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

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...

uint32_t	av_timecode_get_smpte (AVRational rate, int drop, int hh, int mm, int ss, int ff)
	Convert sei info 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_string2 (char *buf, AVRational rate, uint32_t tcsmpte, int prevent_df, int skip_field)
	Get the timecode string from the SMPTE timecode format. More...

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_components (AVTimecode tc, AVRational rate, int flags, int hh, int mm, int ss, int ff, void log_ctx)
	Init a timecode struct from the passed timecode components. 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 timecode.c.

Function Documentation

◆ av_timecode_adjust_ntsc_framenum2()

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, multiples of 30

Returns: adjusted frame number

Warning: adjustment is only valid for multiples of NTSC 29.97

Definition at line 34 of file timecode.c.

Referenced by av_timecode_get_smpte_from_framenum(), and av_timecode_make_string().

◆ av_timecode_get_smpte_from_framenum()

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

See SMPTE ST 314M-2005 Sec 4.4.2.2.1 "Time code pack (TC)" the format description as follows: bits 0-5: hours, in BCD(6bits) bits 6: BGF1 bits 7: BGF2 (NTSC) or FIELD (PAL) bits 8-14: minutes, in BCD(7bits) bits 15: BGF0 (NTSC) or BGF2 (PAL) bits 16-22: seconds, in BCD(7bits) bits 23: FIELD (NTSC) or BGF0 (PAL) bits 24-29: frames, in BCD(6bits) bits 30: drop frame flag (0: non drop, 1: drop) bits 31: color frame flag (0: unsync mode, 1: sync mode)

Note: BCD numbers (6 or 7 bits): 4 or 5 lower bits for units, 2 higher bits for tens.; 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) and binary group flags (BGF) bits are set to zero.

Definition at line 52 of file timecode.c.

Referenced by dv_write_pack(), mxf_write_system_item(), and decklink_input_callback::VideoInputFrameArrived().

◆ av_timecode_get_smpte()

uint32_t av_timecode_get_smpte	(	AVRational	rate,
		int	drop,
		int	hh,
		int	mm,
		int	ss,
		int	ff
	)

Convert sei info to SMPTE 12M binary representation.

Parameters

rate	frame rate in rational form
drop	drop flag
hh	hour
mm	minute
ss	second
ff	frame number

Returns: the SMPTE binary representation

Definition at line 68 of file timecode.c.

Referenced by av_timecode_get_smpte_from_framenum(), h264_export_frame_props(), and set_side_data().

◆ av_timecode_make_string()

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 102 of file timecode.c.

Referenced by draw_text(), mxf_add_timecode_metadata(), parse_timecode_in_framenum_format(), segment_end(), and decklink_input_callback::VideoInputFrameArrived().

◆ bcd2uint()

static unsigned bcd2uint ( uint8_t bcd )

static

Definition at line 127 of file timecode.c.

Referenced by av_timecode_make_smpte_tc_string2().

◆ av_timecode_make_smpte_tc_string2()

char* av_timecode_make_smpte_tc_string2	(	char *	buf,
		AVRational	rate,
		uint32_t	tcsmpte,
		int	prevent_df,
		int	skip_field
	)

Get the timecode string from the SMPTE timecode format.

In contrast to av_timecode_make_smpte_tc_string this function supports 50/60 fps timecodes by using the field bit.

Parameters

buf	destination buffer, must be at least AV_TIMECODE_STR_SIZE long
rate	frame rate of the timecode
tcsmpte	the 32-bit SMPTE timecode
prevent_df	prevent the use of a drop flag when it is known the DF bit is arbitrary
skip_field	prevent the use of a field flag when it is known the field bit is arbitrary (e.g. because it is used as PC flag)

Returns: the buf parameter

Definition at line 136 of file timecode.c.

Referenced by av_timecode_make_smpte_tc_string(), decode_frame(), dump_s12m_timecode(), dv_extract_timecode(), h264_export_frame_props(), set_side_data(), show_frame(), and wsd_read_header().

◆ av_timecode_make_smpte_tc_string()

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 160 of file timecode.c.

◆ av_timecode_make_mpeg_tc_string()

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 165 of file timecode.c.

Referenced by filter_frame(), mpeg_decode_frame(), mpeg_decode_gop(), and show_frame().

◆ check_fps()

static int check_fps ( int fps )

static

Definition at line 177 of file timecode.c.

Referenced by av_timecode_check_frame_rate(), and check_timecode().

◆ check_timecode()

static int check_timecode	(	void *	log_ctx,
		AVTimecode *	tc
	)

static

Definition at line 190 of file timecode.c.

Referenced by av_timecode_init(), and av_timecode_init_from_components().

◆ fps_from_frame_rate()

static int fps_from_frame_rate ( AVRational rate )

static

Definition at line 207 of file timecode.c.

Referenced by av_timecode_check_frame_rate(), av_timecode_init(), and av_timecode_init_from_components().

◆ av_timecode_check_frame_rate()

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 214 of file timecode.c.

◆ av_timecode_init()

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 219 of file timecode.c.

Referenced by dv_write_header(), mxf_init_timecode(), mxf_parse_physical_source_package(), mxf_parse_structural_metadata(), and parse_timecode_in_framenum_format().

◆ av_timecode_init_from_components()

int av_timecode_init_from_components	(	AVTimecode *	tc,
		AVRational	rate,
		int	flags,
		int	hh,
		int	mm,
		int	ss,
		int	ff,
		void *	log_ctx
	)

Init a timecode struct from the passed timecode components.

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)
hh	hours
mm	minutes
ss	seconds
ff	frames

Returns: 0 on success, AVERROR otherwise

Definition at line 229 of file timecode.c.

Referenced by av_timecode_init_from_string(), and get_bmd_timecode().

◆ av_timecode_init_from_string()

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 250 of file timecode.c.

Referenced by dv_write_header(), init(), mov_check_timecode_track(), mxf_init_timecode(), and segment_end().

Functions

Detailed Description

Function Documentation

◆ av_timecode_adjust_ntsc_framenum2()

◆ av_timecode_get_smpte_from_framenum()

◆ av_timecode_get_smpte()

◆ av_timecode_make_string()

◆ bcd2uint()

◆ av_timecode_make_smpte_tc_string2()

◆ av_timecode_make_smpte_tc_string()

◆ av_timecode_make_mpeg_tc_string()

◆ check_fps()

◆ check_timecode()

◆ fps_from_frame_rate()

◆ av_timecode_check_frame_rate()

◆ av_timecode_init()

◆ av_timecode_init_from_components()

◆ av_timecode_init_from_string()