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avfilter/af_aiir: check for stability

This commit is contained in:
Paul B Mahol 2019-11-22 12:51:48 +01:00
parent 1b78da449e
commit c36e72ed27
1 changed files with 25 additions and 3 deletions
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28
libavfilter/af_aiir.c
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@ -596,9 +596,9 @@ static int decompose_zp2biquads(AVFilterContext *ctx, int channels)
iir->biquads[current_biquad].a0 = 1.0;
iir->biquads[current_biquad].a1 = a[2] / a[4];
iir->biquads[current_biquad].a2 = a[0] / a[4];
iir->biquads[current_biquad].b0 = b[4] / a[4] * (current_biquad ? 1.0 : iir->g);
iir->biquads[current_biquad].b1 = b[2] / a[4] * (current_biquad ? 1.0 : iir->g);
iir->biquads[current_biquad].b2 = b[0] / a[4] * (current_biquad ? 1.0 : iir->g);
iir->biquads[current_biquad].b0 = (b[4] / a[4]) * (current_biquad ? 1.0 : iir->g);
iir->biquads[current_biquad].b1 = (b[2] / a[4]) * (current_biquad ? 1.0 : iir->g);
iir->biquads[current_biquad].b2 = (b[0] / a[4]) * (current_biquad ? 1.0 : iir->g);
av_log(ctx, AV_LOG_VERBOSE, "a=%f %f %f:b=%f %f %f\n",
iir->biquads[current_biquad].a0,
@ -669,6 +669,25 @@ static void convert_pd2zp(AVFilterContext *ctx, int channels)
}
}
static void check_stability(AVFilterContext *ctx, int channels)
{
AudioIIRContext *s = ctx->priv;
int ch;
for (ch = 0; ch < channels; ch++) {
IIRChannel *iir = &s->iir[ch];
for (int n = 0; n < iir->nb_ab[0]; n++) {
double pr = hypot(iir->ab[0][2*n], iir->ab[0][2*n+1]);
if (pr >= 1.) {
av_log(ctx, AV_LOG_WARNING, "pole %d at channel %d is unstable\n", n, ch);
break;
}
}
}
}
static void drawtext(AVFrame *pic, int x, int y, const char *txt, uint32_t color)
{
const uint8_t *font;
@ -885,6 +904,9 @@ static int config_output(AVFilterLink *outlink)
} else if (s->format == 3) {
convert_pd2zp(ctx, inlink->channels);
}
if (s->format > 0) {
check_stability(ctx, inlink->channels);
}
av_frame_free(&s->video);
if (s->response) {