FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
af_vibrato.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 #include "generate_wave_table.h"
26 
27 typedef struct VibratoContext {
28  const AVClass *class;
29  double freq;
30  double depth;
31  int channels;
32 
33  double **buf;
34  int buf_index;
35  int buf_size;
36 
37  double *wave_table;
41 
42 #define OFFSET(x) offsetof(VibratoContext, x)
43 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
44 
45 static const AVOption vibrato_options[] = {
46  { "f", "set frequency in hertz", OFFSET(freq), AV_OPT_TYPE_DOUBLE, {.dbl = 5.0}, 0.1, 20000.0, FLAGS },
47  { "d", "set depth as percentage", OFFSET(depth), AV_OPT_TYPE_DOUBLE, {.dbl = 0.5}, 0.00, 1.0, FLAGS },
48  { NULL }
49 };
50 
51 AVFILTER_DEFINE_CLASS(vibrato);
52 
53 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
54 {
55  AVFilterContext *ctx = inlink->dst;
56  VibratoContext *s = ctx->priv;
57  AVFilterLink *outlink = ctx->outputs[0];
58  AVFrame *out;
59  int n, c;
60  const double *src;
61  double *dst;
62 
63  if (av_frame_is_writable(in)) {
64  out = in;
65  } else {
66  out = ff_get_audio_buffer(inlink, in->nb_samples);
67  if (!out) {
68  av_frame_free(&in);
69  return AVERROR(ENOMEM);
70  }
71  av_frame_copy_props(out, in);
72  }
73 
74 
75  for (n = 0; n < in->nb_samples; n++) {
76  double integer, decimal;
77  decimal = modf(s->depth * s->wave_table[s->wave_table_index], &integer);
78 
79  s->wave_table_index++;
80  if (s->wave_table_index >= s->wave_table_size)
82 
83  for (c = 0; c < inlink->channels; c++) {
84  int samp1_index, samp2_index;
85  double *buf;
86  double this_samp;
87 
88  src = (const double *)in->extended_data[c];
89  dst = (double *)out->extended_data[c];
90  buf = s->buf[c];
91 
92  samp1_index = s->buf_index + integer;
93  if (samp1_index >= s->buf_size)
94  samp1_index -= s->buf_size;
95  samp2_index = samp1_index + 1;
96  if (samp2_index >= s->buf_size)
97  samp2_index -= s->buf_size;
98 
99  this_samp = src[n];
100  dst[n] = buf[samp1_index] + (decimal * (buf[samp2_index] - buf[samp1_index]));
101  buf[s->buf_index] = this_samp;
102  }
103  s->buf_index++;
104  if (s->buf_index >= s->buf_size)
105  s->buf_index -= s->buf_size;
106  }
107 
108  if (in != out)
109  av_frame_free(&in);
110 
111  return ff_filter_frame(outlink, out);
112 }
113 
115 {
118  static const enum AVSampleFormat sample_fmts[] = {
121  };
122  int ret;
123 
124  layouts = ff_all_channel_counts();
125  if (!layouts)
126  return AVERROR(ENOMEM);
127  ret = ff_set_common_channel_layouts(ctx, layouts);
128  if (ret < 0)
129  return ret;
130 
131  formats = ff_make_format_list(sample_fmts);
132  if (!formats)
133  return AVERROR(ENOMEM);
134  ret = ff_set_common_formats(ctx, formats);
135  if (ret < 0)
136  return ret;
137 
138  formats = ff_all_samplerates();
139  if (!formats)
140  return AVERROR(ENOMEM);
141  return ff_set_common_samplerates(ctx, formats);
142 }
143 
145 {
146  VibratoContext *s = ctx->priv;
147  int c;
148 
149  av_freep(&s->wave_table);
150  for (c = 0; c < s->channels; c++)
151  av_freep(&s->buf[c]);
152  av_freep(&s->buf);
153 }
154 
155 static int config_input(AVFilterLink *inlink)
156 {
157  int c;
158  AVFilterContext *ctx = inlink->dst;
159  VibratoContext *s = ctx->priv;
160  s->channels = inlink->channels;
161 
162  s->buf = av_calloc(inlink->channels, sizeof(*s->buf));
163  if (!s->buf)
164  return AVERROR(ENOMEM);
165  s->buf_size = inlink->sample_rate * 0.005;
166  for (c = 0; c < s->channels; c++) {
167  s->buf[c] = av_malloc_array(s->buf_size, sizeof(*s->buf[c]));
168  if (!s->buf[c])
169  return AVERROR(ENOMEM);
170  }
171  s->buf_index = 0;
172 
173  s->wave_table_size = inlink->sample_rate / s->freq;
175  if (!s->wave_table)
176  return AVERROR(ENOMEM);
178  s->wave_table_index = 0;
179 
180  return 0;
181 }
182 
184  {
185  .name = "default",
186  .type = AVMEDIA_TYPE_AUDIO,
187  .config_props = config_input,
188  .filter_frame = filter_frame,
189  },
190  { NULL }
191 };
192 
194  {
195  .name = "default",
196  .type = AVMEDIA_TYPE_AUDIO,
197  },
198  { NULL }
199 };
200 
202  .name = "vibrato",
203  .description = NULL_IF_CONFIG_SMALL("Apply vibrato effect."),
204  .priv_size = sizeof(VibratoContext),
205  .priv_class = &vibrato_class,
206  .uninit = uninit,
208  .inputs = avfilter_af_vibrato_inputs,
209  .outputs = avfilter_af_vibrato_outputs,
210 };
#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
const char * s
Definition: avisynth_c.h:631
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
AVOption.
Definition: opt.h:245
static const AVFilterPad avfilter_af_vibrato_inputs[]
Definition: af_vibrato.c:183
Main libavfilter public API header.
double depth
Definition: af_vibrato.c:30
static enum AVSampleFormat formats[]
Definition: avresample.c:163
static int query_formats(AVFilterContext *ctx)
Definition: af_vibrato.c:114
double, planar
Definition: samplefmt.h:70
int wave_table_size
Definition: af_vibrato.c:39
static const AVOption vibrato_options[]
Definition: af_vibrato.c:45
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_vibrato.c:144
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:59
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1180
#define av_cold
Definition: attributes.h:82
AVOptions.
#define FLAGS
Definition: af_vibrato.c:43
double ** buf
Definition: af_vibrato.c:33
AVFilter ff_af_vibrato
Definition: af_vibrato.c:201
A filter pad used for either input or output.
Definition: internal.h:53
static int config_input(AVFilterLink *inlink)
Definition: af_vibrato.c:155
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:65
#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:153
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
void * priv
private data for use by the filter
Definition: avfilter.h:320
int depth
Definition: v4l.c:62
#define M_PI_2
Definition: mathematics.h:49
int wave_table_index
Definition: af_vibrato.c:38
AVFormatContext * ctx
Definition: movenc.c:48
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: af_vibrato.c:53
int n
Definition: avisynth_c.h:547
static const AVFilterPad outputs[]
Definition: af_afftfilt.c:386
#define src
Definition: vp9dsp.c:530
void ff_generate_wave_table(enum WaveType wave_type, enum AVSampleFormat sample_fmt, void *table, int table_size, double min, double max, double phase)
A list of supported channel layouts.
Definition: formats.h:85
static const AVFilterPad inputs[]
Definition: af_afftfilt.c:376
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:520
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
void * buf
Definition: avisynth_c.h:553
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:142
const char * name
Filter name.
Definition: avfilter.h:146
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:317
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:395
double * wave_table
Definition: af_vibrato.c:37
void * av_calloc(size_t nmemb, size_t size)
Allocate a block of nmemb * size bytes with alignment suitable for all memory accesses (including vec...
Definition: mem.c:260
AVFILTER_DEFINE_CLASS(vibrato)
static double c[64]
#define OFFSET(x)
Definition: af_vibrato.c:42
static const AVFilterPad avfilter_af_vibrato_outputs[]
Definition: af_vibrato.c:193
A list of supported formats for one end of a filter link.
Definition: formats.h:64
An instance of a filter.
Definition: avfilter.h:305
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
FILE * out
Definition: movenc.c:54
int integer
#define av_freep(p)
#define av_malloc_array(a, b)
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
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:231
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:241
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:580