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