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.

Generated on Fri Oct 26 02:46:10 2012 for FFmpeg by doxygen 1.5.8