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Code Issues Releases Wiki Activity

af_lavrresample: add normalize suboption

This commit is contained in:
wm4 2015-09-08 22:04:45 +02:00
parent 0eb72d786c
commit 4eae4a5da7
2 changed files with 13 additions and 1 deletions
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7
DOCS/man/af.rst
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@ -59,6 +59,13 @@ Available filters are:
(If you just want to set defaults for this filter that will be used
even by automatically inserted lavrresample instances, you should
prefer setting them with ``--af-defaults=lavrresample:...``.)
``normalize=<yes|no>``
Whether to normalize when remixing channel layouts (default: yes). This
is e.g. applied when downmixing surround audio to stereo. The advantage
is that this guarantees that no clipping can happen. Unfortunately,
this can also lead to too low volume levels. Whether you enable or
disable this is essentially a matter of taste, but the default uses
the safer choice.
``o=<string>``
Set AVOptions on the SwrContext or AVAudioResampleContext. These should
be documented by FFmpeg or Libav.

7
audio/filter/af_lavrresample.c
View File

@ -65,6 +65,7 @@ struct af_resample_opts {
int phase_shift;
int linear;
double cutoff;
int normalize;
int in_rate_af; // filter input sample rate
int in_rate; // actual rate (used by lavr), adjusted for playback speed
@ -234,7 +235,9 @@ static int configure_lavrr(struct af_instance *af, struct mp_audio *in,
av_opt_set_double(s->avrctx, "cutoff", s->ctx.cutoff, 0);
#if HAVE_LIBSWRESAMPLE
av_opt_set_double(s->avrctx, "rematrix_maxval", 1.0, 0);
av_opt_set_double(s->avrctx, "rematrix_maxval", s->opts.normalize ? 1 : 1000, 0);
#else
av_opt_set_int(s->avrctx, "normalize_mix_level", s->opts.normalize, 0);
#endif
if (mp_set_avopts(af->log, s->avrctx, s->avopts) < 0)
@ -546,6 +549,7 @@ const struct af_info af_info_lavrresample = {
.filter_size = 16,
.cutoff = 0.0,
.phase_shift = 10,
.normalize = 1,
},
.playback_speed = 1.0,
.allow_detach = 1,
@ -556,6 +560,7 @@ const struct af_info af_info_lavrresample = {
OPT_FLAG("linear", opts.linear, 0),
OPT_DOUBLE("cutoff", opts.cutoff, M_OPT_RANGE, .min = 0, .max = 1),
OPT_FLAG("detach", allow_detach, 0),
OPT_FLAG("normalize", opts.normalize, 0),
OPT_KEYVALUELIST("o", avopts, 0),
{0}
},