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ffmpeg/libavfilter/vf_overlay.c
Bela Bodecs cc83177db4 vf_overlay: handles expression evaluation of frame size change in frame-by-frame evalutaion mode 
vf_overlay video filter accepts expressions in its parameters. In
'frame-by-frame' evaluation mode it recalculates them regularly, but
incoming video frame size changes did not reflect in their values. So if
you used width or height of any source videos in expressions as
parameters, they stayed on their initial values. This patch corrects
this bug.

Signed-off-by: Bela Bodecs <bodecsb@vivanet.hu>
Reviewed-by: Paul B Mahol <onemda@gmail.com
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2016-01-19 23:30:36 +01:00

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/*
* Copyright (c) 2010 Stefano Sabatini
* Copyright (c) 2010 Baptiste Coudurier
* Copyright (c) 2007 Bobby Bingham
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* overlay one video on top of another
*/
#include "avfilter.h"
#include "formats.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/avstring.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/timestamp.h"
#include "internal.h"
#include "dualinput.h"
#include "drawutils.h"
#include "video.h"
static const char *const var_names[] = {
"main_w", "W", ///< width of the main video
"main_h", "H", ///< height of the main video
"overlay_w", "w", ///< width of the overlay video
"overlay_h", "h", ///< height of the overlay video
"hsub",
"vsub",
"x",
"y",
"n", ///< number of frame
"pos", ///< position in the file
"t", ///< timestamp expressed in seconds
NULL
};
enum var_name {
VAR_MAIN_W, VAR_MW,
VAR_MAIN_H, VAR_MH,
VAR_OVERLAY_W, VAR_OW,
VAR_OVERLAY_H, VAR_OH,
VAR_HSUB,
VAR_VSUB,
VAR_X,
VAR_Y,
VAR_N,
VAR_POS,
VAR_T,
VAR_VARS_NB
};
enum EOFAction {
EOF_ACTION_REPEAT,
EOF_ACTION_ENDALL,
EOF_ACTION_PASS
};
static const char * const eof_action_str[] = {
"repeat", "endall", "pass"
};
#define MAIN 0
#define OVERLAY 1
#define R 0
#define G 1
#define B 2
#define A 3
#define Y 0
#define U 1
#define V 2
enum EvalMode {
EVAL_MODE_INIT,
EVAL_MODE_FRAME,
EVAL_MODE_NB
};
enum OverlayFormat {
OVERLAY_FORMAT_YUV420,
OVERLAY_FORMAT_YUV422,
OVERLAY_FORMAT_YUV444,
OVERLAY_FORMAT_RGB,
OVERLAY_FORMAT_NB
};
typedef struct OverlayContext {
const AVClass *class;
int x, y; ///< position of overlayed picture
int allow_packed_rgb;
uint8_t main_is_packed_rgb;
uint8_t main_rgba_map[4];
uint8_t main_has_alpha;
uint8_t overlay_is_packed_rgb;
uint8_t overlay_rgba_map[4];
uint8_t overlay_has_alpha;
int format; ///< OverlayFormat
int eval_mode; ///< EvalMode
FFDualInputContext dinput;
int main_pix_step[4]; ///< steps per pixel for each plane of the main output
int overlay_pix_step[4]; ///< steps per pixel for each plane of the overlay
int hsub, vsub; ///< chroma subsampling values
double var_values[VAR_VARS_NB];
char *x_expr, *y_expr;
int eof_action; ///< action to take on EOF from source
AVExpr *x_pexpr, *y_pexpr;
} OverlayContext;
static av_cold void uninit(AVFilterContext *ctx)
{
OverlayContext *s = ctx->priv;
ff_dualinput_uninit(&s->dinput);
av_expr_free(s->x_pexpr); s->x_pexpr = NULL;
av_expr_free(s->y_pexpr); s->y_pexpr = NULL;
}
static inline int normalize_xy(double d, int chroma_sub)
{
if (isnan(d))
return INT_MAX;
return (int)d & ~((1 << chroma_sub) - 1);
}
static void eval_expr(AVFilterContext *ctx)
{
OverlayContext *s = ctx->priv;
s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, NULL);
s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
s->x = normalize_xy(s->var_values[VAR_X], s->hsub);
s->y = normalize_xy(s->var_values[VAR_Y], s->vsub);
}
static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
{
int ret;
AVExpr *old = NULL;
if (*pexpr)
old = *pexpr;
ret = av_expr_parse(pexpr, expr, var_names,
NULL, NULL, NULL, NULL, 0, log_ctx);
if (ret < 0) {
av_log(log_ctx, AV_LOG_ERROR,
"Error when evaluating the expression '%s' for %s\n",
expr, option);
*pexpr = old;
return ret;
}
av_expr_free(old);
return 0;
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
OverlayContext *s = ctx->priv;
int ret;
if (!strcmp(cmd, "x"))
ret = set_expr(&s->x_pexpr, args, cmd, ctx);
else if (!strcmp(cmd, "y"))
ret = set_expr(&s->y_pexpr, args, cmd, ctx);
else
ret = AVERROR(ENOSYS);
if (ret < 0)
return ret;
if (s->eval_mode == EVAL_MODE_INIT) {
eval_expr(ctx);
av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
s->var_values[VAR_X], s->x,
s->var_values[VAR_Y], s->y);
}
return ret;
}
static int query_formats(AVFilterContext *ctx)
{
OverlayContext *s = ctx->priv;
/* overlay formats contains alpha, for avoiding conversion with alpha information loss */
static const enum AVPixelFormat main_pix_fmts_yuv420[] = {
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat overlay_pix_fmts_yuv420[] = {
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat main_pix_fmts_yuv422[] = {
AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat overlay_pix_fmts_yuv422[] = {
AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat main_pix_fmts_yuv444[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat overlay_pix_fmts_yuv444[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat main_pix_fmts_rgb[] = {
AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat overlay_pix_fmts_rgb[] = {
AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
AV_PIX_FMT_NONE
};
AVFilterFormats *main_formats = NULL;
AVFilterFormats *overlay_formats = NULL;
int ret;
switch (s->format) {
case OVERLAY_FORMAT_YUV420:
if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv420)) ||
!(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420))) {
ret = AVERROR(ENOMEM);
goto fail;
}
break;
case OVERLAY_FORMAT_YUV422:
if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv422)) ||
!(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv422))) {
ret = AVERROR(ENOMEM);
goto fail;
}
break;
case OVERLAY_FORMAT_YUV444:
if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv444)) ||
!(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444))) {
ret = AVERROR(ENOMEM);
goto fail;
}
break;
case OVERLAY_FORMAT_RGB:
if (!(main_formats = ff_make_format_list(main_pix_fmts_rgb)) ||
!(overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb))) {
ret = AVERROR(ENOMEM);
goto fail;
}
break;
default:
av_assert0(0);
}
if ((ret = ff_formats_ref(main_formats , &ctx->inputs[MAIN]->out_formats )) < 0 ||
(ret = ff_formats_ref(overlay_formats, &ctx->inputs[OVERLAY]->out_formats)) < 0 ||
(ret = ff_formats_ref(main_formats , &ctx->outputs[MAIN]->in_formats )) < 0)
goto fail;
return 0;
fail:
if (main_formats)
av_freep(&main_formats->formats);
av_freep(&main_formats);
if (overlay_formats)
av_freep(&overlay_formats->formats);
av_freep(&overlay_formats);
return ret;
}
static const enum AVPixelFormat alpha_pix_fmts[] = {
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA,
AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE
};
static int config_input_main(AVFilterLink *inlink)
{
OverlayContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
av_image_fill_max_pixsteps(s->main_pix_step, NULL, pix_desc);
s->hsub = pix_desc->log2_chroma_w;
s->vsub = pix_desc->log2_chroma_h;
s->main_is_packed_rgb =
ff_fill_rgba_map(s->main_rgba_map, inlink->format) >= 0;
s->main_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
return 0;
}
static int config_input_overlay(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
OverlayContext *s = inlink->dst->priv;
int ret;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
av_image_fill_max_pixsteps(s->overlay_pix_step, NULL, pix_desc);
/* Finish the configuration by evaluating the expressions
now when both inputs are configured. */
s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = ctx->inputs[OVERLAY]->w;
s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = ctx->inputs[OVERLAY]->h;
s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
s->var_values[VAR_X] = NAN;
s->var_values[VAR_Y] = NAN;
s->var_values[VAR_N] = 0;
s->var_values[VAR_T] = NAN;
s->var_values[VAR_POS] = NAN;
if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||
(ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0)
return ret;
s->overlay_is_packed_rgb =
ff_fill_rgba_map(s->overlay_rgba_map, inlink->format) >= 0;
s->overlay_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
if (s->eval_mode == EVAL_MODE_INIT) {
eval_expr(ctx);
av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
s->var_values[VAR_X], s->x,
s->var_values[VAR_Y], s->y);
}
av_log(ctx, AV_LOG_VERBOSE,
"main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s eof_action:%s\n",
ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
av_get_pix_fmt_name(ctx->inputs[MAIN]->format),
ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
av_get_pix_fmt_name(ctx->inputs[OVERLAY]->format),
eof_action_str[s->eof_action]);
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
OverlayContext *s = ctx->priv;
int ret;
if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)
return ret;
outlink->w = ctx->inputs[MAIN]->w;
outlink->h = ctx->inputs[MAIN]->h;
outlink->time_base = ctx->inputs[MAIN]->time_base;
return 0;
}
// divide by 255 and round to nearest
// apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
#define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
// calculate the unpremultiplied alpha, applying the general equation:
// alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
// (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x
// ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)
#define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))
/**
* Blend image in src to destination buffer dst at position (x, y).
*/
static void blend_image(AVFilterContext *ctx,
AVFrame *dst, const AVFrame *src,
int x, int y)
{
OverlayContext *s = ctx->priv;
int i, imax, j, jmax, k, kmax;
const int src_w = src->width;
const int src_h = src->height;
const int dst_w = dst->width;
const int dst_h = dst->height;
if (x >= dst_w || x+src_w < 0 ||
y >= dst_h || y+src_h < 0)
return; /* no intersection */
if (s->main_is_packed_rgb) {
uint8_t alpha; ///< the amount of overlay to blend on to main
const int dr = s->main_rgba_map[R];
const int dg = s->main_rgba_map[G];
const int db = s->main_rgba_map[B];
const int da = s->main_rgba_map[A];
const int dstep = s->main_pix_step[0];
const int sr = s->overlay_rgba_map[R];
const int sg = s->overlay_rgba_map[G];
const int sb = s->overlay_rgba_map[B];
const int sa = s->overlay_rgba_map[A];
const int sstep = s->overlay_pix_step[0];
const int main_has_alpha = s->main_has_alpha;
uint8_t *s, *sp, *d, *dp;
i = FFMAX(-y, 0);
sp = src->data[0] + i * src->linesize[0];
dp = dst->data[0] + (y+i) * dst->linesize[0];
for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
j = FFMAX(-x, 0);
s = sp + j * sstep;
d = dp + (x+j) * dstep;
for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
alpha = s[sa];
// if the main channel has an alpha channel, alpha has to be calculated
// to create an un-premultiplied (straight) alpha value
if (main_has_alpha && alpha != 0 && alpha != 255) {
uint8_t alpha_d = d[da];
alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
}
switch (alpha) {
case 0:
break;
case 255:
d[dr] = s[sr];
d[dg] = s[sg];
d[db] = s[sb];
break;
default:
// main_value = main_value * (1 - alpha) + overlay_value * alpha
// since alpha is in the range 0-255, the result must divided by 255
d[dr] = FAST_DIV255(d[dr] * (255 - alpha) + s[sr] * alpha);
d[dg] = FAST_DIV255(d[dg] * (255 - alpha) + s[sg] * alpha);
d[db] = FAST_DIV255(d[db] * (255 - alpha) + s[sb] * alpha);
}
if (main_has_alpha) {
switch (alpha) {
case 0:
break;
case 255:
d[da] = s[sa];
break;
default:
// apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
d[da] += FAST_DIV255((255 - d[da]) * s[sa]);
}
}
d += dstep;
s += sstep;
}
dp += dst->linesize[0];
sp += src->linesize[0];
}
} else {
const int main_has_alpha = s->main_has_alpha;
if (main_has_alpha) {
uint8_t alpha; ///< the amount of overlay to blend on to main
uint8_t *s, *sa, *d, *da;
i = FFMAX(-y, 0);
sa = src->data[3] + i * src->linesize[3];
da = dst->data[3] + (y+i) * dst->linesize[3];
for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
j = FFMAX(-x, 0);
s = sa + j;
d = da + x+j;
for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
alpha = *s;
if (alpha != 0 && alpha != 255) {
uint8_t alpha_d = *d;
alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
}
switch (alpha) {
case 0:
break;
case 255:
*d = *s;
break;
default:
// apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
*d += FAST_DIV255((255 - *d) * *s);
}
d += 1;
s += 1;
}
da += dst->linesize[3];
sa += src->linesize[3];
}
}
for (i = 0; i < 3; i++) {
int hsub = i ? s->hsub : 0;
int vsub = i ? s->vsub : 0;
int src_wp = FF_CEIL_RSHIFT(src_w, hsub);
int src_hp = FF_CEIL_RSHIFT(src_h, vsub);
int dst_wp = FF_CEIL_RSHIFT(dst_w, hsub);
int dst_hp = FF_CEIL_RSHIFT(dst_h, vsub);
int yp = y>>vsub;
int xp = x>>hsub;
uint8_t *s, *sp, *d, *dp, *a, *ap;
j = FFMAX(-yp, 0);
sp = src->data[i] + j * src->linesize[i];
dp = dst->data[i] + (yp+j) * dst->linesize[i];
ap = src->data[3] + (j<<vsub) * src->linesize[3];
for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) {
k = FFMAX(-xp, 0);
d = dp + xp+k;
s = sp + k;
a = ap + (k<<hsub);
for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) {
int alpha_v, alpha_h, alpha;
// average alpha for color components, improve quality
if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
alpha = (a[0] + a[src->linesize[3]] +
a[1] + a[src->linesize[3]+1]) >> 2;
} else if (hsub || vsub) {
alpha_h = hsub && k+1 < src_wp ?
(a[0] + a[1]) >> 1 : a[0];
alpha_v = vsub && j+1 < src_hp ?
(a[0] + a[src->linesize[3]]) >> 1 : a[0];
alpha = (alpha_v + alpha_h) >> 1;
} else
alpha = a[0];
// if the main channel has an alpha channel, alpha has to be calculated
// to create an un-premultiplied (straight) alpha value
if (main_has_alpha && alpha != 0 && alpha != 255) {
// average alpha for color components, improve quality
uint8_t alpha_d;
if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
alpha_d = (d[0] + d[src->linesize[3]] +
d[1] + d[src->linesize[3]+1]) >> 2;
} else if (hsub || vsub) {
alpha_h = hsub && k+1 < src_wp ?
(d[0] + d[1]) >> 1 : d[0];
alpha_v = vsub && j+1 < src_hp ?
(d[0] + d[src->linesize[3]]) >> 1 : d[0];
alpha_d = (alpha_v + alpha_h) >> 1;
} else
alpha_d = d[0];
alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
}
*d = FAST_DIV255(*d * (255 - alpha) + *s * alpha);
s++;
d++;
a += 1 << hsub;
}
dp += dst->linesize[i];
sp += src->linesize[i];
ap += (1 << vsub) * src->linesize[3];
}
}
}
}
static AVFrame *do_blend(AVFilterContext *ctx, AVFrame *mainpic,
const AVFrame *second)
{
OverlayContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
if (s->eval_mode == EVAL_MODE_FRAME) {
int64_t pos = av_frame_get_pkt_pos(mainpic);
s->var_values[VAR_N] = inlink->frame_count;
s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ?
NAN : mainpic->pts * av_q2d(inlink->time_base);
s->var_values[VAR_POS] = pos == -1 ? NAN : pos;
s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = second->width;
s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = second->height;
s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = mainpic->width;
s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = mainpic->height;
eval_expr(ctx);
av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n",
s->var_values[VAR_N], s->var_values[VAR_T], s->var_values[VAR_POS],
s->var_values[VAR_X], s->x,
s->var_values[VAR_Y], s->y);
}
blend_image(ctx, mainpic, second, s->x, s->y);
return mainpic;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
{
OverlayContext *s = inlink->dst->priv;
av_log(inlink->dst, AV_LOG_DEBUG, "Incoming frame (time:%s) from link #%d\n", av_ts2timestr(inpicref->pts, &inlink->time_base), FF_INLINK_IDX(inlink));
return ff_dualinput_filter_frame(&s->dinput, inlink, inpicref);
}
static int request_frame(AVFilterLink *outlink)
{
OverlayContext *s = outlink->src->priv;
return ff_dualinput_request_frame(&s->dinput, outlink);
}
static av_cold int init(AVFilterContext *ctx)
{
OverlayContext *s = ctx->priv;
if (s->allow_packed_rgb) {
av_log(ctx, AV_LOG_WARNING,
"The rgb option is deprecated and is overriding the format option, use format instead\n");
s->format = OVERLAY_FORMAT_RGB;
}
if (!s->dinput.repeatlast || s->eof_action == EOF_ACTION_PASS) {
s->dinput.repeatlast = 0;
s->eof_action = EOF_ACTION_PASS;
}
if (s->dinput.shortest || s->eof_action == EOF_ACTION_ENDALL) {
s->dinput.shortest = 1;
s->eof_action = EOF_ACTION_ENDALL;
}
s->dinput.process = do_blend;
return 0;
}
#define OFFSET(x) offsetof(OverlayContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption overlay_options[] = {
{ "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
{ "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, 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" },
{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
{ "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
{ "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
{ "rgb", "force packed RGB in input and output (deprecated)", OFFSET(allow_packed_rgb), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ "shortest", "force termination when the shortest input terminates", OFFSET(dinput.shortest), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" },
{ "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" },
{ "yuv422", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV422}, .flags = FLAGS, .unit = "format" },
{ "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" },
{ "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" },
{ "repeatlast", "repeat overlay of the last overlay frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(overlay);
static const AVFilterPad avfilter_vf_overlay_inputs[] = {
{
.name = "main",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input_main,
.filter_frame = filter_frame,
.needs_writable = 1,
},
{
.name = "overlay",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input_overlay,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_overlay_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
.request_frame = request_frame,
},
{ NULL }
};
AVFilter ff_vf_overlay = {
.name = "overlay",
.description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
.init = init,
.uninit = uninit,
.priv_size = sizeof(OverlayContext),
.priv_class = &overlay_class,
.query_formats = query_formats,
.process_command = process_command,
.inputs = avfilter_vf_overlay_inputs,
.outputs = avfilter_vf_overlay_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
};
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