NB_WFUNC
};
+enum Scale {
+ SCALE_LINLIN,
+ SCALE_LINLOG,
+ SCALE_LOGLIN,
+ SCALE_LOGLOG,
+ NB_SCALE
+};
+
#define NB_GAIN_ENTRY_MAX 4096
typedef struct {
double freq;
typedef struct {
const AVClass *class;
+ RDFTContext *analysis_rdft;
RDFTContext *analysis_irdft;
RDFTContext *rdft;
RDFTContext *irdft;
int rdft_len;
float *analysis_buf;
+ float *dump_buf;
float *kernel_tmp_buf;
float *kernel_buf;
float *conv_buf;
int fixed;
int multi;
int zero_phase;
+ int scale;
+ char *dumpfile;
+ int dumpscale;
int nb_gain_entry;
int gain_entry_err;
{ "fixed", "set fixed frame samples", OFFSET(fixed), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "multi", "set multi channels mode", OFFSET(multi), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "zero_phase", "set zero phase mode", OFFSET(zero_phase), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
+ { "scale", "set gain scale", OFFSET(scale), AV_OPT_TYPE_INT, { .i64 = SCALE_LINLOG }, 0, NB_SCALE-1, FLAGS, "scale" },
+ { "linlin", "linear-freq linear-gain", 0, AV_OPT_TYPE_CONST, { .i64 = SCALE_LINLIN }, 0, 0, FLAGS, "scale" },
+ { "linlog", "linear-freq logarithmic-gain", 0, AV_OPT_TYPE_CONST, { .i64 = SCALE_LINLOG }, 0, 0, FLAGS, "scale" },
+ { "loglin", "logarithmic-freq linear-gain", 0, AV_OPT_TYPE_CONST, { .i64 = SCALE_LOGLIN }, 0, 0, FLAGS, "scale" },
+ { "loglog", "logarithmic-freq logarithmic-gain", 0, AV_OPT_TYPE_CONST, { .i64 = SCALE_LOGLOG }, 0, 0, FLAGS, "scale" },
+ { "dumpfile", "set dump file", OFFSET(dumpfile), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
+ { "dumpscale", "set dump scale", OFFSET(dumpscale), AV_OPT_TYPE_INT, { .i64 = SCALE_LINLOG }, 0, NB_SCALE-1, FLAGS, "scale" },
{ NULL }
};
static void common_uninit(FIREqualizerContext *s)
{
+ av_rdft_end(s->analysis_rdft);
av_rdft_end(s->analysis_irdft);
av_rdft_end(s->rdft);
av_rdft_end(s->irdft);
- s->analysis_irdft = s->rdft = s->irdft = NULL;
+ s->analysis_rdft = s->analysis_irdft = s->rdft = s->irdft = NULL;
av_freep(&s->analysis_buf);
+ av_freep(&s->dump_buf);
av_freep(&s->kernel_tmp_buf);
av_freep(&s->kernel_buf);
av_freep(&s->conv_buf);
if (nsamples <= s->nsamples_max) {
float *buf = conv_buf + idx->buf_idx * s->rdft_len;
float *obuf = conv_buf + !idx->buf_idx * s->rdft_len + idx->overlap_idx;
+ int center = s->fir_len/2;
int k;
- memcpy(buf, data, nsamples * sizeof(*data));
- memset(buf + nsamples, 0, (s->rdft_len - nsamples) * sizeof(*data));
+ memset(buf, 0, center * sizeof(*data));
+ memcpy(buf + center, data, nsamples * sizeof(*data));
+ memset(buf + center + nsamples, 0, (s->rdft_len - nsamples - center) * sizeof(*data));
av_rdft_calc(s->rdft, buf);
buf[0] *= kernel_buf[0];
- buf[1] *= kernel_buf[1];
- for (k = 2; k < s->rdft_len; k += 2) {
- float re, im;
- re = buf[k] * kernel_buf[k] - buf[k+1] * kernel_buf[k+1];
- im = buf[k] * kernel_buf[k+1] + buf[k+1] * kernel_buf[k];
- buf[k] = re;
- buf[k+1] = im;
+ buf[1] *= kernel_buf[s->rdft_len/2];
+ for (k = 1; k < s->rdft_len/2; k++) {
+ buf[2*k] *= kernel_buf[k];
+ buf[2*k+1] *= kernel_buf[k];
}
av_rdft_calc(s->irdft, buf);
}
}
+static void dump_fir(AVFilterContext *ctx, FILE *fp, int ch)
+{
+ FIREqualizerContext *s = ctx->priv;
+ int rate = ctx->inputs[0]->sample_rate;
+ int xlog = s->dumpscale == SCALE_LOGLIN || s->dumpscale == SCALE_LOGLOG;
+ int ylog = s->dumpscale == SCALE_LINLOG || s->dumpscale == SCALE_LOGLOG;
+ int x;
+ int center = s->fir_len / 2;
+ double delay = s->zero_phase ? 0.0 : (double) center / rate;
+ double vx, ya, yb;
+
+ s->analysis_buf[0] *= s->rdft_len/2;
+ for (x = 1; x <= center; x++) {
+ s->analysis_buf[x] *= s->rdft_len/2;
+ s->analysis_buf[s->analysis_rdft_len - x] *= s->rdft_len/2;
+ }
+
+ if (ch)
+ fprintf(fp, "\n\n");
+
+ fprintf(fp, "# time[%d] (time amplitude)\n", ch);
+
+ for (x = center; x > 0; x--)
+ fprintf(fp, "%15.10f %15.10f\n", delay - (double) x / rate, (double) s->analysis_buf[s->analysis_rdft_len - x]);
+
+ for (x = 0; x <= center; x++)
+ fprintf(fp, "%15.10f %15.10f\n", delay + (double)x / rate , (double) s->analysis_buf[x]);
+
+ av_rdft_calc(s->analysis_rdft, s->analysis_buf);
+
+ fprintf(fp, "\n\n# freq[%d] (frequency desired_gain actual_gain)\n", ch);
+
+ for (x = 0; x <= s->analysis_rdft_len/2; x++) {
+ int i = (x == s->analysis_rdft_len/2) ? 1 : 2 * x;
+ vx = (double)x * rate / s->analysis_rdft_len;
+ if (xlog)
+ vx = log2(0.05*vx);
+ ya = s->dump_buf[i];
+ yb = s->analysis_buf[i];
+ if (ylog) {
+ ya = 20.0 * log10(fabs(ya));
+ yb = 20.0 * log10(fabs(yb));
+ }
+ fprintf(fp, "%17.10f %17.10f %17.10f\n", vx, ya, yb);
+ }
+}
+
static double entry_func(void *p, double freq, double gain)
{
AVFilterContext *ctx = p;
return res[0].gain;
}
+static double cubic_interpolate_func(void *p, double freq)
+{
+ AVFilterContext *ctx = p;
+ FIREqualizerContext *s = ctx->priv;
+ GainEntry *res;
+ double x, x2, x3;
+ double a, b, c, d;
+ double m0, m1, m2, msum, unit;
+
+ if (!s->nb_gain_entry)
+ return 0;
+
+ if (freq <= s->gain_entry_tbl[0].freq)
+ return s->gain_entry_tbl[0].gain;
+
+ if (freq >= s->gain_entry_tbl[s->nb_gain_entry-1].freq)
+ return s->gain_entry_tbl[s->nb_gain_entry-1].gain;
+
+ res = bsearch(&freq, &s->gain_entry_tbl, s->nb_gain_entry - 1, sizeof(*res), gain_entry_compare);
+ av_assert0(res);
+
+ unit = res[1].freq - res[0].freq;
+ m0 = res != s->gain_entry_tbl ?
+ unit * (res[0].gain - res[-1].gain) / (res[0].freq - res[-1].freq) : 0;
+ m1 = res[1].gain - res[0].gain;
+ m2 = res != s->gain_entry_tbl + s->nb_gain_entry - 2 ?
+ unit * (res[2].gain - res[1].gain) / (res[2].freq - res[1].freq) : 0;
+
+ msum = fabs(m0) + fabs(m1);
+ m0 = msum > 0 ? (fabs(m0) * m1 + fabs(m1) * m0) / msum : 0;
+ msum = fabs(m1) + fabs(m2);
+ m1 = msum > 0 ? (fabs(m1) * m2 + fabs(m2) * m1) / msum : 0;
+
+ d = res[0].gain;
+ c = m0;
+ b = 3 * res[1].gain - m1 - 2 * c - 3 * d;
+ a = res[1].gain - b - c - d;
+
+ x = (freq - res[0].freq) / unit;
+ x2 = x * x;
+ x3 = x2 * x;
+
+ return a * x3 + b * x2 + c * x + d;
+}
+
static const char *const var_names[] = {
"f",
"sr",
FIREqualizerContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
const char *gain_entry_func_names[] = { "entry", NULL };
- const char *gain_func_names[] = { "gain_interpolate", NULL };
+ const char *gain_func_names[] = { "gain_interpolate", "cubic_interpolate", NULL };
double (*gain_entry_funcs[])(void *, double, double) = { entry_func, NULL };
- double (*gain_funcs[])(void *, double) = { gain_interpolate_func, NULL };
+ double (*gain_funcs[])(void *, double) = { gain_interpolate_func, cubic_interpolate_func, NULL };
double vars[VAR_NB];
AVExpr *gain_expr;
int ret, k, center, ch;
+ int xlog = s->scale == SCALE_LOGLIN || s->scale == SCALE_LOGLOG;
+ int ylog = s->scale == SCALE_LINLOG || s->scale == SCALE_LOGLOG;
+ FILE *dump_fp = NULL;
s->nb_gain_entry = 0;
s->gain_entry_err = 0;
if (ret < 0)
return ret;
+ if (s->dumpfile && (!s->dump_buf || !s->analysis_rdft || !(dump_fp = fopen(s->dumpfile, "w"))))
+ av_log(ctx, AV_LOG_WARNING, "dumping failed.\n");
+
vars[VAR_CHS] = inlink->channels;
vars[VAR_CHLAYOUT] = inlink->channel_layout;
vars[VAR_SR] = inlink->sample_rate;
for (ch = 0; ch < inlink->channels; ch++) {
+ float *rdft_buf = s->kernel_tmp_buf + ch * s->rdft_len;
+ double result;
vars[VAR_CH] = ch;
vars[VAR_CHID] = av_channel_layout_extract_channel(inlink->channel_layout, ch);
vars[VAR_F] = 0.0;
- s->analysis_buf[0] = pow(10.0, 0.05 * av_expr_eval(gain_expr, vars, ctx));
+ if (xlog)
+ vars[VAR_F] = log2(0.05 * vars[VAR_F]);
+ result = av_expr_eval(gain_expr, vars, ctx);
+ s->analysis_buf[0] = ylog ? pow(10.0, 0.05 * result) : result;
+
vars[VAR_F] = 0.5 * inlink->sample_rate;
- s->analysis_buf[1] = pow(10.0, 0.05 * av_expr_eval(gain_expr, vars, ctx));
+ if (xlog)
+ vars[VAR_F] = log2(0.05 * vars[VAR_F]);
+ result = av_expr_eval(gain_expr, vars, ctx);
+ s->analysis_buf[1] = ylog ? pow(10.0, 0.05 * result) : result;
for (k = 1; k < s->analysis_rdft_len/2; k++) {
vars[VAR_F] = k * ((double)inlink->sample_rate /(double)s->analysis_rdft_len);
- s->analysis_buf[2*k] = pow(10.0, 0.05 * av_expr_eval(gain_expr, vars, ctx));
+ if (xlog)
+ vars[VAR_F] = log2(0.05 * vars[VAR_F]);
+ result = av_expr_eval(gain_expr, vars, ctx);
+ s->analysis_buf[2*k] = ylog ? pow(10.0, 0.05 * result) : result;
s->analysis_buf[2*k+1] = 0.0;
}
+ if (s->dump_buf)
+ memcpy(s->dump_buf, s->analysis_buf, s->analysis_rdft_len * sizeof(*s->analysis_buf));
+
av_rdft_calc(s->analysis_irdft, s->analysis_buf);
center = s->fir_len / 2;
av_assert0(0);
}
s->analysis_buf[k] *= (2.0/s->analysis_rdft_len) * (2.0/s->rdft_len) * win;
+ if (k)
+ s->analysis_buf[s->analysis_rdft_len - k] = s->analysis_buf[k];
}
- for (k = 0; k < center - k; k++) {
- float tmp = s->analysis_buf[k];
- s->analysis_buf[k] = s->analysis_buf[center - k];
- s->analysis_buf[center - k] = tmp;
- }
-
- for (k = 1; k <= center; k++)
- s->analysis_buf[center + k] = s->analysis_buf[center - k];
-
- memset(s->analysis_buf + s->fir_len, 0, (s->rdft_len - s->fir_len) * sizeof(*s->analysis_buf));
- av_rdft_calc(s->rdft, s->analysis_buf);
+ memset(s->analysis_buf + center + 1, 0, (s->analysis_rdft_len - s->fir_len) * sizeof(*s->analysis_buf));
+ memcpy(rdft_buf, s->analysis_buf, s->rdft_len/2 * sizeof(*s->analysis_buf));
+ memcpy(rdft_buf + s->rdft_len/2, s->analysis_buf + s->analysis_rdft_len - s->rdft_len/2, s->rdft_len/2 * sizeof(*s->analysis_buf));
+ av_rdft_calc(s->rdft, rdft_buf);
for (k = 0; k < s->rdft_len; k++) {
- if (isnan(s->analysis_buf[k]) || isinf(s->analysis_buf[k])) {
+ if (isnan(rdft_buf[k]) || isinf(rdft_buf[k])) {
av_log(ctx, AV_LOG_ERROR, "filter kernel contains nan or infinity.\n");
av_expr_free(gain_expr);
+ if (dump_fp)
+ fclose(dump_fp);
return AVERROR(EINVAL);
}
}
- memcpy(s->kernel_tmp_buf + ch * s->rdft_len, s->analysis_buf, s->rdft_len * sizeof(*s->analysis_buf));
+ rdft_buf[s->rdft_len-1] = rdft_buf[1];
+ for (k = 0; k < s->rdft_len/2; k++)
+ rdft_buf[k] = rdft_buf[2*k];
+ rdft_buf[s->rdft_len/2] = rdft_buf[s->rdft_len-1];
+
+ if (dump_fp)
+ dump_fir(ctx, dump_fp, ch);
+
if (!s->multi)
break;
}
memcpy(s->kernel_buf, s->kernel_tmp_buf, (s->multi ? inlink->channels : 1) * s->rdft_len * sizeof(*s->kernel_buf));
av_expr_free(gain_expr);
+ if (dump_fp)
+ fclose(dump_fp);
return 0;
}
+#define SELECT_GAIN(s) (s->gain_cmd ? s->gain_cmd : s->gain)
+#define SELECT_GAIN_ENTRY(s) (s->gain_entry_cmd ? s->gain_entry_cmd : s->gain_entry)
+
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
if (!(s->analysis_irdft = av_rdft_init(rdft_bits, IDFT_C2R)))
return AVERROR(ENOMEM);
+ if (s->dumpfile) {
+ s->analysis_rdft = av_rdft_init(rdft_bits, DFT_R2C);
+ s->dump_buf = av_malloc_array(s->analysis_rdft_len, sizeof(*s->dump_buf));
+ }
+
s->analysis_buf = av_malloc_array(s->analysis_rdft_len, sizeof(*s->analysis_buf));
s->kernel_tmp_buf = av_malloc_array(s->rdft_len * (s->multi ? inlink->channels : 1), sizeof(*s->kernel_tmp_buf));
s->kernel_buf = av_malloc_array(s->rdft_len * (s->multi ? inlink->channels : 1), sizeof(*s->kernel_buf));
if (s->fixed)
inlink->min_samples = inlink->max_samples = inlink->partial_buf_size = s->nsamples_max;
- return generate_kernel(ctx, s->gain_cmd ? s->gain_cmd : s->gain,
- s->gain_entry_cmd ? s->gain_entry_cmd : s->gain_entry);
+ return generate_kernel(ctx, SELECT_GAIN(s), SELECT_GAIN_ENTRY(s));
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
if (!strcmp(cmd, "gain")) {
char *gain_cmd;
+ if (SELECT_GAIN(s) && !strcmp(SELECT_GAIN(s), args)) {
+ av_log(ctx, AV_LOG_DEBUG, "equal gain, do not rebuild.\n");
+ return 0;
+ }
+
gain_cmd = av_strdup(args);
if (!gain_cmd)
return AVERROR(ENOMEM);
- ret = generate_kernel(ctx, gain_cmd, s->gain_entry_cmd ? s->gain_entry_cmd : s->gain_entry);
+ ret = generate_kernel(ctx, gain_cmd, SELECT_GAIN_ENTRY(s));
if (ret >= 0) {
av_freep(&s->gain_cmd);
s->gain_cmd = gain_cmd;
} else if (!strcmp(cmd, "gain_entry")) {
char *gain_entry_cmd;
+ if (SELECT_GAIN_ENTRY(s) && !strcmp(SELECT_GAIN_ENTRY(s), args)) {
+ av_log(ctx, AV_LOG_DEBUG, "equal gain_entry, do not rebuild.\n");
+ return 0;
+ }
+
gain_entry_cmd = av_strdup(args);
if (!gain_entry_cmd)
return AVERROR(ENOMEM);
- ret = generate_kernel(ctx, s->gain_cmd ? s->gain_cmd : s->gain, gain_entry_cmd);
+ ret = generate_kernel(ctx, SELECT_GAIN(s), gain_entry_cmd);
if (ret >= 0) {
av_freep(&s->gain_entry_cmd);
s->gain_entry_cmd = gain_entry_cmd;
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