104 lines
2.9 KiB
C++
104 lines
2.9 KiB
C++
/*
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* Copyright 2003-2018 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* Common data structures and functions used by FLAC and OggFLAC
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*/
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#ifndef MPD_FLAC_COMMON_HXX
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#define MPD_FLAC_COMMON_HXX
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#include "FlacInput.hxx"
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#include "FlacPcm.hxx"
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#include "../DecoderAPI.hxx"
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#include "util/ConstBuffer.hxx"
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#include <FLAC/stream_decoder.h>
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struct FlacDecoder : public FlacInput {
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/**
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* Has DecoderClient::Ready() been called yet?
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*/
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bool initialized = false;
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/**
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* Does the FLAC file contain an unsupported audio format?
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*/
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bool unsupported = false;
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/**
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* The kbit_rate parameter for the next
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* DecoderBridge::SubmitData() call.
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*/
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uint16_t kbit_rate;
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FlacPcmImport pcm_import;
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/**
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* End of last frame's position within the stream. This is
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* used for bit rate calculations.
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*/
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FLAC__uint64 position = 0;
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Tag tag;
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/**
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* Decoded PCM data obtained by our libFLAC write callback.
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* If this is non-empty, then DecoderBridge::SubmitData()
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* should be called.
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*/
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ConstBuffer<void> chunk = nullptr;
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FlacDecoder(DecoderClient &_client, InputStream &_input_stream)
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:FlacInput(_input_stream, &_client) {}
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/**
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* Wrapper for DecoderClient::Ready().
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*/
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bool Initialize(unsigned sample_rate, unsigned bits_per_sample,
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unsigned channels, FLAC__uint64 total_frames);
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void OnMetadata(const FLAC__StreamMetadata &metadata);
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FLAC__StreamDecoderWriteStatus OnWrite(const FLAC__Frame &frame,
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const FLAC__int32 *const buf[],
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FLAC__uint64 nbytes);
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/**
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* Calculate the delta (in bytes) between the last frame and
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* the current frame.
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*/
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FLAC__uint64 GetDeltaPosition(const FLAC__StreamDecoder &sd);
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private:
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void OnStreamInfo(const FLAC__StreamMetadata_StreamInfo &stream_info);
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void OnVorbisComment(const FLAC__StreamMetadata_VorbisComment &vc);
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/**
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* This function attempts to call DecoderClient::Ready() in case there
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* was no STREAMINFO block. This is allowed for nonseekable streams,
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* where the server sends us only a part of the file, without
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* providing the STREAMINFO block from the beginning of the file
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* (e.g. when seeking with SqueezeBox Server).
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*/
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bool OnFirstFrame(const FLAC__FrameHeader &header);
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};
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#endif /* _FLAC_COMMON_H */
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