FFmpeg: libavfilter/lswsutils.c Source File

lswsutils.c

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  SWS_BILINEAR, 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 }