Signed-off-by: Daniel Molkentin <[email protected]>
Signed-off-by: Conrad Zelck <[email protected]>
---
doc/filters.texi | 6 ++++++
libavfilter/f_ebur128.c | 6 ++++--
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index b523877cf3..86ea25bda8 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -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
diff --git a/libavfilter/f_ebur128.c b/libavfilter/f_ebur128.c
index a48d3629ce..dfccbff5ec 100644
--- a/libavfilter/f_ebur128.c
+++ b/libavfilter/f_ebur128.c
@@ -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;
--
2.17.1
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