mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-12 19:18:44 +02:00
412 lines
14 KiB
C
412 lines
14 KiB
C
/*
|
|
* 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
|
|
* video crop filter
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
|
|
#include "avfilter.h"
|
|
#include "filters.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"
|
|
|
|
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
|
|
#if FF_API_FRAME_PKT
|
|
"pos", ///< position in the file
|
|
#endif
|
|
"t", ///< timestamp expressed in seconds
|
|
NULL
|
|
};
|
|
|
|
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,
|
|
#if FF_API_FRAME_PKT
|
|
VAR_POS,
|
|
#endif
|
|
VAR_T,
|
|
VAR_VARS_NB
|
|
};
|
|
|
|
typedef struct CropContext {
|
|
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
|
|
|
|
AVRational out_sar; ///< output sample aspect ratio
|
|
int keep_aspect; ///< keep display aspect ratio when cropping
|
|
int exact; ///< exact cropping, for subsampled formats
|
|
|
|
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;
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
int reject_flags = AV_PIX_FMT_FLAG_BITSTREAM | FF_PIX_FMT_FLAG_SW_FLAT_SUB;
|
|
|
|
return ff_set_common_formats(ctx, ff_formats_pixdesc_filter(0, reject_flags));
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
CropContext *s = ctx->priv;
|
|
|
|
av_expr_free(s->x_pexpr);
|
|
s->x_pexpr = NULL;
|
|
av_expr_free(s->y_pexpr);
|
|
s->y_pexpr = NULL;
|
|
}
|
|
|
|
static inline int normalize_double(int *n, double d)
|
|
{
|
|
int ret = 0;
|
|
|
|
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 = lrint(d);
|
|
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
|
|
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;
|
|
#if FF_API_FRAME_PKT
|
|
s->var_values[VAR_POS] = NAN;
|
|
#endif
|
|
|
|
av_image_fill_max_pixsteps(s->max_step, NULL, pix_desc);
|
|
|
|
if (pix_desc->flags & AV_PIX_FMT_FLAG_HWACCEL) {
|
|
s->hsub = 1;
|
|
s->vsub = 1;
|
|
} else {
|
|
s->hsub = pix_desc->log2_chroma_w;
|
|
s->vsub = pix_desc->log2_chroma_h;
|
|
}
|
|
|
|
av_expr_parse_and_eval(&res, (expr = s->w_expr),
|
|
var_names, s->var_values,
|
|
NULL, NULL, NULL, NULL, NULL, 0, ctx);
|
|
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;
|
|
|
|
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);
|
|
}
|
|
|
|
if (!s->exact) {
|
|
s->w &= ~((1 << s->hsub) - 1);
|
|
s->h &= ~((1 << s->vsub) - 1);
|
|
}
|
|
|
|
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);
|
|
|
|
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,
|
|
(int64_t)dar.num * s->h, (int64_t)dar.den * s->w, INT_MAX);
|
|
} else
|
|
s->out_sar = link->sample_aspect_ratio;
|
|
|
|
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);
|
|
|
|
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);
|
|
}
|
|
|
|
/* 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;
|
|
if (!s->exact) {
|
|
s->x &= ~((1 << s->hsub) - 1);
|
|
s->y &= ~((1 << s->vsub) - 1);
|
|
}
|
|
return 0;
|
|
|
|
fail_expr:
|
|
av_log(ctx, AV_LOG_ERROR, "Error when evaluating the expression '%s'\n", expr);
|
|
return ret;
|
|
}
|
|
|
|
static int config_output(AVFilterLink *link)
|
|
{
|
|
CropContext *s = link->src->priv;
|
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
|
|
|
|
if (desc->flags & AV_PIX_FMT_FLAG_HWACCEL) {
|
|
// Hardware frames adjust the cropping regions rather than
|
|
// changing the frame size.
|
|
} else {
|
|
link->w = s->w;
|
|
link->h = s->h;
|
|
}
|
|
link->sample_aspect_ratio = s->out_sar;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *link, AVFrame *frame)
|
|
{
|
|
FilterLink *l = ff_filter_link(link);
|
|
AVFilterContext *ctx = link->dst;
|
|
CropContext *s = ctx->priv;
|
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
|
|
int i;
|
|
|
|
s->var_values[VAR_N] = l->frame_count_out;
|
|
s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
|
|
NAN : frame->pts * av_q2d(link->time_base);
|
|
#if FF_API_FRAME_PKT
|
|
FF_DISABLE_DEPRECATION_WARNINGS
|
|
s->var_values[VAR_POS] = frame->pkt_pos == -1 ?
|
|
NAN : frame->pkt_pos;
|
|
FF_ENABLE_DEPRECATION_WARNINGS
|
|
#endif
|
|
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);
|
|
/* It is necessary if x is expressed from y */
|
|
s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
|
|
|
|
normalize_double(&s->x, s->var_values[VAR_X]);
|
|
normalize_double(&s->y, s->var_values[VAR_Y]);
|
|
|
|
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;
|
|
if (!s->exact) {
|
|
s->x &= ~((1 << s->hsub) - 1);
|
|
s->y &= ~((1 << s->vsub) - 1);
|
|
}
|
|
|
|
av_log(ctx, AV_LOG_TRACE, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
|
|
(int)s->var_values[VAR_N], s->var_values[VAR_T],
|
|
s->x, s->y, s->x+s->w, s->y+s->h);
|
|
|
|
if (desc->flags & AV_PIX_FMT_FLAG_HWACCEL) {
|
|
frame->crop_top += s->y;
|
|
frame->crop_left += s->x;
|
|
frame->crop_bottom = frame->height - frame->crop_top - frame->crop_bottom - s->h;
|
|
frame->crop_right = frame->width - frame->crop_left - frame->crop_right - s->w;
|
|
} else {
|
|
frame->width = s->w;
|
|
frame->height = s->h;
|
|
|
|
frame->data[0] += s->y * frame->linesize[0];
|
|
frame->data[0] += s->x * s->max_step[0];
|
|
|
|
if (!(desc->flags & AV_PIX_FMT_FLAG_PAL)) {
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* alpha plane */
|
|
if (frame->data[3]) {
|
|
frame->data[3] += s->y * frame->linesize[3];
|
|
frame->data[3] += s->x * s->max_step[3];
|
|
}
|
|
}
|
|
|
|
return ff_filter_frame(link->dst->outputs[0], frame);
|
|
}
|
|
|
|
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
|
|
char *res, int res_len, int flags)
|
|
{
|
|
CropContext *s = ctx->priv;
|
|
int ret;
|
|
|
|
if ( !strcmp(cmd, "out_w") || !strcmp(cmd, "w")
|
|
|| !strcmp(cmd, "out_h") || !strcmp(cmd, "h")
|
|
|| !strcmp(cmd, "x") || !strcmp(cmd, "y")) {
|
|
|
|
int old_x = s->x;
|
|
int old_y = s->y;
|
|
int old_w = s->w;
|
|
int old_h = s->h;
|
|
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
AVFilterLink *inlink = ctx->inputs[0];
|
|
|
|
av_opt_set(s, cmd, args, 0);
|
|
|
|
if ((ret = config_input(inlink)) < 0) {
|
|
s->x = old_x;
|
|
s->y = old_y;
|
|
s->w = old_w;
|
|
s->h = old_h;
|
|
return ret;
|
|
}
|
|
|
|
ret = config_output(outlink);
|
|
|
|
} else
|
|
ret = AVERROR(ENOSYS);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(CropContext, x)
|
|
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
|
|
#define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
|
|
|
|
static const AVOption crop_options[] = {
|
|
{ "out_w", "set the width crop area expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, TFLAGS },
|
|
{ "w", "set the width crop area expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, TFLAGS },
|
|
{ "out_h", "set the height crop area expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, TFLAGS },
|
|
{ "h", "set the height crop area expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, TFLAGS },
|
|
{ "x", "set the x crop area expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "(in_w-out_w)/2"}, 0, 0, TFLAGS },
|
|
{ "y", "set the y crop area expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "(in_h-out_h)/2"}, 0, 0, TFLAGS },
|
|
{ "keep_aspect", "keep aspect ratio", OFFSET(keep_aspect), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
|
|
{ "exact", "do exact cropping", OFFSET(exact), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
|
|
{ NULL }
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(crop);
|
|
|
|
static const AVFilterPad avfilter_vf_crop_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.filter_frame = filter_frame,
|
|
.config_props = config_input,
|
|
},
|
|
};
|
|
|
|
static const AVFilterPad avfilter_vf_crop_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_output,
|
|
},
|
|
};
|
|
|
|
const AVFilter ff_vf_crop = {
|
|
.name = "crop",
|
|
.description = NULL_IF_CONFIG_SMALL("Crop the input video."),
|
|
.priv_size = sizeof(CropContext),
|
|
.priv_class = &crop_class,
|
|
.uninit = uninit,
|
|
FILTER_INPUTS(avfilter_vf_crop_inputs),
|
|
FILTER_OUTPUTS(avfilter_vf_crop_outputs),
|
|
FILTER_QUERY_FUNC(query_formats),
|
|
.process_command = process_command,
|
|
};
|