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lavfutils.c
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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 
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;
35 
37 
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  }
44 
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  }
52 
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  }
57 
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  }
63 
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  }
69 
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;
76 
77  *w = frame->width;
78  *h = frame->height;
79  *pix_fmt = frame->format;
80 
81  if ((ret = av_image_alloc(data, linesize, *w, *h, *pix_fmt, 16)) < 0)
82  goto end;
83  ret = 0;
84 
85  av_image_copy(data, linesize, (const uint8_t **)frame->data, frame->linesize, *pix_fmt, *w, *h);
86 
87 end:
88  avcodec_close(codec_ctx);
89  avformat_close_input(&format_ctx);
90  av_freep(&frame);
91 
92  if (ret < 0)
93  av_log(log_ctx, AV_LOG_ERROR, "Error loading image file '%s'\n", filename);
94  return ret;
95 }