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FFmpeg/libavfilter/f_ebur128.c
Ganesh Ajjanagadde db1a642cd2 all: move ff_exp10, ff_exp10f, ff_fast_powf to lavu/ffmath.h 
The idea is to use ffmath.h for internal implementations of math functions.
Currently, it is used for variants of libm functions, but is by no means
limited to such things.

Note that this is not exported; use lavu/mathematics for such purposes.

Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanag@gmail.com>
2016-03-22 10:15:31 -07:00

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/*
* 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/ffmath.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
int dual_mono; ///< whether or not to treat single channel input files as dual-mono
double pan_law; ///< pan law value used to calulate dual-mono measurements
} 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_BOOL, {.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_BOOL, {.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" },
{ "dualmono", "treat mono input files as dual-mono", OFFSET(dual_mono), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, A|F },
{ "panlaw", "set a specific pan law for dual-mono files", OFFSET(pan_law), AV_OPT_TYPE_DOUBLE, {.dbl = -3.01029995663978}, -10.0, 0.0, A|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(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);
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;
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++) {
/* channel weighting */
const uint16_t chl = av_channel_layout_extract_channel(outlink->channel_layout, i);
if (chl & (AV_CH_LOW_FREQUENCY|AV_CH_LOW_FREQUENCY_2)) {
ebur128->ch_weighting[i] = 0;
} else if (chl & BACK_MASK) {
ebur128->ch_weighting[i] = 1.41;
} else {
ebur128->ch_weighting[i] = 1.0;
}
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);
}
#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) (ff_exp10(((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], fabs(*swr_samples));
ebur128->true_peaks_per_frame[ch] = FFMAX(ebur128->true_peaks_per_frame[ch],
fabs(*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], fabs(*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);
/* dual-mono correction */
if (nb_channels == 1 && ebur128->dual_mono) {
ebur128->integrated_loudness -= ebur128->pan_law;
}
}
}
/* 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;
}
}
/* dual-mono correction */
if (nb_channels == 1 && ebur128->dual_mono) {
loudness_400 -= ebur128->pan_law;
loudness_3000 -= ebur128->pan_law;
}
#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];
int ret;
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 ((ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)
return ret;
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 ((ret = ff_formats_ref(formats, &inlink->out_formats)) < 0 ||
(ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)
return ret;
layouts = ff_all_channel_layouts();
if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0 ||
(ret = ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts)) < 0)
return ret;
formats = ff_make_format_list(input_srate);
if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0 ||
(ret = ff_formats_ref(formats, &outlink->in_samplerates)) < 0)
return ret;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
int i;
EBUR128Context *ebur128 = ctx->priv;
/* dual-mono correction */
if (ebur128->nb_channels == 1 && ebur128->dual_mono) {
ebur128->i400.rel_threshold -= ebur128->pan_law;
ebur128->i3000.rel_threshold -= ebur128->pan_law;
ebur128->lra_low -= ebur128->pan_law;
ebur128->lra_high -= ebur128->pan_law;
}
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,
};
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