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avfilter/avf_showcwt: improve range detection for morlet scales

This commit is contained in:
Paul B Mahol 2023-07-30 19:57:50 +02:00
parent 48cd5561e1
commit 8bbaecb5de
1 changed files with 13 additions and 8 deletions
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21
libavfilter/avf_showcwt.c
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@ -152,7 +152,7 @@ static const AVOption showcwt_options[] = {
{ "min", "set minimum frequency", OFFSET(minimum_frequency), AV_OPT_TYPE_FLOAT, {.dbl = 20.}, 1, 192000, FLAGS },
{ "max", "set maximum frequency", OFFSET(maximum_frequency), AV_OPT_TYPE_FLOAT, {.dbl = 20000.}, 1, 192000, FLAGS },
{ "logb", "set logarithmic basis", OFFSET(logarithmic_basis), AV_OPT_TYPE_FLOAT, {.dbl = 0.0001}, 0, 1, FLAGS },
{ "deviation", "set frequency deviation", OFFSET(deviation), AV_OPT_TYPE_FLOAT, {.dbl = 1.}, 0, 10, FLAGS },
{ "deviation", "set frequency deviation", OFFSET(deviation), AV_OPT_TYPE_FLOAT, {.dbl = 1.}, 0, 100, FLAGS },
{ "pps", "set pixels per second", OFFSET(pps), AV_OPT_TYPE_INT, {.i64 = 64}, 1, 1024, FLAGS },
{ "mode", "set output mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 4, FLAGS, "mode" },
{ "magnitude", "magnitude", 0, AV_OPT_TYPE_CONST,{.i64=0}, 0, 0, FLAGS, "mode" },
@ -701,13 +701,13 @@ static int compute_kernel(AVFilterContext *ctx)
for (int y = 0; y < fsize; y++) {
AVComplexFloat *kernel = s->kernel[y];
int start = 0, stop = 0;
int start = INT_MIN, stop = INT_MAX;
const float frequency = s->frequency_band[y*2] * correction;
const float deviation = 1.f / (s->frequency_band[y*2+1] *
output_sample_count * correction);
const int range = 8.f*M_PI*sqrtf(1.f/deviation);
const int a = floorf(frequency-range);
const int b = ceilf(frequency+range);
const int a = FFMAX(frequency-12.f*sqrtf(1.f/deviation)-0.5f, -size);
const int b = FFMIN(frequency+12.f*sqrtf(1.f/deviation)-0.5f, size+a);
const int range = -a;
memset(tkernel, 0, size * sizeof(*tkernel));
for (int n = a; n < b; n++) {
@ -720,7 +720,7 @@ static int compute_kernel(AVFilterContext *ctx)
for (int n = a; n < b; n++) {
if (tkernel[n+range] != 0.f) {
if (tkernel[n+range] > FLT_MIN)
av_log(ctx, AV_LOG_DEBUG, "out of range kernel\n");
av_log(ctx, AV_LOG_DEBUG, "out of range kernel %g\n", tkernel[n+range]);
start = n;
break;
}
@ -729,16 +729,21 @@ static int compute_kernel(AVFilterContext *ctx)
for (int n = b; n >= a; n--) {
if (tkernel[n+range] != 0.f) {
if (tkernel[n+range] > FLT_MIN)
av_log(ctx, AV_LOG_DEBUG, "out of range kernel\n");
av_log(ctx, AV_LOG_DEBUG, "out of range kernel %g\n", tkernel[n+range]);
stop = n;
break;
}
}
if (start == INT_MIN || stop == INT_MAX) {
ret = AVERROR(EINVAL);
break;
}
kernel_start[y] = start;
kernel_stop[y] = stop;
kernel = av_calloc(FFALIGN(stop - start + 1+range, 16), sizeof(*kernel));
kernel = av_calloc(FFALIGN(stop-start+1, 16), sizeof(*kernel));
if (!kernel) {
ret = AVERROR(ENOMEM);
break;