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/* libFLAC++ - Free Lossless Audio Codec library
* Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009 Josh Coalson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the Xiph.org Foundation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef FLACPP__DECODER_H
#define FLACPP__DECODER_H
#include "export.h"
#include <string>
#include "FLAC/stream_decoder.h"
/** \file include/FLAC++/decoder.h
*
* \brief
* This module contains the classes which implement the various
* decoders.
*
* See the detailed documentation in the
* \link flacpp_decoder decoder \endlink module.
*/
/** \defgroup flacpp_decoder FLAC++/decoder.h: decoder classes
* \ingroup flacpp
*
* \brief
* This module describes the decoder layers provided by libFLAC++.
*
* The libFLAC++ decoder classes are object wrappers around their
* counterparts in libFLAC. All decoding layers available in
* libFLAC are also provided here. The interface is very similar;
* make sure to read the \link flac_decoder libFLAC decoder module \endlink.
*
* There are only two significant differences here. First, instead of
* passing in C function pointers for callbacks, you inherit from the
* decoder class and provide implementations for the callbacks in your
* derived class; because of this there is no need for a 'client_data'
* property.
*
* Second, there are two stream decoder classes. FLAC::Decoder::Stream
* is used for the same cases that FLAC__stream_decoder_init_stream() /
* FLAC__stream_decoder_init_ogg_stream() are used, and FLAC::Decoder::File
* is used for the same cases that
* FLAC__stream_decoder_init_FILE() and FLAC__stream_decoder_init_file() /
* FLAC__stream_decoder_init_ogg_FILE() and FLAC__stream_decoder_init_ogg_file()
* are used.
*/
namespace FLAC {
namespace Decoder {
/** \ingroup flacpp_decoder
* \brief
* This class wraps the ::FLAC__StreamDecoder. If you are
* decoding from a file, FLAC::Decoder::File may be more
* convenient.
*
* The usage of this class is similar to FLAC__StreamDecoder,
* except instead of providing callbacks to
* FLAC__stream_decoder_init*_stream(), you will inherit from this
* class and override the virtual callback functions with your
* own implementations, then call init() or init_ogg(). The rest
* of the calls work the same as in the C layer.
*
* Only the read, write, and error callbacks are mandatory. The
* others are optional; this class provides default
* implementations that do nothing. In order for seeking to work
* you must overide seek_callback(), tell_callback(),
* length_callback(), and eof_callback().
*/
class FLACPP_API Stream {
public:
/** This class is a wrapper around FLAC__StreamDecoderState.
*/
class FLACPP_API State {
public:
inline State(::FLAC__StreamDecoderState state): state_(state) { }
inline operator ::FLAC__StreamDecoderState() const { return state_; }
inline const char *as_cstring() const { return ::FLAC__StreamDecoderStateString[state_]; }
inline const char *resolved_as_cstring(const Stream &decoder) const { return ::FLAC__stream_decoder_get_resolved_state_string(decoder.decoder_); }
protected:
::FLAC__StreamDecoderState state_;
};
Stream();
virtual ~Stream();
//@{
/** Call after construction to check the that the object was created
* successfully. If not, use get_state() to find out why not.
*/
virtual bool is_valid() const;
inline operator bool() const { return is_valid(); } ///< See is_valid()
//@}
virtual bool set_ogg_serial_number(long value); ///< See FLAC__stream_decoder_set_ogg_serial_number()
virtual bool set_md5_checking(bool value); ///< See FLAC__stream_decoder_set_md5_checking()
virtual bool set_metadata_respond(::FLAC__MetadataType type); ///< See FLAC__stream_decoder_set_metadata_respond()
virtual bool set_metadata_respond_application(const FLAC__byte id[4]); ///< See FLAC__stream_decoder_set_metadata_respond_application()
virtual bool set_metadata_respond_all(); ///< See FLAC__stream_decoder_set_metadata_respond_all()
virtual bool set_metadata_ignore(::FLAC__MetadataType type); ///< See FLAC__stream_decoder_set_metadata_ignore()
virtual bool set_metadata_ignore_application(const FLAC__byte id[4]); ///< See FLAC__stream_decoder_set_metadata_ignore_application()
virtual bool set_metadata_ignore_all(); ///< See FLAC__stream_decoder_set_metadata_ignore_all()
/* get_state() is not virtual since we want subclasses to be able to return their own state */
State get_state() const; ///< See FLAC__stream_decoder_get_state()
virtual bool get_md5_checking() const; ///< See FLAC__stream_decoder_get_md5_checking()
virtual FLAC__uint64 get_total_samples() const; ///< See FLAC__stream_decoder_get_total_samples()
virtual unsigned get_channels() const; ///< See FLAC__stream_decoder_get_channels()
virtual ::FLAC__ChannelAssignment get_channel_assignment() const; ///< See FLAC__stream_decoder_get_channel_assignment()
virtual unsigned get_bits_per_sample() const; ///< See FLAC__stream_decoder_get_bits_per_sample()
virtual unsigned get_sample_rate() const; ///< See FLAC__stream_decoder_get_sample_rate()
virtual unsigned get_blocksize() const; ///< See FLAC__stream_decoder_get_blocksize()
virtual bool get_decode_position(FLAC__uint64 *position) const; ///< See FLAC__stream_decoder_get_decode_position()
virtual ::FLAC__StreamDecoderInitStatus init(); ///< Seek FLAC__stream_decoder_init_stream()
virtual ::FLAC__StreamDecoderInitStatus init_ogg(); ///< Seek FLAC__stream_decoder_init_ogg_stream()
virtual bool finish(); ///< See FLAC__stream_decoder_finish()
virtual bool flush(); ///< See FLAC__stream_decoder_flush()
virtual bool reset(); ///< See FLAC__stream_decoder_reset()
virtual bool process_single(); ///< See FLAC__stream_decoder_process_single()
virtual bool process_until_end_of_metadata(); ///< See FLAC__stream_decoder_process_until_end_of_metadata()
virtual bool process_until_end_of_stream(); ///< See FLAC__stream_decoder_process_until_end_of_stream()
virtual bool skip_single_frame(); ///< See FLAC__stream_decoder_skip_single_frame()
virtual bool seek_absolute(FLAC__uint64 sample); ///< See FLAC__stream_decoder_seek_absolute()
protected:
/// see FLAC__StreamDecoderReadCallback
virtual ::FLAC__StreamDecoderReadStatus read_callback(FLAC__byte buffer[], size_t *bytes) = 0;
/// see FLAC__StreamDecoderSeekCallback
virtual ::FLAC__StreamDecoderSeekStatus seek_callback(FLAC__uint64 absolute_byte_offset);
/// see FLAC__StreamDecoderTellCallback
virtual ::FLAC__StreamDecoderTellStatus tell_callback(FLAC__uint64 *absolute_byte_offset);
/// see FLAC__StreamDecoderLengthCallback
virtual ::FLAC__StreamDecoderLengthStatus length_callback(FLAC__uint64 *stream_length);
/// see FLAC__StreamDecoderEofCallback
virtual bool eof_callback();
/// see FLAC__StreamDecoderWriteCallback
virtual ::FLAC__StreamDecoderWriteStatus write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[]) = 0;
/// see FLAC__StreamDecoderMetadataCallback
virtual void metadata_callback(const ::FLAC__StreamMetadata *metadata);
/// see FLAC__StreamDecoderErrorCallback
virtual void error_callback(::FLAC__StreamDecoderErrorStatus status) = 0;
#if (defined _MSC_VER) || (defined __BORLANDC__) || (defined __GNUG__ && (__GNUG__ < 2 || (__GNUG__ == 2 && __GNUC_MINOR__ < 96))) || (defined __SUNPRO_CC)
// lame hack: some MSVC/GCC versions can't see a protected decoder_ from nested State::resolved_as_cstring()
friend State;
#endif
::FLAC__StreamDecoder *decoder_;
static ::FLAC__StreamDecoderReadStatus read_callback_(const ::FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
static ::FLAC__StreamDecoderSeekStatus seek_callback_(const ::FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
static ::FLAC__StreamDecoderTellStatus tell_callback_(const ::FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
static ::FLAC__StreamDecoderLengthStatus length_callback_(const ::FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
static FLAC__bool eof_callback_(const ::FLAC__StreamDecoder *decoder, void *client_data);
static ::FLAC__StreamDecoderWriteStatus write_callback_(const ::FLAC__StreamDecoder *decoder, const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
static void metadata_callback_(const ::FLAC__StreamDecoder *decoder, const ::FLAC__StreamMetadata *metadata, void *client_data);
static void error_callback_(const ::FLAC__StreamDecoder *decoder, ::FLAC__StreamDecoderErrorStatus status, void *client_data);
private:
// Private and undefined so you can't use them:
Stream(const Stream &);
void operator=(const Stream &);
};
/** \ingroup flacpp_decoder
* \brief
* This class wraps the ::FLAC__StreamDecoder. If you are
* not decoding from a file, you may need to use
* FLAC::Decoder::Stream.
*
* The usage of this class is similar to FLAC__StreamDecoder,
* except instead of providing callbacks to
* FLAC__stream_decoder_init*_FILE() or
* FLAC__stream_decoder_init*_file(), you will inherit from this
* class and override the virtual callback functions with your
* own implementations, then call init() or init_off(). The rest
* of the calls work the same as in the C layer.
*
* Only the write, and error callbacks from FLAC::Decoder::Stream
* are mandatory. The others are optional; this class provides
* full working implementations for all other callbacks and
* supports seeking.
*/
class FLACPP_API File: public Stream {
public:
File();
virtual ~File();
virtual ::FLAC__StreamDecoderInitStatus init(FILE *file); ///< See FLAC__stream_decoder_init_FILE()
virtual ::FLAC__StreamDecoderInitStatus init(const char *filename); ///< See FLAC__stream_decoder_init_file()
virtual ::FLAC__StreamDecoderInitStatus init(const std::string &filename); ///< See FLAC__stream_decoder_init_file()
virtual ::FLAC__StreamDecoderInitStatus init_ogg(FILE *file); ///< See FLAC__stream_decoder_init_ogg_FILE()
virtual ::FLAC__StreamDecoderInitStatus init_ogg(const char *filename); ///< See FLAC__stream_decoder_init_ogg_file()
virtual ::FLAC__StreamDecoderInitStatus init_ogg(const std::string &filename); ///< See FLAC__stream_decoder_init_ogg_file()
protected:
// this is a dummy implementation to satisfy the pure virtual in Stream that is actually supplied internally by the C layer
virtual ::FLAC__StreamDecoderReadStatus read_callback(FLAC__byte buffer[], size_t *bytes);
private:
// Private and undefined so you can't use them:
File(const File &);
void operator=(const File &);
};
}
}
#endif
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