0,0 → 1,339 |
/* |
* Copyright (c) 2013 Clément Bœsch |
* |
* 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 |
*/ |
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#include <float.h> /* DBL_MAX */ |
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#include "libavutil/opt.h" |
#include "libavutil/eval.h" |
#include "libavutil/avassert.h" |
#include "libavutil/pixdesc.h" |
#include "avfilter.h" |
#include "formats.h" |
#include "internal.h" |
#include "video.h" |
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static const char *const var_names[] = { |
"w", // stream width |
"h", // stream height |
"n", // frame count |
"pts", // presentation timestamp expressed in AV_TIME_BASE units |
"r", // frame rate |
"t", // timestamp expressed in seconds |
"tb", // timebase |
NULL |
}; |
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enum var_name { |
VAR_W, |
VAR_H, |
VAR_N, |
VAR_PTS, |
VAR_R, |
VAR_T, |
VAR_TB, |
VAR_NB |
}; |
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typedef struct { |
const AVClass *class; |
const AVPixFmtDescriptor *desc; |
int backward; |
enum EvalMode { EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB } eval_mode; |
#define DEF_EXPR_FIELDS(name) AVExpr *name##_pexpr; char *name##_expr; double name |
DEF_EXPR_FIELDS(angle); |
DEF_EXPR_FIELDS(x0); |
DEF_EXPR_FIELDS(y0); |
double var_values[VAR_NB]; |
float *fmap; |
int fmap_linesize; |
double dmax; |
float xscale, yscale; |
uint32_t dither; |
int do_dither; |
AVRational aspect; |
AVRational scale; |
} VignetteContext; |
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#define OFFSET(x) offsetof(VignetteContext, x) |
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
static const AVOption vignette_options[] = { |
{ "angle", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS }, |
{ "a", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS }, |
{ "x0", "set circle center position on x-axis", OFFSET(x0_expr), AV_OPT_TYPE_STRING, {.str="w/2"}, .flags = FLAGS }, |
{ "y0", "set circle center position on y-axis", OFFSET(y0_expr), AV_OPT_TYPE_STRING, {.str="h/2"}, .flags = FLAGS }, |
{ "mode", "set forward/backward mode", OFFSET(backward), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS, "mode" }, |
{ "forward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, FLAGS, "mode"}, |
{ "backward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, FLAGS, "mode"}, |
{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 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 for each frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" }, |
{ "dither", "set dithering", OFFSET(do_dither), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, FLAGS }, |
{ "aspect", "set aspect ratio", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 1}, 0, DBL_MAX, .flags = FLAGS }, |
{ NULL } |
}; |
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AVFILTER_DEFINE_CLASS(vignette); |
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static av_cold int init(AVFilterContext *ctx) |
{ |
VignetteContext *s = ctx->priv; |
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#define PARSE_EXPR(name) do { \ |
int ret = av_expr_parse(&s->name##_pexpr, s->name##_expr, var_names, \ |
NULL, NULL, NULL, NULL, 0, ctx); \ |
if (ret < 0) { \ |
av_log(ctx, AV_LOG_ERROR, "Unable to parse expression for '" \ |
AV_STRINGIFY(name) "'\n"); \ |
return ret; \ |
} \ |
} while (0) |
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PARSE_EXPR(angle); |
PARSE_EXPR(x0); |
PARSE_EXPR(y0); |
return 0; |
} |
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static av_cold void uninit(AVFilterContext *ctx) |
{ |
VignetteContext *s = ctx->priv; |
av_freep(&s->fmap); |
av_expr_free(s->angle_pexpr); |
av_expr_free(s->x0_pexpr); |
av_expr_free(s->y0_pexpr); |
} |
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static int query_formats(AVFilterContext *ctx) |
{ |
static const enum AVPixelFormat pix_fmts[] = { |
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, |
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, |
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, |
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, |
AV_PIX_FMT_GRAY8, |
AV_PIX_FMT_NONE |
}; |
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
return 0; |
} |
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static double get_natural_factor(const VignetteContext *s, int x, int y) |
{ |
const int xx = (x - s->x0) * s->xscale; |
const int yy = (y - s->y0) * s->yscale; |
const double dnorm = hypot(xx, yy) / s->dmax; |
if (dnorm > 1) { |
return 0; |
} else { |
const double c = cos(s->angle * dnorm); |
return (c*c)*(c*c); // do not remove braces, it helps compilers |
} |
} |
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#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)) |
#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts) * av_q2d(tb)) |
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static void update_context(VignetteContext *s, AVFilterLink *inlink, AVFrame *frame) |
{ |
int x, y; |
float *dst = s->fmap; |
int dst_linesize = s->fmap_linesize; |
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if (frame) { |
s->var_values[VAR_N] = inlink->frame_count; |
s->var_values[VAR_T] = TS2T(frame->pts, inlink->time_base); |
s->var_values[VAR_PTS] = TS2D(frame->pts); |
} else { |
s->var_values[VAR_N] = 0; |
s->var_values[VAR_T] = NAN; |
s->var_values[VAR_PTS] = NAN; |
} |
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s->angle = av_clipf(av_expr_eval(s->angle_pexpr, s->var_values, NULL), 0, M_PI_2); |
s->x0 = av_expr_eval(s->x0_pexpr, s->var_values, NULL); |
s->y0 = av_expr_eval(s->y0_pexpr, s->var_values, NULL); |
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if (s->backward) { |
for (y = 0; y < inlink->h; y++) { |
for (x = 0; x < inlink->w; x++) |
dst[x] = 1. / get_natural_factor(s, x, y); |
dst += dst_linesize; |
} |
} else { |
for (y = 0; y < inlink->h; y++) { |
for (x = 0; x < inlink->w; x++) |
dst[x] = get_natural_factor(s, x, y); |
dst += dst_linesize; |
} |
} |
} |
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static inline double get_dither_value(VignetteContext *s) |
{ |
double dv = 0; |
if (s->do_dither) { |
dv = s->dither / (double)(1LL<<32); |
s->dither = s->dither * 1664525 + 1013904223; |
} |
return dv; |
} |
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static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
{ |
unsigned x, y; |
AVFilterContext *ctx = inlink->dst; |
VignetteContext *s = ctx->priv; |
AVFilterLink *outlink = inlink->dst->outputs[0]; |
AVFrame *out; |
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
if (!out) { |
av_frame_free(&in); |
return AVERROR(ENOMEM); |
} |
av_frame_copy_props(out, in); |
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if (s->eval_mode == EVAL_MODE_FRAME) |
update_context(s, inlink, in); |
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if (s->desc->flags & AV_PIX_FMT_FLAG_RGB) { |
uint8_t *dst = out->data[0]; |
const uint8_t *src = in ->data[0]; |
const float *fmap = s->fmap; |
const int dst_linesize = out->linesize[0]; |
const int src_linesize = in ->linesize[0]; |
const int fmap_linesize = s->fmap_linesize; |
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for (y = 0; y < inlink->h; y++) { |
uint8_t *dstp = dst; |
const uint8_t *srcp = src; |
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for (x = 0; x < inlink->w; x++, dstp += 3, srcp += 3) { |
const float f = fmap[x]; |
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dstp[0] = av_clip_uint8(srcp[0] * f + get_dither_value(s)); |
dstp[1] = av_clip_uint8(srcp[1] * f + get_dither_value(s)); |
dstp[2] = av_clip_uint8(srcp[2] * f + get_dither_value(s)); |
} |
dst += dst_linesize; |
src += src_linesize; |
fmap += fmap_linesize; |
} |
} else { |
int plane; |
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for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) { |
uint8_t *dst = out->data[plane]; |
const uint8_t *src = in ->data[plane]; |
const float *fmap = s->fmap; |
const int dst_linesize = out->linesize[plane]; |
const int src_linesize = in ->linesize[plane]; |
const int fmap_linesize = s->fmap_linesize; |
const int chroma = plane == 1 || plane == 2; |
const int hsub = chroma ? s->desc->log2_chroma_w : 0; |
const int vsub = chroma ? s->desc->log2_chroma_h : 0; |
const int w = FF_CEIL_RSHIFT(inlink->w, hsub); |
const int h = FF_CEIL_RSHIFT(inlink->h, vsub); |
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for (y = 0; y < h; y++) { |
uint8_t *dstp = dst; |
const uint8_t *srcp = src; |
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for (x = 0; x < w; x++) { |
const double dv = get_dither_value(s); |
if (chroma) *dstp++ = av_clip_uint8(fmap[x << hsub] * (*srcp++ - 127) + 127 + dv); |
else *dstp++ = av_clip_uint8(fmap[x ] * *srcp++ + dv); |
} |
dst += dst_linesize; |
src += src_linesize; |
fmap += fmap_linesize << vsub; |
} |
} |
} |
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return ff_filter_frame(outlink, out); |
} |
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static int config_props(AVFilterLink *inlink) |
{ |
VignetteContext *s = inlink->dst->priv; |
AVRational sar = inlink->sample_aspect_ratio; |
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s->desc = av_pix_fmt_desc_get(inlink->format); |
s->var_values[VAR_W] = inlink->w; |
s->var_values[VAR_H] = inlink->h; |
s->var_values[VAR_TB] = av_q2d(inlink->time_base); |
s->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ? |
NAN : av_q2d(inlink->frame_rate); |
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if (!sar.num || !sar.den) |
sar.num = sar.den = 1; |
if (sar.num > sar.den) { |
s->xscale = av_q2d(av_div_q(sar, s->aspect)); |
s->yscale = 1; |
} else { |
s->yscale = av_q2d(av_div_q(s->aspect, sar)); |
s->xscale = 1; |
} |
s->dmax = hypot(inlink->w / 2., inlink->h / 2.); |
av_log(s, AV_LOG_DEBUG, "xscale=%f yscale=%f dmax=%f\n", |
s->xscale, s->yscale, s->dmax); |
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s->fmap_linesize = FFALIGN(inlink->w, 32); |
s->fmap = av_malloc(s->fmap_linesize * inlink->h * sizeof(*s->fmap)); |
if (!s->fmap) |
return AVERROR(ENOMEM); |
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if (s->eval_mode == EVAL_MODE_INIT) |
update_context(s, inlink, NULL); |
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return 0; |
} |
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static const AVFilterPad vignette_inputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
.filter_frame = filter_frame, |
.config_props = config_props, |
}, |
{ NULL } |
}; |
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static const AVFilterPad vignette_outputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
}, |
{ NULL } |
}; |
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AVFilter avfilter_vf_vignette = { |
.name = "vignette", |
.description = NULL_IF_CONFIG_SMALL("Make or reverse a vignette effect."), |
.priv_size = sizeof(VignetteContext), |
.init = init, |
.uninit = uninit, |
.query_formats = query_formats, |
.inputs = vignette_inputs, |
.outputs = vignette_outputs, |
.priv_class = &vignette_class, |
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
}; |