/***
        This file is part of snapcast
        Copyright (C) 2015  Hannes Ellinger

        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 3 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, see <http://www.gnu.org/licenses/>.
***/

#include "opus_decoder.hpp"
#include "common/aixlog.hpp"


OpusDecoder::OpusDecoder() : Decoder()
{
    int error;
    dec_ = opus_decoder_create(48000, 2, &error); // fixme
    if (error != 0)
    {
        LOG(ERROR) << "Failed to initialize opus decoder: " << error << '\n' << " Rate:     " << 48000 << '\n' << " Channels: " << 2 << '\n';
    }
}


OpusDecoder::~OpusDecoder()
{
    if (dec_ != nullptr)
        opus_decoder_destroy(dec_);
}


bool OpusDecoder::decode(msg::PcmChunk* chunk)
{
    size_t samples = 480;
    // reserve space for decoded audio
    if (pcm_.size() < samples * 2)
        pcm_.resize(samples * 2);

    // decode
    int frame_size = opus_decode(dec_, (unsigned char*)chunk->payload, chunk->payloadSize, pcm_.data(), samples, 0);
    if (frame_size < 0)
    {
        LOG(ERROR) << "Failed to decode chunk: " << frame_size << '\n' << " IN size:  " << chunk->payloadSize << '\n' << " OUT size: " << samples * 4 << '\n';
        return false;
    }
    else
    {
        LOG(DEBUG) << "Decoded chunk: size " << chunk->payloadSize << " bytes, decoded " << frame_size << " bytes" << '\n';

        // copy encoded data to chunk
        chunk->payloadSize = samples * 4;
        chunk->payload = (char*)realloc(chunk->payload, chunk->payloadSize);
        memcpy(chunk->payload, (char*)pcm_.data(), samples * 4);
        return true;
    }
}


SampleFormat OpusDecoder::setHeader(msg::CodecHeader* /*chunk*/)
{
    return {48000, 16, 2};
}