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Add expression evaluation parameters for colors in imlib2 vhook

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Originally committed as revision 9342 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ramiro Polla 2007-06-16 22:28:10 +00:00
parent b41c1db38d
commit 41e4c556e9
2 changed files with 64 additions and 1 deletions
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8
doc/hooks.texi
View File

@ -150,6 +150,14 @@ Usage examples:
This example does the same as the one above, but specifies an rgb.txt file
to be used, which has a custom made color in it.
# Variable colors
ffmpeg -i input.avi -vhook \
'vhook/imlib2.so -t Hello -R abs(255*sin(N/47*PI)) -G abs(255*sin(N/47*PI)) -B abs(255*sin(N/47*PI))' \
-sameq output.avi
In this example, the color for the text goes up and down from black to
white.
# scrolling credits from a graphics file
ffmpeg -sameq -i input.avi \
-vhook 'vhook/imlib2.so -x 0 -y -1.0*N -i credits.png' output.avi

57
vhook/imlib2.c
View File

@ -26,6 +26,9 @@
* -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
*
* Expressions are functions of:
* N // frame number (starting at zero)
@ -131,6 +134,9 @@ typedef struct {
char *text;
char *file;
int r, g, b;
AVEvalExpr *eval_r, *eval_g, *eval_b;
char *expr_R, *expr_G, *expr_B;
int eval_colors;
double x, y;
char *fileImage;
struct _CachedImage *cache;
@ -170,6 +176,9 @@ void Release(void *ctx)
}
ff_eval_free(ci->expr_x);
ff_eval_free(ci->expr_y);
ff_eval_free(ci->expr_R);
ff_eval_free(ci->expr_G);
ff_eval_free(ci->expr_B);
sws_freeContext(ci->toRGB_convert_ctx);
sws_freeContext(ci->fromRGB_convert_ctx);
av_free(ctx);
@ -208,8 +217,20 @@ int Configure(void **ctxp, int argc, char *argv[])
imlib_add_path_to_font_path(fp);
while ((c = getopt(argc, argv, "C:c:f:F:t:x:y:i:")) > 0) {
while ((c = getopt(argc, argv, "R:G:B:C:c:f:F:t:x:y:i:")) > 0) {
switch (c) {
case 'R':
ci->expr_R = av_strdup(optarg);
ci->eval_colors = 1;
break;
case 'G':
ci->expr_G = av_strdup(optarg);
ci->eval_colors = 1;
break;
case 'B':
ci->expr_B = av_strdup(optarg);
ci->eval_colors = 1;
break;
case 'C':
rgbtxt = optarg;
break;
@ -240,6 +261,12 @@ int Configure(void **ctxp, int argc, char *argv[])
}
}
if (ci->eval_colors && !(ci->expr_R && ci->expr_G && ci->expr_B))
{
fprintf(stderr, "You must specify expressions for all or no colors.\n");
return -1;
}
if (ci->text || ci->file) {
ci->fn = imlib_load_font(font);
if (!ci->fn) {
@ -254,6 +281,12 @@ int Configure(void **ctxp, int argc, char *argv[])
char buff[256];
int done = 0;
if (ci->eval_colors)
{
fprintf(stderr, "You must not specify both a color name and expressions for the colors.\n");
return -1;
}
if (rgbtxt)
f = fopen(rgbtxt, "r");
else
@ -285,7 +318,22 @@ int Configure(void **ctxp, int argc, char *argv[])
fprintf(stderr, "Unable to find color '%s' in rgb.txt\n", color);
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);
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);
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);
return -1;
}
}
if (!ci->eval_colors)
imlib_context_set_color(ci->r, ci->g, ci->b, 255);
/* load the image (for example, credits for a movie) */
@ -423,6 +471,13 @@ void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width,
ci->y = ff_parse_eval(ci->eval_y, const_values, ci);
y = ci->y;
if (ci->eval_colors) {
ci->r = ff_parse_eval(ci->eval_r, const_values, ci);
ci->g = ff_parse_eval(ci->eval_g, const_values, ci);
ci->b = ff_parse_eval(ci->eval_b, const_values, ci);
imlib_context_set_color(ci->r, ci->g, ci->b, 255);
}
if (!(ci->imageOverlaid))
for (p = buff; p; p = q) {
q = strchr(p, '\n');