src/plugins/Input/flac/decoder_flac.cpp



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/***************************************************************************
 *   Copyright (C) 2006-2012 by Ilya Kotov                                 *
 *   forkotov02@hotmail.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 <qmmp/buffer.h>
#include <qmmp/output.h>
#include <qmmp/statehandler.h>
#include <QObject>
#include <QFile>
#include <QIODevice>
#include <FLAC/all.h>
#include "replaygainreader.h"
#include "cueparser.h"
#include "decoder_flac.h"

static size_t pack_pcm_signed (FLAC__byte *data,
                               const FLAC__int32 * const input[],
                               unsigned wide_samples,
                               unsigned channels, unsigned bps)
{
    FLAC__byte * const start = data;
    FLAC__int32 sample;
    const FLAC__int32 *input_;
    unsigned samples, channel;
    unsigned bytes_per_sample;
    unsigned incr;

    if(bps == 24) // we encode to 32-bit words
        bps = 32;
    bytes_per_sample = bps / 8;
    incr = bytes_per_sample * channels;
    for (channel = 0; channel < channels; channel++)
    {
        samples = wide_samples;
        data = start + bytes_per_sample * channel;
        input_ = input[channel];

        while (samples--)
        {
            sample = *input_++;

            switch (bps)
            {
            case 8:
                data[0] = sample;
                break;
            case 16:
                data[1] = (FLAC__byte)(sample >> 8) & 0xff;
                data[0] = (FLAC__byte)sample & 0xff;
                break;
            case 32:
                data[3] = (FLAC__byte)(sample >> 16) & 0xff;
                data[2] = (FLAC__byte)(sample >> 8) & 0xff;
                data[1] = (FLAC__byte)sample & 0xff;
                data[0] = 0;
            }
            data += incr;
        }
    }
    return wide_samples * channels * bytes_per_sample;
}

static int flac_decode (void *void_data, char *buf, int buf_len)
{
    DecoderFLAC *dflac = (DecoderFLAC *) void_data;
    unsigned to_copy;

    if (!dflac->data()->sample_buffer_fill)
    {

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

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

    to_copy = qMin((unsigned)buf_len, dflac->data()->sample_buffer_fill);
    memcpy (buf, dflac->data()->sample_buffer, to_copy);
    memmove (dflac->data()->sample_buffer,
             dflac->data()->sample_buffer + to_copy,
             dflac->data()->sample_buffer_fill - to_copy);
    dflac->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)
{
    DecoderFLAC *dflac = (DecoderFLAC *) client_data;
    qint64 res = dflac->data()->input->read((char *)buffer, *bytes);
    dflac->data()->last_bytes += res;

    if (res > 0)
    {
        *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 *,
        const FLAC__Frame *frame,
        const FLAC__int32* const buffer[],
        void *client_data)
{
    DecoderFLAC *dflac = (DecoderFLAC *) client_data;
    const unsigned wide_samples = frame->header.blocksize;

    if (dflac->data()->abort)
        return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;

    dflac->data()->bitrate = dflac->data()->last_bytes * 8.0 * frame->header.sample_rate /
                             frame->header.blocksize / 1000.0;
    dflac->data()->last_bytes = 0;

    dflac->data()->sample_buffer_fill = pack_pcm_signed (
                                            dflac->data()->sample_buffer,
                                            buffer, wide_samples,
                                            dflac->data()->channels,
                                            dflac->data()->bits_per_sample);

    return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}

static FLAC__StreamDecoderTellStatus flac_callback_tell (const FLAC__StreamDecoder *,
        FLAC__uint64 *offset,
        void *client_data)
{
    DecoderFLAC *dflac = (DecoderFLAC *) client_data;
    *offset = dflac->data()->input->pos ();
    return FLAC__STREAM_DECODER_TELL_STATUS_OK;
}

static FLAC__StreamDecoderSeekStatus flac_callback_seek (const FLAC__StreamDecoder *,
        FLAC__uint64 offset,
        void *client_data)
{
    DecoderFLAC *dflac = (DecoderFLAC *) client_data;

    return dflac->data()->input->seek(offset)
           ? FLAC__STREAM_DECODER_SEEK_STATUS_OK
           : FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
}

static FLAC__StreamDecoderLengthStatus flac_callback_length (const FLAC__StreamDecoder *,
        FLAC__uint64 *stream_length,
        void *client_data)
{
    DecoderFLAC *dflac = (DecoderFLAC *) client_data;
    *stream_length = dflac->data()->input->size();
    return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
}

static void flac_callback_metadata (const FLAC__StreamDecoder *,
                                    const FLAC__StreamMetadata *metadata,
                                    void *client_data)
{
    DecoderFLAC *dflac = (DecoderFLAC *) client_data;

    if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO)
    {
        qDebug ("DecoderFLAC: getting metadata info");

        dflac->data()->total_samples =
            (unsigned)(metadata->data.stream_info.total_samples
                       & 0xffffffff);
        dflac->data()->bits_per_sample =
            metadata->data.stream_info.bits_per_sample;
        dflac->data()->channels = metadata->data.stream_info.channels;
        dflac->data()->sample_rate = metadata->data.stream_info.sample_rate;
        dflac->data()->length = dflac->data()->total_samples * 1000 / dflac->data()->sample_rate;
    }
}

static FLAC__bool flac_callback_eof (const FLAC__StreamDecoder *, void *)
{
    return false;
}

static void flac_callback_error (const FLAC__StreamDecoder *,
                                 FLAC__StreamDecoderErrorStatus status,
                                 void *)
{
    Q_UNUSED(status);
}

// Decoder class

DecoderFLAC::DecoderFLAC(const QString &path, QIODevice *i)
        : Decoder(i)
{
    m_data = 0;
    m_path = path;
    m_data = new flac_data;
    m_data->decoder = NULL;
    data()->input = i;
    m_parser = 0;
    length_in_bytes = 0;
    m_totalBytes = 0;
    m_sz = 0;
    m_buf = 0;
    m_offset = 0;
}


DecoderFLAC::~DecoderFLAC()
{
    deinit();
    if (data())
    {
        if (data()->decoder)
            FLAC__stream_decoder_delete (data()->decoder);
        delete data();
        m_data = 0;
    }
    if(m_buf)
        delete[] m_buf;
    m_buf = 0;
}

bool DecoderFLAC::initialize()
{
    if (!data()->input)
    {
        if (m_path.startsWith("flac://")) //embeded cue track
        {
            QString p = m_path;
            p.remove("flac://");
            p.remove(QRegExp("#\\d+$"));
            TagLib::FLAC::File fileRef(p.toLocal8Bit().constData());
            //looking for cuesheet comment
            TagLib::Ogg::XiphComment *xiph_comment = fileRef.xiphComment();

            if (xiph_comment && xiph_comment->fieldListMap().contains("CUESHEET"))
            {
                qDebug("DecoderFLAC: using cuesheet xiph comment.");
                m_parser = new CUEParser(xiph_comment->fieldListMap()["CUESHEET"].toString()
                                            .toCString(true), p);
                m_track = m_path.section("#", -1).toInt();
                if(m_track > m_parser->count())
                {
                    qWarning("DecoderFLAC: invalid cuesheet xiph comment");
                    return false;
                }