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avf_avectorscope.c
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1 /*
2  * Copyright (c) 2013 Paul B Mahol
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 /**
22  * @file
23  * audio to video multimedia vectorscope filter
24  */
25 
26 #include "libavutil/avassert.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/parseutils.h"
30 #include "avfilter.h"
31 #include "formats.h"
32 #include "audio.h"
33 #include "video.h"
34 #include "internal.h"
35 
40 };
41 
42 typedef struct AudioVectorScopeContext {
43  const AVClass *class;
45  int w, h;
46  int hw, hh;
48  int contrast[3];
49  int fade[3];
50  double zoom;
53 
54 #define OFFSET(x) offsetof(AudioVectorScopeContext, x)
55 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
56 
57 static const AVOption avectorscope_options[] = {
58  { "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=LISSAJOUS}, 0, MODE_NB-1, FLAGS, "mode" },
59  { "m", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=LISSAJOUS}, 0, MODE_NB-1, FLAGS, "mode" },
60  { "lissajous", "", 0, AV_OPT_TYPE_CONST, {.i64=LISSAJOUS}, 0, 0, FLAGS, "mode" },
61  { "lissajous_xy", "", 0, AV_OPT_TYPE_CONST, {.i64=LISSAJOUS_XY}, 0, 0, FLAGS, "mode" },
62  { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS },
63  { "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS },
64  { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },
65  { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },
66  { "rc", "set red contrast", OFFSET(contrast[0]), AV_OPT_TYPE_INT, {.i64=40}, 0, 255, FLAGS },
67  { "gc", "set green contrast", OFFSET(contrast[1]), AV_OPT_TYPE_INT, {.i64=160}, 0, 255, FLAGS },
68  { "bc", "set blue contrast", OFFSET(contrast[2]), AV_OPT_TYPE_INT, {.i64=80}, 0, 255, FLAGS },
69  { "rf", "set red fade", OFFSET(fade[0]), AV_OPT_TYPE_INT, {.i64=15}, 0, 255, FLAGS },
70  { "gf", "set green fade", OFFSET(fade[1]), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, FLAGS },
71  { "bf", "set blue fade", OFFSET(fade[2]), AV_OPT_TYPE_INT, {.i64=5}, 0, 255, FLAGS },
72  { "zoom", "set zoom factor", OFFSET(zoom), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 10, FLAGS },
73  { NULL }
74 };
75 
76 AVFILTER_DEFINE_CLASS(avectorscope);
77 
78 static void draw_dot(AudioVectorScopeContext *p, unsigned x, unsigned y)
79 {
80  const int linesize = p->outpicref->linesize[0];
81  uint8_t *dst;
82 
83  if (p->zoom > 1) {
84  if (y >= p->h || x >= p->w)
85  return;
86  } else {
87  y = FFMIN(y, p->h - 1);
88  x = FFMIN(x, p->w - 1);
89  }
90 
91  dst = &p->outpicref->data[0][y * linesize + x * 4];
92  dst[0] = FFMIN(dst[0] + p->contrast[0], 255);
93  dst[1] = FFMIN(dst[1] + p->contrast[1], 255);
94  dst[2] = FFMIN(dst[2] + p->contrast[2], 255);
95 }
96 
98 {
99  const int linesize = p->outpicref->linesize[0];
100  int i, j;
101 
102  if (p->fade[0] || p->fade[1] || p->fade[2]) {
103  uint8_t *d = p->outpicref->data[0];
104  for (i = 0; i < p->h; i++) {
105  for (j = 0; j < p->w*4; j+=4) {
106  d[j+0] = FFMAX(d[j+0] - p->fade[0], 0);
107  d[j+1] = FFMAX(d[j+1] - p->fade[1], 0);
108  d[j+2] = FFMAX(d[j+2] - p->fade[2], 0);
109  }
110  d += linesize;
111  }
112  }
113 }
114 
116 {
117  AVFilterFormats *formats = NULL;
119  AVFilterLink *inlink = ctx->inputs[0];
120  AVFilterLink *outlink = ctx->outputs[0];
122  static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
123 
124  formats = ff_make_format_list(sample_fmts);
125  if (!formats)
126  return AVERROR(ENOMEM);
127  ff_formats_ref(formats, &inlink->out_formats);
128 
131 
132  formats = ff_all_samplerates();
133  if (!formats)
134  return AVERROR(ENOMEM);
135  ff_formats_ref(formats, &inlink->out_samplerates);
136 
137  formats = ff_make_format_list(pix_fmts);
138  if (!formats)
139  return AVERROR(ENOMEM);
140  ff_formats_ref(formats, &outlink->in_formats);
141 
142  return 0;
143 }
144 
145 static int config_input(AVFilterLink *inlink)
146 {
147  AVFilterContext *ctx = inlink->dst;
148  AudioVectorScopeContext *p = ctx->priv;
149  int nb_samples;
150 
151  nb_samples = FFMAX(1024, ((double)inlink->sample_rate / av_q2d(p->frame_rate)) + 0.5);
152  inlink->partial_buf_size =
153  inlink->min_samples =
154  inlink->max_samples = nb_samples;
155 
156  return 0;
157 }
158 
159 static int config_output(AVFilterLink *outlink)
160 {
161  AudioVectorScopeContext *p = outlink->src->priv;
162 
163  outlink->w = p->w;
164  outlink->h = p->h;
165  outlink->sample_aspect_ratio = (AVRational){1,1};
166  outlink->frame_rate = p->frame_rate;
167 
168  p->hw = p->w / 2;
169  p->hh = p->h / 2;
170 
171  return 0;
172 }
173 
174 static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
175 {
176  AVFilterContext *ctx = inlink->dst;
177  AVFilterLink *outlink = ctx->outputs[0];
178  AudioVectorScopeContext *p = ctx->priv;
179  const int hw = p->hw;
180  const int hh = p->hh;
181  unsigned x, y;
182  const double zoom = p->zoom;
183  int i;
184 
185  if (!p->outpicref || p->outpicref->width != outlink->w ||
186  p->outpicref->height != outlink->h) {
188  p->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
189  if (!p->outpicref) {
190  av_frame_free(&insamples);
191  return AVERROR(ENOMEM);
192  }
193 
194  for (i = 0; i < outlink->h; i++)
195  memset(p->outpicref->data[0] + i * p->outpicref->linesize[0], 0, outlink->w * 4);
196  }
197  p->outpicref->pts = insamples->pts;
198 
199  fade(p);
200 
201  switch (insamples->format) {
202  case AV_SAMPLE_FMT_S16:
203  for (i = 0; i < insamples->nb_samples; i++) {
204  int16_t *src = (int16_t *)insamples->data[0] + i * 2;
205 
206  if (p->mode == LISSAJOUS) {
207  x = ((src[1] - src[0]) * zoom / (float)(UINT16_MAX) + 1) * hw;
208  y = (1.0 - (src[0] + src[1]) * zoom / (float)UINT16_MAX) * hh;
209  } else {
210  x = (src[1] * zoom / (float)INT16_MAX + 1) * hw;
211  y = (src[0] * zoom / (float)INT16_MAX + 1) * hh;
212  }
213 
214  draw_dot(p, x, y);
215  }
216  break;
217  case AV_SAMPLE_FMT_FLT:
218  for (i = 0; i < insamples->nb_samples; i++) {
219  float *src = (float *)insamples->data[0] + i * 2;
220 
221  if (p->mode == LISSAJOUS) {
222  x = ((src[1] - src[0]) * zoom / 2 + 1) * hw;
223  y = (1.0 - (src[0] + src[1]) * zoom / 2) * hh;
224  } else {
225  x = (src[1] * zoom + 1) * hw;
226  y = (src[0] * zoom + 1) * hh;
227  }
228 
229  draw_dot(p, x, y);
230  }
231  break;
232  }
233 
234  av_frame_free(&insamples);
235 
236  return ff_filter_frame(outlink, av_frame_clone(p->outpicref));
237 }
238 
239 static av_cold void uninit(AVFilterContext *ctx)
240 {
241  AudioVectorScopeContext *p = ctx->priv;
242 
244 }
245 
247  {
248  .name = "default",
249  .type = AVMEDIA_TYPE_AUDIO,
250  .config_props = config_input,
251  .filter_frame = filter_frame,
252  },
253  { NULL }
254 };
255 
257  {
258  .name = "default",
259  .type = AVMEDIA_TYPE_VIDEO,
260  .config_props = config_output,
261  },
262  { NULL }
263 };
264 
266  .name = "avectorscope",
267  .description = NULL_IF_CONFIG_SMALL("Convert input audio to vectorscope video output."),
268  .uninit = uninit,
269  .query_formats = query_formats,
270  .priv_size = sizeof(AudioVectorScopeContext),
271  .inputs = audiovectorscope_inputs,
272  .outputs = audiovectorscope_outputs,
273  .priv_class = &avectorscope_class,
274 };