120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/*
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* Copyright 2012 Stefano Sabatini <stefasab gmail com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/imgutils.h"
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#include "lavfutils.h"
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int ff_load_image(uint8_t *data[4], int linesize[4],
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int *w, int *h, enum AVPixelFormat *pix_fmt,
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const char *filename, void *log_ctx)
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{
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AVInputFormat *iformat = NULL;
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AVFormatContext *format_ctx = NULL;
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AVCodec *codec;
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AVCodecContext *codec_ctx = NULL;
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AVCodecParameters *par;
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AVFrame *frame = NULL;
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int frame_decoded, ret = 0;
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AVPacket pkt;
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AVDictionary *opt=NULL;
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av_init_packet(&pkt);
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iformat = av_find_input_format("image2pipe");
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if ((ret = avformat_open_input(&format_ctx, filename, iformat, NULL)) < 0) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Failed to open input file '%s'\n", filename);
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return ret;
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}
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if ((ret = avformat_find_stream_info(format_ctx, NULL)) < 0) {
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av_log(log_ctx, AV_LOG_ERROR, "Find stream info failed\n");
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goto end;
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}
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par = format_ctx->streams[0]->codecpar;
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codec = avcodec_find_decoder(par->codec_id);
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if (!codec) {
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av_log(log_ctx, AV_LOG_ERROR, "Failed to find codec\n");
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ret = AVERROR(EINVAL);
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goto end;
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}
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codec_ctx = avcodec_alloc_context3(codec);
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if (!codec_ctx) {
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av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc video decoder context\n");
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ret = AVERROR(ENOMEM);
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goto end;
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}
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ret = avcodec_parameters_to_context(codec_ctx, par);
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if (ret < 0) {
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av_log(log_ctx, AV_LOG_ERROR, "Failed to copy codec parameters to decoder context\n");
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goto end;
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}
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av_dict_set(&opt, "thread_type", "slice", 0);
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if ((ret = avcodec_open2(codec_ctx, codec, &opt)) < 0) {
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av_log(log_ctx, AV_LOG_ERROR, "Failed to open codec\n");
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goto end;
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}
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if (!(frame = av_frame_alloc()) ) {
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av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc frame\n");
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ret = AVERROR(ENOMEM);
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goto end;
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}
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ret = av_read_frame(format_ctx, &pkt);
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if (ret < 0) {
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av_log(log_ctx, AV_LOG_ERROR, "Failed to read frame from file\n");
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goto end;
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}
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ret = avcodec_decode_video2(codec_ctx, frame, &frame_decoded, &pkt);
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if (ret < 0 || !frame_decoded) {
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av_log(log_ctx, AV_LOG_ERROR, "Failed to decode image from file\n");
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if (ret >= 0)
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ret = -1;
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goto end;
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}
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*w = frame->width;
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*h = frame->height;
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*pix_fmt = frame->format;
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if ((ret = av_image_alloc(data, linesize, *w, *h, *pix_fmt, 16)) < 0)
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goto end;
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ret = 0;
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av_image_copy(data, linesize, (const uint8_t **)frame->data, frame->linesize, *pix_fmt, *w, *h);
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end:
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av_packet_unref(&pkt);
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avcodec_free_context(&codec_ctx);
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avformat_close_input(&format_ctx);
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av_frame_free(&frame);
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av_dict_free(&opt);
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if (ret < 0)
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av_log(log_ctx, AV_LOG_ERROR, "Error loading image file '%s'\n", filename);
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return ret;
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}
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