Added three sample video hooks. See the (rudimentary) documentation on what

they do and their capabilities.

Originally committed as revision 1265 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 267 insertions, 0 deletions

diff --git a/vhook/imlib2.c b/vhook/imlib2.c
new file mode 100644
index 0000000000..3e11d9c1b2
--- /dev/null
+++ b/vhook/imlib2.c
@@ -0,0 +1,267 @@
+/*
+ * 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 <getopt.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;
+
+
+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:
+    ;
+}
+
+/* To ensure correct typing */
+FrameHookConfigureFn ConfigureFn = Configure;
+FrameHookProcessFn ProcessFn = Process;