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/xga_font_data.h"
37 #include "libavutil/opt.h"
38 #include "libavutil/timestamp.h"
44 #define MAX_CHANNELS 63
46 /* pre-filter coefficients */
47 #define PRE_B0 1.53512485958697
48 #define PRE_B1 -2.69169618940638
49 #define PRE_B2 1.19839281085285
50 #define PRE_A1 -1.69065929318241
51 #define PRE_A2 0.73248077421585
53 /* RLB-filter coefficients */
57 #define RLB_A1 -1.99004745483398
58 #define RLB_A2 0.99007225036621
60 #define ABS_THRES -70 ///< silence gate: we discard anything below this absolute (LUFS) threshold
61 #define ABS_UP_THRES 10 ///< upper loud limit to consider (ABS_THRES being the minimum)
62 #define HIST_GRAIN 100 ///< defines histogram precision
63 #define HIST_SIZE ((ABS_UP_THRES - ABS_THRES) * HIST_GRAIN + 1)
66 * An histogram is an array of HIST_SIZE hist_entry storing all the energies
67 * recorded (with an accuracy of 1/HIST_GRAIN) of the loudnesses from ABS_THRES
68 * (at 0) to ABS_UP_THRES (at HIST_SIZE-1).
69 * This fixed-size system avoids the need of a list of energies growing
70 * infinitely over the time and is thus more scalable.
73 int count; ///< how many times the corresponding value occurred
74 double energy; ///< E = 10^((L + 0.691) / 10)
75 double loudness; ///< L = -0.691 + 10 * log10(E)
79 double *cache[MAX_CHANNELS]; ///< window of filtered samples (N ms)
80 int cache_pos; ///< focus on the last added bin in the cache array
81 double sum[MAX_CHANNELS]; ///< sum of the last N ms filtered samples (cache content)
82 int filled; ///< 1 if the cache is completely filled, 0 otherwise
83 double rel_threshold; ///< relative threshold
84 double sum_kept_powers; ///< sum of the powers (weighted sums) above absolute threshold
85 int nb_kept_powers; ///< number of sum above absolute threshold
86 struct hist_entry *histogram; ///< histogram of the powers, used to compute LRA and I
89 struct rect { int x, y, w, h; };
92 const AVClass *class; ///< AVClass context for log and options purpose
95 int do_video; ///< 1 if video output enabled, 0 otherwise
96 int w, h; ///< size of the video output
97 struct rect text; ///< rectangle for the LU legend on the left
98 struct rect graph; ///< rectangle for the main graph in the center
99 struct rect gauge; ///< rectangle for the gauge on the right
100 AVFilterBufferRef *outpicref; ///< output picture reference, updated regularly
101 int meter; ///< select a EBU mode between +9 and +18
102 int scale_range; ///< the range of LU values according to the meter
103 int y_zero_lu; ///< the y value (pixel position) for 0 LU
104 int *y_line_ref; ///< y reference values for drawing the LU lines in the graph and the gauge
107 int nb_channels; ///< number of channels in the input
108 double *ch_weighting; ///< channel weighting mapping
109 int sample_count; ///< sample count used for refresh frequency, reset at refresh
112 * The mult by 3 in the following is for X[i], X[i-1] and X[i-2] */
113 double x[MAX_CHANNELS * 3]; ///< 3 input samples cache for each channel
114 double y[MAX_CHANNELS * 3]; ///< 3 pre-filter samples cache for each channel
115 double z[MAX_CHANNELS * 3]; ///< 3 RLB-filter samples cache for each channel
117 #define I400_BINS (48000 * 4 / 10)
118 #define I3000_BINS (48000 * 3)
119 struct integrator i400; ///< 400ms integrator, used for Momentary loudness (M), and Integrated loudness (I)
120 struct integrator i3000; ///< 3s integrator, used for Short term loudness (S), and Loudness Range (LRA)
122 /* I and LRA specific */
123 double integrated_loudness; ///< integrated loudness in LUFS (I)
124 double loudness_range; ///< loudness range in LU (LRA)
125 double lra_low, lra_high; ///< low and high LRA values
128 #define OFFSET(x) offsetof(EBUR128Context, x)
129 #define A AV_OPT_FLAG_AUDIO_PARAM
130 #define V AV_OPT_FLAG_VIDEO_PARAM
131 #define F AV_OPT_FLAG_FILTERING_PARAM
132 static const AVOption ebur128_options[] = {
133 { "video", "set video output", OFFSET(do_video), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, V|F },
134 { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x480"}, 0, 0, V|F },
135 { "meter", "set scale meter (+9 to +18)", OFFSET(meter), AV_OPT_TYPE_INT, {.i64 = 9}, 9, 18, V|F },
139 AVFILTER_DEFINE_CLASS(ebur128);
141 static const uint8_t graph_colors[] = {
142 0xdd, 0x66, 0x66, // value above 0LU non reached
143 0x66, 0x66, 0xdd, // value below 0LU non reached
144 0x96, 0x33, 0x33, // value above 0LU reached
145 0x33, 0x33, 0x96, // value below 0LU reached
146 0xdd, 0x96, 0x96, // value above 0LU line non reached
147 0x96, 0x96, 0xdd, // value below 0LU line non reached
148 0xdd, 0x33, 0x33, // value above 0LU line reached
149 0x33, 0x33, 0xdd, // value below 0LU line reached
152 static const uint8_t *get_graph_color(const EBUR128Context *ebur128, int v, int y)
154 const int below0 = y > ebur128->y_zero_lu;
155 const int reached = y >= v;
156 const int line = ebur128->y_line_ref[y] || y == ebur128->y_zero_lu;
157 const int colorid = 4*line + 2*reached + below0;
158 return graph_colors + 3*colorid;
161 static inline int lu_to_y(const EBUR128Context *ebur128, double v)
163 v += 2 * ebur128->meter; // make it in range [0;...]
164 v = av_clipf(v, 0, ebur128->scale_range); // make sure it's in the graph scale
165 v = ebur128->scale_range - v; // invert value (y=0 is on top)
166 return v * ebur128->graph.h / ebur128->scale_range; // rescale from scale range to px height
172 static const uint8_t font_colors[] = {
177 static void drawtext(AVFilterBufferRef *pic, int x, int y, int ftid, const uint8_t *color, const char *fmt, ...)
185 if (ftid == FONT16) font = avpriv_vga16_font, font_height = 16;
186 else if (ftid == FONT8) font = avpriv_cga_font, font_height = 8;
190 vsnprintf(buf, sizeof(buf), fmt, vl);
193 for (i = 0; buf[i]; i++) {
195 uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8)*3;
197 for (char_y = 0; char_y < font_height; char_y++) {
198 for (mask = 0x80; mask; mask >>= 1) {
199 if (font[buf[i] * font_height + char_y] & mask)
202 memcpy(p, "\x00\x00\x00", 3);
205 p += pic->linesize[0] - 8*3;
210 static void drawline(AVFilterBufferRef *pic, int x, int y, int len, int step)
213 uint8_t *p = pic->data[0] + y*pic->linesize[0] + x*3;
215 for (i = 0; i < len; i++) {
216 memcpy(p, "\x00\xff\x00", 3);
221 static int config_video_output(AVFilterLink *outlink)
225 AVFilterContext *ctx = outlink->src;
226 EBUR128Context *ebur128 = ctx->priv;
227 AVFilterBufferRef *outpicref;
229 /* check if there is enough space to represent everything decently */
230 if (ebur128->w < 640 || ebur128->h < 480) {
231 av_log(ctx, AV_LOG_ERROR, "Video size %dx%d is too small, "
232 "minimum size is 640x480\n", ebur128->w, ebur128->h);
233 return AVERROR(EINVAL);
235 outlink->w = ebur128->w;
236 outlink->h = ebur128->h;
240 /* configure text area position and size */
241 ebur128->text.x = PAD;
242 ebur128->text.y = 40;
243 ebur128->text.w = 3 * 8; // 3 characters
244 ebur128->text.h = ebur128->h - PAD - ebur128->text.y;
246 /* configure gauge position and size */
247 ebur128->gauge.w = 20;
248 ebur128->gauge.h = ebur128->text.h;
249 ebur128->gauge.x = ebur128->w - PAD - ebur128->gauge.w;
250 ebur128->gauge.y = ebur128->text.y;
252 /* configure graph position and size */
253 ebur128->graph.x = ebur128->text.x + ebur128->text.w + PAD;
254 ebur128->graph.y = ebur128->gauge.y;
255 ebur128->graph.w = ebur128->gauge.x - ebur128->graph.x - PAD;
256 ebur128->graph.h = ebur128->gauge.h;
258 /* graph and gauge share the LU-to-pixel code */
259 av_assert0(ebur128->graph.h == ebur128->gauge.h);
261 /* prepare the initial picref buffer */
262 avfilter_unref_bufferp(&ebur128->outpicref);
263 ebur128->outpicref = outpicref =
264 ff_get_video_buffer(outlink, AV_PERM_WRITE|AV_PERM_PRESERVE|AV_PERM_REUSE2,
265 outlink->w, outlink->h);
267 return AVERROR(ENOMEM);
268 outlink->sample_aspect_ratio = (AVRational){1,1};
270 /* init y references values (to draw LU lines) */
271 ebur128->y_line_ref = av_calloc(ebur128->graph.h + 1, sizeof(*ebur128->y_line_ref));
272 if (!ebur128->y_line_ref)
273 return AVERROR(ENOMEM);
275 /* black background */
276 memset(outpicref->data[0], 0, ebur128->h * outpicref->linesize[0]);
278 /* draw LU legends */
279 drawtext(outpicref, PAD, PAD+16, FONT8, font_colors+3, " LU");
280 for (i = ebur128->meter; i >= -ebur128->meter * 2; i--) {
281 y = lu_to_y(ebur128, i);
282 x = PAD + (i < 10 && i > -10) * 8;
283 ebur128->y_line_ref[y] = i;
284 y -= 4; // -4 to center vertically
285 drawtext(outpicref, x, y + ebur128->graph.y, FONT8, font_colors+3,
286 "%c%d", i < 0 ? '-' : i > 0 ? '+' : ' ', FFABS(i));
290 ebur128->y_zero_lu = lu_to_y(ebur128, 0);
291 p = outpicref->data[0] + ebur128->graph.y * outpicref->linesize[0]
292 + ebur128->graph.x * 3;
293 for (y = 0; y < ebur128->graph.h; y++) {
294 const uint8_t *c = get_graph_color(ebur128, INT_MAX, y);
296 for (x = 0; x < ebur128->graph.w; x++)
297 memcpy(p + x*3, c, 3);
298 p += outpicref->linesize[0];
301 /* draw fancy rectangles around the graph and the gauge */
302 #define DRAW_RECT(r) do { \
303 drawline(outpicref, r.x, r.y - 1, r.w, 3); \
304 drawline(outpicref, r.x, r.y + r.h, r.w, 3); \
305 drawline(outpicref, r.x - 1, r.y, r.h, outpicref->linesize[0]); \
306 drawline(outpicref, r.x + r.w, r.y, r.h, outpicref->linesize[0]); \
308 DRAW_RECT(ebur128->graph);
309 DRAW_RECT(ebur128->gauge);
314 static int config_audio_output(AVFilterLink *outlink)
318 AVFilterContext *ctx = outlink->src;
319 EBUR128Context *ebur128 = ctx->priv;
320 const int nb_channels = av_get_channel_layout_nb_channels(outlink->channel_layout);
322 #define BACK_MASK (AV_CH_BACK_LEFT |AV_CH_BACK_CENTER |AV_CH_BACK_RIGHT| \
323 AV_CH_TOP_BACK_LEFT|AV_CH_TOP_BACK_CENTER|AV_CH_TOP_BACK_RIGHT| \
324 AV_CH_SIDE_LEFT |AV_CH_SIDE_RIGHT| \
325 AV_CH_SURROUND_DIRECT_LEFT |AV_CH_SURROUND_DIRECT_RIGHT)
327 ebur128->nb_channels = nb_channels;
328 ebur128->ch_weighting = av_calloc(nb_channels, sizeof(*ebur128->ch_weighting));
329 if (!ebur128->ch_weighting)
330 return AVERROR(ENOMEM);
332 for (i = 0; i < nb_channels; i++) {
334 /* find the next bit that is set starting from the right */
335 while ((outlink->channel_layout & 1ULL<<idx_bitposn) == 0 && idx_bitposn < 63)
338 /* channel weighting */
339 if ((1ULL<<idx_bitposn & AV_CH_LOW_FREQUENCY) ||
340 (1ULL<<idx_bitposn & AV_CH_LOW_FREQUENCY_2)) {
341 ebur128->ch_weighting[i] = 0;
342 } else if (1ULL<<idx_bitposn & BACK_MASK) {
343 ebur128->ch_weighting[i] = 1.41;
345 ebur128->ch_weighting[i] = 1.0;
350 if (!ebur128->ch_weighting[i])
353 /* bins buffer for the two integration window (400ms and 3s) */
354 ebur128->i400.cache[i] = av_calloc(I400_BINS, sizeof(*ebur128->i400.cache[0]));
355 ebur128->i3000.cache[i] = av_calloc(I3000_BINS, sizeof(*ebur128->i3000.cache[0]));
356 if (!ebur128->i400.cache[i] || !ebur128->i3000.cache[i])
357 return AVERROR(ENOMEM);
363 #define ENERGY(loudness) (pow(10, ((loudness) + 0.691) / 10.))
364 #define LOUDNESS(energy) (-0.691 + 10 * log10(energy))
366 static struct hist_entry *get_histogram(void)
369 struct hist_entry *h = av_calloc(HIST_SIZE, sizeof(*h));
371 for (i = 0; i < HIST_SIZE; i++) {
372 h[i].loudness = i / (double)HIST_GRAIN + ABS_THRES;
373 h[i].energy = ENERGY(h[i].loudness);
378 static av_cold int init(AVFilterContext *ctx, const char *args)
381 EBUR128Context *ebur128 = ctx->priv;
384 ebur128->class = &ebur128_class;
385 av_opt_set_defaults(ebur128);
387 if ((ret = av_set_options_string(ebur128, args, "=", ":")) < 0)
390 // if meter is +9 scale, scale range is from -18 LU to +9 LU (or 3*9)
391 // if meter is +18 scale, scale range is from -36 LU to +18 LU (or 3*18)
392 ebur128->scale_range = 3 * ebur128->meter;
394 ebur128->i400.histogram = get_histogram();
395 ebur128->i3000.histogram = get_histogram();
397 ebur128->integrated_loudness = ABS_THRES;
398 ebur128->loudness_range = 0;
400 /* insert output pads */
401 if (ebur128->do_video) {
403 .name = av_strdup("out0"),
404 .type = AVMEDIA_TYPE_VIDEO,
405 .config_props = config_video_output,
408 return AVERROR(ENOMEM);
409 ff_insert_outpad(ctx, 0, &pad);
412 .name = av_asprintf("out%d", ebur128->do_video),
413 .type = AVMEDIA_TYPE_AUDIO,
414 .config_props = config_audio_output,
417 return AVERROR(ENOMEM);
418 ff_insert_outpad(ctx, ebur128->do_video, &pad);
421 av_log(ctx, AV_LOG_VERBOSE, "EBU +%d scale\n", ebur128->meter);
426 #define HIST_POS(power) (int)(((power) - ABS_THRES) * HIST_GRAIN)
428 /* loudness and power should be set such as loudness = -0.691 +
429 * 10*log10(power), we just avoid doing that calculus two times */
430 static int gate_update(struct integrator *integ, double power,
431 double loudness, int gate_thres)
434 double relative_threshold;
437 /* update powers histograms by incrementing current power count */
438 ipower = av_clip(HIST_POS(loudness), 0, HIST_SIZE - 1);
439 integ->histogram[ipower].count++;
441 /* compute relative threshold and get its position in the histogram */
442 integ->sum_kept_powers += power;
443 integ->nb_kept_powers++;
444 relative_threshold = integ->sum_kept_powers / integ->nb_kept_powers;
445 if (!relative_threshold)
446 relative_threshold = 1e-12;
447 integ->rel_threshold = LOUDNESS(relative_threshold) + gate_thres;
448 gate_hist_pos = av_clip(HIST_POS(integ->rel_threshold), 0, HIST_SIZE - 1);
450 return gate_hist_pos;
453 static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *insamples)
455 int i, ch, idx_insample;
456 AVFilterContext *ctx = inlink->dst;
457 EBUR128Context *ebur128 = ctx->priv;
458 const int nb_channels = ebur128->nb_channels;
459 const int nb_samples = insamples->audio->nb_samples;
460 const double *samples = (double *)insamples->data[0];
461 AVFilterBufferRef *pic = ebur128->outpicref;
463 for (idx_insample = 0; idx_insample < nb_samples; idx_insample++) {
464 const int bin_id_400 = ebur128->i400.cache_pos;
465 const int bin_id_3000 = ebur128->i3000.cache_pos;
467 #define MOVE_TO_NEXT_CACHED_ENTRY(time) do { \
468 ebur128->i##time.cache_pos++; \
469 if (ebur128->i##time.cache_pos == I##time##_BINS) { \
470 ebur128->i##time.filled = 1; \
471 ebur128->i##time.cache_pos = 0; \
475 MOVE_TO_NEXT_CACHED_ENTRY(400);
476 MOVE_TO_NEXT_CACHED_ENTRY(3000);
478 for (ch = 0; ch < nb_channels; ch++) {
481 ebur128->x[ch * 3] = *samples++; // set X[i]
483 if (!ebur128->ch_weighting[ch])
486 /* Y[i] = X[i]*b0 + X[i-1]*b1 + X[i-2]*b2 - Y[i-1]*a1 - Y[i-2]*a2 */
487 #define FILTER(Y, X, name) do { \
488 double *dst = ebur128->Y + ch*3; \
489 double *src = ebur128->X + ch*3; \
492 dst[0] = src[0]*name##_B0 + src[1]*name##_B1 + src[2]*name##_B2 \
493 - dst[1]*name##_A1 - dst[2]*name##_A2; \
496 // TODO: merge both filters in one?
497 FILTER(y, x, PRE); // apply pre-filter
498 ebur128->x[ch * 3 + 2] = ebur128->x[ch * 3 + 1];
499 ebur128->x[ch * 3 + 1] = ebur128->x[ch * 3 ];
500 FILTER(z, y, RLB); // apply RLB-filter
502 bin = ebur128->z[ch * 3] * ebur128->z[ch * 3];
504 /* add the new value, and limit the sum to the cache size (400ms or 3s)
505 * by removing the oldest one */
506 ebur128->i400.sum [ch] = ebur128->i400.sum [ch] + bin - ebur128->i400.cache [ch][bin_id_400];
507 ebur128->i3000.sum[ch] = ebur128->i3000.sum[ch] + bin - ebur128->i3000.cache[ch][bin_id_3000];
509 /* override old cache entry with the new value */
510 ebur128->i400.cache [ch][bin_id_400 ] = bin;
511 ebur128->i3000.cache[ch][bin_id_3000] = bin;
514 /* For integrated loudness, gating blocks are 400ms long with 75%
515 * overlap (see BS.1770-2 p5), so a re-computation is needed each 100ms
516 * (4800 samples at 48kHz). */
517 if (++ebur128->sample_count == 4800) {
518 double loudness_400, loudness_3000;
519 double power_400 = 1e-12, power_3000 = 1e-12;
520 AVFilterLink *outlink = ctx->outputs[0];
521 const int64_t pts = insamples->pts +
522 av_rescale_q(idx_insample, (AVRational){ 1, inlink->sample_rate },
525 ebur128->sample_count = 0;
527 #define COMPUTE_LOUDNESS(m, time) do { \
528 if (ebur128->i##time.filled) { \
529 /* weighting sum of the last <time> ms */ \
530 for (ch = 0; ch < nb_channels; ch++) \
531 power_##time += ebur128->ch_weighting[ch] * ebur128->i##time.sum[ch]; \
532 power_##time /= I##time##_BINS; \
534 loudness_##time = LOUDNESS(power_##time); \
537 COMPUTE_LOUDNESS(M, 400);
538 COMPUTE_LOUDNESS(S, 3000);
540 /* Integrated loudness */
541 #define I_GATE_THRES -10 // initially defined to -8 LU in the first EBU standard
543 if (loudness_400 >= ABS_THRES) {
544 double integrated_sum = 0;
545 int nb_integrated = 0;
546 int gate_hist_pos = gate_update(&ebur128->i400, power_400,
547 loudness_400, I_GATE_THRES);
549 /* compute integrated loudness by summing the histogram values
550 * above the relative threshold */
551 for (i = gate_hist_pos; i < HIST_SIZE; i++) {
552 const int nb_v = ebur128->i400.histogram[i].count;
553 nb_integrated += nb_v;
554 integrated_sum += nb_v * ebur128->i400.histogram[i].energy;
557 ebur128->integrated_loudness = LOUDNESS(integrated_sum / nb_integrated);
561 #define LRA_GATE_THRES -20
562 #define LRA_LOWER_PRC 10
563 #define LRA_HIGHER_PRC 95
565 /* XXX: example code in EBU 3342 is ">=" but formula in BS.1770
567 if (loudness_3000 >= ABS_THRES) {
569 int gate_hist_pos = gate_update(&ebur128->i3000, power_3000,
570 loudness_3000, LRA_GATE_THRES);
572 for (i = gate_hist_pos; i < HIST_SIZE; i++)
573 nb_powers += ebur128->i3000.histogram[i].count;
577 /* get lower loudness to consider */
579 nb_pow = LRA_LOWER_PRC * nb_powers / 100. + 0.5;
580 for (i = gate_hist_pos; i < HIST_SIZE; i++) {
581 n += ebur128->i3000.histogram[i].count;
583 ebur128->lra_low = ebur128->i3000.histogram[i].loudness;
588 /* get higher loudness to consider */
590 nb_pow = LRA_HIGHER_PRC * nb_powers / 100. + 0.5;
591 for (i = HIST_SIZE - 1; i >= 0; i--) {
592 n -= ebur128->i3000.histogram[i].count;
594 ebur128->lra_high = ebur128->i3000.histogram[i].loudness;
599 // XXX: show low & high on the graph?
600 ebur128->loudness_range = ebur128->lra_high - ebur128->lra_low;
604 #define LOG_FMT "M:%6.1f S:%6.1f I:%6.1f LUFS LRA:%6.1f LU"
606 /* push one video frame */
607 if (ebur128->do_video) {
611 const int y_loudness_lu_graph = lu_to_y(ebur128, loudness_3000 + 23);
612 const int y_loudness_lu_gauge = lu_to_y(ebur128, loudness_400 + 23);
614 /* draw the graph using the short-term loudness */
615 p = pic->data[0] + ebur128->graph.y*pic->linesize[0] + ebur128->graph.x*3;
616 for (y = 0; y < ebur128->graph.h; y++) {
617 const uint8_t *c = get_graph_color(ebur128, y_loudness_lu_graph, y);
619 memmove(p, p + 3, (ebur128->graph.w - 1) * 3);
620 memcpy(p + (ebur128->graph.w - 1) * 3, c, 3);
621 p += pic->linesize[0];
624 /* draw the gauge using the momentary loudness */
625 p = pic->data[0] + ebur128->gauge.y*pic->linesize[0] + ebur128->gauge.x*3;
626 for (y = 0; y < ebur128->gauge.h; y++) {
627 const uint8_t *c = get_graph_color(ebur128, y_loudness_lu_gauge, y);
629 for (x = 0; x < ebur128->gauge.w; x++)
630 memcpy(p + x*3, c, 3);
631 p += pic->linesize[0];
634 /* draw textual info */
635 drawtext(pic, PAD, PAD - PAD/2, FONT16, font_colors,
636 LOG_FMT " ", // padding to erase trailing characters
637 loudness_400, loudness_3000,
638 ebur128->integrated_loudness, ebur128->loudness_range);
640 /* set pts and push frame */
642 ret = ff_filter_frame(outlink, avfilter_ref_buffer(pic, ~AV_PERM_WRITE));
647 av_log(ctx, ebur128->do_video ? AV_LOG_VERBOSE : AV_LOG_INFO,
648 "t: %-10s " LOG_FMT "\n", av_ts2timestr(pts, &outlink->time_base),
649 loudness_400, loudness_3000,
650 ebur128->integrated_loudness, ebur128->loudness_range);
654 return ff_filter_frame(ctx->outputs[ebur128->do_video], insamples);
657 static int query_formats(AVFilterContext *ctx)
659 EBUR128Context *ebur128 = ctx->priv;
660 AVFilterFormats *formats;
661 AVFilterChannelLayouts *layouts;
662 AVFilterLink *inlink = ctx->inputs[0];
663 AVFilterLink *outlink = ctx->outputs[0];
665 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_NONE };
666 static const int input_srate[] = {48000, -1}; // ITU-R BS.1770 provides coeff only for 48kHz
667 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE };
669 /* set input audio formats */
670 formats = ff_make_format_list(sample_fmts);
672 return AVERROR(ENOMEM);
673 ff_formats_ref(formats, &inlink->out_formats);
675 layouts = ff_all_channel_layouts();
677 return AVERROR(ENOMEM);
678 ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
680 formats = ff_make_format_list(input_srate);
682 return AVERROR(ENOMEM);
683 ff_formats_ref(formats, &inlink->out_samplerates);
685 /* set optional output video format */
686 if (ebur128->do_video) {
687 formats = ff_make_format_list(pix_fmts);
689 return AVERROR(ENOMEM);
690 ff_formats_ref(formats, &outlink->in_formats);
691 outlink = ctx->outputs[1];
694 /* set audio output formats (same as input since it's just a passthrough) */
695 formats = ff_make_format_list(sample_fmts);
697 return AVERROR(ENOMEM);
698 ff_formats_ref(formats, &outlink->in_formats);
700 layouts = ff_all_channel_layouts();
702 return AVERROR(ENOMEM);
703 ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts);
705 formats = ff_make_format_list(input_srate);
707 return AVERROR(ENOMEM);
708 ff_formats_ref(formats, &outlink->in_samplerates);
713 static av_cold void uninit(AVFilterContext *ctx)
716 EBUR128Context *ebur128 = ctx->priv;
718 av_log(ctx, AV_LOG_INFO, "Summary:\n\n"
719 " Integrated loudness:\n"
721 " Threshold: %5.1f LUFS\n\n"
724 " Threshold: %5.1f LUFS\n"
725 " LRA low: %5.1f LUFS\n"
726 " LRA high: %5.1f LUFS\n",
727 ebur128->integrated_loudness, ebur128->i400.rel_threshold,
728 ebur128->loudness_range, ebur128->i3000.rel_threshold,
729 ebur128->lra_low, ebur128->lra_high);
731 av_freep(&ebur128->y_line_ref);
732 av_freep(&ebur128->ch_weighting);
733 av_freep(&ebur128->i400.histogram);
734 av_freep(&ebur128->i3000.histogram);
735 for (i = 0; i < ebur128->nb_channels; i++) {
736 av_freep(&ebur128->i400.cache[i]);
737 av_freep(&ebur128->i3000.cache[i]);
739 for (i = 0; i < ctx->nb_outputs; i++)
740 av_freep(&ctx->output_pads[i].name);
741 avfilter_unref_bufferp(&ebur128->outpicref);
744 static const AVFilterPad ebur128_inputs[] = {
747 .type = AVMEDIA_TYPE_AUDIO,
748 .get_audio_buffer = ff_null_get_audio_buffer,
749 .filter_frame = filter_frame,
754 AVFilter avfilter_af_ebur128 = {
756 .description = NULL_IF_CONFIG_SMALL("EBU R128 scanner."),
757 .priv_size = sizeof(EBUR128Context),
760 .query_formats = query_formats,
761 .inputs = ebur128_inputs,
763 .priv_class = &ebur128_class,