stream_encoder.h

tcpmp.src.0.72RC1 优秀的多媒体播放器TCPMP的源代码

/* 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 OggFLAC__STREAM_ENCODER_H
#define OggFLAC__STREAM_ENCODER_H

#include "export.h"

#include "FLAC/stream_encoder.h"

#ifdef __cplusplus
extern "C" {
#endif


/** \file include/OggFLAC/stream_encoder.h
 *
 *  \brief
 *  This module contains the functions which implement the stream
 *  encoder.
 *
 *  See the detailed documentation in the
 *  \link oggflac_stream_encoder stream encoder \endlink module.
 */

/** \defgroup oggflac_encoder OggFLAC/ *_encoder.h: encoder interfaces
 *  \ingroup oggflac
 *
 *  \brief
 *  This module describes the three encoder layers provided by libOggFLAC.
 *
 * libOggFLAC currently provides the same three layers of access as libFLAC;
 * the interfaces are nearly identical, with the addition of a method for
 * specifying the Ogg serial number.  See the \link flac_encoder FLAC
 * encoder module \endlink for full documentation.
 */

/** \defgroup oggflac_stream_encoder OggFLAC/stream_encoder.h: stream encoder interface
 *  \ingroup oggflac_encoder
 *
 *  \brief
 *  This module contains the functions which implement the stream
 *  encoder.  The Ogg stream encoder is derived
 *  from the FLAC stream encoder.
 *
 * The interface here is nearly identical to FLAC's stream encoder,
 * including the callbacks, with the addition of
 * OggFLAC__stream_encoder_set_serial_number().  See the
 * \link flac_stream_encoder FLAC stream encoder module \endlink
 * for full documentation.
 *
 * \{
 */


/** State values for an OggFLAC__StreamEncoder
 *
 *  The encoder's state can be obtained by calling OggFLAC__stream_encoder_get_state().
 */
typedef enum {

	OggFLAC__STREAM_ENCODER_OK = 0,
	/**< The encoder is in the normal OK state. */

	OggFLAC__STREAM_ENCODER_OGG_ERROR,
	/**< An error occurred in the underlying Ogg layer.  */

	OggFLAC__STREAM_ENCODER_FLAC_STREAM_ENCODER_ERROR,
	/**< An error occurred in the underlying FLAC stream encoder;
	 * check OggFLAC__stream_encoder_get_FLAC_stream_encoder_state().
	 */

	OggFLAC__STREAM_ENCODER_INVALID_CALLBACK,
	/**< The encoder was initialized before setting all the required callbacks. */

	OggFLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR,
	/**< Memory allocation failed. */

	OggFLAC__STREAM_ENCODER_ALREADY_INITIALIZED,
	/**< OggFLAC__stream_encoder_init() was called when the encoder was
	 * already initialized, usually because
	 * OggFLAC__stream_encoder_finish() was not called.
	 */

	OggFLAC__STREAM_ENCODER_UNINITIALIZED
	/**< The encoder is in the uninitialized state. */

} OggFLAC__StreamEncoderState;

/** Maps an OggFLAC__StreamEncoderState to a C string.
 *
 *  Using an OggFLAC__StreamEncoderState as the index to this array
 *  will give the string equivalent.  The contents should not be modified.
 */
extern OggFLAC_API const char * const OggFLAC__StreamEncoderStateString[];


/***********************************************************************
 *
 * class OggFLAC__StreamEncoder
 *
 ***********************************************************************/

struct OggFLAC__StreamEncoderProtected;
struct OggFLAC__StreamEncoderPrivate;
/** The opaque structure definition for the stream encoder type.
 *  See the \link oggflac_stream_encoder stream encoder module \endlink
 *  for a detailed description.
 */
typedef struct {
	struct OggFLAC__StreamEncoderProtected *protected_; /* avoid the C++ keyword 'protected' */
	struct OggFLAC__StreamEncoderPrivate *private_; /* avoid the C++ keyword 'private' */
} OggFLAC__StreamEncoder;

/** Signature for the write callback.
 *  See OggFLAC__stream_encoder_set_write_callback()
 *  and FLAC__StreamEncoderWriteCallback for more info.
 *
 * \param  encoder  The encoder instance calling the callback.
 * \param  buffer   An array of encoded data of length \a bytes.
 * \param  bytes    The byte length of \a buffer.
 * \param  samples  The number of samples encoded by \a buffer.
 *                  \c 0 has a special meaning; see
 *                  OggFLAC__stream_encoder_set_write_callback().
 * \param  current_frame  The number of current frame being encoded.
 * \param  client_data  The callee's client data set through
 *                      OggFLAC__stream_encoder_set_client_data().
 * \retval FLAC__StreamEncoderWriteStatus
 *    The callee's return status.
 */
typedef FLAC__StreamEncoderWriteStatus (*OggFLAC__StreamEncoderWriteCallback)(const OggFLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data);

/** Signature for the metadata callback.
 *  See OggFLAC__stream_encoder_set_metadata_callback()
 *  and FLAC__stream_encoder_set_metadata_callback() for more info.
 *
 * \param  encoder      The encoder instance calling the callback.
 * \param  metadata     The final populated STREAMINFO block.
 * \param  client_data  The callee's client data set through
 *                      FLAC__stream_encoder_set_client_data().
 */
typedef void (*OggFLAC__StreamEncoderMetadataCallback)(const OggFLAC__StreamEncoder *encoder, const FLAC__StreamMetadata *metadata, void *client_data);


/***********************************************************************
 *
 * Class constructor/destructor
 *
 ***********************************************************************/

/** Create a new stream encoder instance.  The instance is created with
 *  default settings; see the individual OggFLAC__stream_encoder_set_*()
 *  functions for each setting's default.
 *
 * \retval OggFLAC__StreamEncoder*
 *    \c NULL if there was an error allocating memory, else the new instance.
 */
OggFLAC_API OggFLAC__StreamEncoder *OggFLAC__stream_encoder_new();

/** Free an encoder instance.  Deletes the object pointed to by \a encoder.
 *
 * \param encoder  A pointer to an existing encoder.
 * \assert
 *    \code encoder != NULL \endcode
 */
OggFLAC_API void OggFLAC__stream_encoder_delete(OggFLAC__StreamEncoder *encoder);


/***********************************************************************
 *
 * Public class method prototypes
 *
 ***********************************************************************/

/** Set the serial number for the FLAC stream.
 *
 * \note
 * It is recommended to set a serial number explicitly as the default of '0'
 * may collide with other streams.
 *
 * \default \c 0
 * \param  encoder        An encoder instance to set.
 * \param  serial_number  See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
OggFLAC_API FLAC__bool OggFLAC__stream_encoder_set_serial_number(OggFLAC__StreamEncoder *encoder, long serial_number);

/** This is inherited from FLAC__StreamEncoder; see FLAC__stream_encoder_set_verify()
 *
 * \default \c false
 * \param  encoder  An encoder instance to set.
 * \param  value    Flag value (see above).
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
OggFLAC_API FLAC__bool OggFLAC__stream_encoder_set_verify(OggFLAC__StreamEncoder *encoder, FLAC__bool value);

/** This is inherited from FLAC__StreamEncoder; see FLAC__stream_encoder_set_streamable_subset()
 *
 * \default \c true
 * \param  encoder  An encoder instance to set.
 * \param  value    Flag value (see above).
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
OggFLAC_API FLAC__bool OggFLAC__stream_encoder_set_streamable_subset(OggFLAC__StreamEncoder *encoder, FLAC__bool value);

/** This is inherited from FLAC__StreamEncoder; see FLAC__stream_encoder_set_do_mid_side_stereo()
 *
 * \default \c false
 * \param  encoder  An encoder instance to set.
 * \param  value    Flag value (see above).
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
OggFLAC_API FLAC__bool OggFLAC__stream_encoder_set_do_mid_side_stereo(OggFLAC__StreamEncoder *encoder, FLAC__bool value);

/** This is inherited from FLAC__StreamEncoder; see FLAC__stream_encoder_set_loose_mid_side_stereo()
 *
 * \default \c false
 * \param  encoder  An encoder instance to set.
 * \param  value    Flag value (see above).
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
OggFLAC_API FLAC__bool OggFLAC__stream_encoder_set_loose_mid_side_stereo(OggFLAC__StreamEncoder *encoder, FLAC__bool value);

/** This is inherited from FLAC__StreamEncoder; see FLAC__stream_encoder_set_channels()
 *
 * \default \c 2
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
OggFLAC_API FLAC__bool OggFLAC__stream_encoder_set_channels(OggFLAC__StreamEncoder *encoder, unsigned value);