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 "libavformat/avformat.h"
23 #include "lavfutils.h"
24
ff_load_image(uint8_t * data[4],int linesize[4],int * w,int * h,enum AVPixelFormat * pix_fmt,const char * filename,void * log_ctx)25 int ff_load_image(uint8_t *data[4], int linesize[4],
26 int *w, int *h, enum AVPixelFormat *pix_fmt,
27 const char *filename, void *log_ctx)
28 {
29 AVInputFormat *iformat = NULL;
30 AVFormatContext *format_ctx = NULL;
31 const AVCodec *codec;
32 AVCodecContext *codec_ctx = NULL;
33 AVCodecParameters *par;
34 AVFrame *frame = NULL;
35 int ret = 0;
36 AVPacket pkt;
37 AVDictionary *opt=NULL;
38
39 iformat = av_find_input_format("image2pipe");
40 if ((ret = avformat_open_input(&format_ctx, filename, iformat, NULL)) < 0) {
41 av_log(log_ctx, AV_LOG_ERROR,
42 "Failed to open input file '%s'\n", filename);
43 return ret;
44 }
45
46 if ((ret = avformat_find_stream_info(format_ctx, NULL)) < 0) {
47 av_log(log_ctx, AV_LOG_ERROR, "Find stream info failed\n");
48 goto end;
49 }
50
51 par = format_ctx->streams[0]->codecpar;
52 codec = avcodec_find_decoder(par->codec_id);
53 if (!codec) {
54 av_log(log_ctx, AV_LOG_ERROR, "Failed to find codec\n");
55 ret = AVERROR(EINVAL);
56 goto end;
57 }
58
59 codec_ctx = avcodec_alloc_context3(codec);
60 if (!codec_ctx) {
61 av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc video decoder context\n");
62 ret = AVERROR(ENOMEM);
63 goto end;
64 }
65
66 ret = avcodec_parameters_to_context(codec_ctx, par);
67 if (ret < 0) {
68 av_log(log_ctx, AV_LOG_ERROR, "Failed to copy codec parameters to decoder context\n");
69 goto end;
70 }
71
72 av_dict_set(&opt, "thread_type", "slice", 0);
73 if ((ret = avcodec_open2(codec_ctx, codec, &opt)) < 0) {
74 av_log(log_ctx, AV_LOG_ERROR, "Failed to open codec\n");
75 goto end;
76 }
77
78 if (!(frame = av_frame_alloc()) ) {
79 av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc frame\n");
80 ret = AVERROR(ENOMEM);
81 goto end;
82 }
83
84 ret = av_read_frame(format_ctx, &pkt);
85 if (ret < 0) {
86 av_log(log_ctx, AV_LOG_ERROR, "Failed to read frame from file\n");
87 goto end;
88 }
89
90 ret = avcodec_send_packet(codec_ctx, &pkt);
91 av_packet_unref(&pkt);
92 if (ret < 0) {
93 av_log(log_ctx, AV_LOG_ERROR, "Error submitting a packet to decoder\n");
94 goto end;
95 }
96
97 ret = avcodec_receive_frame(codec_ctx, frame);
98 if (ret < 0) {
99 av_log(log_ctx, AV_LOG_ERROR, "Failed to decode image from file\n");
100 goto end;
101 }
102
103 *w = frame->width;
104 *h = frame->height;
105 *pix_fmt = frame->format;
106
107 if ((ret = av_image_alloc(data, linesize, *w, *h, *pix_fmt, 16)) < 0)
108 goto end;
109 ret = 0;
110
111 av_image_copy(data, linesize, (const uint8_t **)frame->data, frame->linesize, *pix_fmt, *w, *h);
112
113 end:
114 avcodec_free_context(&codec_ctx);
115 avformat_close_input(&format_ctx);
116 av_frame_free(&frame);
117 av_dict_free(&opt);
118
119 if (ret < 0)
120 av_log(log_ctx, AV_LOG_ERROR, "Error loading image file '%s'\n", filename);
121 return ret;
122 }
123