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FFmpeg/vhook/imlib2.c
Philip Gladstone 6c11d48cab Added a release function to free up the context. Also removed the dummy
declarations at the bottom of the file. This type checking is now handled by the
header file.

Originally committed as revision 1295 to svn://svn.ffmpeg.org/ffmpeg/trunk
2002-11-30 17:17:58 +00:00

277 lines
7.5 KiB
C

/*
* 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.
*
* Options:
*
* -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 <num> X coordinate to start text
* -y <num> Y coordinate to start text
*
* This module is very much intended as an example of what could be done.
* For example, you could overlay an image (even semi-transparent) like
* TV stations do. You can manipulate the image using imlib2 functions
* in any way.
*
* One caution is that this is an expensive process -- in particular the
* conversion of the image into RGB and back is time consuming. For some
* special cases -- e.g. painting black text -- it would be faster to paint
* the text into a bitmap and then combine it directly into the YUV
* image. However, this code is fast enough to handle 10 fps of 320x240 on a
* 900MHz Duron in maybe 15% of the CPU.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <sys/time.h>
#include <X11/Xlib.h>
#include <Imlib2.h>
#include "framehook.h"
typedef struct {
int dummy;
Imlib_Font fn;
char *text;
char *file;
int r, g, b;
int x;
int y;
struct _CachedImage *cache;
} ContextInfo;
typedef struct _CachedImage {
struct _CachedImage *next;
Imlib_Image image;
int width;
int height;
} CachedImage;
void Release(void *ctx)
{
ContextInfo *ci;
ci = (ContextInfo *) ctx;
if (ci->cache) {
imlib_context_set_image(ci->cache->image);
imlib_free_image();
av_free(ci->cache);
}
if (ctx)
av_free(ctx);
}
int Configure(void **ctxp, int argc, char *argv[])
{
int c;
ContextInfo *ci;
char *font = "LucidaSansDemiBold/16";
char *fp = getenv("FONTPATH");
char *color = 0;
FILE *f;
*ctxp = av_mallocz(sizeof(ContextInfo));
ci = (ContextInfo *) *ctxp;
optind = 0;
if (fp)
imlib_add_path_to_font_path(fp);
while ((c = getopt(argc, argv, "c:f:F:t:x:y:")) > 0) {
switch (c) {
case 'c':
color = optarg;
break;
case 'F':
font = optarg;
break;
case 't':
ci->text = strdup(optarg);
break;
case 'f':
ci->file = strdup(optarg);
break;
case 'x':
ci->x = atoi(optarg);
break;
case 'y':
ci->y = atoi(optarg);
break;
case '?':
fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
return -1;
}
}
ci->fn = imlib_load_font(font);
if (!ci->fn) {
fprintf(stderr, "Failed to load font '%s'\n", font);
return -1;
}
imlib_context_set_font(ci->fn);
imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT);
if (color) {
char buff[256];
int done = 0;
f = fopen("/usr/lib/X11/rgb.txt", "r");
if (!f) {
fprintf(stderr, "Failed to find rgb.txt\n");
return -1;
}
while (fgets(buff, sizeof(buff), f)) {
int r, g, b;
char colname[80];
if (sscanf(buff, "%d %d %d %64s", &r, &g, &b, colname) == 4 &&
strcasecmp(colname, color) == 0) {
ci->r = r;
ci->g = g;
ci->b = b;
/* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
done = 1;
break;
}
}
fclose(f);
if (!done) {
fprintf(stderr, "Unable to find color '%s' in rgb.txt\n", color);
return -1;
}
}
imlib_context_set_color(ci->r, ci->g, ci->b, 255);
return 0;
}
static Imlib_Image get_cached_image(ContextInfo *ci, int width, int height)
{
CachedImage *cache;
for (cache = ci->cache; cache; cache = cache->next) {
if (width == cache->width && height == cache->height)
return cache->image;
}
return NULL;
}
static void put_cached_image(ContextInfo *ci, Imlib_Image image, int width, int height)
{
CachedImage *cache = av_mallocz(sizeof(*cache));
cache->image = image;
cache->width = width;
cache->height = height;
cache->next = ci->cache;
ci->cache = cache;
}
void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, INT64 pts)
{
ContextInfo *ci = (ContextInfo *) ctx;
AVPicture picture1;
Imlib_Image image;
DATA32 *data;
image = get_cached_image(ci, width, height);
if (!image) {
image = imlib_create_image(width, height);
put_cached_image(ci, image, width, height);
}
imlib_context_set_image(image);
data = imlib_image_get_data();
if (pix_fmt != PIX_FMT_BGRA32) {
avpicture_fill(&picture1, (UINT8 *) data, PIX_FMT_BGRA32, width, height);
if (img_convert(&picture1, PIX_FMT_BGRA32,
picture, pix_fmt, width, height) < 0) {
goto done;
}
} else {
av_abort();
}
imlib_image_set_has_alpha(0);
{
int wid, hig, h_a, v_a;
char buff[1000];
char tbuff[1000];
char *tbp = ci->text;
time_t now = time(0);
char *p, *q;
int x, y;
if (ci->file) {
int fd = open(ci->file, O_RDONLY);
if (fd < 0) {
tbp = "[File not found]";
} else {
int l = read(fd, tbuff, sizeof(tbuff) - 1);
if (l >= 0) {
tbuff[l] = 0;
tbp = tbuff;
} else {
tbp = "[I/O Error]";
}
close(fd);
}
}
strftime(buff, sizeof(buff), tbp, localtime(&now));
x = ci->x;
y = ci->y;
for (p = buff; p; p = q) {
q = strchr(p, '\n');
if (q)
*q++ = 0;
imlib_text_draw_with_return_metrics(x, y, p, &wid, &hig, &h_a, &v_a);
y += v_a;
}
}
if (pix_fmt != PIX_FMT_BGRA32) {
if (img_convert(picture, pix_fmt,
&picture1, PIX_FMT_BGRA32, width, height) < 0) {
}
}
done:
;
}