#include "internal.h"
#include "video.h"
-#undef time
-
#include <ft2build.h>
#include <freetype/config/ftheader.h>
#include FT_FREETYPE_H
AVTimecode tc; ///< timecode context
int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
int frame_id;
+ int reload; ///< reload text file for each frame
} DrawTextContext;
#define OFFSET(x) offsetof(DrawTextContext, x)
{"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
{"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
{"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
+{"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
{"fix_bounds", "if true, check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
/* FT_LOAD_* flags */
return err;
}
+static int load_textfile(AVFilterContext *ctx)
+{
+ DrawTextContext *dtext = ctx->priv;
+ int err;
+ uint8_t *textbuf;
+ size_t textbuf_size;
+
+ if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
+ av_log(ctx, AV_LOG_ERROR,
+ "The text file '%s' could not be read or is empty\n",
+ dtext->textfile);
+ return err;
+ }
+
+ if (!(dtext->text = av_realloc(dtext->text, textbuf_size + 1)))
+ return AVERROR(ENOMEM);
+ memcpy(dtext->text, textbuf, textbuf_size);
+ dtext->text[textbuf_size] = 0;
+ av_file_unmap(textbuf, textbuf_size);
+
+ return 0;
+}
+
static av_cold int init(AVFilterContext *ctx, const char *args)
{
int err;
}
if (dtext->textfile) {
- uint8_t *textbuf;
- size_t textbuf_size;
-
if (dtext->text) {
av_log(ctx, AV_LOG_ERROR,
"Both text and text file provided. Please provide only one\n");
return AVERROR(EINVAL);
}
- if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
- av_log(ctx, AV_LOG_ERROR,
- "The text file '%s' could not be read or is empty\n",
- dtext->textfile);
+ if ((err = load_textfile(ctx)) < 0)
return err;
- }
-
- if (!(dtext->text = av_malloc(textbuf_size+1)))
- return AVERROR(ENOMEM);
- memcpy(dtext->text, textbuf, textbuf_size);
- dtext->text[textbuf_size] = 0;
- av_file_unmap(textbuf, textbuf_size);
}
+ if (dtext->reload && !dtext->textfile)
+ av_log(ctx, AV_LOG_WARNING, "No file to reload\n");
+
if (dtext->tc_opt_string) {
int ret = av_timecode_init_from_string(&dtext->tc, dtext->tc_rate,
dtext->tc_opt_string, ctx);
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 },
return 0;
}
-static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
-{
- return 0;
-}
-
-static int end_frame(AVFilterLink *inlink)
+static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
DrawTextContext *dtext = ctx->priv;
- AVFilterBufferRef *picref = inlink->cur_buf;
int ret;
- dtext->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?
- NAN : picref->pts * av_q2d(inlink->time_base);
+ if (dtext->reload)
+ if ((ret = load_textfile(ctx)) < 0)
+ return ret;
+
+ dtext->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
+ NAN : frame->pts * av_q2d(inlink->time_base);
- draw_text(ctx, picref, picref->video->w, picref->video->h);
+ draw_text(ctx, frame, frame->video->w, frame->video->h);
av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
(int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],
dtext->var_values[VAR_N] += 1.0;
- if ((ret = ff_draw_slice(outlink, 0, picref->video->h, 1)) < 0 ||
- (ret = ff_end_frame(outlink)) < 0)
- return ret;
- return 0;
+ return ff_filter_frame(outlink, frame);
}
static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.get_video_buffer = ff_null_get_video_buffer,
- .start_frame = ff_null_start_frame,
- .draw_slice = null_draw_slice,
- .end_frame = end_frame,
+ .filter_frame = filter_frame,
.config_props = config_input,
.min_perms = AV_PERM_WRITE |
AV_PERM_READ,
projects / ffmpeg / blobdiff