2 * mlt_frame.c -- interface for all frame classes
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program 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
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 #include "mlt_frame.h"
29 mlt_image_format vfmt;
34 mlt_audio_format afmt;
39 static frame_test test_card = { mlt_image_none, 0, 0, NULL, NULL, mlt_audio_none, NULL };
41 /** Constructor for a frame.
44 mlt_frame mlt_frame_init( )
47 mlt_frame this = calloc( sizeof( struct mlt_frame_s ), 1 );
51 // Initialise the properties
52 mlt_properties properties = &this->parent;
53 mlt_properties_init( properties, this );
55 // Set default properties on the frame
56 mlt_properties_set_timecode( properties, "timecode", 0.0 );
57 mlt_properties_set_data( properties, "image", NULL, 0, NULL, NULL );
58 mlt_properties_set_int( properties, "width", 720 );
59 mlt_properties_set_int( properties, "height", 576 );
60 mlt_properties_set_double( properties, "aspect_ratio", 4.0 / 3.0 );
61 mlt_properties_set_data( properties, "audio", NULL, 0, NULL, NULL );
62 mlt_properties_set_data( properties, "alpha", NULL, 0, NULL, NULL );
67 /** Fetch the frames properties.
70 mlt_properties mlt_frame_properties( mlt_frame this )
75 /** Check if we have a way to derive something other than a test card.
78 int mlt_frame_is_test_card( mlt_frame this )
80 return this->stack_get_image_size == 0;
83 /** Get the aspect ratio of the frame.
86 double mlt_frame_get_aspect_ratio( mlt_frame this )
88 mlt_properties properties = mlt_frame_properties( this );
89 return mlt_properties_get_double( properties, "aspect_ratio" );
92 /** Set the aspect ratio of the frame.
95 int mlt_frame_set_aspect_ratio( mlt_frame this, double value )
97 mlt_properties properties = mlt_frame_properties( this );
98 return mlt_properties_set_double( properties, "aspect_ratio", value );
101 /** Get the timecode of this frame.
104 mlt_timecode mlt_frame_get_timecode( mlt_frame this )
106 mlt_properties properties = mlt_frame_properties( this );
107 return mlt_properties_get_timecode( properties, "timecode" );
110 /** Set the timecode of this frame.
113 int mlt_frame_set_timecode( mlt_frame this, mlt_timecode value )
115 mlt_properties properties = mlt_frame_properties( this );
116 return mlt_properties_set_timecode( properties, "timecode", value );
119 /** Stack a get_image callback.
122 int mlt_frame_push_get_image( mlt_frame this, mlt_get_image get_image )
124 int ret = this->stack_get_image_size >= 10;
126 this->stack_get_image[ this->stack_get_image_size ++ ] = get_image;
130 /** Pop a get_image callback.
133 mlt_get_image mlt_frame_pop_get_image( mlt_frame this )
135 mlt_get_image result = NULL;
136 if ( this->stack_get_image_size > 0 )
137 result = this->stack_get_image[ -- this->stack_get_image_size ];
144 int mlt_frame_push_frame( mlt_frame this, mlt_frame that )
146 int ret = this->stack_frame_size >= 10;
148 this->stack_frame[ this->stack_frame_size ++ ] = that;
155 mlt_frame mlt_frame_pop_frame( mlt_frame this )
157 mlt_frame result = NULL;
158 if ( this->stack_frame_size > 0 )
159 result = this->stack_frame[ -- this->stack_frame_size ];
163 int mlt_frame_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
165 mlt_properties properties = mlt_frame_properties( this );
166 mlt_get_image get_image = mlt_frame_pop_get_image( this );
168 if ( get_image != NULL )
170 return get_image( this, buffer, format, width, height, writable );
172 else if ( mlt_properties_get_data( properties, "image", NULL ) != NULL )
174 *format = mlt_image_yuv422;
175 *buffer = mlt_properties_get_data( properties, "image", NULL );
176 *width = mlt_properties_get_int( properties, "width" );
177 *height = mlt_properties_get_int( properties, "height" );
181 if ( test_card.vfmt != *format )
186 test_card.vfmt = *format;
187 test_card.width = *width == 0 ? 720 : *width;
188 test_card.height = *height == 0 ? 576 : *height;
194 case mlt_image_rgb24:
195 test_card.image = realloc( test_card.image, test_card.width * test_card.height * 3 );
196 memset( test_card.image, 255, test_card.width * test_card.height * 3 );
198 case mlt_image_rgb24a:
199 test_card.image = realloc( test_card.image, test_card.width * test_card.height * 4 );
200 memset( test_card.image, 255, test_card.width * test_card.height * 4 );
202 case mlt_image_yuv422:
203 test_card.image = realloc( test_card.image, test_card.width * test_card.height * 2 );
205 q = test_card.image + test_card.width * test_card.height * 2;
212 case mlt_image_yuv420p:
213 test_card.image = realloc( test_card.image, test_card.width * test_card.height * 3 / 2 );
214 memset( test_card.image, 255, test_card.width * test_card.height * 3 / 2 );
219 *width = test_card.width;
220 *height = test_card.height;
221 *buffer = test_card.image;
227 uint8_t *mlt_frame_get_alpha_mask( mlt_frame this )
229 if ( this->get_alpha_mask != NULL )
230 return this->get_alpha_mask( this );
231 return test_card.alpha;
234 int mlt_frame_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
236 if ( this->get_audio != NULL )
238 return this->get_audio( this, buffer, format, frequency, channels, samples );
242 if ( test_card.afmt != *format )
244 test_card.afmt = *format;
245 test_card.audio = realloc( test_card.audio, 1920 * 2 * sizeof( int16_t ) );
246 memset( test_card.audio, 0, 1920 * 2 * sizeof( int16_t ) );
249 *buffer = test_card.audio;
257 void mlt_frame_close( mlt_frame this )
259 mlt_frame frame = mlt_frame_pop_frame( this );
261 while ( frame != NULL )
263 mlt_frame_close( frame);
264 frame = mlt_frame_pop_frame( this );
267 mlt_properties_close( &this->parent );
272 /***** convenience functions *****/
273 #define RGB2YUV(r, g, b, y, u, v)\
274 y = (306*r + 601*g + 117*b) >> 10;\
275 u = ((-172*r - 340*g + 512*b) >> 10) + 128;\
276 v = ((512*r - 429*g - 83*b) >> 10) + 128;\
280 y = y > 255 ? 255 : y;\
281 u = u > 255 ? 255 : u;\
282 v = v > 255 ? 255 : v
284 int mlt_convert_rgb24a_to_yuv422( uint8_t *rgba, int width, int height, int stride, uint8_t *yuv, uint8_t *alpha )
287 register int y0, y1, u0, u1, v0, v1;
288 register int r, g, b;
289 register uint8_t *d = yuv;
292 for ( i = 0; i < height; i++ )
294 register uint8_t *s = rgba + ( stride * i );
295 for ( j = 0; j < ( width / 2 ); j++ )
301 RGB2YUV (r, g, b, y0, u0 , v0);
306 RGB2YUV (r, g, b, y1, u1 , v1);
318 RGB2YUV (r, g, b, y0, u0 , v0);
326 int mlt_convert_rgb24_to_yuv422( uint8_t *rgb, int width, int height, int stride, uint8_t *yuv )
329 register int y0, y1, u0, u1, v0, v1;
330 register int r, g, b;
331 register uint8_t *d = yuv;
334 for ( i = 0; i < height; i++ )
336 register uint8_t *s = rgb + ( stride * i );
337 for ( j = 0; j < ( width / 2 ); j++ )
342 RGB2YUV (r, g, b, y0, u0 , v0);
346 RGB2YUV (r, g, b, y1, u1 , v1);
357 RGB2YUV (r, g, b, y0, u0 , v0);
365 int mlt_frame_composite_yuv( mlt_frame this, mlt_frame that, int x, int y, float weight )
369 int width_src, height_src;
370 int width_dest, height_dest;
371 mlt_image_format format_src, format_dest;
372 uint8_t *p_src, *p_dest;
378 format_src = mlt_image_yuv422;
379 format_dest = mlt_image_yuv422;
381 mlt_frame_get_image( this, &p_dest, &format_dest, &width_dest, &height_dest, 1 /* writable */ );
382 mlt_frame_get_image( that, &p_src, &format_src, &width_src, &height_src, 0 /* writable */ );
386 stride_src = width_src * 2;
387 stride_dest = width_dest * 2;
388 uint8_t *lower = p_dest;
389 uint8_t *upper = p_dest + height_dest * stride_dest;
391 p_dest += ( y * stride_dest ) + ( x * 2 );
399 uint8_t *z = mlt_frame_get_alpha_mask( that );
401 for ( i = 0; i < height_src; i++ )
407 for ( j = 0; j < width_src; j ++ )
409 if ( q >= lower && q < upper && j >= x_start && j < x_end )
413 uint8_t a = ( z == NULL ) ? 255 : *z ++;
414 float value = ( weight * ( float ) a / 255.0 );
415 *o ++ = (uint8_t)( y * value + *q++ * ( 1 - value ) );
416 *o ++ = (uint8_t)( uv * value + *q++ * ( 1 - value ) );
429 p_dest += stride_dest;
435 void mlt_resize_yuv422( uint8_t *output, int owidth, int oheight, uint8_t *input, int iwidth, int iheight )
438 int istride = iwidth * 2;
439 int ostride = owidth * 2;
441 // Coordinates (0,0 is middle of output)
445 int out_x_range = owidth / 2;
446 int out_y_range = oheight / 2;
447 int in_x_range = iwidth / 2;
448 int in_y_range = iheight / 2;
451 uint8_t *out_line = output;
454 // Calculate a middle and possibly invalid pointer in the input
455 uint8_t *in_middle = input + istride * in_y_range + in_x_range * 2;
456 int in_line = - out_y_range * istride - out_x_range * 2;
459 // Loop for the entirety of our output height.
460 for ( y = - out_y_range; y < out_y_range ; y ++ )
462 // Start at the beginning of the line
465 // Point the start of the current input line (NB: can be out of range)
468 // Loop for the entirety of our output row.
469 for ( x = - out_x_range; x < out_x_range; x ++ )
471 // Check if x and y are in the valid input range.
472 if ( abs( x ) < in_x_range && abs( y ) < in_y_range )
474 // We're in the input range for this row.
475 *out_ptr ++ = *( in_middle + in_ptr ++ );
476 *out_ptr ++ = *( in_middle + in_ptr ++ );
480 // We're not in the input range for this row.
487 // Move to next output line
490 // Move to next input line
495 /** A resizing function for yuv422 frames - this does not rescale, but simply
496 resizes. It assumes yuv422 images available on the frame so use with care.
499 uint8_t *mlt_frame_resize_yuv422( mlt_frame this, int owidth, int oheight )
502 mlt_properties properties = mlt_frame_properties( this );
504 // Get the input image, width and height
505 uint8_t *input = mlt_properties_get_data( properties, "image", NULL );
506 int iwidth = mlt_properties_get_int( properties, "width" );
507 int iheight = mlt_properties_get_int( properties, "height" );
509 // If width and height are correct, don't do anything
510 if ( iwidth != owidth || iheight != oheight )
512 // Create the output image
513 uint8_t *output = malloc( owidth * oheight * 2 );
515 // Call the generic resize
516 mlt_resize_yuv422( output, owidth, oheight, input, iwidth, iheight );
518 // Now update the frame
519 mlt_properties_set_data( properties, "image", output, owidth * oheight * 2, free, NULL );
520 mlt_properties_set_int( properties, "width", owidth );
521 mlt_properties_set_int( properties, "height", oheight );
527 // No change, return input
531 /** A rescaling function for yuv422 frames - low quality, and provided for testing
532 only. It assumes yuv422 images available on the frame so use with care.
535 uint8_t *mlt_frame_rescale_yuv422( mlt_frame this, int owidth, int oheight )
538 mlt_properties properties = mlt_frame_properties( this );
540 // Get the input image, width and height
541 uint8_t *input = mlt_properties_get_data( properties, "image", NULL );
542 int iwidth = mlt_properties_get_int( properties, "width" );
543 int iheight = mlt_properties_get_int( properties, "height" );
545 // If width and height are correct, don't do anything
546 if ( iwidth != owidth || iheight != oheight )
548 // Create the output image
549 uint8_t *output = malloc( owidth * oheight * 2 );
552 int istride = iwidth * 2;
553 int ostride = owidth * 2;
555 // Coordinates (0,0 is middle of output)
558 // Derived coordinates
562 int out_x_range = owidth / 2;
563 int out_y_range = oheight / 2;
564 int in_x_range = iwidth / 2;
565 int in_y_range = iheight / 2;
568 uint8_t *out_line = output;
571 // Calculate a middle pointer
572 uint8_t *in_middle = input + istride * in_y_range + in_x_range * 2;
576 // Generate the affine transform scaling values
577 float scale_width = ( float )iwidth / ( float )owidth;
578 float scale_height = ( float )iheight / ( float )oheight;
580 // Loop for the entirety of our output height.
581 for ( y = - out_y_range; y < out_y_range ; y ++ )
583 // Calculate the derived y value
584 dy = scale_height * y;
586 // Start at the beginning of the line
589 // Pointer to the middle of the input line
590 in_line = in_middle + dy * istride;
592 // Loop for the entirety of our output row.
593 for ( x = - out_x_range; x < out_x_range; x += 2 )
595 // Calculated the derived x
596 dx = scale_width * x;
598 // Check if x and y are in the valid input range.
599 if ( abs( dx ) < in_x_range && abs( dy ) < in_y_range )
601 // We're in the input range for this row.
602 in_ptr = in_line + ( dx >> 1 ) * 4;
603 *out_ptr ++ = *in_ptr ++;
604 *out_ptr ++ = *in_ptr ++;
605 *out_ptr ++ = *in_ptr ++;
606 *out_ptr ++ = *in_ptr ++;
610 // We're not in the input range for this row.
618 // Move to next output line
622 // Now update the frame
623 mlt_properties_set_data( properties, "image", output, owidth * oheight * 2, free, NULL );
624 mlt_properties_set_int( properties, "width", owidth );
625 mlt_properties_set_int( properties, "height", oheight );
631 // No change, return input