3 * Copyright (c) 2003 Charles Yates
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <sys/types.h>
26 #include "framehook.h"
28 /** Bi-directional pipe structure.
39 /** Create a bidirectional pipe for the given command.
42 rwpipe *rwpipe_open( int argc, char *argv[] )
44 rwpipe *this = av_mallocz( sizeof( rwpipe ) );
58 char *command = av_mallocz( 10240 );
61 strcpy( command, "" );
62 for ( i = 0; i < argc; i ++ )
64 strcat( command, argv[ i ] );
65 strcat( command, " " );
68 dup2( output[ 0 ], STDIN_FILENO );
69 dup2( input[ 1 ], STDOUT_FILENO );
76 execl("/bin/sh", "sh", "-c", command, NULL );
84 this->reader = fdopen( input[ 0 ], "r" );
85 this->writer = fdopen( output[ 1 ], "w" );
92 /** Read data from the pipe.
95 FILE *rwpipe_reader( rwpipe *this )
103 /** Write data to the pipe.
106 FILE *rwpipe_writer( rwpipe *this )
114 /* Read a number from the pipe - assumes PNM style headers.
117 int rwpipe_read_number( rwpipe *rw )
121 FILE *in = rwpipe_reader( rw );
127 while( c != EOF && !isdigit( c ) && c != '#' )
131 while( c != EOF && c != '\n' )
134 while ( c != EOF && !isdigit( c ) );
136 while( c != EOF && isdigit( c ) )
138 value = value * 10 + ( c - '0' );
145 /** Read a PPM P6 header.
148 int rwpipe_read_ppm_header( rwpipe *rw, int *width, int *height )
151 FILE *in = rwpipe_reader( rw );
154 fgets( line, 3, in );
155 if ( !strncmp( line, "P6", 2 ) )
157 *width = rwpipe_read_number( rw );
158 *height = rwpipe_read_number( rw );
159 max = rwpipe_read_number( rw );
160 return max != 255 || *width <= 0 || *height <= 0;
165 /** Close the pipe and process.
168 void rwpipe_close( rwpipe *this )
172 fclose( this->reader );
173 fclose( this->writer );
174 waitpid( this->pid, NULL, 0 );
179 /** Context info for this vhook - stores the pipe and image buffers.
192 /** Initialise the context info for this vhook.
195 int Configure(void **ctxp, int argc, char *argv[])
199 *ctxp = av_mallocz(sizeof(ContextInfo));
200 if ( ctxp != NULL && argc > 1 )
202 ContextInfo *info = (ContextInfo *)*ctxp;
203 info->rw = rwpipe_open( argc - 1, &argv[ 1 ] );
213 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
216 ContextInfo *ci = (ContextInfo *) ctx;
219 AVPicture *pict = picture;
224 FILE *in = rwpipe_reader( ci->rw );
225 FILE *out = rwpipe_writer( ci->rw );
227 /* Check that we have a pipe to talk to. */
228 if ( in == NULL || out == NULL )
231 /* Convert to RGB24 if necessary */
232 if ( !err && pix_fmt != PIX_FMT_RGB24 )
234 int size = avpicture_get_size(PIX_FMT_RGB24, width, height);
236 if ( size != ci->size1 )
239 ci->buf1 = av_malloc(size);
241 err = ci->buf1 == NULL;
246 avpicture_fill(&picture1, ci->buf1, PIX_FMT_RGB24, width, height);
247 if (img_convert(&picture1, PIX_FMT_RGB24, picture, pix_fmt, width, height) < 0)
253 /* Write out the PPM */
256 ptr = pict->data[ 0 ];
257 fprintf( out, "P6\n%d %d\n255\n", width, height );
258 for ( i = 0; !err && i < height; i ++ )
260 err = !fwrite( ptr, width * 3, 1, out );
261 ptr += pict->linesize[ 0 ];
267 /* Read the PPM returned. */
268 if ( !err && !rwpipe_read_ppm_header( ci->rw, &out_width, &out_height ) )
270 int size = avpicture_get_size(PIX_FMT_RGB24, out_width, out_height);
272 if ( size != ci->size2 )
275 ci->buf2 = av_malloc(size);
277 err = ci->buf2 == NULL;
282 avpicture_fill(&picture2, ci->buf2, PIX_FMT_RGB24, out_width, out_height);
283 ptr = picture2.data[ 0 ];
284 for ( i = 0; !err && i < out_height; i ++ )
286 err = !fread( ptr, out_width * 3, 1, in );
287 ptr += picture2.linesize[ 0 ];
292 /* Convert the returned PPM back to the input format */
295 /* Actually, this is wrong, since the out_width/out_height returned from the
296 * filter won't necessarily be the same as width and height - img_resample
297 * won't scale rgb24, so the only way out of this is to convert to something
298 * that img_resample does like [which may or may not be pix_fmt], rescale
299 * and finally convert to pix_fmt... slow, but would provide the most flexibility.
301 * Currently, we take the upper left width/height pixels from the filtered image,
302 * smaller images are going to be corrupted or cause a crash.
304 * Finally, what should we do in case of this call failing? Up to now, failures
305 * are gracefully ignored and the original image is returned - in this case, a
306 * failure may corrupt the input.
308 if (img_convert(picture, pix_fmt, &picture2, PIX_FMT_RGB24, width, height) < 0)
314 /** Clean up the effect.
317 void Release(void *ctx)
320 ci = (ContextInfo *) ctx;
324 rwpipe_close( ci->rw );