| /* |
| * Video processing hooks |
| * Copyright (c) 2000, 2001 Fabrice Bellard |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg 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 FFmpeg; 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" |
| |
| #if HAVE_DLFCN_H |
| #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[]) |
| { |
| 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 AVERROR(ENOMEM); |
| } |
| |
| 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 AVERROR(ENOENT); |
| } |
| |
| if (!fhe->Configure && argc > 1) { |
| av_log(NULL, AV_LOG_ERROR, "Failed to find Configure entrypoint in %s\n", argv[0]); |
| return AVERROR(ENOENT); |
| } |
| |
| 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 AVERROR(EINVAL); |
| } |
| } |
| |
| for (fhep = &first_hook; *fhep; fhep = &((*fhep)->next)) { |
| } |
| |
| *fhep = fhe; |
| |
| return 0; |
| } |
| |
| void frame_hook_process(AVPicture *pict, enum PixelFormat pix_fmt, int width, int height, int64_t pts) |
| { |
| if (first_hook) { |
| FrameHookEntry *fhe; |
| |
| 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; |
| } |