yading@10: /*
yading@10:  * Copyright 2012 Stefano Sabatini <stefasab gmail com>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "lavfutils.h"
yading@10: 
yading@10: int ff_load_image(uint8_t *data[4], int linesize[4],
yading@10:                   int *w, int *h, enum AVPixelFormat *pix_fmt,
yading@10:                   const char *filename, void *log_ctx)
yading@10: {
yading@10:     AVInputFormat *iformat = NULL;
yading@10:     AVFormatContext *format_ctx = NULL;
yading@10:     AVCodec *codec;
yading@10:     AVCodecContext *codec_ctx;
yading@10:     AVFrame *frame;
yading@10:     int frame_decoded, ret = 0;
yading@10:     AVPacket pkt;
yading@10: 
yading@10:     av_register_all();
yading@10: 
yading@10:     iformat = av_find_input_format("image2");
yading@10:     if ((ret = avformat_open_input(&format_ctx, filename, iformat, NULL)) < 0) {
yading@10:         av_log(log_ctx, AV_LOG_ERROR,
yading@10:                "Failed to open input file '%s'\n", filename);
yading@10:         return ret;
yading@10:     }
yading@10: 
yading@10:     codec_ctx = format_ctx->streams[0]->codec;
yading@10:     codec = avcodec_find_decoder(codec_ctx->codec_id);
yading@10:     if (!codec) {
yading@10:         av_log(log_ctx, AV_LOG_ERROR, "Failed to find codec\n");
yading@10:         ret = AVERROR(EINVAL);
yading@10:         goto end;
yading@10:     }
yading@10: 
yading@10:     if ((ret = avcodec_open2(codec_ctx, codec, NULL)) < 0) {
yading@10:         av_log(log_ctx, AV_LOG_ERROR, "Failed to open codec\n");
yading@10:         goto end;
yading@10:     }
yading@10: 
yading@10:     if (!(frame = avcodec_alloc_frame()) ) {
yading@10:         av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc frame\n");
yading@10:         ret = AVERROR(ENOMEM);
yading@10:         goto end;
yading@10:     }
yading@10: 
yading@10:     ret = av_read_frame(format_ctx, &pkt);
yading@10:     if (ret < 0) {
yading@10:         av_log(log_ctx, AV_LOG_ERROR, "Failed to read frame from file\n");
yading@10:         goto end;
yading@10:     }
yading@10: 
yading@10:     ret = avcodec_decode_video2(codec_ctx, frame, &frame_decoded, &pkt);
yading@10:     if (ret < 0 || !frame_decoded) {
yading@10:         av_log(log_ctx, AV_LOG_ERROR, "Failed to decode image from file\n");
yading@10:         goto end;
yading@10:     }
yading@10:     ret = 0;
yading@10: 
yading@10:     *w       = frame->width;
yading@10:     *h       = frame->height;
yading@10:     *pix_fmt = frame->format;
yading@10: 
yading@10:     if ((ret = av_image_alloc(data, linesize, *w, *h, *pix_fmt, 16)) < 0)
yading@10:         goto end;
yading@10:     ret = 0;
yading@10: 
yading@10:     av_image_copy(data, linesize, (const uint8_t **)frame->data, frame->linesize, *pix_fmt, *w, *h);
yading@10: 
yading@10: end:
yading@10:     avcodec_close(codec_ctx);
yading@10:     avformat_close_input(&format_ctx);
yading@10:     av_freep(&frame);
yading@10: 
yading@10:     if (ret < 0)
yading@10:         av_log(log_ctx, AV_LOG_ERROR, "Error loading image file '%s'\n", filename);
yading@10:     return ret;
yading@10: }