Documentation for <libdisplay-info/cvt.h>
Table of contents
di_cvt_compute() ¶
void di_cvt_compute(struct di_cvt_timing *t, const struct di_cvt_options *options);
Compute a timing via the CVT formula.
struct di_cvt_options ¶
struct di_cvt_options { /* Version of the reduced blanking timing formula to be used */ enum di_cvt_reduced_blanking_version red_blank_ver; /* Desired active (visible) horizontal pixels and vertical lines per * frame */ int32_t h_pixels, v_lines; /* Target vertical refresh rate (in Hz) */ double ip_freq_rqd; /* Whether to generate a "video-optimized" timing variant (RBv2 only) */ bool video_opt; /* Desired VBlank time (in µs, RBv3 only, must be greater than 460) */ double vblank; /* Desired additional number of pixels to add to the base HBlank * duration (RBv3 only, must be a multiple of 8 between 0 and 120) */ int32_t additional_hblank; /* Indicates whether the VSync location is early (RBv3 only) */ bool early_vsync_rqd; /* Whether interlaced is required (no RB and RBv1 only) */ bool int_rqd; /* Whether margins are required (no RB and RBv1 only) */ bool margins_rqd; };
Input parameters, defined in table 3-1.
enum di_cvt_reduced_blanking_version ¶
enum di_cvt_reduced_blanking_version { DI_CVT_REDUCED_BLANKING_NONE, DI_CVT_REDUCED_BLANKING_V1, DI_CVT_REDUCED_BLANKING_V2, DI_CVT_REDUCED_BLANKING_V3, };
struct di_cvt_timing ¶
struct di_cvt_timing { /* Pixel clock frequency (in MHz) */ double act_pixel_freq; /* Total number of active (visible) pixels per line */ double total_active_pixels; /* Total number of active (visible) vertical lines per frame */ double v_lines_rnd; /* Number of pixels in the horizontal front porch period */ double h_front_porch; /* Number of pixels in the HSync period */ double h_sync; /* Number of pixels in the horizontal back porch period */ double h_back_porch; /* Number of lines in the vertical front porch period */ double v_front_porch; /* Number of lines in the VSync period */ double v_sync; /* Number of lines in the vertical back porch period */ double v_back_porch; /* Frame rate (in Hz) */ double act_frame_rate; };
Output parameters, defined in table 3-4.