/* * Copyright (c) 2012 Clément Bœsch * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with FFmpeg; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ /** * @file * EBU R.128 implementation * @see http://tech.ebu.ch/loudness * @see https://www.youtube.com/watch?v=iuEtQqC-Sqo "EBU R128 Introduction - Florian Camerer" * @todo implement start/stop/reset through filter command injection * @todo support other frequencies to avoid resampling */ #include <math.h> #include "libavutil/avassert.h" #include "libavutil/avstring.h" #include "libavutil/channel_layout.h" #include "libavutil/dict.h" #include "libavutil/xga_font_data.h" #include "libavutil/opt.h" #include "libavutil/timestamp.h" #include "libswresample/swresample.h" #include "audio.h" #include "avfilter.h" #include "formats.h" #include "internal.h" #define MAX_CHANNELS 63 /* pre-filter coefficients */ #define PRE_B0 1.53512485958697 #define PRE_B1 -2.69169618940638 #define PRE_B2 1.19839281085285 #define PRE_A1 -1.69065929318241 #define PRE_A2 0.73248077421585 /* RLB-filter coefficients */ #define RLB_B0 1.0 #define RLB_B1 -2.0 #define RLB_B2 1.0 #define RLB_A1 -1.99004745483398 #define RLB_A2 0.99007225036621 #define ABS_THRES -70 ///< silence gate: we discard anything below this absolute (LUFS) threshold #define ABS_UP_THRES 10 ///< upper loud limit to consider (ABS_THRES being the minimum) #define HIST_GRAIN 100 ///< defines histogram precision #define HIST_SIZE ((ABS_UP_THRES - ABS_THRES) * HIST_GRAIN + 1) /** * A histogram is an array of HIST_SIZE hist_entry storing all the energies * recorded (with an accuracy of 1/HIST_GRAIN) of the loudnesses from ABS_THRES * (at 0) to ABS_UP_THRES (at HIST_SIZE-1). * This fixed-size system avoids the need of a list of energies growing * infinitely over the time and is thus more scalable. */ struct hist_entry { int count; ///< how many times the corresponding value occurred double energy; ///< E = 10^((L + 0.691) / 10) double loudness; ///< L = -0.691 + 10 * log10(E) }; struct integrator { double *cache[MAX_CHANNELS]; ///< window of filtered samples (N ms) int cache_pos; ///< focus on the last added bin in the cache array double sum[MAX_CHANNELS]; ///< sum of the last N ms filtered samples (cache content) int filled; ///< 1 if the cache is completely filled, 0 otherwise double rel_threshold; ///< relative threshold double sum_kept_powers; ///< sum of the powers (weighted sums) above absolute threshold int nb_kept_powers; ///< number of sum above absolute threshold struct hist_entry *histogram; ///< histogram of the powers, used to compute LRA and I }; struct rect { int x, y, w, h; }; typedef struct { const AVClass *class; ///< AVClass context for log and options purpose /* peak metering */ int peak_mode; ///< enabled peak modes double *true_peaks; ///< true peaks per channel double *sample_peaks; ///< sample peaks per channel double *true_peaks_per_frame; ///< true peaks in a frame per channel #if CONFIG_SWRESAMPLE SwrContext *swr_ctx; ///< over-sampling context for true peak metering double *swr_buf; ///< resampled audio data for true peak metering int swr_linesize; #endif /* video */ int do_video; ///< 1 if video output enabled, 0 otherwise int w, h; ///< size of the video output struct rect text; ///< rectangle for the LU legend on the left struct rect graph; ///< rectangle for the main graph in the center struct rect gauge; ///< rectangle for the gauge on the right AVFrame *outpicref; ///< output picture reference, updated regularly int meter; ///< select a EBU mode between +9 and +18 int scale_range; ///< the range of LU values according to the meter int y_zero_lu; ///< the y value (pixel position) for 0 LU int *y_line_ref; ///< y reference values for drawing the LU lines in the graph and the gauge /* audio */ int nb_channels; ///< number of channels in the input double *ch_weighting; ///< channel weighting mapping int sample_count; ///< sample count used for refresh frequency, reset at refresh /* Filter caches. * The mult by 3 in the following is for X[i], X[i-1] and X[i-2] */ double x[MAX_CHANNELS * 3]; ///< 3 input samples cache for each channel double y[MAX_CHANNELS * 3]; ///< 3 pre-filter samples cache for each channel double z[MAX_CHANNELS * 3]; ///< 3 RLB-filter samples cache for each channel #define I400_BINS (48000 * 4 / 10) #define I3000_BINS (48000 * 3) struct integrator i400; ///< 400ms integrator, used for Momentary loudness (M), and Integrated loudness (I) struct integrator i3000; ///< 3s integrator, used for Short term loudness (S), and Loudness Range (LRA) /* I and LRA specific */ double integrated_loudness; ///< integrated loudness in LUFS (I) double loudness_range; ///< loudness range in LU (LRA) double lra_low, lra_high; ///< low and high LRA values /* misc */ int loglevel; ///< log level for frame logging int metadata; ///< whether or not to inject loudness results in frames } EBUR128Context; enum { PEAK_MODE_NONE = 0, PEAK_MODE_SAMPLES_PEAKS = 1<<1, PEAK_MODE_TRUE_PEAKS = 1<<2, }; #define OFFSET(x) offsetof(EBUR128Context, x) #define A AV_OPT_FLAG_AUDIO_PARAM #define V AV_OPT_FLAG_VIDEO_PARAM #define F AV_OPT_FLAG_FILTERING_PARAM static const AVOption ebur128_options[] = { { "video", "set video output", OFFSET(do_video), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, V|F }, { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x480"}, 0, 0, V|F }, { "meter", "set scale meter (+9 to +18)", OFFSET(meter), AV_OPT_TYPE_INT, {.i64 = 9}, 9, 18, V|F }, { "framelog", "force frame logging level", OFFSET(loglevel), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, A|V|F, "level" }, { "info", "information logging level", 0, AV_OPT_TYPE_CONST, {.i64 = AV_LOG_INFO}, INT_MIN, INT_MAX, A|V|F, "level" }, { "verbose", "verbose logging level", 0, AV_OPT_TYPE_CONST, {.i64 = AV_LOG_VERBOSE}, INT_MIN, INT_MAX, A|V|F, "level" }, { "metadata", "inject metadata in the filtergraph", OFFSET(metadata), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, A|V|F }, { "peak", "set peak mode", OFFSET(peak_mode), AV_OPT_TYPE_FLAGS, {.i64 = PEAK_MODE_NONE}, 0, INT_MAX, A|F, "mode" }, { "none", "disable any peak mode", 0, AV_OPT_TYPE_CONST, {.i64 = PEAK_MODE_NONE}, INT_MIN, INT_MAX, A|F, "mode" }, { "sample", "enable peak-sample mode", 0, AV_OPT_TYPE_CONST, {.i64 = PEAK_MODE_SAMPLES_PEAKS}, INT_MIN, INT_MAX, A|F, "mode" }, { "true", "enable true-peak mode", 0, AV_OPT_TYPE_CONST, {.i64 = PEAK_MODE_TRUE_PEAKS}, INT_MIN, INT_MAX, A|F, "mode" }, { NULL }, }; AVFILTER_DEFINE_CLASS(ebur128); static const uint8_t graph_colors[] = { 0xdd, 0x66, 0x66, // value above 0LU non reached 0x66, 0x66, 0xdd, // value below 0LU non reached 0x96, 0x33, 0x33, // value above 0LU reached 0x33, 0x33, 0x96, // value below 0LU reached 0xdd, 0x96, 0x96, // value above 0LU line non reached 0x96, 0x96, 0xdd, // value below 0LU line non reached 0xdd, 0x33, 0x33, // value above 0LU line reached 0x33, 0x33, 0xdd, // value below 0LU line reached }; static const uint8_t *get_graph_color(const EBUR128Context *ebur128, int v, int y) { const int below0 = y > ebur128->y_zero_lu; const int reached = y >= v; const int line = ebur128->y_line_ref[y] || y == ebur128->y_zero_lu; const int colorid = 4*line + 2*reached + below0; return graph_colors + 3*colorid; } static inline int lu_to_y(const EBUR128Context *ebur128, double v) { v += 2 * ebur128->meter; // make it in range [0;...] v = av_clipf(v, 0, ebur128->scale_range); // make sure it's in the graph scale v = ebur128->scale_range - v; // invert value (y=0 is on top) return v * ebur128->graph.h / ebur128->scale_range; // rescale from scale range to px height } #define FONT8 0 #define FONT16 1 static const uint8_t font_colors[] = { 0xdd, 0xdd, 0x00, 0x00, 0x96, 0x96, }; static void drawtext(AVFrame *pic, int x, int y, int ftid, const uint8_t *color, const char *fmt, ...) { int i; char buf[128] = {0}; const uint8_t *font; int font_height; va_list vl; if (ftid == FONT16) font = avpriv_vga16_font, font_height = 16; else if (ftid == FONT8) font = avpriv_cga_font, font_height = 8; else return; va_start(vl, fmt); vsnprintf(buf, sizeof(buf), fmt, vl); va_end(vl); for (i = 0; buf[i]; i++) { int char_y, mask; uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8)*3; for (char_y = 0; char_y < font_height; char_y++) { for (mask = 0x80; mask; mask >>= 1) { if (font[buf[i] * font_height + char_y] & mask) memcpy(p, color, 3); else memcpy(p, "\x00\x00\x00", 3); p += 3; } p += pic->linesize[0] - 8*3; } } } static void drawline(AVFrame *pic, int x, int y, int len, int step) { int i; uint8_t *p = pic->data[0] + y*pic->linesize[0] + x*3; for (i = 0; i < len; i++) { memcpy(p, "\x00\xff\x00", 3); p += step; } } static int config_video_output(AVFilterLink *outlink) { int i, x, y; uint8_t *p; AVFilterContext *ctx = outlink->src; EBUR128Context *ebur128 = ctx->priv; AVFrame *outpicref; /* check if there is enough space to represent everything decently */ if (ebur128->w < 640 || ebur128->h < 480) { av_log(ctx, AV_LOG_ERROR, "Video size %dx%d is too small, " "minimum size is 640x480\n", ebur128->w, ebur128->h); return AVERROR(EINVAL); } outlink->w = ebur128->w; outlink->h = ebur128->h; #define PAD 8 /* configure text area position and size */ ebur128->text.x = PAD; ebur128->text.y = 40; ebur128->text.w = 3 * 8; // 3 characters ebur128->text.h = ebur128->h - PAD - ebur128->text.y; /* configure gauge position and size */ ebur128->gauge.w = 20; ebur128->gauge.h = ebur128->text.h; ebur128->gauge.x = ebur128->w - PAD - ebur128->gauge.w; ebur128->gauge.y = ebur128->text.y; /* configure graph position and size */ ebur128->graph.x = ebur128->text.x + ebur128->text.w + PAD; ebur128->graph.y = ebur128->gauge.y; ebur128->graph.w = ebur128->gauge.x - ebur128->graph.x - PAD; ebur128->graph.h = ebur128->gauge.h; /* graph and gauge share the LU-to-pixel code */ av_assert0(ebur128->graph.h == ebur128->gauge.h); /* prepare the initial picref buffer */ av_frame_free(&ebur128->outpicref); ebur128->outpicref = outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h); if (!outpicref) return AVERROR(ENOMEM); outlink->sample_aspect_ratio = (AVRational){1,1}; /* init y references values (to draw LU lines) */ ebur128->y_line_ref = av_calloc(ebur128->graph.h + 1, sizeof(*ebur128->y_line_ref)); if (!ebur128->y_line_ref) return AVERROR(ENOMEM); /* black background */ memset(outpicref->data[0], 0, ebur128->h * outpicref->linesize[0]); /* draw LU legends */ drawtext(outpicref, PAD, PAD+16, FONT8, font_colors+3, " LU"); for (i = ebur128->meter; i >= -ebur128->meter * 2; i--) { y = lu_to_y(ebur128, i); x = PAD + (i < 10 && i > -10) * 8; ebur128->y_line_ref[y] = i; y -= 4; // -4 to center vertically drawtext(outpicref, x, y + ebur128->graph.y, FONT8, font_colors+3, "%c%d", i < 0 ? '-' : i > 0 ? '+' : ' ', FFABS(i)); } /* draw graph */ ebur128->y_zero_lu = lu_to_y(ebur128, 0); p = outpicref->data[0] + ebur128->graph.y * outpicref->linesize[0] + ebur128->graph.x * 3; for (y = 0; y < ebur128->graph.h; y++) { const uint8_t *c = get_graph_color(ebur128, INT_MAX, y); for (x = 0; x < ebur128->graph.w; x++) memcpy(p + x*3, c, 3); p += outpicref->linesize[0]; } /* draw fancy rectangles around the graph and the gauge */ #define DRAW_RECT(r) do { \ drawline(outpicref, r.x, r.y - 1, r.w, 3); \ drawline(outpicref, r.x, r.y + r.h, r.w, 3); \ drawline(outpicref, r.x - 1, r.y, r.h, outpicref->linesize[0]); \ drawline(outpicref, r.x + r.w, r.y, r.h, outpicref->linesize[0]); \ } while (0) DRAW_RECT(ebur128->graph); DRAW_RECT(ebur128->gauge); outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; return 0; } static int config_audio_input(AVFilterLink *inlink) { AVFilterContext *ctx = inlink->dst; EBUR128Context *ebur128 = ctx->priv; /* Force 100ms framing in case of metadata injection: the frames must have * a granularity of the window overlap to be accurately exploited. * As for the true peaks mode, it just simplifies the resampling buffer * allocation and the lookup in it (since sample buffers differ in size, it * can be more complex to integrate in the one-sample loop of * filter_frame()). */ if (ebur128->metadata || (ebur128->peak_mode & PEAK_MODE_TRUE_PEAKS)) inlink->min_samples = inlink->max_samples = inlink->partial_buf_size = inlink->sample_rate / 10; return 0; } static int config_audio_output(AVFilterLink *outlink) { int i; int idx_bitposn = 0; AVFilterContext *ctx = outlink->src; EBUR128Context *ebur128 = ctx->priv; const int nb_channels = av_get_channel_layout_nb_channels(outlink->channel_layout); #define BACK_MASK (AV_CH_BACK_LEFT |AV_CH_BACK_CENTER |AV_CH_BACK_RIGHT| \ AV_CH_TOP_BACK_LEFT|AV_CH_TOP_BACK_CENTER|AV_CH_TOP_BACK_RIGHT| \ AV_CH_SIDE_LEFT |AV_CH_SIDE_RIGHT| \ AV_CH_SURROUND_DIRECT_LEFT |AV_CH_SURROUND_DIRECT_RIGHT) ebur128->nb_channels = nb_channels; ebur128->ch_weighting = av_calloc(nb_channels, sizeof(*ebur128->ch_weighting)); if (!ebur128->ch_weighting) return AVERROR(ENOMEM); for (i = 0; i < nb_channels; i++) { /* find the next bit that is set starting from the right */ while ((outlink->channel_layout & 1ULL<<idx_bitposn) == 0 && idx_bitposn < 63) idx_bitposn++; /* channel weighting */ if ((1ULL<<idx_bitposn & AV_CH_LOW_FREQUENCY) || (1ULL<<idx_bitposn & AV_CH_LOW_FREQUENCY_2)) { ebur128->ch_weighting[i] = 0; } else if (1ULL<<idx_bitposn & BACK_MASK) { ebur128->ch_weighting[i] = 1.41; } else { ebur128->ch_weighting[i] = 1.0; } idx_bitposn++; if (!ebur128->ch_weighting[i]) continue; /* bins buffer for the two integration window (400ms and 3s) */ ebur128->i400.cache[i] = av_calloc(I400_BINS, sizeof(*ebur128->i400.cache[0])); ebur128->i3000.cache[i] = av_calloc(I3000_BINS, sizeof(*ebur128->i3000.cache[0])); if (!ebur128->i400.cache[i] || !ebur128->i3000.cache[i]) return AVERROR(ENOMEM); } outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; #if CONFIG_SWRESAMPLE if (ebur128->peak_mode & PEAK_MODE_TRUE_PEAKS) { int ret; ebur128->swr_buf = av_malloc_array(nb_channels, 19200 * sizeof(double)); ebur128->true_peaks = av_calloc(nb_channels, sizeof(*ebur128->true_peaks)); ebur128->true_peaks_per_frame = av_calloc(nb_channels, sizeof(*ebur128->true_peaks_per_frame)); ebur128->swr_ctx = swr_alloc(); if (!ebur128->swr_buf || !ebur128->true_peaks || !ebur128->true_peaks_per_frame || !ebur128->swr_ctx) return AVERROR(ENOMEM); av_opt_set_int(ebur128->swr_ctx, "in_channel_layout", outlink->channel_layout, 0); av_opt_set_int(ebur128->swr_ctx, "in_sample_rate", outlink->sample_rate, 0); av_opt_set_sample_fmt(ebur128->swr_ctx, "in_sample_fmt", outlink->format, 0); av_opt_set_int(ebur128->swr_ctx, "out_channel_layout", outlink->channel_layout, 0); av_opt_set_int(ebur128->swr_ctx, "out_sample_rate", 192000, 0); av_opt_set_sample_fmt(ebur128->swr_ctx, "out_sample_fmt", outlink->format, 0); ret = swr_init(ebur128->swr_ctx); if (ret < 0) return ret; } #endif if (ebur128->peak_mode & PEAK_MODE_SAMPLES_PEAKS) { ebur128->sample_peaks = av_calloc(nb_channels, sizeof(*ebur128->sample_peaks)); if (!ebur128->sample_peaks) return AVERROR(ENOMEM); } return 0; } #define ENERGY(loudness) (pow(10, ((loudness) + 0.691) / 10.)) #define LOUDNESS(energy) (-0.691 + 10 * log10(energy)) #define DBFS(energy) (20 * log10(energy)) static struct hist_entry *get_histogram(void) { int i; struct hist_entry *h = av_calloc(HIST_SIZE, sizeof(*h)); if (!h) return NULL; for (i = 0; i < HIST_SIZE; i++) { h[i].loudness = i / (double)HIST_GRAIN + ABS_THRES; h[i].energy = ENERGY(h[i].loudness); } return h; } static av_cold int init(AVFilterContext *ctx) { EBUR128Context *ebur128 = ctx->priv; AVFilterPad pad; if (ebur128->loglevel != AV_LOG_INFO && ebur128->loglevel != AV_LOG_VERBOSE) { if (ebur128->do_video || ebur128->metadata) ebur128->loglevel = AV_LOG_VERBOSE; else ebur128->loglevel = AV_LOG_INFO; } if (!CONFIG_SWRESAMPLE && (ebur128->peak_mode & PEAK_MODE_TRUE_PEAKS)) { av_log(ctx, AV_LOG_ERROR, "True-peak mode requires libswresample to be performed\n"); return AVERROR(EINVAL); } // if meter is +9 scale, scale range is from -18 LU to +9 LU (or 3*9) // if meter is +18 scale, scale range is from -36 LU to +18 LU (or 3*18) ebur128->scale_range = 3 * ebur128->meter; ebur128->i400.histogram = get_histogram(); ebur128->i3000.histogram = get_histogram(); if (!ebur128->i400.histogram || !ebur128->i3000.histogram) return AVERROR(ENOMEM); ebur128->integrated_loudness = ABS_THRES; ebur128->loudness_range = 0; /* insert output pads */ if (ebur128->do_video) { pad = (AVFilterPad){ .name = av_strdup("out0"), .type = AVMEDIA_TYPE_VIDEO, .config_props = config_video_output, }; if (!pad.name) return AVERROR(ENOMEM); ff_insert_outpad(ctx, 0, &pad); } pad = (AVFilterPad){ .name = av_asprintf("out%d", ebur128->do_video), .type = AVMEDIA_TYPE_AUDIO, .config_props = config_audio_output, }; if (!pad.name) return AVERROR(ENOMEM); ff_insert_outpad(ctx, ebur128->do_video, &pad); /* summary */ av_log(ctx, AV_LOG_VERBOSE, "EBU +%d scale\n", ebur128->meter); return 0; } #define HIST_POS(power) (int)(((power) - ABS_THRES) * HIST_GRAIN) /* loudness and power should be set such as loudness = -0.691 + * 10*log10(power), we just avoid doing that calculus two times */ static int gate_update(struct integrator *integ, double power, double loudness, int gate_thres) { int ipower; double relative_threshold; int gate_hist_pos; /* update powers histograms by incrementing current power count */ ipower = av_clip(HIST_POS(loudness), 0, HIST_SIZE - 1); integ->histogram[ipower].count++; /* compute relative threshold and get its position in the histogram */ integ->sum_kept_powers += power; integ->nb_kept_powers++; relative_threshold = integ->sum_kept_powers / integ->nb_kept_powers; if (!relative_threshold) relative_threshold = 1e-12; integ->rel_threshold = LOUDNESS(relative_threshold) + gate_thres; gate_hist_pos = av_clip(HIST_POS(integ->rel_threshold), 0, HIST_SIZE - 1); return gate_hist_pos; } static int filter_frame(AVFilterLink *inlink, AVFrame *insamples) { int i, ch, idx_insample; AVFilterContext *ctx = inlink->dst; EBUR128Context *ebur128 = ctx->priv; const int nb_channels = ebur128->nb_channels; const int nb_samples = insamples->nb_samples; const double *samples = (double *)insamples->data[0]; AVFrame *pic = ebur128->outpicref; #if CONFIG_SWRESAMPLE if (ebur128->peak_mode & PEAK_MODE_TRUE_PEAKS) { const double *swr_samples = ebur128->swr_buf; int ret = swr_convert(ebur128->swr_ctx, (uint8_t**)&ebur128->swr_buf, 19200, (const uint8_t **)insamples->data, nb_samples); if (ret < 0) return ret; for (ch = 0; ch < nb_channels; ch++) ebur128->true_peaks_per_frame[ch] = 0.0; for (idx_insample = 0; idx_insample < ret; idx_insample++) { for (ch = 0; ch < nb_channels; ch++) { ebur128->true_peaks[ch] = FFMAX(ebur128->true_peaks[ch], FFABS(*swr_samples)); ebur128->true_peaks_per_frame[ch] = FFMAX(ebur128->true_peaks_per_frame[ch], FFABS(*swr_samples)); swr_samples++; } } } #endif for (idx_insample = 0; idx_insample < nb_samples; idx_insample++) { const int bin_id_400 = ebur128->i400.cache_pos; const int bin_id_3000 = ebur128->i3000.cache_pos; #define MOVE_TO_NEXT_CACHED_ENTRY(time) do { \ ebur128->i##time.cache_pos++; \ if (ebur128->i##time.cache_pos == I##time##_BINS) { \ ebur128->i##time.filled = 1; \ ebur128->i##time.cache_pos = 0; \ } \ } while (0) MOVE_TO_NEXT_CACHED_ENTRY(400); MOVE_TO_NEXT_CACHED_ENTRY(3000); for (ch = 0; ch < nb_channels; ch++) { double bin; if (ebur128->peak_mode & PEAK_MODE_SAMPLES_PEAKS) ebur128->sample_peaks[ch] = FFMAX(ebur128->sample_peaks[ch], FFABS(*samples)); ebur128->x[ch * 3] = *samples++; // set X[i] if (!ebur128->ch_weighting[ch]) continue; /* Y[i] = X[i]*b0 + X[i-1]*b1 + X[i-2]*b2 - Y[i-1]*a1 - Y[i-2]*a2 */ #define FILTER(Y, X, name) do { \ double *dst = ebur128->Y + ch*3; \ double *src = ebur128->X + ch*3; \ dst[2] = dst[1]; \ dst[1] = dst[0]; \ dst[0] = src[0]*name##_B0 + src[1]*name##_B1 + src[2]*name##_B2 \ - dst[1]*name##_A1 - dst[2]*name##_A2; \ } while (0) // TODO: merge both filters in one? FILTER(y, x, PRE); // apply pre-filter ebur128->x[ch * 3 + 2] = ebur128->x[ch * 3 + 1]; ebur128->x[ch * 3 + 1] = ebur128->x[ch * 3 ]; FILTER(z, y, RLB); // apply RLB-filter bin = ebur128->z[ch * 3] * ebur128->z[ch * 3]; /* add the new value, and limit the sum to the cache size (400ms or 3s) * by removing the oldest one */ ebur128->i400.sum [ch] = ebur128->i400.sum [ch] + bin - ebur128->i400.cache [ch][bin_id_400]; ebur128->i3000.sum[ch] = ebur128->i3000.sum[ch] + bin - ebur128->i3000.cache[ch][bin_id_3000]; /* override old cache entry with the new value */ ebur128->i400.cache [ch][bin_id_400 ] = bin; ebur128->i3000.cache[ch][bin_id_3000] = bin; } /* For integrated loudness, gating blocks are 400ms long with 75% * overlap (see BS.1770-2 p5), so a re-computation is needed each 100ms * (4800 samples at 48kHz). */ if (++ebur128->sample_count == 4800) { double loudness_400, loudness_3000; double power_400 = 1e-12, power_3000 = 1e-12; AVFilterLink *outlink = ctx->outputs[0]; const int64_t pts = insamples->pts + av_rescale_q(idx_insample, (AVRational){ 1, inlink->sample_rate }, outlink->time_base); ebur128->sample_count = 0; #define COMPUTE_LOUDNESS(m, time) do { \ if (ebur128->i##time.filled) { \ /* weighting sum of the last <time> ms */ \ for (ch = 0; ch < nb_channels; ch++) \ power_##time += ebur128->ch_weighting[ch] * ebur128->i##time.sum[ch]; \ power_##time /= I##time##_BINS; \ } \ loudness_##time = LOUDNESS(power_##time); \ } while (0) COMPUTE_LOUDNESS(M, 400); COMPUTE_LOUDNESS(S, 3000); /* Integrated loudness */ #define I_GATE_THRES -10 // initially defined to -8 LU in the first EBU standard if (loudness_400 >= ABS_THRES) { double integrated_sum = 0; int nb_integrated = 0; int gate_hist_pos = gate_update(&ebur128->i400, power_400, loudness_400, I_GATE_THRES); /* compute integrated loudness by summing the histogram values * above the relative threshold */ for (i = gate_hist_pos; i < HIST_SIZE; i++) { const int nb_v = ebur128->i400.histogram[i].count; nb_integrated += nb_v; integrated_sum += nb_v * ebur128->i400.histogram[i].energy; } if (nb_integrated) ebur128->integrated_loudness = LOUDNESS(integrated_sum / nb_integrated); } /* LRA */ #define LRA_GATE_THRES -20 #define LRA_LOWER_PRC 10 #define LRA_HIGHER_PRC 95 /* XXX: example code in EBU 3342 is ">=" but formula in BS.1770 * specs is ">" */ if (loudness_3000 >= ABS_THRES) { int nb_powers = 0; int gate_hist_pos = gate_update(&ebur128->i3000, power_3000, loudness_3000, LRA_GATE_THRES); for (i = gate_hist_pos; i < HIST_SIZE; i++) nb_powers += ebur128->i3000.histogram[i].count; if (nb_powers) { int n, nb_pow; /* get lower loudness to consider */ n = 0; nb_pow = LRA_LOWER_PRC * nb_powers / 100. + 0.5; for (i = gate_hist_pos; i < HIST_SIZE; i++) { n += ebur128->i3000.histogram[i].count; if (n >= nb_pow) { ebur128->lra_low = ebur128->i3000.histogram[i].loudness; break; } } /* get higher loudness to consider */ n = nb_powers; nb_pow = LRA_HIGHER_PRC * nb_powers / 100. + 0.5; for (i = HIST_SIZE - 1; i >= 0; i--) { n -= ebur128->i3000.histogram[i].count; if (n < nb_pow) { ebur128->lra_high = ebur128->i3000.histogram[i].loudness; break; } } // XXX: show low & high on the graph? ebur128->loudness_range = ebur128->lra_high - ebur128->lra_low; } } #define LOG_FMT "M:%6.1f S:%6.1f I:%6.1f LUFS LRA:%6.1f LU" /* push one video frame */ if (ebur128->do_video) { int x, y, ret; uint8_t *p; const int y_loudness_lu_graph = lu_to_y(ebur128, loudness_3000 + 23); const int y_loudness_lu_gauge = lu_to_y(ebur128, loudness_400 + 23); /* draw the graph using the short-term loudness */ p = pic->data[0] + ebur128->graph.y*pic->linesize[0] + ebur128->graph.x*3; for (y = 0; y < ebur128->graph.h; y++) { const uint8_t *c = get_graph_color(ebur128, y_loudness_lu_graph, y); memmove(p, p + 3, (ebur128->graph.w - 1) * 3); memcpy(p + (ebur128->graph.w - 1) * 3, c, 3); p += pic->linesize[0]; } /* draw the gauge using the momentary loudness */ p = pic->data[0] + ebur128->gauge.y*pic->linesize[0] + ebur128->gauge.x*3; for (y = 0; y < ebur128->gauge.h; y++) { const uint8_t *c = get_graph_color(ebur128, y_loudness_lu_gauge, y); for (x = 0; x < ebur128->gauge.w; x++) memcpy(p + x*3, c, 3); p += pic->linesize[0]; } /* draw textual info */ drawtext(pic, PAD, PAD - PAD/2, FONT16, font_colors, LOG_FMT " ", // padding to erase trailing characters loudness_400, loudness_3000, ebur128->integrated_loudness, ebur128->loudness_range); /* set pts and push frame */ pic->pts = pts; ret = ff_filter_frame(outlink, av_frame_clone(pic)); if (ret < 0) return ret; } if (ebur128->metadata) { /* happens only once per filter_frame call */ char metabuf[128]; #define META_PREFIX "lavfi.r128." #define SET_META(name, var) do { \ snprintf(metabuf, sizeof(metabuf), "%.3f", var); \ av_dict_set(&insamples->metadata, name, metabuf, 0); \ } while (0) #define SET_META_PEAK(name, ptype) do { \ if (ebur128->peak_mode & PEAK_MODE_ ## ptype ## _PEAKS) { \ char key[64]; \ for (ch = 0; ch < nb_channels; ch++) { \ snprintf(key, sizeof(key), \ META_PREFIX AV_STRINGIFY(name) "_peaks_ch%d", ch); \ SET_META(key, ebur128->name##_peaks[ch]); \ } \ } \ } while (0) SET_META(META_PREFIX "M", loudness_400); SET_META(META_PREFIX "S", loudness_3000); SET_META(META_PREFIX "I", ebur128->integrated_loudness); SET_META(META_PREFIX "LRA", ebur128->loudness_range); SET_META(META_PREFIX "LRA.low", ebur128->lra_low); SET_META(META_PREFIX "LRA.high", ebur128->lra_high); SET_META_PEAK(sample, SAMPLES); SET_META_PEAK(true, TRUE); } av_log(ctx, ebur128->loglevel, "t: %-10s " LOG_FMT, av_ts2timestr(pts, &outlink->time_base), loudness_400, loudness_3000, ebur128->integrated_loudness, ebur128->loudness_range); #define PRINT_PEAKS(str, sp, ptype) do { \ if (ebur128->peak_mode & PEAK_MODE_ ## ptype ## _PEAKS) { \ av_log(ctx, ebur128->loglevel, " " str ":"); \ for (ch = 0; ch < nb_channels; ch++) \ av_log(ctx, ebur128->loglevel, " %5.1f", DBFS(sp[ch])); \ av_log(ctx, ebur128->loglevel, " dBFS"); \ } \ } while (0) PRINT_PEAKS("SPK", ebur128->sample_peaks, SAMPLES); PRINT_PEAKS("FTPK", ebur128->true_peaks_per_frame, TRUE); PRINT_PEAKS("TPK", ebur128->true_peaks, TRUE); av_log(ctx, ebur128->loglevel, "\n"); } } return ff_filter_frame(ctx->outputs[ebur128->do_video], insamples); } static int query_formats(AVFilterContext *ctx) { EBUR128Context *ebur128 = ctx->priv; AVFilterFormats *formats; AVFilterChannelLayouts *layouts; AVFilterLink *inlink = ctx->inputs[0]; AVFilterLink *outlink = ctx->outputs[0]; static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_NONE }; static const int input_srate[] = {48000, -1}; // ITU-R BS.1770 provides coeff only for 48kHz static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE }; /* set optional output video format */ if (ebur128->do_video) { formats = ff_make_format_list(pix_fmts); if (!formats) return AVERROR(ENOMEM); ff_formats_ref(formats, &outlink->in_formats); outlink = ctx->outputs[1]; } /* set input and output audio formats * Note: ff_set_common_* functions are not used because they affect all the * links, and thus break the video format negotiation */ formats = ff_make_format_list(sample_fmts); if (!formats) return AVERROR(ENOMEM); ff_formats_ref(formats, &inlink->out_formats); ff_formats_ref(formats, &outlink->in_formats); layouts = ff_all_channel_layouts(); if (!layouts) return AVERROR(ENOMEM); ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts); ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts); formats = ff_make_format_list(input_srate); if (!formats) return AVERROR(ENOMEM); ff_formats_ref(formats, &inlink->out_samplerates); ff_formats_ref(formats, &outlink->in_samplerates); return 0; } static av_cold void uninit(AVFilterContext *ctx) { int i; EBUR128Context *ebur128 = ctx->priv; av_log(ctx, AV_LOG_INFO, "Summary:\n\n" " Integrated loudness:\n" " I: %5.1f LUFS\n" " Threshold: %5.1f LUFS\n\n" " Loudness range:\n" " LRA: %5.1f LU\n" " Threshold: %5.1f LUFS\n" " LRA low: %5.1f LUFS\n" " LRA high: %5.1f LUFS", ebur128->integrated_loudness, ebur128->i400.rel_threshold, ebur128->loudness_range, ebur128->i3000.rel_threshold, ebur128->lra_low, ebur128->lra_high); #define PRINT_PEAK_SUMMARY(str, sp, ptype) do { \ int ch; \ double maxpeak; \ maxpeak = 0.0; \ if (ebur128->peak_mode & PEAK_MODE_ ## ptype ## _PEAKS) { \ for (ch = 0; ch < ebur128->nb_channels; ch++) \ maxpeak = FFMAX(maxpeak, sp[ch]); \ av_log(ctx, AV_LOG_INFO, "\n\n " str " peak:\n" \ " Peak: %5.1f dBFS", \ DBFS(maxpeak)); \ } \ } while (0) PRINT_PEAK_SUMMARY("Sample", ebur128->sample_peaks, SAMPLES); PRINT_PEAK_SUMMARY("True", ebur128->true_peaks, TRUE); av_log(ctx, AV_LOG_INFO, "\n"); av_freep(&ebur128->y_line_ref); av_freep(&ebur128->ch_weighting); av_freep(&ebur128->true_peaks); av_freep(&ebur128->sample_peaks); av_freep(&ebur128->true_peaks_per_frame); av_freep(&ebur128->i400.histogram); av_freep(&ebur128->i3000.histogram); for (i = 0; i < ebur128->nb_channels; i++) { av_freep(&ebur128->i400.cache[i]); av_freep(&ebur128->i3000.cache[i]); } for (i = 0; i < ctx->nb_outputs; i++) av_freep(&ctx->output_pads[i].name); av_frame_free(&ebur128->outpicref); #if CONFIG_SWRESAMPLE av_freep(&ebur128->swr_buf); swr_free(&ebur128->swr_ctx); #endif } static const AVFilterPad ebur128_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_AUDIO, .filter_frame = filter_frame, .config_props = config_audio_input, }, { NULL } }; AVFilter ff_af_ebur128 = { .name = "ebur128", .description = NULL_IF_CONFIG_SMALL("EBU R128 scanner."), .priv_size = sizeof(EBUR128Context), .init = init, .uninit = uninit, .query_formats = query_formats, .inputs = ebur128_inputs, .outputs = NULL, .priv_class = &ebur128_class, .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS, };