mirror of
https://github.com/cookiengineer/audacity
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247 lines
12 KiB
C++
247 lines
12 KiB
C++
/* libFLAC++ - Free Lossless Audio Codec library
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* Copyright (C) 2002-2009 Josh Coalson
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* Copyright (C) 2011-2013 Xiph.Org Foundation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of the Xiph.org Foundation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef FLACPP__DECODER_H
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#define FLACPP__DECODER_H
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#include "export.h"
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#include <string>
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#include "FLAC/stream_decoder.h"
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/** \file include/FLAC++/decoder.h
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*
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* \brief
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* This module contains the classes which implement the various
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* decoders.
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*
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* See the detailed documentation in the
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* \link flacpp_decoder decoder \endlink module.
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*/
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/** \defgroup flacpp_decoder FLAC++/decoder.h: decoder classes
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* \ingroup flacpp
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*
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* \brief
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* This module describes the decoder layers provided by libFLAC++.
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*
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* The libFLAC++ decoder classes are object wrappers around their
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* counterparts in libFLAC. All decoding layers available in
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* libFLAC are also provided here. The interface is very similar;
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* make sure to read the \link flac_decoder libFLAC decoder module \endlink.
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*
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* There are only two significant differences here. First, instead of
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* passing in C function pointers for callbacks, you inherit from the
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* decoder class and provide implementations for the callbacks in your
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* derived class; because of this there is no need for a 'client_data'
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* property.
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*
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* Second, there are two stream decoder classes. FLAC::Decoder::Stream
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* is used for the same cases that FLAC__stream_decoder_init_stream() /
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* FLAC__stream_decoder_init_ogg_stream() are used, and FLAC::Decoder::File
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* is used for the same cases that
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* FLAC__stream_decoder_init_FILE() and FLAC__stream_decoder_init_file() /
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* FLAC__stream_decoder_init_ogg_FILE() and FLAC__stream_decoder_init_ogg_file()
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* are used.
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*/
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namespace FLAC {
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namespace Decoder {
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/** \ingroup flacpp_decoder
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* \brief
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* This class wraps the ::FLAC__StreamDecoder. If you are
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* decoding from a file, FLAC::Decoder::File may be more
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* convenient.
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*
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* The usage of this class is similar to FLAC__StreamDecoder,
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* except instead of providing callbacks to
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* FLAC__stream_decoder_init*_stream(), you will inherit from this
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* class and override the virtual callback functions with your
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* own implementations, then call init() or init_ogg(). The rest
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* of the calls work the same as in the C layer.
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*
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* Only the read, write, and error callbacks are mandatory. The
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* others are optional; this class provides default
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* implementations that do nothing. In order for seeking to work
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* you must overide seek_callback(), tell_callback(),
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* length_callback(), and eof_callback().
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*/
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class FLACPP_API Stream {
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public:
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/** This class is a wrapper around FLAC__StreamDecoderState.
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*/
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class FLACPP_API State {
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public:
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inline State(::FLAC__StreamDecoderState state): state_(state) { }
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inline operator ::FLAC__StreamDecoderState() const { return state_; }
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inline const char *as_cstring() const { return ::FLAC__StreamDecoderStateString[state_]; }
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inline const char *resolved_as_cstring(const Stream &decoder) const { return ::FLAC__stream_decoder_get_resolved_state_string(decoder.decoder_); }
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protected:
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::FLAC__StreamDecoderState state_;
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};
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Stream();
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virtual ~Stream();
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//@{
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/** Call after construction to check the that the object was created
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* successfully. If not, use get_state() to find out why not.
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*/
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virtual bool is_valid() const;
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inline operator bool() const { return is_valid(); } ///< See is_valid()
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//@}
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virtual bool set_ogg_serial_number(long value); ///< See FLAC__stream_decoder_set_ogg_serial_number()
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virtual bool set_md5_checking(bool value); ///< See FLAC__stream_decoder_set_md5_checking()
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virtual bool set_metadata_respond(::FLAC__MetadataType type); ///< See FLAC__stream_decoder_set_metadata_respond()
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virtual bool set_metadata_respond_application(const FLAC__byte id[4]); ///< See FLAC__stream_decoder_set_metadata_respond_application()
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virtual bool set_metadata_respond_all(); ///< See FLAC__stream_decoder_set_metadata_respond_all()
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virtual bool set_metadata_ignore(::FLAC__MetadataType type); ///< See FLAC__stream_decoder_set_metadata_ignore()
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virtual bool set_metadata_ignore_application(const FLAC__byte id[4]); ///< See FLAC__stream_decoder_set_metadata_ignore_application()
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virtual bool set_metadata_ignore_all(); ///< See FLAC__stream_decoder_set_metadata_ignore_all()
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/* get_state() is not virtual since we want subclasses to be able to return their own state */
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State get_state() const; ///< See FLAC__stream_decoder_get_state()
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virtual bool get_md5_checking() const; ///< See FLAC__stream_decoder_get_md5_checking()
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virtual FLAC__uint64 get_total_samples() const; ///< See FLAC__stream_decoder_get_total_samples()
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virtual unsigned get_channels() const; ///< See FLAC__stream_decoder_get_channels()
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virtual ::FLAC__ChannelAssignment get_channel_assignment() const; ///< See FLAC__stream_decoder_get_channel_assignment()
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virtual unsigned get_bits_per_sample() const; ///< See FLAC__stream_decoder_get_bits_per_sample()
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virtual unsigned get_sample_rate() const; ///< See FLAC__stream_decoder_get_sample_rate()
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virtual unsigned get_blocksize() const; ///< See FLAC__stream_decoder_get_blocksize()
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virtual bool get_decode_position(FLAC__uint64 *position) const; ///< See FLAC__stream_decoder_get_decode_position()
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virtual ::FLAC__StreamDecoderInitStatus init(); ///< Seek FLAC__stream_decoder_init_stream()
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virtual ::FLAC__StreamDecoderInitStatus init_ogg(); ///< Seek FLAC__stream_decoder_init_ogg_stream()
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virtual bool finish(); ///< See FLAC__stream_decoder_finish()
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virtual bool flush(); ///< See FLAC__stream_decoder_flush()
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virtual bool reset(); ///< See FLAC__stream_decoder_reset()
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virtual bool process_single(); ///< See FLAC__stream_decoder_process_single()
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virtual bool process_until_end_of_metadata(); ///< See FLAC__stream_decoder_process_until_end_of_metadata()
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virtual bool process_until_end_of_stream(); ///< See FLAC__stream_decoder_process_until_end_of_stream()
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virtual bool skip_single_frame(); ///< See FLAC__stream_decoder_skip_single_frame()
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virtual bool seek_absolute(FLAC__uint64 sample); ///< See FLAC__stream_decoder_seek_absolute()
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protected:
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/// see FLAC__StreamDecoderReadCallback
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virtual ::FLAC__StreamDecoderReadStatus read_callback(FLAC__byte buffer[], size_t *bytes) = 0;
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/// see FLAC__StreamDecoderSeekCallback
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virtual ::FLAC__StreamDecoderSeekStatus seek_callback(FLAC__uint64 absolute_byte_offset);
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/// see FLAC__StreamDecoderTellCallback
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virtual ::FLAC__StreamDecoderTellStatus tell_callback(FLAC__uint64 *absolute_byte_offset);
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/// see FLAC__StreamDecoderLengthCallback
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virtual ::FLAC__StreamDecoderLengthStatus length_callback(FLAC__uint64 *stream_length);
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/// see FLAC__StreamDecoderEofCallback
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virtual bool eof_callback();
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/// see FLAC__StreamDecoderWriteCallback
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virtual ::FLAC__StreamDecoderWriteStatus write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[]) = 0;
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/// see FLAC__StreamDecoderMetadataCallback
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virtual void metadata_callback(const ::FLAC__StreamMetadata *metadata);
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/// see FLAC__StreamDecoderErrorCallback
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virtual void error_callback(::FLAC__StreamDecoderErrorStatus status) = 0;
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#if (defined _MSC_VER) || (defined __BORLANDC__) || (defined __GNUG__ && (__GNUG__ < 2 || (__GNUG__ == 2 && __GNUC_MINOR__ < 96))) || (defined __SUNPRO_CC)
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// lame hack: some MSVC/GCC versions can't see a protected decoder_ from nested State::resolved_as_cstring()
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friend State;
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#endif
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::FLAC__StreamDecoder *decoder_;
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static ::FLAC__StreamDecoderReadStatus read_callback_(const ::FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
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static ::FLAC__StreamDecoderSeekStatus seek_callback_(const ::FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
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static ::FLAC__StreamDecoderTellStatus tell_callback_(const ::FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
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static ::FLAC__StreamDecoderLengthStatus length_callback_(const ::FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
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static FLAC__bool eof_callback_(const ::FLAC__StreamDecoder *decoder, void *client_data);
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static ::FLAC__StreamDecoderWriteStatus write_callback_(const ::FLAC__StreamDecoder *decoder, const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
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static void metadata_callback_(const ::FLAC__StreamDecoder *decoder, const ::FLAC__StreamMetadata *metadata, void *client_data);
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static void error_callback_(const ::FLAC__StreamDecoder *decoder, ::FLAC__StreamDecoderErrorStatus status, void *client_data);
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private:
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// Private and undefined so you can't use them:
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Stream(const Stream &);
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void operator=(const Stream &);
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};
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/** \ingroup flacpp_decoder
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* \brief
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* This class wraps the ::FLAC__StreamDecoder. If you are
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* not decoding from a file, you may need to use
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* FLAC::Decoder::Stream.
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*
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* The usage of this class is similar to FLAC__StreamDecoder,
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* except instead of providing callbacks to
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* FLAC__stream_decoder_init*_FILE() or
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* FLAC__stream_decoder_init*_file(), you will inherit from this
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* class and override the virtual callback functions with your
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* own implementations, then call init() or init_off(). The rest
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* of the calls work the same as in the C layer.
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*
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* Only the write, and error callbacks from FLAC::Decoder::Stream
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* are mandatory. The others are optional; this class provides
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* full working implementations for all other callbacks and
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* supports seeking.
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*/
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class FLACPP_API File: public Stream {
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public:
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File();
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virtual ~File();
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virtual ::FLAC__StreamDecoderInitStatus init(FILE *file); ///< See FLAC__stream_decoder_init_FILE()
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virtual ::FLAC__StreamDecoderInitStatus init(const char *filename); ///< See FLAC__stream_decoder_init_file()
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virtual ::FLAC__StreamDecoderInitStatus init(const std::string &filename); ///< See FLAC__stream_decoder_init_file()
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virtual ::FLAC__StreamDecoderInitStatus init_ogg(FILE *file); ///< See FLAC__stream_decoder_init_ogg_FILE()
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virtual ::FLAC__StreamDecoderInitStatus init_ogg(const char *filename); ///< See FLAC__stream_decoder_init_ogg_file()
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virtual ::FLAC__StreamDecoderInitStatus init_ogg(const std::string &filename); ///< See FLAC__stream_decoder_init_ogg_file()
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protected:
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// this is a dummy implementation to satisfy the pure virtual in Stream that is actually supplied internally by the C layer
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virtual ::FLAC__StreamDecoderReadStatus read_callback(FLAC__byte buffer[], size_t *bytes);
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private:
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// Private and undefined so you can't use them:
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File(const File &);
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void operator=(const File &);
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};
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}
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}
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#endif
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