table of contents
framerate.h(3) | libltcsmpte | framerate.h(3) |
NAME¶
framerate.h - libltcsmpte - framerate conversionSYNOPSIS¶
Data Structures¶
struct FrameRate
Enumerations¶
enum FRFlags { FRF_NONE = 0, FRF_DROP_FRAMES = 1, FRF_UNUSED = 2, FRF_SAMPLERATE = 4, FRF_OFFA = 8, FRF_OFFV = 16, FRF_LAST = 32 }
Functions¶
int FR_toint (FrameRate *fr)
Detailed Description¶
libltcsmpte - framerate conversion Author:Robin Gareus <robin@gareus.org>
Copyright (C) 2006, 2007, 2008 Robin Gareus <robin@gareus.org>
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU Lesser Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this library; if not, write to the Free Software Foundation, Inc., 51
Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Definition in file framerate.h.
Enumeration Type Documentation¶
enum FRFlags¶
Frame-Rate-Flags and options: multiple flags/options can be added (binary OR). Enumerator:- FRF_NONE
- FRF_DROP_FRAMES
- use drop frame timecode
- FRF_UNUSED
- FRF_SAMPLERATE
- has sample-rate info
- FRF_OFFA
- has audio frame offset
- FRF_OFFV
- has video frame offset
- FRF_LAST
enum FRSMPTE¶
Enumerator:- SMPTE_FRAME
- SMPTE_SEC
- SMPTE_MIN
- SMPTE_HOUR
- SMPTE_OVERFLOW
- SMPTE_LAST
Function Documentation¶
double FR_af2vf ( FrameRate * f, long long int af)¶
convert audio-frame to fractional video-frameslong int FR_af2vfi ( FrameRate * f, long long int af)¶
convert audio-frame to integer video-frames round down to the prev. video frame.long int FR_bcd2vf ( FrameRate * fr, int bcd[SMPTE_LAST])¶
wrapper around FR_smpte2vf reads SMPTE as bcd array argument and returns video frame number, starting at zeroFrameRate* FR_create (int num, int den, int flags)¶
allocate memory for FrameRate struct and initialize with given values. Examples:tests/decoder.c, and tests/encoder.c.
long int FR_drop_frames ( FrameRate * fr, int f, int s, int m, int h)¶
private function - no need to call it when using the FR-API for smpte/bcd conversion Drop frame numbers (not frames) 00:00 and 00:01 at the start of every minute except the tenth. returns video frame number staring at zero for 29.97fps dropframes are not required or permitted when operating at 24, 25, or 30 frames per second.void FR_frame_to_bcd ( FrameRate * f, long int * bcd, long int frame)¶
converts video-frame number into binary coded decimal timecode sets: bcd[SMPTE_FRAME] . . bcd[SMPTE_LAST] accoding to video-frame. Note: this supports only integer framerates! use FR_vf2smpte instead.void FR_free ( FrameRate * f)¶
free memory allocated for FrameRate data structure Examples:tests/decoder.c, and tests/encoder.c.
long int FR_insert_drop_frames (long int frames)¶
private function - no need to call it when using the FR-API for smpte/bcd conversion Insert two frame numbers at the start of every minute except the tenth. unit: video-frames!void FR_setdbl ( FrameRate * fr, double fps, int mode)¶
convert double value into ratio and set framerate. if mode == 1: autodetect drop-frame timecode (set flag|=FRF_DROP_FRAMES if fps==29.97 ) Examples:tests/decoder.c, and tests/encoder.c.
void FR_setflags ( FrameRate * fr, int flags)¶
directly change framerate flagsvoid FR_setratio ( FrameRate * fr, int num, int den)¶
set the frameratevoid FR_setsamplerate ( FrameRate * f, int samplerate)¶
set audio sample rate (sps) for av,vf conversionlong int FR_smpte2vf ( FrameRate * fr, int f, int s, int m, int h, int overflow)¶
convert smpte into video-frame number expects smpte in decimal representation as separate arguments: f: frame, s: second, m: minute, h: hour overflow should be set to zero (days); returns: video frame number, starting at zerodouble FR_todbl ( FrameRate * fr)¶
return (double) floating point representation of framerateint FR_toint ( FrameRate * fr)¶
round framerate to the nearest integerlong long int FR_vf2af ( FrameRate * f, long int vf)¶
convert integer video-frames to audio frame.void FR_vf2smpte ( FrameRate * fr, char * smptestring, long int frame)¶
converts video-frame into 13char SMPTE string. smptestring needs to point to a allocated (char*) memory! it does handle drop-frame formats correctly.Author¶
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