FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
af_tremolo.c
Go to the documentation of this file.
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;
31  int index;
33 
34 #define OFFSET(x) offsetof(TremoloContext, x)
35 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
36 
37 static const AVOption tremolo_options[] = {
38  { "f", "set frequency in hertz", OFFSET(freq), AV_OPT_TYPE_DOUBLE, {.dbl = 5.0}, 0.1, 20000.0, FLAGS },
39  { "d", "set depth as percentage", OFFSET(depth), AV_OPT_TYPE_DOUBLE, {.dbl = 0.5}, 0.0, 1.0, FLAGS },
40  { NULL }
41 };
42 
43 AVFILTER_DEFINE_CLASS(tremolo);
44 
45 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
46 {
47  AVFilterContext *ctx = inlink->dst;
48  AVFilterLink *outlink = ctx->outputs[0];
49  TremoloContext *s = ctx->priv;
50  const double *src = (const double *)in->data[0];
51  const int channels = inlink->channels;
52  const int nb_samples = in->nb_samples;
53  AVFrame *out;
54  double *dst;
55  int n, c;
56 
57  if (av_frame_is_writable(in)) {
58  out = in;
59  } else {
60  out = ff_get_audio_buffer(outlink, in->nb_samples);
61  if (!out) {
62  av_frame_free(&in);
63  return AVERROR(ENOMEM);
64  }
66  }
67  dst = (double *)out->data[0];
68 
69  for (n = 0; n < nb_samples; n++) {
70  for (c = 0; c < channels; c++)
71  dst[c] = src[c] * s->table[s->index];
72  dst += channels;
73  src += channels;
74  s->index++;
75  if (s->index >= inlink->sample_rate / s->freq)
76  s->index = 0;
77  }
78 
79  if (in != out)
80  av_frame_free(&in);
81 
82  return ff_filter_frame(outlink, out);
83 }
84 
86 {
89  static const enum AVSampleFormat sample_fmts[] = {
92  };
93  int ret;
94 
95  layouts = ff_all_channel_counts();
96  if (!layouts)
97  return AVERROR(ENOMEM);
98  ret = ff_set_common_channel_layouts(ctx, layouts);
99  if (ret < 0)
100  return ret;
101 
102  formats = ff_make_format_list(sample_fmts);
103  if (!formats)
104  return AVERROR(ENOMEM);
105  ret = ff_set_common_formats(ctx, formats);
106  if (ret < 0)
107  return ret;
108 
109  formats = ff_all_samplerates();
110  if (!formats)
111  return AVERROR(ENOMEM);
112  return ff_set_common_samplerates(ctx, formats);
113 }
114 
116 {
117  TremoloContext *s = ctx->priv;
118  av_freep(&s->table);
119 }
120 
121 static int config_input(AVFilterLink *inlink)
122 {
123  AVFilterContext *ctx = inlink->dst;
124  TremoloContext *s = ctx->priv;
125  const double offset = 1. - s->depth / 2.;
126  int i;
127 
128  s->table = av_malloc_array(inlink->sample_rate / s->freq, sizeof(*s->table));
129  if (!s->table)
130  return AVERROR(ENOMEM);
131 
132  for (i = 0; i < inlink->sample_rate / s->freq; i++) {
133  double env = s->freq * i / inlink->sample_rate;
134  env = sin(2 * M_PI * fmod(env + 0.25, 1.0));
135  s->table[i] = env * (1 - fabs(offset)) + offset;
136  }
137 
138  s->index = 0;
139 
140  return 0;
141 }
142 
144  {
145  .name = "default",
146  .type = AVMEDIA_TYPE_AUDIO,
147  .config_props = config_input,
148  .filter_frame = filter_frame,
149  },
150  { NULL }
151 };
152 
154  {
155  .name = "default",
156  .type = AVMEDIA_TYPE_AUDIO,
157  },
158  { NULL }
159 };
160 
162  .name = "tremolo",
163  .description = NULL_IF_CONFIG_SMALL("Apply tremolo effect."),
164  .priv_size = sizeof(TremoloContext),
165  .priv_class = &tremolo_class,
166  .uninit = uninit,
168  .inputs = avfilter_af_tremolo_inputs,
169  .outputs = avfilter_af_tremolo_outputs,
170 };
#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:549
This structure describes decoded (raw) audio or video data.
Definition: frame.h:226
AVOption.
Definition: opt.h:246
Main libavfilter public API header.
channels
Definition: aptx.c:30
#define src
Definition: vp8dsp.c:254
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:283
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:1080
#define av_cold
Definition: attributes.h:82
AVOptions.
#define FLAGS
Definition: af_tremolo.c:35
#define OFFSET(x)
Definition: af_tremolo.c:34
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_tremolo.c:115
A filter pad used for either input or output.
Definition: internal.h:54
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:568
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:202
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
void * priv
private data for use by the filter
Definition: avfilter.h:353
static const AVOption tremolo_options[]
Definition: af_tremolo.c:37
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
AVFormatContext * ctx
Definition: movenc.c:48
double * table
Definition: af_tremolo.c:30
#define s(width, name)
Definition: cbs_vp9.c:257
int n
Definition: avisynth_c.h:684
static int query_formats(AVFilterContext *ctx)
Definition: af_tremolo.c:85
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:594
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: af_tremolo.c:45
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
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:395
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:240
static const AVFilterPad avfilter_af_tremolo_inputs[]
Definition: af_tremolo.c:143
static const AVFilterPad avfilter_af_tremolo_outputs[]
Definition: af_tremolo.c:153
AVFilter ff_af_tremolo
Definition: af_tremolo.c:161
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:701
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:410
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:292
static int config_input(AVFilterLink *inlink)
Definition: af_tremolo.c:121
for(j=16;j >0;--j)
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:556
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:654