* imlib2 based hook
* Copyright (c) 2002 Philip Gladstone
*
- * This module implements a text overlay for a video image. Currently it
- * supports a fixed overlay or reading the text from a file. The string
- * is passed through strftime so that it is easy to imprint the date and
- * time onto the image.
- *
- * You may also overlay an image (even semi-transparent) like TV stations do.
- * You may move either the text or the image around your video to create
- * scrolling credits, for example.
- *
- * Text fonts are being looked for in FONTPATH
- *
- * Options:
- *
- * -C <rgb.txt> The filename to read RGB color names from
- * Defaults if none specified:
- * /usr/share/X11/rgb.txt
- * /usr/lib/X11/rgb.txt
- * -c <color> The color of the text
- * -F <fontname> The font face and size
- * -t <text> The text
- * -f <filename> The filename to read text from
- * -x <expression> X coordinate of text or image
- * -y <expression> Y coordinate of text or image
- * -i <filename> The filename to read a image from
- * -R <expression> Value for R color
- * -G <expression> Value for G color
- * -B <expression> Value for B color
- * -A <expression> Value for Alpha channel
- *
- * Expressions are functions of:
- * N // frame number (starting at zero)
- * H // frame height
- * W // frame width
- * h // image height
- * w // image width
- * X // previous x
- * Y // previous y
- *
-
- Examples:
-
- FONTPATH="/cygdrive/c/WINDOWS/Fonts/"
- FONTPATH="$FONTPATH:/usr/share/imlib2/data/fonts/"
- FONTPATH="$FONTPATH:/usr/X11R6/lib/X11/fonts/TTF/"
- export FONTPATH
-
- ffmpeg -i input.avi -vhook \
- 'vhook/imlib2.dll -x W*(0.5+0.25*sin(N/47*PI))-w/2 -y H*(0.5+0.50*cos(N/97*PI))-h/2 -i /usr/share/imlib2/data/images/bulb.png'
- -acodec copy -sameq output.avi
-
- ffmpeg -i input.avi -vhook \
- 'vhook/imlib2.dll -c red -F Vera.ttf/20 -x 150+0.5*N -y 70+0.25*N -t Hello'
- -acodec copy -sameq output.avi
-
* This module is very much intended as an example of what could be done.
*
* One caution is that this is an expensive process -- in particular the
int eval_colors;
double x, y;
char *fileImage;
- struct _CachedImage *cache;
+ struct CachedImage *cache;
Imlib_Image imageOverlaid;
AVEvalExpr *eval_x, *eval_y;
char *expr_x, *expr_y;
struct SwsContext *fromRGB_convert_ctx;
} ContextInfo;
-typedef struct _CachedImage {
- struct _CachedImage *next;
+typedef struct CachedImage {
+ struct CachedImage *next;
Imlib_Image image;
int width;
int height;
char *color = 0;
FILE *f;
char *p;
+ char *error;
*ctxp = av_mallocz(sizeof(ContextInfo));
ci = (ContextInfo *) *ctxp;
ci->expr_x = "0.0";
ci->expr_y = "0.0";
- optind = 0;
+ optind = 1;
/* Use ':' to split FONTPATH */
if (fp)
return -1;
}
} else if (ci->eval_colors) {
- if (!(ci->eval_r = ff_parse(ci->expr_R, const_names, NULL, NULL, NULL, NULL, NULL))){
- av_log(NULL, AV_LOG_ERROR, "Couldn't parse R expression '%s'\n", ci->expr_R);
+ if (!(ci->eval_r = ff_parse(ci->expr_R, const_names, NULL, NULL, NULL, NULL, &error))){
+ av_log(NULL, AV_LOG_ERROR, "Couldn't parse R expression '%s': %s\n", ci->expr_R, error);
return -1;
}
- if (!(ci->eval_g = ff_parse(ci->expr_G, const_names, NULL, NULL, NULL, NULL, NULL))){
- av_log(NULL, AV_LOG_ERROR, "Couldn't parse G expression '%s'\n", ci->expr_G);
+ if (!(ci->eval_g = ff_parse(ci->expr_G, const_names, NULL, NULL, NULL, NULL, &error))){
+ av_log(NULL, AV_LOG_ERROR, "Couldn't parse G expression '%s': %s\n", ci->expr_G, error);
return -1;
}
- if (!(ci->eval_b = ff_parse(ci->expr_B, const_names, NULL, NULL, NULL, NULL, NULL))){
- av_log(NULL, AV_LOG_ERROR, "Couldn't parse B expression '%s'\n", ci->expr_B);
+ if (!(ci->eval_b = ff_parse(ci->expr_B, const_names, NULL, NULL, NULL, NULL, &error))){
+ av_log(NULL, AV_LOG_ERROR, "Couldn't parse B expression '%s': %s\n", ci->expr_B, error);
return -1;
}
}
if (ci->expr_A) {
- if (!(ci->eval_a = ff_parse(ci->expr_A, const_names, NULL, NULL, NULL, NULL, NULL))){
- av_log(NULL, AV_LOG_ERROR, "Couldn't parse A expression '%s'\n", ci->expr_A);
+ if (!(ci->eval_a = ff_parse(ci->expr_A, const_names, NULL, NULL, NULL, NULL, &error))){
+ av_log(NULL, AV_LOG_ERROR, "Couldn't parse A expression '%s': %s\n", ci->expr_A, error);
return -1;
}
} else {
ci->imageOverlaid_height = imlib_image_get_height();
}
- if (!(ci->eval_x = ff_parse(ci->expr_x, const_names, NULL, NULL, NULL, NULL, NULL))){
- av_log(NULL, AV_LOG_ERROR, "Couldn't parse x expression '%s'\n", ci->expr_x);
+ if (!(ci->eval_x = ff_parse(ci->expr_x, const_names, NULL, NULL, NULL, NULL, &error))){
+ av_log(NULL, AV_LOG_ERROR, "Couldn't parse x expression '%s': %s\n", ci->expr_x, error);
return -1;
}
- if (!(ci->eval_y = ff_parse(ci->expr_y, const_names, NULL, NULL, NULL, NULL, NULL))){
- av_log(NULL, AV_LOG_ERROR, "Couldn't parse y expression '%s'\n", ci->expr_y);
+ if (!(ci->eval_y = ff_parse(ci->expr_y, const_names, NULL, NULL, NULL, NULL, &error))){
+ av_log(NULL, AV_LOG_ERROR, "Couldn't parse y expression '%s': %s\n", ci->expr_y, error);
return -1;
}
projects / ffmpeg / blobdiff