This source file includes following definitions.
- blend_normal
- FFMIN
- filter_slice
- blend_frame
- init
- query_formats
- uninit
- config_output
- request_frame
- filter_frame
- tblend_config_output
- tblend_filter_frame
#include "libavutil/imgutils.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "libavutil/pixfmt.h"
#include "avfilter.h"
#include "bufferqueue.h"
#include "formats.h"
#include "internal.h"
#include "dualinput.h"
#include "video.h"
#define TOP 0
#define BOTTOM 1
enum BlendMode {
BLEND_UNSET = -1,
BLEND_NORMAL,
BLEND_ADDITION,
BLEND_AND,
BLEND_AVERAGE,
BLEND_BURN,
BLEND_DARKEN,
BLEND_DIFFERENCE,
BLEND_DIFFERENCE128,
BLEND_DIVIDE,
BLEND_DODGE,
BLEND_EXCLUSION,
BLEND_HARDLIGHT,
BLEND_LIGHTEN,
BLEND_MULTIPLY,
BLEND_NEGATION,
BLEND_OR,
BLEND_OVERLAY,
BLEND_PHOENIX,
BLEND_PINLIGHT,
BLEND_REFLECT,
BLEND_SCREEN,
BLEND_SOFTLIGHT,
BLEND_SUBTRACT,
BLEND_VIVIDLIGHT,
BLEND_XOR,
BLEND_NB
};
static const char *const var_names[] = { "X", "Y", "W", "H", "SW", "SH", "T", "N", "A", "B", "TOP", "BOTTOM", NULL };
enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_SW, VAR_SH, VAR_T, VAR_N, VAR_A, VAR_B, VAR_TOP, VAR_BOTTOM, VAR_VARS_NB };
typedef struct FilterParams {
enum BlendMode mode;
double opacity;
AVExpr *e;
char *expr_str;
void (*blend)(const uint8_t *top, int top_linesize,
const uint8_t *bottom, int bottom_linesize,
uint8_t *dst, int dst_linesize,
int width, int start, int end,
struct FilterParams *param, double *values);
} FilterParams;
typedef struct ThreadData {
const AVFrame *top, *bottom;
AVFrame *dst;
AVFilterLink *inlink;
int plane;
int w, h;
FilterParams *param;
} ThreadData;
typedef struct {
const AVClass *class;
FFDualInputContext dinput;
int hsub, vsub;
int nb_planes;
char *all_expr;
enum BlendMode all_mode;
double all_opacity;
FilterParams params[4];
int tblend;
AVFrame *prev_frame;
} BlendContext;
#define COMMON_OPTIONS \
{ "c0_mode", "set component #0 blend mode", OFFSET(params[0].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\
{ "c1_mode", "set component #1 blend mode", OFFSET(params[1].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\
{ "c2_mode", "set component #2 blend mode", OFFSET(params[2].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\
{ "c3_mode", "set component #3 blend mode", OFFSET(params[3].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\
{ "all_mode", "set blend mode for all components", OFFSET(all_mode), AV_OPT_TYPE_INT, {.i64=-1},-1, BLEND_NB-1, FLAGS, "mode"},\
{ "addition", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_ADDITION}, 0, 0, FLAGS, "mode" },\
{ "and", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AND}, 0, 0, FLAGS, "mode" },\
{ "average", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AVERAGE}, 0, 0, FLAGS, "mode" },\
{ "burn", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_BURN}, 0, 0, FLAGS, "mode" },\
{ "darken", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DARKEN}, 0, 0, FLAGS, "mode" },\
{ "difference", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIFFERENCE}, 0, 0, FLAGS, "mode" },\
{ "difference128", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIFFERENCE128}, 0, 0, FLAGS, "mode" },\
{ "divide", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIVIDE}, 0, 0, FLAGS, "mode" },\
{ "dodge", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DODGE}, 0, 0, FLAGS, "mode" },\
{ "exclusion", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_EXCLUSION}, 0, 0, FLAGS, "mode" },\
{ "hardlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HARDLIGHT}, 0, 0, FLAGS, "mode" },\
{ "lighten", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_LIGHTEN}, 0, 0, FLAGS, "mode" },\
{ "multiply", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_MULTIPLY}, 0, 0, FLAGS, "mode" },\
{ "negation", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NEGATION}, 0, 0, FLAGS, "mode" },\
{ "normal", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NORMAL}, 0, 0, FLAGS, "mode" },\
{ "or", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OR}, 0, 0, FLAGS, "mode" },\
{ "overlay", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OVERLAY}, 0, 0, FLAGS, "mode" },\
{ "phoenix", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PHOENIX}, 0, 0, FLAGS, "mode" },\
{ "pinlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PINLIGHT}, 0, 0, FLAGS, "mode" },\
{ "reflect", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_REFLECT}, 0, 0, FLAGS, "mode" },\
{ "screen", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SCREEN}, 0, 0, FLAGS, "mode" },\
{ "softlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SOFTLIGHT}, 0, 0, FLAGS, "mode" },\
{ "subtract", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SUBTRACT}, 0, 0, FLAGS, "mode" },\
{ "vividlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_VIVIDLIGHT}, 0, 0, FLAGS, "mode" },\
{ "xor", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_XOR}, 0, 0, FLAGS, "mode" },\
{ "c0_expr", "set color component #0 expression", OFFSET(params[0].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\
{ "c1_expr", "set color component #1 expression", OFFSET(params[1].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\
{ "c2_expr", "set color component #2 expression", OFFSET(params[2].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\
{ "c3_expr", "set color component #3 expression", OFFSET(params[3].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\
{ "all_expr", "set expression for all color components", OFFSET(all_expr), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\
{ "c0_opacity", "set color component #0 opacity", OFFSET(params[0].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\
{ "c1_opacity", "set color component #1 opacity", OFFSET(params[1].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\
{ "c2_opacity", "set color component #2 opacity", OFFSET(params[2].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\
{ "c3_opacity", "set color component #3 opacity", OFFSET(params[3].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\
{ "all_opacity", "set opacity for all color components", OFFSET(all_opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS}
#define OFFSET(x) offsetof(BlendContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption blend_options[] = {
COMMON_OPTIONS,
{ "shortest", "force termination when the shortest input terminates", OFFSET(dinput.shortest), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
{ "repeatlast", "repeat last bottom frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(blend);
static void blend_normal(const uint8_t *top, int top_linesize,
const uint8_t *bottom, int bottom_linesize,
uint8_t *dst, int dst_linesize,
int width, int start, int end,
FilterParams *param, double *values)
{
av_image_copy_plane(dst, dst_linesize, top, top_linesize, width, end - start);
}
#define DEFINE_BLEND(name, expr) \
static void blend_## name(const uint8_t *top, int top_linesize, \
const uint8_t *bottom, int bottom_linesize, \
uint8_t *dst, int dst_linesize, \
int width, int start, int end, \
FilterParams *param, double *values) \
{ \
double opacity = param->opacity; \
int i, j; \
\
for (i = start; i < end; i++) { \
for (j = 0; j < width; j++) { \
dst[j] = top[j] + ((expr) - top[j]) * opacity; \
} \
dst += dst_linesize; \
top += top_linesize; \
bottom += bottom_linesize; \
} \
}
#define A top[j]
#define B bottom[j]
#define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 255))
#define SCREEN(x, a, b) (255 - (x) * ((255 - (a)) * (255 - (b)) / 255))
#define BURN(a, b) (((a) == 0) ? (a) : FFMAX(0, 255 - ((255 - (b)) << 8) / (a)))
#define DODGE(a, b) (((a) == 255) ? (a) : FFMIN(255, (((b) << 8) / (255 - (a)))))
DEFINE_BLEND(addition, FFMIN(255, A + B))
DEFINE_BLEND(average, (A + B) / 2)
DEFINE_BLEND(subtract, FFMAX(0, A - B))
DEFINE_BLEND(multiply, MULTIPLY(1, A, B))
DEFINE_BLEND(negation, 255 - FFABS(255 - A - B))
DEFINE_BLEND(difference, FFABS(A - B))
DEFINE_BLEND(difference128, av_clip_uint8(128 + A - B))
DEFINE_BLEND(screen, SCREEN(1, A, B))
DEFINE_BLEND(overlay, (A < 128) ? MULTIPLY(2, A, B) : SCREEN(2, A, B))
DEFINE_BLEND(hardlight, (B < 128) ? MULTIPLY(2, B, A) : SCREEN(2, B, A))
DEFINE_BLEND(darken, FFMIN(A, B))
DEFINE_BLEND(lighten, FFMAX(A, B))
DEFINE_BLEND(divide, ((float)A / ((float)B) * 255))
DEFINE_BLEND(dodge, DODGE(A, B))
DEFINE_BLEND(burn, BURN(A, B))
DEFINE_BLEND(softlight, (A > 127) ? B + (255 - B) * (A - 127.5) / 127.5 * (0.5 - FFABS(B - 127.5) / 255): B - B * ((127.5 - A) / 127.5) * (0.5 - FFABS(B - 127.5)/255))
DEFINE_BLEND(exclusion, A + B - 2 * A * B / 255)
DEFINE_BLEND(pinlight, (B < 128) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 128)))
DEFINE_BLEND(phoenix, FFMIN(A, B) - FFMAX(A, B) + 255)
DEFINE_BLEND(reflect, (B == 255) ? B : FFMIN(255, (A * A / (255 - B))))
DEFINE_BLEND(and, A & B)
DEFINE_BLEND(or, A | B)
DEFINE_BLEND(xor, A ^ B)
DEFINE_BLEND(vividlight, (B < 128) ? BURN(A, 2 * B) : DODGE(A, 2 * (B - 128)))
static void blend_expr(const uint8_t *top, int top_linesize,
const uint8_t *bottom, int bottom_linesize,
uint8_t *dst, int dst_linesize,
int width, int start, int end,
FilterParams *param, double *values)
{
AVExpr *e = param->e;
int y, x;
for (y = start; y < end; y++) {
values[VAR_Y] = y;
for (x = 0; x < width; x++) {
values[VAR_X] = x;
values[VAR_TOP] = values[VAR_A] = top[x];
values[VAR_BOTTOM] = values[VAR_B] = bottom[x];
dst[x] = av_expr_eval(e, values, NULL);
}
dst += dst_linesize;
top += top_linesize;
bottom += bottom_linesize;
}
}
static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
ThreadData *td = arg;
int slice_start = (td->h * jobnr ) / nb_jobs;
int slice_end = (td->h * (jobnr+1)) / nb_jobs;
const uint8_t *top = td->top->data[td->plane];
const uint8_t *bottom = td->bottom->data[td->plane];
uint8_t *dst = td->dst->data[td->plane];
double values[VAR_VARS_NB];
values[VAR_N] = td->inlink->frame_count;
values[VAR_T] = td->dst->pts == AV_NOPTS_VALUE ? NAN : td->dst->pts * av_q2d(td->inlink->time_base);
values[VAR_W] = td->w;
values[VAR_H] = td->h;
values[VAR_SW] = td->w / (double)td->dst->width;
values[VAR_SH] = td->h / (double)td->dst->height;
td->param->blend(top + slice_start * td->top->linesize[td->plane],
td->top->linesize[td->plane],
bottom + slice_start * td->bottom->linesize[td->plane],
td->bottom->linesize[td->plane],
dst + slice_start * td->dst->linesize[td->plane],
td->dst->linesize[td->plane],
td->w, slice_start, slice_end, td->param, &values[0]);
return 0;
}
static AVFrame *blend_frame(AVFilterContext *ctx, AVFrame *top_buf,
const AVFrame *bottom_buf)
{
BlendContext *b = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *dst_buf;
int plane;
dst_buf = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!dst_buf)
return top_buf;
av_frame_copy_props(dst_buf, top_buf);
for (plane = 0; plane < b->nb_planes; plane++) {
int hsub = plane == 1 || plane == 2 ? b->hsub : 0;
int vsub = plane == 1 || plane == 2 ? b->vsub : 0;
int outw = FF_CEIL_RSHIFT(dst_buf->width, hsub);
int outh = FF_CEIL_RSHIFT(dst_buf->height, vsub);
FilterParams *param = &b->params[plane];
ThreadData td = { .top = top_buf, .bottom = bottom_buf, .dst = dst_buf,
.w = outw, .h = outh, .param = param, .plane = plane,
.inlink = inlink };
ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outh, ctx->graph->nb_threads));
}
if (!b->tblend)
av_frame_free(&top_buf);
return dst_buf;
}
static av_cold int init(AVFilterContext *ctx)
{
BlendContext *b = ctx->priv;
int ret, plane;
b->tblend = !strcmp(ctx->filter->name, "tblend");
for (plane = 0; plane < FF_ARRAY_ELEMS(b->params); plane++) {
FilterParams *param = &b->params[plane];
if (b->all_mode >= 0)
param->mode = b->all_mode;
if (b->all_opacity < 1)
param->opacity = b->all_opacity;
switch (param->mode) {
case BLEND_ADDITION: param->blend = blend_addition; break;
case BLEND_AND: param->blend = blend_and; break;
case BLEND_AVERAGE: param->blend = blend_average; break;
case BLEND_BURN: param->blend = blend_burn; break;
case BLEND_DARKEN: param->blend = blend_darken; break;
case BLEND_DIFFERENCE: param->blend = blend_difference; break;
case BLEND_DIFFERENCE128: param->blend = blend_difference128; break;
case BLEND_DIVIDE: param->blend = blend_divide; break;
case BLEND_DODGE: param->blend = blend_dodge; break;
case BLEND_EXCLUSION: param->blend = blend_exclusion; break;
case BLEND_HARDLIGHT: param->blend = blend_hardlight; break;
case BLEND_LIGHTEN: param->blend = blend_lighten; break;
case BLEND_MULTIPLY: param->blend = blend_multiply; break;
case BLEND_NEGATION: param->blend = blend_negation; break;
case BLEND_NORMAL: param->blend = blend_normal; break;
case BLEND_OR: param->blend = blend_or; break;
case BLEND_OVERLAY: param->blend = blend_overlay; break;
case BLEND_PHOENIX: param->blend = blend_phoenix; break;
case BLEND_PINLIGHT: param->blend = blend_pinlight; break;
case BLEND_REFLECT: param->blend = blend_reflect; break;
case BLEND_SCREEN: param->blend = blend_screen; break;
case BLEND_SOFTLIGHT: param->blend = blend_softlight; break;
case BLEND_SUBTRACT: param->blend = blend_subtract; break;
case BLEND_VIVIDLIGHT: param->blend = blend_vividlight; break;
case BLEND_XOR: param->blend = blend_xor; break;
}
if (b->all_expr && !param->expr_str) {
param->expr_str = av_strdup(b->all_expr);
if (!param->expr_str)
return AVERROR(ENOMEM);
}
if (param->expr_str) {
ret = av_expr_parse(¶m->e, param->expr_str, var_names,
NULL, NULL, NULL, NULL, 0, ctx);
if (ret < 0)
return ret;
param->blend = blend_expr;
}
}
b->dinput.process = blend_frame;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
BlendContext *b = ctx->priv;
int i;
ff_dualinput_uninit(&b->dinput);
av_frame_free(&b->prev_frame);
for (i = 0; i < FF_ARRAY_ELEMS(b->params); i++)
av_expr_free(b->params[i].e);
}
#if CONFIG_BLEND_FILTER
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *toplink = ctx->inputs[TOP];
AVFilterLink *bottomlink = ctx->inputs[BOTTOM];
BlendContext *b = ctx->priv;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(toplink->format);
int ret;
if (toplink->format != bottomlink->format) {
av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
return AVERROR(EINVAL);
}
if (toplink->w != bottomlink->w ||
toplink->h != bottomlink->h ||
toplink->sample_aspect_ratio.num != bottomlink->sample_aspect_ratio.num ||
toplink->sample_aspect_ratio.den != bottomlink->sample_aspect_ratio.den) {
av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "
"(size %dx%d, SAR %d:%d) do not match the corresponding "
"second input link %s parameters (%dx%d, SAR %d:%d)\n",
ctx->input_pads[TOP].name, toplink->w, toplink->h,
toplink->sample_aspect_ratio.num,
toplink->sample_aspect_ratio.den,
ctx->input_pads[BOTTOM].name, bottomlink->w, bottomlink->h,
bottomlink->sample_aspect_ratio.num,
bottomlink->sample_aspect_ratio.den);
return AVERROR(EINVAL);
}
outlink->w = toplink->w;
outlink->h = toplink->h;
outlink->time_base = toplink->time_base;
outlink->sample_aspect_ratio = toplink->sample_aspect_ratio;
outlink->frame_rate = toplink->frame_rate;
b->hsub = pix_desc->log2_chroma_w;
b->vsub = pix_desc->log2_chroma_h;
b->nb_planes = av_pix_fmt_count_planes(toplink->format);
if ((ret = ff_dualinput_init(ctx, &b->dinput)) < 0)
return ret;
return 0;
}
static int request_frame(AVFilterLink *outlink)
{
BlendContext *b = outlink->src->priv;
return ff_dualinput_request_frame(&b->dinput, outlink);
}
static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
{
BlendContext *b = inlink->dst->priv;
return ff_dualinput_filter_frame(&b->dinput, inlink, buf);
}
static const AVFilterPad blend_inputs[] = {
{
.name = "top",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},{
.name = "bottom",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad blend_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
.request_frame = request_frame,
},
{ NULL }
};
AVFilter ff_vf_blend = {
.name = "blend",
.description = NULL_IF_CONFIG_SMALL("Blend two video frames into each other."),
.init = init,
.uninit = uninit,
.priv_size = sizeof(BlendContext),
.query_formats = query_formats,
.inputs = blend_inputs,
.outputs = blend_outputs,
.priv_class = &blend_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
};
#endif
#if CONFIG_TBLEND_FILTER
static int tblend_config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = ctx->inputs[0];
BlendContext *b = ctx->priv;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
b->hsub = pix_desc->log2_chroma_w;
b->vsub = pix_desc->log2_chroma_h;
b->nb_planes = av_pix_fmt_count_planes(inlink->format);
outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
return 0;
}
static int tblend_filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
BlendContext *b = inlink->dst->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
if (b->prev_frame) {
AVFrame *out = blend_frame(inlink->dst, frame, b->prev_frame);
av_frame_free(&b->prev_frame);
b->prev_frame = frame;
return ff_filter_frame(outlink, out);
}
b->prev_frame = frame;
return 0;
}
static const AVOption tblend_options[] = {
COMMON_OPTIONS,
{ NULL }
};
AVFILTER_DEFINE_CLASS(tblend);
static const AVFilterPad tblend_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = tblend_filter_frame,
},
{ NULL }
};
static const AVFilterPad tblend_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = tblend_config_output,
},
{ NULL }
};
AVFilter ff_vf_tblend = {
.name = "tblend",
.description = NULL_IF_CONFIG_SMALL("Blend successive frames."),
.priv_size = sizeof(BlendContext),
.priv_class = &tblend_class,
.query_formats = query_formats,
.init = init,
.uninit = uninit,
.inputs = tblend_inputs,
.outputs = tblend_outputs,
.flags = AVFILTER_FLAG_SLICE_THREADS,
};
#endif