3 * Copyright (c) 2003 Charles Yates
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include <sys/types.h>
28 #include "libavutil/avstring.h"
29 #include "libavformat/framehook.h"
30 #include "libavformat/avformat.h"
31 #include "libswscale/swscale.h"
34 static int sws_flags = SWS_BICUBIC;
36 /** Bi-directional pipe structure.
47 /** Create a bidirectional pipe for the given command.
50 static rwpipe *rwpipe_open( int argc, char *argv[] )
52 rwpipe *this = av_mallocz( sizeof( rwpipe ) );
69 #define COMMAND_SIZE 10240
70 char *command = av_mallocz( COMMAND_SIZE );
73 strcpy( command, "" );
74 for ( i = 0; i < argc; i ++ )
76 av_strlcat( command, argv[ i ], COMMAND_SIZE );
77 av_strlcat( command, " ", COMMAND_SIZE );
80 dup2( output[ 0 ], STDIN_FILENO );
81 dup2( input[ 1 ], STDOUT_FILENO );
88 execl("/bin/sh", "sh", "-c", command, (char*)NULL );
96 this->reader = fdopen( input[ 0 ], "r" );
97 this->writer = fdopen( output[ 1 ], "w" );
104 /** Read data from the pipe.
107 static FILE *rwpipe_reader( rwpipe *this )
115 /** Write data to the pipe.
118 static FILE *rwpipe_writer( rwpipe *this )
126 /* Read a number from the pipe - assumes PNM style headers.
129 static int rwpipe_read_number( rwpipe *rw )
133 FILE *in = rwpipe_reader( rw );
139 while( c != EOF && !isdigit( c ) && c != '#' )
143 while( c != EOF && c != '\n' )
146 while ( c != EOF && !isdigit( c ) );
148 while( c != EOF && isdigit( c ) )
150 value = value * 10 + ( c - '0' );
157 /** Read a PPM P6 header.
160 static int rwpipe_read_ppm_header( rwpipe *rw, int *width, int *height )
163 FILE *in = rwpipe_reader( rw );
166 if (!fgets( line, 3, in ))
169 if ( !strncmp( line, "P6", 2 ) )
171 *width = rwpipe_read_number( rw );
172 *height = rwpipe_read_number( rw );
173 max = rwpipe_read_number( rw );
174 return max != 255 || *width <= 0 || *height <= 0;
179 /** Close the pipe and process.
182 static void rwpipe_close( rwpipe *this )
186 fclose( this->reader );
187 fclose( this->writer );
188 waitpid( this->pid, NULL, 0 );
193 /** Context info for this vhook - stores the pipe and image buffers.
204 // This vhook first converts frame to RGB ...
205 struct SwsContext *toRGB_convert_ctx;
206 // ... then processes it via a PPM command pipe ...
207 // ... and finally converts back frame from RGB to initial format
208 struct SwsContext *fromRGB_convert_ctx;
212 /** Initialise the context info for this vhook.
215 int Configure(void **ctxp, int argc, char *argv[])
219 *ctxp = av_mallocz(sizeof(ContextInfo));
220 if ( *ctxp != NULL && argc > 1 )
222 ContextInfo *info = (ContextInfo *)*ctxp;
223 info->rw = rwpipe_open( argc - 1, &argv[ 1 ] );
233 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
236 ContextInfo *ci = (ContextInfo *) ctx;
239 AVPicture *pict = picture;
244 FILE *in = rwpipe_reader( ci->rw );
245 FILE *out = rwpipe_writer( ci->rw );
247 /* Check that we have a pipe to talk to. */
248 if ( in == NULL || out == NULL )
251 /* Convert to RGB24 if necessary */
252 if ( !err && pix_fmt != PIX_FMT_RGB24 )
254 int size = avpicture_get_size(PIX_FMT_RGB24, width, height);
256 if ( size != ci->size1 )
259 ci->buf1 = av_malloc(size);
261 err = ci->buf1 == NULL;
266 avpicture_fill(&picture1, ci->buf1, PIX_FMT_RGB24, width, height);
268 // if we already got a SWS context, let's realloc if is not re-useable
269 ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx,
270 width, height, pix_fmt,
271 width, height, PIX_FMT_RGB24,
272 sws_flags, NULL, NULL, NULL);
273 if (ci->toRGB_convert_ctx == NULL) {
274 av_log(NULL, AV_LOG_ERROR,
275 "Cannot initialize the toRGB conversion context\n");
279 // img_convert parameters are 2 first destination, then 4 source
280 // sws_scale parameters are context, 4 first source, then 2 destination
281 sws_scale(ci->toRGB_convert_ctx,
282 picture->data, picture->linesize, 0, height,
283 picture1.data, picture1.linesize);
289 /* Write out the PPM */
292 ptr = pict->data[ 0 ];
293 fprintf( out, "P6\n%d %d\n255\n", width, height );
294 for ( i = 0; !err && i < height; i ++ )
296 err = !fwrite( ptr, width * 3, 1, out );
297 ptr += pict->linesize[ 0 ];
303 /* Read the PPM returned. */
304 if ( !err && !rwpipe_read_ppm_header( ci->rw, &out_width, &out_height ) )
306 int size = avpicture_get_size(PIX_FMT_RGB24, out_width, out_height);
308 if ( size != ci->size2 )
311 ci->buf2 = av_malloc(size);
313 err = ci->buf2 == NULL;
318 avpicture_fill(&picture2, ci->buf2, PIX_FMT_RGB24, out_width, out_height);
319 ptr = picture2.data[ 0 ];
320 for ( i = 0; !err && i < out_height; i ++ )
322 err = !fread( ptr, out_width * 3, 1, in );
323 ptr += picture2.linesize[ 0 ];
328 /* Convert the returned PPM back to the input format */
331 /* The out_width/out_height returned from the PPM
332 * filter won't necessarily be the same as width and height
333 * but it will be scaled anyway to width/height.
335 av_log(NULL, AV_LOG_DEBUG,
336 "PPM vhook: Input dimensions: %d x %d Output dimensions: %d x %d\n",
337 width, height, out_width, out_height);
338 ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx,
339 out_width, out_height, PIX_FMT_RGB24,
340 width, height, pix_fmt,
341 sws_flags, NULL, NULL, NULL);
342 if (ci->fromRGB_convert_ctx == NULL) {
343 av_log(NULL, AV_LOG_ERROR,
344 "Cannot initialize the fromRGB conversion context\n");
348 // img_convert parameters are 2 first destination, then 4 source
349 // sws_scale parameters are context, 4 first source, then 2 destination
350 sws_scale(ci->fromRGB_convert_ctx,
351 picture2.data, picture2.linesize, 0, out_height,
352 picture->data, picture->linesize);
356 /** Clean up the effect.
359 void Release(void *ctx)
362 ci = (ContextInfo *) ctx;
366 rwpipe_close( ci->rw );
369 sws_freeContext(ci->toRGB_convert_ctx);
370 sws_freeContext(ci->fromRGB_convert_ctx);