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_init_packet(&pkt);

38 av_register_all();

40 iformat = av_find_input_format("image2");

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

42 av_log(log_ctx, AV_LOG_ERROR,

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

44 return ret;

45 }

47 if ((ret = avformat_find_stream_info(format_ctx, NULL)) < 0) {

48 av_log(log_ctx, AV_LOG_ERROR, "Find stream info failed\n");

49 return ret;

50 }

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

53 codec = avcodec_find_decoder(codec_ctx->codec_id);

54 if (!codec) {

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

56 ret = AVERROR(EINVAL);

57 goto end;

58 }

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

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

62 goto end;

63 }

65 if (!(frame = av_frame_alloc()) ) {

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

67 ret = AVERROR(ENOMEM);

68 goto end;

69 }

71 ret = av_read_frame(format_ctx, &pkt);

72 if (ret < 0) {

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

74 goto end;

75 }

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

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

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

80 if (ret >= 0)

81 ret = -1;

82 goto end;

83 }

85 *w = frame->width;

86 *h = frame->height;

87 *pix_fmt = frame->format;

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

90 goto end;

91 ret = 0;

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

95 end:

96 av_free_packet(&pkt);

97 avcodec_close(codec_ctx);

98 avformat_close_input(&format_ctx);

99 av_frame_free(&frame);

100

101 if (ret < 0)

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

103 return ret;

104 }

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