Provided by: libltcsmpte-doc_0.4.4-1_all 
NAME
framerate.h -
libltcsmpte - framerate conversion
SYNOPSIS
Data Structures
struct FrameRate
Frame rate data structure.
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 }
Frame-Rate-Flags and options: multiple flags/options can be added (binary OR).
enum FRSMPTE { SMPTE_FRAME = 0, SMPTE_SEC, SMPTE_MIN, SMPTE_HOUR, SMPTE_OVERFLOW,
SMPTE_LAST }
Functions
int FR_toint (FrameRate *fr)
round framerate to the nearest integer
double FR_todbl (FrameRate *fr)
return (double) floating point representation of framerate
FrameRate * FR_create (int num, int den, int flags)
allocate memory for FrameRate struct and initialize with given values.
void FR_free (FrameRate *f)
free memory allocated for FrameRate data structure
void FR_setsamplerate (FrameRate *f, int samplerate)
set audio sample rate (sps) for av,vf conversion
long long int FR_vf2af (FrameRate *f, long int vf)
convert integer video-frames to audio frame.
long int FR_af2vfi (FrameRate *f, long long int af)
convert audio-frame to integer video-frames round down to the prev.
double FR_af2vf (FrameRate *f, long long int af)
convert audio-frame to fractional video-frames
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
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
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]
.
void FR_vf2smpte (FrameRate *fr, char *smptestring, long int frame)
converts video-frame into 13char SMPTE string.
long 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:
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 zero
void FR_setflags (FrameRate *fr, int flags)
directly change framerate flags
void FR_setratio (FrameRate *fr, int num, int den)
set the framerate
void FR_setdbl (FrameRate *fr, double fps, int mode)
convert double value into ratio and set framerate.
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
Definition at line 31 of file framerate.h.
enum FRSMPTE
Enumerator:
SMPTE_FRAME
SMPTE_SEC
SMPTE_MIN
SMPTE_HOUR
SMPTE_OVERFLOW
SMPTE_LAST
Definition at line 42 of file framerate.h.
Function Documentation
double FR_af2vf (FrameRate * f, long long int af)
convert audio-frame to fractional video-frames
long 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 zero
FrameRate* 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 flags
void FR_setratio (FrameRate * fr, int num, int den)
set the framerate
void FR_setsamplerate (FrameRate * f, int samplerate)
set audio sample rate (sps) for av,vf conversion
long 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 zero
double FR_todbl (FrameRate * fr)
return (double) floating point representation of framerate
int FR_toint (FrameRate * fr)
round framerate to the nearest integer
long 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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