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 #include <framework/mlt_producer.h>
  25
  26 // ffmpeg Header files
  27 #include <avformat.h>
  28 #ifdef SWSCALE
  29 #include <swscale.h>
  30 #endif
  31
  32 #if LIBAVUTIL_VERSION_INT < (50<<16)
  33 #define PIX_FMT_YUYV422 PIX_FMT_YUV422
  34 #endif
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38
  39 #if 0 // This test might come in handy elsewhere someday.
  40 static int is_big_endian( )
  41 {
  42         union { int i; char c[ 4 ]; } big_endian_test;
  43         big_endian_test.i = 1;
  44
  45         return big_endian_test.c[ 0 ] != 1;
  46 }
  47 #endif
  48
  49 static int convert_mlt_to_av_cs( mlt_image_format format )
  50 {
  51         int value = 0;
  52
  53         switch( format )
  54         {
  55                 case mlt_image_rgb24:
  56                         value = PIX_FMT_RGB24;
  57                         break;
  58                 case mlt_image_rgb24a:
  59                 case mlt_image_opengl:
  60                         value = PIX_FMT_RGBA;
  61                         break;
  62                 case mlt_image_yuv422:
  63                         value = PIX_FMT_YUYV422;
  64                         break;
  65                 case mlt_image_yuv420p:
  66                         value = PIX_FMT_YUV420P;
  67                         break;
  68                 case mlt_image_none:
  69                         mlt_log_error( NULL, "[filter avcolor_space] Invalid format\n" );
  70                         break;
  71         }
  72
  73         return value;
  74 }
  75
  76 static void av_convert_image( mlt_properties properties, uint8_t *out, uint8_t *in, int out_fmt, int in_fmt, int width, int height )
  77 {
  78         AVPicture input;
  79         AVPicture output;
  80         avpicture_fill( &input, in, in_fmt, width, height );
  81         avpicture_fill( &output, out, out_fmt, width, height );
  82
  83 #ifdef SWSCALE
  84         int flags = SWS_BILINEAR | SWS_ACCURATE_RND;
  85         struct SwsContext *context = mlt_properties_get_data( properties, "avcolorspace.swscale", NULL );
  86         struct SwsContext *new_context;
  87
  88         if ( out_fmt == PIX_FMT_YUYV422 )
  89                 flags |= SWS_FULL_CHR_H_INP;
  90         else
  91                 flags |= SWS_FULL_CHR_H_INT;
  92 #ifdef USE_MMX
  93         flags |= SWS_CPU_CAPS_MMX;
  94 #endif
  95 #ifdef USE_SSE
  96         flags |= SWS_CPU_CAPS_MMX2;
  97 #endif
  98         new_context = sws_getCachedContext( context, width, height, in_fmt,
  99                 width, height, out_fmt, flags, NULL, NULL, NULL);
 100         if ( new_context != context )
 101                 mlt_properties_set_data( properties, "avcolorspace.swscale", new_context, 0, NULL, NULL );
 102         sws_scale( new_context, input.data, input.linesize, 0, height,
 103                 output.data, output.linesize);
 104
 105 #else
 106         img_convert( &output, out_fmt, &input, in_fmt, width, height );
 107 #endif
 108 }
 109
 110 /** Do it :-).
 111 */
 112
 113 static int convert_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, mlt_image_format output_format )
 114 {
 115         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 116         int width = mlt_properties_get_int( properties, "width" );
 117         int height = mlt_properties_get_int( properties, "height" );
 118         int error = 0;
 119
 120         if ( *format != output_format )
 121         {
 122                 mlt_log_debug( NULL, "[filter avcolor_space] %s -> %s\n",
 123                         mlt_image_format_name( *format ), mlt_image_format_name( output_format ) );
 124
 125                 int in_fmt = convert_mlt_to_av_cs( *format );
 126                 int out_fmt = convert_mlt_to_av_cs( output_format );
 127                 int size = avpicture_get_size( out_fmt, width, height );
 128                 uint8_t *output = mlt_pool_alloc( size );
 129
 130                 if ( *format == mlt_image_rgb24a || *format == mlt_image_opengl )
 131                 {
 132                         register int len = width * height;
 133                         uint8_t *alpha = mlt_pool_alloc( len );
 134
 135                         if ( alpha )
 136                         {
 137                                 // Extract the alpha mask from the RGBA image using Duff's Device
 138                                 register uint8_t *s = *image + 3; // start on the alpha component
 139                                 register uint8_t *d = alpha;
 140                                 register int n = ( len + 7 ) / 8;
 141
 142                                 switch ( len % 8 )
 143                                 {
 144                                         case 0: do { *d++ = *s; s += 4;
 145                                         case 7:          *d++ = *s; s += 4;
 146                                         case 6:          *d++ = *s; s += 4;
 147                                         case 5:          *d++ = *s; s += 4;
 148                                         case 4:          *d++ = *s; s += 4;
 149                                         case 3:          *d++ = *s; s += 4;
 150                                         case 2:          *d++ = *s; s += 4;
 151                                         case 1:          *d++ = *s; s += 4;
 152                                                         }
 153                                                         while ( --n > 0 );
 154                                 }
 155                                 mlt_properties_set_data( properties, "alpha", alpha, len, mlt_pool_release, NULL );
 156                                 frame->get_alpha_mask = NULL;
 157                         }
 158                 }
 159
 160                 // Update the output
 161                 mlt_producer producer = mlt_frame_get_original_producer( frame );
 162                 mlt_properties prod_props = MLT_PRODUCER_PROPERTIES( mlt_producer_cut_parent( producer ) );
 163                 av_convert_image( prod_props, output, *image, out_fmt, in_fmt, width, height );
 164                 *image = output;
 165                 *format = output_format;
 166                 mlt_properties_set_data( properties, "image", output, size, mlt_pool_release, NULL );
 167                 mlt_properties_set_int( properties, "format", output_format );
 168         }
 169         return error;
 170 }
 171
 172 /** Filter processing.
 173 */
 174
 175 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 176 {
 177         frame->convert_image = convert_image;
 178         return frame;
 179 }
 180
 181 static void filter_close( mlt_filter filter )
 182 {
 183 #ifdef SWSCALE
 184         struct SwsContext *context = mlt_properties_get_data( MLT_FILTER_PROPERTIES(filter), "avcolorspace.swscale", NULL );
 185         sws_freeContext( context );
 186 #endif
 187 }
 188
 189 /** Constructor for the filter.
 190 */
 191
 192 mlt_filter filter_avcolour_space_init( void *arg )
 193 {
 194 #ifdef SWSCALE
 195 #if (LIBSWSCALE_VERSION_INT >= ((0<<16)+(7<<8)+2))
 196         // Test to see if swscale accepts the arg as resolution
 197         if ( arg )
 198         {
 199                 int width = (int) arg;
 200                 struct SwsContext *context = sws_getContext( width, width, PIX_FMT_RGB32, 64, 64, PIX_FMT_RGB32, SWS_BILINEAR, NULL, NULL, NULL);
 201                 if ( context )
 202                         sws_freeContext( context );
 203                 else
 204                         return NULL;
 205         }
 206 #else
 207         return NULL;
 208 #endif
 209 #endif
 210         mlt_filter this = mlt_filter_new( );
 211         if ( this != NULL )
 212         {
 213                 this->process = filter_process;
 214                 this->close = filter_close;
 215         }
 216         return this;
 217 }
 218