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/***
This file is part of snapcast
Copyright (C) 2014-2024 Johannes Pohl
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/>.
***/
#pragma once
// local headers
#include "decoder.hpp"
// 3rd party headers
#ifdef HAS_TREMOR
#include <tremor/ivorbiscodec.h>
#else
#include <vorbis/codec.h>
#endif
#include <ogg/ogg.h>
// standard headers
#include <mutex>
namespace decoder
{
class OggDecoder : public Decoder
{
public:
OggDecoder();
~OggDecoder() override;
bool decode(msg::PcmChunk* chunk) override;
SampleFormat setHeader(msg::CodecHeader* chunk) override;
private:
bool decodePayload(msg::PcmChunk* chunk);
template <typename T, typename IN_TYPE>
T clip(const IN_TYPE& value, const T& lower, const T& upper) const
{
auto val = static_cast<int64_t>(value);
if (val > upper)
return upper;
if (val < lower)
return lower;
return static_cast<T>(value);
}
ogg_sync_state oy; /// sync and verify incoming physical bitstream
ogg_stream_state os; /// take physical pages, weld into a logical stream of packets
ogg_page og; /// one Ogg bitstream page. Vorbis packets are inside
ogg_packet op; /// one raw packet of data for decode
vorbis_info vi; /// struct that stores all the static vorbis bitstream settings
vorbis_comment vc; /// struct that stores all the bitstream user comments
vorbis_dsp_state vd; /// central working state for the packet->PCM decoder
vorbis_block vb; /// local working space for packet->PCM decode
SampleFormat sampleFormat_;
std::mutex mutex_;
};
} // namespace decoder
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