decoder.h

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/* libOggFLAC++ - Free Lossless Audio Codec + Ogg library
 * Copyright (C) 2002,2003,2004,2005  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 OggFLACPP__DECODER_H
#define OggFLACPP__DECODER_H

#include "export.h"

#include "OggFLAC/file_decoder.h"
#include "OggFLAC/seekable_stream_decoder.h"
#include "OggFLAC/stream_decoder.h"
// we only need this for the state abstraction really...
#include "FLAC++/decoder.h"


/** \file include/OggFLAC++/decoder.h
 *
 *  \brief
 *  This module contains the classes which implement the various
 *  decoders.
 *
 *  See the detailed documentation in the
 *  \link oggflacpp_decoder decoder \endlink module.
 */

/** \defgroup oggflacpp_decoder OggFLAC++/decoder.h: decoder classes
 *  \ingroup oggflacpp
 *
 *  \brief
 *  This module describes the three decoder layers provided by libOggFLAC++.
 *
 * The libOggFLAC++ decoder classes are object wrappers around their
 * counterparts in libOggFLAC.  All three decoding layers available in
 * libOggFLAC are also provided here.  The interface is very similar;
 * make sure to read the \link oggflac_decoder libOggFLAC decoder module \endlink.
 *
 * The only real difference here is that instead of passing in C function
 * pointers for callbacks, you inherit from the decoder class and provide
 * implementations for the callbacks in the derived class; because of this
 * there is no need for a 'client_data' property.
 */

namespace OggFLAC {
	namespace Decoder {

		// ============================================================
		//
		//  Equivalent: OggFLAC__StreamDecoder
		//
		// ============================================================

		/** \defgroup oggflacpp_stream_decoder OggFLAC++/decoder.h: stream decoder class
		 *  \ingroup oggflacpp_decoder
		 *
		 *  \brief
		 *  This class wraps the ::OggFLAC__StreamDecoder.
		 *
		 * See the \link oggflac_stream_decoder libOggFLAC stream decoder module \endlink.
		 *
		 * \{
		 */

		/** This class wraps the ::OggFLAC__StreamDecoder.
		 */
		class OggFLACPP_API Stream {
		public:
			class OggFLACPP_API State {
			public:
				inline State(::OggFLAC__StreamDecoderState state): state_(state) { }
				inline operator ::OggFLAC__StreamDecoderState() const { return state_; }
				inline const char *as_cstring() const { return ::OggFLAC__StreamDecoderStateString[state_]; }
				inline const char *resolved_as_cstring(const Stream &decoder) const { return ::OggFLAC__stream_decoder_get_resolved_state_string(decoder.decoder_); }
			protected:
				::OggFLAC__StreamDecoderState state_;
			};

			Stream();
			virtual ~Stream();

			bool is_valid() const;
			inline operator bool() const { return is_valid(); }

			bool set_serial_number(long value);
			bool set_metadata_respond(::FLAC__MetadataType type);
			bool set_metadata_respond_application(const FLAC__byte id[4]);
			bool set_metadata_respond_all();
			bool set_metadata_ignore(::FLAC__MetadataType type);
			bool set_metadata_ignore_application(const FLAC__byte id[4]);
			bool set_metadata_ignore_all();

			State get_state() const;
			FLAC::Decoder::Stream::State get_FLAC_stream_decoder_state() const;
			unsigned get_channels() const;
			::FLAC__ChannelAssignment get_channel_assignment() const;
			unsigned get_bits_per_sample() const;
			unsigned get_sample_rate() const;
			unsigned get_blocksize() const;

			/** Initialize the instance; as with the C interface,
			 *  init() should be called after construction and 'set'
			 *  calls but before any of the 'process' calls.
			 */
			State init();

			void finish();

			bool flush();
			bool reset();

			bool process_single();
			bool process_until_end_of_metadata();
			bool process_until_end_of_stream();
		protected:
			virtual ::FLAC__StreamDecoderReadStatus read_callback(FLAC__byte buffer[], unsigned *bytes) = 0;
			virtual ::FLAC__StreamDecoderWriteStatus write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[]) = 0;
			virtual void metadata_callback(const ::FLAC__StreamMetadata *metadata) = 0;
			virtual void error_callback(::FLAC__StreamDecoderErrorStatus status) = 0;

#if (defined _MSC_VER) || (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
			::OggFLAC__StreamDecoder *decoder_;
		private:
			static ::FLAC__StreamDecoderReadStatus read_callback_(const ::OggFLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);
			static ::FLAC__StreamDecoderWriteStatus write_callback_(const ::OggFLAC__StreamDecoder *decoder, const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
			static void metadata_callback_(const ::OggFLAC__StreamDecoder *decoder, const ::FLAC__StreamMetadata *metadata, void *client_data);
			static void error_callback_(const ::OggFLAC__StreamDecoder *decoder, ::FLAC__StreamDecoderErrorStatus status, void *client_data);

			// Private and undefined so you can't use them:
			Stream(const Stream &);
			void operator=(const Stream &);
		};

		/* \} */

		// ============================================================
		//
		//  Equivalent: OggFLAC__SeekableStreamDecoder
		//
		// ============================================================

		/** \defgroup oggflacpp_seekable_stream_decoder OggFLAC++/decoder.h: seekable stream decoder class
		 *  \ingroup oggflacpp_decoder
		 *
		 *  \brief
		 *  This class wraps the ::OggFLAC__SeekableStreamDecoder.
		 *
		 * See the \link oggflac_seekable_stream_decoder libOggFLAC seekable stream decoder module \endlink.
		 *
		 * \{