PeerStreamer

/*

 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include <errno.h>

#include "config.h"

#include "avformat.h"

#include "framehook.h"

#ifdef CONFIG_HAVE_DLFCN

#include <dlfcn.h>

#endif

typedef struct _FrameHookEntry {

    struct _FrameHookEntry *next;

    FrameHookConfigureFn Configure;

    FrameHookProcessFn Process;

    FrameHookReleaseFn Release;

    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) {

        av_log(NULL, AV_LOG_ERROR, "%s\n", dlerror());

        return -1;

    }

    fhe = av_mallocz(sizeof(*fhe));

    if (!fhe) {

        return errno;

    }

    fhe->Configure = dlsym(loaded, "Configure");

    fhe->Process = dlsym(loaded, "Process");

    fhe->Release = dlsym(loaded, "Release");    /* Optional */

    if (!fhe->Process) {

        av_log(NULL, AV_LOG_ERROR, "Failed to find Process entrypoint in %s\n", argv[0]);

        return -1;

    }

    if (!fhe->Configure && argc > 1) {

        av_log(NULL, AV_LOG_ERROR, "Failed to find Configure entrypoint in %s\n", argv[0]);

        return -1;

    }

    if (argc > 1 || fhe->Configure) {

        if (fhe->Configure(&fhe->ctx, argc, argv)) {

            av_log(NULL, AV_LOG_ERROR, "Failed to Configure %s\n", argv[0]);

            return -1;

        }

    }

    for (fhep = &first_hook; *fhep; fhep = &((*fhep)->next)) {

    }

    *fhep = fhe;

    return 0;

#else

    av_log(NULL, AV_LOG_ERROR, "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_t pts = av_gettime();

        for (fhe = first_hook; fhe; fhe = fhe->next) {

            fhe->Process(fhe->ctx, pict, pix_fmt, width, height, pts);

        }

    }

}

void frame_hook_release(void)

{

    FrameHookEntry *fhe;

    FrameHookEntry *fhenext;

    for (fhe = first_hook; fhe; fhe = fhenext) {

        fhenext = fhe->next;

        if (fhe->Release)

            fhe->Release(fhe->ctx);

        av_free(fhe);

    }

    first_hook = NULL;

}