aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/lavfutils.c
blob: ce0466d1a3c02888634f069550039f4fa6d96c81 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
/*
 * Copyright 2012 Stefano Sabatini <stefasab gmail com>
 *
 * 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
 */

#include "libavutil/imgutils.h"
#include "lavfutils.h"

int ff_load_image(uint8_t *data[4], int linesize[4],
                  int *w, int *h, enum PixelFormat *pix_fmt,
                  const char *filename, void *log_ctx)
{
    AVInputFormat *iformat = NULL;
    AVFormatContext *format_ctx = NULL;
    AVCodec *codec;
    AVCodecContext *codec_ctx;
    AVFrame *frame;
    int frame_decoded, ret = 0;
    AVPacket pkt;

    av_register_all();

    iformat = av_find_input_format("image2");
    if ((ret = avformat_open_input(&format_ctx, filename, iformat, NULL)) < 0) {
        av_log(log_ctx, AV_LOG_ERROR,
               "Failed to open input file '%s'\n", filename);
        return ret;
    }

    codec_ctx = format_ctx->streams[0]->codec;
    codec = avcodec_find_decoder(codec_ctx->codec_id);
    if (!codec) {
        av_log(log_ctx, AV_LOG_ERROR, "Failed to find codec\n");
        ret = AVERROR(EINVAL);
        goto end;
    }

    if ((ret = avcodec_open2(codec_ctx, codec, NULL)) < 0) {
        av_log(log_ctx, AV_LOG_ERROR, "Failed to open codec\n");
        goto end;
    }

    if (!(frame = avcodec_alloc_frame()) ) {
        av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc frame\n");
        ret = AVERROR(ENOMEM);
        goto end;
    }

    ret = av_read_frame(format_ctx, &pkt);
    if (ret < 0) {
        av_log(log_ctx, AV_LOG_ERROR, "Failed to read frame from file\n");
        goto end;
    }

    ret = avcodec_decode_video2(codec_ctx, frame, &frame_decoded, &pkt);
    if (ret < 0 || !frame_decoded) {
        av_log(log_ctx, AV_LOG_ERROR, "Failed to decode image from file\n");
        goto end;
    }
    ret = 0;

    *w       = frame->width;
    *h       = frame->height;
    *pix_fmt = frame->format;

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

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

end:
    if (codec_ctx)
        avcodec_close(codec_ctx);
    if (format_ctx)
        avformat_close_input(&format_ctx);
    av_freep(&frame);

    if (ret < 0)
        av_log(log_ctx, AV_LOG_ERROR, "Error loading image file '%s'\n", filename);
    return ret;
}