text: /*
   * Copyright 2012 Stefano Sabatini <stefasab gmail com>
   *
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #include "libavutil/imgutils.h"
  #include "lavfutils.h"
  
  int ff_load_image(uint8_t *data[4], int linesize[4],
                    int *w, int *h, enum AVPixelFormat *pix_fmt,
                    const char *filename, void *log_ctx)
  {
      AVInputFormat *iformat = NULL;
      AVFormatContext *format_ctx = NULL;
      AVCodec *codec;
      AVCodecContext *codec_ctx;
      AVFrame *frame;
      int frame_decoded, ret = 0;
      AVPacket pkt;
      AVDictionary *opt=NULL;
  
      av_init_packet(&pkt);
  
      av_register_all();
  
      iformat = av_find_input_format("image2pipe");
      if ((ret = avformat_open_input(&format_ctx, filename, iformat, NULL)) < 0) {
          av_log(log_ctx, AV_LOG_ERROR,
                 "Failed to open input file '%s'\n", filename);
          return ret;
      }
  
      if ((ret = avformat_find_stream_info(format_ctx, NULL)) < 0) {
          av_log(log_ctx, AV_LOG_ERROR, "Find stream info failed\n");
          return ret;
      }
  
      codec_ctx = format_ctx->streams[0]->codec;
      codec = avcodec_find_decoder(codec_ctx->codec_id);
      if (!codec) {
          av_log(log_ctx, AV_LOG_ERROR, "Failed to find codec\n");
          ret = AVERROR(EINVAL);
          goto end;
      }
  
      av_dict_set(&opt, "thread_type", "slice", 0);
      if ((ret = avcodec_open2(codec_ctx, codec, &opt)) < 0) {
          av_log(log_ctx, AV_LOG_ERROR, "Failed to open codec\n");
          goto end;
      }
  
      if (!(frame = av_frame_alloc()) ) {
          av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc frame\n");
          ret = AVERROR(ENOMEM);
          goto end;
      }
  
      ret = av_read_frame(format_ctx, &pkt);
      if (ret < 0) {
          av_log(log_ctx, AV_LOG_ERROR, "Failed to read frame from file\n");
          goto end;
      }
  
      ret = avcodec_decode_video2(codec_ctx, frame, &frame_decoded, &pkt);
      if (ret < 0 || !frame_decoded) {
          av_log(log_ctx, AV_LOG_ERROR, "Failed to decode image from file\n");
          if (ret >= 0)
              ret = -1;
          goto end;
      }
  
      *w       = frame->width;
      *h       = frame->height;
      *pix_fmt = frame->format;
  
      if ((ret = av_image_alloc(data, linesize, *w, *h, *pix_fmt, 16)) < 0)
          goto end;
      ret = 0;
  
      av_image_copy(data, linesize, (const uint8_t **)frame->data, frame->linesize, *pix_fmt, *w, *h);
  
  end:
      av_packet_unref(&pkt);
      avcodec_close(codec_ctx);
      avformat_close_input(&format_ctx);
      av_frame_free(&frame);
      av_dict_free(&opt);
  
      if (ret < 0)
          av_log(log_ctx, AV_LOG_ERROR, "Error loading image file '%s'\n", filename);
      return ret;
  }
  