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/*
* 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 <stdint.h>
#include "libavutil/dict.h"
#include "libavutil/imgutils.h"
#include "libavutil/log.h"
#include "libavutil/pixfmt.h"
#include "libavformat/avformat.h"
#include "libavcodec/avcodec.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)
{
const AVInputFormat *iformat = NULL;
AVFormatContext *format_ctx = NULL;
const AVCodec *codec;
AVCodecContext *codec_ctx = NULL;
AVCodecParameters *par;
AVFrame *frame = NULL;
int ret = 0;
AVPacket pkt;
AVDictionary *opt=NULL;
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");
goto end;
}
par = format_ctx->streams[0]->codecpar;
codec = avcodec_find_decoder(par->codec_id);
if (!codec) {
av_log(log_ctx, AV_LOG_ERROR, "Failed to find codec\n");
ret = AVERROR(EINVAL);
goto end;
}
codec_ctx = avcodec_alloc_context3(codec);
if (!codec_ctx) {
av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc video decoder context\n");
ret = AVERROR(ENOMEM);
goto end;
}
ret = avcodec_parameters_to_context(codec_ctx, par);
if (ret < 0) {
av_log(log_ctx, AV_LOG_ERROR, "Failed to copy codec parameters to decoder context\n");
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_send_packet(codec_ctx, &pkt);
av_packet_unref(&pkt);
if (ret < 0) {
av_log(log_ctx, AV_LOG_ERROR, "Error submitting a packet to decoder\n");
goto end;
}
ret = avcodec_receive_frame(codec_ctx, frame);
if (ret < 0) {
av_log(log_ctx, AV_LOG_ERROR, "Failed to decode image from file\n");
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_copy2(data, linesize, frame->data, frame->linesize,
*pix_fmt, *w, *h);
end:
avcodec_free_context(&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;
}
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