2 * Copyright (c) 2015 Paul B Mahol
4 * This file is part of FFmpeg.
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.
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.
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
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"
34 static const char *const var_names[] = { "VOLUME", "CHANNEL", "PEAK", NULL };
35 enum { VAR_VOLUME, VAR_CHANNEL, VAR_PEAK, VAR_VARS_NB };
37 typedef struct ShowVolumeContext {
42 AVRational frame_rate;
55 #define OFFSET(x) offsetof(ShowVolumeContext, x)
56 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
58 static 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 },
75 AVFILTER_DEFINE_CLASS(showvolume);
77 static av_cold int init(AVFilterContext *ctx)
79 ShowVolumeContext *s = ctx->priv;
83 ret = av_expr_parse(&s->c_expr, s->color, var_names,
84 NULL, NULL, NULL, NULL, 0, ctx);
92 static int query_formats(AVFilterContext *ctx)
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 };
102 formats = ff_make_format_list(sample_fmts);
103 if ((ret = ff_formats_ref(formats, &inlink->out_formats)) < 0)
106 layouts = ff_all_channel_counts();
107 if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0)
110 formats = ff_all_samplerates();
111 if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0)
114 formats = ff_make_format_list(pix_fmts);
115 if ((ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)
121 static int config_input(AVFilterLink *inlink)
123 AVFilterContext *ctx = inlink->dst;
124 ShowVolumeContext *s = ctx->priv;
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));
133 return AVERROR(ENOMEM);
135 s->color_lut = av_calloc(s->w, sizeof(*s->color_lut) * inlink->channels);
137 return AVERROR(ENOMEM);
142 static int config_output(AVFilterLink *outlink)
144 ShowVolumeContext *s = outlink->src->priv;
145 AVFilterLink *inlink = outlink->src->inputs[0];
148 if (s->orientation) {
150 outlink->w = s->h * inlink->channels + (inlink->channels - 1) * s->b;
153 outlink->h = s->h * inlink->channels + (inlink->channels - 1) * s->b;
156 outlink->sample_aspect_ratio = (AVRational){1,1};
157 outlink->frame_rate = s->frame_rate;
159 for (ch = 0; ch < inlink->channels; ch++) {
162 for (i = 0; i < s->w; i++) {
163 float max = i / (float)(s->w - 1);
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);
175 static void drawtext(AVFrame *pic, int x, int y, const char *txt, int o)
181 font = avpriv_cga_font, font_height = 8;
183 for (i = 0; txt[i]; i++) {
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];
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));
203 p += pic->linesize[0] - 8 * 4;
209 static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
211 AVFilterContext *ctx = inlink->dst;
212 AVFilterLink *outlink = ctx->outputs[0];
213 ShowVolumeContext *s = ctx->priv;
214 const int step = s->step;
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);
223 av_frame_free(&insamples);
224 return AVERROR(ENOMEM);
227 for (i = 0; i < outlink->h; i++)
228 memset(s->out->data[0] + i * s->out->linesize[0], 0, outlink->w * 4);
230 s->out->pts = insamples->pts;
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);
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;
248 for (i = 0; i < insamples->nb_samples; i++)
249 max = FFMAX(max, src[i]);
251 s->values[c * VAR_VARS_NB + VAR_VOLUME] = 20.0 * log10(max);
252 max = av_clipf(max, 0, 1);
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]);
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));
267 drawtext(s->out, c * (s->h + s->b) + (s->h - 10) / 2, outlink->h - 35, channel_name, 1);
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;
276 for (i = 0; i < insamples->nb_samples; i++)
277 max = FFMAX(max, src[i]);
279 s->values[c * VAR_VARS_NB + VAR_VOLUME] = 20.0 * log10(max);
280 max = av_clipf(max, 0, 1);
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];
285 for (k = 0; k < s->w * max; k++) {
286 AV_WN32A(dst + k * 4, lut[k]);
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));
296 drawtext(s->out, 2, c * (s->h + s->b) + (s->h - 8) / 2, channel_name, 0);
301 av_frame_free(&insamples);
302 out = av_frame_clone(s->out);
304 return AVERROR(ENOMEM);
305 av_frame_make_writable(out);
307 for (c = 0; c < inlink->channels && s->draw_volume; c++) {
309 if (s->orientation) {
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);
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);
322 return ff_filter_frame(outlink, out);
325 static av_cold void uninit(AVFilterContext *ctx)
327 ShowVolumeContext *s = ctx->priv;
329 av_frame_free(&s->out);
330 av_expr_free(s->c_expr);
331 av_freep(&s->values);
332 av_freep(&s->color_lut);
335 static const AVFilterPad showvolume_inputs[] = {
338 .type = AVMEDIA_TYPE_AUDIO,
339 .config_props = config_input,
340 .filter_frame = filter_frame,
345 static const AVFilterPad showvolume_outputs[] = {
348 .type = AVMEDIA_TYPE_VIDEO,
349 .config_props = config_output,
354 AVFilter ff_avf_showvolume = {
355 .name = "showvolume",
356 .description = NULL_IF_CONFIG_SMALL("Convert input audio volume to video output."),
359 .query_formats = query_formats,
360 .priv_size = sizeof(ShowVolumeContext),
361 .inputs = showvolume_inputs,
362 .outputs = showvolume_outputs,
363 .priv_class = &showvolume_class,