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libavfilter/ebur128: introduce target range

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This eases meeting the target level during live mixing.

Signed-off-by: Daniel Molkentin <daniel@molkentin.de>
Signed-off-by: Conrad Zelck <c.zelck@imail.de>
This commit is contained in:
Daniel Molkentin 2018-10-09 14:32:56 +02:00 committed by Paul B Mahol
parent d587390988
commit d445bcb137
2 changed files with 26 additions and 10 deletions
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3
doc/filters.texi
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@ -19284,6 +19284,9 @@ short-term loudness (3 seconds of analysis), and the gauge on the right is for
the momentary loudness (400 milliseconds), but can optionally be configured
to instead display short-term loudness (see @var{gauge}).
The green area marks a +/- 1LU target range around the target loudness
(-23LUFS by default, unless modified through @var{target}).
More information about the Loudness Recommendation EBU R128 on
@url{http://tech.ebu.ch/loudness}.

33
libavfilter/f_ebur128.c
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@ -114,6 +114,8 @@ typedef struct EBUR128Context {
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_opt_max; ///< the y value (pixel position) for 1 LU
int y_opt_min; ///< the y value (pixel position) for -1 LU
int *y_line_ref; ///< y reference values for drawing the LU lines in the graph and the gauge
/* audio */
@ -188,22 +190,31 @@ static const AVOption ebur128_options[] = {
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
0xdd, 0x66, 0x66, // value above 1LU non reached below -1LU (impossible)
0x66, 0x66, 0xdd, // value below 1LU non reached below -1LU
0x96, 0x33, 0x33, // value above 1LU reached below -1LU (impossible)
0x33, 0x33, 0x96, // value below 1LU reached below -1LU
0xdd, 0x96, 0x96, // value above 1LU line non reached below -1LU (impossible)
0x96, 0x96, 0xdd, // value below 1LU line non reached below -1LU
0xdd, 0x33, 0x33, // value above 1LU line reached below -1LU (impossible)
0x33, 0x33, 0xdd, // value below 1LU line reached below -1LU
0xdd, 0x66, 0x66, // value above 1LU non reached above -1LU
0x66, 0xdd, 0x66, // value below 1LU non reached above -1LU
0x96, 0x33, 0x33, // value above 1LU reached above -1LU
0x33, 0x96, 0x33, // value below 1LU reached above -1LU
0xdd, 0x96, 0x96, // value above 1LU line non reached above -1LU
0x96, 0xdd, 0x96, // value below 1LU line non reached above -1LU
0xdd, 0x33, 0x33, // value above 1LU line reached above -1LU
0x33, 0xdd, 0x33, // value below 1LU line reached above -1LU
};
static const uint8_t *get_graph_color(const EBUR128Context *ebur128, int v, int y)
{
const int below0 = y > ebur128->y_zero_lu;
const int above_opt_max = y > ebur128->y_opt_max;
const int below_opt_min = y < ebur128->y_opt_min;
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;
const int colorid = 8*below_opt_min+ 4*line + 2*reached + above_opt_max;
return graph_colors + 3*colorid;
}
@ -337,6 +348,8 @@ static int config_video_output(AVFilterLink *outlink)
/* draw graph */
ebur128->y_zero_lu = lu_to_y(ebur128, 0);
ebur128->y_opt_max = lu_to_y(ebur128, 1);
ebur128->y_opt_min = lu_to_y(ebur128, -1);
p = outpicref->data[0] + ebur128->graph.y * outpicref->linesize[0]
+ ebur128->graph.x * 3;
for (y = 0; y < ebur128->graph.h; y++) {