#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/eval.h"
+#include "libavutil/float_dsp.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#define MAX_SPLITS 16
#define MAX_BANDS MAX_SPLITS + 1
-typedef struct BiquadContext {
- double a0, a1, a2;
- double b1, b2;
- double i1, i2;
- double o1, o2;
-} BiquadContext;
+#define B0 0
+#define B1 1
+#define B2 2
+#define A1 3
+#define A2 4
-typedef struct CrossoverChannel {
- BiquadContext lp[MAX_BANDS][4];
- BiquadContext hp[MAX_BANDS][4];
-} CrossoverChannel;
+typedef struct BiquadCoeffs {
+ double cd[5];
+ float cf[5];
+} BiquadCoeffs;
typedef struct AudioCrossoverContext {
const AVClass *class;
char *splits_str;
- int order;
+ char *gains_str;
+ int order_opt;
+ float level_in;
+ int order;
int filter_count;
+ int first_order;
+ int ap_filter_count;
int nb_splits;
- float *splits;
+ float splits[MAX_SPLITS];
+
+ float gains[MAX_BANDS];
+
+ BiquadCoeffs lp[MAX_BANDS][20];
+ BiquadCoeffs hp[MAX_BANDS][20];
+ BiquadCoeffs ap[MAX_BANDS][20];
+
+ AVFrame *xover;
- CrossoverChannel *xover;
+ AVFrame *input_frame;
+ AVFrame *frames[MAX_BANDS];
+
+ int (*filter_channels)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
+
+ AVFloatDSPContext *fdsp;
} AudioCrossoverContext;
#define OFFSET(x) offsetof(AudioCrossoverContext, x)
static const AVOption acrossover_options[] = {
{ "split", "set split frequencies", OFFSET(splits_str), AV_OPT_TYPE_STRING, {.str="500"}, 0, 0, AF },
- { "order", "set order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=1}, 0, 2, AF, "m" },
- { "2nd", "2nd order", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, AF, "m" },
- { "4th", "4th order", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AF, "m" },
- { "8th", "8th order", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, AF, "m" },
+ { "order", "set filter order", OFFSET(order_opt), AV_OPT_TYPE_INT, {.i64=1}, 0, 9, AF, "m" },
+ { "2nd", "2nd order (12 dB/8ve)", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, AF, "m" },
+ { "4th", "4th order (24 dB/8ve)", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AF, "m" },
+ { "6th", "6th order (36 dB/8ve)", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, AF, "m" },
+ { "8th", "8th order (48 dB/8ve)", 0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, AF, "m" },
+ { "10th", "10th order (60 dB/8ve)",0, AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, AF, "m" },
+ { "12th", "12th order (72 dB/8ve)",0, AV_OPT_TYPE_CONST, {.i64=5}, 0, 0, AF, "m" },
+ { "14th", "14th order (84 dB/8ve)",0, AV_OPT_TYPE_CONST, {.i64=6}, 0, 0, AF, "m" },
+ { "16th", "16th order (96 dB/8ve)",0, AV_OPT_TYPE_CONST, {.i64=7}, 0, 0, AF, "m" },
+ { "18th", "18th order (108 dB/8ve)",0, AV_OPT_TYPE_CONST, {.i64=8}, 0, 0, AF, "m" },
+ { "20th", "20th order (120 dB/8ve)",0, AV_OPT_TYPE_CONST, {.i64=9}, 0, 0, AF, "m" },
+ { "level", "set input gain", OFFSET(level_in), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 1, AF },
+ { "gain", "set output bands gain", OFFSET(gains_str), AV_OPT_TYPE_STRING, {.str="1.f"}, 0, 0, AF },
{ NULL }
};
AVFILTER_DEFINE_CLASS(acrossover);
+static int parse_gains(AVFilterContext *ctx)
+{
+ AudioCrossoverContext *s = ctx->priv;
+ char *p, *arg, *saveptr = NULL;
+ int i, ret = 0;
+
+ saveptr = NULL;
+ p = s->gains_str;
+ for (i = 0; i < MAX_BANDS; i++) {
+ float gain;
+ char c[3] = { 0 };
+
+ if (!(arg = av_strtok(p, " |", &saveptr)))
+ break;
+
+ p = NULL;
+
+ if (av_sscanf(arg, "%f%2s", &gain, c) < 1) {
+ av_log(ctx, AV_LOG_ERROR, "Invalid syntax for gain[%d].\n", i);
+ ret = AVERROR(EINVAL);
+ break;
+ }
+
+ if (c[0] == 'd' && c[1] == 'B')
+ s->gains[i] = expf(gain * M_LN10 / 20.f);
+ else
+ s->gains[i] = gain;
+ }
+
+ for (; i < MAX_BANDS; i++)
+ s->gains[i] = 1.f;
+
+ return ret;
+}
+
static av_cold int init(AVFilterContext *ctx)
{
AudioCrossoverContext *s = ctx->priv;
char *p, *arg, *saveptr = NULL;
int i, ret = 0;
- s->splits = av_calloc(MAX_SPLITS, sizeof(*s->splits));
- if (!s->splits)
+ s->fdsp = avpriv_float_dsp_alloc(0);
+ if (!s->fdsp)
return AVERROR(ENOMEM);
p = s->splits_str;
p = NULL;
- av_sscanf(arg, "%f", &freq);
+ if (av_sscanf(arg, "%f", &freq) != 1) {
+ av_log(ctx, AV_LOG_ERROR, "Invalid syntax for frequency[%d].\n", i);
+ return AVERROR(EINVAL);
+ }
if (freq <= 0) {
av_log(ctx, AV_LOG_ERROR, "Frequency %f must be positive number.\n", freq);
return AVERROR(EINVAL);
s->nb_splits = i;
+ ret = parse_gains(ctx);
+ if (ret < 0)
+ return ret;
+
for (i = 0; i <= s->nb_splits; i++) {
AVFilterPad pad = { 0 };
char *name;
return ret;
}
-static void set_lp(BiquadContext *b, float fc, float q, float sr)
+static void set_lp(BiquadCoeffs *b, double fc, double q, double sr)
{
- double omega = (2.0 * M_PI * fc / sr);
- double sn = sin(omega);
- double cs = cos(omega);
- double alpha = (sn / (2 * q));
- double inv = (1.0 / (1.0 + alpha));
-
- b->a2 = b->a0 = (inv * (1.0 - cs) * 0.5);
- b->a1 = b->a0 + b->a0;
- b->b1 = -2. * cs * inv;
- b->b2 = (1. - alpha) * inv;
+ double omega = 2. * M_PI * fc / sr;
+ double cosine = cos(omega);
+ double alpha = sin(omega) / (2. * q);
+
+ double b0 = (1. - cosine) / 2.;
+ double b1 = 1. - cosine;
+ double b2 = (1. - cosine) / 2.;
+ double a0 = 1. + alpha;
+ double a1 = -2. * cosine;
+ double a2 = 1. - alpha;
+
+ b->cd[B0] = b0 / a0;
+ b->cd[B1] = b1 / a0;
+ b->cd[B2] = b2 / a0;
+ b->cd[A1] = -a1 / a0;
+ b->cd[A2] = -a2 / a0;
+
+ b->cf[B0] = b->cd[B0];
+ b->cf[B1] = b->cd[B1];
+ b->cf[B2] = b->cd[B2];
+ b->cf[A1] = b->cd[A1];
+ b->cf[A2] = b->cd[A2];
}
-static void set_hp(BiquadContext *b, float fc, float q, float sr)
+static void set_hp(BiquadCoeffs *b, double fc, double q, double sr)
{
- double omega = 2 * M_PI * fc / sr;
- double sn = sin(omega);
- double cs = cos(omega);
- double alpha = sn / (2 * q);
- double inv = 1.0 / (1.0 + alpha);
-
- b->a0 = inv * (1. + cs) / 2.;
- b->a1 = -2. * b->a0;
- b->a2 = b->a0;
- b->b1 = -2. * cs * inv;
- b->b2 = (1. - alpha) * inv;
+ double omega = 2. * M_PI * fc / sr;
+ double cosine = cos(omega);
+ double alpha = sin(omega) / (2. * q);
+
+ double b0 = (1. + cosine) / 2.;
+ double b1 = -1. - cosine;
+ double b2 = (1. + cosine) / 2.;
+ double a0 = 1. + alpha;
+ double a1 = -2. * cosine;
+ double a2 = 1. - alpha;
+
+ b->cd[B0] = b0 / a0;
+ b->cd[B1] = b1 / a0;
+ b->cd[B2] = b2 / a0;
+ b->cd[A1] = -a1 / a0;
+ b->cd[A2] = -a2 / a0;
+
+ b->cf[B0] = b->cd[B0];
+ b->cf[B1] = b->cd[B1];
+ b->cf[B2] = b->cd[B2];
+ b->cf[A1] = b->cd[A1];
+ b->cf[A2] = b->cd[A2];
}
-static int config_input(AVFilterLink *inlink)
+static void set_ap(BiquadCoeffs *b, double fc, double q, double sr)
{
- AVFilterContext *ctx = inlink->dst;
- AudioCrossoverContext *s = ctx->priv;
- int ch, band, sample_rate = inlink->sample_rate;
- double q;
-
- s->xover = av_calloc(inlink->channels, sizeof(*s->xover));
- if (!s->xover)
- return AVERROR(ENOMEM);
+ double omega = 2. * M_PI * fc / sr;
+ double cosine = cos(omega);
+ double alpha = sin(omega) / (2. * q);
+
+ double a0 = 1. + alpha;
+ double a1 = -2. * cosine;
+ double a2 = 1. - alpha;
+ double b0 = a2;
+ double b1 = a1;
+ double b2 = a0;
+
+ b->cd[B0] = b0 / a0;
+ b->cd[B1] = b1 / a0;
+ b->cd[B2] = b2 / a0;
+ b->cd[A1] = -a1 / a0;
+ b->cd[A2] = -a2 / a0;
+
+ b->cf[B0] = b->cd[B0];
+ b->cf[B1] = b->cd[B1];
+ b->cf[B2] = b->cd[B2];
+ b->cf[A1] = b->cd[A1];
+ b->cf[A2] = b->cd[A2];
+}
- switch (s->order) {
- case 0:
- q = 0.5;
- s->filter_count = 1;
- break;
- case 1:
- q = M_SQRT1_2;
- s->filter_count = 2;
- break;
- case 2:
- q = 0.54;
- s->filter_count = 4;
- break;
- }
+static void set_ap1(BiquadCoeffs *b, double fc, double sr)
+{
+ double omega = 2. * M_PI * fc / sr;
+
+ b->cd[A1] = exp(-omega);
+ b->cd[A2] = 0.;
+ b->cd[B0] = -b->cd[A1];
+ b->cd[B1] = 1.;
+ b->cd[B2] = 0.;
+
+ b->cf[B0] = b->cd[B0];
+ b->cf[B1] = b->cd[B1];
+ b->cf[B2] = b->cd[B2];
+ b->cf[A1] = b->cd[A1];
+ b->cf[A2] = b->cd[A2];
+}
- for (ch = 0; ch < inlink->channels; ch++) {
- for (band = 0; band <= s->nb_splits; band++) {
- set_lp(&s->xover[ch].lp[band][0], s->splits[band], q, sample_rate);
- set_hp(&s->xover[ch].hp[band][0], s->splits[band], q, sample_rate);
-
- if (s->order > 1) {
- set_lp(&s->xover[ch].lp[band][1], s->splits[band], 1.34, sample_rate);
- set_hp(&s->xover[ch].hp[band][1], s->splits[band], 1.34, sample_rate);
- set_lp(&s->xover[ch].lp[band][2], s->splits[band], q, sample_rate);
- set_hp(&s->xover[ch].hp[band][2], s->splits[band], q, sample_rate);
- set_lp(&s->xover[ch].lp[band][3], s->splits[band], 1.34, sample_rate);
- set_hp(&s->xover[ch].hp[band][3], s->splits[band], 1.34, sample_rate);
- } else {
- set_lp(&s->xover[ch].lp[band][1], s->splits[band], q, sample_rate);
- set_hp(&s->xover[ch].hp[band][1], s->splits[band], q, sample_rate);
- }
- }
- }
+static void calc_q_factors(int order, double *q)
+{
+ double n = order / 2.;
- return 0;
+ for (int i = 0; i < n / 2; i++)
+ q[i] = 1. / (-2. * cos(M_PI * (2. * (i + 1) + n - 1.) / (2. * n)));
}
static int query_formats(AVFilterContext *ctx)
AVFilterFormats *formats;
AVFilterChannelLayouts *layouts;
static const enum AVSampleFormat sample_fmts[] = {
- AV_SAMPLE_FMT_DBLP,
+ AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP,
AV_SAMPLE_FMT_NONE
};
int ret;
return ff_set_common_samplerates(ctx, formats);
}
-static double biquad_process(BiquadContext *b, double in)
+#define BIQUAD_PROCESS(name, type) \
+static void biquad_process_## name(const type *const c, \
+ type *b, \
+ type *dst, const type *src, \
+ int nb_samples) \
+{ \
+ const type b0 = c[B0]; \
+ const type b1 = c[B1]; \
+ const type b2 = c[B2]; \
+ const type a1 = c[A1]; \
+ const type a2 = c[A2]; \
+ type z1 = b[0]; \
+ type z2 = b[1]; \
+ \
+ for (int n = 0; n + 1 < nb_samples; n++) { \
+ type in = src[n]; \
+ type out; \
+ \
+ out = in * b0 + z1; \
+ z1 = b1 * in + z2 + a1 * out; \
+ z2 = b2 * in + a2 * out; \
+ dst[n] = out; \
+ \
+ n++; \
+ in = src[n]; \
+ out = in * b0 + z1; \
+ z1 = b1 * in + z2 + a1 * out; \
+ z2 = b2 * in + a2 * out; \
+ dst[n] = out; \
+ } \
+ \
+ if (nb_samples & 1) { \
+ const int n = nb_samples - 1; \
+ const type in = src[n]; \
+ type out; \
+ \
+ out = in * b0 + z1; \
+ z1 = b1 * in + z2 + a1 * out; \
+ z2 = b2 * in + a2 * out; \
+ dst[n] = out; \
+ } \
+ \
+ b[0] = z1; \
+ b[1] = z2; \
+}
+
+BIQUAD_PROCESS(fltp, float)
+BIQUAD_PROCESS(dblp, double)
+
+#define XOVER_PROCESS(name, type, one, ff) \
+static int filter_channels_## name(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \
+{ \
+ AudioCrossoverContext *s = ctx->priv; \
+ AVFrame *in = s->input_frame; \
+ AVFrame **frames = s->frames; \
+ const int start = (in->channels * jobnr) / nb_jobs; \
+ const int end = (in->channels * (jobnr+1)) / nb_jobs; \
+ const int nb_samples = in->nb_samples; \
+ const int nb_outs = ctx->nb_outputs; \
+ const int first_order = s->first_order; \
+ \
+ for (int ch = start; ch < end; ch++) { \
+ const type *src = (const type *)in->extended_data[ch]; \
+ type *xover = (type *)s->xover->extended_data[ch]; \
+ \
+ s->fdsp->vector_## ff ##mul_scalar((type *)frames[0]->extended_data[ch], src, \
+ s->level_in, FFALIGN(nb_samples, sizeof(type))); \
+ \
+ for (int band = 0; band < nb_outs; band++) { \
+ for (int f = 0; band + 1 < nb_outs && f < s->filter_count; f++) { \
+ const type *prv = (const type *)frames[band]->extended_data[ch]; \
+ type *dst = (type *)frames[band + 1]->extended_data[ch]; \
+ const type *hsrc = f == 0 ? prv : dst; \
+ type *hp = xover + nb_outs * 20 + band * 20 + f * 2; \
+ const type *const hpc = (type *)&s->hp[band][f].c ## ff; \
+ \
+ biquad_process_## name(hpc, hp, dst, hsrc, nb_samples); \
+ } \
+ \
+ for (int f = 0; band + 1 < nb_outs && f < s->filter_count; f++) { \
+ type *dst = (type *)frames[band]->extended_data[ch]; \
+ const type *lsrc = dst; \
+ type *lp = xover + band * 20 + f * 2; \
+ const type *const lpc = (type *)&s->lp[band][f].c ## ff; \
+ \
+ biquad_process_## name(lpc, lp, dst, lsrc, nb_samples); \
+ } \
+ \
+ for (int aband = band + 1; aband + 1 < nb_outs; aband++) { \
+ if (first_order) { \
+ const type *asrc = (const type *)frames[band]->extended_data[ch]; \
+ type *dst = (type *)frames[band]->extended_data[ch]; \
+ type *ap = xover + nb_outs * 40 + (aband * nb_outs + band) * 20; \
+ const type *const apc = (type *)&s->ap[aband][0].c ## ff; \
+ \
+ biquad_process_## name(apc, ap, dst, asrc, nb_samples); \
+ } \
+ \
+ for (int f = first_order; f < s->ap_filter_count; f++) { \
+ const type *asrc = (const type *)frames[band]->extended_data[ch]; \
+ type *dst = (type *)frames[band]->extended_data[ch]; \
+ type *ap = xover + nb_outs * 40 + (aband * nb_outs + band) * 20 + f * 2;\
+ const type *const apc = (type *)&s->ap[aband][f].c ## ff; \
+ \
+ biquad_process_## name(apc, ap, dst, asrc, nb_samples); \
+ } \
+ } \
+ } \
+ \
+ for (int band = 0; band < nb_outs; band++) { \
+ const type gain = s->gains[band] * ((band & 1 && first_order) ? -one : one); \
+ type *dst = (type *)frames[band]->extended_data[ch]; \
+ \
+ s->fdsp->vector_## ff ##mul_scalar(dst, dst, gain, \
+ FFALIGN(nb_samples, sizeof(type))); \
+ } \
+ } \
+ \
+ return 0; \
+}
+
+XOVER_PROCESS(fltp, float, 1.f, f)
+XOVER_PROCESS(dblp, double, 1.0, d)
+
+static int config_input(AVFilterLink *inlink)
{
- double out = in * b->a0 + b->i1 * b->a1 + b->i2 * b->a2 - b->o1 * b->b1 - b->o2 * b->b2;
+ AVFilterContext *ctx = inlink->dst;
+ AudioCrossoverContext *s = ctx->priv;
+ int sample_rate = inlink->sample_rate;
+ double q[16];
+
+ s->order = (s->order_opt + 1) * 2;
+ s->filter_count = s->order / 2;
+ s->first_order = s->filter_count & 1;
+ s->ap_filter_count = s->filter_count / 2 + s->first_order;
+ calc_q_factors(s->order, q);
+
+ for (int band = 0; band <= s->nb_splits; band++) {
+ if (s->first_order) {
+ set_lp(&s->lp[band][0], s->splits[band], 0.5, sample_rate);
+ set_hp(&s->hp[band][0], s->splits[band], 0.5, sample_rate);
+ }
+
+ for (int n = s->first_order; n < s->filter_count; n++) {
+ const int idx = s->filter_count / 2 - ((n + s->first_order) / 2 - s->first_order) - 1;
+
+ set_lp(&s->lp[band][n], s->splits[band], q[idx], sample_rate);
+ set_hp(&s->hp[band][n], s->splits[band], q[idx], sample_rate);
+ }
+
+ if (s->first_order)
+ set_ap1(&s->ap[band][0], s->splits[band], sample_rate);
+
+ for (int n = s->first_order; n < s->ap_filter_count; n++) {
+ const int idx = (s->filter_count / 2 - ((n * 2 + s->first_order) / 2 - s->first_order) - 1);
+
+ set_ap(&s->ap[band][n], s->splits[band], q[idx], sample_rate);
+ }
+ }
+
+ switch (inlink->format) {
+ case AV_SAMPLE_FMT_FLTP: s->filter_channels = filter_channels_fltp; break;
+ case AV_SAMPLE_FMT_DBLP: s->filter_channels = filter_channels_dblp; break;
+ }
- b->i2 = b->i1;
- b->o2 = b->o1;
- b->i1 = in;
- b->o1 = out;
+ s->xover = ff_get_audio_buffer(inlink, 2 * (ctx->nb_outputs * 10 + ctx->nb_outputs * 10 +
+ ctx->nb_outputs * ctx->nb_outputs * 10));
+ if (!s->xover)
+ return AVERROR(ENOMEM);
- return out;
+ return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AudioCrossoverContext *s = ctx->priv;
- AVFrame *frames[MAX_BANDS] = { NULL };
- int i, f, ch, band, ret = 0;
+ AVFrame **frames = s->frames;
+ int i, ret = 0;
for (i = 0; i < ctx->nb_outputs; i++) {
frames[i] = ff_get_audio_buffer(ctx->outputs[i], in->nb_samples);
if (ret < 0)
goto fail;
- for (ch = 0; ch < inlink->channels; ch++) {
- const double *src = (const double *)in->extended_data[ch];
- CrossoverChannel *xover = &s->xover[ch];
-
- for (band = 0; band < ctx->nb_outputs; band++) {
- double *dst = (double *)frames[band]->extended_data[ch];
-
- for (i = 0; i < in->nb_samples; i++) {
- dst[i] = src[i];
-
- for (f = 0; f < s->filter_count; f++) {
- if (band + 1 < ctx->nb_outputs) {
- BiquadContext *lp = &xover->lp[band][f];
- dst[i] = biquad_process(lp, dst[i]);
- }
-
- if (band - 1 >= 0) {
- BiquadContext *hp = &xover->hp[band - 1][f];
- dst[i] = biquad_process(hp, dst[i]);
- }
- }
- }
- }
- }
+ s->input_frame = in;
+ ctx->internal->execute(ctx, s->filter_channels, NULL, NULL, FFMIN(inlink->channels,
+ ff_filter_get_nb_threads(ctx)));
for (i = 0; i < ctx->nb_outputs; i++) {
ret = ff_filter_frame(ctx->outputs[i], frames[i]);
+ frames[i] = NULL;
if (ret < 0)
break;
}
fail:
+ for (i = 0; i < ctx->nb_outputs; i++)
+ av_frame_free(&frames[i]);
av_frame_free(&in);
+ s->input_frame = NULL;
return ret;
}
AudioCrossoverContext *s = ctx->priv;
int i;
- av_freep(&s->splits);
+ av_freep(&s->fdsp);
+ av_frame_free(&s->xover);
for (i = 0; i < ctx->nb_outputs; i++)
av_freep(&ctx->output_pads[i].name);
{ NULL }
};
-AVFilter ff_af_acrossover = {
+const AVFilter ff_af_acrossover = {
.name = "acrossover",
.description = NULL_IF_CONFIG_SMALL("Split audio into per-bands streams."),
.priv_size = sizeof(AudioCrossoverContext),
.query_formats = query_formats,
.inputs = inputs,
.outputs = NULL,
- .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
+ .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS |
+ AVFILTER_FLAG_SLICE_THREADS,
};