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avfilter/af_sofalizer: make lfe gain user configurable

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Default settings have it too low.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2017-05-18 23:13:52 +02:00
parent 79bf4d1450
commit f5e5c53117
2 changed files with 6 additions and 1 deletions
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3
doc/filters.texi
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@ -3606,6 +3606,9 @@ Each virtual loudspeaker description is separated by '|'.
For example to override front left and front right channel positions use:
'speakers=FL 45 15|FR 345 15'.
Descriptions with unrecognised channel names are ignored.
@item lfegain
Set custom gain for LFE channels. Value is in dB. Default is 0.
@end table
@subsection Examples

4
libavfilter/af_sofalizer.c
View File

@ -70,6 +70,7 @@ typedef struct SOFAlizerContext {
float *speaker_azim; /* azimuth of the virtual loudspeakers */
float *speaker_elev; /* elevation of the virtual loudspeakers */
char *speakers_pos; /* custom positions of the virtual loudspeakers */
float lfe_gain; /* initial gain for the LFE channel */
float gain_lfe; /* gain applied to LFE channel */
int lfe_channel; /* LFE channel position in channel layout */
@ -1067,7 +1068,7 @@ static int config_input(AVFilterLink *inlink)
}
/* gain -3 dB per channel, -6 dB to get LFE on a similar level */
s->gain_lfe = expf((s->gain - 3 * inlink->channels - 6) / 20 * M_LN10);
s->gain_lfe = expf((s->gain - 3 * inlink->channels - 6 + s->lfe_gain) / 20 * M_LN10);
s->n_conv = nb_input_channels;
@ -1197,6 +1198,7 @@ static const AVOption sofalizer_options[] = {
{ "time", "time domain", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, .flags = FLAGS, "type" },
{ "freq", "frequency domain", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, .flags = FLAGS, "type" },
{ "speakers", "set speaker custom positions", OFFSET(speakers_pos), AV_OPT_TYPE_STRING, {.str=0}, 0, 0, .flags = FLAGS },
{ "lfegain", "set lfe gain", OFFSET(lfe_gain), AV_OPT_TYPE_FLOAT, {.dbl=0}, -9, 9, .flags = FLAGS },
{ NULL }
};