class,
168  .uninit = uninit,
170  .inputs = avfilter_af_tremolo_inputs,
171  .outputs = avfilter_af_tremolo_outputs,
172 };
#define NULL
Definition: coverity.c:32
int ff_set_common_channel_layouts(AVFilterContext *ctx, AVFilterChannelLayouts *layouts)
A helper for query_formats() which sets all links to the same list of channel layouts/sample rates...
Definition: formats.c:586
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
AVOption.
Definition: opt.h:246
Main libavfilter public API header.
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:300
const char * name
Pad name.
Definition: internal.h:60
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1075
#define av_cold
Definition: attributes.h:88
AVOptions.
#define FLAGS
Definition: af_tremolo.c:36
#define OFFSET(x)
Definition: af_tremolo.c:35
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_tremolo.c:116
channels
Definition: aptx.h:33
A filter pad used for either input or output.
Definition: internal.h:54
#define src
Definition: vp8dsp.c:254
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
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:605
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
Definition: audio.c:86
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
void * priv
private data for use by the filter
Definition: avfilter.h:353
static const AVOption tremolo_options[]
Definition: af_tremolo.c:38
static const uint8_t offset[127][2]
Definition: vf_spp.c:93
AVFormatContext * ctx
Definition: movenc.c:48
double * table
Definition: af_tremolo.c:30
#define s(width, name)
Definition: cbs_vp9.c:257
static int query_formats(AVFilterContext *ctx)
Definition: af_tremolo.c:86
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
double depth
Definition: af_tremolo.c:29
A list of supported channel layouts.
Definition: formats.h:85
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:595
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: af_tremolo.c:46
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)\", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
const char * name
Filter name.
Definition: avfilter.h:148
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:439
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
static const AVFilterPad avfilter_af_tremolo_inputs[]
Definition: af_tremolo.c:145
static const AVFilterPad avfilter_af_tremolo_outputs[]
Definition: af_tremolo.c:155
AVFilter ff_af_tremolo
Definition: af_tremolo.c:163
if(ret< 0)
Definition: vf_mcdeint.c:279
AVFILTER_DEFINE_CLASS(tremolo)
static double c[64]
A list of supported formats for one end of a filter link.
Definition: formats.h:64
An instance of a filter.
Definition: avfilter.h:338
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:731
FILE * out
Definition: movenc.c:54
#define av_freep(p)
#define M_PI
Definition: mathematics.h:52
#define av_malloc_array(a, b)
formats
Definition: signature.h:48
internal API functions
AVFilterChannelLayouts * ff_all_channel_counts(void)
Construct an AVFilterChannelLayouts coding for any channel layout, with known or unknown disposition...
Definition: formats.c:454
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:366
static int config_input(AVFilterLink *inlink)
Definition: af_tremolo.c:122
for(j=16;j >0;--j)
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:593
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:659