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 than test audio.
98 int mlt_frame_is_test_audio( mlt_frame
this )
100 return this->get_audio
== NULL
|| 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 int mlt_frame_get_image( mlt_frame
this, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
210 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
211 mlt_get_image get_image
= mlt_frame_pop_get_image( this );
212 mlt_producer producer
= mlt_properties_get_data( properties
, "test_card_producer", NULL
);
214 *width
= *width
>> 1 << 1;
216 if ( get_image
!= NULL
)
219 mlt_position position
= mlt_frame_get_position( this );
220 error
= get_image( this, buffer
, format
, width
, height
, writable
);
221 mlt_frame_set_position( this, position
);
224 else if ( mlt_properties_get_data( properties
, "image", NULL
) != NULL
)
226 *format
= mlt_image_yuv422
;
227 *buffer
= mlt_properties_get_data( properties
, "image", NULL
);
228 *width
= mlt_properties_get_int( properties
, "width" );
229 *height
= mlt_properties_get_int( properties
, "height" );
231 else if ( producer
!= NULL
)
233 mlt_frame test_frame
= NULL
;
234 mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer
), &test_frame
, 0 );
235 if ( test_frame
!= NULL
)
237 mlt_properties test_properties
= MLT_FRAME_PROPERTIES( test_frame
);
238 mlt_properties_set_double( test_properties
, "consumer_aspect_ratio", mlt_properties_get_double( properties
, "consumer_aspect_ratio" ) );
239 mlt_properties_set( test_properties
, "rescale.interp", mlt_properties_get( properties
, "rescale.interp" ) );
240 mlt_frame_get_image( test_frame
, buffer
, format
, width
, height
, writable
);
241 mlt_properties_set_data( properties
, "test_card_frame", test_frame
, 0, ( mlt_destructor
)mlt_frame_close
, NULL
);
242 mlt_properties_set_data( properties
, "image", *buffer
, *width
* *height
* 2, NULL
, NULL
);
243 mlt_properties_set_int( properties
, "width", *width
);
244 mlt_properties_set_int( properties
, "height", *height
);
245 mlt_properties_set_double( properties
, "aspect_ratio", mlt_frame_get_aspect_ratio( test_frame
) );
249 mlt_properties_set_data( properties
, "test_card_producer", NULL
, 0, NULL
, NULL
);
250 mlt_frame_get_image( this, buffer
, format
, width
, height
, writable
);
259 *width
= *width
== 0 ?
720 : *width
;
260 *height
= *height
== 0 ?
576 : *height
;
261 size
= *width
* *height
;
263 mlt_properties_set_int( properties
, "width", *width
);
264 mlt_properties_set_int( properties
, "height", *height
);
265 mlt_properties_set_int( properties
, "aspect_ratio", 1 );
273 case mlt_image_rgb24
:
276 *buffer
= mlt_pool_alloc( size
);
278 memset( *buffer
, 255, size
);
280 case mlt_image_rgb24a
:
283 *buffer
= mlt_pool_alloc( size
);
285 memset( *buffer
, 255, size
);
287 case mlt_image_yuv422
:
290 *buffer
= mlt_pool_alloc( size
);
293 while ( p
!= NULL
&& p
!= q
)
299 case mlt_image_yuv420p
:
301 *buffer
= mlt_pool_alloc( size
);
303 memset( *buffer
, 255, size
);
307 mlt_properties_set_data( properties
, "image", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
308 mlt_properties_set_int( properties
, "test_image", 1 );
314 uint8_t *mlt_frame_get_alpha_mask( mlt_frame
this )
316 if ( this != NULL
&& this->get_alpha_mask
!= NULL
)
317 return this->get_alpha_mask( this );
318 return this == NULL ? NULL
: mlt_properties_get_data( &this->parent
, "alpha", NULL
);
321 int mlt_frame_get_audio( mlt_frame
this, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
323 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
324 int hide
= mlt_properties_get_int( properties
, "test_audio" );
326 if ( hide
== 0 && this->get_audio
!= NULL
)
328 mlt_position position
= mlt_frame_get_position( this );
329 this->get_audio( this, buffer
, format
, frequency
, channels
, samples
);
330 mlt_frame_set_position( this, position
);
332 else if ( mlt_properties_get_data( properties
, "audio", NULL
) )
334 *buffer
= mlt_properties_get_data( properties
, "audio", NULL
);
335 *frequency
= mlt_properties_get_int( properties
, "audio_frequency" );
336 *channels
= mlt_properties_get_int( properties
, "audio_channels" );
337 *samples
= mlt_properties_get_int( properties
, "audio_samples" );
342 *samples
= *samples
<= 0 ?
1920 : *samples
;
343 *channels
= *channels
<= 0 ?
2 : *channels
;
344 *frequency
= *frequency
<= 0 ?
48000 : *frequency
;
345 size
= *samples
* *channels
* sizeof( int16_t );
346 *buffer
= mlt_pool_alloc( size
);
347 if ( *buffer
!= NULL
)
348 memset( *buffer
, 0, size
);
349 mlt_properties_set_data( properties
, "audio", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
350 mlt_properties_set_int( properties
, "test_audio", 1 );
353 mlt_properties_set_int( properties
, "audio_frequency", *frequency
);
354 mlt_properties_set_int( properties
, "audio_channels", *channels
);
355 mlt_properties_set_int( properties
, "audio_samples", *samples
);
357 if ( mlt_properties_get( properties
, "meta.volume" ) )
359 double value
= mlt_properties_get_double( properties
, "meta.volume" );
362 memset( *buffer
, 0, *samples
* *channels
* 2 );
363 mlt_properties_set_double( properties
, "meta.volume", 1.0 );
365 else if ( value
!= 1.0 )
367 int total
= *samples
* *channels
;
368 int16_t *p
= *buffer
;
374 mlt_properties_set_double( properties
, "meta.volume", 1.0 );
381 unsigned char *mlt_frame_get_waveform( mlt_frame
this, int w
, int h
)
384 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
385 mlt_audio_format format
= mlt_audio_pcm
;
386 int frequency
= 32000; // lower frequency available?
388 double fps
= mlt_properties_get_double( properties
, "fps" );
389 int samples
= mlt_sample_calculator( fps
, frequency
, mlt_frame_get_position( this ) );
392 mlt_frame_get_audio( this, &pcm
, &format
, &frequency
, &channels
, &samples
);
394 // Make an 8-bit buffer large enough to hold rendering
396 unsigned char *bitmap
= ( unsigned char* )mlt_pool_alloc( size
);
397 if ( bitmap
!= NULL
)
398 memset( bitmap
, 0, size
);
399 mlt_properties_set_data( properties
, "waveform", bitmap
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
401 // Render vertical lines
402 int16_t *ubound
= pcm
+ samples
* channels
;
403 int skip
= samples
/ w
- 1;
406 // Iterate sample stream and along x coordinate
407 for ( i
= 0; i
< w
&& pcm
< ubound
; i
++ )
409 // pcm data has channels interleaved
410 for ( j
= 0; j
< channels
; j
++ )
412 // Determine sample's magnitude from 2s complement;
413 int pcm_magnitude
= *pcm
< 0 ?
~(*pcm
) + 1 : *pcm
;
414 // The height of a line is the ratio of the magnitude multiplied by
415 // half the vertical resolution
416 int height
= ( int )( ( double )( pcm_magnitude
) / 32768 * h
/ 2 );
417 // Determine the starting y coordinate - left channel above center,
418 // right channel below - currently assumes 2 channels
419 int displacement
= ( h
/ 2 ) - ( 1 - j
) * height
;
420 // Position buffer pointer using y coordinate, stride, and x coordinate
421 unsigned char *p
= &bitmap
[ i
+ displacement
* w
];
423 // Draw vertical line
424 for ( k
= 0; k
< height
; k
++ )
429 pcm
+= skip
* channels
;
435 mlt_producer
mlt_frame_get_original_producer( mlt_frame
this )
438 return mlt_properties_get_data( MLT_FRAME_PROPERTIES( this ), "_producer", NULL
);
442 void mlt_frame_close( mlt_frame
this )
444 if ( this != NULL
&& mlt_properties_dec_ref( MLT_FRAME_PROPERTIES( this ) ) <= 0 )
446 mlt_deque_close( this->stack_image
);
447 mlt_deque_close( this->stack_audio
);
448 while( mlt_deque_peek_back( this->stack_service
) )
449 mlt_service_close( mlt_deque_pop_back( this->stack_service
) );
450 mlt_deque_close( this->stack_service
);
451 mlt_properties_close( &this->parent
);
456 /***** convenience functions *****/
458 int mlt_convert_rgb24a_to_yuv422( uint8_t *rgba
, int width
, int height
, int stride
, uint8_t *yuv
, uint8_t *alpha
)
461 register int y0
, y1
, u0
, u1
, v0
, v1
;
462 register int r
, g
, b
;
463 register uint8_t *d
= yuv
;
466 for ( i
= 0; i
< height
; i
++ )
468 register uint8_t *s
= rgba
+ ( stride
* i
);
469 for ( j
= 0; j
< ( width
/ 2 ); j
++ )
475 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
480 RGB2YUV (r
, g
, b
, y1
, u1
, v1
);
492 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
500 int mlt_convert_rgb24_to_yuv422( uint8_t *rgb
, int width
, int height
, int stride
, uint8_t *yuv
)
503 register int y0
, y1
, u0
, u1
, v0
, v1
;
504 register int r
, g
, b
;
505 register uint8_t *d
= yuv
;
508 for ( i
= 0; i
< height
; i
++ )
510 register uint8_t *s
= rgb
+ ( stride
* i
);
511 for ( j
= 0; j
< ( width
/ 2 ); j
++ )
516 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
520 RGB2YUV (r
, g
, b
, y1
, u1
, v1
);
531 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
539 int mlt_convert_yuv420p_to_yuv422( uint8_t *yuv420p
, int width
, int height
, int stride
, uint8_t *yuv
)
544 int half
= width
>> 1;
546 uint8_t *Y
= yuv420p
;
547 uint8_t *U
= Y
+ width
* height
;
548 uint8_t *V
= U
+ width
* height
/ 4;
550 register uint8_t *d
= yuv
;
552 for ( i
= 0; i
< height
; i
++ )
554 register uint8_t *u
= U
+ ( i
/ 2 ) * ( half
);
555 register uint8_t *v
= V
+ ( i
/ 2 ) * ( half
);
557 for ( j
= 0; j
< half
; j
++ )
568 uint8_t *mlt_resize_alpha( uint8_t *input
, int owidth
, int oheight
, int iwidth
, int iheight
)
570 uint8_t *output
= NULL
;
572 if ( input
!= NULL
&& ( iwidth
!= owidth
|| iheight
!= oheight
) )
574 iwidth
= iwidth
- ( iwidth
% 2 );
575 owidth
= owidth
- ( owidth
% 2 );
577 output
= mlt_pool_alloc( owidth
* oheight
);
579 // Coordinates (0,0 is middle of output)
583 int out_x_range
= owidth
/ 2;
584 int out_y_range
= oheight
/ 2;
585 int in_x_range
= iwidth
/ 2 < out_x_range ? iwidth
/ 2 : out_x_range
;
586 int in_y_range
= iheight
/ 2 < out_y_range ? iheight
/ 2 : out_y_range
;
589 uint8_t *out_line
= output
;
590 uint8_t *out_ptr
= out_line
;
592 // Calculate a middle and possibly invalid pointer in the input
593 uint8_t *in_middle
= input
+ iwidth
* ( iheight
/ 2 ) + ( iwidth
/ 2 );
594 int in_line
= - in_y_range
* iwidth
- in_x_range
;
598 // Fill whole section with black
599 y
= out_y_range
- ( iheight
/ 2 );
600 int blank_elements
= owidth
* y
;
601 elements
= blank_elements
;
602 while ( elements
-- )
605 int active_width
= iwidth
;
606 int inactive_width
= out_x_range
- in_x_range
;
610 // Loop for the entirety of our output height.
613 // Start at the beginning of the line
616 // Fill the outer part with black
617 elements
= inactive_width
;
618 while ( elements
-- )
621 // We're in the input range for this row.
622 p
= in_middle
+ in_line
;
623 end
= out_ptr
+ active_width
;
624 while ( out_ptr
!= end
)
627 // Fill the outer part with black
628 elements
= inactive_width
;
629 while ( elements
-- )
632 // Move to next input line
635 // Move to next output line
639 // Fill whole section with black
640 elements
= blank_elements
;
641 while ( elements
-- )
648 void mlt_resize_yuv422( uint8_t *output
, int owidth
, int oheight
, uint8_t *input
, int iwidth
, int iheight
)
651 int istride
= iwidth
* 2;
652 int ostride
= owidth
* 2;
654 iwidth
= iwidth
- ( iwidth
% 4 );
655 owidth
= owidth
- ( owidth
% 4 );
656 //iheight = iheight - ( iheight % 2 );
657 //oheight = oheight - ( oheight % 2 );
659 // Optimisation point
660 if ( iwidth
== owidth
&& iheight
== oheight
)
661 memcpy( output
, input
, iheight
* istride
);
663 // Coordinates (0,0 is middle of output)
667 int out_x_range
= owidth
/ 2;
668 int out_y_range
= oheight
/ 2;
669 int in_x_range
= iwidth
/ 2 < out_x_range ? iwidth
/ 2 : out_x_range
;
670 int in_y_range
= iheight
/ 2 < out_y_range ? iheight
/ 2 : out_y_range
;
673 uint8_t *out_line
= output
;
674 uint8_t *out_ptr
= out_line
;
676 // Calculate a middle and possibly invalid pointer in the input
677 uint8_t *in_middle
= input
+ istride
* ( iheight
/ 2 ) + ( iwidth
/ 2 ) * 2;
678 int in_line
= - in_y_range
* istride
- in_x_range
* 2;
682 // Fill whole section with black
683 y
= out_y_range
- ( iheight
/ 2 );
684 int blank_elements
= ostride
* y
/ 2;
685 elements
= blank_elements
;
686 while ( elements
-- )
692 int active_width
= 2 * iwidth
;
693 int inactive_width
= out_x_range
- in_x_range
;
697 // Loop for the entirety of our output height.
700 // Start at the beginning of the line
703 // Fill the outer part with black
704 elements
= inactive_width
;
705 while ( elements
-- )
711 // We're in the input range for this row.
712 p
= in_middle
+ in_line
;
713 end
= out_ptr
+ active_width
;
714 while ( out_ptr
!= end
)
720 // Fill the outer part with black
721 elements
= inactive_width
;
722 while ( elements
-- )
728 // Move to next input line
731 // Move to next output line
735 // Fill whole section with black
736 elements
= blank_elements
;
737 while ( elements
-- )
744 /** A resizing function for yuv422 frames - this does not rescale, but simply
745 resizes. It assumes yuv422 images available on the frame so use with care.
748 uint8_t *mlt_frame_resize_yuv422( mlt_frame
this, int owidth
, int oheight
)
751 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
753 // Get the input image, width and height
754 uint8_t *input
= mlt_properties_get_data( properties
, "image", NULL
);
755 uint8_t *alpha
= mlt_frame_get_alpha_mask( this );
757 int iwidth
= mlt_properties_get_int( properties
, "width" );
758 int iheight
= mlt_properties_get_int( properties
, "height" );
760 // If width and height are correct, don't do anything
761 if ( iwidth
!= owidth
|| iheight
!= oheight
)
763 // Create the output image
764 uint8_t *output
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) * 2 );
766 // Call the generic resize
767 mlt_resize_yuv422( output
, owidth
, oheight
, input
, iwidth
, iheight
);
769 // Now update the frame
770 mlt_properties_set_data( properties
, "image", output
, owidth
* ( oheight
+ 1 ) * 2, ( mlt_destructor
)mlt_pool_release
, NULL
);
771 mlt_properties_set_int( properties
, "width", owidth
);
772 mlt_properties_set_int( properties
, "height", oheight
);
774 // We should resize the alpha too
775 alpha
= mlt_resize_alpha( alpha
, owidth
, oheight
, iwidth
, iheight
);
778 mlt_properties_set_data( properties
, "alpha", alpha
, owidth
* ( oheight
+ 1 ), ( mlt_destructor
)mlt_pool_release
, NULL
);
779 this->get_alpha_mask
= NULL
;
785 // No change, return input
789 /** A rescaling function for yuv422 frames - low quality, and provided for testing
790 only. It assumes yuv422 images available on the frame so use with care.
793 uint8_t *mlt_frame_rescale_yuv422( mlt_frame
this, int owidth
, int oheight
)
796 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
798 // Get the input image, width and height
799 uint8_t *input
= mlt_properties_get_data( properties
, "image", NULL
);
800 int iwidth
= mlt_properties_get_int( properties
, "width" );
801 int iheight
= mlt_properties_get_int( properties
, "height" );
803 // If width and height are correct, don't do anything
804 if ( iwidth
!= owidth
|| iheight
!= oheight
)
806 // Create the output image
807 uint8_t *output
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) * 2 );
810 int istride
= iwidth
* 2;
811 int ostride
= owidth
* 2;
813 iwidth
= iwidth
- ( iwidth
% 4 );
815 // Derived coordinates
819 int out_x_range
= owidth
/ 2;
820 int out_y_range
= oheight
/ 2;
821 int in_x_range
= iwidth
/ 2;
822 int in_y_range
= iheight
/ 2;
825 register uint8_t *out_line
= output
;
826 register uint8_t *out_ptr
;
828 // Calculate a middle pointer
829 uint8_t *in_middle
= input
+ istride
* in_y_range
+ in_x_range
* 2;
832 // Generate the affine transform scaling values
833 register int scale_width
= ( iwidth
<< 16 ) / owidth
;
834 register int scale_height
= ( iheight
<< 16 ) / oheight
;
835 register int base
= 0;
837 int outer
= out_x_range
* scale_width
;
838 int bottom
= out_y_range
* scale_height
;
840 // Loop for the entirety of our output height.
841 for ( dy
= - bottom
; dy
< bottom
; dy
+= scale_height
)
843 // Start at the beginning of the line
846 // Pointer to the middle of the input line
847 in_line
= in_middle
+ ( dy
>> 16 ) * istride
;
849 // Loop for the entirety of our output row.
850 for ( dx
= - outer
; dx
< outer
; dx
+= scale_width
)
854 *out_ptr
++ = *( in_line
+ base
);
856 *out_ptr
++ = *( in_line
+ base
+ 1 );
860 *out_ptr
++ = *( in_line
+ base
);
862 *out_ptr
++ = *( in_line
+ base
+ 3 );
865 // Move to next output line
869 // Now update the frame
870 mlt_properties_set_data( properties
, "image", output
, owidth
* ( oheight
+ 1 ) * 2, ( mlt_destructor
)mlt_pool_release
, NULL
);
871 mlt_properties_set_int( properties
, "width", owidth
);
872 mlt_properties_set_int( properties
, "height", oheight
);
878 // No change, return input
882 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
)
886 int frequency_src
= *frequency
, frequency_dest
= *frequency
;
887 int channels_src
= *channels
, channels_dest
= *channels
;
888 int samples_src
= *samples
, samples_dest
= *samples
;
892 mlt_frame_get_audio( this, &dest
, format
, &frequency_dest
, &channels_dest
, &samples_dest
);
893 mlt_frame_get_audio( that
, &src
, format
, &frequency_src
, &channels_src
, &samples_src
);
895 int silent
= mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "silent_audio" );
896 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "silent_audio", 0 );
898 memset( dest
, 0, samples_dest
* channels_dest
* sizeof( int16_t ) );
900 silent
= mlt_properties_get_int( MLT_FRAME_PROPERTIES( that
), "silent_audio" );
901 mlt_properties_set_int( MLT_FRAME_PROPERTIES( that
), "silent_audio", 0 );
903 memset( src
, 0, samples_src
* channels_src
* sizeof( int16_t ) );
905 if ( channels_src
> 6 )
907 if ( channels_dest
> 6 )
909 if ( samples_src
> 4000 )
911 if ( samples_dest
> 4000 )
914 // determine number of samples to process
915 *samples
= samples_src
< samples_dest ? samples_src
: samples_dest
;
916 *channels
= channels_src
< channels_dest ? channels_src
: channels_dest
;
918 *frequency
= frequency_dest
;
920 // Compute a smooth ramp over start to end
921 float weight
= weight_start
;
922 float weight_step
= ( weight_end
- weight_start
) / *samples
;
925 for ( i
= 0; i
< *samples
; i
++ )
927 for ( j
= 0; j
< *channels
; j
++ )
929 if ( j
< channels_dest
)
930 d
= (double) dest
[ i
* channels_dest
+ j
];
931 if ( j
< channels_src
)
932 s
= (double) src
[ i
* channels_src
+ j
];
933 dest
[ i
* channels_dest
+ j
] = s
* weight
+ d
* ( 1.0 - weight
);
935 weight
+= weight_step
;
941 int mlt_sample_calculator( float fps
, int frequency
, int64_t position
)
945 if ( ( int )( fps
* 100 ) == 2997 )
947 samples
= frequency
/ 30;
952 if ( position
% 5 != 0 )
956 if ( position
% 300 == 0 )
958 else if ( position
% 30 == 0 )
960 else if ( position
% 2 == 0 )
966 if ( position
% 30 == 0 )
968 else if ( position
% 29 == 0 )
970 else if ( position
% 4 == 2 )
981 samples
= frequency
/ fps
;