ffmpeg/vhook/imlib2.c

277 lines
7.5 KiB
C
Raw Normal View History

/*
* 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:
;
}