3 * \brief interface for all frame classes
6 * Copyright (C) 2003-2009 Ushodaya Enterprises Limited
7 * \author Charles Yates <charles.yates@pandora.be>
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #include "mlt_properties.h"
28 #include "mlt_deque.h"
29 #include "mlt_service.h"
31 /** Callback function to get video data.
35 typedef int ( *mlt_get_image )( mlt_frame self, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable );
37 /** Callback function to get audio data.
41 typedef int ( *mlt_get_audio )( mlt_frame self, void **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples );
43 /** \brief Frame class
45 * The frame is the primary data object that gets passed around to and through services.
47 * \extends mlt_properties
48 * \properties \em test_image set if the frame holds a "test card" image
49 * \properties \em test_audio set if the frame holds "test card" audio
50 * \properties \em _producer holds a reference to the frame's end producer
51 * \properties \em _speed the current speed of the producer that generated the frame
52 * \properties \em _position the position of the frame
53 * \properties \em meta.* holds metadata
54 * \properties \em hide set to 1 to hide the video, 2 to mute the audio
55 * \properties \em last_track a flag to indicate an end-of-tracks frame
60 struct mlt_properties_s parent; /**< \private A frame extends properties. */
62 /** Get the alpha channel (callback function).
64 * \return the 8-bit alpha channel
66 uint8_t * ( *get_alpha_mask )( mlt_frame self );
68 /** Convert the image format (callback function).
70 * \param[in,out] image a buffer of image data
71 * \param[in,out] input the image format of supplied image data
72 * \param output the image format to which to convert
73 * \return true if error
75 int ( *convert_image )( mlt_frame self, uint8_t **image, mlt_image_format *input, mlt_image_format output );
77 /** Convert the audio format (callback function).
79 * \param[in,out] audio a buffer of audio data
80 * \param[in,out] input the audio format of supplied data
81 * \param output the audio format to which to convert
82 * \return true if error
84 int ( *convert_audio )( mlt_frame self, void **audio, mlt_audio_format *input, mlt_audio_format output );
86 mlt_deque stack_image; /**< \private the image processing stack of operations and data */
87 mlt_deque stack_audio; /**< \private the audio processing stack of operations and data */
88 mlt_deque stack_service; /**< \private a general purpose data stack */
91 #define MLT_FRAME_PROPERTIES( frame ) ( &( frame )->parent )
92 #define MLT_FRAME_SERVICE_STACK( frame ) ( ( frame )->stack_service )
93 #define MLT_FRAME_IMAGE_STACK( frame ) ( ( frame )->stack_image )
94 #define MLT_FRAME_AUDIO_STACK( frame ) ( ( frame )->stack_audio )
96 extern mlt_frame mlt_frame_init( mlt_service service );
97 extern mlt_properties mlt_frame_properties( mlt_frame self );
98 extern int mlt_frame_is_test_card( mlt_frame self );
99 extern int mlt_frame_is_test_audio( mlt_frame self );
100 extern double mlt_frame_get_aspect_ratio( mlt_frame self );
101 extern int mlt_frame_set_aspect_ratio( mlt_frame self, double value );
102 extern mlt_position mlt_frame_get_position( mlt_frame self );
103 extern int mlt_frame_set_position( mlt_frame self, mlt_position value );
104 extern void mlt_frame_replace_image( mlt_frame self, uint8_t *image, mlt_image_format format, int width, int height );
105 extern int mlt_frame_get_image( mlt_frame self, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable );
106 extern uint8_t *mlt_frame_get_alpha_mask( mlt_frame self );
107 extern int mlt_frame_get_audio( mlt_frame self, void **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples );
108 extern int mlt_frame_set_audio( mlt_frame self, void *buffer, mlt_audio_format, int size, mlt_destructor );
109 extern unsigned char *mlt_frame_get_waveform( mlt_frame self, int w, int h );
110 extern int mlt_frame_push_get_image( mlt_frame self, mlt_get_image get_image );
111 extern mlt_get_image mlt_frame_pop_get_image( mlt_frame self );
112 extern int mlt_frame_push_frame( mlt_frame self, mlt_frame that );
113 extern mlt_frame mlt_frame_pop_frame( mlt_frame self );
114 extern int mlt_frame_push_service( mlt_frame self, void *that );
115 extern void *mlt_frame_pop_service( mlt_frame self );
116 extern int mlt_frame_push_service_int( mlt_frame self, int that );
117 extern int mlt_frame_pop_service_int( mlt_frame self );
118 extern int mlt_frame_push_audio( mlt_frame self, void *that );
119 extern void *mlt_frame_pop_audio( mlt_frame self );
120 extern mlt_deque mlt_frame_service_stack( mlt_frame self );
121 extern mlt_producer mlt_frame_get_original_producer( mlt_frame self );
122 extern void mlt_frame_close( mlt_frame self );
124 /* convenience functions */
125 extern int mlt_sample_calculator( float fps, int frequency, int64_t position );
126 extern int64_t mlt_sample_calculator_to_now( float fps, int frequency, int64_t position );
127 extern const char * mlt_image_format_name( mlt_image_format format );
128 extern const char * mlt_audio_format_name( mlt_audio_format format );
130 /** This macro scales rgb into the yuv gamut - y is scaled by 219/255 and uv by 224/255. */
131 #define RGB2YUV(r, g, b, y, u, v)\
132 y = ((263*r + 516*g + 100*b) >> 10) + 16;\
133 u = ((-152*r - 298*g + 450*b) >> 10) + 128;\
134 v = ((450*r - 377*g - 73*b) >> 10) + 128;
136 /** This macro assumes the user has already scaled their rgb down into the broadcast limits. **/
137 #define RGB2YUV_UNSCALED(r, g, b, y, u, v)\
138 y = (299*r + 587*g + 114*b) >> 10;\
139 u = ((-169*r - 331*g + 500*b) >> 10) + 128;\
140 v = ((500*r - 419*g - 81*b) >> 10) + 128;\
141 y = y < 16 ? 16 : y;\
142 u = u < 16 ? 16 : u;\
143 v = v < 16 ? 16 : v;\
144 y = y > 235 ? 235 : y;\
145 u = u > 240 ? 240 : u;\
146 v = v > 240 ? 240 : v
148 /** This macro converts a YUV value to the RGB color space. */
149 #define YUV2RGB( y, u, v, r, g, b ) \
150 r = ((1192 * ( y - 16 ) + 1634 * ( v - 128 ) ) >> 10 ); \
151 g = ((1192 * ( y - 16 ) - 832 * ( v - 128 ) - 400 * ( u - 128 ) ) >> 10 ); \
152 b = ((1192 * ( y - 16 ) + 2066 * ( u - 128 ) ) >> 10 ); \
153 r = r < 0 ? 0 : r > 255 ? 255 : r; \
154 g = g < 0 ? 0 : g > 255 ? 255 : g; \
155 b = b < 0 ? 0 : b > 255 ? 255 : b;