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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.  
  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.     codec_ctx = format_ctx->streams[0]->codec;
  48.     codec = avcodec_find_decoder(codec_ctx->codec_id);
  49.     if (!codec) {
  50.         av_log(log_ctx, AV_LOG_ERROR, "Failed to find codec\n");
  51.         ret = AVERROR(EINVAL);
  52.         goto end;
  53.     }
  54.  
  55.     if ((ret = avcodec_open2(codec_ctx, codec, NULL)) < 0) {
  56.         av_log(log_ctx, AV_LOG_ERROR, "Failed to open codec\n");
  57.         goto end;
  58.     }
  59.  
  60.     if (!(frame = avcodec_alloc_frame()) ) {
  61.         av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc frame\n");
  62.         ret = AVERROR(ENOMEM);
  63.         goto end;
  64.     }
  65.  
  66.     ret = av_read_frame(format_ctx, &pkt);
  67.     if (ret < 0) {
  68.         av_log(log_ctx, AV_LOG_ERROR, "Failed to read frame from file\n");
  69.         goto end;
  70.     }
  71.  
  72.     ret = avcodec_decode_video2(codec_ctx, frame, &frame_decoded, &pkt);
  73.     if (ret < 0 || !frame_decoded) {
  74.         av_log(log_ctx, AV_LOG_ERROR, "Failed to decode image from file\n");
  75.         goto end;
  76.     }
  77.     ret = 0;
  78.  
  79.     *w       = frame->width;
  80.     *h       = frame->height;
  81.     *pix_fmt = frame->format;
  82.  
  83.     if ((ret = av_image_alloc(data, linesize, *w, *h, *pix_fmt, 16)) < 0)
  84.         goto end;
  85.     ret = 0;
  86.  
  87.     av_image_copy(data, linesize, (const uint8_t **)frame->data, frame->linesize, *pix_fmt, *w, *h);
  88.  
  89. end:
  90.     av_free_packet(&pkt);
  91.     avcodec_close(codec_ctx);
  92.     avformat_close_input(&format_ctx);
  93.     av_freep(&frame);
  94.  
  95.     if (ret < 0)
  96.         av_log(log_ctx, AV_LOG_ERROR, "Error loading image file '%s'\n", filename);
  97.     return ret;
  98. }
  99.