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"
23 #include "mlt_producer.h"
24 #include "mlt_factory.h"
29 /** Constructor for a frame.
32 mlt_frame
mlt_frame_init( )
35 mlt_frame
this = calloc( sizeof( struct mlt_frame_s
), 1 );
39 // Get the normalisation
40 char *normalisation
= mlt_environment( "MLT_NORMALISATION" );
42 // Initialise the properties
43 mlt_properties properties
= &this->parent
;
44 mlt_properties_init( properties
, this );
46 // Set default properties on the frame
47 mlt_properties_set_position( properties
, "_position", 0.0 );
48 mlt_properties_set_data( properties
, "image", NULL
, 0, NULL
, NULL
);
50 if ( normalisation
== NULL
|| strcmp( normalisation
, "NTSC" ) )
52 mlt_properties_set_int( properties
, "width", 720 );
53 mlt_properties_set_int( properties
, "height", 576 );
54 mlt_properties_set_int( properties
, "normalised_width", 720 );
55 mlt_properties_set_int( properties
, "normalised_height", 576 );
56 mlt_properties_set_double( properties
, "aspect_ratio", 59.0/54.0 );
60 mlt_properties_set_int( properties
, "width", 720 );
61 mlt_properties_set_int( properties
, "height", 480 );
62 mlt_properties_set_int( properties
, "normalised_width", 720 );
63 mlt_properties_set_int( properties
, "normalised_height", 480 );
64 mlt_properties_set_double( properties
, "aspect_ratio", 10.0/11.0 );
67 mlt_properties_set_data( properties
, "audio", NULL
, 0, NULL
, NULL
);
68 mlt_properties_set_data( properties
, "alpha", NULL
, 0, NULL
, NULL
);
70 // Construct stacks for frames and methods
71 this->stack_image
= mlt_deque_init( );
72 this->stack_audio
= mlt_deque_init( );
73 this->stack_service
= mlt_deque_init( );
79 /** Fetch the frames properties.
82 mlt_properties
mlt_frame_properties( mlt_frame
this )
84 return this != NULL ?
&this->parent
: NULL
;
87 /** Check if we have a way to derive something other than a test card.
90 int mlt_frame_is_test_card( mlt_frame
this )
92 return mlt_deque_count( this->stack_image
) == 0 || mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "test_image" );
95 /** Check if we have a way to derive something other than test audio.
98 int mlt_frame_is_test_audio( mlt_frame
this )
100 return mlt_deque_count( this->stack_audio
) == 0 || mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "test_audio" );
103 /** Get the aspect ratio of the frame.
106 double mlt_frame_get_aspect_ratio( mlt_frame
this )
108 return mlt_properties_get_double( MLT_FRAME_PROPERTIES( this ), "aspect_ratio" );
111 /** Set the aspect ratio of the frame.
114 int mlt_frame_set_aspect_ratio( mlt_frame
this, double value
)
116 return mlt_properties_set_double( MLT_FRAME_PROPERTIES( this ), "aspect_ratio", value
);
119 /** Get the position of this frame.
122 mlt_position
mlt_frame_get_position( mlt_frame
this )
124 int pos
= mlt_properties_get_position( MLT_FRAME_PROPERTIES( this ), "_position" );
125 return pos
< 0 ?
0 : pos
;
128 /** Set the position of this frame.
131 int mlt_frame_set_position( mlt_frame
this, mlt_position value
)
133 return mlt_properties_set_position( MLT_FRAME_PROPERTIES( this ), "_position", value
);
136 /** Stack a get_image callback.
139 int mlt_frame_push_get_image( mlt_frame
this, mlt_get_image get_image
)
141 return mlt_deque_push_back( this->stack_image
, get_image
);
144 /** Pop a get_image callback.
147 mlt_get_image
mlt_frame_pop_get_image( mlt_frame
this )
149 return mlt_deque_pop_back( this->stack_image
);
155 int mlt_frame_push_frame( mlt_frame
this, mlt_frame that
)
157 return mlt_deque_push_back( this->stack_image
, that
);
163 mlt_frame
mlt_frame_pop_frame( mlt_frame
this )
165 return mlt_deque_pop_back( this->stack_image
);
171 int mlt_frame_push_service( mlt_frame
this, void *that
)
173 return mlt_deque_push_back( this->stack_image
, that
);
179 void *mlt_frame_pop_service( mlt_frame
this )
181 return mlt_deque_pop_back( this->stack_image
);
187 int mlt_frame_push_service_int( mlt_frame
this, int that
)
189 return mlt_deque_push_back_int( this->stack_image
, that
);
195 int mlt_frame_pop_service_int( mlt_frame
this )
197 return mlt_deque_pop_back_int( this->stack_image
);
200 /** Push an audio item on the stack.
203 int mlt_frame_push_audio( mlt_frame
this, void *that
)
205 return mlt_deque_push_back( this->stack_audio
, that
);
208 /** Pop an audio item from the stack
211 void *mlt_frame_pop_audio( mlt_frame
this )
213 return mlt_deque_pop_back( this->stack_audio
);
216 /** Return the service stack
219 mlt_deque
mlt_frame_service_stack( mlt_frame
this )
221 return this->stack_service
;
224 /** [EXPERIMENTAL] Replace image stack with the information provided.
226 This might prove to be unreliable and restrictive - the idea is that a transition
227 which normally uses two images may decide to only use the b frame (ie: in the case
228 of a composite where the b frame completely obscures the a frame).
230 The image must be writable and the destructor for the image itself must be taken
231 care of on another frame and that frame cannot have a replace applied to it...
232 Further it assumes that no alpha mask is in use.
234 For these reasons, it can only be used in a specific situation - when you have
235 multiple tracks each with their own transition and these transitions are applied
236 in a strictly reversed order (ie: highest numbered [lowest track] is processed
239 More reliable approach - the cases should be detected during the process phase
240 and the upper tracks should simply not be invited to stack...
243 void mlt_frame_replace_image( mlt_frame
this, uint8_t *image
, mlt_image_format format
, int width
, int height
)
245 // Herein lies the potential problem for this function - it makes a potentially
246 // dangerous assumption that all content on the image stack can be removed without a destructor
247 while( mlt_deque_pop_back( this->stack_image
) ) ;
249 // Update the information
250 mlt_properties_set_data( MLT_FRAME_PROPERTIES( this ), "image", image
, 0, NULL
, NULL
);
251 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "width", width
);
252 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "height", height
);
253 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "format", format
);
254 this->get_alpha_mask
= NULL
;
257 /** Get the image associated to the frame.
260 int mlt_frame_get_image( mlt_frame
this, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
262 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
263 mlt_get_image get_image
= mlt_frame_pop_get_image( this );
264 mlt_producer producer
= mlt_properties_get_data( properties
, "test_card_producer", NULL
);
267 *width
= *width
>> 1 << 1;
269 if ( get_image
!= NULL
)
271 mlt_position position
= mlt_frame_get_position( this );
272 error
= get_image( this, buffer
, format
, width
, height
, writable
);
273 mlt_frame_set_position( this, position
);
275 else if ( mlt_properties_get_data( properties
, "image", NULL
) != NULL
)
277 *format
= mlt_image_yuv422
;
278 *buffer
= mlt_properties_get_data( properties
, "image", NULL
);
279 *width
= mlt_properties_get_int( properties
, "width" );
280 *height
= mlt_properties_get_int( properties
, "height" );
282 else if ( producer
!= NULL
)
284 mlt_frame test_frame
= NULL
;
285 mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer
), &test_frame
, 0 );
286 if ( test_frame
!= NULL
)
288 mlt_properties test_properties
= MLT_FRAME_PROPERTIES( test_frame
);
289 mlt_properties_set_double( test_properties
, "consumer_aspect_ratio", mlt_properties_get_double( properties
, "consumer_aspect_ratio" ) );
290 mlt_properties_set( test_properties
, "rescale.interp", mlt_properties_get( properties
, "rescale.interp" ) );
291 mlt_frame_get_image( test_frame
, buffer
, format
, width
, height
, writable
);
292 mlt_properties_set_data( properties
, "test_card_frame", test_frame
, 0, ( mlt_destructor
)mlt_frame_close
, NULL
);
293 mlt_properties_set_data( properties
, "image", *buffer
, *width
* *height
* 2, NULL
, NULL
);
294 mlt_properties_set_int( properties
, "width", *width
);
295 mlt_properties_set_int( properties
, "height", *height
);
296 mlt_properties_set_double( properties
, "aspect_ratio", mlt_frame_get_aspect_ratio( test_frame
) );
300 mlt_properties_set_data( properties
, "test_card_producer", NULL
, 0, NULL
, NULL
);
301 mlt_frame_get_image( this, buffer
, format
, width
, height
, writable
);
310 *width
= *width
== 0 ?
720 : *width
;
311 *height
= *height
== 0 ?
576 : *height
;
312 size
= *width
* *height
;
314 mlt_properties_set_int( properties
, "width", *width
);
315 mlt_properties_set_int( properties
, "height", *height
);
316 mlt_properties_set_int( properties
, "aspect_ratio", 1 );
324 case mlt_image_rgb24
:
327 *buffer
= mlt_pool_alloc( size
);
329 memset( *buffer
, 255, size
);
331 case mlt_image_rgb24a
:
334 *buffer
= mlt_pool_alloc( size
);
336 memset( *buffer
, 255, size
);
338 case mlt_image_yuv422
:
341 *buffer
= mlt_pool_alloc( size
);
344 while ( p
!= NULL
&& p
!= q
)
350 case mlt_image_yuv420p
:
352 *buffer
= mlt_pool_alloc( size
);
354 memset( *buffer
, 255, size
);
358 mlt_properties_set_data( properties
, "image", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
359 mlt_properties_set_int( properties
, "test_image", 1 );
365 uint8_t *mlt_frame_get_alpha_mask( mlt_frame
this )
367 if ( this != NULL
&& this->get_alpha_mask
!= NULL
)
368 return this->get_alpha_mask( this );
369 return this == NULL ? NULL
: mlt_properties_get_data( &this->parent
, "alpha", NULL
);
372 int mlt_frame_get_audio( mlt_frame
this, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
374 mlt_get_audio get_audio
= mlt_frame_pop_audio( this );
375 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
376 int hide
= mlt_properties_get_int( properties
, "test_audio" );
378 if ( hide
== 0 && get_audio
!= NULL
)
380 mlt_position position
= mlt_frame_get_position( this );
381 get_audio( this, buffer
, format
, frequency
, channels
, samples
);
382 mlt_frame_set_position( this, position
);
384 else if ( mlt_properties_get_data( properties
, "audio", NULL
) )
386 *buffer
= mlt_properties_get_data( properties
, "audio", NULL
);
387 *frequency
= mlt_properties_get_int( properties
, "audio_frequency" );
388 *channels
= mlt_properties_get_int( properties
, "audio_channels" );
389 *samples
= mlt_properties_get_int( properties
, "audio_samples" );
394 *samples
= *samples
<= 0 ?
1920 : *samples
;
395 *channels
= *channels
<= 0 ?
2 : *channels
;
396 *frequency
= *frequency
<= 0 ?
48000 : *frequency
;
397 size
= *samples
* *channels
* sizeof( int16_t );
398 *buffer
= mlt_pool_alloc( size
);
399 if ( *buffer
!= NULL
)
400 memset( *buffer
, 0, size
);
401 mlt_properties_set_data( properties
, "audio", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
402 mlt_properties_set_int( properties
, "test_audio", 1 );
405 mlt_properties_set_int( properties
, "audio_frequency", *frequency
);
406 mlt_properties_set_int( properties
, "audio_channels", *channels
);
407 mlt_properties_set_int( properties
, "audio_samples", *samples
);
409 if ( mlt_properties_get( properties
, "meta.volume" ) )
411 double value
= mlt_properties_get_double( properties
, "meta.volume" );
414 memset( *buffer
, 0, *samples
* *channels
* 2 );
415 mlt_properties_set_double( properties
, "meta.volume", 1.0 );
417 else if ( value
!= 1.0 )
419 int total
= *samples
* *channels
;
420 int16_t *p
= *buffer
;
426 mlt_properties_set_double( properties
, "meta.volume", 1.0 );
433 unsigned char *mlt_frame_get_waveform( mlt_frame
this, int w
, int h
)
436 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
437 mlt_audio_format format
= mlt_audio_pcm
;
438 int frequency
= 32000; // lower frequency available?
440 double fps
= mlt_properties_get_double( properties
, "fps" );
441 int samples
= mlt_sample_calculator( fps
, frequency
, mlt_frame_get_position( this ) );
444 mlt_frame_get_audio( this, &pcm
, &format
, &frequency
, &channels
, &samples
);
446 // Make an 8-bit buffer large enough to hold rendering
448 unsigned char *bitmap
= ( unsigned char* )mlt_pool_alloc( size
);
449 if ( bitmap
!= NULL
)
450 memset( bitmap
, 0, size
);
451 mlt_properties_set_data( properties
, "waveform", bitmap
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
453 // Render vertical lines
454 int16_t *ubound
= pcm
+ samples
* channels
;
455 int skip
= samples
/ w
- 1;
458 // Iterate sample stream and along x coordinate
459 for ( i
= 0; i
< w
&& pcm
< ubound
; i
++ )
461 // pcm data has channels interleaved
462 for ( j
= 0; j
< channels
; j
++ )
464 // Determine sample's magnitude from 2s complement;
465 int pcm_magnitude
= *pcm
< 0 ?
~(*pcm
) + 1 : *pcm
;
466 // The height of a line is the ratio of the magnitude multiplied by
467 // half the vertical resolution
468 int height
= ( int )( ( double )( pcm_magnitude
) / 32768 * h
/ 2 );
469 // Determine the starting y coordinate - left channel above center,
470 // right channel below - currently assumes 2 channels
471 int displacement
= ( h
/ 2 ) - ( 1 - j
) * height
;
472 // Position buffer pointer using y coordinate, stride, and x coordinate
473 unsigned char *p
= &bitmap
[ i
+ displacement
* w
];
475 // Draw vertical line
476 for ( k
= 0; k
< height
; k
++ )
481 pcm
+= skip
* channels
;
487 mlt_producer
mlt_frame_get_original_producer( mlt_frame
this )
490 return mlt_properties_get_data( MLT_FRAME_PROPERTIES( this ), "_producer", NULL
);
494 void mlt_frame_close( mlt_frame
this )
496 if ( this != NULL
&& mlt_properties_dec_ref( MLT_FRAME_PROPERTIES( this ) ) <= 0 )
498 mlt_deque_close( this->stack_image
);
499 mlt_deque_close( this->stack_audio
);
500 while( mlt_deque_peek_back( this->stack_service
) )
501 mlt_service_close( mlt_deque_pop_back( this->stack_service
) );
502 mlt_deque_close( this->stack_service
);
503 mlt_properties_close( &this->parent
);
508 /***** convenience functions *****/
510 int mlt_convert_rgb24a_to_yuv422( uint8_t *rgba
, int width
, int height
, int stride
, uint8_t *yuv
, uint8_t *alpha
)
513 register int y0
, y1
, u0
, u1
, v0
, v1
;
514 register int r
, g
, b
;
515 register uint8_t *d
= yuv
;
518 for ( i
= 0; i
< height
; i
++ )
520 register uint8_t *s
= rgba
+ ( stride
* i
);
521 for ( j
= 0; j
< ( width
/ 2 ); j
++ )
527 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
532 RGB2YUV (r
, g
, b
, y1
, u1
, v1
);
544 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
552 int mlt_convert_rgb24_to_yuv422( uint8_t *rgb
, int width
, int height
, int stride
, uint8_t *yuv
)
555 register int y0
, y1
, u0
, u1
, v0
, v1
;
556 register int r
, g
, b
;
557 register uint8_t *d
= yuv
;
560 for ( i
= 0; i
< height
; i
++ )
562 register uint8_t *s
= rgb
+ ( stride
* i
);
563 for ( j
= 0; j
< ( width
/ 2 ); j
++ )
568 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
572 RGB2YUV (r
, g
, b
, y1
, u1
, v1
);
583 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
591 int mlt_convert_yuv420p_to_yuv422( uint8_t *yuv420p
, int width
, int height
, int stride
, uint8_t *yuv
)
596 int half
= width
>> 1;
598 uint8_t *Y
= yuv420p
;
599 uint8_t *U
= Y
+ width
* height
;
600 uint8_t *V
= U
+ width
* height
/ 4;
602 register uint8_t *d
= yuv
;
604 for ( i
= 0; i
< height
; i
++ )
606 register uint8_t *u
= U
+ ( i
/ 2 ) * ( half
);
607 register uint8_t *v
= V
+ ( i
/ 2 ) * ( half
);
609 for ( j
= 0; j
< half
; j
++ )
620 uint8_t *mlt_resize_alpha( uint8_t *input
, int owidth
, int oheight
, int iwidth
, int iheight
)
622 uint8_t *output
= NULL
;
624 if ( input
!= NULL
&& ( iwidth
!= owidth
|| iheight
!= oheight
) && ( owidth
> 6 && oheight
> 6 ) )
626 iwidth
= iwidth
- ( iwidth
% 2 );
627 owidth
= owidth
- ( owidth
% 2 );
629 output
= mlt_pool_alloc( owidth
* oheight
);
631 // Coordinates (0,0 is middle of output)
635 int out_x_range
= owidth
/ 2;
636 int out_y_range
= oheight
/ 2;
637 int in_x_range
= iwidth
/ 2 < out_x_range ? iwidth
/ 2 : out_x_range
;
638 int in_y_range
= iheight
/ 2 < out_y_range ? iheight
/ 2 : out_y_range
;
641 uint8_t *out_line
= output
;
642 uint8_t *out_ptr
= out_line
;
644 // Calculate a middle and possibly invalid pointer in the input
645 uint8_t *in_middle
= input
+ iwidth
* ( iheight
/ 2 ) + ( iwidth
/ 2 );
646 int in_line
= - in_y_range
* iwidth
- in_x_range
;
650 // Fill whole section with black
651 y
= out_y_range
- ( iheight
/ 2 );
652 int blank_elements
= owidth
* y
;
653 elements
= blank_elements
;
654 while ( elements
-- )
657 int active_width
= iwidth
;
658 int inactive_width
= out_x_range
- in_x_range
;
662 // Loop for the entirety of our output height.
665 // Start at the beginning of the line
668 // Fill the outer part with black
669 elements
= inactive_width
;
670 while ( elements
-- )
673 // We're in the input range for this row.
674 p
= in_middle
+ in_line
;
675 end
= out_ptr
+ active_width
;
676 while ( out_ptr
!= end
)
679 // Fill the outer part with black
680 elements
= inactive_width
;
681 while ( elements
-- )
684 // Move to next input line
687 // Move to next output line
691 // Fill whole section with black
692 elements
= blank_elements
;
693 while ( elements
-- )
700 void mlt_resize_yuv422( uint8_t *output
, int owidth
, int oheight
, uint8_t *input
, int iwidth
, int iheight
)
703 int istride
= iwidth
* 2;
704 int ostride
= owidth
* 2;
706 iwidth
= iwidth
- ( iwidth
% 2 );
707 owidth
= owidth
- ( owidth
% 2 );
708 //iheight = iheight - ( iheight % 2 );
709 //oheight = oheight - ( oheight % 2 );
711 // Optimisation point
712 if ( output
== NULL
|| input
== NULL
|| ( owidth
<= 6 || oheight
<= 6 || iwidth
<= 6 || oheight
<= 6 ) )
716 else if ( iwidth
== owidth
&& iheight
== oheight
)
718 memcpy( output
, input
, iheight
* istride
);
722 // Coordinates (0,0 is middle of output)
726 int out_x_range
= owidth
/ 2;
727 int out_y_range
= oheight
/ 2;
728 int in_x_range
= iwidth
/ 2 < out_x_range ? iwidth
/ 2 : out_x_range
;
729 int in_y_range
= iheight
/ 2 < out_y_range ? iheight
/ 2 : out_y_range
;
732 uint8_t *out_line
= output
;
733 uint8_t *out_ptr
= out_line
;
735 // Calculate a middle and possibly invalid pointer in the input
736 uint8_t *in_middle
= input
+ istride
* ( iheight
/ 2 ) + iwidth
;
737 int in_line
= - in_y_range
* istride
- in_x_range
* 2;
741 // Fill whole section with black
742 y
= out_y_range
- ( iheight
/ 2 );
743 int blank_elements
= ostride
* y
/ 2;
744 elements
= blank_elements
;
745 while ( elements
-- )
751 int active_width
= 2 * iwidth
;
752 int left_inactive_width
= out_x_range
- in_x_range
;
753 int right_inactive_width
= left_inactive_width
;
761 right_inactive_width
+= 2;
764 // Loop for the entirety of our output height.
767 // Start at the beginning of the line
770 // Fill the outer part with black
771 elements
= left_inactive_width
;
772 while ( elements
-- )
778 // We're in the input range for this row.
779 p
= in_middle
+ in_line
;
780 end
= out_ptr
+ active_width
;
781 while ( out_ptr
!= end
)
787 // Fill the outer part with black
788 elements
= right_inactive_width
;
789 while ( elements
-- )
795 // Move to next input line
798 // Move to next output line
802 // Fill whole section with black
803 elements
= blank_elements
;
804 while ( elements
-- )
811 /** A resizing function for yuv422 frames - this does not rescale, but simply
812 resizes. It assumes yuv422 images available on the frame so use with care.
815 uint8_t *mlt_frame_resize_yuv422( mlt_frame
this, int owidth
, int oheight
)
818 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
820 // Get the input image, width and height
821 uint8_t *input
= mlt_properties_get_data( properties
, "image", NULL
);
822 uint8_t *alpha
= mlt_frame_get_alpha_mask( this );
824 int iwidth
= mlt_properties_get_int( properties
, "width" );
825 int iheight
= mlt_properties_get_int( properties
, "height" );
827 // If width and height are correct, don't do anything
828 if ( iwidth
!= owidth
|| iheight
!= oheight
)
830 // Create the output image
831 uint8_t *output
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) * 2 );
833 // Call the generic resize
834 mlt_resize_yuv422( output
, owidth
, oheight
, input
, iwidth
, iheight
);
836 // Now update the frame
837 mlt_properties_set_data( properties
, "image", output
, owidth
* ( oheight
+ 1 ) * 2, ( mlt_destructor
)mlt_pool_release
, NULL
);
838 mlt_properties_set_int( properties
, "width", owidth
);
839 mlt_properties_set_int( properties
, "height", oheight
);
841 // We should resize the alpha too
842 alpha
= mlt_resize_alpha( alpha
, owidth
, oheight
, iwidth
, iheight
);
845 mlt_properties_set_data( properties
, "alpha", alpha
, owidth
* ( oheight
+ 1 ), ( mlt_destructor
)mlt_pool_release
, NULL
);
846 this->get_alpha_mask
= NULL
;
852 // No change, return input
856 /** A rescaling function for yuv422 frames - low quality, and provided for testing
857 only. It assumes yuv422 images available on the frame so use with care.
860 uint8_t *mlt_frame_rescale_yuv422( mlt_frame
this, int owidth
, int oheight
)
863 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
865 // Get the input image, width and height
866 uint8_t *input
= mlt_properties_get_data( properties
, "image", NULL
);
867 int iwidth
= mlt_properties_get_int( properties
, "width" );
868 int iheight
= mlt_properties_get_int( properties
, "height" );
870 // If width and height are correct, don't do anything
871 if ( iwidth
!= owidth
|| iheight
!= oheight
)
873 // Create the output image
874 uint8_t *output
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) * 2 );
877 int istride
= iwidth
* 2;
878 int ostride
= owidth
* 2;
880 iwidth
= iwidth
- ( iwidth
% 4 );
882 // Derived coordinates
886 int out_x_range
= owidth
/ 2;
887 int out_y_range
= oheight
/ 2;
888 int in_x_range
= iwidth
/ 2;
889 int in_y_range
= iheight
/ 2;
892 register uint8_t *out_line
= output
;
893 register uint8_t *out_ptr
;
895 // Calculate a middle pointer
896 uint8_t *in_middle
= input
+ istride
* in_y_range
+ in_x_range
* 2;
899 // Generate the affine transform scaling values
900 register int scale_width
= ( iwidth
<< 16 ) / owidth
;
901 register int scale_height
= ( iheight
<< 16 ) / oheight
;
902 register int base
= 0;
904 int outer
= out_x_range
* scale_width
;
905 int bottom
= out_y_range
* scale_height
;
907 // Loop for the entirety of our output height.
908 for ( dy
= - bottom
; dy
< bottom
; dy
+= scale_height
)
910 // Start at the beginning of the line
913 // Pointer to the middle of the input line
914 in_line
= in_middle
+ ( dy
>> 16 ) * istride
;
916 // Loop for the entirety of our output row.
917 for ( dx
= - outer
; dx
< outer
; dx
+= scale_width
)
921 *out_ptr
++ = *( in_line
+ base
);
923 *out_ptr
++ = *( in_line
+ base
+ 1 );
927 *out_ptr
++ = *( in_line
+ base
);
929 *out_ptr
++ = *( in_line
+ base
+ 3 );
932 // Move to next output line
936 // Now update the frame
937 mlt_properties_set_data( properties
, "image", output
, owidth
* ( oheight
+ 1 ) * 2, ( mlt_destructor
)mlt_pool_release
, NULL
);
938 mlt_properties_set_int( properties
, "width", owidth
);
939 mlt_properties_set_int( properties
, "height", oheight
);
945 // No change, return input
949 int mlt_frame_mix_audio( mlt_frame
this, mlt_frame that
, float weight_start
, float weight_end
, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
953 int frequency_src
= *frequency
, frequency_dest
= *frequency
;
954 int channels_src
= *channels
, channels_dest
= *channels
;
955 int samples_src
= *samples
, samples_dest
= *samples
;
959 mlt_frame_get_audio( this, &dest
, format
, &frequency_dest
, &channels_dest
, &samples_dest
);
960 mlt_frame_get_audio( that
, &src
, format
, &frequency_src
, &channels_src
, &samples_src
);
962 int silent
= mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "silent_audio" );
963 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "silent_audio", 0 );
965 memset( dest
, 0, samples_dest
* channels_dest
* sizeof( int16_t ) );
967 silent
= mlt_properties_get_int( MLT_FRAME_PROPERTIES( that
), "silent_audio" );
968 mlt_properties_set_int( MLT_FRAME_PROPERTIES( that
), "silent_audio", 0 );
970 memset( src
, 0, samples_src
* channels_src
* sizeof( int16_t ) );
972 if ( channels_src
> 6 )
974 if ( channels_dest
> 6 )
976 if ( samples_src
> 4000 )
978 if ( samples_dest
> 4000 )
981 // determine number of samples to process
982 *samples
= samples_src
< samples_dest ? samples_src
: samples_dest
;
983 *channels
= channels_src
< channels_dest ? channels_src
: channels_dest
;
985 *frequency
= frequency_dest
;
987 // Compute a smooth ramp over start to end
988 float weight
= weight_start
;
989 float weight_step
= ( weight_end
- weight_start
) / *samples
;
992 for ( i
= 0; i
< *samples
; i
++ )
994 for ( j
= 0; j
< *channels
; j
++ )
996 if ( j
< channels_dest
)
997 d
= (double) dest
[ i
* channels_dest
+ j
];
998 if ( j
< channels_src
)
999 s
= (double) src
[ i
* channels_src
+ j
];
1000 dest
[ i
* channels_dest
+ j
] = s
* weight
+ d
* ( 1.0 - weight
);
1002 weight
+= weight_step
;
1008 int mlt_sample_calculator( float fps
, int frequency
, int64_t position
)
1012 if ( ( int )( fps
* 100 ) == 2997 )
1014 samples
= frequency
/ 30;
1016 switch ( frequency
)
1019 if ( position
% 5 != 0 )
1023 if ( position
% 300 == 0 )
1025 else if ( position
% 30 == 0 )
1027 else if ( position
% 2 == 0 )
1033 if ( position
% 30 == 0 )
1035 else if ( position
% 29 == 0 )
1037 else if ( position
% 4 == 2 )
1046 else if ( fps
!= 0 )
1048 samples
= frequency
/ fps
;