mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
ba87f0801d
Passing an explicit filename to this command is only necessary if the documentation in the @file block refers to a file different from the one the block resides in. Originally committed as revision 22921 to svn://svn.ffmpeg.org/ffmpeg/trunk
228 lines
6.9 KiB
C
228 lines
6.9 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 "avfilter.h"
|
|
#include "libavutil/pixdesc.h"
|
|
|
|
typedef struct {
|
|
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
|
|
|
|
int bpp; ///< bits per pixel
|
|
int hsub, vsub; ///< chroma subsampling
|
|
} CropContext;
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
static const enum PixelFormat pix_fmts[] = {
|
|
PIX_FMT_RGB48BE, PIX_FMT_RGB48LE,
|
|
PIX_FMT_ARGB, PIX_FMT_RGBA,
|
|
PIX_FMT_ABGR, PIX_FMT_BGRA,
|
|
PIX_FMT_RGB24, PIX_FMT_BGR24,
|
|
PIX_FMT_RGB565BE, PIX_FMT_RGB565LE,
|
|
PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
|
|
PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
|
|
PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
|
|
PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
|
|
PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
|
|
PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE,
|
|
PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
|
|
PIX_FMT_YUV444P, PIX_FMT_YUV422P,
|
|
PIX_FMT_YUV420P, PIX_FMT_YUV411P,
|
|
PIX_FMT_YUV410P, PIX_FMT_YUV440P,
|
|
PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
|
|
PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
|
|
PIX_FMT_YUVA420P,
|
|
PIX_FMT_RGB8, PIX_FMT_BGR8,
|
|
PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
|
|
PIX_FMT_PAL8, PIX_FMT_GRAY8,
|
|
PIX_FMT_NONE
|
|
};
|
|
|
|
avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
|
|
{
|
|
CropContext *crop = ctx->priv;
|
|
|
|
if (args)
|
|
sscanf(args, "%d:%d:%d:%d", &crop->x, &crop->y, &crop->w, &crop->h);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int config_input(AVFilterLink *link)
|
|
{
|
|
AVFilterContext *ctx = link->dst;
|
|
CropContext *crop = ctx->priv;
|
|
|
|
switch (link->format) {
|
|
case PIX_FMT_RGB48BE:
|
|
case PIX_FMT_RGB48LE:
|
|
crop->bpp = 48;
|
|
break;
|
|
case PIX_FMT_ARGB:
|
|
case PIX_FMT_RGBA:
|
|
case PIX_FMT_ABGR:
|
|
case PIX_FMT_BGRA:
|
|
crop->bpp = 32;
|
|
break;
|
|
case PIX_FMT_RGB24:
|
|
case PIX_FMT_BGR24:
|
|
crop->bpp = 24;
|
|
break;
|
|
case PIX_FMT_RGB565BE:
|
|
case PIX_FMT_RGB565LE:
|
|
case PIX_FMT_RGB555BE:
|
|
case PIX_FMT_RGB555LE:
|
|
case PIX_FMT_BGR565BE:
|
|
case PIX_FMT_BGR565LE:
|
|
case PIX_FMT_BGR555BE:
|
|
case PIX_FMT_BGR555LE:
|
|
case PIX_FMT_GRAY16BE:
|
|
case PIX_FMT_GRAY16LE:
|
|
case PIX_FMT_YUV420P16LE:
|
|
case PIX_FMT_YUV420P16BE:
|
|
case PIX_FMT_YUV422P16LE:
|
|
case PIX_FMT_YUV422P16BE:
|
|
case PIX_FMT_YUV444P16LE:
|
|
case PIX_FMT_YUV444P16BE:
|
|
crop->bpp = 16;
|
|
break;
|
|
default:
|
|
crop->bpp = 8;
|
|
}
|
|
|
|
avcodec_get_chroma_sub_sample(link->format, &crop->hsub, &crop->vsub);
|
|
|
|
if (crop->w == 0)
|
|
crop->w = link->w - crop->x;
|
|
if (crop->h == 0)
|
|
crop->h = link->h - crop->y;
|
|
|
|
crop->x &= ~((1 << crop->hsub) - 1);
|
|
crop->y &= ~((1 << crop->vsub) - 1);
|
|
|
|
av_log(link->dst, AV_LOG_INFO, "x:%d y:%d w:%d h:%d\n",
|
|
crop->x, crop->y, crop->w, crop->h);
|
|
|
|
if (crop->x < 0 || crop->y < 0 ||
|
|
crop->w <= 0 || crop->h <= 0 ||
|
|
(unsigned)crop->x + (unsigned)crop->w > link->w ||
|
|
(unsigned)crop->y + (unsigned)crop->h > link->h) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Output area %d:%d:%d:%d not within the input area 0:0:%d:%d or zero-sized\n",
|
|
crop->x, crop->y, crop->w, crop->h, link->w, link->h);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int config_output(AVFilterLink *link)
|
|
{
|
|
CropContext *crop = link->src->priv;
|
|
|
|
link->w = crop->w;
|
|
link->h = crop->h;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
|
|
{
|
|
CropContext *crop = link->dst->priv;
|
|
AVFilterPicRef *ref2 = avfilter_ref_pic(picref, ~0);
|
|
int i;
|
|
|
|
ref2->w = crop->w;
|
|
ref2->h = crop->h;
|
|
|
|
ref2->data[0] += crop->y * ref2->linesize[0];
|
|
ref2->data[0] += (crop->x * crop->bpp) >> 3;
|
|
|
|
if (!(av_pix_fmt_descriptors[link->format].flags & PIX_FMT_PAL)) {
|
|
for (i = 1; i < 3; i ++) {
|
|
if (ref2->data[i]) {
|
|
ref2->data[i] += (crop->y >> crop->vsub) * ref2->linesize[i];
|
|
ref2->data[i] += ((crop->x * crop->bpp) >> 3) >> crop->hsub;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* alpha plane */
|
|
if (ref2->data[3]) {
|
|
ref2->data[3] += crop->y * ref2->linesize[3];
|
|
ref2->data[3] += (crop->x * crop->bpp) >> 3;
|
|
}
|
|
|
|
avfilter_start_frame(link->dst->outputs[0], ref2);
|
|
}
|
|
|
|
static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
|
|
{
|
|
AVFilterContext *ctx = link->dst;
|
|
CropContext *crop = ctx->priv;
|
|
|
|
if (y >= crop->y + crop->h || y + h <= crop->y)
|
|
return;
|
|
|
|
if (y < crop->y) {
|
|
h -= crop->y - y;
|
|
y = crop->y;
|
|
}
|
|
if (y + h > crop->y + crop->h)
|
|
h = crop->y + crop->h - y;
|
|
|
|
avfilter_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
|
|
}
|
|
|
|
AVFilter avfilter_vf_crop = {
|
|
.name = "crop",
|
|
.description = NULL_IF_CONFIG_SMALL("Crop the input video to x:y:width:height."),
|
|
|
|
.priv_size = sizeof(CropContext),
|
|
|
|
.query_formats = query_formats,
|
|
.init = init,
|
|
|
|
.inputs = (AVFilterPad[]) {{ .name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.start_frame = start_frame,
|
|
.draw_slice = draw_slice,
|
|
.get_video_buffer = avfilter_null_get_video_buffer,
|
|
.config_props = config_input, },
|
|
{ .name = NULL}},
|
|
.outputs = (AVFilterPad[]) {{ .name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_output, },
|
|
{ .name = NULL}},
|
|
};
|