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
);
184 /** Push an audio item on the stack.
187 int mlt_frame_push_audio( mlt_frame
this, void *that
)
189 return mlt_deque_push_back( this->stack_audio
, that
);
192 /** Pop an audio item from the stack
195 void *mlt_frame_pop_audio( mlt_frame
this )
197 return mlt_deque_pop_back( this->stack_audio
);
200 /** Return the service stack
203 mlt_deque
mlt_frame_service_stack( mlt_frame
this )
205 return this->stack_service
;
208 /** [EXPERIMENTAL] Replace image stack with the information provided.
210 This might prove to be unreliable and restrictive - the idea is that a transition
211 which normally uses two images may decide to only use the b frame (ie: in the case
212 of a composite where the b frame completely obscures the a frame).
214 The image must be writable and the destructor for the image itself must be taken
215 care of on another frame and that frame cannot have a replace applied to it...
216 Further it assumes that no alpha mask is in use.
218 For these reasons, it can only be used in a specific situation - when you have
219 multiple tracks each with their own transition and these transitions are applied
220 in a strictly reversed order (ie: highest numbered [lowest track] is processed
223 More reliable approach - the cases should be detected during the process phase
224 and the upper tracks should simply not be invited to stack...
227 void mlt_frame_replace_image( mlt_frame
this, uint8_t *image
, mlt_image_format format
, int width
, int height
)
229 // Herein lies the potential problem for this function - it makes a potentially
230 // dangerous assumption that all content on the image stack can be removed without a destructor
231 while( mlt_deque_pop_back( this->stack_image
) ) ;
233 // Update the information
234 mlt_properties_set_data( MLT_FRAME_PROPERTIES( this ), "image", image
, 0, NULL
, NULL
);
235 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "width", width
);
236 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "height", height
);
237 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "format", format
);
238 this->get_alpha_mask
= NULL
;
241 /** Get the image associated to the frame.
244 int mlt_frame_get_image( mlt_frame
this, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
246 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
247 mlt_get_image get_image
= mlt_frame_pop_get_image( this );
248 mlt_producer producer
= mlt_properties_get_data( properties
, "test_card_producer", NULL
);
250 *width
= *width
>> 1 << 1;
252 if ( get_image
!= NULL
)
255 mlt_position position
= mlt_frame_get_position( this );
256 error
= get_image( this, buffer
, format
, width
, height
, writable
);
257 mlt_frame_set_position( this, position
);
260 else if ( mlt_properties_get_data( properties
, "image", NULL
) != NULL
)
262 *format
= mlt_image_yuv422
;
263 *buffer
= mlt_properties_get_data( properties
, "image", NULL
);
264 *width
= mlt_properties_get_int( properties
, "width" );
265 *height
= mlt_properties_get_int( properties
, "height" );
267 else if ( producer
!= NULL
)
269 mlt_frame test_frame
= NULL
;
270 mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer
), &test_frame
, 0 );
271 if ( test_frame
!= NULL
)
273 mlt_properties test_properties
= MLT_FRAME_PROPERTIES( test_frame
);
274 mlt_properties_set_double( test_properties
, "consumer_aspect_ratio", mlt_properties_get_double( properties
, "consumer_aspect_ratio" ) );
275 mlt_properties_set( test_properties
, "rescale.interp", mlt_properties_get( properties
, "rescale.interp" ) );
276 mlt_frame_get_image( test_frame
, buffer
, format
, width
, height
, writable
);
277 mlt_properties_set_data( properties
, "test_card_frame", test_frame
, 0, ( mlt_destructor
)mlt_frame_close
, NULL
);
278 mlt_properties_set_data( properties
, "image", *buffer
, *width
* *height
* 2, NULL
, NULL
);
279 mlt_properties_set_int( properties
, "width", *width
);
280 mlt_properties_set_int( properties
, "height", *height
);
281 mlt_properties_set_double( properties
, "aspect_ratio", mlt_frame_get_aspect_ratio( test_frame
) );
285 mlt_properties_set_data( properties
, "test_card_producer", NULL
, 0, NULL
, NULL
);
286 mlt_frame_get_image( this, buffer
, format
, width
, height
, writable
);
295 *width
= *width
== 0 ?
720 : *width
;
296 *height
= *height
== 0 ?
576 : *height
;
297 size
= *width
* *height
;
299 mlt_properties_set_int( properties
, "width", *width
);
300 mlt_properties_set_int( properties
, "height", *height
);
301 mlt_properties_set_int( properties
, "aspect_ratio", 1 );
309 case mlt_image_rgb24
:
312 *buffer
= mlt_pool_alloc( size
);
314 memset( *buffer
, 255, size
);
316 case mlt_image_rgb24a
:
319 *buffer
= mlt_pool_alloc( size
);
321 memset( *buffer
, 255, size
);
323 case mlt_image_yuv422
:
326 *buffer
= mlt_pool_alloc( size
);
329 while ( p
!= NULL
&& p
!= q
)
335 case mlt_image_yuv420p
:
337 *buffer
= mlt_pool_alloc( size
);
339 memset( *buffer
, 255, size
);
343 mlt_properties_set_data( properties
, "image", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
344 mlt_properties_set_int( properties
, "test_image", 1 );
350 uint8_t *mlt_frame_get_alpha_mask( mlt_frame
this )
352 if ( this != NULL
&& this->get_alpha_mask
!= NULL
)
353 return this->get_alpha_mask( this );
354 return this == NULL ? NULL
: mlt_properties_get_data( &this->parent
, "alpha", NULL
);
357 int mlt_frame_get_audio( mlt_frame
this, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
359 mlt_get_audio get_audio
= mlt_frame_pop_audio( this );
360 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
361 int hide
= mlt_properties_get_int( properties
, "test_audio" );
363 if ( hide
== 0 && get_audio
!= NULL
)
365 mlt_position position
= mlt_frame_get_position( this );
366 get_audio( this, buffer
, format
, frequency
, channels
, samples
);
367 mlt_frame_set_position( this, position
);
369 else if ( mlt_properties_get_data( properties
, "audio", NULL
) )
371 *buffer
= mlt_properties_get_data( properties
, "audio", NULL
);
372 *frequency
= mlt_properties_get_int( properties
, "audio_frequency" );
373 *channels
= mlt_properties_get_int( properties
, "audio_channels" );
374 *samples
= mlt_properties_get_int( properties
, "audio_samples" );
379 *samples
= *samples
<= 0 ?
1920 : *samples
;
380 *channels
= *channels
<= 0 ?
2 : *channels
;
381 *frequency
= *frequency
<= 0 ?
48000 : *frequency
;
382 size
= *samples
* *channels
* sizeof( int16_t );
383 *buffer
= mlt_pool_alloc( size
);
384 if ( *buffer
!= NULL
)
385 memset( *buffer
, 0, size
);
386 mlt_properties_set_data( properties
, "audio", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
387 mlt_properties_set_int( properties
, "test_audio", 1 );
390 mlt_properties_set_int( properties
, "audio_frequency", *frequency
);
391 mlt_properties_set_int( properties
, "audio_channels", *channels
);
392 mlt_properties_set_int( properties
, "audio_samples", *samples
);
394 if ( mlt_properties_get( properties
, "meta.volume" ) )
396 double value
= mlt_properties_get_double( properties
, "meta.volume" );
399 memset( *buffer
, 0, *samples
* *channels
* 2 );
400 mlt_properties_set_double( properties
, "meta.volume", 1.0 );
402 else if ( value
!= 1.0 )
404 int total
= *samples
* *channels
;
405 int16_t *p
= *buffer
;
411 mlt_properties_set_double( properties
, "meta.volume", 1.0 );
418 unsigned char *mlt_frame_get_waveform( mlt_frame
this, int w
, int h
)
421 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
422 mlt_audio_format format
= mlt_audio_pcm
;
423 int frequency
= 32000; // lower frequency available?
425 double fps
= mlt_properties_get_double( properties
, "fps" );
426 int samples
= mlt_sample_calculator( fps
, frequency
, mlt_frame_get_position( this ) );
429 mlt_frame_get_audio( this, &pcm
, &format
, &frequency
, &channels
, &samples
);
431 // Make an 8-bit buffer large enough to hold rendering
433 unsigned char *bitmap
= ( unsigned char* )mlt_pool_alloc( size
);
434 if ( bitmap
!= NULL
)
435 memset( bitmap
, 0, size
);
436 mlt_properties_set_data( properties
, "waveform", bitmap
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
438 // Render vertical lines
439 int16_t *ubound
= pcm
+ samples
* channels
;
440 int skip
= samples
/ w
- 1;
443 // Iterate sample stream and along x coordinate
444 for ( i
= 0; i
< w
&& pcm
< ubound
; i
++ )
446 // pcm data has channels interleaved
447 for ( j
= 0; j
< channels
; j
++ )
449 // Determine sample's magnitude from 2s complement;
450 int pcm_magnitude
= *pcm
< 0 ?
~(*pcm
) + 1 : *pcm
;
451 // The height of a line is the ratio of the magnitude multiplied by
452 // half the vertical resolution
453 int height
= ( int )( ( double )( pcm_magnitude
) / 32768 * h
/ 2 );
454 // Determine the starting y coordinate - left channel above center,
455 // right channel below - currently assumes 2 channels
456 int displacement
= ( h
/ 2 ) - ( 1 - j
) * height
;
457 // Position buffer pointer using y coordinate, stride, and x coordinate
458 unsigned char *p
= &bitmap
[ i
+ displacement
* w
];
460 // Draw vertical line
461 for ( k
= 0; k
< height
; k
++ )
466 pcm
+= skip
* channels
;
472 mlt_producer
mlt_frame_get_original_producer( mlt_frame
this )
475 return mlt_properties_get_data( MLT_FRAME_PROPERTIES( this ), "_producer", NULL
);
479 void mlt_frame_close( mlt_frame
this )
481 if ( this != NULL
&& mlt_properties_dec_ref( MLT_FRAME_PROPERTIES( this ) ) <= 0 )
483 mlt_deque_close( this->stack_image
);
484 mlt_deque_close( this->stack_audio
);
485 while( mlt_deque_peek_back( this->stack_service
) )
486 mlt_service_close( mlt_deque_pop_back( this->stack_service
) );
487 mlt_deque_close( this->stack_service
);
488 mlt_properties_close( &this->parent
);
493 /***** convenience functions *****/
495 int mlt_convert_rgb24a_to_yuv422( uint8_t *rgba
, int width
, int height
, int stride
, uint8_t *yuv
, uint8_t *alpha
)
498 register int y0
, y1
, u0
, u1
, v0
, v1
;
499 register int r
, g
, b
;
500 register uint8_t *d
= yuv
;
503 for ( i
= 0; i
< height
; i
++ )
505 register uint8_t *s
= rgba
+ ( stride
* i
);
506 for ( j
= 0; j
< ( width
/ 2 ); j
++ )
512 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
517 RGB2YUV (r
, g
, b
, y1
, u1
, v1
);
529 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
537 int mlt_convert_rgb24_to_yuv422( uint8_t *rgb
, int width
, int height
, int stride
, uint8_t *yuv
)
540 register int y0
, y1
, u0
, u1
, v0
, v1
;
541 register int r
, g
, b
;
542 register uint8_t *d
= yuv
;
545 for ( i
= 0; i
< height
; i
++ )
547 register uint8_t *s
= rgb
+ ( stride
* i
);
548 for ( j
= 0; j
< ( width
/ 2 ); j
++ )
553 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
557 RGB2YUV (r
, g
, b
, y1
, u1
, v1
);
568 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
576 int mlt_convert_yuv420p_to_yuv422( uint8_t *yuv420p
, int width
, int height
, int stride
, uint8_t *yuv
)
581 int half
= width
>> 1;
583 uint8_t *Y
= yuv420p
;
584 uint8_t *U
= Y
+ width
* height
;
585 uint8_t *V
= U
+ width
* height
/ 4;
587 register uint8_t *d
= yuv
;
589 for ( i
= 0; i
< height
; i
++ )
591 register uint8_t *u
= U
+ ( i
/ 2 ) * ( half
);
592 register uint8_t *v
= V
+ ( i
/ 2 ) * ( half
);
594 for ( j
= 0; j
< half
; j
++ )
605 uint8_t *mlt_resize_alpha( uint8_t *input
, int owidth
, int oheight
, int iwidth
, int iheight
)
607 uint8_t *output
= NULL
;
609 if ( input
!= NULL
&& ( iwidth
!= owidth
|| iheight
!= oheight
) && ( owidth
> 6 && oheight
> 6 ) )
611 iwidth
= iwidth
- ( iwidth
% 2 );
612 owidth
= owidth
- ( owidth
% 2 );
614 output
= mlt_pool_alloc( owidth
* oheight
);
616 // Coordinates (0,0 is middle of output)
620 int out_x_range
= owidth
/ 2;
621 int out_y_range
= oheight
/ 2;
622 int in_x_range
= iwidth
/ 2 < out_x_range ? iwidth
/ 2 : out_x_range
;
623 int in_y_range
= iheight
/ 2 < out_y_range ? iheight
/ 2 : out_y_range
;
626 uint8_t *out_line
= output
;
627 uint8_t *out_ptr
= out_line
;
629 // Calculate a middle and possibly invalid pointer in the input
630 uint8_t *in_middle
= input
+ iwidth
* ( iheight
/ 2 ) + ( iwidth
/ 2 );
631 int in_line
= - in_y_range
* iwidth
- in_x_range
;
635 // Fill whole section with black
636 y
= out_y_range
- ( iheight
/ 2 );
637 int blank_elements
= owidth
* y
;
638 elements
= blank_elements
;
639 while ( elements
-- )
642 int active_width
= iwidth
;
643 int inactive_width
= out_x_range
- in_x_range
;
647 // Loop for the entirety of our output height.
650 // Start at the beginning of the line
653 // Fill the outer part with black
654 elements
= inactive_width
;
655 while ( elements
-- )
658 // We're in the input range for this row.
659 p
= in_middle
+ in_line
;
660 end
= out_ptr
+ active_width
;
661 while ( out_ptr
!= end
)
664 // Fill the outer part with black
665 elements
= inactive_width
;
666 while ( elements
-- )
669 // Move to next input line
672 // Move to next output line
676 // Fill whole section with black
677 elements
= blank_elements
;
678 while ( elements
-- )
685 void mlt_resize_yuv422( uint8_t *output
, int owidth
, int oheight
, uint8_t *input
, int iwidth
, int iheight
)
688 int istride
= iwidth
* 2;
689 int ostride
= owidth
* 2;
691 iwidth
= iwidth
- ( iwidth
% 2 );
692 owidth
= owidth
- ( owidth
% 2 );
693 //iheight = iheight - ( iheight % 2 );
694 //oheight = oheight - ( oheight % 2 );
696 // Optimisation point
697 if ( output
== NULL
|| input
== NULL
|| ( owidth
<= 6 || oheight
<= 6 || iwidth
<= 6 || oheight
<= 6 ) )
701 else if ( iwidth
== owidth
&& iheight
== oheight
)
703 memcpy( output
, input
, iheight
* istride
);
707 // Coordinates (0,0 is middle of output)
711 int out_x_range
= owidth
/ 2;
712 int out_y_range
= oheight
/ 2;
713 int in_x_range
= iwidth
/ 2 < out_x_range ? iwidth
/ 2 : out_x_range
;
714 int in_y_range
= iheight
/ 2 < out_y_range ? iheight
/ 2 : out_y_range
;
717 uint8_t *out_line
= output
;
718 uint8_t *out_ptr
= out_line
;
720 // Calculate a middle and possibly invalid pointer in the input
721 uint8_t *in_middle
= input
+ istride
* ( iheight
/ 2 ) + iwidth
;
722 int in_line
= - in_y_range
* istride
- in_x_range
* 2;
726 // Fill whole section with black
727 y
= out_y_range
- ( iheight
/ 2 );
728 int blank_elements
= ostride
* y
/ 2;
729 elements
= blank_elements
;
730 while ( elements
-- )
736 int active_width
= 2 * iwidth
;
737 int left_inactive_width
= out_x_range
- in_x_range
;
738 int right_inactive_width
= left_inactive_width
;
746 right_inactive_width
+= 2;
749 // Loop for the entirety of our output height.
752 // Start at the beginning of the line
755 // Fill the outer part with black
756 elements
= left_inactive_width
;
757 while ( elements
-- )
763 // We're in the input range for this row.
764 p
= in_middle
+ in_line
;
765 end
= out_ptr
+ active_width
;
766 while ( out_ptr
!= end
)
772 // Fill the outer part with black
773 elements
= right_inactive_width
;
774 while ( elements
-- )
780 // Move to next input line
783 // Move to next output line
787 // Fill whole section with black
788 elements
= blank_elements
;
789 while ( elements
-- )
796 /** A resizing function for yuv422 frames - this does not rescale, but simply
797 resizes. It assumes yuv422 images available on the frame so use with care.
800 uint8_t *mlt_frame_resize_yuv422( mlt_frame
this, int owidth
, int oheight
)
803 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
805 // Get the input image, width and height
806 uint8_t *input
= mlt_properties_get_data( properties
, "image", NULL
);
807 uint8_t *alpha
= mlt_frame_get_alpha_mask( this );
809 int iwidth
= mlt_properties_get_int( properties
, "width" );
810 int iheight
= mlt_properties_get_int( properties
, "height" );
812 // If width and height are correct, don't do anything
813 if ( iwidth
!= owidth
|| iheight
!= oheight
)
815 // Create the output image
816 uint8_t *output
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) * 2 );
818 // Call the generic resize
819 mlt_resize_yuv422( output
, owidth
, oheight
, input
, iwidth
, iheight
);
821 // Now update the frame
822 mlt_properties_set_data( properties
, "image", output
, owidth
* ( oheight
+ 1 ) * 2, ( mlt_destructor
)mlt_pool_release
, NULL
);
823 mlt_properties_set_int( properties
, "width", owidth
);
824 mlt_properties_set_int( properties
, "height", oheight
);
826 // We should resize the alpha too
827 alpha
= mlt_resize_alpha( alpha
, owidth
, oheight
, iwidth
, iheight
);
830 mlt_properties_set_data( properties
, "alpha", alpha
, owidth
* ( oheight
+ 1 ), ( mlt_destructor
)mlt_pool_release
, NULL
);
831 this->get_alpha_mask
= NULL
;
837 // No change, return input
841 /** A rescaling function for yuv422 frames - low quality, and provided for testing
842 only. It assumes yuv422 images available on the frame so use with care.
845 uint8_t *mlt_frame_rescale_yuv422( mlt_frame
this, int owidth
, int oheight
)
848 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
850 // Get the input image, width and height
851 uint8_t *input
= mlt_properties_get_data( properties
, "image", NULL
);
852 int iwidth
= mlt_properties_get_int( properties
, "width" );
853 int iheight
= mlt_properties_get_int( properties
, "height" );
855 // If width and height are correct, don't do anything
856 if ( iwidth
!= owidth
|| iheight
!= oheight
)
858 // Create the output image
859 uint8_t *output
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) * 2 );
862 int istride
= iwidth
* 2;
863 int ostride
= owidth
* 2;
865 iwidth
= iwidth
- ( iwidth
% 4 );
867 // Derived coordinates
871 int out_x_range
= owidth
/ 2;
872 int out_y_range
= oheight
/ 2;
873 int in_x_range
= iwidth
/ 2;
874 int in_y_range
= iheight
/ 2;
877 register uint8_t *out_line
= output
;
878 register uint8_t *out_ptr
;
880 // Calculate a middle pointer
881 uint8_t *in_middle
= input
+ istride
* in_y_range
+ in_x_range
* 2;
884 // Generate the affine transform scaling values
885 register int scale_width
= ( iwidth
<< 16 ) / owidth
;
886 register int scale_height
= ( iheight
<< 16 ) / oheight
;
887 register int base
= 0;
889 int outer
= out_x_range
* scale_width
;
890 int bottom
= out_y_range
* scale_height
;
892 // Loop for the entirety of our output height.
893 for ( dy
= - bottom
; dy
< bottom
; dy
+= scale_height
)
895 // Start at the beginning of the line
898 // Pointer to the middle of the input line
899 in_line
= in_middle
+ ( dy
>> 16 ) * istride
;
901 // Loop for the entirety of our output row.
902 for ( dx
= - outer
; dx
< outer
; dx
+= scale_width
)
906 *out_ptr
++ = *( in_line
+ base
);
908 *out_ptr
++ = *( in_line
+ base
+ 1 );
912 *out_ptr
++ = *( in_line
+ base
);
914 *out_ptr
++ = *( in_line
+ base
+ 3 );
917 // Move to next output line
921 // Now update the frame
922 mlt_properties_set_data( properties
, "image", output
, owidth
* ( oheight
+ 1 ) * 2, ( mlt_destructor
)mlt_pool_release
, NULL
);
923 mlt_properties_set_int( properties
, "width", owidth
);
924 mlt_properties_set_int( properties
, "height", oheight
);
930 // No change, return input
934 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
)
938 int frequency_src
= *frequency
, frequency_dest
= *frequency
;
939 int channels_src
= *channels
, channels_dest
= *channels
;
940 int samples_src
= *samples
, samples_dest
= *samples
;
944 mlt_frame_get_audio( this, &dest
, format
, &frequency_dest
, &channels_dest
, &samples_dest
);
945 mlt_frame_get_audio( that
, &src
, format
, &frequency_src
, &channels_src
, &samples_src
);
947 int silent
= mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "silent_audio" );
948 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "silent_audio", 0 );
950 memset( dest
, 0, samples_dest
* channels_dest
* sizeof( int16_t ) );
952 silent
= mlt_properties_get_int( MLT_FRAME_PROPERTIES( that
), "silent_audio" );
953 mlt_properties_set_int( MLT_FRAME_PROPERTIES( that
), "silent_audio", 0 );
955 memset( src
, 0, samples_src
* channels_src
* sizeof( int16_t ) );
957 if ( channels_src
> 6 )
959 if ( channels_dest
> 6 )
961 if ( samples_src
> 4000 )
963 if ( samples_dest
> 4000 )
966 // determine number of samples to process
967 *samples
= samples_src
< samples_dest ? samples_src
: samples_dest
;
968 *channels
= channels_src
< channels_dest ? channels_src
: channels_dest
;
970 *frequency
= frequency_dest
;
972 // Compute a smooth ramp over start to end
973 float weight
= weight_start
;
974 float weight_step
= ( weight_end
- weight_start
) / *samples
;
977 for ( i
= 0; i
< *samples
; i
++ )
979 for ( j
= 0; j
< *channels
; j
++ )
981 if ( j
< channels_dest
)
982 d
= (double) dest
[ i
* channels_dest
+ j
];
983 if ( j
< channels_src
)
984 s
= (double) src
[ i
* channels_src
+ j
];
985 dest
[ i
* channels_dest
+ j
] = s
* weight
+ d
* ( 1.0 - weight
);
987 weight
+= weight_step
;
993 int mlt_sample_calculator( float fps
, int frequency
, int64_t position
)
997 if ( ( int )( fps
* 100 ) == 2997 )
999 samples
= frequency
/ 30;
1001 switch ( frequency
)
1004 if ( position
% 5 != 0 )
1008 if ( position
% 300 == 0 )
1010 else if ( position
% 30 == 0 )
1012 else if ( position
% 2 == 0 )
1018 if ( position
% 30 == 0 )
1020 else if ( position
% 29 == 0 )
1022 else if ( position
% 4 == 2 )
1031 else if ( fps
!= 0 )
1033 samples
= frequency
/ fps
;