Timecode helpers. More...

#include <stdio.h>
#include "timecode.h"
#include "log.h"
#include "error.h"

Include dependency graph for libavutil/timecode.c:

Functions
int	av_timecode_adjust_ntsc_framenum2 (int framenum, int fps)
	Adjust frame number for NTSC drop frame time code. More...

uint32_t	av_timecode_get_smpte_from_framenum (const AVTimecode *tc, int framenum)
	Convert frame number to SMPTE 12M binary representation. More...

char *	av_timecode_make_string (const AVTimecode tc, char buf, int framenum)
	Load timecode string in buf. More...

static unsigned	bcd2uint (uint8_t bcd)

char *	av_timecode_make_smpte_tc_string (char *buf, uint32_t tcsmpte, int prevent_df)
	Get the timecode string from the SMPTE timecode format. More...

char *	av_timecode_make_mpeg_tc_string (char *buf, uint32_t tc25bit)
	Get the timecode string from the 25-bit timecode format (MPEG GOP format). More...

static int	check_fps (int fps)

static int	check_timecode (void log_ctx, AVTimecode tc)

static int	fps_from_frame_rate (AVRational rate)

int	av_timecode_check_frame_rate (AVRational rate)
	Check if the timecode feature is available for the given frame rate. More...

int	av_timecode_init (AVTimecode tc, AVRational rate, int flags, int frame_start, void log_ctx)
	Init a timecode struct with the passed parameters. More...

int	av_timecode_init_from_string (AVTimecode tc, AVRational rate, const char str, void *log_ctx)
	Parse timecode representation (hh:mm:ss[:;. More...

Detailed Description

Timecode helpers.

See also: https://en.wikipedia.org/wiki/SMPTE_time_code; http://www.dropframetimecode.org

Definition in file libavutil/timecode.c.

Function Documentation

int av_timecode_adjust_ntsc_framenum2	(	int	framenum,
		int	fps
	)

Adjust frame number for NTSC drop frame time code.

Parameters

framenum	frame number to adjust
fps	frame per second, 30 or 60

Returns: adjusted frame number

Warning: adjustment is only valid in NTSC 29.97 and 59.94

Definition at line 34 of file libavutil/timecode.c.

Referenced by av_timecode_get_smpte_from_framenum(), av_timecode_make_string(), and mpeg1_encode_sequence_header().

int av_timecode_check_frame_rate ( AVRational rate )

Check if the timecode feature is available for the given frame rate.

Returns: 0 if supported, <0 otherwise

Definition at line 177 of file libavutil/timecode.c.

Referenced by mov_create_timecode_track().

uint32_t av_timecode_get_smpte_from_framenum	(	const AVTimecode *	tc,
		int	framenum
	)

Convert frame number to SMPTE 12M binary representation.

Parameters

tc	timecode data correctly initialized
framenum	frame number

Returns: the SMPTE binary representation

Note: Frame number adjustment is automatically done in case of drop timecode, you do NOT have to call av_timecode_adjust_ntsc_framenum2().; The frame number is relative to tc->start.; Color frame (CF), binary group flags (BGF) and biphase mark polarity correction (PC) bits are set to zero.

Definition at line 55 of file libavutil/timecode.c.

Referenced by dv_write_pack(), and mxf_write_system_item().

int av_timecode_init	(	AVTimecode *	tc,
		AVRational	rate,
		int	flags,
		int	frame_start,
		void *	log_ctx
	)

Init a timecode struct with the passed parameters.

Parameters

log_ctx	a pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct (used for av_log)
tc	pointer to an allocated AVTimecode
rate	frame rate in rational form
flags	miscellaneous flags such as drop frame, +24 hours, ... (see AVTimecodeFlag)
frame_start	the first frame number

Returns: 0 on success, AVERROR otherwise

Definition at line 182 of file libavutil/timecode.c.

Referenced by dv_write_header(), mxf_parse_structural_metadata(), mxf_write_header(), and parse_timecode_in_framenum_format().

int av_timecode_init_from_string	(	AVTimecode *	tc,
		AVRational	rate,
		const char *	str,
		void *	log_ctx
	)

Parse timecode representation (hh:mm:ss[:;.

]ff).

Parameters

log_ctx	a pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct (used for av_log).
tc	pointer to an allocated AVTimecode
rate	frame rate in rational form
str	timecode string which will determine the frame start

Returns: 0 on success, AVERROR otherwise

Definition at line 192 of file libavutil/timecode.c.

Referenced by dv_write_header(), encode_init(), init(), mov_create_timecode_track(), and mxf_write_header().

char* av_timecode_make_mpeg_tc_string	(	char *	buf,
		uint32_t	tc25bit
	)

Get the timecode string from the 25-bit timecode format (MPEG GOP format).

Parameters

buf	destination buffer, must be at least AV_TIMECODE_STR_SIZE long
tc25bit	the 25-bits timecode

Returns: the buf parameter

Definition at line 130 of file libavutil/timecode.c.

Referenced by mpeg_decode_gop(), and show_stream().

char* av_timecode_make_smpte_tc_string	(	char *	buf,
		uint32_t	tcsmpte,
		int	prevent_df
	)

Get the timecode string from the SMPTE timecode format.

Parameters

buf	destination buffer, must be at least AV_TIMECODE_STR_SIZE long
tcsmpte	the 32-bit SMPTE timecode
prevent_df	prevent the use of a drop flag when it is known the DF bit is arbitrary

Returns: the buf parameter

Definition at line 118 of file libavutil/timecode.c.

Referenced by dv_extract_timecode().

char* av_timecode_make_string	(	const AVTimecode *	tc,
		char *	buf,
		int	framenum
	)

Load timecode string in buf.

Parameters

buf	destination buffer, must be at least AV_TIMECODE_STR_SIZE long
tc	timecode data correctly initialized
framenum	frame number

Returns: the buf parameter

Note: Timecode representation can be a negative timecode and have more than 24 hours, but will only be honored if the flags are correctly set.; The frame number is relative to tc->start.

Definition at line 84 of file libavutil/timecode.c.

Referenced by draw_text(), mxf_add_timecode_metadata(), and parse_timecode_in_framenum_format().

static unsigned bcd2uint ( uint8_t bcd )

static

Definition at line 109 of file libavutil/timecode.c.

Referenced by av_timecode_make_smpte_tc_string().

static int check_fps ( int fps )

static

Definition at line 141 of file libavutil/timecode.c.

Referenced by av_timecode_check_frame_rate(), and check_timecode().