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lavfi/showspectrum: add sliding mode.

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This commit is contained in:
Clément Bœsch
2012-10-21 21:01:18 +02:00
parent b19bfd6c9f
commit 13d26716fb
3 changed files with 17 additions and 5 deletions
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17
libavfilter/avf_showspectrum.c
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@@ -37,6 +37,7 @@ typedef struct {
int w, h;
AVFilterBufferRef *outpicref;
int req_fullfilled;
int sliding; ///< 1 if sliding mode, 0 otherwise
int xpos; ///< x position (current column)
RDFTContext *rdft; ///< Real Discrete Fourier Transform context
int rdft_bits; ///< number of bits (RDFT window size = 1<<rdft_bits)
@@ -52,6 +53,7 @@ typedef struct {
static const AVOption showspectrum_options[] = {
{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x480"}, 0, 0, FLAGS },
{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x480"}, 0, 0, FLAGS },
{ "slide", "set sliding mode", OFFSET(sliding), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS },
{ NULL },
};
@@ -247,16 +249,23 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFilterBufferRef *insampl
for (y = 0; y < outlink->h; y++) {
// FIXME: bin[0] contains first and last bins
const int pos = showspectrum->xpos * 3 + (outlink->h - y - 1) * outpicref->linesize[0];
uint8_t *p = outpicref->data[0] + (outlink->h - y - 1) * outpicref->linesize[0];
const double w = 1. / sqrt(nb_freq);
int a = sqrt(w * MAGNITUDE(RE(0), IM(0)));
int b = nb_display_channels > 1 ? sqrt(w * MAGNITUDE(RE(1), IM(1))) : a;
if (showspectrum->sliding) {
memmove(p, p + 3, (outlink->w - 1) * 3);
p += (outlink->w - 1) * 3;
} else {
p += showspectrum->xpos * 3;
}
a = FFMIN(a, 255);
b = FFMIN(b, 255);
outpicref->data[0][pos] = a;
outpicref->data[0][pos+1] = b;
outpicref->data[0][pos+2] = (a + b) / 2;
p[0] = a;
p[1] = b;
p[2] = (a + b) / 2;
}
outpicref->pts = insamples->pts +
av_rescale_q(showspectrum->consumed,