Message ID | b5136dca3656a192e71a7575ecac460536fc5b56.camel@t-online.de |
---|---|
State | New |
Headers | show |
Series | [FFmpeg-devel] avfilter: allow floating point formatting in expr_int_format (vf_drawtext.c) | expand |
Context | Check | Description |
---|---|---|
andriy/make_x86 | success | Make finished |
andriy/make_fate_x86 | success | Make fate finished |
On date Saturday 2023-12-02 15:54:34 +0100, Lennart Klebl wrote: > Since I was trying for quite some time to get proper floating point > formatting of positive and negative numbers working with the existing > drawtext/expr_int_format implementation, I added the f format specifier > that is only applied when used in conjunction with a width. > > > From 14c438a2bcf2ea17a6818ef5cdc6a7ee9ef30184 Mon Sep 17 00:00:00 2001 > From: "lennart.klebl@t-online.de" <lennart.klebl@t-online.de> > Date: Sat, 2 Dec 2023 15:53:20 +0100 > Subject: [PATCH] avfilter: allow floating point formatting in expr_int_format > (vf_drawtext.c) > > --- > doc/filters.texi | 12 ++++++++---- > libavfilter/vf_drawtext.c | 19 ++++++++++++++----- > 2 files changed, 22 insertions(+), 9 deletions(-) > > diff --git a/doc/filters.texi b/doc/filters.texi > index de19d130cc..1b11124434 100644 > --- a/doc/filters.texi > +++ b/doc/filters.texi > @@ -12807,14 +12807,18 @@ the constants @var{text_w} and @var{text_h} will have an undefined > value. > > @item expr_int_format, eif > -Evaluate the expression's value and output as formatted integer. > +Evaluate the expression's value and output as formatted integer or floating > +point number. > > The first argument is the expression to be evaluated, just as for the @var{expr} function. > The second argument specifies the output format. Allowed values are @samp{x}, > -@samp{X}, @samp{d} and @samp{u}. They are treated exactly as in the > +@samp{X}, @samp{d}, @samp{u}, and @samp{f}. They are treated exactly as in the > @code{printf} function. > -The third parameter is optional and sets the number of positions taken by the output. > -It can be used to add padding with zeros from the left. > + > +When specifying @samp{f}, the third parameter is required and specifies the > +number of decimal places for floating point formatting. Otherwise, the third I think we want to use a sane default when not specified, in this case you can skip the specification of .N. > +parameter is optional and sets the number of positions taken by the output. It > +can be used to add padding with zeros from the left. > > @item gmtime > The time at which the filter is running, expressed in UTC. > diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c > index c5477cbff1..be0490bbb3 100644 > --- a/libavfilter/vf_drawtext.c > +++ b/libavfilter/vf_drawtext.c > @@ -1359,6 +1359,7 @@ static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp, > int ret; > unsigned int positions = 0; > char fmt_str[30] = "%"; > + char fmt_arg = argv[1][0]; > > /* > * argv[0] expression to be converted to `int` > @@ -1376,9 +1377,9 @@ static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp, > return ret; > } > > - if (!strchr("xXdu", argv[1][0])) { > + if (!strchr("xXduf", fmt_arg)) { > av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified," > - " allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]); > + " allowed values: 'x', 'X', 'd', 'u', 'f'\n", fmt_arg); > return AVERROR(EINVAL); > } > > @@ -1400,14 +1401,22 @@ static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp, > } > #endif > > + if (fmt_arg == 'f' && argc < 3) fmt_arg = 'd'; > + We should avoid this unexpected fallback, just skip the .N specification in this case. > if (argc == 3) > - av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions); > - av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]); > + if (fmt_arg == 'f') > + av_strlcatf(fmt_str, sizeof(fmt_str), ".%u", positions); > + else > + av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions); > + av_strlcatf(fmt_str, sizeof(fmt_str), "%c", fmt_arg);
From 14c438a2bcf2ea17a6818ef5cdc6a7ee9ef30184 Mon Sep 17 00:00:00 2001 From: "lennart.klebl@t-online.de" <lennart.klebl@t-online.de> Date: Sat, 2 Dec 2023 15:53:20 +0100 Subject: [PATCH] avfilter: allow floating point formatting in expr_int_format (vf_drawtext.c) --- doc/filters.texi | 12 ++++++++---- libavfilter/vf_drawtext.c | 19 ++++++++++++++----- 2 files changed, 22 insertions(+), 9 deletions(-) diff --git a/doc/filters.texi b/doc/filters.texi index de19d130cc..1b11124434 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -12807,14 +12807,18 @@ the constants @var{text_w} and @var{text_h} will have an undefined value. @item expr_int_format, eif -Evaluate the expression's value and output as formatted integer. +Evaluate the expression's value and output as formatted integer or floating +point number. The first argument is the expression to be evaluated, just as for the @var{expr} function. The second argument specifies the output format. Allowed values are @samp{x}, -@samp{X}, @samp{d} and @samp{u}. They are treated exactly as in the +@samp{X}, @samp{d}, @samp{u}, and @samp{f}. They are treated exactly as in the @code{printf} function. -The third parameter is optional and sets the number of positions taken by the output. -It can be used to add padding with zeros from the left. + +When specifying @samp{f}, the third parameter is required and specifies the +number of decimal places for floating point formatting. Otherwise, the third +parameter is optional and sets the number of positions taken by the output. It +can be used to add padding with zeros from the left. @item gmtime The time at which the filter is running, expressed in UTC. diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c index c5477cbff1..be0490bbb3 100644 --- a/libavfilter/vf_drawtext.c +++ b/libavfilter/vf_drawtext.c @@ -1359,6 +1359,7 @@ static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp, int ret; unsigned int positions = 0; char fmt_str[30] = "%"; + char fmt_arg = argv[1][0]; /* * argv[0] expression to be converted to `int` @@ -1376,9 +1377,9 @@ static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp, return ret; } - if (!strchr("xXdu", argv[1][0])) { + if (!strchr("xXduf", fmt_arg)) { av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified," - " allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]); + " allowed values: 'x', 'X', 'd', 'u', 'f'\n", fmt_arg); return AVERROR(EINVAL); } @@ -1400,14 +1401,22 @@ static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp, } #endif + if (fmt_arg == 'f' && argc < 3) fmt_arg = 'd'; + if (argc == 3) - av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions); - av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]); + if (fmt_arg == 'f') + av_strlcatf(fmt_str, sizeof(fmt_str), ".%u", positions); + else + av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions); + av_strlcatf(fmt_str, sizeof(fmt_str), "%c", fmt_arg); av_log(ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n", res, argv[0], fmt_str); - av_bprintf(bp, fmt_str, intval); + if (fmt_arg == 'f') + av_bprintf(bp, fmt_str, res); + else + av_bprintf(bp, fmt_str, intval); return 0; } -- 2.43.0