gavl: Timecodes

gavl

Data Structures | Macros | Typedefs | Functions
Timecodes

Timecode definitions. More...

## Data Structures
struct | gavl_timecode_format_t
| Timecode format. More...

## Macros
#define | GAVL_TIMECODE_SIGN_MASK (0x1LL<<62)
| If 1, timecode is negative.
#define | GAVL_TIMECODE_INVALID_MASK (0x1LL<<63)
| If 1, timecode is invalid.
#define | GAVL_TIMECODE_DROP_FRAME (1<<0)
| NTSC drop frame is used.
#define | GAVL_TIMECODE_UNDEFINED GAVL_TIMECODE_INVALID_MASK
| Convenience macro.
#define | GAVL_TIMECODE_STRING_LEN 26
#define | GAVL_TIMECODE_STRING_LEN_SHORT 13

## Typedefs
typedef uint64_t | gavl_timecode_t
| Typedef for timecodes.

## Functions
GAVL_PUBLIC void | gavl_timecode_format_copy (gavl_timecode_format_t *dst, const gavl_timecode_format_t *src)
| Copy one timecode format to another.
GAVL_PUBLIC void | gavl_timecode_to_hmsf (gavl_timecode_t tc, int *hours, int *minutes, int *seconds, int *frames)
| Extract the time part of the timecode.
GAVL_PUBLIC void | gavl_timecode_to_ymd (gavl_timecode_t tc, int *year, int *month, int *day)
| Extract the date part of the timecode.
GAVL_PUBLIC void | gavl_timecode_from_hmsf (gavl_timecode_t *tc, int hours, int minutes, int seconds, int frames)
| Set the time part of the timecode.
GAVL_PUBLIC void | gavl_timecode_from_ymd (gavl_timecode_t *tc, int year, int month, int day)
| Set the date part of the timecode.
GAVL_PUBLIC int64_t | gavl_timecode_to_framecount (const gavl_timecode_format_t *tf, gavl_timecode_t tc)
| Get the frame count from the timecode.
GAVL_PUBLIC gavl_timecode_t | gavl_timecode_from_framecount (const gavl_timecode_format_t *tf, int64_t fc)
| Get a timecode from the frame count.
GAVL_PUBLIC void | gavl_timecode_dump (const gavl_timecode_format_t *tf, gavl_timecode_t tc)
| Dump a timecode to stderr.
GAVL_PUBLIC void | gavl_timecode_prettyprint (const gavl_timecode_format_t *tf, gavl_timecode_t tc, char str[GAVL_TIMECODE_STRING_LEN])
| Print a full timecode into a string.
GAVL_PUBLIC void | gavl_timecode_prettyprint_short (gavl_timecode_t tc, char str[GAVL_TIMECODE_STRING_LEN_SHORT])
| Print a short timecode into a string.

## Detailed Description

Timecode definitions.

Timecodes are usually associated with video frames and represent a unique time (e.g. Wall clock time) within the whole footage.

Since 1.1.0

## Macro Definition Documentation

## ◆ GAVL_TIMECODE_SIGN_MASK

#define GAVL_TIMECODE_SIGN_MASK (0x1LL<<62)

If 1, timecode is negative.

## ◆ GAVL_TIMECODE_INVALID_MASK

#define GAVL_TIMECODE_INVALID_MASK (0x1LL<<63)

If 1, timecode is invalid.

## ◆ GAVL_TIMECODE_DROP_FRAME

#define GAVL_TIMECODE_DROP_FRAME (1<<0)

NTSC drop frame is used.

## ◆ GAVL_TIMECODE_UNDEFINED

#define GAVL_TIMECODE_UNDEFINED GAVL_TIMECODE_INVALID_MASK

Convenience macro.

## ◆ GAVL_TIMECODE_STRING_LEN

#define GAVL_TIMECODE_STRING_LEN 26

Length for a string into which a timecode will be printed

Referenced by gavl_timecode_prettyprint().

## ◆ GAVL_TIMECODE_STRING_LEN_SHORT

#define GAVL_TIMECODE_STRING_LEN_SHORT 13

Length for a string into which a short timecode will be printed

Referenced by gavl_timecode_prettyprint_short().

## Typedef Documentation

## ◆ gavl_timecode_t

typedef uint64_t gavl_timecode_t

Typedef for timecodes.

## Function Documentation

## ◆ gavl_timecode_format_copy()

GAVL_PUBLIC void gavl_timecode_format_copy | ( | gavl_timecode_format_t * | dst,
|  | const gavl_timecode_format_t * | src )

Copy one timecode format to another.

Parameters

  dst | Destination format
  src | Source format

## ◆ gavl_timecode_to_hmsf()

GAVL_PUBLIC void gavl_timecode_to_hmsf | ( | gavl_timecode_t | tc,
|  | int * | hours,
|  | int * | minutes,
|  | int * | seconds,
|  | int * | frames )

Extract the time part of the timecode.

Parameters

  tc | A timecode
  hours | If non NULL, returns the hours
  minutes | If non NULL, returns the minutes
  seconds | If non NULL, returns the seconds
  frames | If non NULL, returns the frames

## ◆ gavl_timecode_to_ymd()

GAVL_PUBLIC void gavl_timecode_to_ymd | ( | gavl_timecode_t | tc,
|  | int * | year,
|  | int * | month,
|  | int * | day )

Extract the date part of the timecode.

Parameters

  tc | A timecode
  year | If non NULL, returns the year
  month | If non NULL, returns the month
  day | If non NULL, returns the day

## ◆ gavl_timecode_from_hmsf()

GAVL_PUBLIC void gavl_timecode_from_hmsf | ( | gavl_timecode_t * | tc,
|  | int | hours,
|  | int | minutes,
|  | int | seconds,
|  | int | frames )

Set the time part of the timecode.

Parameters

  tc | A timecode
  hours | The hours
  minutes | The minutes
  seconds | The seconds
  frames | The frames

## ◆ gavl_timecode_from_ymd()

GAVL_PUBLIC void gavl_timecode_from_ymd | ( | gavl_timecode_t * | tc,
|  | int | year,
|  | int | month,
|  | int | day )

Set the date part of the timecode.

Parameters

  tc | A timecode
  year | The year
  month | The month
  day | The day

## ◆ gavl_timecode_to_framecount()

GAVL_PUBLIC int64_t gavl_timecode_to_framecount | ( | const gavl_timecode_format_t * | tf,
|  | gavl_timecode_t | tc )

Get the frame count from the timecode.

Parameters

  tf | The timecode format
  tc | A timecode

Returns
  The frame count

If the time is larger than 24 hours, the framecount is calculated from 00:00:00, January 1, 1970

## ◆ gavl_timecode_from_framecount()

GAVL_PUBLIC gavl_timecode_t gavl_timecode_from_framecount | ( | const gavl_timecode_format_t * | tf,
|  | int64_t | fc )

Get a timecode from the frame count.

Parameters

  tf | The timecode format
  fc | The frame count

Returns
  The timecode corresponding to the framecount

If the date fields are non-zero, the framecount is calculated from 00:00:00, January 1, 1970

## ◆ gavl_timecode_dump()

GAVL_PUBLIC void gavl_timecode_dump | ( | const gavl_timecode_format_t * | tf,
|  | gavl_timecode_t | tc )

Dump a timecode to stderr.

Parameters

  tf | The timecode format
  tc | A timecode

This is used mainly for debugging

## ◆ gavl_timecode_prettyprint()

GAVL_PUBLIC void gavl_timecode_prettyprint | ( | const gavl_timecode_format_t * | tf,
|  | gavl_timecode_t | tc,
|  | char | str[GAVL_TIMECODE_STRING_LEN] )

Print a full timecode into a string.

Parameters

  tf | The timecode format
  tc | A timecode
  str | String where the timecode will be printed

This prints the full timecode (including calendar date if available). For real-life applications, you might want to try gavl_timecode_prettyprint_short instead.

References GAVL_TIMECODE_STRING_LEN.

## ◆ gavl_timecode_prettyprint_short()

GAVL_PUBLIC void gavl_timecode_prettyprint_short | ( | gavl_timecode_t | tc,
|  | char | str[GAVL_TIMECODE_STRING_LEN_SHORT] )

Print a short timecode into a string.

Parameters

  tc | A timecode
  str | String where the timecode will be printed

Since 1.1.1

References GAVL_TIMECODE_STRING_LEN_SHORT.