Pass the cutoff option from lavc's avcodec_options[] to libmp3lame's
lowpass option, without allowing to adjust its default behavior.
Signed-off-by: Moritz Barsnick <barsn...@gmx.net>
---
doc/encoders.texi | 4 ++++
libavcodec/libmp3lame.c | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/doc/encoders.texi b/doc/encoders.texi
index cbb8d8e..5e311cb 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -817,6 +817,10 @@ Set algorithm quality. Valid arguments are integers in the
0-9 range,
with 0 meaning highest quality but slowest, and 9 meaning fastest
while producing the worst quality.
+@item cutoff (@emph{--lowpass})
+Set lowpass cutoff frequency. If unspecified, the encoder dynamically
+adjusts the cutoff.
+
@item reservoir
Enable use of bit reservoir when set to 1. Default value is 1. LAME
has this enabled by default, but can be overridden by use
diff --git a/libavcodec/libmp3lame.c b/libavcodec/libmp3lame.c
index e55aa85..5e26743 100644
--- a/libavcodec/libmp3lame.c
+++ b/libavcodec/libmp3lame.c
@@ -125,6 +125,10 @@ static av_cold int mp3lame_encode_init(AVCodecContext
*avctx)
}
}
+ /* lowpass cutoff frequency */
+ if (avctx->cutoff)
+ lame_set_lowpassfreq(s->gfp, avctx->cutoff);
+
/* do not get a Xing VBR header frame from LAME */
lame_set_bWriteVbrTag(s->gfp,0);
--
2.7.4
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