2 * filter_swscale.c -- image scaling filter
3 * Copyright (C) 2008-2009 Ushodaya Enterprises Limited
4 * Author: Dan Dennedy <dan@dennedy.org>
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.
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.
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
21 #include <framework/mlt_filter.h>
22 #include <framework/mlt_frame.h>
23 #include <framework/mlt_factory.h>
26 // ffmpeg Header files
27 #include <libavformat/avformat.h>
28 #include <libswscale/swscale.h>
34 static inline int convert_mlt_to_av_cs( mlt_image_format format )
41 value = PIX_FMT_RGB24;
43 case mlt_image_rgb24a:
44 case mlt_image_opengl:
47 case mlt_image_yuv422:
48 value = PIX_FMT_YUYV422;
50 case mlt_image_yuv420p:
51 value = PIX_FMT_YUV420P;
54 fprintf( stderr, "Invalid format...\n" );
61 static int filter_scale( mlt_frame frame, uint8_t **image, mlt_image_format *format, int iwidth, int iheight, int owidth, int oheight )
64 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
66 // Get the requested interpolation method
67 char *interps = mlt_properties_get( properties, "rescale.interp" );
69 // Convert to the SwScale flag
70 int interp = SWS_BILINEAR;
71 if ( strcmp( interps, "nearest" ) == 0 || strcmp( interps, "neighbor" ) == 0 )
73 else if ( strcmp( interps, "tiles" ) == 0 || strcmp( interps, "fast_bilinear" ) == 0 )
74 interp = SWS_FAST_BILINEAR;
75 else if ( strcmp( interps, "bilinear" ) == 0 )
76 interp = SWS_BILINEAR;
77 else if ( strcmp( interps, "bicubic" ) == 0 )
79 else if ( strcmp( interps, "bicublin" ) == 0 )
80 interp = SWS_BICUBLIN;
81 else if ( strcmp( interps, "gauss" ) == 0 )
83 else if ( strcmp( interps, "sinc" ) == 0 )
85 else if ( strcmp( interps, "hyper" ) == 0 || strcmp( interps, "lanczos" ) == 0 )
87 else if ( strcmp( interps, "spline" ) == 0 )
89 interp |= SWS_ACCURATE_RND;
91 // Determine the bytes per pixel
93 mlt_image_format_size( *format, 0, 0, &bpp );
95 // Set swscale flags to get good quality
98 case mlt_image_yuv422:
99 interp |= SWS_FULL_CHR_H_INP;
101 case mlt_image_rgb24:
102 interp |= SWS_FULL_CHR_H_INT;
104 case mlt_image_rgb24a:
105 case mlt_image_opengl:
106 interp |= SWS_FULL_CHR_H_INT;
109 // XXX: we only know how to rescale packed formats
113 interp |= SWS_CPU_CAPS_MMX;
116 interp |= SWS_CPU_CAPS_MMX2;
119 // Convert the pixel formats
120 int avformat = convert_mlt_to_av_cs( *format );
122 // Fill out the AVPictures
125 uint8_t *outbuf = mlt_pool_alloc( owidth * ( oheight + 1 ) * bpp );
126 avpicture_fill( &input, *image, avformat, iwidth, iheight );
127 avpicture_fill( &output, outbuf, avformat, owidth, oheight );
129 // Create the context and output image
130 owidth = owidth > 5120 ? 5120 : owidth;
131 struct SwsContext *context = sws_getContext( iwidth, iheight, avformat, owidth, oheight, avformat, interp, NULL, NULL, NULL);
134 owidth = owidth > 2048 ? 2048 : owidth;
135 context = sws_getContext( iwidth, iheight, avformat, owidth, oheight, avformat, interp, NULL, NULL, NULL);
139 // Perform the scaling
140 sws_scale( context, (const uint8_t* const*) input.data, input.linesize, 0, iheight, output.data, output.linesize);
141 sws_freeContext( context );
143 // Now update the frame
144 mlt_frame_set_image( frame, output.data[0], owidth * ( oheight + 1 ) * bpp, mlt_pool_release );
147 *image = output.data[0];
149 // Scale the alpha channel only if exists and not correct size
151 mlt_properties_get_data( properties, "alpha", &alpha_size );
152 if ( alpha_size > 0 && alpha_size != ( owidth * oheight ) )
154 // Create the context and output image
155 uint8_t *alpha = mlt_frame_get_alpha_mask( frame );
158 avformat = PIX_FMT_GRAY8;
159 struct SwsContext *context = sws_getContext( iwidth, iheight, avformat, owidth, oheight, avformat, interp, NULL, NULL, NULL);
160 avpicture_fill( &input, alpha, avformat, iwidth, iheight );
161 outbuf = mlt_pool_alloc( owidth * oheight );
162 avpicture_fill( &output, outbuf, avformat, owidth, oheight );
164 // Perform the scaling
165 sws_scale( context, (const uint8_t* const*) input.data, input.linesize, 0, iheight, output.data, output.linesize);
166 sws_freeContext( context );
168 // Set it back on the frame
169 mlt_frame_set_alpha( frame, output.data[0], owidth * oheight, mlt_pool_release );
181 /** Constructor for the filter.
184 mlt_filter filter_swscale_init( mlt_profile profile, void *arg )
186 // Test to see if swscale accepts the arg as resolution
189 int *width = (int*) arg;
192 struct SwsContext *context = sws_getContext( *width, *width, PIX_FMT_RGB32, 64, 64, PIX_FMT_RGB32, SWS_BILINEAR, NULL, NULL, NULL);
194 sws_freeContext( context );
199 // Create a new scaler
200 mlt_filter filter = mlt_factory_filter( profile, "rescale", NULL );
202 // If successful, then initialise it
203 if ( filter != NULL )
205 // Get the properties
206 mlt_properties properties = MLT_FILTER_PROPERTIES( filter );
208 // Set the inerpolation
209 mlt_properties_set( properties, "interpolation", "bilinear" );
212 mlt_properties_set_data( properties, "method", filter_scale, 0, NULL, NULL );