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 "framehook.h"
32 static int sws_flags = SWS_BICUBIC;
34 /** Bi-directional pipe structure.
45 /** Create a bidirectional pipe for the given command.
48 static rwpipe *rwpipe_open( int argc, char *argv[] )
50 rwpipe *this = av_mallocz( sizeof( rwpipe ) );
64 #define COMMAND_SIZE 10240
65 char *command = av_mallocz( COMMAND_SIZE );
68 strcpy( command, "" );
69 for ( i = 0; i < argc; i ++ )
71 pstrcat( command, COMMAND_SIZE, argv[ i ] );
72 pstrcat( command, COMMAND_SIZE, " " );
75 dup2( output[ 0 ], STDIN_FILENO );
76 dup2( input[ 1 ], STDOUT_FILENO );
83 execl("/bin/sh", "sh", "-c", command, (char*)NULL );
91 this->reader = fdopen( input[ 0 ], "r" );
92 this->writer = fdopen( output[ 1 ], "w" );
99 /** Read data from the pipe.
102 static FILE *rwpipe_reader( rwpipe *this )
110 /** Write data to the pipe.
113 static FILE *rwpipe_writer( rwpipe *this )
121 /* Read a number from the pipe - assumes PNM style headers.
124 static int rwpipe_read_number( rwpipe *rw )
128 FILE *in = rwpipe_reader( rw );
134 while( c != EOF && !isdigit( c ) && c != '#' )
138 while( c != EOF && c != '\n' )
141 while ( c != EOF && !isdigit( c ) );
143 while( c != EOF && isdigit( c ) )
145 value = value * 10 + ( c - '0' );
152 /** Read a PPM P6 header.
155 static int rwpipe_read_ppm_header( rwpipe *rw, int *width, int *height )
158 FILE *in = rwpipe_reader( rw );
161 fgets( line, 3, in );
162 if ( !strncmp( line, "P6", 2 ) )
164 *width = rwpipe_read_number( rw );
165 *height = rwpipe_read_number( rw );
166 max = rwpipe_read_number( rw );
167 return max != 255 || *width <= 0 || *height <= 0;
172 /** Close the pipe and process.
175 static void rwpipe_close( rwpipe *this )
179 fclose( this->reader );
180 fclose( this->writer );
181 waitpid( this->pid, NULL, 0 );
186 /** Context info for this vhook - stores the pipe and image buffers.
197 // This vhook first converts frame to RGB ...
198 struct SwsContext *toRGB_convert_ctx;
199 // ... then processes it via a PPM command pipe ...
200 // ... and finally converts back frame from RGB to initial format
201 struct SwsContext *fromRGB_convert_ctx;
205 /** Initialise the context info for this vhook.
208 int Configure(void **ctxp, int argc, char *argv[])
212 *ctxp = av_mallocz(sizeof(ContextInfo));
213 if ( ctxp != NULL && argc > 1 )
215 ContextInfo *info = (ContextInfo *)*ctxp;
216 info->rw = rwpipe_open( argc - 1, &argv[ 1 ] );
226 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
229 ContextInfo *ci = (ContextInfo *) ctx;
232 AVPicture *pict = picture;
237 FILE *in = rwpipe_reader( ci->rw );
238 FILE *out = rwpipe_writer( ci->rw );
240 /* Check that we have a pipe to talk to. */
241 if ( in == NULL || out == NULL )
244 /* Convert to RGB24 if necessary */
245 if ( !err && pix_fmt != PIX_FMT_RGB24 )
247 int size = avpicture_get_size(PIX_FMT_RGB24, width, height);
249 if ( size != ci->size1 )
252 ci->buf1 = av_malloc(size);
254 err = ci->buf1 == NULL;
259 avpicture_fill(&picture1, ci->buf1, PIX_FMT_RGB24, width, height);
261 // if we already got a SWS context, let's realloc if is not re-useable
262 ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx,
263 width, height, pix_fmt,
264 width, height, PIX_FMT_RGB24,
265 sws_flags, NULL, NULL, NULL);
266 if (ci->toRGB_convert_ctx == NULL) {
267 av_log(NULL, AV_LOG_ERROR,
268 "Cannot initialize the toRGB conversion context\n");
272 // img_convert parameters are 2 first destination, then 4 source
273 // sws_scale parameters are context, 4 first source, then 2 destination
274 sws_scale(ci->toRGB_convert_ctx,
275 picture->data, picture->linesize, 0, height,
276 picture1.data, picture1.linesize);
282 /* Write out the PPM */
285 ptr = pict->data[ 0 ];
286 fprintf( out, "P6\n%d %d\n255\n", width, height );
287 for ( i = 0; !err && i < height; i ++ )
289 err = !fwrite( ptr, width * 3, 1, out );
290 ptr += pict->linesize[ 0 ];
296 /* Read the PPM returned. */
297 if ( !err && !rwpipe_read_ppm_header( ci->rw, &out_width, &out_height ) )
299 int size = avpicture_get_size(PIX_FMT_RGB24, out_width, out_height);
301 if ( size != ci->size2 )
304 ci->buf2 = av_malloc(size);
306 err = ci->buf2 == NULL;
311 avpicture_fill(&picture2, ci->buf2, PIX_FMT_RGB24, out_width, out_height);
312 ptr = picture2.data[ 0 ];
313 for ( i = 0; !err && i < out_height; i ++ )
315 err = !fread( ptr, out_width * 3, 1, in );
316 ptr += picture2.linesize[ 0 ];
321 /* Convert the returned PPM back to the input format */
324 /* The out_width/out_height returned from the PPM
325 * filter won't necessarily be the same as width and height
326 * but it will be scaled anyway to width/height.
328 av_log(NULL, AV_LOG_DEBUG,
329 "PPM vhook: Input dimensions: %d x %d Output dimensions: %d x %d\n",
330 width, height, out_width, out_height);
331 ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx,
332 out_width, out_height, PIX_FMT_RGB24,
333 width, height, pix_fmt,
334 sws_flags, NULL, NULL, NULL);
335 if (ci->fromRGB_convert_ctx == NULL) {
336 av_log(NULL, AV_LOG_ERROR,
337 "Cannot initialize the fromRGB conversion context\n");
341 // img_convert parameters are 2 first destination, then 4 source
342 // sws_scale parameters are context, 4 first source, then 2 destination
343 sws_scale(ci->fromRGB_convert_ctx,
344 picture2.data, picture2.linesize, 0, out_height,
345 picture->data, picture->linesize);
349 /** Clean up the effect.
352 void Release(void *ctx)
355 ci = (ContextInfo *) ctx;
359 rwpipe_close( ci->rw );
362 sws_freeContext(ci->toRGB_convert_ctx);
363 sws_freeContext(ci->fromRGB_convert_ctx);