1/*
2 * Copyright 2012 Stefano Sabatini <stefasab gmail com>
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 */
20
21#include "libavutil/imgutils.h"
22#include "lavfutils.h"
23
24int 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;
35
36    av_init_packet(&pkt);
37
38    av_register_all();
39
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    }
46
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    }
51
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    }
59
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    }
64
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    }
70
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    }
76
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        goto end;
81    }
82    ret = 0;
83
84    *w       = frame->width;
85    *h       = frame->height;
86    *pix_fmt = frame->format;
87
88    if ((ret = av_image_alloc(data, linesize, *w, *h, *pix_fmt, 16)) < 0)
89        goto end;
90    ret = 0;
91
92    av_image_copy(data, linesize, (const uint8_t **)frame->data, frame->linesize, *pix_fmt, *w, *h);
93
94end:
95    av_free_packet(&pkt);
96    avcodec_close(codec_ctx);
97    avformat_close_input(&format_ctx);
98    av_freep(&frame);
99
100    if (ret < 0)
101        av_log(log_ctx, AV_LOG_ERROR, "Error loading image file '%s'\n", filename);
102    return ret;
103}
104