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
ff_load_image(uint8_t * data[4],int linesize[4],int * w,int * h,enum AVPixelFormat * pix_fmt,const char * filename,void * log_ctx)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 AVCodecParameters *par;
33 AVFrame *frame;
34 int frame_decoded, ret = 0;
35 AVPacket pkt;
36 AVDictionary *opt=NULL;
37
38 av_init_packet(&pkt);
39
40 iformat = av_find_input_format("image2pipe");
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 par = format_ctx->streams[0]->codecpar;
53 codec = avcodec_find_decoder(par->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 codec_ctx = avcodec_alloc_context3(codec);
61 if (!codec_ctx) {
62 av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc video decoder context\n");
63 ret = AVERROR(ENOMEM);
64 goto end;
65 }
66
67 ret = avcodec_parameters_to_context(codec_ctx, par);
68 if (ret < 0) {
69 av_log(log_ctx, AV_LOG_ERROR, "Failed to copy codec parameters to decoder context\n");
70 goto end;
71 }
72
73 av_dict_set(&opt, "thread_type", "slice", 0);
74 if ((ret = avcodec_open2(codec_ctx, codec, &opt)) < 0) {
75 av_log(log_ctx, AV_LOG_ERROR, "Failed to open codec\n");
76 goto end;
77 }
78
79 if (!(frame = av_frame_alloc()) ) {
80 av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc frame\n");
81 ret = AVERROR(ENOMEM);
82 goto end;
83 }
84
85 ret = av_read_frame(format_ctx, &pkt);
86 if (ret < 0) {
87 av_log(log_ctx, AV_LOG_ERROR, "Failed to read frame from file\n");
88 goto end;
89 }
90
91 ret = avcodec_decode_video2(codec_ctx, frame, &frame_decoded, &pkt);
92 if (ret < 0 || !frame_decoded) {
93 av_log(log_ctx, AV_LOG_ERROR, "Failed to decode image from file\n");
94 if (ret >= 0)
95 ret = -1;
96 goto end;
97 }
98
99 *w = frame->width;
100 *h = frame->height;
101 *pix_fmt = frame->format;
102
103 if ((ret = av_image_alloc(data, linesize, *w, *h, *pix_fmt, 16)) < 0)
104 goto end;
105 ret = 0;
106
107 av_image_copy(data, linesize, (const uint8_t **)frame->data, frame->linesize, *pix_fmt, *w, *h);
108
109 end:
110 av_packet_unref(&pkt);
111 avcodec_free_context(&codec_ctx);
112 avformat_close_input(&format_ctx);
113 av_frame_free(&frame);
114 av_dict_free(&opt);
115
116 if (ret < 0)
117 av_log(log_ctx, AV_LOG_ERROR, "Error loading image file '%s'\n", filename);
118 return ret;
119 }
120