qmmp - Qmmp with Jyrki's patches

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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.         *
 ***************************************************************************/

#include <QtDebug>
#include "replaygainreader.h"
#include "decoder_ffmpeg.h"
extern "C"{
#include <libavutil/channel_layout.h>
#include <libavutil/frame.h>
}

// callbacks

static int ffmpeg_read(void *data, uint8_t *buf, int size)
{
    DecoderFFmpeg *d = (DecoderFFmpeg*)data;
#if (LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(57,84,101))
    if(d->input()->atEnd())
        return AVERROR_EOF;
#endif
    return static_cast<int>(d->input()->read((char*)buf, size));
}

static int64_t ffmpeg_seek(void *data, int64_t offset, int whence)
{
    DecoderFFmpeg *d = static_cast<DecoderFFmpeg*>(data);
    int64_t absolute_pos = 0;
    /*if(d->input()->isSequential())
        return -1;*/
    switch( whence )
    {
    case AVSEEK_SIZE:
        return d->input()->size();
    case SEEK_SET:
        absolute_pos = offset;
        break;
    case SEEK_CUR:
        absolute_pos = d->input()->pos() + offset;
        break;
    case SEEK_END:
        absolute_pos = d->input()->size() - offset;
        break;
    default:
        return -1;
    }
    if(absolute_pos < 0 || absolute_pos > d->input()->size())
        return -1;
    return d->input()->seek(absolute_pos);
}

// Decoder class
DecoderFFmpeg::DecoderFFmpeg(const QString &path, QIODevice *i) : Decoder(i),
    m_path(path)

{
    m_pkt = av_packet_alloc();
}

DecoderFFmpeg::~DecoderFFmpeg()
{
    m_bitrate = 0;
    if(m_codecContext)
        avcodec_free_context(&m_codecContext);
    if (m_formatContext)
        avformat_free_context(m_formatContext);

    av_packet_free(&m_pkt);

    if(m_stream)
        avio_context_free(&m_stream);

    if(m_frame)
        av_frame_free(&m_frame);
}

bool DecoderFFmpeg::initialize()
{
    m_bitrate = 0;
    m_totalTime = 0;
    m_seekTime = -1;
    m_eof = false;

    m_formatContext = avformat_alloc_context();

    AVProbeData pd;
    memset(&pd, 0, sizeof(pd));
    uint8_t buf[PROBE_BUFFER_SIZE + AVPROBE_PADDING_SIZE];
    pd.filename = m_path.toLocal8Bit().constData();
    pd.buf_size = input()->peek((char*)buf, sizeof(buf) - AVPROBE_PADDING_SIZE);


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