[FFmpeg-devel] [PATCH 4/4] avfilter/af_biquads: add reverse filtering support
Paul B Mahol
onemda at gmail.com
Sun May 24 20:03:08 EEST 2020
Add it to all filters, except allpass as it does not make sense
to use it in such case.
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 72 +++++++++++
libavfilter/af_biquads.c | 271 +++++++++++++++++++++++++++++++++++++--
2 files changed, 333 insertions(+), 10 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index 5af4797b7e..773473f721 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2691,6 +2691,15 @@ Specify which channels to filter, by default all available are filtered.
@item normalize, n
Normalize biquad coefficients, by default is disabled.
Enabling it will normalize magnitude response at DC to 0dB.
+
+ at item reverse, r
+Enable reverse filter processing. Makes filter's phase response
+linear at cost of introduced latency.
+
+ at item size, s
+Set size of window for reverse filter processing.
+Allowed range is from 256 to 32768.
+Default value is 2048.
@end table
@subsection Commands
@@ -2754,6 +2763,15 @@ Specify which channels to filter, by default all available are filtered.
@item normalize, n
Normalize biquad coefficients, by default is disabled.
Enabling it will normalize magnitude response at DC to 0dB.
+
+ at item reverse, r
+Enable reverse filter processing. Makes filter's phase response
+linear at cost of introduced latency.
+
+ at item size, s
+Set size of window for reverse filter processing.
+Allowed range is from 256 to 32768.
+Default value is 2048.
@end table
@subsection Commands
@@ -2824,6 +2842,15 @@ Specify which channels to filter, by default all available are filtered.
@item normalize, n
Normalize biquad coefficients, by default is disabled.
Enabling it will normalize magnitude response at DC to 0dB.
+
+ at item reverse, r
+Enable reverse filter processing. Makes filter's phase response
+linear at cost of introduced latency.
+
+ at item size, s
+Set size of window for reverse filter processing.
+Allowed range is from 256 to 32768.
+Default value is 2048.
@end table
@subsection Commands
@@ -2882,6 +2909,15 @@ Specify which channels to filter, by default all available are filtered.
@item normalize, n
Normalize biquad coefficients, by default is disabled.
Enabling it will normalize magnitude response at DC to 0dB.
+
+ at item reverse, r
+Enable reverse filter processing. Makes filter's phase response
+linear at cost of introduced latency.
+
+ at item size, s
+Set size of window for reverse filter processing.
+Allowed range is from 256 to 32768.
+Default value is 2048.
@end table
@section bs2b
@@ -3605,6 +3641,15 @@ Specify which channels to filter, by default all available are filtered.
@item normalize, n
Normalize biquad coefficients, by default is disabled.
Enabling it will normalize magnitude response at DC to 0dB.
+
+ at item reverse, r
+Enable reverse filter processing. Makes filter's phase response
+linear at cost of introduced latency.
+
+ at item size, s
+Set size of window for reverse filter processing.
+Allowed range is from 256 to 32768.
+Default value is 2048.
@end table
@subsection Examples
@@ -4082,6 +4127,15 @@ Specify which channels to filter, by default all available are filtered.
@item normalize, n
Normalize biquad coefficients, by default is disabled.
Enabling it will normalize magnitude response at DC to 0dB.
+
+ at item reverse, r
+Enable reverse filter processing. Makes filter's phase response
+linear at cost of introduced latency.
+
+ at item size, s
+Set size of window for reverse filter processing.
+Allowed range is from 256 to 32768.
+Default value is 2048.
@end table
@subsection Commands
@@ -4405,6 +4459,15 @@ Specify which channels to filter, by default all available are filtered.
@item normalize, n
Normalize biquad coefficients, by default is disabled.
Enabling it will normalize magnitude response at DC to 0dB.
+
+ at item reverse, r
+Enable reverse filter processing. Makes filter's phase response
+linear at cost of introduced latency.
+
+ at item size, s
+Set size of window for reverse filter processing.
+Allowed range is from 256 to 32768.
+Default value is 2048.
@end table
@subsection Examples
@@ -5525,6 +5588,15 @@ Specify which channels to filter, by default all available are filtered.
@item normalize, n
Normalize biquad coefficients, by default is disabled.
Enabling it will normalize magnitude response at DC to 0dB.
+
+ at item reverse, r
+Enable reverse filter processing. Makes filter's phase response
+linear at cost of introduced latency.
+
+ at item size, s
+Set size of window for reverse filter processing.
+Allowed range is from 256 to 32768.
+Default value is 2048.
@end table
@subsection Commands
diff --git a/libavfilter/af_biquads.c b/libavfilter/af_biquads.c
index ef28db741a..a9dcc7658d 100644
--- a/libavfilter/af_biquads.c
+++ b/libavfilter/af_biquads.c
@@ -97,6 +97,8 @@ enum WidthType {
typedef struct ChanCache {
double i1, i2;
double o1, o2;
+ double ri1, ri2;
+ double ro1, ro2;
int clippings;
} ChanCache;
@@ -107,6 +109,7 @@ typedef struct BiquadsContext {
int width_type;
int poles;
int csg;
+ int reverse;
double gain;
double frequency;
@@ -122,10 +125,18 @@ typedef struct BiquadsContext {
ChanCache *cache;
int block_align;
+ AVFrame *frame;
+ int window_size;
+ int hop_size;
+ double *window_func_lut;
+
void (*filter)(struct BiquadsContext *s, const void *ibuf, void *obuf, int len,
double *i1, double *i2, double *o1, double *o2,
double b0, double b1, double b2, double a1, double a2, int *clippings,
int disabled);
+ void (*reverse_filter)(struct BiquadsContext *s, const void *ibuf, void *obuf, void *dst,
+ int len, double *i1, double *i2, double *o1, double *o2,
+ double b0, double b1, double b2, double a1, double a2, int *clippings);
} BiquadsContext;
static av_cold int init(AVFilterContext *ctx)
@@ -259,6 +270,99 @@ BIQUAD_FILTER(s32, int32_t, INT32_MIN, INT32_MAX, 1)
BIQUAD_FILTER(flt, float, -1., 1., 0)
BIQUAD_FILTER(dbl, double, -1., 1., 0)
+#define BIQUAD_FILTER_REVERSE(name, type, min, max, need_clipping) \
+static void biquad_reverse_## name (BiquadsContext *s, \
+ const void *input, void *output, void *dst, \
+ int len, \
+ double *in1, double *in2, \
+ double *out1, double *out2, \
+ double b0, double b1, double b2, \
+ double a1, double a2, int *clippings) \
+{ \
+ const type *ibuf = input; \
+ type *obuf = output; \
+ type *dbuf = dst; \
+ double o0; \
+ double i1 = *in1; \
+ double i2 = *in2; \
+ double o1 = *out1; \
+ double o2 = *out2; \
+ double wet = s->mix; \
+ double dry = 1. - wet; \
+ double out; \
+ int i, j; \
+ const double *w = s->window_func_lut; \
+ \
+ a1 = -a1; \
+ a2 = -a2; \
+ \
+ for (i = 0; i+1 < len; i++) { \
+ j = len - 1 - i; \
+ o2 = i2 * b2 + i1 * b1 + ibuf[j] * b0 + o2 * a2 + o1 * a1; \
+ i2 = ibuf[j]; \
+ out = o2 * wet + i2 * dry; \
+ if (need_clipping && out < min) { \
+ (*clippings)++; \
+ obuf[j] = min; \
+ } else if (need_clipping && out > max) { \
+ (*clippings)++; \
+ obuf[j] = max; \
+ } else { \
+ obuf[j] = out; \
+ } \
+ i++; \
+ j = len - 1 - i; \
+ o1 = i1 * b2 + i2 * b1 + ibuf[j] * b0 + o1 * a2 + o2 * a1; \
+ i1 = ibuf[j]; \
+ out = o1 * wet + i1 * dry; \
+ if (need_clipping && out < min) { \
+ (*clippings)++; \
+ obuf[j] = min; \
+ } else if (need_clipping && out > max) { \
+ (*clippings)++; \
+ obuf[j] = max; \
+ } else { \
+ obuf[j] = out; \
+ } \
+ } \
+ if (i < len) { \
+ j = len - 1 - i; \
+ o0 = ibuf[j] * b0 + i1 * b1 + i2 * b2 + o1 * a1 + o2 * a2; \
+ i2 = i1; \
+ i1 = ibuf[j]; \
+ o2 = o1; \
+ o1 = o0; \
+ out = o0 * wet + i1 * dry; \
+ if (need_clipping && out < min) { \
+ (*clippings)++; \
+ obuf[j] = min; \
+ } else if (need_clipping && out > max) { \
+ (*clippings)++; \
+ obuf[j] = max; \
+ } else { \
+ obuf[j] = out; \
+ } \
+ } \
+ *in1 = i1; \
+ *in2 = i2; \
+ *out1 = o1; \
+ *out2 = o2; \
+ \
+ for (i = 0; i < len; i++) \
+ dbuf[i] += obuf[i] * w[i]; \
+ for (i = 0; i < s->hop_size; i++) \
+ obuf[i] = dbuf[i]; \
+ memmove(dbuf, dbuf + s->hop_size, \
+ (s->window_size * 2 - s->hop_size) * s->block_align); \
+ memset(dbuf + s->window_size * 2 - s->hop_size, 0, \
+ s->hop_size * s->block_align); \
+}
+
+BIQUAD_FILTER_REVERSE(s16, int16_t, INT16_MIN, INT16_MAX, 1)
+BIQUAD_FILTER_REVERSE(s32, int32_t, INT32_MIN, INT32_MAX, 1)
+BIQUAD_FILTER_REVERSE(flt, float, -1., 1., 0)
+BIQUAD_FILTER_REVERSE(dbl, double, -1., 1., 0)
+
static int config_filter(AVFilterLink *outlink, int reset)
{
AVFilterContext *ctx = outlink->src;
@@ -269,6 +373,18 @@ static int config_filter(AVFilterLink *outlink, int reset)
double K = tan(w0 / 2.);
double alpha, beta;
+ if (reset) {
+ s->window_size = s->hop_size * 2;
+ s->window_func_lut = av_calloc(s->window_size, sizeof(*s->window_func_lut));
+ if (!s->window_func_lut)
+ return AVERROR(ENOMEM);
+ for (int i = 0; i < s->window_size; i++)
+ s->window_func_lut[i] = .5*(1-cos(2*M_PI*i/(s->window_size-1)));
+ s->frame = ff_get_audio_buffer(outlink, s->window_size * 2);
+ if (!s->frame)
+ return AVERROR(ENOMEM);
+ }
+
if (w0 > M_PI) {
av_log(ctx, AV_LOG_ERROR,
"Invalid frequency %f. Frequency must be less than half the sample-rate %d.\n",
@@ -439,10 +555,22 @@ static int config_filter(AVFilterLink *outlink, int reset)
memset(s->cache, 0, sizeof(ChanCache) * inlink->channels);
switch (inlink->format) {
- case AV_SAMPLE_FMT_S16P: s->filter = biquad_s16; break;
- case AV_SAMPLE_FMT_S32P: s->filter = biquad_s32; break;
- case AV_SAMPLE_FMT_FLTP: s->filter = biquad_flt; break;
- case AV_SAMPLE_FMT_DBLP: s->filter = biquad_dbl; break;
+ case AV_SAMPLE_FMT_S16P:
+ s->filter = biquad_s16;
+ s->reverse_filter = biquad_reverse_s16;
+ break;
+ case AV_SAMPLE_FMT_S32P:
+ s->filter = biquad_s32;
+ s->reverse_filter = biquad_reverse_s32;
+ break;
+ case AV_SAMPLE_FMT_FLTP:
+ s->filter = biquad_flt;
+ s->reverse_filter = biquad_reverse_flt;
+ break;
+ case AV_SAMPLE_FMT_DBLP:
+ s->filter = biquad_dbl;
+ s->reverse_filter = biquad_reverse_dbl;
+ break;
default: av_assert0(0);
}
@@ -457,9 +585,44 @@ static int config_output(AVFilterLink *outlink)
}
typedef struct ThreadData {
- AVFrame *in, *out;
+ AVFrame *in, *out, *tmp;
} ThreadData;
+static int reverse_filter_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+ BiquadsContext *s = ctx->priv;
+ AVFilterLink *inlink = ctx->inputs[0];
+ ThreadData *td = arg;
+ AVFrame *buf = td->in;
+ AVFrame *out_buf = td->out;
+ AVFrame *tmp_buf = td->tmp;
+ AVFrame *dst_buf = s->frame;
+ const int start = (buf->channels * jobnr) / nb_jobs;
+ const int end = (buf->channels * (jobnr+1)) / nb_jobs;
+ int ch;
+
+ for (ch = start; ch < end; ch++) {
+ if (!((av_channel_layout_extract_channel(inlink->channel_layout, ch) & s->channels))) {
+ if (buf != out_buf)
+ memcpy(out_buf->extended_data[ch], buf->extended_data[ch],
+ buf->nb_samples * s->block_align);
+ continue;
+ }
+
+ s->filter(s, buf->extended_data[ch], tmp_buf->extended_data[ch], buf->nb_samples,
+ &s->cache[ch].i1, &s->cache[ch].i2, &s->cache[ch].o1, &s->cache[ch].o2,
+ s->b0, s->b1, s->b2, s->a1, s->a2, &s->cache[ch].clippings, ctx->is_disabled);
+ s->reverse_filter(s, tmp_buf->extended_data[ch], out_buf->extended_data[ch],
+ dst_buf->extended_data[ch],
+ tmp_buf->nb_samples, &s->cache[ch].ri1, &s->cache[ch].ri2,
+ &s->cache[ch].ro1, &s->cache[ch].ro2,
+ s->b0, s->b1, s->b2, s->a1, s->a2,
+ &s->cache[ch].clippings);
+ }
+
+ return 0;
+}
+
static int filter_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
AVFilterLink *inlink = ctx->inputs[0];
@@ -487,6 +650,46 @@ static int filter_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_job
return 0;
}
+static int reverse_filter_frame(AVFilterLink *inlink, AVFrame *buf)
+{
+ AVFilterContext *ctx = inlink->dst;
+ BiquadsContext *s = ctx->priv;
+ AVFilterLink *outlink = ctx->outputs[0];
+ AVFrame *out_buf, *tmp_buf;
+ ThreadData td;
+ int ch;
+
+ out_buf = ff_get_audio_buffer(outlink, buf->nb_samples);
+ tmp_buf = ff_get_audio_buffer(outlink, buf->nb_samples);
+ if (!out_buf || !tmp_buf) {
+ av_frame_free(&out_buf);
+ av_frame_free(&tmp_buf);
+ av_frame_free(&buf);
+ return AVERROR(ENOMEM);
+ }
+ av_frame_copy_props(out_buf, buf);
+
+ td.in = buf;
+ td.out = out_buf;
+ td.tmp = tmp_buf;
+ ctx->internal->execute(ctx, reverse_filter_channel, &td, NULL,
+ FFMIN(outlink->channels, ff_filter_get_nb_threads(ctx)));
+
+ for (ch = 0; ch < outlink->channels; ch++) {
+ if (s->cache[ch].clippings > 0)
+ av_log(ctx, AV_LOG_WARNING, "Channel %d clipping %d times. Please reduce gain.\n",
+ ch, s->cache[ch].clippings);
+ s->cache[ch].clippings = 0;
+ }
+
+ out_buf->nb_samples = FFMIN(buf->nb_samples, s->hop_size);
+ av_frame_free(&buf);
+ av_frame_free(&tmp_buf);
+ ff_inlink_skip_samples(inlink, s->hop_size);
+
+ return ff_filter_frame(outlink, out_buf);
+}
+
static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
{
AVFilterContext *ctx = inlink->dst;
@@ -526,6 +729,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
static int activate(AVFilterContext *ctx)
{
+ BiquadsContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *in = NULL;
@@ -533,13 +737,18 @@ static int activate(AVFilterContext *ctx)
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
- ret = ff_inlink_consume_frame(inlink, &in);
- if (ret < 0)
- return ret;
- if (ret > 0) {
- ret = filter_frame(inlink, in);
+ if (s->reverse) {
+ ret = ff_inlink_peek_samples(inlink, s->window_size, &in);
+ if (ret < 0)
+ return ret;
+ if (ret > 0)
+ return reverse_filter_frame(inlink, in);
+ } else {
+ ret = ff_inlink_consume_frame(inlink, &in);
if (ret < 0)
return ret;
+ if (ret > 0)
+ return filter_frame(inlink, in);
}
FF_FILTER_FORWARD_STATUS(inlink, outlink);
@@ -566,6 +775,8 @@ static av_cold void uninit(AVFilterContext *ctx)
BiquadsContext *s = ctx->priv;
av_freep(&s->cache);
+ av_freep(&s->window_func_lut);
+ av_frame_free(&s->frame);
}
static const AVFilterPad inputs[] = {
@@ -635,6 +846,10 @@ static const AVOption equalizer_options[] = {
{"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"reverse", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"r", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"size", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
+ {"s", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
{NULL}
};
@@ -661,6 +876,10 @@ static const AVOption bass_options[] = {
{"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"reverse", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"r", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"size", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
+ {"s", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
{NULL}
};
@@ -687,6 +906,10 @@ static const AVOption treble_options[] = {
{"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"reverse", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"r", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"size", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
+ {"s", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
{NULL}
};
@@ -712,6 +935,10 @@ static const AVOption bandpass_options[] = {
{"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"reverse", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"r", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"size", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
+ {"s", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
{NULL}
};
@@ -736,6 +963,10 @@ static const AVOption bandreject_options[] = {
{"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"reverse", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"r", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"size", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
+ {"s", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
{NULL}
};
@@ -762,6 +993,10 @@ static const AVOption lowpass_options[] = {
{"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"reverse", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"r", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"size", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
+ {"s", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
{NULL}
};
@@ -788,6 +1023,10 @@ static const AVOption highpass_options[] = {
{"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"reverse", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"r", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"size", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
+ {"s", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
{NULL}
};
@@ -840,6 +1079,10 @@ static const AVOption lowshelf_options[] = {
{"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"reverse", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"r", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"size", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
+ {"s", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
{NULL}
};
@@ -866,6 +1109,10 @@ static const AVOption highshelf_options[] = {
{"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"reverse", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"r", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"size", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
+ {"s", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
{NULL}
};
@@ -885,6 +1132,10 @@ static const AVOption biquad_options[] = {
{"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"reverse", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"r", "reverse filtering", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF},
+ {"size", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
+ {"s", "set window size for reverse filtering", OFFSET(hop_size), AV_OPT_TYPE_INT, {.i64=2048}, 256, 32768, AF},
{NULL}
};
--
2.17.1
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