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| -rw-r--r-- | include/FLAC++/decoder.h | 248 |
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diff --git a/include/FLAC++/decoder.h b/include/FLAC++/decoder.h new file mode 100644 index 0000000..6f0bda9 --- /dev/null +++ b/include/FLAC++/decoder.h @@ -0,0 +1,248 @@ +/* libFLAC++ - Free Lossless Audio Codec library + * Copyright (C) 2002-2009 Josh Coalson + * Copyright (C) 2011-2023 Xiph.Org Foundation + * + * 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 override 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 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 uint32_t get_channels() const; ///< See FLAC__stream_decoder_get_channels() + virtual ::FLAC__ChannelAssignment get_channel_assignment() const; ///< See FLAC__stream_decoder_get_channel_assignment() + virtual uint32_t get_bits_per_sample() const; ///< See FLAC__stream_decoder_get_bits_per_sample() + virtual uint32_t get_sample_rate() const; ///< See FLAC__stream_decoder_get_sample_rate() + virtual uint32_t 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 __BORLANDC__) || (defined __GNUG__ && (__GNUG__ < 2 || (__GNUG__ == 2 && __GNUC_MINOR__ < 96))) || (defined __SUNPRO_CC) + // lame hack: some compilers 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(); + + using Stream::init; + 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() + using Stream::init_ogg; + 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 |