This fixes error handling for BeOS, removing the need for some ifdefs.
[libav.git] / libavformat / framehook.c
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 #ifdef HAVE_DLFCN_H
27 #include <dlfcn.h>
28 #endif
29
30
31 typedef struct _FrameHookEntry {
32 struct _FrameHookEntry *next;
33 FrameHookConfigureFn Configure;
34 FrameHookProcessFn Process;
35 FrameHookReleaseFn Release;
36 void *ctx;
37 } FrameHookEntry;
38
39 static FrameHookEntry *first_hook;
40
41 /* Returns 0 on OK */
42 int frame_hook_add(int argc, char *argv[])
43 {
44 #ifdef CONFIG_VHOOK
45 void *loaded;
46 FrameHookEntry *fhe, **fhep;
47
48 if (argc < 1) {
49 return ENOENT;
50 }
51
52 loaded = dlopen(argv[0], RTLD_NOW);
53 if (!loaded) {
54 av_log(NULL, AV_LOG_ERROR, "%s\n", dlerror());
55 return -1;
56 }
57
58 fhe = av_mallocz(sizeof(*fhe));
59 if (!fhe) {
60 return AVERROR(ENOMEM);
61 }
62
63 fhe->Configure = dlsym(loaded, "Configure");
64 fhe->Process = dlsym(loaded, "Process");
65 fhe->Release = dlsym(loaded, "Release"); /* Optional */
66
67 if (!fhe->Process) {
68 av_log(NULL, AV_LOG_ERROR, "Failed to find Process entrypoint in %s\n", argv[0]);
69 return AVERROR(ENOENT);
70 }
71
72 if (!fhe->Configure && argc > 1) {
73 av_log(NULL, AV_LOG_ERROR, "Failed to find Configure entrypoint in %s\n", argv[0]);
74 return AVERROR(ENOENT);
75 }
76
77 if (argc > 1 || fhe->Configure) {
78 if (fhe->Configure(&fhe->ctx, argc, argv)) {
79 av_log(NULL, AV_LOG_ERROR, "Failed to Configure %s\n", argv[0]);
80 return AVERROR(EINVAL);
81 }
82 }
83
84 for (fhep = &first_hook; *fhep; fhep = &((*fhep)->next)) {
85 }
86
87 *fhep = fhe;
88
89 return 0;
90 #else
91 av_log(NULL, AV_LOG_ERROR, "Video hooking not compiled into this version\n");
92 return 1;
93 #endif
94 }
95
96 void frame_hook_process(AVPicture *pict, enum PixelFormat pix_fmt, int width, int height)
97 {
98 if (first_hook) {
99 FrameHookEntry *fhe;
100 int64_t pts = av_gettime();
101
102 for (fhe = first_hook; fhe; fhe = fhe->next) {
103 fhe->Process(fhe->ctx, pict, pix_fmt, width, height, pts);
104 }
105 }
106 }
107
108 void frame_hook_release(void)
109 {
110 FrameHookEntry *fhe;
111 FrameHookEntry *fhenext;
112
113 for (fhe = first_hook; fhe; fhe = fhenext) {
114 fhenext = fhe->next;
115 if (fhe->Release)
116 fhe->Release(fhe->ctx);
117 av_free(fhe);
118 }
119
120 first_hook = NULL;
121 }