libavcodec/timecode.c File Reference

Timecode helpers. More...

#include <stdio.h>
#include "timecode.h"
#include "libavutil/log.h"

Go to the source code of this file.

Functions
int	avpriv_framenum_to_drop_timecode (int frame_num)
	Adjust frame number for NTSC drop frame time code.
uint32_t	avpriv_framenum_to_smpte_timecode (unsigned frame, int fps, int drop)
	Convert frame id (timecode) to SMPTE 12M binary representation.
int	avpriv_check_timecode_rate (void *avcl, AVRational rate, int drop)
	Check if timecode rate is valid and consistent with the drop flag.
char *	avpriv_timecode_to_string (char *buf, const struct ff_timecode *tc, unsigned frame)
	Load timecode string in buf.
int	avpriv_init_smpte_timecode (void *avcl, struct ff_timecode *tc)
	Parse SMTPE 12M time representation (hh:mm:ss[:;.
int	ff_framenum_to_drop_timecode (int frame_num)
uint32_t	ff_framenum_to_smtpe_timecode (unsigned frame, int fps, int drop)
int	ff_init_smtpe_timecode (void *avcl, struct ff_timecode *tc)

---

Detailed Description

Timecode helpers.

Definition in file timecode.c.

---

Function Documentation

int avpriv_check_timecode_rate	(	void *	avcl,
		AVRational	rate,
		int	drop
	)

Check if timecode rate is valid and consistent with the drop flag.

Returns:

0 on success, negative value on failure

Definition at line 58 of file timecode.c.

Referenced by avpriv_init_smpte_timecode(), and parse_timecode_in_framenum_format().

int avpriv_framenum_to_drop_timecode

(

int

frame_num

)

Adjust frame number for NTSC drop frame time code.

Parameters:

frame_num

Actual frame number to adjust

Returns:

Adjusted frame number

Warning:

Adjustment is only valid in NTSC 29.97

Definition at line 31 of file timecode.c.

Referenced by avpriv_timecode_to_string(), dv_write_pack(), ff_framenum_to_drop_timecode(), mpeg1_encode_sequence_header(), and mxf_write_system_item().

uint32_t avpriv_framenum_to_smpte_timecode	(	unsigned	frame,
		int	fps,
		int	drop
	)

Convert frame id (timecode) to SMPTE 12M binary representation.

Parameters:

	frame	Frame number
	fps	Frame rate
	drop	Drop flag

Returns:

The actual binary representation

Definition at line 40 of file timecode.c.

Referenced by dv_write_pack(), ff_framenum_to_smtpe_timecode(), and mxf_write_system_item().

int avpriv_init_smpte_timecode	(	void *	avcl,
		struct ff_timecode *	tc
	)

Parse SMTPE 12M time representation (hh:mm:ss[:;.

]ff). str and rate fields from tc struct must be set.

Parameters:

	avcl	A pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct (used for av_log).
	tc	Timecode struct pointer

Returns:

0 on success, negative value on failure

Warning:

Adjustement is only valid in NTSC 29.97

Definition at line 104 of file timecode.c.

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

char* avpriv_timecode_to_string	(	char *	buf,
		const struct ff_timecode *	tc,
		unsigned	frame
	)

Load timecode string in buf.

Parameters:

	buf	Destination buffer
	tc	Timecode struct pointer
	frame	Frame id (timecode frame is computed with tc->start+frame)

Returns:

a pointer to the buf parameter

Note:

timecode representation can be a negative timecode and have more than 24 hours.

buf must have enough space to store the timecode representation: 16 bytes is the minimum required size.

Definition at line 82 of file timecode.c.

Referenced by draw_text(), and parse_timecode_in_framenum_format().

int ff_framenum_to_drop_timecode

(

int

frame_num

)

Definition at line 132 of file timecode.c.

uint32_t ff_framenum_to_smtpe_timecode	(	unsigned	frame,
		int	fps,
		int	drop
	)

Definition at line 137 of file timecode.c.

int ff_init_smtpe_timecode	(	void *	avcl,
		struct ff_timecode *	tc
	)

Definition at line 142 of file timecode.c.