1 /* 2 * Copyright 2003-2021 The Music Player Daemon Project 3 * http://www.musicpd.org 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 2 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 along 16 * with this program; if not, write to the Free Software Foundation, Inc., 17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 18 */ 19 20 /* 21 * Common data structures and functions used by FLAC and OggFLAC 22 */ 23 24 #ifndef MPD_FLAC_COMMON_HXX 25 #define MPD_FLAC_COMMON_HXX 26 27 #include "FlacInput.hxx" 28 #include "FlacPcm.hxx" 29 #include "../DecoderAPI.hxx" 30 #include "util/ConstBuffer.hxx" 31 32 #include <FLAC/stream_decoder.h> 33 34 struct FlacDecoder : public FlacInput { 35 /** 36 * Has DecoderClient::Ready() been called yet? 37 */ 38 bool initialized = false; 39 40 /** 41 * Does the FLAC file contain an unsupported audio format? 42 */ 43 bool unsupported = false; 44 45 /** 46 * The kbit_rate parameter for the next 47 * DecoderBridge::SubmitData() call. 48 */ 49 uint16_t kbit_rate; 50 51 FlacPcmImport pcm_import; 52 53 /** 54 * End of last frame's position within the stream. This is 55 * used for bit rate calculations. 56 */ 57 FLAC__uint64 position = 0; 58 59 Tag tag; 60 61 /** 62 * Decoded PCM data obtained by our libFLAC write callback. 63 * If this is non-empty, then DecoderBridge::SubmitData() 64 * should be called. 65 */ 66 ConstBuffer<void> chunk = nullptr; 67 FlacDecoderFlacDecoder68 FlacDecoder(DecoderClient &_client, InputStream &_input_stream) 69 :FlacInput(_input_stream, &_client) {} 70 71 /** 72 * Wrapper for DecoderClient::Ready(). 73 */ 74 bool Initialize(unsigned sample_rate, unsigned bits_per_sample, 75 unsigned channels, FLAC__uint64 total_frames); 76 77 void OnMetadata(const FLAC__StreamMetadata &metadata); 78 79 FLAC__StreamDecoderWriteStatus OnWrite(const FLAC__Frame &frame, 80 const FLAC__int32 *const buf[], 81 FLAC__uint64 nbytes); 82 83 /** 84 * Calculate the delta (in bytes) between the last frame and 85 * the current frame. 86 */ 87 FLAC__uint64 GetDeltaPosition(const FLAC__StreamDecoder &sd); 88 89 private: 90 void OnStreamInfo(const FLAC__StreamMetadata_StreamInfo &stream_info); 91 void OnVorbisComment(const FLAC__StreamMetadata_VorbisComment &vc); 92 93 /** 94 * This function attempts to call DecoderClient::Ready() in case there 95 * was no STREAMINFO block. This is allowed for nonseekable streams, 96 * where the server sends us only a part of the file, without 97 * providing the STREAMINFO block from the beginning of the file 98 * (e.g. when seeking with SqueezeBox Server). 99 */ 100 bool OnFirstFrame(const FLAC__FrameHeader &header); 101 }; 102 103 #endif /* _FLAC_COMMON_H */ 104