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/*
* 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) 1993-2001 by Sun Microsystems, Inc.
* All rights reserved.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <AudioExtent.h>
#include <stdio.h>
// class AudioExtent methods
// class AudioExtent Constructor
AudioExtent::
AudioExtent(
Audio* obj, // audio object to point to
double s, // start time
double e): // end time
Audio("[extent]"), ref(obj)
{
ref->Reference(); // reference audio object
SetStart(s); // set start/end times
SetEnd(e);
}
// class AudioExtent Destructor
AudioExtent::
~AudioExtent()
{
ref->Dereference(); // clear audio object reference
}
// Get referenced object
Audio* AudioExtent::
GetRef() const
{
return (ref);
}
// Set referenced object
void AudioExtent::
SetRef(
Audio* r) // new audio object
{
if (ref == r) // object is not changing
return;
ref->Dereference(); // dereference previous object
if (r != 0) {
ref = r;
ref->Reference(); // reference new object
} else {
PrintMsg(_MGET_("AudioExtent:...NULL Audio object reference"),
Fatal);
}
}
// Get start time
Double AudioExtent::
GetStart() const
{
return (start);
}
// Set start time
void AudioExtent::
SetStart(
Double s) // start time, in seconds
{
if (Undefined(s) || (s < 0.))
start = 0.;
else
start = s;
}
// Get end time
Double AudioExtent::
GetEnd() const
{
// If determinate endpoint, return it
if (!Undefined(end))
return (end);
// Otherwise, return the endpoint of the underlying object
return (ref->GetLength());
}
// Set end time
void AudioExtent::
SetEnd(
Double e) // end time, in seconds
{
Double len;
// If known endpoint and object has known size, do not exceed size
if (!Undefined(e)) {
len = ref->GetLength();
if (!Undefined(len) && (e > len))
e = len;
}
end = e;
}
// Get the length of an audio extent
Double AudioExtent::
GetLength() const
{
Double x;
// If extent end is indeterminate, use the end of the target object
x = GetEnd();
// If the object length is indeterminate, then the length is
if (Undefined(x))
return (x);
return (x - start);
}
// Construct a name for the list
char *AudioExtent::
GetName() const
{
// XXX - construct a better name
return (ref->GetName());
}
// Get the audio header for the current read position
AudioHdr AudioExtent::
GetHeader()
{
return (ref->GetDHeader(ReadPosition() + start));
}
// Get the audio header for the given position
AudioHdr AudioExtent::
GetHeader(
Double pos) // position
{
return (ref->GetDHeader(pos + start));
}
// Copy data from extent into specified buffer.
// No data format translation takes place.
// The object's read position is not updated.
//
// Since the extent could refer to a list of extents of differing encodings,
// clients should always use GetHeader() in combination with ReadData()
AudioError AudioExtent::
ReadData(
void* buf, // destination buffer address
size_t& len, // buffer size (updated)
Double& pos) // start position (updated)
{
size_t cnt;
off_t buflen;
Double off;
Double newpos;
AudioError err;
// Save buffer size and zero transfer count
cnt = len;
len = 0;
// Position must be valid
if (Undefined(pos) || (pos < 0.) || ((int)cnt < 0))
return (RaiseError(AUDIO_ERR_BADARG));
// If the end is determinate, check start position and length
off = pos + start;
newpos = GetEnd();
if (!Undefined(newpos)) {
// If starting beyond eof, give up now
if (off >= newpos) {
err = AUDIO_EOF;
err.sys = AUDIO_COPY_INPUT_EOF;
return (err);
}
// If the read would extend beyond end-of-extent, shorten it
buflen = GetHeader(pos).Time_to_Bytes((Double)(newpos - off));
if (buflen == 0) {
err = AUDIO_EOF;
err.sys = AUDIO_COPY_INPUT_EOF;
return (err);
}
if (buflen < cnt)
cnt = (size_t)buflen;
}
// Zero-length reads are easy
if (cnt == 0) {
err = AUDIO_SUCCESS;
err.sys = AUDIO_COPY_ZERO_LIMIT;
return (err);
}
// Save the offset, read data, and update the returned position
newpos = off;
len = cnt;
err = ref->ReadData(buf, len, newpos);
pos = (newpos - start); // XXX - calculate bytes and convert?
return (err);
}
// Write to AudioExtent is (currently) prohibited
AudioError AudioExtent::
WriteData(
void*, // destination buffer address
size_t& len, // buffer size (updated)
Double&) // start position (updated)
{
len = 0;
return (RaiseError(AUDIO_ERR_NOEFFECT));
}
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