FFmpeg
af_acontrast.c
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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 
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);
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 
46 {
49  static const enum AVSampleFormat sample_fmts[] = {
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 
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 
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 
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 };
float, planar
Definition: samplefmt.h:69
static const AVOption acontrast_options[]
Definition: af_acontrast.c:38
#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:295
AVOption.
Definition: opt.h:246
Main libavfilter public API header.
channels
Definition: aptx.c:30
double, planar
Definition: samplefmt.h:70
#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
AVOptions.
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
#define OFFSET(x)
Definition: af_acontrast.c:35
static void filter_flt(void **d, const void **s, int nb_samples, int channels, float contrast)
Definition: af_acontrast.c:75
A filter pad used for either input or output.
Definition: internal.h:54
AVFILTER_DEFINE_CLASS(acontrast)
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
static int query_formats(AVFilterContext *ctx)
Definition: af_acontrast.c:45
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
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
int channels
number of audio channels, only used for audio.
Definition: frame.h:601
audio channel layout utility functions
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
#define M_PI_2
Definition: mathematics.h:55
AVFormatContext * ctx
Definition: movenc.c:48
static void filter_dbl(void **d, const void **s, int nb_samples, int channels, float contrast)
Definition: af_acontrast.c:95
static void filter_fltp(void **d, const void **s, int nb_samples, int channels, float contrast)
Definition: af_acontrast.c:115
#define s(width, name)
Definition: cbs_vp9.c:257
int n
Definition: avisynth_c.h:760
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
A list of supported channel layouts.
Definition: formats.h:85
AVFilter ff_af_acontrast
Definition: af_acontrast.c:211
#define sinf(x)
Definition: libm.h:419
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_acontrast.c:166
static int config_input(AVFilterLink *inlink)
Definition: af_acontrast.c:151
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)\n", 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
static void filter_dblp(void **d, const void **s, int nb_samples, int channels, float contrast)
Definition: af_acontrast.c:133
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
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
#define A
Definition: af_acontrast.c:36
void(* filter)(void **dst, const void **src, int nb_samples, int channels, float contrast)
Definition: af_acontrast.c:31
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
formats
Definition: signature.h:48
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
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:342
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:361
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