2 * Copyright (c) 2012 Clément Bœsch
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (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
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 * EBU R.128 implementation
24 * @see http://tech.ebu.ch/loudness
25 * @see https://www.youtube.com/watch?v=iuEtQqC-Sqo "EBU R128 Introduction - Florian Camerer"
27 * @todo implement start/stop/reset through filter command injection
28 * @todo support other frequencies to avoid resampling
33 #include "libavutil/avassert.h"
34 #include "libavutil/avstring.h"
35 #include "libavutil/channel_layout.h"
36 #include "libavutil/dict.h"
37 #include "libavutil/xga_font_data.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/timestamp.h"
45 #define MAX_CHANNELS 63
47 /* pre-filter coefficients */
48 #define PRE_B0 1.53512485958697
49 #define PRE_B1 -2.69169618940638
50 #define PRE_B2 1.19839281085285
51 #define PRE_A1 -1.69065929318241
52 #define PRE_A2 0.73248077421585
54 /* RLB-filter coefficients */
58 #define RLB_A1 -1.99004745483398
59 #define RLB_A2 0.99007225036621
61 #define ABS_THRES -70 ///< silence gate: we discard anything below this absolute (LUFS) threshold
62 #define ABS_UP_THRES 10 ///< upper loud limit to consider (ABS_THRES being the minimum)
63 #define HIST_GRAIN 100 ///< defines histogram precision
64 #define HIST_SIZE ((ABS_UP_THRES - ABS_THRES) * HIST_GRAIN + 1)
67 * An histogram is an array of HIST_SIZE hist_entry storing all the energies
68 * recorded (with an accuracy of 1/HIST_GRAIN) of the loudnesses from ABS_THRES
69 * (at 0) to ABS_UP_THRES (at HIST_SIZE-1).
70 * This fixed-size system avoids the need of a list of energies growing
71 * infinitely over the time and is thus more scalable.
74 int count; ///< how many times the corresponding value occurred
75 double energy; ///< E = 10^((L + 0.691) / 10)
76 double loudness; ///< L = -0.691 + 10 * log10(E)
80 double *cache[MAX_CHANNELS]; ///< window of filtered samples (N ms)
81 int cache_pos; ///< focus on the last added bin in the cache array
82 double sum[MAX_CHANNELS]; ///< sum of the last N ms filtered samples (cache content)
83 int filled; ///< 1 if the cache is completely filled, 0 otherwise
84 double rel_threshold; ///< relative threshold
85 double sum_kept_powers; ///< sum of the powers (weighted sums) above absolute threshold
86 int nb_kept_powers; ///< number of sum above absolute threshold
87 struct hist_entry *histogram; ///< histogram of the powers, used to compute LRA and I
90 struct rect { int x, y, w, h; };
93 const AVClass *class; ///< AVClass context for log and options purpose
96 int do_video; ///< 1 if video output enabled, 0 otherwise
97 int w, h; ///< size of the video output
98 struct rect text; ///< rectangle for the LU legend on the left
99 struct rect graph; ///< rectangle for the main graph in the center
100 struct rect gauge; ///< rectangle for the gauge on the right
101 AVFrame *outpicref; ///< output picture reference, updated regularly
102 int meter; ///< select a EBU mode between +9 and +18
103 int scale_range; ///< the range of LU values according to the meter
104 int y_zero_lu; ///< the y value (pixel position) for 0 LU
105 int *y_line_ref; ///< y reference values for drawing the LU lines in the graph and the gauge
108 int nb_channels; ///< number of channels in the input
109 double *ch_weighting; ///< channel weighting mapping
110 int sample_count; ///< sample count used for refresh frequency, reset at refresh
113 * The mult by 3 in the following is for X[i], X[i-1] and X[i-2] */
114 double x[MAX_CHANNELS * 3]; ///< 3 input samples cache for each channel
115 double y[MAX_CHANNELS * 3]; ///< 3 pre-filter samples cache for each channel
116 double z[MAX_CHANNELS * 3]; ///< 3 RLB-filter samples cache for each channel
118 #define I400_BINS (48000 * 4 / 10)
119 #define I3000_BINS (48000 * 3)
120 struct integrator i400; ///< 400ms integrator, used for Momentary loudness (M), and Integrated loudness (I)
121 struct integrator i3000; ///< 3s integrator, used for Short term loudness (S), and Loudness Range (LRA)
123 /* I and LRA specific */
124 double integrated_loudness; ///< integrated loudness in LUFS (I)
125 double loudness_range; ///< loudness range in LU (LRA)
126 double lra_low, lra_high; ///< low and high LRA values
129 int loglevel; ///< log level for frame logging
130 int metadata; ///< whether or not to inject loudness results in frames
133 #define OFFSET(x) offsetof(EBUR128Context, x)
134 #define A AV_OPT_FLAG_AUDIO_PARAM
135 #define V AV_OPT_FLAG_VIDEO_PARAM
136 #define F AV_OPT_FLAG_FILTERING_PARAM
137 static const AVOption ebur128_options[] = {
138 { "video", "set video output", OFFSET(do_video), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, V|F },
139 { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x480"}, 0, 0, V|F },
140 { "meter", "set scale meter (+9 to +18)", OFFSET(meter), AV_OPT_TYPE_INT, {.i64 = 9}, 9, 18, V|F },
141 { "framelog", "force frame logging level", OFFSET(loglevel), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, A|V|F, "level" },
142 { "info", "information logging level", 0, AV_OPT_TYPE_CONST, {.i64 = AV_LOG_INFO}, INT_MIN, INT_MAX, A|V|F, "level" },
143 { "verbose", "verbose logging level", 0, AV_OPT_TYPE_CONST, {.i64 = AV_LOG_VERBOSE}, INT_MIN, INT_MAX, A|V|F, "level" },
144 { "metadata", "inject metadata in the filtergraph", OFFSET(metadata), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, A|V|F },
148 AVFILTER_DEFINE_CLASS(ebur128);
150 static const uint8_t graph_colors[] = {
151 0xdd, 0x66, 0x66, // value above 0LU non reached
152 0x66, 0x66, 0xdd, // value below 0LU non reached
153 0x96, 0x33, 0x33, // value above 0LU reached
154 0x33, 0x33, 0x96, // value below 0LU reached
155 0xdd, 0x96, 0x96, // value above 0LU line non reached
156 0x96, 0x96, 0xdd, // value below 0LU line non reached
157 0xdd, 0x33, 0x33, // value above 0LU line reached
158 0x33, 0x33, 0xdd, // value below 0LU line reached
161 static const uint8_t *get_graph_color(const EBUR128Context *ebur128, int v, int y)
163 const int below0 = y > ebur128->y_zero_lu;
164 const int reached = y >= v;
165 const int line = ebur128->y_line_ref[y] || y == ebur128->y_zero_lu;
166 const int colorid = 4*line + 2*reached + below0;
167 return graph_colors + 3*colorid;
170 static inline int lu_to_y(const EBUR128Context *ebur128, double v)
172 v += 2 * ebur128->meter; // make it in range [0;...]
173 v = av_clipf(v, 0, ebur128->scale_range); // make sure it's in the graph scale
174 v = ebur128->scale_range - v; // invert value (y=0 is on top)
175 return v * ebur128->graph.h / ebur128->scale_range; // rescale from scale range to px height
181 static const uint8_t font_colors[] = {
186 static void drawtext(AVFrame *pic, int x, int y, int ftid, const uint8_t *color, const char *fmt, ...)
194 if (ftid == FONT16) font = avpriv_vga16_font, font_height = 16;
195 else if (ftid == FONT8) font = avpriv_cga_font, font_height = 8;
199 vsnprintf(buf, sizeof(buf), fmt, vl);
202 for (i = 0; buf[i]; i++) {
204 uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8)*3;
206 for (char_y = 0; char_y < font_height; char_y++) {
207 for (mask = 0x80; mask; mask >>= 1) {
208 if (font[buf[i] * font_height + char_y] & mask)
211 memcpy(p, "\x00\x00\x00", 3);
214 p += pic->linesize[0] - 8*3;
219 static void drawline(AVFrame *pic, int x, int y, int len, int step)
222 uint8_t *p = pic->data[0] + y*pic->linesize[0] + x*3;
224 for (i = 0; i < len; i++) {
225 memcpy(p, "\x00\xff\x00", 3);
230 static int config_video_output(AVFilterLink *outlink)
234 AVFilterContext *ctx = outlink->src;
235 EBUR128Context *ebur128 = ctx->priv;
238 /* check if there is enough space to represent everything decently */
239 if (ebur128->w < 640 || ebur128->h < 480) {
240 av_log(ctx, AV_LOG_ERROR, "Video size %dx%d is too small, "
241 "minimum size is 640x480\n", ebur128->w, ebur128->h);
242 return AVERROR(EINVAL);
244 outlink->w = ebur128->w;
245 outlink->h = ebur128->h;
249 /* configure text area position and size */
250 ebur128->text.x = PAD;
251 ebur128->text.y = 40;
252 ebur128->text.w = 3 * 8; // 3 characters
253 ebur128->text.h = ebur128->h - PAD - ebur128->text.y;
255 /* configure gauge position and size */
256 ebur128->gauge.w = 20;
257 ebur128->gauge.h = ebur128->text.h;
258 ebur128->gauge.x = ebur128->w - PAD - ebur128->gauge.w;
259 ebur128->gauge.y = ebur128->text.y;
261 /* configure graph position and size */
262 ebur128->graph.x = ebur128->text.x + ebur128->text.w + PAD;
263 ebur128->graph.y = ebur128->gauge.y;
264 ebur128->graph.w = ebur128->gauge.x - ebur128->graph.x - PAD;
265 ebur128->graph.h = ebur128->gauge.h;
267 /* graph and gauge share the LU-to-pixel code */
268 av_assert0(ebur128->graph.h == ebur128->gauge.h);
270 /* prepare the initial picref buffer */
271 av_frame_free(&ebur128->outpicref);
272 ebur128->outpicref = outpicref =
273 ff_get_video_buffer(outlink, outlink->w, outlink->h);
275 return AVERROR(ENOMEM);
276 outlink->sample_aspect_ratio = (AVRational){1,1};
278 /* init y references values (to draw LU lines) */
279 ebur128->y_line_ref = av_calloc(ebur128->graph.h + 1, sizeof(*ebur128->y_line_ref));
280 if (!ebur128->y_line_ref)
281 return AVERROR(ENOMEM);
283 /* black background */
284 memset(outpicref->data[0], 0, ebur128->h * outpicref->linesize[0]);
286 /* draw LU legends */
287 drawtext(outpicref, PAD, PAD+16, FONT8, font_colors+3, " LU");
288 for (i = ebur128->meter; i >= -ebur128->meter * 2; i--) {
289 y = lu_to_y(ebur128, i);
290 x = PAD + (i < 10 && i > -10) * 8;
291 ebur128->y_line_ref[y] = i;
292 y -= 4; // -4 to center vertically
293 drawtext(outpicref, x, y + ebur128->graph.y, FONT8, font_colors+3,
294 "%c%d", i < 0 ? '-' : i > 0 ? '+' : ' ', FFABS(i));
298 ebur128->y_zero_lu = lu_to_y(ebur128, 0);
299 p = outpicref->data[0] + ebur128->graph.y * outpicref->linesize[0]
300 + ebur128->graph.x * 3;
301 for (y = 0; y < ebur128->graph.h; y++) {
302 const uint8_t *c = get_graph_color(ebur128, INT_MAX, y);
304 for (x = 0; x < ebur128->graph.w; x++)
305 memcpy(p + x*3, c, 3);
306 p += outpicref->linesize[0];
309 /* draw fancy rectangles around the graph and the gauge */
310 #define DRAW_RECT(r) do { \
311 drawline(outpicref, r.x, r.y - 1, r.w, 3); \
312 drawline(outpicref, r.x, r.y + r.h, r.w, 3); \
313 drawline(outpicref, r.x - 1, r.y, r.h, outpicref->linesize[0]); \
314 drawline(outpicref, r.x + r.w, r.y, r.h, outpicref->linesize[0]); \
316 DRAW_RECT(ebur128->graph);
317 DRAW_RECT(ebur128->gauge);
319 outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
324 static int config_audio_input(AVFilterLink *inlink)
326 AVFilterContext *ctx = inlink->dst;
327 EBUR128Context *ebur128 = ctx->priv;
329 /* force 100ms framing in case of metadata injection: the frames must have
330 * a granularity of the window overlap to be accurately exploited */
331 if (ebur128->metadata)
332 inlink->min_samples =
333 inlink->max_samples =
334 inlink->partial_buf_size = inlink->sample_rate / 10;
338 static int config_audio_output(AVFilterLink *outlink)
342 AVFilterContext *ctx = outlink->src;
343 EBUR128Context *ebur128 = ctx->priv;
344 const int nb_channels = av_get_channel_layout_nb_channels(outlink->channel_layout);
346 #define BACK_MASK (AV_CH_BACK_LEFT |AV_CH_BACK_CENTER |AV_CH_BACK_RIGHT| \
347 AV_CH_TOP_BACK_LEFT|AV_CH_TOP_BACK_CENTER|AV_CH_TOP_BACK_RIGHT| \
348 AV_CH_SIDE_LEFT |AV_CH_SIDE_RIGHT| \
349 AV_CH_SURROUND_DIRECT_LEFT |AV_CH_SURROUND_DIRECT_RIGHT)
351 ebur128->nb_channels = nb_channels;
352 ebur128->ch_weighting = av_calloc(nb_channels, sizeof(*ebur128->ch_weighting));
353 if (!ebur128->ch_weighting)
354 return AVERROR(ENOMEM);
356 for (i = 0; i < nb_channels; i++) {
358 /* find the next bit that is set starting from the right */
359 while ((outlink->channel_layout & 1ULL<<idx_bitposn) == 0 && idx_bitposn < 63)
362 /* channel weighting */
363 if ((1ULL<<idx_bitposn & AV_CH_LOW_FREQUENCY) ||
364 (1ULL<<idx_bitposn & AV_CH_LOW_FREQUENCY_2)) {
365 ebur128->ch_weighting[i] = 0;
366 } else if (1ULL<<idx_bitposn & BACK_MASK) {
367 ebur128->ch_weighting[i] = 1.41;
369 ebur128->ch_weighting[i] = 1.0;
374 if (!ebur128->ch_weighting[i])
377 /* bins buffer for the two integration window (400ms and 3s) */
378 ebur128->i400.cache[i] = av_calloc(I400_BINS, sizeof(*ebur128->i400.cache[0]));
379 ebur128->i3000.cache[i] = av_calloc(I3000_BINS, sizeof(*ebur128->i3000.cache[0]));
380 if (!ebur128->i400.cache[i] || !ebur128->i3000.cache[i])
381 return AVERROR(ENOMEM);
384 outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
389 #define ENERGY(loudness) (pow(10, ((loudness) + 0.691) / 10.))
390 #define LOUDNESS(energy) (-0.691 + 10 * log10(energy))
392 static struct hist_entry *get_histogram(void)
395 struct hist_entry *h = av_calloc(HIST_SIZE, sizeof(*h));
399 for (i = 0; i < HIST_SIZE; i++) {
400 h[i].loudness = i / (double)HIST_GRAIN + ABS_THRES;
401 h[i].energy = ENERGY(h[i].loudness);
406 static av_cold int init(AVFilterContext *ctx, const char *args)
409 EBUR128Context *ebur128 = ctx->priv;
412 ebur128->class = &ebur128_class;
413 av_opt_set_defaults(ebur128);
415 if ((ret = av_set_options_string(ebur128, args, "=", ":")) < 0)
418 if (ebur128->loglevel != AV_LOG_INFO &&
419 ebur128->loglevel != AV_LOG_VERBOSE) {
420 if (ebur128->do_video || ebur128->metadata)
421 ebur128->loglevel = AV_LOG_VERBOSE;
423 ebur128->loglevel = AV_LOG_INFO;
426 // if meter is +9 scale, scale range is from -18 LU to +9 LU (or 3*9)
427 // if meter is +18 scale, scale range is from -36 LU to +18 LU (or 3*18)
428 ebur128->scale_range = 3 * ebur128->meter;
430 ebur128->i400.histogram = get_histogram();
431 ebur128->i3000.histogram = get_histogram();
432 if (!ebur128->i400.histogram || !ebur128->i3000.histogram)
433 return AVERROR(ENOMEM);
435 ebur128->integrated_loudness = ABS_THRES;
436 ebur128->loudness_range = 0;
438 /* insert output pads */
439 if (ebur128->do_video) {
441 .name = av_strdup("out0"),
442 .type = AVMEDIA_TYPE_VIDEO,
443 .config_props = config_video_output,
446 return AVERROR(ENOMEM);
447 ff_insert_outpad(ctx, 0, &pad);
450 .name = av_asprintf("out%d", ebur128->do_video),
451 .type = AVMEDIA_TYPE_AUDIO,
452 .config_props = config_audio_output,
455 return AVERROR(ENOMEM);
456 ff_insert_outpad(ctx, ebur128->do_video, &pad);
459 av_log(ctx, AV_LOG_VERBOSE, "EBU +%d scale\n", ebur128->meter);
464 #define HIST_POS(power) (int)(((power) - ABS_THRES) * HIST_GRAIN)
466 /* loudness and power should be set such as loudness = -0.691 +
467 * 10*log10(power), we just avoid doing that calculus two times */
468 static int gate_update(struct integrator *integ, double power,
469 double loudness, int gate_thres)
472 double relative_threshold;
475 /* update powers histograms by incrementing current power count */
476 ipower = av_clip(HIST_POS(loudness), 0, HIST_SIZE - 1);
477 integ->histogram[ipower].count++;
479 /* compute relative threshold and get its position in the histogram */
480 integ->sum_kept_powers += power;
481 integ->nb_kept_powers++;
482 relative_threshold = integ->sum_kept_powers / integ->nb_kept_powers;
483 if (!relative_threshold)
484 relative_threshold = 1e-12;
485 integ->rel_threshold = LOUDNESS(relative_threshold) + gate_thres;
486 gate_hist_pos = av_clip(HIST_POS(integ->rel_threshold), 0, HIST_SIZE - 1);
488 return gate_hist_pos;
491 static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
493 int i, ch, idx_insample;
494 AVFilterContext *ctx = inlink->dst;
495 EBUR128Context *ebur128 = ctx->priv;
496 const int nb_channels = ebur128->nb_channels;
497 const int nb_samples = insamples->nb_samples;
498 const double *samples = (double *)insamples->data[0];
499 AVFrame *pic = ebur128->outpicref;
501 for (idx_insample = 0; idx_insample < nb_samples; idx_insample++) {
502 const int bin_id_400 = ebur128->i400.cache_pos;
503 const int bin_id_3000 = ebur128->i3000.cache_pos;
505 #define MOVE_TO_NEXT_CACHED_ENTRY(time) do { \
506 ebur128->i##time.cache_pos++; \
507 if (ebur128->i##time.cache_pos == I##time##_BINS) { \
508 ebur128->i##time.filled = 1; \
509 ebur128->i##time.cache_pos = 0; \
513 MOVE_TO_NEXT_CACHED_ENTRY(400);
514 MOVE_TO_NEXT_CACHED_ENTRY(3000);
516 for (ch = 0; ch < nb_channels; ch++) {
519 ebur128->x[ch * 3] = *samples++; // set X[i]
521 if (!ebur128->ch_weighting[ch])
524 /* Y[i] = X[i]*b0 + X[i-1]*b1 + X[i-2]*b2 - Y[i-1]*a1 - Y[i-2]*a2 */
525 #define FILTER(Y, X, name) do { \
526 double *dst = ebur128->Y + ch*3; \
527 double *src = ebur128->X + ch*3; \
530 dst[0] = src[0]*name##_B0 + src[1]*name##_B1 + src[2]*name##_B2 \
531 - dst[1]*name##_A1 - dst[2]*name##_A2; \
534 // TODO: merge both filters in one?
535 FILTER(y, x, PRE); // apply pre-filter
536 ebur128->x[ch * 3 + 2] = ebur128->x[ch * 3 + 1];
537 ebur128->x[ch * 3 + 1] = ebur128->x[ch * 3 ];
538 FILTER(z, y, RLB); // apply RLB-filter
540 bin = ebur128->z[ch * 3] * ebur128->z[ch * 3];
542 /* add the new value, and limit the sum to the cache size (400ms or 3s)
543 * by removing the oldest one */
544 ebur128->i400.sum [ch] = ebur128->i400.sum [ch] + bin - ebur128->i400.cache [ch][bin_id_400];
545 ebur128->i3000.sum[ch] = ebur128->i3000.sum[ch] + bin - ebur128->i3000.cache[ch][bin_id_3000];
547 /* override old cache entry with the new value */
548 ebur128->i400.cache [ch][bin_id_400 ] = bin;
549 ebur128->i3000.cache[ch][bin_id_3000] = bin;
552 /* For integrated loudness, gating blocks are 400ms long with 75%
553 * overlap (see BS.1770-2 p5), so a re-computation is needed each 100ms
554 * (4800 samples at 48kHz). */
555 if (++ebur128->sample_count == 4800) {
556 double loudness_400, loudness_3000;
557 double power_400 = 1e-12, power_3000 = 1e-12;
558 AVFilterLink *outlink = ctx->outputs[0];
559 const int64_t pts = insamples->pts +
560 av_rescale_q(idx_insample, (AVRational){ 1, inlink->sample_rate },
563 ebur128->sample_count = 0;
565 #define COMPUTE_LOUDNESS(m, time) do { \
566 if (ebur128->i##time.filled) { \
567 /* weighting sum of the last <time> ms */ \
568 for (ch = 0; ch < nb_channels; ch++) \
569 power_##time += ebur128->ch_weighting[ch] * ebur128->i##time.sum[ch]; \
570 power_##time /= I##time##_BINS; \
572 loudness_##time = LOUDNESS(power_##time); \
575 COMPUTE_LOUDNESS(M, 400);
576 COMPUTE_LOUDNESS(S, 3000);
578 /* Integrated loudness */
579 #define I_GATE_THRES -10 // initially defined to -8 LU in the first EBU standard
581 if (loudness_400 >= ABS_THRES) {
582 double integrated_sum = 0;
583 int nb_integrated = 0;
584 int gate_hist_pos = gate_update(&ebur128->i400, power_400,
585 loudness_400, I_GATE_THRES);
587 /* compute integrated loudness by summing the histogram values
588 * above the relative threshold */
589 for (i = gate_hist_pos; i < HIST_SIZE; i++) {
590 const int nb_v = ebur128->i400.histogram[i].count;
591 nb_integrated += nb_v;
592 integrated_sum += nb_v * ebur128->i400.histogram[i].energy;
595 ebur128->integrated_loudness = LOUDNESS(integrated_sum / nb_integrated);
599 #define LRA_GATE_THRES -20
600 #define LRA_LOWER_PRC 10
601 #define LRA_HIGHER_PRC 95
603 /* XXX: example code in EBU 3342 is ">=" but formula in BS.1770
605 if (loudness_3000 >= ABS_THRES) {
607 int gate_hist_pos = gate_update(&ebur128->i3000, power_3000,
608 loudness_3000, LRA_GATE_THRES);
610 for (i = gate_hist_pos; i < HIST_SIZE; i++)
611 nb_powers += ebur128->i3000.histogram[i].count;
615 /* get lower loudness to consider */
617 nb_pow = LRA_LOWER_PRC * nb_powers / 100. + 0.5;
618 for (i = gate_hist_pos; i < HIST_SIZE; i++) {
619 n += ebur128->i3000.histogram[i].count;
621 ebur128->lra_low = ebur128->i3000.histogram[i].loudness;
626 /* get higher loudness to consider */
628 nb_pow = LRA_HIGHER_PRC * nb_powers / 100. + 0.5;
629 for (i = HIST_SIZE - 1; i >= 0; i--) {
630 n -= ebur128->i3000.histogram[i].count;
632 ebur128->lra_high = ebur128->i3000.histogram[i].loudness;
637 // XXX: show low & high on the graph?
638 ebur128->loudness_range = ebur128->lra_high - ebur128->lra_low;
642 #define LOG_FMT "M:%6.1f S:%6.1f I:%6.1f LUFS LRA:%6.1f LU"
644 /* push one video frame */
645 if (ebur128->do_video) {
649 const int y_loudness_lu_graph = lu_to_y(ebur128, loudness_3000 + 23);
650 const int y_loudness_lu_gauge = lu_to_y(ebur128, loudness_400 + 23);
652 /* draw the graph using the short-term loudness */
653 p = pic->data[0] + ebur128->graph.y*pic->linesize[0] + ebur128->graph.x*3;
654 for (y = 0; y < ebur128->graph.h; y++) {
655 const uint8_t *c = get_graph_color(ebur128, y_loudness_lu_graph, y);
657 memmove(p, p + 3, (ebur128->graph.w - 1) * 3);
658 memcpy(p + (ebur128->graph.w - 1) * 3, c, 3);
659 p += pic->linesize[0];
662 /* draw the gauge using the momentary loudness */
663 p = pic->data[0] + ebur128->gauge.y*pic->linesize[0] + ebur128->gauge.x*3;
664 for (y = 0; y < ebur128->gauge.h; y++) {
665 const uint8_t *c = get_graph_color(ebur128, y_loudness_lu_gauge, y);
667 for (x = 0; x < ebur128->gauge.w; x++)
668 memcpy(p + x*3, c, 3);
669 p += pic->linesize[0];
672 /* draw textual info */
673 drawtext(pic, PAD, PAD - PAD/2, FONT16, font_colors,
674 LOG_FMT " ", // padding to erase trailing characters
675 loudness_400, loudness_3000,
676 ebur128->integrated_loudness, ebur128->loudness_range);
678 /* set pts and push frame */
680 ret = ff_filter_frame(outlink, av_frame_clone(pic));
685 if (ebur128->metadata) { /* happens only once per filter_frame call */
687 #define SET_META(name, var) do { \
688 snprintf(metabuf, sizeof(metabuf), "%.3f", var); \
689 av_dict_set(&insamples->metadata, "lavfi.r128." name, metabuf, 0); \
691 SET_META("M", loudness_400);
692 SET_META("S", loudness_3000);
693 SET_META("I", ebur128->integrated_loudness);
694 SET_META("LRA", ebur128->loudness_range);
695 SET_META("LRA.low", ebur128->lra_low);
696 SET_META("LRA.high", ebur128->lra_high);
699 av_log(ctx, ebur128->loglevel, "t: %-10s " LOG_FMT "\n",
700 av_ts2timestr(pts, &outlink->time_base),
701 loudness_400, loudness_3000,
702 ebur128->integrated_loudness, ebur128->loudness_range);
706 return ff_filter_frame(ctx->outputs[ebur128->do_video], insamples);
709 static int query_formats(AVFilterContext *ctx)
711 EBUR128Context *ebur128 = ctx->priv;
712 AVFilterFormats *formats;
713 AVFilterChannelLayouts *layouts;
714 AVFilterLink *inlink = ctx->inputs[0];
715 AVFilterLink *outlink = ctx->outputs[0];
717 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_NONE };
718 static const int input_srate[] = {48000, -1}; // ITU-R BS.1770 provides coeff only for 48kHz
719 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE };
721 /* set optional output video format */
722 if (ebur128->do_video) {
723 formats = ff_make_format_list(pix_fmts);
725 return AVERROR(ENOMEM);
726 ff_formats_ref(formats, &outlink->in_formats);
727 outlink = ctx->outputs[1];
730 /* set input and output audio formats
731 * Note: ff_set_common_* functions are not used because they affect all the
732 * links, and thus break the video format negociation */
733 formats = ff_make_format_list(sample_fmts);
735 return AVERROR(ENOMEM);
736 ff_formats_ref(formats, &inlink->out_formats);
737 ff_formats_ref(formats, &outlink->in_formats);
739 layouts = ff_all_channel_layouts();
741 return AVERROR(ENOMEM);
742 ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
743 ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts);
745 formats = ff_make_format_list(input_srate);
747 return AVERROR(ENOMEM);
748 ff_formats_ref(formats, &inlink->out_samplerates);
749 ff_formats_ref(formats, &outlink->in_samplerates);
754 static av_cold void uninit(AVFilterContext *ctx)
757 EBUR128Context *ebur128 = ctx->priv;
759 av_log(ctx, AV_LOG_INFO, "Summary:\n\n"
760 " Integrated loudness:\n"
762 " Threshold: %5.1f LUFS\n\n"
765 " Threshold: %5.1f LUFS\n"
766 " LRA low: %5.1f LUFS\n"
767 " LRA high: %5.1f LUFS\n",
768 ebur128->integrated_loudness, ebur128->i400.rel_threshold,
769 ebur128->loudness_range, ebur128->i3000.rel_threshold,
770 ebur128->lra_low, ebur128->lra_high);
772 av_freep(&ebur128->y_line_ref);
773 av_freep(&ebur128->ch_weighting);
774 av_freep(&ebur128->i400.histogram);
775 av_freep(&ebur128->i3000.histogram);
776 for (i = 0; i < ebur128->nb_channels; i++) {
777 av_freep(&ebur128->i400.cache[i]);
778 av_freep(&ebur128->i3000.cache[i]);
780 for (i = 0; i < ctx->nb_outputs; i++)
781 av_freep(&ctx->output_pads[i].name);
782 av_frame_free(&ebur128->outpicref);
783 av_opt_free(ebur128);
786 static const AVFilterPad ebur128_inputs[] = {
789 .type = AVMEDIA_TYPE_AUDIO,
790 .get_audio_buffer = ff_null_get_audio_buffer,
791 .filter_frame = filter_frame,
792 .config_props = config_audio_input,
797 AVFilter avfilter_af_ebur128 = {
799 .description = NULL_IF_CONFIG_SMALL("EBU R128 scanner."),
800 .priv_size = sizeof(EBUR128Context),
803 .query_formats = query_formats,
804 .inputs = ebur128_inputs,
806 .priv_class = &ebur128_class,