audio/include/AudioStream.h

	AudioStream.h revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1990-2001 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#ifndef _MULTIMEDIA_AUDIOSTREAM_H
#define _MULTIMEDIA_AUDIOSTREAM_H

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <Audio.h>
#include <AudioHdr.h>
#include <stdlib.h>
#include <AudioDebug.h>

#ifdef __cplusplus
extern "C" {
#endif

// This is the abstract base class for all audio data sources/sinks.
// It is invalid to create an object of type AudioStream.

class AudioStream : public Audio {
private:
    AudioHdr    hdr;            // data encoding info
    Double      length;         // length of data, in secs

protected:

    Boolean hdrset() const;         // TRUE if header valid

    // Set header (always)
    AudioError updateheader(
        const AudioHdr& h);         // header to copy

    // Set data length
    void setlength(
        Double len);            // new length, in secs

    virtual Boolean opened() const = 0; // TRUE if stream 'open'

public:
    AudioStream(const char *path = ""); // Constructor

    // Set header
    virtual AudioError SetHeader(
        const AudioHdr& h);         // header to copy

    // Set data length
    virtual void SetLength(
        Double len);            // new length, in secs

    // XXX - is this needed?  do we need time->sample frames?
    virtual size_t GetByteCount() const;        // Get length, in bytes

    // class Audio methods specialized here
    virtual AudioHdr GetHeader();           // Get header

    virtual Double GetLength() const;       // Get length, in secs

    // Make sure endian of the data matches the current processor.
    AudioError coerceEndian(unsigned char *buf, size_t len,
        AudioEndian en);

    virtual Boolean isEndianSensitive() const;
    AudioEndian localByteOrder() const
    {
        return (hdr.localByteOrder());
    }
};

#include <AudioStream_inline.h>

#ifdef __cplusplus
}
#endif

#endif /* !_MULTIMEDIA_AUDIOSTREAM_H */