Libav
Data Structures | Macros | Enumerations | Functions | Variables
vf_overlay.c File Reference

overlay one video on top of another More...

#include "avfilter.h"
#include "formats.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/avstring.h"
#include "libavutil/avassert.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "internal.h"
#include "video.h"

Go to the source code of this file.

Data Structures

struct  OverlayContext

Macros

#define MAIN   0
#define OVERLAY   1
#define OFFSET(x)   offsetof(OverlayContext, x)
#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM

Enumerations

enum  var_name {
  VAR_E, VAR_INTERLACED, VAR_N, VAR_PHI,
  VAR_PI, VAR_PREV_INPTS, VAR_PREV_OUTPTS, VAR_PTS,
  VAR_STARTPTS, VAR_TB, VAR_RTCTIME, VAR_RTCSTART,
  VAR_S, VAR_SR, VAR_VARS_NB, VAR_PI,
  VAR_PHI, VAR_E, VAR_W, VAR_H,
  VAR_A, VAR_DAR, VAR_SAR, VAR_HSUB,
  VAR_VSUB, VARS_NB, VAR_W, VAR_H,
  VAR_CW, VAR_CH, VAR_HSUB, VAR_VSUB,
  VARS_NB, VAR_E, VAR_PHI, VAR_PI,
  VAR_IN_W, VAR_IW, VAR_IN_H, VAR_IH,
  VAR_OUT_W, VAR_OW, VAR_OUT_H, VAR_OH,
  VAR_X, VAR_Y, VAR_N, VAR_T,
  VAR_VARS_NB, VAR_E, VAR_PHI, VAR_PI,
  VAR_MAIN_W, VAR_MW, VAR_MAIN_H, VAR_MH,
  VAR_TEXT_W, VAR_TW, VAR_TEXT_H, VAR_TH,
  VAR_X, VAR_Y, VAR_N, VAR_T,
  VAR_VARS_NB, VAR_E, VAR_PHI, VAR_PI,
  VAR_W, VAR_H, VAR_VAL, VAR_MAXVAL,
  VAR_MINVAL, VAR_NEGVAL, VAR_CLIPVAL, VAR_VARS_NB,
  VAR_E, VAR_PHI, VAR_PI, VAR_MAIN_W,
  VAR_MW, VAR_MAIN_H, VAR_MH, VAR_OVERLAY_W,
  VAR_OW, VAR_OVERLAY_H, VAR_OH, VAR_VARS_NB,
  VAR_PI, VAR_PHI, VAR_E, VAR_IN_W,
  VAR_IW, VAR_IN_H, VAR_IH, VAR_OUT_W,
  VAR_OW, VAR_OUT_H, VAR_OH, VAR_X,
  VAR_Y, VAR_A, VAR_HSUB, VAR_VSUB,
  VARS_NB, VAR_PI, VAR_PHI, VAR_E,
  VAR_IN_W, VAR_IW, VAR_IN_H, VAR_IH,
  VAR_OUT_W, VAR_OW, VAR_OUT_H, VAR_OH,
  VAR_A, VAR_DAR, VAR_SAR, VAR_HSUB,
  VAR_VSUB, VARS_NB, VAR_E, VAR_PHI,
  VAR_PI, VAR_TB, VAR_PTS, VAR_START_PTS,
  VAR_PREV_PTS, VAR_PREV_SELECTED_PTS, VAR_T, VAR_START_T,
  VAR_PREV_T, VAR_PREV_SELECTED_T, VAR_PICT_TYPE, VAR_PICT_TYPE_I,
  VAR_PICT_TYPE_P, VAR_PICT_TYPE_B, VAR_PICT_TYPE_S, VAR_PICT_TYPE_SI,
  VAR_PICT_TYPE_SP, VAR_PICT_TYPE_BI, VAR_INTERLACE_TYPE, VAR_INTERLACE_TYPE_P,
  VAR_INTERLACE_TYPE_T, VAR_INTERLACE_TYPE_B, VAR_N, VAR_SELECTED_N,
  VAR_PREV_SELECTED_N, VAR_KEY, VAR_VARS_NB, VAR_E,
  VAR_PHI, VAR_PI, VAR_AVTB, VAR_INTB,
  VAR_VARS_NB, VAR_E, VAR_PHI, VAR_PI,
  VAR_AVTB, VAR_VARS_NB
}
enum  EOFAction { EOF_ACTION_REPEAT, EOF_ACTION_ENDALL, EOF_ACTION_PASS }

Functions

static av_cold void uninit (AVFilterContext *ctx)
static int query_formats (AVFilterContext *ctx)
static int config_input_main (AVFilterLink *inlink)
static int config_input_overlay (AVFilterLink *inlink)
static int config_output (AVFilterLink *outlink)
static void blend_frame (AVFilterContext *ctx, AVFrame *dst, AVFrame *src, int x, int y)
static int filter_frame_main (AVFilterLink *inlink, AVFrame *frame)
static int filter_frame_overlay (AVFilterLink *inlink, AVFrame *frame)
static int output_frame (AVFilterContext *ctx)
static int handle_overlay_eof (AVFilterContext *ctx)
static int request_frame (AVFilterLink *outlink)

Variables

static const char *const var_names []
static const char * eof_action_str []
static const AVOption options []
static const AVClass overlay_class
static const AVFilterPad avfilter_vf_overlay_inputs []
static const AVFilterPad avfilter_vf_overlay_outputs []
AVFilter ff_vf_overlay

Detailed Description

overlay one video on top of another

Definition in file vf_overlay.c.

Macro Definition Documentation

#define MAIN   0
#define OVERLAY   1
#define OFFSET (   x)    offsetof(OverlayContext, x)

Definition at line 366 of file vf_overlay.c.

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM

Definition at line 367 of file vf_overlay.c.

Enumeration Type Documentation

enum var_name
Enumerator:
VAR_E 
VAR_INTERLACED 
VAR_N 
VAR_PHI 
VAR_PI 
VAR_PREV_INPTS 
VAR_PREV_OUTPTS 
VAR_PTS 
VAR_STARTPTS 
VAR_TB 
VAR_RTCTIME 
VAR_RTCSTART 
VAR_S 
VAR_SR 
VAR_VARS_NB 
VAR_PI 
VAR_PHI 
VAR_E 
VAR_W 
VAR_H 
VAR_A 
VAR_DAR 
VAR_SAR 
VAR_HSUB 
VAR_VSUB 
VARS_NB 
VAR_W 
VAR_H 
VAR_CW 
VAR_CH 
VAR_HSUB 
VAR_VSUB 
VARS_NB 
VAR_E 
VAR_PHI 
VAR_PI 
VAR_IN_W 
VAR_IW 
VAR_IN_H 
VAR_IH 
VAR_OUT_W 
VAR_OW 
VAR_OUT_H 
VAR_OH 
VAR_X 
VAR_Y 
VAR_N 
VAR_T 
VAR_VARS_NB 
VAR_E 
VAR_PHI 
VAR_PI 
VAR_MAIN_W 
VAR_MW 
VAR_MAIN_H 
VAR_MH 
VAR_TEXT_W 
VAR_TW 
VAR_TEXT_H 
VAR_TH 
VAR_X 
VAR_Y 
VAR_N 
VAR_T 
VAR_VARS_NB 
VAR_E 
VAR_PHI 
VAR_PI 
VAR_W 
VAR_H 
VAR_VAL 
VAR_MAXVAL 
VAR_MINVAL 
VAR_NEGVAL 
VAR_CLIPVAL 
VAR_VARS_NB 
VAR_E 
VAR_PHI 
VAR_PI 
VAR_MAIN_W 
VAR_MW 
VAR_MAIN_H 
VAR_MH 
VAR_OVERLAY_W 
VAR_OW 
VAR_OVERLAY_H 
VAR_OH 
VAR_VARS_NB 
VAR_PI 
VAR_PHI 
VAR_E 
VAR_IN_W 
VAR_IW 
VAR_IN_H 
VAR_IH 
VAR_OUT_W 
VAR_OW 
VAR_OUT_H 
VAR_OH 
VAR_X 
VAR_Y 
VAR_A 
VAR_HSUB 
VAR_VSUB 
VARS_NB 
VAR_PI 
VAR_PHI 
VAR_E 
VAR_IN_W 
VAR_IW 
VAR_IN_H 
VAR_IH 
VAR_OUT_W 
VAR_OW 
VAR_OUT_H 
VAR_OH 
VAR_A 
VAR_DAR 
VAR_SAR 
VAR_HSUB 
VAR_VSUB 
VARS_NB 
VAR_E 
VAR_PHI 
VAR_PI 
VAR_TB 
VAR_PTS 
VAR_START_PTS 
VAR_PREV_PTS 
VAR_PREV_SELECTED_PTS 
VAR_T 
VAR_START_T 
VAR_PREV_T 
VAR_PREV_SELECTED_T 
VAR_PICT_TYPE 
VAR_PICT_TYPE_I 
VAR_PICT_TYPE_P 
VAR_PICT_TYPE_B 
VAR_PICT_TYPE_S 
VAR_PICT_TYPE_SI 
VAR_PICT_TYPE_SP 
VAR_PICT_TYPE_BI 
VAR_INTERLACE_TYPE 
VAR_INTERLACE_TYPE_P 
VAR_INTERLACE_TYPE_T 
VAR_INTERLACE_TYPE_B 
VAR_N 
VAR_SELECTED_N 
VAR_PREV_SELECTED_N 
VAR_KEY 
VAR_VARS_NB 
VAR_E 
VAR_PHI 
VAR_PI 
VAR_AVTB 
VAR_INTB 
VAR_VARS_NB 
VAR_E 
VAR_PHI 
VAR_PI 
VAR_AVTB 
VAR_VARS_NB 

Definition at line 52 of file vf_overlay.c.

enum EOFAction
Enumerator:
EOF_ACTION_REPEAT 
EOF_ACTION_ENDALL 
EOF_ACTION_PASS 

Definition at line 63 of file vf_overlay.c.

Function Documentation

static av_cold void uninit ( AVFilterContext ctx)
static

Definition at line 91 of file vf_overlay.c.

static int query_formats ( AVFilterContext ctx)
static

Definition at line 100 of file vf_overlay.c.

static int config_input_main ( AVFilterLink inlink)
static

Definition at line 114 of file vf_overlay.c.

static int config_input_overlay ( AVFilterLink inlink)
static

Definition at line 126 of file vf_overlay.c.

static int config_output ( AVFilterLink outlink)
static

Definition at line 187 of file vf_overlay.c.

static void blend_frame ( AVFilterContext ctx,
AVFrame dst,
AVFrame src,
int  x,
int  y 
)
static

Definition at line 198 of file vf_overlay.c.

Referenced by handle_overlay_eof(), and request_frame().

static int filter_frame_main ( AVFilterLink inlink,
AVFrame frame 
)
static

Definition at line 274 of file vf_overlay.c.

static int filter_frame_overlay ( AVFilterLink inlink,
AVFrame frame 
)
static

Definition at line 284 of file vf_overlay.c.

static int output_frame ( AVFilterContext ctx)
static

Definition at line 294 of file vf_overlay.c.

Referenced by handle_overlay_eof(), and request_frame().

static int handle_overlay_eof ( AVFilterContext ctx)
static

Definition at line 304 of file vf_overlay.c.

Referenced by request_frame().

static int request_frame ( AVFilterLink outlink)
static

Definition at line 316 of file vf_overlay.c.

Variable Documentation

const char* const var_names[]
static
Initial value:
{
"E",
"PHI",
"PI",
"main_w", "W",
"main_h", "H",
"overlay_w", "w",
"overlay_h", "h",
}

Definition at line 41 of file vf_overlay.c.

Referenced by config_input_overlay().

const char* eof_action_str[]
static
Initial value:
{
"repeat", "endall", "pass"
}

Definition at line 69 of file vf_overlay.c.

Referenced by config_input_overlay().

const AVOption options[]
static
Initial value:
{
{ "x", "Horizontal position of the left edge of the overlaid video on the "
"main video.", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
{ "y", "Vertical position of the top edge of the overlaid video on the "
"main video.", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
{ "eof_action", "Action to take when encountering EOF from secondary input ",
OFFSET(eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT },
EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, "eof_action" },
{ "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, "eof_action" },
{ "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, "eof_action" },
{ "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, "eof_action" },
{ NULL },
}

Definition at line 368 of file vf_overlay.c.

const AVClass overlay_class
static
Initial value:
{
.class_name = "overlay",
.item_name = av_default_item_name,
.option = options,
}

Definition at line 382 of file vf_overlay.c.

const AVFilterPad avfilter_vf_overlay_inputs[]
static
Initial value:
{
{
.name = "main",
.config_props = config_input_main,
.filter_frame = filter_frame_main,
.needs_writable = 1,
.needs_fifo = 1,
},
{
.name = "overlay",
.config_props = config_input_overlay,
.filter_frame = filter_frame_overlay,
.needs_fifo = 1,
},
{ NULL }
}

Definition at line 389 of file vf_overlay.c.

const AVFilterPad avfilter_vf_overlay_outputs[]
static
Initial value:
{
{
.name = "default",
.config_props = config_output,
.request_frame = request_frame,
},
{ NULL }
}

Definition at line 408 of file vf_overlay.c.

AVFilter ff_vf_overlay
Initial value:
{
.name = "overlay",
.description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
.uninit = uninit,
.priv_size = sizeof(OverlayContext),
.priv_class = &overlay_class,
}

Definition at line 418 of file vf_overlay.c.