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lavfi: EBU R.128 scanner.

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This commit is contained in:
Clément Bœsch 2012-08-18 03:26:07 +02:00
parent 81bbce9cf3
commit d771b1d137
7 changed files with 799 additions and 1 deletions
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1
Changelog
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@ -3,6 +3,7 @@ releases are sorted from youngest to oldest.
version next:
- stream disposition information printing in ffprobe
- filter for loudness analysis following EBU R128
version 1.0:

1
configure vendored
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@ -1901,6 +1901,7 @@ decimate_filter_deps="gpl avcodec"
delogo_filter_deps="gpl"
deshake_filter_deps="avcodec"
drawtext_filter_deps="libfreetype"
ebur128_filter_deps="gpl"
flite_filter_deps="libflite"
frei0r_filter_deps="frei0r dlopen"
frei0r_filter_extralibs='$ldl'

47
doc/filters.texi
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@ -4480,6 +4480,53 @@ setpts=PTS+10/TB
@end example
@end itemize
@section ebur128
EBU R128 scanner filter. This filter takes an audio stream as input and outputs
it unchanged. By default, it logs a message at a frequency of 10Hz with the
Momentary loudness (identified by @code{M}), Short-term loudness (@code{S}),
Integrated loudness (@code{I}) and Loudness Range (@code{LRA}).
The filter also has a video output (see the @var{video} option) with a real
time graph to observe the loudness evolution. The graphic contains the logged
message mentioned above, so it is not printed anymore when this option is set,
unless the verbose logging is set. The main graphing area contains the
short-term loudness (3 seconds of analysis), and the gauge on the right is for
the momentary loudness (400 milliseconds).
More information about the Loudness Recommendation EBU R128 on
@url{http://tech.ebu.ch/loudness}.
The filter accepts the following named parameters:
@table @option
@item video
Activate the video output. The audio stream is passed unchanged whether this
option is set or no. The video stream will be the first output stream if
activated. Default is @code{0}.
@item size
Set the video size. This option is for video only. Default and minimum
resolution is @code{640x480}.
@item meter
Set the EBU scale meter. Default is @code{9}. Common values are @code{9} and
@code{18}, respectively for EBU scale meter +9 and EBU scale meter +18. Any
other integer value between this range is allowed.
@end table
Example of real-time graph using @command{ffplay}, with a EBU scale meter +18:
@example
ffplay -f lavfi -i "amovie=input.mp3,ebur128=video=1:meter=18 [out0][out1]"
@end example
Run an analysis with @command{ffmpeg}:
@example
ffmpeg -nostats -i input.mp3 -filter_complex ebur128 -f null -
@end example
@section settb, asettb
Set the timebase to use for the output frames timestamps.

1
libavfilter/Makefile
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@ -66,6 +66,7 @@ OBJS-$(CONFIG_ATEMPO_FILTER) += af_atempo.o
OBJS-$(CONFIG_CHANNELMAP_FILTER) += af_channelmap.o
OBJS-$(CONFIG_CHANNELSPLIT_FILTER) += af_channelsplit.o
OBJS-$(CONFIG_EARWAX_FILTER) += af_earwax.o
OBJS-$(CONFIG_EBUR128_FILTER) += f_ebur128.o
OBJS-$(CONFIG_JOIN_FILTER) += af_join.o
OBJS-$(CONFIG_PAN_FILTER) += af_pan.o
OBJS-$(CONFIG_RESAMPLE_FILTER) += af_resample.o

1
libavfilter/allfilters.c
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@ -58,6 +58,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (CHANNELMAP, channelmap, af);
REGISTER_FILTER (CHANNELSPLIT,channelsplit,af);
REGISTER_FILTER (EARWAX, earwax, af);
REGISTER_FILTER (EBUR128, ebur128, af);
REGISTER_FILTER (JOIN, join, af);
REGISTER_FILTER (PAN, pan, af);
REGISTER_FILTER (SILENCEDETECT, silencedetect, af);

747
libavfilter/f_ebur128.c Normal file
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@ -0,0 +1,747 @@
/*
* 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 True Peak
* @todo implement start/stop/reset through filter command injection
* @todo support other frequencies to avoid resampling
*/
#include <math.h>
#include "libavutil/audioconvert.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/xga_font_data.h"
#include "libavutil/opt.h"
#include "libavutil/timestamp.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)
/**
* An 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
/* 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
AVFilterBufferRef *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
} EBUR128Context;
#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 },
{ 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(AVFilterBufferRef *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(AVFilterBufferRef *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;
AVFilterBufferRef *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 */
avfilter_unref_bufferp(&ebur128->outpicref);
ebur128->outpicref = outpicref =
ff_get_video_buffer(outlink, AV_PERM_WRITE|AV_PERM_PRESERVE|AV_PERM_REUSE2,
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);
return 0;
}
static int config_audio_output(AVFilterLink *outlink)
{
int i;
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)
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++) {
/* channel weighting */
if ((outlink->channel_layout & 1ULL<<i) == AV_CH_LOW_FREQUENCY)
continue;
if (outlink->channel_layout & 1ULL<<i & BACK_MASK)
ebur128->ch_weighting[i] = 1.41;
else
ebur128->ch_weighting[i] = 1.0;
/* 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);
}
return 0;
}
#define ENERGY(loudness) (pow(10, ((loudness) + 0.691) / 10.))
#define LOUDNESS(energy) (-0.691 + 10 * log10(energy))
static struct hist_entry *get_histogram(void)
{
int i;
struct hist_entry *h = av_calloc(HIST_SIZE, sizeof(*h));
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, const char *args)
{
int ret;
EBUR128Context *ebur128 = ctx->priv;
AVFilterPad pad;
ebur128->class = &ebur128_class;
av_opt_set_defaults(ebur128);
if ((ret = av_set_options_string(ebur128, args, "=", ":")) < 0)
return ret;
// 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();
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_samples(AVFilterLink *inlink, AVFilterBufferRef *insamples)
{
int i, ch;
AVFilterContext *ctx = inlink->dst;
EBUR128Context *ebur128 = ctx->priv;
const int nb_channels = ebur128->nb_channels;
const int nb_samples = insamples->audio->nb_samples;
const double *samples = (double *)insamples->data[0];
AVFilterBufferRef *pic = ebur128->outpicref;
for (i = 0; i < nb_samples; i++) {
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->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)
ebur128->x[ch * 3] = *samples++; // set X[i]
// 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(i, (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;
if ((ret = ff_start_frame(outlink, avfilter_ref_buffer(pic, ~AV_PERM_WRITE)) < 0) < 0 ||
(ret = ff_draw_slice(outlink, 0, outlink->h, 1)) < 0 ||
(ret = ff_end_frame(outlink)) < 0)
return ret;
}
av_log(ctx, ebur128->do_video ? AV_LOG_VERBOSE : AV_LOG_INFO,
"t: %-10s " LOG_FMT "\n", av_ts2timestr(pts, &outlink->time_base),
loudness_400, loudness_3000,
ebur128->integrated_loudness, ebur128->loudness_range);
}
}
return ff_filter_samples(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, -1 };
static const int input_srate[] = {48000, -1}; // ITU-R BS.1770 provides coeff only for 48kHz
static const enum PixelFormat pix_fmts[] = { PIX_FMT_RGB24, -1 };
/* set input audio formats */
formats = ff_make_format_list(sample_fmts);
if (!formats)
return AVERROR(ENOMEM);
ff_formats_ref(formats, &inlink->out_formats);
layouts = ff_all_channel_layouts();
if (!layouts)
return AVERROR(ENOMEM);
ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
formats = ff_make_format_list(input_srate);
if (!formats)
return AVERROR(ENOMEM);
ff_formats_ref(formats, &inlink->out_samplerates);
/* 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 audio output formats (same as input since it's just a passthrough) */
formats = ff_make_format_list(sample_fmts);
if (!formats)
return AVERROR(ENOMEM);
ff_formats_ref(formats, &outlink->in_formats);
layouts = ff_all_channel_layouts();
if (!layouts)
return AVERROR(ENOMEM);
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, &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\n",
ebur128->integrated_loudness, ebur128->i400.rel_threshold,
ebur128->loudness_range, ebur128->i3000.rel_threshold,
ebur128->lra_low, ebur128->lra_high);
av_freep(&ebur128->y_line_ref);
av_freep(&ebur128->ch_weighting);
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);
avfilter_unref_bufferp(&ebur128->outpicref);
}
AVFilter avfilter_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 = (const AVFilterPad[]) {
{ .name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.get_audio_buffer = ff_null_get_audio_buffer,
.filter_samples = filter_samples, },
{ .name = NULL }
},
.outputs = NULL,
};

2
libavfilter/version.h
View File

@ -29,7 +29,7 @@
#include "libavutil/avutil.h"
#define LIBAVFILTER_VERSION_MAJOR 3
#define LIBAVFILTER_VERSION_MINOR 18
#define LIBAVFILTER_VERSION_MINOR 19
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \