Libltcsmpte - framerate conversion
struct FrameRate
Frame rate data structure.
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 }
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.
libltcsmpte - framerate conversion
Author:
Robin Gareus <[email protected]>
Copyright (C) 2006, 2007, 2008 Robin Gareus <[email protected]>
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.
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.
Enumerator:
SMPTE_FRAME
SMPTE_SEC
SMPTE_MIN
SMPTE_HOUR
SMPTE_OVERFLOW
SMPTE_LAST
Definition at line 42 of file framerate.h.
convert audio-frame to fractional video-frames
convert audio-frame to integer video-frames round down to the prev. video frame.
wrapper around FR_smpte2vf reads SMPTE as bcd array argument and returns video frame number, starting at zero
allocate memory for FrameRate struct and initialize with given values.
Examples: tests/decoder.c, and tests/encoder.c.
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.
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.
free memory allocated for FrameRate data structure
Examples: tests/decoder.c, and tests/encoder.c.
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!
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.
directly change framerate flags
set the framerate
set audio sample rate (sps) for av,vf conversion
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
return (double) floating point representation of framerate
round framerate to the nearest integer
convert integer video-frames to audio frame.
converts video-frame into 13char SMPTE string. smptestring needs to point to a allocated (char*) memory!
it does handle drop-frame formats correctly.
Generated automatically by Doxygen for libltcsmpte from the source code.