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/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* Common data structures and functions used by FLAC and OggFLAC
*/
#ifndef MPD_FLAC_COMMON_HXX
#define MPD_FLAC_COMMON_HXX
#include "FlacInput.hxx"
#include "FlacPcm.hxx"
#include "../DecoderAPI.hxx"
#include "util/ConstBuffer.hxx"
#include <FLAC/stream_decoder.h>
struct FlacDecoder : public FlacInput {
/**
* Has DecoderClient::Ready() been called yet?
*/
bool initialized = false;
/**
* Does the FLAC file contain an unsupported audio format?
*/
bool unsupported = false;
/**
* The kbit_rate parameter for the next
* DecoderBridge::SubmitData() call.
*/
uint16_t kbit_rate;
FlacPcmImport pcm_import;
/**
* End of last frame's position within the stream. This is
* used for bit rate calculations.
*/
FLAC__uint64 position = 0;
Tag tag;
/**
* Decoded PCM data obtained by our libFLAC write callback.
* If this is non-empty, then DecoderBridge::SubmitData()
* should be called.
*/
ConstBuffer<void> chunk = nullptr;
FlacDecoder(DecoderClient &_client, InputStream &_input_stream)
:FlacInput(_input_stream, &_client) {}
/**
* Wrapper for DecoderClient::Ready().
*/
bool Initialize(unsigned sample_rate, unsigned bits_per_sample,
unsigned channels, FLAC__uint64 total_frames);
void OnMetadata(const FLAC__StreamMetadata &metadata);
FLAC__StreamDecoderWriteStatus OnWrite(const FLAC__Frame &frame,
const FLAC__int32 *const buf[],
FLAC__uint64 nbytes);
/**
* Calculate the delta (in bytes) between the last frame and
* the current frame.
*/
FLAC__uint64 GetDeltaPosition(const FLAC__StreamDecoder &sd);
private:
void OnStreamInfo(const FLAC__StreamMetadata_StreamInfo &stream_info);
void OnVorbisComment(const FLAC__StreamMetadata_VorbisComment &vc);
/**
* This function attempts to call DecoderClient::Ready() in case there
* was no STREAMINFO block. This is allowed for nonseekable streams,
* where the server sends us only a part of the file, without
* providing the STREAMINFO block from the beginning of the file
* (e.g. when seeking with SqueezeBox Server).
*/
bool OnFirstFrame(const FLAC__FrameHeader &header);
};
#endif /* _FLAC_COMMON_H */
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