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avfilter/avf_showspectrum: add legend support to showspectrum filter

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This commit is contained in:
Paul B Mahol 2018-10-07 12:10:59 +02:00
parent 0a41a8bf29
commit 9c120b4d42
2 changed files with 385 additions and 348 deletions
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3
doc/filters.texi
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@ -20730,6 +20730,9 @@ Set stop frequency to which to display spectrogram. Default is @code{0}.
@item fps
Set upper frame rate limit. Default is @code{auto}, unlimited.
@item legend
Draw time and frequency axes and legends. Default is disabled.
@end table
The usage is very similar to the showwaves filter; see the examples in that

730
libavfilter/avf_showspectrum.c
View File

@ -91,6 +91,7 @@ typedef struct ShowSpectrumContext {
AVAudioFifo *fifo;
int64_t pts;
int64_t old_pts;
int old_len;
int single_pic;
int legend;
int start_x, start_y;
@ -163,6 +164,7 @@ static const AVOption showspectrum_options[] = {
{ "start", "start frequency", OFFSET(start), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT32_MAX, FLAGS },
{ "stop", "stop frequency", OFFSET(stop), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT32_MAX, FLAGS },
{ "fps", "set video rate", OFFSET(rate_str), AV_OPT_TYPE_STRING, {.str = "auto"}, 0, 0, FLAGS },
{ "legend", "draw legend", OFFSET(legend), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
{ NULL }
};
@ -430,6 +432,346 @@ static int run_channel_fft(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
return 0;
}
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 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 COOL:
case GREEN:
case MAGMA:
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 + M_PI * s->rotation);
*vf *= 0.5 * cos((2 * M_PI * ch) / s->nb_display_channels + M_PI * s->rotation);
} else {
*uf *= 0.5 * sin(M_PI * s->rotation);
*vf *= 0.5 * cos(M_PI * s->rotation + M_PI_2);
}
} else {
*uf += *uf * sin(M_PI * s->rotation);
*vf += *vf * cos(M_PI * s->rotation + M_PI_2);
}
*uf *= s->saturation;
*vf *= s->saturation;
}
static void pick_color(ShowSpectrumContext *s,
float yf, float uf, float vf,
float a, float *out)
{
if (s->color_mode > CHANNEL) {
const int cm = s->color_mode;
float y, u, v;
int i;
for (i = 1; i < FF_ARRAY_ELEMS(color_table[cm]) - 1; i++)
if (color_table[cm][i].a >= a)
break;
// i now is the first item >= the color
// now we know to interpolate between item i - 1 and i
if (a <= color_table[cm][i - 1].a) {
y = color_table[cm][i - 1].y;
u = color_table[cm][i - 1].u;
v = color_table[cm][i - 1].v;
} else if (a >= color_table[cm][i].a) {
y = color_table[cm][i].y;
u = color_table[cm][i].u;
v = color_table[cm][i].v;
} else {
float start = color_table[cm][i - 1].a;
float end = color_table[cm][i].a;
float lerpfrac = (a - start) / (end - start);
y = color_table[cm][i - 1].y * (1.0f - lerpfrac)
+ color_table[cm][i].y * lerpfrac;
u = color_table[cm][i - 1].u * (1.0f - lerpfrac)
+ color_table[cm][i].u * lerpfrac;
v = color_table[cm][i - 1].v * (1.0f - lerpfrac)
+ color_table[cm][i].v * lerpfrac;
}
out[0] = y * yf;
out[1] = u * uf;
out[2] = v * vf;
} else {
out[0] = a * yf;
out[1] = a * uf;
out[2] = a * vf;
}
}
static char *get_time(AVFilterContext *ctx, float seconds, int x)
{
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);
return units;
}
static int draw_legend(AVFilterContext *ctx, int samples)
{
ShowSpectrumContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
int ch, y, x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;
int multi = (s->mode == SEPARATE && s->color_mode == CHANNEL);
float spp = samples / (float)sz;
char *text;
uint8_t *dst;
char chlayout_str[128];
av_get_channel_layout_string(chlayout_str, sizeof(chlayout_str), inlink->channels,
inlink->channel_layout);
text = av_asprintf("%d Hz | %s", inlink->sample_rate, chlayout_str);
drawtext(s->outpicref, 2, outlink->h - 10, "CREATED BY LIBAVFILTER", 0);
drawtext(s->outpicref, outlink->w - 2 - strlen(text) * 10, outlink->h - 10, text, 0);
if (s->stop) {
char *text = av_asprintf("Zoom: %d Hz - %d Hz", s->start, s->stop);
drawtext(s->outpicref, outlink->w - 2 - strlen(text) * 10, 3, text, 0);
av_freep(&text);
}
av_freep(&text);
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;
int hh = s->mode == SEPARATE ? -(s->h % s->nb_display_channels) + 1 : 1;
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 - hh) * 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 - hh) * 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 range = s->stop ? s->stop - s->start : inlink->sample_rate / 2;
float hertz = s->start + y * range / (float)(1 << (int)ceil(log2(h)));
char *units;
if (hertz == 0)
units = av_asprintf("DC");
else
units = av_asprintf("%.2f", hertz);
if (!units)
return AVERROR(ENOMEM);
drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, h * (ch + 1) + s->start_y - y - 4 - hh, units, 0);
av_free(units);
}
}
for (x = 0; x < s->w && s->single_pic; x+=80) {
float seconds = x * spp / inlink->sample_rate;
char *units = get_time(ctx, seconds, x);
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 - 79; x += 80) {
float range = s->stop ? s->stop - s->start : inlink->sample_rate / 2;
float hertz = s->start + x * range / (float)(1 << (int)ceil(log2(w)));
char *units;
if (hertz == 0)
units = av_asprintf("DC");
else
units = av_asprintf("%.2f", hertz);
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 && s->single_pic; y+=40) {
float seconds = y * spp / inlink->sample_rate;
char *units = get_time(ctx, seconds, x);
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;
float lout[3];
color_range(s, channel, &yf, &uf, &vf);
pick_color(s, yf, uf, vf, y / (float)h, lout);
out[0] += lout[0];
out[1] += lout[1];
out[2] += lout[2];
}
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);
}
for (y = 0; ch == 0 && y < h; y += h / 10) {
float value = 120.0 * log10(1. - y / (float)h);
char *text;
if (value < -120)
break;
text = av_asprintf("%.0f dB", value);
if (!text)
continue;
drawtext(s->outpicref, s->w + s->start_x + 35, s->start_y + y - 5, text, 0);
av_free(text);
}
}
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
@ -602,6 +944,9 @@ static int config_output(AVFilterLink *outlink)
memset(outpicref->data[2] + i * outpicref->linesize[2], 128, outlink->w);
}
outpicref->color_range = AVCOL_RANGE_JPEG;
if (!s->single_pic && s->legend)
draw_legend(ctx, 0);
}
if ((s->orientation == VERTICAL && s->xpos >= s->w) ||
@ -703,108 +1048,6 @@ 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 COOL:
case GREEN:
case MAGMA:
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 + M_PI * s->rotation);
*vf *= 0.5 * cos((2 * M_PI * ch) / s->nb_display_channels + M_PI * s->rotation);
} else {
*uf *= 0.5 * sin(M_PI * s->rotation);
*vf *= 0.5 * cos(M_PI * s->rotation + M_PI_2);
}
} else {
*uf += *uf * sin(M_PI * s->rotation);
*vf += *vf * cos(M_PI * s->rotation + M_PI_2);
}
*uf *= s->saturation;
*vf *= s->saturation;
}
static void pick_color(ShowSpectrumContext *s,
float yf, float uf, float vf,
float a, float *out)
{
if (s->color_mode > CHANNEL) {
const int cm = s->color_mode;
float y, u, v;
int i;
for (i = 1; i < FF_ARRAY_ELEMS(color_table[cm]) - 1; i++)
if (color_table[cm][i].a >= a)
break;
// i now is the first item >= the color
// now we know to interpolate between item i - 1 and i
if (a <= color_table[cm][i - 1].a) {
y = color_table[cm][i - 1].y;
u = color_table[cm][i - 1].u;
v = color_table[cm][i - 1].v;
} else if (a >= color_table[cm][i].a) {
y = color_table[cm][i].y;
u = color_table[cm][i].u;
v = color_table[cm][i].v;
} else {
float start = color_table[cm][i - 1].a;
float end = color_table[cm][i].a;
float lerpfrac = (a - start) / (end - start);
y = color_table[cm][i - 1].y * (1.0f - lerpfrac)
+ color_table[cm][i].y * lerpfrac;
u = color_table[cm][i - 1].u * (1.0f - lerpfrac)
+ color_table[cm][i].u * lerpfrac;
v = color_table[cm][i - 1].v * (1.0f - lerpfrac)
+ color_table[cm][i].v * lerpfrac;
}
out[0] = y * yf;
out[1] = u * uf;
out[2] = v * vf;
} else {
out[0] = a * yf;
out[1] = a * uf;
out[2] = a * vf;
}
}
static void clear_combine_buffer(ShowSpectrumContext *s, int size)
{
int y;
@ -904,8 +1147,8 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
if (s->sliding == SCROLL) {
for (plane = 0; plane < 3; plane++) {
for (y = 0; y < s->h; y++) {
uint8_t *p = outpicref->data[plane] +
y * outpicref->linesize[plane];
uint8_t *p = outpicref->data[plane] + s->start_x +
(y + s->start_y) * outpicref->linesize[plane];
memmove(p, p + 1, s->w - 1);
}
}
@ -913,8 +1156,8 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
} else if (s->sliding == RSCROLL) {
for (plane = 0; plane < 3; plane++) {
for (y = 0; y < s->h; y++) {
uint8_t *p = outpicref->data[plane] +
y * outpicref->linesize[plane];
uint8_t *p = outpicref->data[plane] + s->start_x +
(y + s->start_y) * outpicref->linesize[plane];
memmove(p + 1, p, s->w - 1);
}
}
@ -933,8 +1176,8 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
if (s->sliding == SCROLL) {
for (plane = 0; plane < 3; plane++) {
for (y = 1; y < s->h; y++) {
memmove(outpicref->data[plane] + (y-1) * outpicref->linesize[plane],
outpicref->data[plane] + (y ) * outpicref->linesize[plane],
memmove(outpicref->data[plane] + (y-1 + s->start_y) * outpicref->linesize[plane] + s->start_x,
outpicref->data[plane] + (y + s->start_y) * outpicref->linesize[plane] + s->start_x,
s->w);
}
}
@ -942,8 +1185,8 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
} else if (s->sliding == RSCROLL) {
for (plane = 0; plane < 3; plane++) {
for (y = s->h - 1; y >= 1; y--) {
memmove(outpicref->data[plane] + (y ) * outpicref->linesize[plane],
outpicref->data[plane] + (y-1) * outpicref->linesize[plane],
memmove(outpicref->data[plane] + (y + s->start_y) * outpicref->linesize[plane] + s->start_x,
outpicref->data[plane] + (y-1 + s->start_y) * outpicref->linesize[plane] + s->start_x,
s->w);
}
}
@ -969,6 +1212,31 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
s->xpos = 0;
if (!s->single_pic && (s->sliding != FULLFRAME || s->xpos == 0)) {
if (s->old_pts < outpicref->pts) {
if (s->legend) {
char *units = get_time(ctx, insamples->pts /(float)inlink->sample_rate, x);
if (s->orientation == VERTICAL) {
for (y = 0; y < 10; y++) {
memset(s->outpicref->data[0] + outlink->w / 2 - 4 * s->old_len +
(outlink->h - s->start_y / 2 - 20 + y) * s->outpicref->linesize[0], 0, 10 * s->old_len);
}
drawtext(s->outpicref,
outlink->w / 2 - 4 * strlen(units),
outlink->h - s->start_y / 2 - 20,
units, 0);
} else {
for (y = 0; y < 10 * s->old_len; y++) {
memset(s->outpicref->data[0] + s->start_x / 7 + 20 +
(outlink->h / 2 - 4 * s->old_len + y) * s->outpicref->linesize[0], 0, 10);
}
drawtext(s->outpicref,
s->start_x / 7 + 20,
outlink->h / 2 - 4 * strlen(units),
units, 1);
}
s->old_len = strlen(units);
av_free(units);
}
s->old_pts = outpicref->pts;
ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref));
if (ret < 0)
@ -1031,6 +1299,7 @@ static int activate(AVFilterContext *ctx)
ctx->internal->execute(ctx, calc_channel_phases, NULL, NULL, s->nb_display_channels);
ret = plot_spectrum_column(inlink, fin);
av_frame_free(&fin);
av_audio_fifo_drain(s->fifo, s->hop_size);
if (ret <= 0)
@ -1169,40 +1438,6 @@ static const AVOption showspectrumpic_options[] = {
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)
{
AVFilterContext *ctx = outlink->src;
@ -1214,7 +1449,7 @@ static int showspectrumpic_request_frame(AVFilterLink *outlink)
samples = av_audio_fifo_size(s->fifo);
if (ret == AVERROR_EOF && s->outpicref && samples > 0) {
int consumed = 0;
int y, x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;
int x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;
int ch, spf, spb;
AVFrame *fin;
@ -1262,209 +1497,8 @@ 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;
char *text;
uint8_t *dst;
char chlayout_str[128];
av_get_channel_layout_string(chlayout_str, sizeof(chlayout_str), inlink->channels,
inlink->channel_layout);
text = av_asprintf("%d Hz | %s", inlink->sample_rate, chlayout_str);
drawtext(s->outpicref, 2, outlink->h - 10, "CREATED BY LIBAVFILTER", 0);
drawtext(s->outpicref, outlink->w - 2 - strlen(text) * 10, outlink->h - 10, text, 0);
if (s->stop) {
char *text = av_asprintf("Zoom: %d Hz - %d Hz", s->start, s->stop);
drawtext(s->outpicref, outlink->w - 2 - strlen(text) * 10, 3, text, 0);
av_freep(&text);
}
av_freep(&text);
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;
int hh = s->mode == SEPARATE ? -(s->h % s->nb_display_channels) + 1 : 1;
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 - hh) * 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 - hh) * 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 range = s->stop ? s->stop - s->start : inlink->sample_rate / 2;
float hertz = s->start + y * range / (float)(1 << (int)ceil(log2(h)));
char *units;
if (hertz == 0)
units = av_asprintf("DC");
else
units = av_asprintf("%.2f", hertz);
if (!units)
return AVERROR(ENOMEM);
drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, h * (ch + 1) + s->start_y - y - 4 - hh, 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 - 79; x += 80) {
float range = s->stop ? s->stop - s->start : inlink->sample_rate / 2;
float hertz = s->start + x * range / (float)(1 << (int)ceil(log2(w)));
char *units;
if (hertz == 0)
units = av_asprintf("DC");
else
units = av_asprintf("%.2f", hertz);
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;
float lout[3];
color_range(s, channel, &yf, &uf, &vf);
pick_color(s, yf, uf, vf, y / (float)h, lout);
out[0] += lout[0];
out[1] += lout[1];
out[2] += lout[2];
}
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);
}
for (y = 0; ch == 0 && y < h; y += h / 10) {
float value = 120.0 * log10(1. - y / (float)h);
char *text;
if (value < -120)
break;
text = av_asprintf("%.0f dB", value);
if (!text)
continue;
drawtext(s->outpicref, s->w + s->start_x + 35, s->start_y + y - 5, text, 0);
av_free(text);
}
}
}
if (s->legend)
draw_legend(ctx, samples);
ret = ff_filter_frame(outlink, s->outpicref);
s->outpicref = NULL;