1/*
2 * Video processing hooks
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21#include <errno.h>
22#include "config.h"
23#include "avformat.h"
24#include "framehook.h"
25
26#if HAVE_DLFCN_H
27#include <dlfcn.h>
28#endif
29
30
31typedef struct FrameHookEntry {
32    struct FrameHookEntry *next;
33    FrameHookConfigureFn Configure;
34    FrameHookProcessFn Process;
35    FrameHookReleaseFn Release;
36    void *ctx;
37} FrameHookEntry;
38
39static FrameHookEntry *first_hook;
40
41/* Returns 0 on OK */
42int frame_hook_add(int argc, char *argv[])
43{
44    void *loaded;
45    FrameHookEntry *fhe, **fhep;
46
47    if (argc < 1) {
48        return ENOENT;
49    }
50
51    loaded = dlopen(argv[0], RTLD_NOW);
52    if (!loaded) {
53        av_log(NULL, AV_LOG_ERROR, "%s\n", dlerror());
54        return -1;
55    }
56
57    fhe = av_mallocz(sizeof(*fhe));
58    if (!fhe) {
59        return AVERROR(ENOMEM);
60    }
61
62    fhe->Configure = dlsym(loaded, "Configure");
63    fhe->Process = dlsym(loaded, "Process");
64    fhe->Release = dlsym(loaded, "Release");    /* Optional */
65
66    if (!fhe->Process) {
67        av_log(NULL, AV_LOG_ERROR, "Failed to find Process entrypoint in %s\n", argv[0]);
68        return AVERROR(ENOENT);
69    }
70
71    if (!fhe->Configure && argc > 1) {
72        av_log(NULL, AV_LOG_ERROR, "Failed to find Configure entrypoint in %s\n", argv[0]);
73        return AVERROR(ENOENT);
74    }
75
76    if (argc > 1 || fhe->Configure) {
77        if (fhe->Configure(&fhe->ctx, argc, argv)) {
78            av_log(NULL, AV_LOG_ERROR, "Failed to Configure %s\n", argv[0]);
79            return AVERROR(EINVAL);
80        }
81    }
82
83    for (fhep = &first_hook; *fhep; fhep = &((*fhep)->next)) {
84    }
85
86    *fhep = fhe;
87
88    return 0;
89}
90
91void frame_hook_process(AVPicture *pict, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
92{
93    if (first_hook) {
94        FrameHookEntry *fhe;
95
96        for (fhe = first_hook; fhe; fhe = fhe->next) {
97            fhe->Process(fhe->ctx, pict, pix_fmt, width, height, pts);
98        }
99    }
100}
101
102void frame_hook_release(void)
103{
104    FrameHookEntry *fhe;
105    FrameHookEntry *fhenext;
106
107    for (fhe = first_hook; fhe; fhe = fhenext) {
108        fhenext = fhe->next;
109        if (fhe->Release)
110            fhe->Release(fhe->ctx);
111        av_free(fhe);
112    }
113
114    first_hook = NULL;
115}
116