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 );
266 *width = *width >> 1 << 1;
268 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 );
276 else if ( mlt_properties_get_data( properties, "image", NULL ) != NULL )
278 *format = mlt_image_yuv422;
279 *buffer = mlt_properties_get_data( properties, "image", NULL );
280 *width = mlt_properties_get_int( properties, "width" );
281 *height = mlt_properties_get_int( properties, "height" );
283 else if ( producer != NULL )
285 mlt_frame test_frame = NULL;
286 mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), &test_frame, 0 );
287 if ( test_frame != NULL )
289 mlt_properties test_properties = MLT_FRAME_PROPERTIES( test_frame );
290 mlt_properties_set_double( test_properties, "consumer_aspect_ratio", mlt_properties_get_double( properties, "consumer_aspect_ratio" ) );
291 mlt_properties_set( test_properties, "rescale.interp", mlt_properties_get( properties, "rescale.interp" ) );
292 mlt_frame_get_image( test_frame, buffer, format, width, height, writable );
293 mlt_properties_set_data( properties, "test_card_frame", test_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
294 mlt_properties_set_data( properties, "image", *buffer, *width * *height * 2, NULL, NULL );
295 mlt_properties_set_int( properties, "width", *width );
296 mlt_properties_set_int( properties, "height", *height );
297 mlt_properties_set_double( properties, "aspect_ratio", mlt_frame_get_aspect_ratio( test_frame ) );
301 mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
302 mlt_frame_get_image( this, buffer, format, width, height, writable );
311 *width = *width == 0 ? 720 : *width;
312 *height = *height == 0 ? 576 : *height;
313 size = *width * *height;
315 mlt_properties_set_int( properties, "width", *width );
316 mlt_properties_set_int( properties, "height", *height );
317 mlt_properties_set_int( properties, "aspect_ratio", 1 );
325 case mlt_image_rgb24:
328 *buffer = mlt_pool_alloc( size );
330 memset( *buffer, 255, size );
332 case mlt_image_rgb24a:
335 *buffer = mlt_pool_alloc( size );
337 memset( *buffer, 255, size );
339 case mlt_image_yuv422:
342 *buffer = mlt_pool_alloc( size );
345 while ( p != NULL && p != q )
351 case mlt_image_yuv420p:
353 *buffer = mlt_pool_alloc( size );
355 memset( *buffer, 255, size );
359 mlt_properties_set_data( properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
360 mlt_properties_set_int( properties, "test_image", 1 );
366 uint8_t *mlt_frame_get_alpha_mask( mlt_frame this )
368 if ( this != NULL && this->get_alpha_mask != NULL )
369 return this->get_alpha_mask( this );
370 return this == NULL ? NULL : mlt_properties_get_data( &this->parent, "alpha", NULL );
373 int mlt_frame_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
375 mlt_get_audio get_audio = mlt_frame_pop_audio( this );
376 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
377 int hide = mlt_properties_get_int( properties, "test_audio" );
379 if ( hide == 0 && get_audio != NULL )
381 mlt_position position = mlt_frame_get_position( this );
382 get_audio( this, buffer, format, frequency, channels, samples );
383 mlt_frame_set_position( this, position );
385 else if ( mlt_properties_get_data( properties, "audio", NULL ) )
387 *buffer = mlt_properties_get_data( properties, "audio", NULL );
388 *frequency = mlt_properties_get_int( properties, "audio_frequency" );
389 *channels = mlt_properties_get_int( properties, "audio_channels" );
390 *samples = mlt_properties_get_int( properties, "audio_samples" );
395 *samples = *samples <= 0 ? 1920 : *samples;
396 *channels = *channels <= 0 ? 2 : *channels;
397 *frequency = *frequency <= 0 ? 48000 : *frequency;
398 size = *samples * *channels * sizeof( int16_t );
399 *buffer = mlt_pool_alloc( size );
400 if ( *buffer != NULL )
401 memset( *buffer, 0, size );
402 mlt_properties_set_data( properties, "audio", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
403 mlt_properties_set_int( properties, "test_audio", 1 );
406 mlt_properties_set_int( properties, "audio_frequency", *frequency );
407 mlt_properties_set_int( properties, "audio_channels", *channels );
408 mlt_properties_set_int( properties, "audio_samples", *samples );
410 if ( mlt_properties_get( properties, "meta.volume" ) )
412 double value = mlt_properties_get_double( properties, "meta.volume" );
415 memset( *buffer, 0, *samples * *channels * 2 );
416 mlt_properties_set_double( properties, "meta.volume", 1.0 );
418 else if ( value != 1.0 )
420 int total = *samples * *channels;
421 int16_t *p = *buffer;
427 mlt_properties_set_double( properties, "meta.volume", 1.0 );
434 unsigned char *mlt_frame_get_waveform( mlt_frame this, int w, int h )
437 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
438 mlt_audio_format format = mlt_audio_pcm;
439 int frequency = 32000; // lower frequency available?
441 double fps = mlt_properties_get_double( properties, "fps" );
442 int samples = mlt_sample_calculator( fps, frequency, mlt_frame_get_position( this ) );
445 mlt_frame_get_audio( this, &pcm, &format, &frequency, &channels, &samples );
447 // Make an 8-bit buffer large enough to hold rendering
449 unsigned char *bitmap = ( unsigned char* )mlt_pool_alloc( size );
450 if ( bitmap != NULL )
451 memset( bitmap, 0, size );
452 mlt_properties_set_data( properties, "waveform", bitmap, size, ( mlt_destructor )mlt_pool_release, NULL );
454 // Render vertical lines
455 int16_t *ubound = pcm + samples * channels;
456 int skip = samples / w - 1;
459 // Iterate sample stream and along x coordinate
460 for ( i = 0; i < w && pcm < ubound; i++ )
462 // pcm data has channels interleaved
463 for ( j = 0; j < channels; j++ )
465 // Determine sample's magnitude from 2s complement;
466 int pcm_magnitude = *pcm < 0 ? ~(*pcm) + 1 : *pcm;
467 // The height of a line is the ratio of the magnitude multiplied by
468 // half the vertical resolution
469 int height = ( int )( ( double )( pcm_magnitude ) / 32768 * h / 2 );
470 // Determine the starting y coordinate - left channel above center,
471 // right channel below - currently assumes 2 channels
472 int displacement = ( h / 2 ) - ( 1 - j ) * height;
473 // Position buffer pointer using y coordinate, stride, and x coordinate
474 unsigned char *p = &bitmap[ i + displacement * w ];
476 // Draw vertical line
477 for ( k = 0; k < height; k++ )
482 pcm += skip * channels;
488 mlt_producer mlt_frame_get_original_producer( mlt_frame this )
491 return mlt_properties_get_data( MLT_FRAME_PROPERTIES( this ), "_producer", NULL );
495 void mlt_frame_close( mlt_frame this )
497 if ( this != NULL && mlt_properties_dec_ref( MLT_FRAME_PROPERTIES( this ) ) <= 0 )
499 mlt_deque_close( this->stack_image );
500 mlt_deque_close( this->stack_audio );
501 while( mlt_deque_peek_back( this->stack_service ) )
502 mlt_service_close( mlt_deque_pop_back( this->stack_service ) );
503 mlt_deque_close( this->stack_service );
504 mlt_properties_close( &this->parent );
509 /***** convenience functions *****/
511 int mlt_convert_rgb24a_to_yuv422( uint8_t *rgba, int width, int height, int stride, uint8_t *yuv, uint8_t *alpha )
514 register int y0, y1, u0, u1, v0, v1;
515 register int r, g, b;
516 register uint8_t *d = yuv;
519 for ( i = 0; i < height; i++ )
521 register uint8_t *s = rgba + ( stride * i );
522 for ( j = 0; j < ( width / 2 ); j++ )
528 RGB2YUV (r, g, b, y0, u0 , v0);
533 RGB2YUV (r, g, b, y1, u1 , v1);
545 RGB2YUV (r, g, b, y0, u0 , v0);
553 int mlt_convert_rgb24_to_yuv422( uint8_t *rgb, int width, int height, int stride, uint8_t *yuv )
556 register int y0, y1, u0, u1, v0, v1;
557 register int r, g, b;
558 register uint8_t *d = yuv;
561 for ( i = 0; i < height; i++ )
563 register uint8_t *s = rgb + ( stride * i );
564 for ( j = 0; j < ( width / 2 ); j++ )
569 RGB2YUV (r, g, b, y0, u0 , v0);
573 RGB2YUV (r, g, b, y1, u1 , v1);
584 RGB2YUV (r, g, b, y0, u0 , v0);
592 int mlt_convert_yuv420p_to_yuv422( uint8_t *yuv420p, int width, int height, int stride, uint8_t *yuv )
597 int half = width >> 1;
599 uint8_t *Y = yuv420p;
600 uint8_t *U = Y + width * height;
601 uint8_t *V = U + width * height / 4;
603 register uint8_t *d = yuv;
605 for ( i = 0; i < height; i++ )
607 register uint8_t *u = U + ( i / 2 ) * ( half );
608 register uint8_t *v = V + ( i / 2 ) * ( half );
610 for ( j = 0; j < half; j++ )
621 uint8_t *mlt_resize_alpha( uint8_t *input, int owidth, int oheight, int iwidth, int iheight )
623 uint8_t *output = NULL;
625 if ( input != NULL && ( iwidth != owidth || iheight != oheight ) && ( owidth > 6 && oheight > 6 ) )
627 iwidth = iwidth - ( iwidth % 2 );
628 owidth = owidth - ( owidth % 2 );
630 output = mlt_pool_alloc( owidth * oheight );
632 // Coordinates (0,0 is middle of output)
636 int out_x_range = owidth / 2;
637 int out_y_range = oheight / 2;
638 int in_x_range = iwidth / 2 < out_x_range ? iwidth / 2 : out_x_range;
639 int in_y_range = iheight / 2 < out_y_range ? iheight / 2 : out_y_range;
642 uint8_t *out_line = output;
643 uint8_t *out_ptr = out_line;
645 // Calculate a middle and possibly invalid pointer in the input
646 uint8_t *in_middle = input + iwidth * ( iheight / 2 ) + ( iwidth / 2 );
647 int in_line = - in_y_range * iwidth - in_x_range;
651 // Fill whole section with black
652 y = out_y_range - ( iheight / 2 );
653 int blank_elements = owidth * y;
654 elements = blank_elements;
655 while ( elements -- )
658 int active_width = iwidth;
659 int inactive_width = out_x_range - in_x_range;
663 // Loop for the entirety of our output height.
666 // Start at the beginning of the line
669 // Fill the outer part with black
670 elements = inactive_width;
671 while ( elements -- )
674 // We're in the input range for this row.
675 p = in_middle + in_line;
676 end = out_ptr + active_width;
677 while ( out_ptr != end )
680 // Fill the outer part with black
681 elements = inactive_width;
682 while ( elements -- )
685 // Move to next input line
688 // Move to next output line
692 // Fill whole section with black
693 elements = blank_elements;
694 while ( elements -- )
701 void mlt_resize_yuv422( uint8_t *output, int owidth, int oheight, uint8_t *input, int iwidth, int iheight )
704 int istride = iwidth * 2;
705 int ostride = owidth * 2;
707 iwidth = iwidth - ( iwidth % 2 );
708 owidth = owidth - ( owidth % 2 );
709 //iheight = iheight - ( iheight % 2 );
710 //oheight = oheight - ( oheight % 2 );
712 // Optimisation point
713 if ( output == NULL || input == NULL || ( owidth <= 6 || oheight <= 6 || iwidth <= 6 || oheight <= 6 ) )
717 else if ( iwidth == owidth && iheight == oheight )
719 memcpy( output, input, iheight * istride );
723 // Coordinates (0,0 is middle of output)
727 int out_x_range = owidth / 2;
728 int out_y_range = oheight / 2;
729 int in_x_range = iwidth / 2 < out_x_range ? iwidth / 2 : out_x_range;
730 int in_y_range = iheight / 2 < out_y_range ? iheight / 2 : out_y_range;
733 uint8_t *out_line = output;
734 uint8_t *out_ptr = out_line;
736 // Calculate a middle and possibly invalid pointer in the input
737 uint8_t *in_middle = input + istride * ( iheight / 2 ) + iwidth;
738 int in_line = - in_y_range * istride - in_x_range * 2;
742 // Fill whole section with black
743 y = out_y_range - ( iheight / 2 );
744 int blank_elements = ostride * y / 2;
745 elements = blank_elements;
746 while ( elements -- )
752 int active_width = 2 * iwidth;
753 int left_inactive_width = out_x_range - in_x_range;
754 int right_inactive_width = left_inactive_width;
762 right_inactive_width += 2;
765 // Loop for the entirety of our output height.
768 // Start at the beginning of the line
771 // Fill the outer part with black
772 elements = left_inactive_width;
773 while ( elements -- )
779 // We're in the input range for this row.
780 p = in_middle + in_line;
781 end = out_ptr + active_width;
782 while ( out_ptr != end )
788 // Fill the outer part with black
789 elements = right_inactive_width;
790 while ( elements -- )
796 // Move to next input line
799 // Move to next output line
803 // Fill whole section with black
804 elements = blank_elements;
805 while ( elements -- )
812 /** A resizing function for yuv422 frames - this does not rescale, but simply
813 resizes. It assumes yuv422 images available on the frame so use with care.
816 uint8_t *mlt_frame_resize_yuv422( mlt_frame this, int owidth, int oheight )
819 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
821 // Get the input image, width and height
822 uint8_t *input = mlt_properties_get_data( properties, "image", NULL );
823 uint8_t *alpha = mlt_frame_get_alpha_mask( this );
825 int iwidth = mlt_properties_get_int( properties, "width" );
826 int iheight = mlt_properties_get_int( properties, "height" );
828 // If width and height are correct, don't do anything
829 if ( iwidth != owidth || iheight != oheight )
831 // Create the output image
832 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
834 // Call the generic resize
835 mlt_resize_yuv422( output, owidth, oheight, input, iwidth, iheight );
837 // Now update the frame
838 mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
839 mlt_properties_set_int( properties, "width", owidth );
840 mlt_properties_set_int( properties, "height", oheight );
842 // We should resize the alpha too
843 alpha = mlt_resize_alpha( alpha, owidth, oheight, iwidth, iheight );
846 mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
847 this->get_alpha_mask = NULL;
853 // No change, return input
857 /** A rescaling function for yuv422 frames - low quality, and provided for testing
858 only. It assumes yuv422 images available on the frame so use with care.
861 uint8_t *mlt_frame_rescale_yuv422( mlt_frame this, int owidth, int oheight )
864 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
866 // Get the input image, width and height
867 uint8_t *input = mlt_properties_get_data( properties, "image", NULL );
868 int iwidth = mlt_properties_get_int( properties, "width" );
869 int iheight = mlt_properties_get_int( properties, "height" );
871 // If width and height are correct, don't do anything
872 if ( iwidth != owidth || iheight != oheight )
874 // Create the output image
875 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
878 int istride = iwidth * 2;
879 int ostride = owidth * 2;
881 iwidth = iwidth - ( iwidth % 4 );
883 // Derived coordinates
887 int out_x_range = owidth / 2;
888 int out_y_range = oheight / 2;
889 int in_x_range = iwidth / 2;
890 int in_y_range = iheight / 2;
893 register uint8_t *out_line = output;
894 register uint8_t *out_ptr;
896 // Calculate a middle pointer
897 uint8_t *in_middle = input + istride * in_y_range + in_x_range * 2;
900 // Generate the affine transform scaling values
901 register int scale_width = ( iwidth << 16 ) / owidth;
902 register int scale_height = ( iheight << 16 ) / oheight;
903 register int base = 0;
905 int outer = out_x_range * scale_width;
906 int bottom = out_y_range * scale_height;
908 // Loop for the entirety of our output height.
909 for ( dy = - bottom; dy < bottom; dy += scale_height )
911 // Start at the beginning of the line
914 // Pointer to the middle of the input line
915 in_line = in_middle + ( dy >> 16 ) * istride;
917 // Loop for the entirety of our output row.
918 for ( dx = - outer; dx < outer; dx += scale_width )
922 *out_ptr ++ = *( in_line + base );
924 *out_ptr ++ = *( in_line + base + 1 );
928 *out_ptr ++ = *( in_line + base );
930 *out_ptr ++ = *( in_line + base + 3 );
933 // Move to next output line
937 // Now update the frame
938 mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
939 mlt_properties_set_int( properties, "width", owidth );
940 mlt_properties_set_int( properties, "height", oheight );
946 // No change, return input
950 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 )
954 int frequency_src = *frequency, frequency_dest = *frequency;
955 int channels_src = *channels, channels_dest = *channels;
956 int samples_src = *samples, samples_dest = *samples;
960 mlt_frame_get_audio( this, &dest, format, &frequency_dest, &channels_dest, &samples_dest );
961 mlt_frame_get_audio( that, &src, format, &frequency_src, &channels_src, &samples_src );
963 int silent = mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "silent_audio" );
964 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "silent_audio", 0 );
966 memset( dest, 0, samples_dest * channels_dest * sizeof( int16_t ) );
968 silent = mlt_properties_get_int( MLT_FRAME_PROPERTIES( that ), "silent_audio" );
969 mlt_properties_set_int( MLT_FRAME_PROPERTIES( that ), "silent_audio", 0 );
971 memset( src, 0, samples_src * channels_src * sizeof( int16_t ) );
973 if ( channels_src > 6 )
975 if ( channels_dest > 6 )
977 if ( samples_src > 4000 )
979 if ( samples_dest > 4000 )
982 // determine number of samples to process
983 *samples = samples_src < samples_dest ? samples_src : samples_dest;
984 *channels = channels_src < channels_dest ? channels_src : channels_dest;
986 *frequency = frequency_dest;
988 // Compute a smooth ramp over start to end
989 float weight = weight_start;
990 float weight_step = ( weight_end - weight_start ) / *samples;
993 for ( i = 0; i < *samples; i++ )
995 for ( j = 0; j < *channels; j++ )
997 if ( j < channels_dest )
998 d = (double) dest[ i * channels_dest + j ];
999 if ( j < channels_src )
1000 s = (double) src[ i * channels_src + j ];
1001 dest[ i * channels_dest + j ] = s * weight + d * ( 1.0 - weight );
1003 weight += weight_step;
1009 int mlt_sample_calculator( float fps, int frequency, int64_t position )
1013 if ( ( int )( fps * 100 ) == 2997 )
1015 samples = frequency / 30;
1017 switch ( frequency )
1020 if ( position % 5 != 0 )
1024 if ( position % 300 == 0 )
1026 else if ( position % 30 == 0 )
1028 else if ( position % 2 == 0 )
1034 if ( position % 30 == 0 )
1036 else if ( position % 29 == 0 )
1038 else if ( position % 4 == 2 )
1047 else if ( fps != 0 )
1049 samples = frequency / fps;