* PPM Video Hook
* Copyright (c) 2003 Charles Yates
*
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <ctype.h>
-#include "framehook.h"
-#include "avformat.h"
+#include "libavutil/avstring.h"
+#include "libavformat/framehook.h"
+#include "libavformat/avformat.h"
+#include "libswscale/swscale.h"
+#undef fprintf
+
+static int sws_flags = SWS_BICUBIC;
/** Bi-directional pipe structure.
*/
/** Create a bidirectional pipe for the given command.
*/
-rwpipe *rwpipe_open( int argc, char *argv[] )
+static rwpipe *rwpipe_open( int argc, char *argv[] )
{
rwpipe *this = av_mallocz( sizeof( rwpipe ) );
strcpy( command, "" );
for ( i = 0; i < argc; i ++ )
{
- pstrcat( command, COMMAND_SIZE, argv[ i ] );
- pstrcat( command, COMMAND_SIZE, " " );
+ av_strlcat( command, argv[ i ], COMMAND_SIZE );
+ av_strlcat( command, " ", COMMAND_SIZE );
}
dup2( output[ 0 ], STDIN_FILENO );
close( output[ 1 ] );
execl("/bin/sh", "sh", "-c", command, (char*)NULL );
- exit( 255 );
+ _exit( 255 );
}
else
{
/** Read data from the pipe.
*/
-FILE *rwpipe_reader( rwpipe *this )
+static FILE *rwpipe_reader( rwpipe *this )
{
if ( this != NULL )
return this->reader;
/** Write data to the pipe.
*/
-FILE *rwpipe_writer( rwpipe *this )
+static FILE *rwpipe_writer( rwpipe *this )
{
if ( this != NULL )
return this->writer;
/* Read a number from the pipe - assumes PNM style headers.
*/
-int rwpipe_read_number( rwpipe *rw )
+static int rwpipe_read_number( rwpipe *rw )
{
int value = 0;
int c = 0;
/** Read a PPM P6 header.
*/
-int rwpipe_read_ppm_header( rwpipe *rw, int *width, int *height )
+static int rwpipe_read_ppm_header( rwpipe *rw, int *width, int *height )
{
char line[ 3 ];
FILE *in = rwpipe_reader( rw );
/** Close the pipe and process.
*/
-void rwpipe_close( rwpipe *this )
+static void rwpipe_close( rwpipe *this )
{
if ( this != NULL )
{
char *buf1;
int size2;
char *buf2;
+
+ // This vhook first converts frame to RGB ...
+ struct SwsContext *toRGB_convert_ctx;
+ // ... then processes it via a PPM command pipe ...
+ // ... and finally converts back frame from RGB to initial format
+ struct SwsContext *fromRGB_convert_ctx;
}
ContextInfo;
if ( argc > 1 )
{
*ctxp = av_mallocz(sizeof(ContextInfo));
- if ( ctxp != NULL && argc > 1 )
+ if ( *ctxp != NULL && argc > 1 )
{
ContextInfo *info = (ContextInfo *)*ctxp;
info->rw = rwpipe_open( argc - 1, &argv[ 1 ] );
if ( !err )
{
avpicture_fill(&picture1, ci->buf1, PIX_FMT_RGB24, width, height);
- if (img_convert(&picture1, PIX_FMT_RGB24, picture, pix_fmt, width, height) < 0)
- err = 1;
+
+ // 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;
}
}
/* Convert the returned PPM back to the input format */
if ( !err )
{
- /* Actually, this is wrong, since the out_width/out_height returned from the
- * filter won't necessarily be the same as width and height - img_resample
- * won't scale rgb24, so the only way out of this is to convert to something
- * that img_resample does like [which may or may not be pix_fmt], rescale
- * and finally convert to pix_fmt... slow, but would provide the most flexibility.
- *
- * Currently, we take the upper left width/height pixels from the filtered image,
- * smaller images are going to be corrupted or cause a crash.
- *
- * Finally, what should we do in case of this call failing? Up to now, failures
- * are gracefully ignored and the original image is returned - in this case, a
- * failure may corrupt the input.
+ /* The out_width/out_height returned from the PPM
+ * filter won't necessarily be the same as width and height
+ * but it will be scaled anyway to width/height.
*/
- if (img_convert(picture, pix_fmt, &picture2, PIX_FMT_RGB24, width, height) < 0)
- {
+ av_log(NULL, AV_LOG_DEBUG,
+ "PPM vhook: Input dimensions: %d x %d Output dimensions: %d x %d\n",
+ width, height, out_width, out_height);
+ ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx,
+ out_width, out_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,
+ picture2.data, picture2.linesize, 0, out_height,
+ picture->data, picture->linesize);
}
}
rwpipe_close( ci->rw );
av_free( ci->buf1 );
av_free( ci->buf2 );
+ sws_freeContext(ci->toRGB_convert_ctx);
+ sws_freeContext(ci->fromRGB_convert_ctx);
av_free(ctx);
}
}
projects / ffmpeg / blobdiff