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authorSatoru Sato <ssato@redhat.com>2001-08-29 06:02:47 +0000
committerSatoru Sato <ssato@redhat.com>2001-08-29 06:02:47 +0000
commit908753e603bf333d4d9acd2bfe4850e038fd207a (patch)
tree5fcf09f8d32364591e419fa111d16ca1a4678da9 /src/testd.c
parentfa4e0bcdf55480718e99a5dbe21c60415dcbf7aa (diff)
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/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
   Copyright (C) 2010 Red Hat, Inc.

   This library 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.

   This library 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 this library; if not, see <http://www.gnu.org/licenses/>.
*/

#ifndef WIN32
#include "config.h"
#endif

#include "common.h"
#include "debug.h"
#include "utils.h"
#include "mjpeg_decoder.h"

enum {
    STATE_READ_HEADER,
    STATE_START_DECOMPRESS,
    STATE_READ_SCANLINES,
    STATE_FINISH_DECOMPRESS
};

extern "C" {

    static void init_source(j_decompress_ptr cinfo)
    {
    }

    static boolean fill_input_buffer(j_decompress_ptr cinfo)
    {
        return FALSE;
    }

    void mjpeg_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
    {
        MJpegDecoder *decoder = (MJpegDecoder *)cinfo;
        if (num_bytes > 0) {
            if (cinfo->src->bytes_in_buffer >= (size_t)num_bytes) {
                cinfo->src->next_input_byte += (size_t) num_bytes;
                cinfo->src->bytes_in_buffer -= (size_t) num_bytes;
            } else {
                decoder->_extra_skip = num_bytes - cinfo->src->bytes_in_buffer;
                cinfo->src->bytes_in_buffer = 0;
            }
        }
    }

    static void term_source (j_decompress_ptr cinfo)
    {
        return;
    }
}

MJpegDecoder::MJpegDecoder(int width, int height,
                           int stride,
                           uint8_t *frame,
                           bool back_compat) :
    _data(NULL)
    , _data_size(0)
    , _data_start(0)
    , _data_end(0)
    , _extra_skip(0)
    , _width(width)
    , _height(height)
    , _stride(stride)
    , _frame(frame)
    , _back_compat(back_compat)
    , _y(0)
    , _state(0)
{
    memset(&_cinfo, 0, sizeof(_cinfo));
    _cinfo.err = jpeg_std_error (&_jerr);
    jpeg_create_decompress (&_cinfo);

    _cinfo.src = &_jsrc;
    _cinfo.src->init_source = init_source;
    _cinfo.src->fill_input_buffer = fill_input_buffer;
    _cinfo.src->skip_input_data = mjpeg_skip_input_data;
    _cinfo.src->resync_to_restart = jpeg_resync_to_restart;
    _cinfo.src->term_source = term_source;

    _scanline = new uint8_t[width * 3];
}

MJpegDecoder::~MJpegDecoder()
{
    jpeg_destroy_decompress(&_cinfo);
    delete [] _scanline;
    if (_data) {
        delete [] _data;
    }
}

void MJpegDecoder::convert_scanline(void)
{
    uint32_t *row;
    uint32_t c;
    uint8_t *s;
    int x;

    ASSERT(_width % 2 == 0);
    ASSERT(_height % 2 == 0);

   row = (uint32_t *)(_frame + _y * _stride);
    s = _scanline;


    if (_back_compat) {
        /* We need to check for the old major and for backwards compat
           a) swap r and b (done)
           b) to-yuv with right values and then from-yuv with old wrong values (TODO)
        */
        for (x = 0; x < _width; x++) {
            c = s[2] << 16 | s[1] << 8 | s[0];