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libavfilter/ebur128: add target level option for EBUR128 visualization filter

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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 14:32:53 +02:00 committed by Paul B Mahol
parent f85fa100db
commit d95c5b003c
2 changed files with 10 additions and 2 deletions
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6
doc/filters.texi
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@ -19358,6 +19358,12 @@ Multi-channel input files are not affected by this option.
@item panlaw
Set a specific pan law to be used for the measurement of dual mono files.
This parameter is optional, and has a default value of -3.01dB.
@item target
Set a specific target level (in LUFS) used as relative zero in the visualization.
This parameter is optional and has a default value of -23LUFS as specified
by EBU R128. However, material published online may prefer a level of -16LUFS
(e.g. for use with podcasts or video platforms).
@end table
@subsection Examples

6
libavfilter/f_ebur128.c
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@ -142,6 +142,7 @@ typedef struct EBUR128Context {
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 calculate dual-mono measurements
int target; ///< target level in LUFS used to set relative zero LU in visualization
} EBUR128Context;
enum {
@ -168,6 +169,7 @@ static const AVOption ebur128_options[] = {
{ "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 },
{ "target", "set a specific target level in LUFS (-23 to 0)", OFFSET(target), AV_OPT_TYPE_INT, {.i64 = -23}, -23, 0, V|F },
{ NULL },
};
@ -740,8 +742,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
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);
const int y_loudness_lu_graph = lu_to_y(ebur128, loudness_3000 - ebur128->target);
const int y_loudness_lu_gauge = lu_to_y(ebur128, loudness_400 - ebur128->target);
/* draw the graph using the short-term loudness */
p = pic->data[0] + ebur128->graph.y*pic->linesize[0] + ebur128->graph.x*3;