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lswsutils.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "libavutil/imgutils.h"
20 #include "lswsutils.h"
21 
22 int ff_scale_image(uint8_t *dst_data[4], int dst_linesize[4],
23  int dst_w, int dst_h, enum AVPixelFormat dst_pix_fmt,
24  uint8_t * const src_data[4], int src_linesize[4],
25  int src_w, int src_h, enum AVPixelFormat src_pix_fmt,
26  void *log_ctx)
27 {
28  int ret;
29  struct SwsContext *sws_ctx = sws_getContext(src_w, src_h, src_pix_fmt,
30  dst_w, dst_h, dst_pix_fmt,
31  0, NULL, NULL, NULL);
32  if (!sws_ctx) {
33  av_log(log_ctx, AV_LOG_ERROR,
34  "Impossible to create scale context for the conversion "
35  "fmt:%s s:%dx%d -> fmt:%s s:%dx%d\n",
36  av_get_pix_fmt_name(src_pix_fmt), src_w, src_h,
37  av_get_pix_fmt_name(dst_pix_fmt), dst_w, dst_h);
38  ret = AVERROR(EINVAL);
39  goto end;
40  }
41 
42  if ((ret = av_image_alloc(dst_data, dst_linesize, dst_w, dst_h, dst_pix_fmt, 16)) < 0)
43  goto end;
44  ret = 0;
45  sws_scale(sws_ctx, (const uint8_t * const*)src_data, src_linesize, 0, src_h, dst_data, dst_linesize);
46 
47 end:
48  sws_freeContext(sws_ctx);
49  return ret;
50 }
#define NULL
Definition: coverity.c:32
misc image utilities
int av_image_alloc(uint8_t *pointers[4], int linesizes[4], int w, int h, enum AVPixelFormat pix_fmt, int align)
Allocate an image with size w and h and pixel format pix_fmt, and fill pointers and linesizes accordi...
Definition: imgutils.c:192
Miscellaneous utilities which make use of the libswscale library.
uint8_t
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:67
int ff_scale_image(uint8_t *dst_data[4], int dst_linesize[4], int dst_w, int dst_h, enum AVPixelFormat dst_pix_fmt, uint8_t *const src_data[4], int src_linesize[4], int src_w, int src_h, enum AVPixelFormat src_pix_fmt, void *log_ctx)
Scale image using libswscale.
Definition: lswsutils.c:22
struct SwsContext * sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat, int dstW, int dstH, enum AVPixelFormat dstFormat, int flags, SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)
Allocate and return an SwsContext.
Definition: utils.c:1634
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
ret
Definition: avfilter.c:974
void sws_freeContext(struct SwsContext *swsContext)
Free the swscaler context swsContext.
Definition: utils.c:2031
int attribute_align_arg sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[])
swscale wrapper, so we don't need to export the SwsContext.
Definition: swscale.c:914
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:2011
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61