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ffmpeg / libavformat / framehook.c @ d7fb5a18

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/*
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 * Video processing hooks
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 * Copyright (c) 2000, 2001 Fabrice Bellard.
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <errno.h>
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#include "config.h"
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#include "avformat.h"
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#include "framehook.h"
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#ifdef HAVE_DLFCN_H
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#include <dlfcn.h>
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#endif
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typedef struct FrameHookEntry {
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    struct FrameHookEntry *next;
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    FrameHookConfigureFn Configure;
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    FrameHookProcessFn Process;
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    FrameHookReleaseFn Release;
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    void *ctx;
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} FrameHookEntry;
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static FrameHookEntry *first_hook;
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/* Returns 0 on OK */
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int frame_hook_add(int argc, char *argv[])
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{
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    void *loaded;
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    FrameHookEntry *fhe, **fhep;
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    if (argc < 1) {
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        return ENOENT;
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    }
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    loaded = dlopen(argv[0], RTLD_NOW);
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    if (!loaded) {
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        av_log(NULL, AV_LOG_ERROR, "%s\n", dlerror());
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        return -1;
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    }
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    fhe = av_mallocz(sizeof(*fhe));
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    if (!fhe) {
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        return AVERROR(ENOMEM);
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    }
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    fhe->Configure = dlsym(loaded, "Configure");
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    fhe->Process = dlsym(loaded, "Process");
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    fhe->Release = dlsym(loaded, "Release");    /* Optional */
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    if (!fhe->Process) {
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        av_log(NULL, AV_LOG_ERROR, "Failed to find Process entrypoint in %s\n", argv[0]);
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        return AVERROR(ENOENT);
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    }
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    if (!fhe->Configure && argc > 1) {
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        av_log(NULL, AV_LOG_ERROR, "Failed to find Configure entrypoint in %s\n", argv[0]);
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        return AVERROR(ENOENT);
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    }
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    if (argc > 1 || fhe->Configure) {
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        if (fhe->Configure(&fhe->ctx, argc, argv)) {
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            av_log(NULL, AV_LOG_ERROR, "Failed to Configure %s\n", argv[0]);
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            return AVERROR(EINVAL);
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        }
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    }
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    for (fhep = &first_hook; *fhep; fhep = &((*fhep)->next)) {
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    }
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    *fhep = fhe;
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    return 0;
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}
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void frame_hook_process(AVPicture *pict, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
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{
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    if (first_hook) {
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        FrameHookEntry *fhe;
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        for (fhe = first_hook; fhe; fhe = fhe->next) {
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            fhe->Process(fhe->ctx, pict, pix_fmt, width, height, pts);
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        }
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    }
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}
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void frame_hook_release(void)
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{
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    FrameHookEntry *fhe;
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    FrameHookEntry *fhenext;
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    for (fhe = first_hook; fhe; fhe = fhenext) {
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        fhenext = fhe->next;
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        if (fhe->Release)
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            fhe->Release(fhe->ctx);
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        av_free(fhe);
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    }
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    first_hook = NULL;
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}