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/* |
* 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 |
*/ |
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/** |
* @file |
* video crop filter |
*/ |
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#include <stdio.h> |
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#include "avfilter.h" |
#include "formats.h" |
#include "internal.h" |
#include "video.h" |
#include "libavutil/eval.h" |
#include "libavutil/avstring.h" |
#include "libavutil/internal.h" |
#include "libavutil/libm.h" |
#include "libavutil/imgutils.h" |
#include "libavutil/mathematics.h" |
#include "libavutil/opt.h" |
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static const char *const var_names[] = { |
"in_w", "iw", ///< width of the input video |
"in_h", "ih", ///< height of the input video |
"out_w", "ow", ///< width of the cropped video |
"out_h", "oh", ///< height of the cropped video |
"a", |
"sar", |
"dar", |
"hsub", |
"vsub", |
"x", |
"y", |
"n", ///< number of frame |
"pos", ///< position in the file |
"t", ///< timestamp expressed in seconds |
NULL |
}; |
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enum var_name { |
VAR_IN_W, VAR_IW, |
VAR_IN_H, VAR_IH, |
VAR_OUT_W, VAR_OW, |
VAR_OUT_H, VAR_OH, |
VAR_A, |
VAR_SAR, |
VAR_DAR, |
VAR_HSUB, |
VAR_VSUB, |
VAR_X, |
VAR_Y, |
VAR_N, |
VAR_POS, |
VAR_T, |
VAR_VARS_NB |
}; |
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typedef struct { |
const AVClass *class; |
int x; ///< x offset of the non-cropped area with respect to the input area |
int y; ///< y offset of the non-cropped area with respect to the input area |
int w; ///< width of the cropped area |
int h; ///< height of the cropped area |
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AVRational out_sar; ///< output sample aspect ratio |
int keep_aspect; ///< keep display aspect ratio when cropping |
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int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes |
int hsub, vsub; ///< chroma subsampling |
char *x_expr, *y_expr, *w_expr, *h_expr; |
AVExpr *x_pexpr, *y_pexpr; /* parsed expressions for x and y */ |
double var_values[VAR_VARS_NB]; |
} CropContext; |
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static int query_formats(AVFilterContext *ctx) |
{ |
AVFilterFormats *formats = NULL; |
int fmt; |
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for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) { |
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt); |
if (!(desc->flags & (AV_PIX_FMT_FLAG_HWACCEL | AV_PIX_FMT_FLAG_BITSTREAM)) && |
!((desc->log2_chroma_w || desc->log2_chroma_h) && !(desc->flags & AV_PIX_FMT_FLAG_PLANAR))) |
ff_add_format(&formats, fmt); |
} |
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ff_set_common_formats(ctx, formats); |
return 0; |
} |
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static av_cold void uninit(AVFilterContext *ctx) |
{ |
CropContext *s = ctx->priv; |
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av_expr_free(s->x_pexpr); |
s->x_pexpr = NULL; |
av_expr_free(s->y_pexpr); |
s->y_pexpr = NULL; |
} |
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static inline int normalize_double(int *n, double d) |
{ |
int ret = 0; |
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if (isnan(d)) { |
ret = AVERROR(EINVAL); |
} else if (d > INT_MAX || d < INT_MIN) { |
*n = d > INT_MAX ? INT_MAX : INT_MIN; |
ret = AVERROR(EINVAL); |
} else |
*n = round(d); |
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return ret; |
} |
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static int config_input(AVFilterLink *link) |
{ |
AVFilterContext *ctx = link->dst; |
CropContext *s = ctx->priv; |
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(link->format); |
int ret; |
const char *expr; |
double res; |
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s->var_values[VAR_IN_W] = s->var_values[VAR_IW] = ctx->inputs[0]->w; |
s->var_values[VAR_IN_H] = s->var_values[VAR_IH] = ctx->inputs[0]->h; |
s->var_values[VAR_A] = (float) link->w / link->h; |
s->var_values[VAR_SAR] = link->sample_aspect_ratio.num ? av_q2d(link->sample_aspect_ratio) : 1; |
s->var_values[VAR_DAR] = s->var_values[VAR_A] * s->var_values[VAR_SAR]; |
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_OUT_W] = s->var_values[VAR_OW] = NAN; |
s->var_values[VAR_OUT_H] = s->var_values[VAR_OH] = NAN; |
s->var_values[VAR_N] = 0; |
s->var_values[VAR_T] = NAN; |
s->var_values[VAR_POS] = NAN; |
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av_image_fill_max_pixsteps(s->max_step, NULL, pix_desc); |
s->hsub = pix_desc->log2_chroma_w; |
s->vsub = pix_desc->log2_chroma_h; |
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if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr), |
var_names, s->var_values, |
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
goto fail_expr; |
s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = res; |
if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr), |
var_names, s->var_values, |
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
goto fail_expr; |
s->var_values[VAR_OUT_H] = s->var_values[VAR_OH] = res; |
/* evaluate again ow as it may depend on oh */ |
if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr), |
var_names, s->var_values, |
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
goto fail_expr; |
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s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = res; |
if (normalize_double(&s->w, s->var_values[VAR_OUT_W]) < 0 || |
normalize_double(&s->h, s->var_values[VAR_OUT_H]) < 0) { |
av_log(ctx, AV_LOG_ERROR, |
"Too big value or invalid expression for out_w/ow or out_h/oh. " |
"Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n", |
s->w_expr, s->h_expr); |
return AVERROR(EINVAL); |
} |
s->w &= ~((1 << s->hsub) - 1); |
s->h &= ~((1 << s->vsub) - 1); |
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av_expr_free(s->x_pexpr); |
av_expr_free(s->y_pexpr); |
s->x_pexpr = s->y_pexpr = NULL; |
if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names, |
NULL, NULL, NULL, NULL, 0, ctx)) < 0 || |
(ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names, |
NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
return AVERROR(EINVAL); |
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if (s->keep_aspect) { |
AVRational dar = av_mul_q(link->sample_aspect_ratio, |
(AVRational){ link->w, link->h }); |
av_reduce(&s->out_sar.num, &s->out_sar.den, |
dar.num * s->h, dar.den * s->w, INT_MAX); |
} else |
s->out_sar = link->sample_aspect_ratio; |
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av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d sar:%d/%d -> w:%d h:%d sar:%d/%d\n", |
link->w, link->h, link->sample_aspect_ratio.num, link->sample_aspect_ratio.den, |
s->w, s->h, s->out_sar.num, s->out_sar.den); |
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if (s->w <= 0 || s->h <= 0 || |
s->w > link->w || s->h > link->h) { |
av_log(ctx, AV_LOG_ERROR, |
"Invalid too big or non positive size for width '%d' or height '%d'\n", |
s->w, s->h); |
return AVERROR(EINVAL); |
} |
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/* set default, required in the case the first computed value for x/y is NAN */ |
s->x = (link->w - s->w) / 2; |
s->y = (link->h - s->h) / 2; |
s->x &= ~((1 << s->hsub) - 1); |
s->y &= ~((1 << s->vsub) - 1); |
return 0; |
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fail_expr: |
av_log(NULL, AV_LOG_ERROR, "Error when evaluating the expression '%s'\n", expr); |
return ret; |
} |
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static int config_output(AVFilterLink *link) |
{ |
CropContext *s = link->src->priv; |
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link->w = s->w; |
link->h = s->h; |
link->sample_aspect_ratio = s->out_sar; |
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return 0; |
} |
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static int filter_frame(AVFilterLink *link, AVFrame *frame) |
{ |
AVFilterContext *ctx = link->dst; |
CropContext *s = ctx->priv; |
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format); |
int i; |
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frame->width = s->w; |
frame->height = s->h; |
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s->var_values[VAR_N] = link->frame_count; |
s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ? |
NAN : frame->pts * av_q2d(link->time_base); |
s->var_values[VAR_POS] = av_frame_get_pkt_pos(frame) == -1 ? |
NAN : av_frame_get_pkt_pos(frame); |
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); |
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normalize_double(&s->x, s->var_values[VAR_X]); |
normalize_double(&s->y, s->var_values[VAR_Y]); |
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if (s->x < 0) |
s->x = 0; |
if (s->y < 0) |
s->y = 0; |
if ((unsigned)s->x + (unsigned)s->w > link->w) |
s->x = link->w - s->w; |
if ((unsigned)s->y + (unsigned)s->h > link->h) |
s->y = link->h - s->h; |
s->x &= ~((1 << s->hsub) - 1); |
s->y &= ~((1 << s->vsub) - 1); |
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av_dlog(ctx, "n:%d t:%f pos:%f x:%d y:%d x+w:%d y+h:%d\n", |
(int)s->var_values[VAR_N], s->var_values[VAR_T], s->var_values[VAR_POS], |
s->x, s->y, s->x+s->w, s->y+s->h); |
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frame->data[0] += s->y * frame->linesize[0]; |
frame->data[0] += s->x * s->max_step[0]; |
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if (!(desc->flags & AV_PIX_FMT_FLAG_PAL || desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)) { |
for (i = 1; i < 3; i ++) { |
if (frame->data[i]) { |
frame->data[i] += (s->y >> s->vsub) * frame->linesize[i]; |
frame->data[i] += (s->x * s->max_step[i]) >> s->hsub; |
} |
} |
} |
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/* alpha plane */ |
if (frame->data[3]) { |
frame->data[3] += s->y * frame->linesize[3]; |
frame->data[3] += s->x * s->max_step[3]; |
} |
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return ff_filter_frame(link->dst->outputs[0], frame); |
} |
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#define OFFSET(x) offsetof(CropContext, x) |
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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static const AVOption crop_options[] = { |
{ "out_w", "set the width crop area expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
{ "w", "set the width crop area expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
{ "out_h", "set the height crop area expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
{ "h", "set the height crop area expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
{ "x", "set the x crop area expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "(in_w-out_w)/2"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
{ "y", "set the y crop area expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "(in_h-out_h)/2"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
{ "keep_aspect", "keep aspect ratio", OFFSET(keep_aspect), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS }, |
{ NULL } |
}; |
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AVFILTER_DEFINE_CLASS(crop); |
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static const AVFilterPad avfilter_vf_crop_inputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
.filter_frame = filter_frame, |
.config_props = config_input, |
}, |
{ NULL } |
}; |
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static const AVFilterPad avfilter_vf_crop_outputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
.config_props = config_output, |
}, |
{ NULL } |
}; |
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AVFilter avfilter_vf_crop = { |
.name = "crop", |
.description = NULL_IF_CONFIG_SMALL("Crop the input video."), |
.priv_size = sizeof(CropContext), |
.priv_class = &crop_class, |
.query_formats = query_formats, |
.uninit = uninit, |
.inputs = avfilter_vf_crop_inputs, |
.outputs = avfilter_vf_crop_outputs, |
}; |