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