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path: root/libavfilter/avf_showvolume.c (plain)
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1/*
2 * Copyright (c) 2015 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#include "libavutil/avstring.h"
22#include "libavutil/channel_layout.h"
23#include "libavutil/eval.h"
24#include "libavutil/intreadwrite.h"
25#include "libavutil/opt.h"
26#include "libavutil/parseutils.h"
27#include "libavutil/xga_font_data.h"
28#include "avfilter.h"
29#include "formats.h"
30#include "audio.h"
31#include "video.h"
32#include "internal.h"
33
34static const char *const var_names[] = { "VOLUME", "CHANNEL", "PEAK", NULL };
35enum { VAR_VOLUME, VAR_CHANNEL, VAR_PEAK, VAR_VARS_NB };
36
37typedef struct ShowVolumeContext {
38 const AVClass *class;
39 int w, h;
40 int b;
41 double f;
42 AVRational frame_rate;
43 char *color;
44 int orientation;
45 int step;
46
47 AVFrame *out;
48 AVExpr *c_expr;
49 int draw_text;
50 int draw_volume;
51 double *values;
52 uint32_t *color_lut;
53} ShowVolumeContext;
54
55#define OFFSET(x) offsetof(ShowVolumeContext, x)
56#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
57
58static const AVOption showvolume_options[] = {
59 { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
60 { "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
61 { "b", "set border width", OFFSET(b), AV_OPT_TYPE_INT, {.i64=1}, 0, 5, FLAGS },
62 { "w", "set channel width", OFFSET(w), AV_OPT_TYPE_INT, {.i64=400}, 80, 8192, FLAGS },
63 { "h", "set channel height", OFFSET(h), AV_OPT_TYPE_INT, {.i64=20}, 1, 900, FLAGS },
64 { "f", "set fade", OFFSET(f), AV_OPT_TYPE_DOUBLE, {.dbl=0.95}, 0.001, 1, FLAGS },
65 { "c", "set volume color expression", OFFSET(color), AV_OPT_TYPE_STRING, {.str="PEAK*255+floor((1-PEAK)*255)*256+0xff000000"}, 0, 0, FLAGS },
66 { "t", "display channel names", OFFSET(draw_text), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
67 { "v", "display volume value", OFFSET(draw_volume), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
68 { "o", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "orientation" },
69 { "h", "horizontal", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "orientation" },
70 { "v", "vertical", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "orientation" },
71 { "s", "set step size", OFFSET(step), AV_OPT_TYPE_INT, {.i64=0}, 0, 5, FLAGS },
72 { NULL }
73};
74
75AVFILTER_DEFINE_CLASS(showvolume);
76
77static av_cold int init(AVFilterContext *ctx)
78{
79 ShowVolumeContext *s = ctx->priv;
80 int ret;
81
82 if (s->color) {
83 ret = av_expr_parse(&s->c_expr, s->color, var_names,
84 NULL, NULL, NULL, NULL, 0, ctx);
85 if (ret < 0)
86 return ret;
87 }
88
89 return 0;
90}
91
92static int query_formats(AVFilterContext *ctx)
93{
94 AVFilterFormats *formats = NULL;
95 AVFilterChannelLayouts *layouts = NULL;
96 AVFilterLink *inlink = ctx->inputs[0];
97 AVFilterLink *outlink = ctx->outputs[0];
98 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };
99 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
100 int ret;
101
102 formats = ff_make_format_list(sample_fmts);
103 if ((ret = ff_formats_ref(formats, &inlink->out_formats)) < 0)
104 return ret;
105
106 layouts = ff_all_channel_counts();
107 if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0)
108 return ret;
109
110 formats = ff_all_samplerates();
111 if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0)
112 return ret;
113
114 formats = ff_make_format_list(pix_fmts);
115 if ((ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)
116 return ret;
117
118 return 0;
119}
120
121static int config_input(AVFilterLink *inlink)
122{
123 AVFilterContext *ctx = inlink->dst;
124 ShowVolumeContext *s = ctx->priv;
125 int nb_samples;
126
127 nb_samples = FFMAX(1024, ((double)inlink->sample_rate / av_q2d(s->frame_rate)) + 0.5);
128 inlink->partial_buf_size =
129 inlink->min_samples =
130 inlink->max_samples = nb_samples;
131 s->values = av_calloc(inlink->channels * VAR_VARS_NB, sizeof(double));
132 if (!s->values)
133 return AVERROR(ENOMEM);
134
135 s->color_lut = av_calloc(s->w, sizeof(*s->color_lut) * inlink->channels);
136 if (!s->color_lut)
137 return AVERROR(ENOMEM);
138
139 return 0;
140}
141
142static int config_output(AVFilterLink *outlink)
143{
144 ShowVolumeContext *s = outlink->src->priv;
145 AVFilterLink *inlink = outlink->src->inputs[0];
146 int ch;
147
148 if (s->orientation) {
149 outlink->h = s->w;
150 outlink->w = s->h * inlink->channels + (inlink->channels - 1) * s->b;
151 } else {
152 outlink->w = s->w;
153 outlink->h = s->h * inlink->channels + (inlink->channels - 1) * s->b;
154 }
155
156 outlink->sample_aspect_ratio = (AVRational){1,1};
157 outlink->frame_rate = s->frame_rate;
158
159 for (ch = 0; ch < inlink->channels; ch++) {
160 int i;
161
162 for (i = 0; i < s->w; i++) {
163 float max = i / (float)(s->w - 1);
164
165 s->values[ch * VAR_VARS_NB + VAR_PEAK] = max;
166 s->values[ch * VAR_VARS_NB + VAR_VOLUME] = 20.0 * log10(max);
167 s->values[ch * VAR_VARS_NB + VAR_CHANNEL] = ch;
168 s->color_lut[ch * s->w + i] = av_expr_eval(s->c_expr, &s->values[ch * VAR_VARS_NB], NULL);
169 }
170 }
171
172 return 0;
173}
174
175static void drawtext(AVFrame *pic, int x, int y, const char *txt, int o)
176{
177 const uint8_t *font;
178 int font_height;
179 int i;
180
181 font = avpriv_cga_font, font_height = 8;
182
183 for (i = 0; txt[i]; i++) {
184 int char_y, mask;
185
186 if (o) {
187 for (char_y = font_height - 1; char_y >= 0; char_y--) {
188 uint8_t *p = pic->data[0] + (y + i * 10) * pic->linesize[0] + x * 4;
189 for (mask = 0x80; mask; mask >>= 1) {
190 if (font[txt[i] * font_height + font_height - 1 - char_y] & mask)
191 AV_WN32(&p[char_y * 4], ~AV_RN32(&p[char_y * 4]));
192 p += pic->linesize[0];
193 }
194 }
195 } else {
196 uint8_t *p = pic->data[0] + y * pic->linesize[0] + (x + i * 8) * 4;
197 for (char_y = 0; char_y < font_height; char_y++) {
198 for (mask = 0x80; mask; mask >>= 1) {
199 if (font[txt[i] * font_height + char_y] & mask)
200 AV_WN32(p, ~AV_RN32(p));
201 p += 4;
202 }
203 p += pic->linesize[0] - 8 * 4;
204 }
205 }
206 }
207}
208
209static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
210{
211 AVFilterContext *ctx = inlink->dst;
212 AVFilterLink *outlink = ctx->outputs[0];
213 ShowVolumeContext *s = ctx->priv;
214 const int step = s->step;
215 int c, i, j, k;
216 AVFrame *out;
217
218 if (!s->out || s->out->width != outlink->w ||
219 s->out->height != outlink->h) {
220 av_frame_free(&s->out);
221 s->out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
222 if (!s->out) {
223 av_frame_free(&insamples);
224 return AVERROR(ENOMEM);
225 }
226
227 for (i = 0; i < outlink->h; i++)
228 memset(s->out->data[0] + i * s->out->linesize[0], 0, outlink->w * 4);
229 }
230 s->out->pts = insamples->pts;
231
232 for (j = 0; j < outlink->h; j++) {
233 uint8_t *dst = s->out->data[0] + j * s->out->linesize[0];
234 for (k = 0; k < outlink->w; k++) {
235 dst[k * 4 + 0] = FFMAX(dst[k * 4 + 0] * s->f, 0);
236 dst[k * 4 + 1] = FFMAX(dst[k * 4 + 1] * s->f, 0);
237 dst[k * 4 + 2] = FFMAX(dst[k * 4 + 2] * s->f, 0);
238 dst[k * 4 + 3] = FFMAX(dst[k * 4 + 3] * s->f, 0);
239 }
240 }
241
242 if (s->orientation) {
243 for (c = 0; c < inlink->channels; c++) {
244 float *src = (float *)insamples->extended_data[c];
245 uint32_t *lut = s->color_lut + s->w * c;
246 float max = 0;
247
248 for (i = 0; i < insamples->nb_samples; i++)
249 max = FFMAX(max, src[i]);
250
251 s->values[c * VAR_VARS_NB + VAR_VOLUME] = 20.0 * log10(max);
252 max = av_clipf(max, 0, 1);
253
254 for (j = outlink->h - outlink->h * max; j < s->w; j++) {
255 uint8_t *dst = s->out->data[0] + j * s->out->linesize[0] + c * (s->b + s->h) * 4;
256 for (k = 0; k < s->h; k++) {
257 AV_WN32A(&dst[k * 4], lut[s->w - j - 1]);
258 if (j & step)
259 j += step;
260 }
261 }
262
263 if (s->h >= 8 && s->draw_text) {
264 const char *channel_name = av_get_channel_name(av_channel_layout_extract_channel(insamples->channel_layout, c));
265 if (!channel_name)
266 continue;
267 drawtext(s->out, c * (s->h + s->b) + (s->h - 10) / 2, outlink->h - 35, channel_name, 1);
268 }
269 }
270 } else {
271 for (c = 0; c < inlink->channels; c++) {
272 float *src = (float *)insamples->extended_data[c];
273 uint32_t *lut = s->color_lut + s->w * c;
274 float max = 0;
275
276 for (i = 0; i < insamples->nb_samples; i++)
277 max = FFMAX(max, src[i]);
278
279 s->values[c * VAR_VARS_NB + VAR_VOLUME] = 20.0 * log10(max);
280 max = av_clipf(max, 0, 1);
281
282 for (j = 0; j < s->h; j++) {
283 uint8_t *dst = s->out->data[0] + (c * s->h + c * s->b + j) * s->out->linesize[0];
284
285 for (k = 0; k < s->w * max; k++) {
286 AV_WN32A(dst + k * 4, lut[k]);
287 if (k & step)
288 k += step;
289 }
290 }
291
292 if (s->h >= 8 && s->draw_text) {
293 const char *channel_name = av_get_channel_name(av_channel_layout_extract_channel(insamples->channel_layout, c));
294 if (!channel_name)
295 continue;
296 drawtext(s->out, 2, c * (s->h + s->b) + (s->h - 8) / 2, channel_name, 0);
297 }
298 }
299 }
300
301 av_frame_free(&insamples);
302 out = av_frame_clone(s->out);
303 if (!out)
304 return AVERROR(ENOMEM);
305 av_frame_make_writable(out);
306
307 for (c = 0; c < inlink->channels && s->draw_volume; c++) {
308 char buf[16];
309 if (s->orientation) {
310 if (s->h >= 8) {
311 snprintf(buf, sizeof(buf), "%.2f", s->values[c * VAR_VARS_NB + VAR_VOLUME]);
312 drawtext(out, c * (s->h + s->b) + (s->h - 8) / 2, 2, buf, 1);
313 }
314 } else {
315 if (s->h >= 8) {
316 snprintf(buf, sizeof(buf), "%.2f", s->values[c * VAR_VARS_NB + VAR_VOLUME]);
317 drawtext(out, FFMAX(0, s->w - 8 * (int)strlen(buf)), c * (s->h + s->b) + (s->h - 8) / 2, buf, 0);
318 }
319 }
320 }
321
322 return ff_filter_frame(outlink, out);
323}
324
325static av_cold void uninit(AVFilterContext *ctx)
326{
327 ShowVolumeContext *s = ctx->priv;
328
329 av_frame_free(&s->out);
330 av_expr_free(s->c_expr);
331 av_freep(&s->values);
332 av_freep(&s->color_lut);
333}
334
335static const AVFilterPad showvolume_inputs[] = {
336 {
337 .name = "default",
338 .type = AVMEDIA_TYPE_AUDIO,
339 .config_props = config_input,
340 .filter_frame = filter_frame,
341 },
342 { NULL }
343};
344
345static const AVFilterPad showvolume_outputs[] = {
346 {
347 .name = "default",
348 .type = AVMEDIA_TYPE_VIDEO,
349 .config_props = config_output,
350 },
351 { NULL }
352};
353
354AVFilter ff_avf_showvolume = {
355 .name = "showvolume",
356 .description = NULL_IF_CONFIG_SMALL("Convert input audio volume to video output."),
357 .init = init,
358 .uninit = uninit,
359 .query_formats = query_formats,
360 .priv_size = sizeof(ShowVolumeContext),
361 .inputs = showvolume_inputs,
362 .outputs = showvolume_outputs,
363 .priv_class = &showvolume_class,
364};
365
generated by cgit at 2024-05-17 03:40:14 (GMT)