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avfilter/avf_showspectrum: add option to draw legend

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2016-01-02 23:01:25 +01:00
parent 7ab37cae34
commit 08aec7c1bd
2 changed files with 300 additions and 74 deletions
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4
doc/filters.texi
View File

@ -14827,6 +14827,7 @@ It accepts the following values:
@item nuttall
@item lanczos
@item gauss
@item tukey
@end table
Default value is @code{hann}.
@ -14837,6 +14838,9 @@ Set orientation of time vs frequency axis. Can be @code{vertical} or
@item gain
Set scale gain for calculating intensity color values.
Default value is @code{1}.
@item legend
Draw time and frequency axes and legends. Default is enabled.
@end table
@subsection Examples

370
libavfilter/avf_showspectrum.c
View File

@ -31,8 +31,10 @@
#include "libavcodec/avfft.h"
#include "libavutil/audio_fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "libavutil/xga_font_data.h"
#include "audio.h"
#include "video.h"
#include "avfilter.h"
@ -74,6 +76,8 @@ typedef struct {
AVAudioFifo *fifo;
int64_t pts;
int single_pic;
int legend;
int start_x, start_y;
} ShowSpectrumContext;
#define OFFSET(x) offsetof(ShowSpectrumContext, x)
@ -269,8 +273,15 @@ static int config_output(AVFilterLink *outlink)
outlink->w = s->w;
outlink->h = s->h;
h = (s->mode == COMBINED || s->orientation == HORIZONTAL) ? outlink->h : outlink->h / inlink->channels;
w = (s->mode == COMBINED || s->orientation == VERTICAL) ? outlink->w : outlink->w / inlink->channels;
if (s->legend) {
s->start_x = log10(inlink->sample_rate) * 25;
s->start_y = 64;
outlink->w += s->start_x * 2;
outlink->h += s->start_y * 2;
}
h = (s->mode == COMBINED || s->orientation == HORIZONTAL) ? s->h : s->h / inlink->channels;
w = (s->mode == COMBINED || s->orientation == VERTICAL) ? s->w : s->w / inlink->channels;
s->channel_height = h;
s->channel_width = w;
@ -356,23 +367,23 @@ static int config_output(AVFilterLink *outlink)
}
}
if ((s->orientation == VERTICAL && s->xpos >= outlink->w) ||
(s->orientation == HORIZONTAL && s->xpos >= outlink->h))
if ((s->orientation == VERTICAL && s->xpos >= s->w) ||
(s->orientation == HORIZONTAL && s->xpos >= s->h))
s->xpos = 0;
outlink->frame_rate = av_make_q(inlink->sample_rate, s->win_size * (1.-s->overlap));
if (s->orientation == VERTICAL && s->sliding == FULLFRAME)
outlink->frame_rate.den *= outlink->w;
outlink->frame_rate.den *= s->w;
if (s->orientation == HORIZONTAL && s->sliding == FULLFRAME)
outlink->frame_rate.den *= outlink->h;
outlink->frame_rate.den *= s->h;
if (s->orientation == VERTICAL) {
s->combine_buffer =
av_realloc_f(s->combine_buffer, outlink->h * 3,
av_realloc_f(s->combine_buffer, s->h * 3,
sizeof(*s->combine_buffer));
} else {
s->combine_buffer =
av_realloc_f(s->combine_buffer, outlink->w * 3,
av_realloc_f(s->combine_buffer, s->w * 3,
sizeof(*s->combine_buffer));
}
@ -447,6 +458,57 @@ static void scale_magnitudes(ShowSpectrumContext *s, float scale)
}
}
static void color_range(ShowSpectrumContext *s, int ch,
float *yf, float *uf, float *vf)
{
switch (s->mode) {
case COMBINED:
// reduce range by channel count
*yf = 256.0f / s->nb_display_channels;
switch (s->color_mode) {
case RAINBOW:
case MORELAND:
case NEBULAE:
case FIRE:
case FIERY:
case FRUIT:
case INTENSITY:
*uf = *yf;
*vf = *yf;
break;
case CHANNEL:
/* adjust saturation for mixed UV coloring */
/* this factor is correct for infinite channels, an approximation otherwise */
*uf = *yf * M_PI;
*vf = *yf * M_PI;
break;
default:
av_assert0(0);
}
break;
case SEPARATE:
// full range
*yf = 256.0f;
*uf = 256.0f;
*vf = 256.0f;
break;
default:
av_assert0(0);
}
if (s->color_mode == CHANNEL) {
if (s->nb_display_channels > 1) {
*uf *= 0.5 * sin((2 * M_PI * ch) / s->nb_display_channels);
*vf *= 0.5 * cos((2 * M_PI * ch) / s->nb_display_channels);
} else {
*uf = 0.0f;
*vf = 0.0f;
}
}
*uf *= s->saturation;
*vf *= s->saturation;
}
static void pick_color(ShowSpectrumContext *s,
float yf, float uf, float vf,
float a, float *out)
@ -517,59 +579,14 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
/* fill a new spectrum column */
/* initialize buffer for combining to black */
clear_combine_buffer(s, s->orientation == VERTICAL ? outlink->h : outlink->w);
clear_combine_buffer(s, s->orientation == VERTICAL ? s->h : s->w);
for (ch = 0; ch < s->nb_display_channels; ch++) {
float *magnitudes = s->magnitudes[ch];
float yf, uf, vf;
/* decide color range */
switch (s->mode) {
case COMBINED:
// reduce range by channel count
yf = 256.0f / s->nb_display_channels;
switch (s->color_mode) {
case RAINBOW:
case MORELAND:
case NEBULAE:
case FIRE:
case FIERY:
case FRUIT:
case INTENSITY:
uf = yf;
vf = yf;
break;
case CHANNEL:
/* adjust saturation for mixed UV coloring */
/* this factor is correct for infinite channels, an approximation otherwise */
uf = yf * M_PI;
vf = yf * M_PI;
break;
default:
av_assert0(0);
}
break;
case SEPARATE:
// full range
yf = 256.0f;
uf = 256.0f;
vf = 256.0f;
break;
default:
av_assert0(0);
}
if (s->color_mode == CHANNEL) {
if (s->nb_display_channels > 1) {
uf *= 0.5 * sin((2 * M_PI * ch) / s->nb_display_channels);
vf *= 0.5 * cos((2 * M_PI * ch) / s->nb_display_channels);
} else {
uf = 0.0f;
vf = 0.0f;
}
}
uf *= s->saturation;
vf *= s->saturation;
color_range(s, ch, &yf, &uf, &vf);
/* draw the channel */
for (y = 0; y < h; y++) {
@ -611,28 +628,28 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
if (s->orientation == VERTICAL) {
if (s->sliding == SCROLL) {
for (plane = 0; plane < 3; plane++) {
for (y = 0; y < outlink->h; y++) {
for (y = 0; y < s->h; y++) {
uint8_t *p = outpicref->data[plane] +
y * outpicref->linesize[plane];
memmove(p, p + 1, outlink->w - 1);
memmove(p, p + 1, s->w - 1);
}
}
s->xpos = outlink->w - 1;
s->xpos = s->w - 1;
} else if (s->sliding == RSCROLL) {
for (plane = 0; plane < 3; plane++) {
for (y = 0; y < outlink->h; y++) {
for (y = 0; y < s->h; y++) {
uint8_t *p = outpicref->data[plane] +
y * outpicref->linesize[plane];
memmove(p + 1, p, outlink->w - 1);
memmove(p + 1, p, s->w - 1);
}
}
s->xpos = 0;
}
for (plane = 0; plane < 3; plane++) {
uint8_t *p = outpicref->data[plane] +
(outlink->h - 1) * outpicref->linesize[plane] +
uint8_t *p = outpicref->data[plane] + s->start_x +
(outlink->h - 1 - s->start_y) * outpicref->linesize[plane] +
s->xpos;
for (y = 0; y < outlink->h; y++) {
for (y = 0; y < s->h; y++) {
*p = lrintf(av_clipf(s->combine_buffer[3 * y + plane], 0, 255));
p -= outpicref->linesize[plane];
}
@ -640,27 +657,27 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
} else {
if (s->sliding == SCROLL) {
for (plane = 0; plane < 3; plane++) {
for (y = 1; y < outlink->h; y++) {
for (y = 1; y < s->h; y++) {
memmove(outpicref->data[plane] + (y-1) * outpicref->linesize[plane],
outpicref->data[plane] + (y ) * outpicref->linesize[plane],
outlink->w);
s->w);
}
}
s->xpos = outlink->h - 1;
s->xpos = s->h - 1;
} else if (s->sliding == RSCROLL) {
for (plane = 0; plane < 3; plane++) {
for (y = outlink->h - 1; y >= 1; y--) {
for (y = s->h - 1; y >= 1; y--) {
memmove(outpicref->data[plane] + (y ) * outpicref->linesize[plane],
outpicref->data[plane] + (y-1) * outpicref->linesize[plane],
outlink->w);
s->w);
}
}
s->xpos = 0;
}
for (plane = 0; plane < 3; plane++) {
uint8_t *p = outpicref->data[plane] +
s->xpos * outpicref->linesize[plane];
for (x = 0; x < outlink->w; x++) {
uint8_t *p = outpicref->data[plane] + s->start_x +
(s->xpos + s->start_y) * outpicref->linesize[plane];
for (x = 0; x < s->w; x++) {
*p = lrintf(av_clipf(s->combine_buffer[3 * x + plane], 0, 255));
p++;
}
@ -671,9 +688,9 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
outpicref->pts = insamples->pts;
s->xpos++;
if (s->orientation == VERTICAL && s->xpos >= outlink->w)
if (s->orientation == VERTICAL && s->xpos >= s->w)
s->xpos = 0;
if (s->orientation == HORIZONTAL && s->xpos >= outlink->h)
if (s->orientation == HORIZONTAL && s->xpos >= s->h)
s->xpos = 0;
if (!s->single_pic && (s->sliding != FULLFRAME || s->xpos == 0)) {
ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref));
@ -832,11 +849,46 @@ static const AVOption showspectrumpic_options[] = {
{ "vertical", NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL}, 0, 0, FLAGS, "orientation" },
{ "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },
{ "gain", "set scale gain", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl = 1}, 0, 128, FLAGS },
{ "legend", "draw legend", OFFSET(legend), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(showspectrumpic);
static void drawtext(AVFrame *pic, int x, int y, const char *txt, int o)
{
const uint8_t *font;
int font_height;
int i;
font = avpriv_cga_font, font_height = 8;
for (i = 0; txt[i]; i++) {
int char_y, mask;
if (o) {
for (char_y = font_height - 1; char_y >= 0; char_y--) {
uint8_t *p = pic->data[0] + (y + i * 10) * pic->linesize[0] + x;
for (mask = 0x80; mask; mask >>= 1) {
if (font[txt[i] * font_height + font_height - 1 - char_y] & mask)
p[char_y] = ~p[char_y];
p += pic->linesize[0];
}
}
} else {
uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8);
for (char_y = 0; char_y < font_height; char_y++) {
for (mask = 0x80; mask; mask >>= 1) {
if (font[txt[i] * font_height + char_y] & mask)
*p = ~(*p);
p++;
}
p += pic->linesize[0] - 8;
}
}
}
}
static int showspectrumpic_request_frame(AVFilterLink *outlink)
{
ShowSpectrumContext *s = outlink->src->priv;
@ -847,7 +899,7 @@ static int showspectrumpic_request_frame(AVFilterLink *outlink)
if (ret == AVERROR_EOF && s->outpicref) {
int samples = av_audio_fifo_size(s->fifo);
int consumed = 0;
int x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;
int y, x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;
int ch, spf, spb;
AVFrame *fin;
@ -892,6 +944,176 @@ static int showspectrumpic_request_frame(AVFilterLink *outlink)
av_frame_free(&fin);
s->outpicref->pts = 0;
if (s->legend) {
int multi = (s->mode == SEPARATE && s->color_mode == CHANNEL);
float spp = samples / (float)sz;
uint8_t *dst;
drawtext(s->outpicref, 2, outlink->h - 10, "CREATED BY LIBAVFILTER", 0);
dst = s->outpicref->data[0] + (s->start_y - 1) * s->outpicref->linesize[0] + s->start_x - 1;
for (x = 0; x < s->w + 1; x++)
dst[x] = 200;
dst = s->outpicref->data[0] + (s->start_y + s->h) * s->outpicref->linesize[0] + s->start_x - 1;
for (x = 0; x < s->w + 1; x++)
dst[x] = 200;
for (y = 0; y < s->h + 2; y++) {
dst = s->outpicref->data[0] + (y + s->start_y - 1) * s->outpicref->linesize[0];
dst[s->start_x - 1] = 200;
dst[s->start_x + s->w] = 200;
}
if (s->orientation == VERTICAL) {
int h = s->mode == SEPARATE ? s->h / s->nb_display_channels : s->h;
for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {
for (y = 0; y < h; y += 20) {
dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[0];
dst[s->start_x - 2] = 200;
dst[s->start_x + s->w + 1] = 200;
}
for (y = 0; y < h; y += 40) {
dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[0];
dst[s->start_x - 3] = 200;
dst[s->start_x + s->w + 2] = 200;
}
dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x;
for (x = 0; x < s->w; x+=40)
dst[x] = 200;
dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x;
for (x = 0; x < s->w; x+=80)
dst[x] = 200;
dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x;
for (x = 0; x < s->w; x+=40) {
dst[x] = 200;
}
dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x;
for (x = 0; x < s->w; x+=80) {
dst[x] = 200;
}
for (y = 0; y < h; y += 40) {
float hz = y * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(h)));
char *units;
if (hz == 0)
units = av_asprintf("DC");
else
units = av_asprintf("%.2f", hz);
if (!units)
return AVERROR(ENOMEM);
drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, h * (ch + 1) + s->start_y - y - 4, units, 0);
av_free(units);
}
}
for (x = 0; x < s->w; x+=80) {
float seconds = x * spp / inlink->sample_rate;
char *units;
if (x == 0)
units = av_asprintf("0");
else if (log10(seconds) > 6)
units = av_asprintf("%.2fh", seconds / (60 * 60));
else if (log10(seconds) > 3)
units = av_asprintf("%.2fm", seconds / 60);
else
units = av_asprintf("%.2fs", seconds);
if (!units)
return AVERROR(ENOMEM);
drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->h + s->start_y + 6, units, 0);
drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->start_y - 12, units, 0);
av_free(units);
}
drawtext(s->outpicref, outlink->w / 2 - 4 * 4, outlink->h - s->start_y / 2, "TIME", 0);
drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 14 * 4, "FREQUENCY (Hz)", 1);
} else {
int w = s->mode == SEPARATE ? s->w / s->nb_display_channels : s->w;
for (y = 0; y < s->h; y += 20) {
dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];
dst[s->start_x - 2] = 200;
dst[s->start_x + s->w + 1] = 200;
}
for (y = 0; y < s->h; y += 40) {
dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];
dst[s->start_x - 3] = 200;
dst[s->start_x + s->w + 2] = 200;
}
for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {
dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x + w * ch;
for (x = 0; x < w; x+=40)
dst[x] = 200;
dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x + w * ch;
for (x = 0; x < w; x+=80)
dst[x] = 200;
dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x + w * ch;
for (x = 0; x < w; x+=40) {
dst[x] = 200;
}
dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x + w * ch;
for (x = 0; x < w; x+=80) {
dst[x] = 200;
}
for (x = 0; x < w; x += 80) {
float hz = x * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(w)));
char *units;
if (hz == 0)
units = av_asprintf("DC");
else
units = av_asprintf("%.2f", hz);
if (!units)
return AVERROR(ENOMEM);
drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->start_y - 12, units, 0);
drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->h + s->start_y + 6, units, 0);
av_free(units);
}
}
for (y = 0; y < s->h; y+=40) {
float seconds = y * spp / inlink->sample_rate;
char *units;
if (x == 0)
units = av_asprintf("0");
else if (log10(seconds) > 6)
units = av_asprintf("%.2fh", seconds / (60 * 60));
else if (log10(seconds) > 3)
units = av_asprintf("%.2fm", seconds / 60);
else
units = av_asprintf("%.2fs", seconds);
if (!units)
return AVERROR(ENOMEM);
drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, s->start_y + y - 4, units, 0);
av_free(units);
}
drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 4 * 4, "TIME", 1);
drawtext(s->outpicref, outlink->w / 2 - 14 * 4, outlink->h - s->start_y / 2, "FREQUENCY (Hz)", 0);
}
for (ch = 0; ch < (multi ? s->nb_display_channels : 1); ch++) {
int h = multi ? s->h / s->nb_display_channels : s->h;
for (y = 0; y < h; y++) {
float out[3] = { 0., 127.5, 127.5};
int chn;
for (chn = 0; chn < (s->mode == SEPARATE ? 1 : s->nb_display_channels); chn++) {
float yf, uf, vf;
int channel = (multi) ? s->nb_display_channels - ch - 1 : chn;
color_range(s, channel, &yf, &uf, &vf);
pick_color(s, yf, uf, vf, y / (float)h, out);
}
memset(s->outpicref->data[0]+(s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[0] + s->w + s->start_x + 20, av_clip_uint8(out[0]), 10);
memset(s->outpicref->data[1]+(s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[1] + s->w + s->start_x + 20, av_clip_uint8(out[1]), 10);
memset(s->outpicref->data[2]+(s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[2] + s->w + s->start_x + 20, av_clip_uint8(out[2]), 10);
}
}
}
ret = ff_filter_frame(outlink, s->outpicref);
s->outpicref = NULL;
}