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| author | Stefano Sabatini <stefasab@gmail.com> | 2012-11-27 11:27:12 +0100 |
|---|---|---|
| committer | Stefano Sabatini <stefasab@gmail.com> | 2012-11-27 23:27:50 +0100 |
| commit | 2ac6a3d1bfd0a165a3f15da6ed75c718e908f5f4 (patch) | |
| tree | 94f4185dcc9a15f18b72016769739c1a6356a335 /libavfilter/vf_drawtext.c | |
| parent | 2cfa6fd025f730d91f5904951dd4dbee5899c32a (diff) | |
lavfi/drawtext: add support to expansion of generic expressions
Diffstat (limited to 'libavfilter/vf_drawtext.c')
| -rw-r--r-- | libavfilter/vf_drawtext.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c index 96512ab390..509fbd22f5 100644 --- a/libavfilter/vf_drawtext.c +++ b/libavfilter/vf_drawtext.c @@ -643,12 +643,34 @@ static int func_strftime(AVFilterContext *ctx, AVBPrint *bp, return 0; } +static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp, + char *fct, unsigned argc, char **argv, int tag) +{ + DrawTextContext *dtext = ctx->priv; + double res; + int ret; + + ret = av_expr_parse_and_eval(&res, argv[0], var_names, dtext->var_values, + NULL, NULL, fun2_names, fun2, + &dtext->prng, 0, ctx); + if (ret < 0) + av_log(ctx, AV_LOG_ERROR, + "Expression '%s' for the expr text expansion function is not valid\n", + argv[0]); + else + av_bprintf(bp, "%f", res); + + return ret; +} + static const struct drawtext_function { const char *name; unsigned argc_min, argc_max; int tag; /** opaque argument to func */ int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int); } functions[] = { + { "expr", 1, 1, 0, func_eval_expr }, + { "e", 1, 1, 0, func_eval_expr }, { "pts", 0, 0, 0, func_pts }, { "gmtime", 0, 1, 'G', func_strftime }, { "localtime", 0, 1, 'L', func_strftime }, |