FFmpeg: libavfilter/lavfutils.c Source File

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libavfilter

lavfutils.c

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1 /*

3 *

4 * This file is part of FFmpeg.

5 *

6 * FFmpeg is free software; you can redistribute it and/or

7 * modify it under the terms of the GNU Lesser General Public

8 * License as published by the Free Software Foundation; either

9 * version 2.1 of the License, or (at your option) any later version.

10 *

11 * FFmpeg is distributed in the hope that it will be useful,

12 * but WITHOUT ANY WARRANTY; without even the implied warranty of

13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

14 * Lesser General Public License for more details.

15 *

16 * You should have received a copy of the GNU Lesser General Public

17 * License along with FFmpeg; if not, write to the Free Software

18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

19 */

21 #include "libavutil/imgutils.h"

22 #include "lavfutils.h"

24 int ff_load_image(uint8_t *data[4], int linesize[4],

25 int *w, int *h, enum AVPixelFormat *pix_fmt,

26 const char *filename, void *log_ctx)

27 {

28 AVInputFormat *iformat = NULL;

29 AVFormatContext *format_ctx = NULL;

30 AVCodec *codec;

31 AVCodecContext *codec_ctx;

32 AVFrame *frame;

33 int frame_decoded, ret = 0;

34 AVPacket pkt;

36 av_register_all();

38 iformat = av_find_input_format("image2");

39 if ((ret = avformat_open_input(&format_ctx, filename, iformat, NULL)) < 0) {

40 av_log(log_ctx, AV_LOG_ERROR,

41 "Failed to open input file '%s'\n", filename);

42 return ret;

43 }

45 codec_ctx = format_ctx->streams[0]->codec;

46 codec = avcodec_find_decoder(codec_ctx->codec_id);

47 if (!codec) {

48 av_log(log_ctx, AV_LOG_ERROR, "Failed to find codec\n");

49 ret = AVERROR(EINVAL);

50 goto end;

51 }

53 if ((ret = avcodec_open2(codec_ctx, codec, NULL)) < 0) {

54 av_log(log_ctx, AV_LOG_ERROR, "Failed to open codec\n");

55 goto end;

56 }

58 if (!(frame = avcodec_alloc_frame()) ) {

59 av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc frame\n");

60 ret = AVERROR(ENOMEM);

61 goto end;

62 }

64 ret = av_read_frame(format_ctx, &pkt);

65 if (ret < 0) {

66 av_log(log_ctx, AV_LOG_ERROR, "Failed to read frame from file\n");

67 goto end;

68 }

70 ret = avcodec_decode_video2(codec_ctx, frame, &frame_decoded, &pkt);

71 if (ret < 0 || !frame_decoded) {

72 av_log(log_ctx, AV_LOG_ERROR, "Failed to decode image from file\n");

73 goto end;

74 }

75 ret = 0;

77 *w = frame->width;

78 *h = frame->height;

79 *pix_fmt = frame->format;

81 if ((ret = av_image_alloc(data, linesize, *w, *h, *pix_fmt, 16)) < 0)

82 goto end;

83 ret = 0;

85 av_image_copy(data, linesize, (const uint8_t **)frame->data, frame->linesize, *pix_fmt, *w, *h);

87 end:

88 avcodec_close(codec_ctx);

89 avformat_close_input(&format_ctx);

90 av_freep(&frame);

92 if (ret < 0)

93 av_log(log_ctx, AV_LOG_ERROR, "Error loading image file '%s'\n", filename);

94 return ret;

95 }

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