277 lines
7.5 KiB
C
277 lines
7.5 KiB
C
/*
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* imlib2 based hook
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* Copyright (c) 2002 Philip Gladstone
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*
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* This module implements a text overlay for a video image. Currently it
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* supports a fixed overlay or reading the text from a file. The string
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* is passed through strftime so that it is easy to imprint the date and
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* time onto the image.
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*
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* Options:
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*
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* -c <color> The color of the text
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* -F <fontname> The font face and size
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* -t <text> The text
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* -f <filename> The filename to read text from
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* -x <num> X coordinate to start text
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* -y <num> Y coordinate to start text
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*
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* This module is very much intended as an example of what could be done.
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* For example, you could overlay an image (even semi-transparent) like
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* TV stations do. You can manipulate the image using imlib2 functions
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* in any way.
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*
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* One caution is that this is an expensive process -- in particular the
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* conversion of the image into RGB and back is time consuming. For some
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* special cases -- e.g. painting black text -- it would be faster to paint
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* the text into a bitmap and then combine it directly into the YUV
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* image. However, this code is fast enough to handle 10 fps of 320x240 on a
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* 900MHz Duron in maybe 15% of the CPU.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <X11/Xlib.h>
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#include <Imlib2.h>
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#include "framehook.h"
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typedef struct {
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int dummy;
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Imlib_Font fn;
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char *text;
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char *file;
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int r, g, b;
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int x;
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int y;
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struct _CachedImage *cache;
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} ContextInfo;
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typedef struct _CachedImage {
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struct _CachedImage *next;
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Imlib_Image image;
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int width;
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int height;
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} CachedImage;
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void Release(void *ctx)
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{
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ContextInfo *ci;
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ci = (ContextInfo *) ctx;
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if (ci->cache) {
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imlib_context_set_image(ci->cache->image);
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imlib_free_image();
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av_free(ci->cache);
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}
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if (ctx)
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av_free(ctx);
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}
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int Configure(void **ctxp, int argc, char *argv[])
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{
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int c;
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ContextInfo *ci;
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char *font = "LucidaSansDemiBold/16";
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char *fp = getenv("FONTPATH");
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char *color = 0;
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FILE *f;
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*ctxp = av_mallocz(sizeof(ContextInfo));
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ci = (ContextInfo *) *ctxp;
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optind = 0;
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if (fp)
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imlib_add_path_to_font_path(fp);
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while ((c = getopt(argc, argv, "c:f:F:t:x:y:")) > 0) {
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switch (c) {
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case 'c':
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color = optarg;
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break;
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case 'F':
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font = optarg;
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break;
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case 't':
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ci->text = av_strdup(optarg);
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break;
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case 'f':
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ci->file = av_strdup(optarg);
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break;
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case 'x':
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ci->x = atoi(optarg);
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break;
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case 'y':
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ci->y = atoi(optarg);
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break;
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case '?':
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fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
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return -1;
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}
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}
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ci->fn = imlib_load_font(font);
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if (!ci->fn) {
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fprintf(stderr, "Failed to load font '%s'\n", font);
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return -1;
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}
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imlib_context_set_font(ci->fn);
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imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT);
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if (color) {
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char buff[256];
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int done = 0;
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f = fopen("/usr/lib/X11/rgb.txt", "r");
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if (!f) {
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fprintf(stderr, "Failed to find rgb.txt\n");
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return -1;
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}
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while (fgets(buff, sizeof(buff), f)) {
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int r, g, b;
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char colname[80];
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if (sscanf(buff, "%d %d %d %64s", &r, &g, &b, colname) == 4 &&
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strcasecmp(colname, color) == 0) {
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ci->r = r;
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ci->g = g;
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ci->b = b;
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/* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
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done = 1;
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break;
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}
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}
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fclose(f);
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if (!done) {
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fprintf(stderr, "Unable to find color '%s' in rgb.txt\n", color);
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return -1;
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}
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}
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imlib_context_set_color(ci->r, ci->g, ci->b, 255);
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return 0;
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}
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static Imlib_Image get_cached_image(ContextInfo *ci, int width, int height)
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{
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CachedImage *cache;
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for (cache = ci->cache; cache; cache = cache->next) {
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if (width == cache->width && height == cache->height)
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return cache->image;
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}
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return NULL;
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}
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static void put_cached_image(ContextInfo *ci, Imlib_Image image, int width, int height)
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{
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CachedImage *cache = av_mallocz(sizeof(*cache));
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cache->image = image;
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cache->width = width;
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cache->height = height;
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cache->next = ci->cache;
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ci->cache = cache;
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}
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void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
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{
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ContextInfo *ci = (ContextInfo *) ctx;
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AVPicture picture1;
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Imlib_Image image;
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DATA32 *data;
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image = get_cached_image(ci, width, height);
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if (!image) {
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image = imlib_create_image(width, height);
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put_cached_image(ci, image, width, height);
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}
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imlib_context_set_image(image);
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data = imlib_image_get_data();
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if (pix_fmt != PIX_FMT_RGBA32) {
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avpicture_fill(&picture1, (uint8_t *) data, PIX_FMT_RGBA32, width, height);
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if (img_convert(&picture1, PIX_FMT_RGBA32,
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picture, pix_fmt, width, height) < 0) {
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goto done;
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}
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} else {
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av_abort();
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}
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imlib_image_set_has_alpha(0);
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{
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int wid, hig, h_a, v_a;
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char buff[1000];
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char tbuff[1000];
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char *tbp = ci->text;
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time_t now = time(0);
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char *p, *q;
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int x, y;
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if (ci->file) {
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int fd = open(ci->file, O_RDONLY);
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if (fd < 0) {
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tbp = "[File not found]";
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} else {
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int l = read(fd, tbuff, sizeof(tbuff) - 1);
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if (l >= 0) {
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tbuff[l] = 0;
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tbp = tbuff;
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} else {
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tbp = "[I/O Error]";
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}
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close(fd);
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}
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}
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strftime(buff, sizeof(buff), tbp ? tbp : "[No data]", localtime(&now));
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x = ci->x;
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y = ci->y;
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for (p = buff; p; p = q) {
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q = strchr(p, '\n');
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if (q)
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*q++ = 0;
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imlib_text_draw_with_return_metrics(x, y, p, &wid, &hig, &h_a, &v_a);
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y += v_a;
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}
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}
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if (pix_fmt != PIX_FMT_RGBA32) {
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if (img_convert(picture, pix_fmt,
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&picture1, PIX_FMT_RGBA32, width, height) < 0) {
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}
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}
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done:
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;
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}
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