src/plugins/Input/flac/decoder_flac.cpp



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/***************************************************************************
 *   Copyright (C) 2006-2021 by Ilya Kotov                                 *
 *   forkotov02@ya.ru                                                      *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
 ***************************************************************************/


/* The code is based on MOC by Damian Pietras <daper@daper.net>
   and libxmms-flac written by Josh Coalson. */


#include <taglib/tag.h>
#include <taglib/fileref.h>
#include <taglib/flacfile.h>
#include <taglib/xiphcomment.h>
#include <taglib/tmap.h>
#include <taglib/id3v2header.h>
#include <taglib/tfilestream.h>
#include <taglib/id3v2framefactory.h>
#include <QObject>
#include <QFile>
#include <QIODevice>
#include <QRegularExpression>
#include <FLAC/all.h>
#include <stdint.h>
#include <qmmp/cueparser.h>
#include "decoder_flac.h"

#define BITRATE_CALC_TIME_MS 2000

static size_t pack_pcm_signed (FLAC__byte *output,
                               const FLAC__int32 * const input[],
                               unsigned samples,
                               unsigned channels, unsigned bps)
{
    unsigned channel = 0;

    uint8_t *data8 = (uint8_t *) output;
    uint16_t *data16 = (uint16_t *) output;
    uint32_t *data32 = (uint32_t *) output;

     for(unsigned sample = 0; sample < samples; sample++)
     {
         for (channel = 0; channel < channels; channel++)
         {
             switch (bps)
             {
             case 8:
                 *data8 = input[channel][sample] & 0xff;
                 data8++;
                 break;
             case 16:
                 *data16 = input[channel][sample] & 0xffffff;
                 data16++;
                 break;
             case 24:
                 *data32 = (input[channel][sample] << 8) & 0xffffff00;
                 data32++;
                 break;
             case 32:
                 *data32 = input[channel][sample];
                 data32++;
                 break;
             }
         }
     }

     if(bps == 24) // we encode to 32-bit words
         bps = 32;

     return samples * channels * bps / 8;
}

static int flac_decode (void *client_data, unsigned char *buf, int buf_len)
{
    flac_data *data = static_cast<flac_data *>(client_data);
    unsigned to_copy;

    if (!data->sample_buffer_fill)
    {

        if (FLAC__stream_decoder_get_state(data->decoder)
                == FLAC__STREAM_DECODER_END_OF_STREAM)
        {
            return 0;
        }

        if (!FLAC__stream_decoder_process_single(
                    data->decoder))
        {
            return 0;
        }
    }

    to_copy = qMin((unsigned)buf_len, data->sample_buffer_fill);
    memcpy (buf, data->sample_buffer, to_copy);
    memmove (data->sample_buffer,
             data->sample_buffer + to_copy,
             data->sample_buffer_fill - to_copy);
    data->sample_buffer_fill -= to_copy;
    return to_copy;
}


static FLAC__StreamDecoderReadStatus flac_callback_read (const FLAC__StreamDecoder*,
        FLAC__byte buffer[],
        size_t *bytes,
        void *client_data)
{
    flac_data *data = static_cast<flac_data *>(client_data);
    qint64 res = data->input->read((char *)buffer, *bytes);

    if (res > 0)
    {
        *bytes = res;
        data->read_bytes += res;
        return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
    }
    if (res == 0)
    {
        *bytes = res;
        return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
    }

    return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
}

static FLAC__StreamDecoderWriteStatus flac_callback_write (const FLAC__StreamDecoder *d,
        const FLAC__Frame *frame,
        const FLAC__int32* const buffer[],
        void *client_data)
{
    flac_data *data = static_cast<flac_data *>(client_data);