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;