seekable_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
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 */

#ifndef OggFLAC__SEEKABLE_STREAM_ENCODER_H
#define OggFLAC__SEEKABLE_STREAM_ENCODER_H

#include "export.h"

#include "FLAC/stream_encoder.h"
#include "FLAC/seekable_stream_encoder.h"

#ifdef __cplusplus
extern "C" {
#endif


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

/** \defgroup oggflac_seekable_stream_encoder OggFLAC/seekable_stream_encoder.h: seekable stream encoder interface
 *  \ingroup oggflac_encoder
 *
 *  \brief
 *  This module contains the functions which implement the seekable
 *  stream encoder.  The Ogg seekable stream encoder is derived
 *  from the FLAC seekable stream encoder.
 *
 * The interface here is nearly identical to FLAC's seekable stream
 * encoder, including the callbacks, with the addition of a new required
 * read callback (needed when writing back STREAMINFO after encoding) and
 * OggFLAC__seekable_stream_encoder_set_serial_number().  See the
 * \link flac_seekable_stream_encoder FLAC seekable stream encoder module \endlink
 * for full documentation.
 *
 * \{
 */


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

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

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

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

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

	OggFLAC__SEEKABLE_STREAM_ENCODER_WRITE_ERROR,
	/**< The write callback returned an error. */

	OggFLAC__SEEKABLE_STREAM_ENCODER_READ_ERROR,
	/**< The read callback returned an error. */

	OggFLAC__SEEKABLE_STREAM_ENCODER_SEEK_ERROR,
	/**< The seek callback returned an error. */

	OggFLAC__SEEKABLE_STREAM_ENCODER_TELL_ERROR,
	/**< The tell callback returned an error. */

	OggFLAC__SEEKABLE_STREAM_ENCODER_ALREADY_INITIALIZED,
	/**< OggFLAC__seekable_stream_encoder_init() was called when the encoder was
	 * already initialized, usually because
	 * OggFLAC__seekable_stream_encoder_finish() was not called.
	 */

	OggFLAC__SEEKABLE_STREAM_ENCODER_INVALID_CALLBACK,
	/**< OggFLAC__seekable_stream_encoder_init() was called without all
	 * callbacks being set.
	 */

	OggFLAC__SEEKABLE_STREAM_ENCODER_INVALID_SEEKTABLE,
	/**< An invalid seek table was passed is the metadata to
	 * OggFLAC__seekable_stream_encoder_set_metadata().
	 */

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

} OggFLAC__SeekableStreamEncoderState;

/** 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__SeekableStreamEncoderStateString[];


/** Return values for the OggFLAC__SeekableStreamEncoder read callback.
 */
typedef enum {

	OggFLAC__SEEKABLE_STREAM_ENCODER_READ_STATUS_CONTINUE,
	/**< The read was OK and decoding can continue. */

	OggFLAC__SEEKABLE_STREAM_ENCODER_READ_STATUS_END_OF_STREAM,
	/**< The read was attempted at the end of the stream. */

	OggFLAC__SEEKABLE_STREAM_ENCODER_READ_STATUS_ABORT
	/**< An unrecoverable error occurred. */

} OggFLAC__SeekableStreamEncoderReadStatus;

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


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

struct OggFLAC__SeekableStreamEncoderProtected;
struct OggFLAC__SeekableStreamEncoderPrivate;
/** The opaque structure definition for the seekable stream encoder type.
 *  See the \link oggflac_seekable_stream_encoder seekable stream encoder module \endlink
 *  for a detailed description.
 */
typedef struct {
	struct OggFLAC__SeekableStreamEncoderProtected *protected_; /* avoid the C++ keyword 'protected' */
	struct OggFLAC__SeekableStreamEncoderPrivate *private_; /* avoid the C++ keyword 'private' */
} OggFLAC__SeekableStreamEncoder;

/** Signature for the read callback.
 *  See OggFLAC__seekable_stream_encoder_set_read_callback() for more info.
 *
 * \param  encoder  The encoder instance calling the callback.
 * \param  buffer   A pointer to a location for the callee to store
 *                  data to be encoded.
 * \param  bytes    A pointer to the size of the buffer.  On entry
 *                  to the callback, it contains the maximum number
 *                  of bytes that may be stored in \a buffer.  The
 *                  callee must set it to the actual number of bytes
 *                  stored (0 in case of error or end-of-stream) before
 *                  returning.
 * \param  client_data  The callee's client data set through
 *                      OggFLAC__seekable_stream_encoder_set_client_data().
 * \retval OggFLAC__SeekableStreamEncoderReadStatus
 *    The callee's return status.
 */
typedef OggFLAC__SeekableStreamEncoderReadStatus (*OggFLAC__SeekableStreamEncoderReadCallback)(const OggFLAC__SeekableStreamEncoder *encoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);

/** Signature for the seek callback.
 *  See OggFLAC__seekable_stream_encoder_set_seek_callback()
 *  and FLAC__SeekableStreamEncoderSeekCallback for more info.
 *
 * \param  encoder  The encoder instance calling the callback.
 * \param  absolute_byte_offset  The offset from the beginning of the stream
 *                               to seek to.
 * \param  client_data  The callee's client data set through
 *                      OggFLAC__seekable_stream_encoder_set_client_data().
 * \retval FLAC__SeekableStreamEncoderSeekStatus
 *    The callee's return status.
 */
typedef FLAC__SeekableStreamEncoderSeekStatus (*OggFLAC__SeekableStreamEncoderSeekCallback)(const OggFLAC__SeekableStreamEncoder *encoder, FLAC__uint64 absolute_byte_offset, void *client_data);

/** Signature for the tell callback.
 *  See OggFLAC__seekable_stream_encoder_set_tell_callback()
 *  and FLAC__SeekableStreamEncoderTellCallback for more info.
 *
 * \param  encoder  The encoder instance calling the callback.
 * \param  absolute_byte_offset  The address at which to store the current
 *                               position of the output.
 * \param  client_data  The callee's client data set through
 *                      OggFLAC__seekable_stream_encoder_set_client_data().
 * \retval FLAC__SeekableStreamEncoderTellStatus
 *    The callee's return status.
 */
typedef FLAC__SeekableStreamEncoderTellStatus (*OggFLAC__SeekableStreamEncoderTellCallback)(const OggFLAC__SeekableStreamEncoder *encoder, FLAC__uint64 *absolute_byte_offset, void *client_data);

/** Signature for the write callback.
 *  See OggFLAC__seekable_stream_encoder_set_write_callback()
 *  and FLAC__SeekableStreamEncoderWriteCallback 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__seekable_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__seekable_stream_encoder_set_client_data().
 * \retval FLAC__StreamEncoderWriteStatus
 *    The callee's return status.
 */
typedef FLAC__StreamEncoderWriteStatus (*OggFLAC__SeekableStreamEncoderWriteCallback)(const OggFLAC__SeekableStreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data);


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

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


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

/** Set the serial number for the FLAC stream.
 *
 * \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__seekable_stream_encoder_set_serial_number(OggFLAC__SeekableStreamEncoder *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__seekable_stream_encoder_set_verify(OggFLAC__SeekableStreamEncoder *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__seekable_stream_encoder_set_streamable_subset(OggFLAC__SeekableStreamEncoder *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