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af_stereowiden.c
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1 /*
2  * Copyright (C) 2012 VLC authors and VideoLAN
3  * Author : Sukrit Sangwan < sukritsangwan at gmail dot com >
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 StereoWidenContext {
29  const AVClass *class;
30 
31  float delay;
32  float feedback;
33  float crossfeed;
34  float drymix;
35 
36  float *buffer;
37  float *write;
38  int length;
40 
41 #define OFFSET(x) offsetof(StereoWidenContext, x)
42 #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
43 
44 static const AVOption stereowiden_options[] = {
45  { "delay", "set delay time", OFFSET(delay), AV_OPT_TYPE_FLOAT, {.dbl=20}, 1, 100, A },
46  { "feedback", "set feedback gain", OFFSET(feedback), AV_OPT_TYPE_FLOAT, {.dbl=.3}, 0, 0.9, A },
47  { "crossfeed", "set cross feed", OFFSET(crossfeed), AV_OPT_TYPE_FLOAT, {.dbl=.3}, 0, 0.8, A },
48  { "drymix", "set dry-mix", OFFSET(drymix), AV_OPT_TYPE_FLOAT, {.dbl=.8}, 0, 1.0, A },
49  { NULL }
50 };
51 
52 AVFILTER_DEFINE_CLASS(stereowiden);
53 
55 {
58  int ret;
59 
60  if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_FLT )) < 0 ||
61  (ret = ff_set_common_formats (ctx , formats )) < 0 ||
62  (ret = ff_add_channel_layout (&layout , AV_CH_LAYOUT_STEREO)) < 0 ||
63  (ret = ff_set_common_channel_layouts (ctx , layout )) < 0)
64  return ret;
65 
66  formats = ff_all_samplerates();
67  return ff_set_common_samplerates(ctx, formats);
68 }
69 
70 static int config_input(AVFilterLink *inlink)
71 {
72  AVFilterContext *ctx = inlink->dst;
73  StereoWidenContext *s = ctx->priv;
74 
75  s->length = 2 * s->delay * inlink->sample_rate / 1000;
76  s->buffer = av_calloc(s->length, sizeof(*s->buffer));
77  if (!s->buffer)
78  return AVERROR(ENOMEM);
79  s->write = s->buffer;
80 
81  return 0;
82 }
83 
84 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
85 {
86  AVFilterContext *ctx = inlink->dst;
87  AVFilterLink *outlink = ctx->outputs[0];
88  StereoWidenContext *s = ctx->priv;
89  const float *src = (const float *)in->data[0];
90  const float drymix = s->drymix;
91  const float crossfeed = s->crossfeed;
92  const float feedback = s->feedback;
93  AVFrame *out;
94  float *dst;
95  int n;
96 
97  if (av_frame_is_writable(in)) {
98  out = in;
99  } else {
100  out = ff_get_audio_buffer(inlink, in->nb_samples);
101  if (!out) {
102  av_frame_free(&in);
103  return AVERROR(ENOMEM);
104  }
106  }
107  dst = (float *)out->data[0];
108 
109  for (n = 0; n < in->nb_samples; n++, src += 2, dst += 2) {
110  const float left = src[0], right = src[1];
111  float *read = s->write + 2;
112 
113  if (read > s->buffer + s->length)
114  read = s->buffer;
115 
116  dst[0] = drymix * left - crossfeed * right - feedback * read[1];
117  dst[1] = drymix * right - crossfeed * left - feedback * read[0];
118 
119  s->write[0] = left;
120  s->write[1] = right;
121 
122  if (s->write == s->buffer + s->length)
123  s->write = s->buffer;
124  else
125  s->write += 2;
126  }
127 
128  if (out != in)
129  av_frame_free(&in);
130  return ff_filter_frame(outlink, out);
131 }
132 
134 {
135  StereoWidenContext *s = ctx->priv;
136 
137  av_freep(&s->buffer);
138 }
139 
140 static const AVFilterPad inputs[] = {
141  {
142  .name = "default",
143  .type = AVMEDIA_TYPE_AUDIO,
144  .filter_frame = filter_frame,
145  .config_props = config_input,
146  },
147  { NULL }
148 };
149 
150 static const AVFilterPad outputs[] = {
151  {
152  .name = "default",
153  .type = AVMEDIA_TYPE_AUDIO,
154  },
155  { NULL }
156 };
157 
159  .name = "stereowiden",
160  .description = NULL_IF_CONFIG_SMALL("Apply stereo widening effect."),
161  .query_formats = query_formats,
162  .priv_size = sizeof(StereoWidenContext),
163  .priv_class = &stereowiden_class,
164  .uninit = uninit,
165  .inputs = inputs,
166  .outputs = outputs,
167 };
#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
Main libavfilter public API header.
static enum AVSampleFormat formats[]
Definition: avresample.c:163
#define AV_CH_LAYOUT_STEREO
static av_cold void uninit(AVFilterContext *ctx)
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.
A filter pad used for either input or output.
Definition: internal.h:53
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
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
Definition: formats.c:343
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 ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:337
static const AVOption stereowiden_options[]
audio channel layout utility functions
static const AVFilterPad outputs[]
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
AVFormatContext * ctx
Definition: movenc.c:48
int n
Definition: avisynth_c.h:547
#define src
Definition: vp9dsp.c:530
#define A
static const AVFilterPad inputs[]
A list of supported channel layouts.
Definition: formats.h:85
AVFILTER_DEFINE_CLASS(stereowiden)
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
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
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:395
#define OFFSET(x)
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
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
if(ret< 0)
Definition: vf_mcdeint.c:282
static int config_input(AVFilterLink *inlink)
A list of supported formats for one end of a filter link.
Definition: formats.h:64
uint64_t layout
An instance of a filter.
Definition: avfilter.h:305
FILE * out
Definition: movenc.c:54
AVFilter ff_af_stereowiden
#define av_freep(p)
static int query_formats(AVFilterContext *ctx)
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:241
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:580