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/*
* Null Video Hook
* Copyright (c) 2002 Philip Gladstone
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include "framehook.h"
#include "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;
enum PixelFormat sws_pix_fmt; // Sws_Context is opaque, we need to save
int sws_width, sws_height; // this to check if we can re-use contexts
// Contexts will be re-used 99% of time,
// I know of width/height changes only in DVB broadcasts
} 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[])
{
fprintf(stderr, "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
if (ci->toRGB_convert_ctx != NULL) {
if ((ci->sws_pix_fmt != pix_fmt) ||
(ci->sws_width != width) || (ci->sws_height != height)) {
sws_freeContext(ci->toRGB_convert_ctx);
ci->toRGB_convert_ctx = NULL;
sws_freeContext(ci->fromRGB_convert_ctx);
ci->fromRGB_convert_ctx = NULL;
}
}
if (ci->toRGB_convert_ctx == NULL) {
ci->sws_pix_fmt = pix_fmt;
ci->sws_width = width;
ci->sws_height = height;
ci->toRGB_convert_ctx = sws_getContext(
ci->sws_width, ci->sws_height,
ci->sws_pix_fmt,
ci->sws_width, ci->sws_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");
exit(1);
}
ci->fromRGB_convert_ctx = sws_getContext(
ci->sws_width, ci->sws_height,
PIX_FMT_RGB24,
ci->sws_width, ci->sws_height,
ci->sws_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");
exit(1);
}
}
// 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, ci->sws_height,
picture1.data, picture1.linesize);
pict = &picture1;
}
/* Insert filter code here */
if (pix_fmt != PIX_FMT_RGB24) {
sws_scale(ci->fromRGB_convert_ctx,
picture1.data, picture1.linesize, 0, ci->sws_height,
picture->data, picture->linesize);
}
av_free(buf);
}
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