| /* |
| * Null Video Hook |
| * Copyright (c) 2002 Philip Gladstone |
| * |
| * 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 <stdio.h> |
| |
| #include "libavformat/framehook.h" |
| #include "libswscale/swscale.h" |
| |
| static int sws_flags = SWS_BICUBIC; |
| |
| typedef struct { |
| int dummy; |
| |
| // This vhook first converts frame to RGB ... |
| struct SwsContext *toRGB_convert_ctx; |
| |
| // ... and later converts back frame from RGB to initial format |
| struct SwsContext *fromRGB_convert_ctx; |
| |
| } ContextInfo; |
| |
| void Release(void *ctx) |
| { |
| ContextInfo *ci; |
| ci = (ContextInfo *) ctx; |
| |
| if (ctx) { |
| sws_freeContext(ci->toRGB_convert_ctx); |
| sws_freeContext(ci->fromRGB_convert_ctx); |
| av_free(ctx); |
| } |
| } |
| |
| int Configure(void **ctxp, int argc, char *argv[]) |
| { |
| av_log(NULL, AV_LOG_DEBUG, "Called with argc=%d\n", argc); |
| |
| *ctxp = av_mallocz(sizeof(ContextInfo)); |
| return 0; |
| } |
| |
| void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts) |
| { |
| ContextInfo *ci = (ContextInfo *) ctx; |
| char *buf = 0; |
| AVPicture picture1; |
| AVPicture *pict = picture; |
| |
| (void) ci; |
| |
| if (pix_fmt != PIX_FMT_RGB24) { |
| int size; |
| |
| size = avpicture_get_size(PIX_FMT_RGB24, width, height); |
| buf = av_malloc(size); |
| |
| avpicture_fill(&picture1, buf, PIX_FMT_RGB24, width, height); |
| |
| // if we already got a SWS context, let's realloc if is not re-useable |
| ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx, |
| width, height, pix_fmt, |
| width, height, PIX_FMT_RGB24, |
| sws_flags, NULL, NULL, NULL); |
| if (ci->toRGB_convert_ctx == NULL) { |
| av_log(NULL, AV_LOG_ERROR, |
| "Cannot initialize the toRGB conversion context\n"); |
| return; |
| } |
| // img_convert parameters are 2 first destination, then 4 source |
| // sws_scale parameters are context, 4 first source, then 2 destination |
| sws_scale(ci->toRGB_convert_ctx, |
| picture->data, picture->linesize, 0, height, |
| picture1.data, picture1.linesize); |
| |
| pict = &picture1; |
| } |
| |
| /* Insert filter code here */ |
| |
| if (pix_fmt != PIX_FMT_RGB24) { |
| ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx, |
| width, height, PIX_FMT_RGB24, |
| width, height, pix_fmt, |
| sws_flags, NULL, NULL, NULL); |
| if (ci->fromRGB_convert_ctx == NULL) { |
| av_log(NULL, AV_LOG_ERROR, |
| "Cannot initialize the fromRGB conversion context\n"); |
| return; |
| } |
| // img_convert parameters are 2 first destination, then 4 source |
| // sws_scale parameters are context, 4 first source, then 2 destination |
| sws_scale(ci->fromRGB_convert_ctx, |
| picture1.data, picture1.linesize, 0, height, |
| picture->data, picture->linesize); |
| } |
| |
| av_free(buf); |
| } |
| |