vf_fps.c File Reference

a filter enforcing given constant framerate More...

#include "libavutil/common.h"
#include "libavutil/fifo.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"

Go to the source code of this file.

Data Structures
struct	FPSContext

Macros
#define	OFFSET(x)   offsetof(FPSContext, x)
#define	V   AV_OPT_FLAG_VIDEO_PARAM
#define	F   AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (fps)
static av_cold int	init (AVFilterContext *ctx, const char *args)
static void	flush_fifo (AVFifoBuffer *fifo)
static av_cold void	uninit (AVFilterContext *ctx)
static int	config_props (AVFilterLink *link)
static int	request_frame (AVFilterLink *outlink)
static int	write_to_fifo (AVFifoBuffer *fifo, AVFilterBufferRef *buf)
static int	filter_frame (AVFilterLink *inlink, AVFilterBufferRef *buf)

Variables
static const AVOption	fps_options []
static const AVFilterPad	avfilter_vf_fps_inputs []
static const AVFilterPad	avfilter_vf_fps_outputs []
AVFilter	avfilter_vf_fps

Detailed Description

a filter enforcing given constant framerate

Definition in file vf_fps.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(FPSContext, x)

Definition at line 58 of file vf_fps.c.

#define V   AV_OPT_FLAG_VIDEO_PARAM

Definition at line 59 of file vf_fps.c.

#define F   AV_OPT_FLAG_FILTERING_PARAM

Definition at line 60 of file vf_fps.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

fps

)

static av_cold int init ( AVFilterContext *  ctx, const char *  args  )

static

Definition at line 74 of file vf_fps.c.

static void flush_fifo ( AVFifoBuffer *  fifo )

static

Definition at line 99 of file vf_fps.c.

Referenced by filter_frame(), and uninit().

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 108 of file vf_fps.c.

static int config_props ( AVFilterLink *  link )

static

Definition at line 120 of file vf_fps.c.

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 133 of file vf_fps.c.

static int write_to_fifo ( AVFifoBuffer *  fifo, AVFilterBufferRef *  buf  )

static

Definition at line 164 of file vf_fps.c.

Referenced by filter_frame().

static int filter_frame ( AVFilterLink *  inlink, AVFilterBufferRef *  buf  )

static

Definition at line 178 of file vf_fps.c.

Variable Documentation

const AVOption fps_options[]

static

Initial value:

= {
    { "fps", "A string describing desired output framerate", OFFSET(fps), AV_OPT_TYPE_STRING, { .str = "25" }, .flags = V|F },
    { "round", "set rounding method for timestamps", OFFSET(rounding), AV_OPT_TYPE_INT, { .i64 = AV_ROUND_NEAR_INF }, 0, 5, V|F, "round" },
    { "zero", "round towards 0",      OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_ZERO     }, 0, 5, V|F, "round" },
    { "inf",  "round away from 0",    OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_INF      }, 0, 5, V|F, "round" },
    { "down", "round towards -infty", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_DOWN     }, 0, 5, V|F, "round" },
    { "up",   "round towards +infty", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_UP       }, 0, 5, V|F, "round" },
    { "near", "round to nearest",     OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_NEAR_INF }, 0, 5, V|F, "round" },
    { NULL },
}

Definition at line 61 of file vf_fps.c.

const AVFilterPad avfilter_vf_fps_inputs[]

static

Initial value:

= {
    {
        .name        = "default",
        .type        = AVMEDIA_TYPE_VIDEO,
        .min_perms   = AV_PERM_READ | AV_PERM_PRESERVE,
        .filter_frame = filter_frame,
    },
    { NULL }
}

Definition at line 271 of file vf_fps.c.

const AVFilterPad avfilter_vf_fps_outputs[]

static

Initial value:

= {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_VIDEO,
        .rej_perms     = AV_PERM_WRITE,
        .request_frame = request_frame,
        .config_props  = config_props
    },
    { NULL }
}

Definition at line 281 of file vf_fps.c.

AVFilter avfilter_vf_fps

Initial value:

= {
    .name        = "fps",
    .description = NULL_IF_CONFIG_SMALL("Force constant framerate"),

    .init      = init,
    .uninit    = uninit,

    .priv_size = sizeof(FPSContext),

    .inputs    = avfilter_vf_fps_inputs,
    .outputs   = avfilter_vf_fps_outputs,
    .priv_class = &fps_class,
}

Definition at line 292 of file vf_fps.c.