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 <[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.

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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