Initial versions of code to all per-frame video processing in ffmpeg.

Originally committed as revision 1244 to svn://svn.ffmpeg.org/ffmpeg/trunk

libav/framehook.c

+/*
+ * Video processing hooks
+ * Copyright (c) 2000, 2001 Fabrice Bellard.
+ *
+ * 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 <errno.h>
+#include "config.h"
+#include "framehook.h"
+#include "avformat.h"
+
+#ifdef HAVE_VHOOK
+#include <dlfcn.h>
+#endif
+
+
+typedef struct _FrameHookEntry {
+    struct _FrameHookEntry *next;
+    FrameHookConfigureFn Configure;
+    FrameHookProcessFn Process;
+    void *ctx;
+} FrameHookEntry;
+
+static FrameHookEntry *first_hook;
+
+/* Returns 0 on OK */
+int frame_hook_add(int argc, char *argv[])
+{
+#ifdef HAVE_VHOOK
+    void *loaded;
+    FrameHookEntry *fhe, **fhep;
+
+    if (argc < 1) {
+        return ENOENT;
+    }
+
+    loaded = dlopen(argv[0], RTLD_NOW);
+    if (!loaded) {
+        fprintf(stderr, "%s\n", dlerror());
+        return -1;
+    }
+
+    fhe = av_mallocz(sizeof(*fhe));
+    if (!fhe) {
+        return errno;
+    }
+
+    fhe->Configure = dlsym(loaded, "Configure");
+    fhe->Process = dlsym(loaded, "Process");
+
+    if (!fhe->Process) {
+        fprintf(stderr, "Failed to find Process entrypoint in %s\n", argv[0]);
+        return -1;
+    }
+
+    if (!fhe->Configure && argc > 1) {
+        fprintf(stderr, "Failed to find Configure entrypoint in %s\n", argv[0]);
+        return -1;
+    }
+
+    if (argc > 1 || fhe->Configure) {
+        if (fhe->Configure(&fhe->ctx, argc, argv)) {
+            fprintf(stderr, "Failed to Configure %s\n", argv[0]);
+            return -1;
+        }
+    }
+
+    for (fhep = &first_hook; *fhep; fhep = &((*fhep)->next)) {
+    }
+
+    *fhep = fhe;
+
+    return 0;
+#else
+    fprintf(stderr, "Video hooking not compiled into this version\n");
+    return 1;
+#endif
+}
+
+void frame_hook_process(AVPicture *pict, enum PixelFormat pix_fmt, int width, int height)
+{
+    if (first_hook) {
+        FrameHookEntry *fhe;
+        INT64 pts = av_gettime();
+
+        for (fhe = first_hook; fhe; fhe = fhe->next) {
+            fhe->Process(fhe->ctx, pict, pix_fmt, width, height, pts);
+        }
+    }
+}

libav/framehook.h

+#ifndef _FRAMEHOOK_H
+#define _FRAMEHOOK_H
+
+/*
+ * Prototypes for interface to .so that implement a video processing hook 
+ */
+
+#include "avcodec.h"
+
+/* Function must be called 'Configure' */
+typedef int (*FrameHookConfigureFn)(void **ctxp, int argc, char *argv[]);
+
+/* Function must be called 'Process' */
+typedef void (*FrameHookProcessFn)(void *ctx, struct AVPicture *pict, enum PixelFormat pix_fmt, int width, int height, INT64 pts);
+
+extern int frame_hook_add(int argc, char *argv[]);
+extern void frame_hook_process(struct AVPicture *pict, enum PixelFormat pix_fmt, int width, int height);
+
+#endif