1 #ifndef __LIVE_VIEW_H 2 #define __LIVE_VIEW_H 3 4 // Note: used in modules and platform independent code. 5 // Do not add platform dependent stuff in here (#ifdef/#endif compile options or camera dependent values) 6 7 /* 8 Protocol notes: 9 - Unless otherwise specified, all structure values are packed in camera native (little 10 endian) byte order 11 - Frame buffer and palette data are in native camera formats 12 Some documentation may be found at http://chdk.wikia.com/wiki/Frame_buffers 13 - The frame buffer descriptions returned may not be correct depending on the 14 camera model and various camera settings (shooting mode, digital zoom, aspect ratio) 15 This may result in partial images, garbage in the "valid" area or incorrect position 16 - In some cases, the requested data may not be available. If this happens, the framebuffer 17 or palette data offset will be zero. 18 - The frame buffer descriptions are returned regardless of whether the data is available 19 - New enum values (e.g. aspect ratio, framebuffer type, palette type) may be added in minor 20 versions. 21 */ 22 // Live View protocol version 23 #define LIVE_VIEW_VERSION_MAJOR 2 // increase only with backwards incompatible changes (and reset minor) 24 #define LIVE_VIEW_VERSION_MINOR 2 // increase with extensions of functionality 25 26 /* 27 protocol version history 28 < 2.0 - development versions 29 2.0 - initial release, chdk 1.1 30 2.1 - added palette type 4 - 16 entry VUYA, 2 bit alpha 31 2.2 - digic 6-7 support. Added LV_ASPECT_3_2, LV_FB_YUV8B and LV_FB_YUV8C formats 32 */ 33 34 35 // Control flags for determining which data block(s) to transfer 36 #define LV_TFR_VIEWPORT 0x01 37 #define LV_TFR_BITMAP 0x04 38 #define LV_TFR_PALETTE 0x08 39 #define LV_TFR_BITMAP_OPACITY 0x10 40 41 // physical aspect ratio constants. 42 enum lv_aspect_rato { 43 LV_ASPECT_4_3, 44 LV_ASPECT_16_9, 45 // below added in 2.2 46 LV_ASPECT_3_2, 47 }; 48 49 /* 50 Framebuffer types 51 additional values will be added if new data formats appear 52 */ 53 enum lv_fb_type { 54 LV_FB_YUV8, // 8 bit per element UYVYYY, used for live view 55 LV_FB_PAL8, // 8 bit paletted, used for bitmap overlay. Note palette data and type sent separately 56 // below added in 2.2 57 LV_FB_YUV8B,// 8 bit per element UYVY, used for live view and overlay on Digic 6 58 LV_FB_YUV8C,// 8 bit per element UYVY, used for alternate Digic 6 live view 59 LV_FB_OPACITY8,// 8 bit opacity / alpha buffer 60 }; 61 62 /* 63 framebuffer data description 64 NOTE YUV pixels widths are based on the number of Y elements 65 */ 66 typedef struct { 67 int fb_type; // framebuffer type - note future versions might use different structures depending on type 68 int data_start; // offset of data from start of live view header 69 /* 70 buffer width in pixels 71 data size is always buffer_width*visible_height*(buffer bpp based on type) 72 */ 73 int buffer_width; 74 /* 75 visible size in pixels 76 describes data within the buffer which contains image data to be displayed 77 any offsets within buffer data are added before sending, so the top left 78 pixel is always the first first byte of data. 79 width must always be <= buffer_width 80 if buffer_width is > width, the additional data should be skipped 81 visible_height also defines the number of data rows 82 */ 83 int visible_width; 84 int visible_height; 85 86 /* 87 margins 88 pixels offsets needed to replicate display position on cameras screen 89 not used for any buffer offsets 90 */ 91 int margin_left; 92 int margin_top; 93 94 int margin_right; 95 int margin_bot; 96 } lv_framebuffer_desc; 97 98 typedef struct { 99 // live view sub-protocol version 100 int version_major; 101 int version_minor; 102 int lcd_aspect_ratio; // physical aspect ratio of LCD 103 int palette_type; 104 int palette_data_start; 105 // framebuffer descriptions are given as offsets, to allow expanding the structures in minor protocol changes 106 int vp_desc_start; 107 int bm_desc_start; 108 int bmo_desc_start; // added in protocol 2.2 109 } lv_data_header; 110 111 #endif // __LIVE_VIEW_H