git.sesse.net Git - mlt/blob - src/modules/avformat/filter_avcolour_space.c

   1 /*
   2  * filter_avcolour_space.c -- Colour space filter
   3  * Copyright (C) 2004-2005 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <framework/mlt_filter.h>
  22 #include <framework/mlt_frame.h>
  23 #include <framework/mlt_log.h>
  24
  25 // ffmpeg Header files
  26 #include <avformat.h>
  27 #ifdef SWSCALE
  28 #include <swscale.h>
  29 #endif
  30
  31 #if LIBAVUTIL_VERSION_INT < (50<<16)
  32 #define PIX_FMT_YUYV422 PIX_FMT_YUV422
  33 #endif
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37
  38 #if 0 // This test might come in handy elsewhere someday.
  39 static int is_big_endian( )
  40 {
  41         union { int i; char c[ 4 ]; } big_endian_test;
  42         big_endian_test.i = 1;
  43
  44         return big_endian_test.c[ 0 ] != 1;
  45 }
  46 #endif
  47
  48 static int convert_mlt_to_av_cs( mlt_image_format format )
  49 {
  50         int value = 0;
  51
  52         switch( format )
  53         {
  54                 case mlt_image_rgb24:
  55                         value = PIX_FMT_RGB24;
  56                         break;
  57                 case mlt_image_rgb24a:
  58                 case mlt_image_opengl:
  59                         value = PIX_FMT_RGBA;
  60                         break;
  61                 case mlt_image_yuv422:
  62                         value = PIX_FMT_YUYV422;
  63                         break;
  64                 case mlt_image_yuv420p:
  65                         value = PIX_FMT_YUV420P;
  66                         break;
  67                 case mlt_image_none:
  68                         mlt_log_error( NULL, "[filter avcolor_space] Invalid format\n" );
  69                         break;
  70         }
  71
  72         return value;
  73 }
  74
  75 static void av_convert_image( uint8_t *out, uint8_t *in, int out_fmt, int in_fmt, int width, int height )
  76 {
  77         AVPicture input;
  78         AVPicture output;
  79         avpicture_fill( &input, in, in_fmt, width, height );
  80         avpicture_fill( &output, out, out_fmt, width, height );
  81 #ifdef SWSCALE
  82         struct SwsContext *context = sws_getContext( width, height, in_fmt,
  83                 width, height, out_fmt, SWS_FAST_BILINEAR, NULL, NULL, NULL);
  84         sws_scale( context, input.data, input.linesize, 0, height,
  85                 output.data, output.linesize);
  86         sws_freeContext( context );
  87 #else
  88         img_convert( &output, out_fmt, &input, in_fmt, width, height );
  89 #endif
  90 }
  91
  92 /** Do it :-).
  93 */
  94
  95 static int convert_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, mlt_image_format output_format )
  96 {
  97         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  98         int width = mlt_properties_get_int( properties, "width" );
  99         int height = mlt_properties_get_int( properties, "height" );
 100         int error = 0;
 101
 102         if ( *format != output_format )
 103         {
 104                 mlt_log_debug( NULL, "[filter avcolor_space] %s -> %s\n",
 105                         mlt_image_format_name( *format ), mlt_image_format_name( output_format ) );
 106
 107                 int in_fmt = convert_mlt_to_av_cs( *format );
 108                 int out_fmt = convert_mlt_to_av_cs( output_format );
 109                 int size = avpicture_get_size( out_fmt, width, height );
 110                 uint8_t *output = mlt_pool_alloc( size );
 111
 112                 if ( *format == mlt_image_rgb24a || *format == mlt_image_opengl )
 113                 {
 114                         register int len = width * height;
 115                         uint8_t *alpha = mlt_pool_alloc( len );
 116
 117                         if ( alpha )
 118                         {
 119                                 // Extract the alpha mask from the RGBA image using Duff's Device
 120                                 register uint8_t *s = *image + 3; // start on the alpha component
 121                                 register uint8_t *d = alpha;
 122                                 register int n = ( len + 7 ) / 8;
 123
 124                                 switch ( len % 8 )
 125                                 {
 126                                         case 0: do { *d++ = *s; s += 4;
 127                                         case 7:          *d++ = *s; s += 4;
 128                                         case 6:          *d++ = *s; s += 4;
 129                                         case 5:          *d++ = *s; s += 4;
 130                                         case 4:          *d++ = *s; s += 4;
 131                                         case 3:          *d++ = *s; s += 4;
 132                                         case 2:          *d++ = *s; s += 4;
 133                                         case 1:          *d++ = *s; s += 4;
 134                                                         }
 135                                                         while ( --n > 0 );
 136                                 }
 137                                 mlt_properties_set_data( properties, "alpha", alpha, len, mlt_pool_release, NULL );
 138                                 frame->get_alpha_mask = NULL;
 139                         }
 140                 }
 141
 142                 // Update the output
 143                 av_convert_image( output, *image, out_fmt, in_fmt, width, height );
 144                 *image = output;
 145                 *format = output_format;
 146                 mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
 147                 mlt_properties_set_int( properties, "format", output_format );
 148         }
 149         return error;
 150 }
 151
 152 /** Filter processing.
 153 */
 154
 155 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 156 {
 157         frame->convert_image = convert_image;
 158         return frame;
 159 }
 160
 161 /** Constructor for the filter.
 162 */
 163
 164 mlt_filter filter_avcolour_space_init( void *arg )
 165 {
 166         // Test to see if swscale accepts the arg as resolution
 167         if ( arg )
 168         {
 169                 int width = (int) arg;
 170                 struct SwsContext *context = sws_getContext( width, width, PIX_FMT_RGB32, 64, 64, PIX_FMT_RGB32, SWS_BILINEAR, NULL, NULL, NULL);
 171                 if ( context )
 172                         sws_freeContext( context );
 173                 else
 174                         return NULL;
 175         }
 176
 177         mlt_filter this = mlt_filter_new( );
 178         if ( this != NULL )
 179                 this->process = filter_process;
 180         return this;
 181 }
 182