to be specified in order to use this mode.
Options are true or false. Default is true.
+@item dual_mono
+Treat mono input files as "dual-mono". If a mono file is intended for playback
+on a stereo system, its EBU R128 measurement will be perceptually incorrect.
+If set to @code{true}, this option will compensate for this effect.
+Multi-channel input files are not affected by this option.
+Options are true or false. Default is false.
+
@item print_format
Set print format for stats. Options are summary, json, or none.
Default value is none.
double measured_thresh;
double offset;
int linear;
+ int dual_mono;
enum PrintFormat print_format;
double *buf;
{ "measured_thresh", "measured threshold of input file", OFFSET(measured_thresh), AV_OPT_TYPE_DOUBLE, {.dbl = -70.}, -99., 0., FLAGS },
{ "offset", "set offset gain", OFFSET(offset), AV_OPT_TYPE_DOUBLE, {.dbl = 0.}, -99., 99., FLAGS },
{ "linear", "normalize linearly if possible", OFFSET(linear), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
+ { "dual_mono", "treat mono input as dual-mono", OFFSET(dual_mono), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
{ "print_format", "set print format for stats", OFFSET(print_format), AV_OPT_TYPE_INT, {.i64 = NONE}, NONE, PF_NB -1, FLAGS, "print_format" },
{ "none", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NONE}, 0, 0, FLAGS, "print_format" },
{ "json", 0, 0, AV_OPT_TYPE_CONST, {.i64 = JSON}, 0, 0, FLAGS, "print_format" },
if (!s->r128_out)
return AVERROR(ENOMEM);
+ if (inlink->channels == 1 && s->dual_mono) {
+ ebur128_set_channel(s->r128_in, 0, EBUR128_DUAL_MONO);
+ ebur128_set_channel(s->r128_out, 0, EBUR128_DUAL_MONO);
+ }
+
s->buf_size = frame_size(inlink->sample_rate, 3000) * inlink->channels;
s->buf = av_malloc_array(s->buf_size, sizeof(*s->buf));
if (!s->buf)