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avfilter/firequalizer: add scale option 

Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
This commit is contained in:
Muhammad Faiz 2016-10-17 03:17:50 +07:00
parent ad2d2ebd4e
commit 1a9513bfbc
2 changed files with 43 additions and 3 deletions
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13
doc/filters.texi
View File

@ -2563,6 +2563,19 @@ Enable multichannels evaluation on gain. Default is disabled.
@item zero_phase
Enable zero phase mode by subtracting timestamp to compensate delay.
Default is disabled.
@item scale
Set scale used by gain. Acceptable values are:
@table @option
@item linlin
linear frequency, linear gain
@item linlog
linear frequency, logarithmic (in dB) gain (default)
@item loglin
logarithmic (in octave scale where 20 Hz is 0) frequency, linear gain
@item loglog
logarithmic frequency, logarithmic gain
@end table
@end table
@subsection Examples

33
libavfilter/af_firequalizer.c
View File

@ -43,6 +43,14 @@ enum WindowFunc {
NB_WFUNC
};
enum Scale {
SCALE_LINLIN,
SCALE_LINLOG,
SCALE_LOGLIN,
SCALE_LOGLOG,
NB_SCALE
};
#define NB_GAIN_ENTRY_MAX 4096
typedef struct {
double freq;
@ -84,6 +92,7 @@ typedef struct {
int fixed;
int multi;
int zero_phase;
int scale;
int nb_gain_entry;
int gain_entry_err;
@ -112,6 +121,11 @@ static const AVOption firequalizer_options[] = {
{ "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" },
{ NULL }
};
@ -316,6 +330,8 @@ static int generate_kernel(AVFilterContext *ctx, const char *gain, const char *g
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;
s->nb_gain_entry = 0;
s->gain_entry_err = 0;
@ -340,16 +356,27 @@ static int generate_kernel(AVFilterContext *ctx, const char *gain, const char *g
vars[VAR_CHLAYOUT] = inlink->channel_layout;
vars[VAR_SR] = inlink->sample_rate;
for (ch = 0; ch < inlink->channels; ch++) {
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;
}