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avfilter/showcqt: add font option

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this is fontconfig pattern

Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
This commit is contained in:
Muhammad Faiz 2016-10-17 05:59:57 +07:00
parent 92de89d14a
commit 923488bdaa
3 changed files with 89 additions and 7 deletions
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10
doc/filters.texi
View File

@ -16870,6 +16870,10 @@ use embedded font. Note that drawing with font file or embedded font is not
implemented with custom @var{basefreq} and @var{endfreq}, use @var{axisfile}
option instead.
@item font
Specify fontconfig pattern. This has lower priority than @var{fontfile}.
The : in the pattern may be replaced by | to avoid unnecessary escaping.
@item fontcolor
Specify font color expression. This is arithmetic expression that should return
integer value 0xRRGGBB. It can contain variables:
@ -16992,6 +16996,12 @@ Custom fontcolor and fontfile, C-note is colored green, others are colored blue:
fontcolor='if(mod(floor(midi(f)+0.5),12), 0x0000FF, g(1))':fontfile=myfont.ttf
@end example
@item
Custom font using fontconfig:
@example
font='Courier New,Monospace,mono|bold'
@end example
@item
Custom frequency range with custom axis using image file:
@example

85
libavfilter/avf_showcqt.c
View File

@ -36,6 +36,10 @@
#include FT_FREETYPE_H
#endif
#if CONFIG_LIBFONTCONFIG
#include <fontconfig/fontconfig.h>
#endif
#include "avf_showcqt.h"
#define BASEFREQ 20.01523126408007475
@ -78,7 +82,8 @@ static const AVOption showcqt_options[] = {
{ "tlength", "set tlength", OFFSET(tlength), AV_OPT_TYPE_STRING, { .str = TLENGTH }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "count", "set transform count", OFFSET(count), AV_OPT_TYPE_INT, { .i64 = 6 }, 1, 30, FLAGS },
{ "fcount", "set frequency count", OFFSET(fcount), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 10, FLAGS },
{ "fontfile", "set axis font", OFFSET(fontfile), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "fontfile", "set axis font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "font", "set axis font", OFFSET(font), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "fontcolor", "set font color", OFFSET(fontcolor), AV_OPT_TYPE_STRING, { .str = FONTCOLOR }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "axisfile", "set axis image", OFFSET(axisfile), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "axis", "draw axis", OFFSET(axis), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
@ -492,7 +497,7 @@ static int init_axis_color(ShowCQTContext *s, AVFrame *tmp, int half)
return 0;
}
static int render_freetype(ShowCQTContext *s, AVFrame *tmp)
static int render_freetype(ShowCQTContext *s, AVFrame *tmp, char *fontfile)
{
#if CONFIG_LIBFREETYPE
const char *str = "EF G A BC D ";
@ -506,13 +511,13 @@ static int render_freetype(ShowCQTContext *s, AVFrame *tmp)
int non_monospace_warning = 0;
int x;
if (!s->fontfile)
if (!fontfile)
return AVERROR(EINVAL);
if (FT_Init_FreeType(&lib))
goto fail;
if (FT_New_Face(lib, s->fontfile, 0, &face))
if (FT_New_Face(lib, fontfile, 0, &face))
goto fail;
if (FT_Set_Char_Size(face, 16*64, 0, 0, 0))
@ -565,17 +570,81 @@ static int render_freetype(ShowCQTContext *s, AVFrame *tmp)
return 0;
fail:
av_log(s->ctx, AV_LOG_WARNING, "error while loading freetype font, using default font instead.\n");
av_log(s->ctx, AV_LOG_WARNING, "error while loading freetype font.\n");
FT_Done_Face(face);
FT_Done_FreeType(lib);
return AVERROR(EINVAL);
#else
if (s->fontfile)
if (fontfile)
av_log(s->ctx, AV_LOG_WARNING, "freetype is not available, ignoring fontfile option.\n");
return AVERROR(EINVAL);
#endif
}
static int render_fontconfig(ShowCQTContext *s, AVFrame *tmp, char* font)
{
#if CONFIG_LIBFONTCONFIG
FcConfig *fontconfig;
FcPattern *pat, *best;
FcResult result = FcResultMatch;
char *filename;
int i, ret;
if (!font)
return AVERROR(EINVAL);
for (i = 0; font[i]; i++) {
if (font[i] == '|')
font[i] = ':';
}
if (!(fontconfig = FcInitLoadConfigAndFonts())) {
av_log(s->ctx, AV_LOG_ERROR, "impossible to init fontconfig.\n");
return AVERROR_UNKNOWN;
}
if (!(pat = FcNameParse((uint8_t *)font))) {
av_log(s->ctx, AV_LOG_ERROR, "could not parse fontconfig pat.\n");
FcConfigDestroy(fontconfig);
return AVERROR(EINVAL);
}
FcDefaultSubstitute(pat);
if (!FcConfigSubstitute(fontconfig, pat, FcMatchPattern)) {
av_log(s->ctx, AV_LOG_ERROR, "could not substitue fontconfig options.\n");
FcPatternDestroy(pat);
FcConfigDestroy(fontconfig);
return AVERROR(ENOMEM);
}
best = FcFontMatch(fontconfig, pat, &result);
FcPatternDestroy(pat);
ret = AVERROR(EINVAL);
if (!best || result != FcResultMatch) {
av_log(s->ctx, AV_LOG_ERROR, "cannot find a valid font for %s.\n", font);
goto fail;
}
if (FcPatternGetString(best, FC_FILE, 0, (FcChar8 **)&filename) != FcResultMatch) {
av_log(s->ctx, AV_LOG_ERROR, "no file path for %s\n", font);
goto fail;
}
ret = render_freetype(s, tmp, filename);
fail:
FcPatternDestroy(best);
FcConfigDestroy(fontconfig);
return ret;
#else
if (font)
av_log(s->ctx, AV_LOG_WARNING, "fontconfig is not available, ignoring font option.\n");
return AVERROR(EINVAL);
#endif
}
static int render_default_font(AVFrame *tmp)
{
const char *str = "EF G A BC D ";
@ -615,7 +684,9 @@ static int init_axis_from_font(ShowCQTContext *s)
if (!(s->axis_frame = av_frame_alloc()))
goto fail;
if (render_freetype(s, tmp) < 0 && (default_font = 1, ret = render_default_font(tmp)) < 0)
if (render_freetype(s, tmp, s->fontfile) < 0 &&
render_fontconfig(s, tmp, s->font) < 0 &&
(default_font = 1, ret = render_default_font(tmp)) < 0)
goto fail;
if (default_font)

1
libavfilter/avf_showcqt.h
View File

@ -109,6 +109,7 @@ typedef struct {
int count;
int fcount;
char *fontfile;
char *font;
char *fontcolor;
char *axisfile;
int axis;