1 /*** 2 This file is part of snapcast 3 Copyright (C) 2014-2020 Johannes Pohl 4 5 This program is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation, either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. 17 ***/ 18 19 #ifndef OGG_DECODER_H 20 #define OGG_DECODER_H 21 #include "decoder.hpp" 22 #ifdef HAS_TREMOR 23 #include <tremor/ivorbiscodec.h> 24 #else 25 #include <vorbis/codec.h> 26 #endif 27 #include <ogg/ogg.h> 28 29 namespace decoder 30 { 31 32 class OggDecoder : public Decoder 33 { 34 public: 35 OggDecoder(); 36 ~OggDecoder() override; 37 bool decode(msg::PcmChunk* chunk) override; 38 SampleFormat setHeader(msg::CodecHeader* chunk) override; 39 40 private: 41 bool decodePayload(msg::PcmChunk* chunk); 42 template <typename T, typename IN_TYPE> 43 T clip(const IN_TYPE& value, const T& lower, const T& upper) const 44 { 45 auto val = static_cast<int64_t>(value); 46 if (val > upper) 47 return upper; 48 if (val < lower) 49 return lower; 50 return static_cast<T>(value); 51 } 52 53 ogg_sync_state oy; /// sync and verify incoming physical bitstream 54 ogg_stream_state os; /// take physical pages, weld into a logical stream of packets 55 ogg_page og; /// one Ogg bitstream page. Vorbis packets are inside 56 ogg_packet op; /// one raw packet of data for decode 57 58 vorbis_info vi; /// struct that stores all the static vorbis bitstream settings 59 vorbis_comment vc; /// struct that stores all the bitstream user comments 60 vorbis_dsp_state vd; /// central working state for the packet->PCM decoder 61 vorbis_block vb; /// local working space for packet->PCM decode 62 63 SampleFormat sampleFormat_; 64 }; 65 66 } // namespace decoder 67 68 #endif 69