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avfilter/af_surround: make volume configurable for front center and lfe channel

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This commit is contained in:
Paul B Mahol 2017-08-26 11:26:48 +02:00
parent e0436ddaa4
commit 9d6aab6fa1
2 changed files with 50 additions and 2 deletions
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12
doc/filters.texi
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@ -3927,6 +3927,18 @@ Set LFE low cut off frequency. By default, this is @var{128} Hz.
@item lfe_high
Set LFE high cut off frequency. By default, this is @var{256} Hz.
@item fc_in
Set front center input volume. By default, this is @var{1}.
@item fc_out
Set front center output volume. By default, this is @var{1}.
@item lfe_in
Set LFE input volume. By default, this is @var{1}.
@item lfe_out
Set LFE output volume. By default, this is @var{1}.
@end table
@section treble

40
libavfilter/af_surround.c
View File

@ -31,8 +31,16 @@ typedef struct AudioSurroundContext {
char *out_channel_layout_str;
char *in_channel_layout_str;
float level_in;
float level_out;
float fc_in;
float fc_out;
float lfe_in;
float lfe_out;
float *input_levels;
float *output_levels;
int output_lfe;
int lowcutf;
int highcutf;
@ -148,6 +156,17 @@ static int config_input(AVFilterLink *inlink)
return AVERROR(ENOMEM);
}
s->nb_in_channels = inlink->channels;
s->input_levels = av_malloc_array(s->nb_in_channels, sizeof(*s->input_levels));
if (!s->input_levels)
return AVERROR(ENOMEM);
for (ch = 0; ch < s->nb_in_channels; ch++)
s->input_levels[ch] = s->level_in;
ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_FRONT_CENTER);
if (ch >= 0)
s->input_levels[ch] *= s->fc_in;
ch = av_get_channel_layout_channel_index(inlink->channel_layout, AV_CH_LOW_FREQUENCY);
if (ch >= 0)
s->input_levels[ch] *= s->lfe_in;
s->input = ff_get_audio_buffer(inlink, s->buf_size * 2);
if (!s->input)
@ -179,6 +198,17 @@ static int config_output(AVFilterLink *outlink)
return AVERROR(ENOMEM);
}
s->nb_out_channels = outlink->channels;
s->output_levels = av_malloc_array(s->nb_out_channels, sizeof(*s->output_levels));
if (!s->output_levels)
return AVERROR(ENOMEM);
for (ch = 0; ch < s->nb_out_channels; ch++)
s->output_levels[ch] = s->level_out;
ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_FRONT_CENTER);
if (ch >= 0)
s->output_levels[ch] *= s->fc_out;
ch = av_get_channel_layout_channel_index(outlink->channel_layout, AV_CH_LOW_FREQUENCY);
if (ch >= 0)
s->output_levels[ch] *= s->lfe_out;
s->output = ff_get_audio_buffer(outlink, s->buf_size * 2);
s->overlap_buffer = ff_get_audio_buffer(outlink, s->buf_size * 2);
@ -1068,7 +1098,7 @@ fail:
static int fft_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
{
AudioSurroundContext *s = ctx->priv;
const float level_in = s->level_in;
const float level_in = s->input_levels[ch];
float *dst;
int n;
@ -1087,7 +1117,7 @@ static int fft_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
static int ifft_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
{
AudioSurroundContext *s = ctx->priv;
const float level_out = s->level_out;
const float level_out = s->output_levels[ch];
AVFrame *out = arg;
float *dst, *ptr;
int n;
@ -1173,6 +1203,8 @@ static av_cold void uninit(AVFilterContext *ctx)
for (ch = 0; ch < s->nb_out_channels; ch++) {
av_rdft_end(s->irdft[ch]);
}
av_freep(&s->input_levels);
av_freep(&s->output_levels);
av_freep(&s->rdft);
av_freep(&s->irdft);
av_audio_fifo_free(s->fifo);
@ -1190,6 +1222,10 @@ static const AVOption surround_options[] = {
{ "lfe", "output LFE", OFFSET(output_lfe), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ "lfe_low", "LFE low cut off", OFFSET(lowcutf), AV_OPT_TYPE_INT, {.i64=128}, 0, 256, FLAGS },
{ "lfe_high", "LFE high cut off", OFFSET(highcutf), AV_OPT_TYPE_INT, {.i64=256}, 0, 512, FLAGS },
{ "fc_in", "set front center channel input level", OFFSET(fc_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
{ "fc_out", "set front center channel output level", OFFSET(fc_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
{ "lfe_in", "set lfe channel input level", OFFSET(lfe_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
{ "lfe_out", "set lfe channel output level", OFFSET(lfe_out), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, FLAGS },
{ NULL }
};