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<pre class="sourcecodebox">/*
File: simpleAVCSample.c
Description: Sample showing use of the IOFireWireAVCFamily
Author: <JAS>
Copyright: © Copyright 2002 Apple Computer, Inc. All rights reserved.
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
("Apple") in consideration of your agreement to the following terms, and your
use, installation, modification or redistribution of this Apple software
constitutes acceptance of these terms. If you do not agree with these terms,
please do not use, install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and subject
to these terms, Apple grants you a personal, non-exclusive license, under Apple's
copyrights in this original Apple software (the "Apple Software"), to use,
reproduce, modify and redistribute the Apple Software, with or without
modifications, in source and/or binary forms; provided that if you redistribute
the Apple Software in its entirety and without modifications, you must retain
this notice and the following text and disclaimers in all such redistributions of
the Apple Software. Neither the name, trademarks, service marks or logos of
Apple Computer, Inc. may be used to endorse or promote products derived from the
Apple Software without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or implied,
are granted by Apple herein, including but not limited to any patent rights that
may be infringed by your derivative works or by other works in which the Apple
Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
(INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Change History (most recent first):
When Who Version What
==== === ======= ====
04/04/02 JAS 1.0 Created
*/
#include <stdio.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/IOCFPlugin.h>
#include <IOKit/avc/IOFireWireAVCLib.h>
#include <IOKit/avc/IOFireWireAVCConsts.h>
#include <CoreFoundation/CoreFoundation.h>
#include <unistd.h>
#include "simpleAVCSample.h"
// prototypes
void DisplayAVCResponse( UInt8* response, UInt32 responseLen );
void DisplayUnitInfo( UInt8* response, UInt32 responseLen );
void DisplaySubunitInfo( UInt8* response, UInt32 responseLen );
void Wait10Seconds( void );
CFMutableDictionaryRef CreateMatchingDictionary( void );
int main (int argc, const char * argv[])
{
kern_return_t result;
mach_port_t masterPort;
CFMutableDictionaryRef matchingDictionary;
io_iterator_t iter;
io_object_t service;
// get the master port for talking with IOKit
result = IOMasterPort( MACH_PORT_NULL, &masterPort );
// create a matching dictionary for AVC units
matchingDictionary = CreateMatchingDictionary();
// find all IOServices of class IOFireWireAVCUnit that use AVC protocol
result = IOServiceGetMatchingServices( masterPort, matchingDictionary, &iter );
/*
Note:
IOServiceGetMatchingServices consumes one reference to the dictionary passed in.
Since there is only one reference to our dictionary it will automatically be destroyed.
This is why we don't release the dictionary later when we clean up.
*/
// try opening a userclient to send commands to the first device
if( service = IOIteratorNext( iter ) )
{
IOCFPlugInInterface** interface;
SInt32 score = 0;
// get the IUnknown interface for the IOFireWireAVCUnit
result = IOCreatePlugInInterfaceForService( service,
kIOFireWireAVCLibUnitTypeID,
kIOCFPlugInInterfaceID,
&interface,
&score );
// if we got the IUnknown interface
if( (kIOReturnSuccess == result) && interface )
{
IOFireWireAVCLibUnitInterface** avcUnit;
// ask for the AVC unit interface
result = (*interface)->QueryInterface( interface,
CFUUIDGetUUIDBytes( kIOFireWireAVCLibUnitInterfaceID ),
(LPVOID)&avcUnit );
// if we got the AVC unit interface
if( kIOReturnSuccess == result )
{
UInt8 command[20];
UInt32 cmdLen = 0;
UInt8 response[256];
UInt32 responseLen = 0;
// open the AVC unit interface
(*avcUnit)->open( avcUnit );
// set up the UNIT INFO command
command[kAVCCommandResponse] = kAVCStatusInquiryCommand;
command[kAVCAddress] = 0xFF;
command[kAVCOpcode] = kAVCUnitInfoOpcode;
command[kAVCOperand0] = 0xFF;
command[kAVCOperand1] = 0xFF;
command[kAVCOperand2] = 0xFF;
command[kAVCOperand3] = 0xFF;
command[kAVCOperand4] = 0xFF;
cmdLen = 8;
responseLen = sizeof( response );
// try sending a UNIT INFO command
result = (*avcUnit)->AVCCommand( avcUnit,
command,
cmdLen,
response,
&responseLen );
printf( "\nUNIT INFO result: 0x%08X responseLen: %ld\n", result, responseLen );
if( kIOReturnSuccess == result )
{
// show info returned in the UNIT INFO response
DisplayAVCResponse( response, responseLen );
DisplayUnitInfo( response, responseLen );
}
// set up the SUBUNIT INFO command
command[kAVCCommandResponse] = kAVCStatusInquiryCommand;
command[kAVCAddress] = 0xFF;
command[kAVCOpcode] = kAVCSubunitInfoOpcode;
command[kAVCOperand0] = 0x07;
command[kAVCOperand1] = 0xFF;
command[kAVCOperand2] = 0xFF;
command[kAVCOperand3] = 0xFF;
command[kAVCOperand4] = 0xFF;
cmdLen = 8;
responseLen = sizeof( response );
// try sending the SUBUNIT INFO command
result = (*avcUnit)->AVCCommand( avcUnit,
command,
cmdLen,
response,
&responseLen );
printf( "\nSUBUNIT INFO result: 0x%08X responseLen: %ld\n", result, responseLen );
if( kIOReturnSuccess == result )
{
// show info returned by the SUBUNIT INFO command
DisplayAVCResponse( response, responseLen );
DisplaySubunitInfo( response, responseLen );
}
// try sending a PLAY command to a VCR
// set up the PLAY command
command[kAVCCommandResponse] = kAVCControlCommand;
command[kAVCAddress] = (kAVCTapeRecorder << 3) | 0;
command[kAVCOpcode] = 0xC3; // PLAY
command[kAVCOperand0] = 0x75; // forward normal speed
cmdLen = 4;
responseLen = sizeof( response );
result = (*avcUnit)->AVCCommand( avcUnit,
command,
cmdLen,
response,
&responseLen );
printf( "\nPLAY result: 0x%08X\n", result );
if( kIOReturnSuccess == result )
{
DisplayAVCResponse( response, responseLen );
if( response[kAVCCommandResponse] == kAVCAcceptedStatus )
Wait10Seconds();
}
// set up the WIND command
command[kAVCCommandResponse] = kAVCControlCommand;
command[kAVCAddress] = (kAVCTapeRecorder << 3) | 0;
command[kAVCOpcode] = 0xC4; // WIND
command[kAVCOperand0] = 0x60; // stop all transport motion
cmdLen = 4;
responseLen = sizeof( response );
// try sending a WIND STOP command
result = (*avcUnit)->AVCCommand( avcUnit,
command,
cmdLen,
response,
&responseLen );
printf( "\nWIND STOP result: 0x%08X\n", result );
if( kIOReturnSuccess == result )
DisplayAVCResponse( response, responseLen );
// close the AVC unit interface
(*avcUnit)->close( avcUnit );
// release the AVC unit interface
(*avcUnit)->Release( avcUnit );
}
}
// clean up
if( interface )
result = IODestroyPlugInInterface( interface );
}
else // guess we did not find any AVC units
printf( "\n***Did not find any AVC devices***\n" );
return 0;
}
// display the response from the device
void DisplayAVCResponse( UInt8* response, UInt32 responseLen )
{
printf( "\tresponse: 0x%02X %s\n", response[0] & 0x0F, responseStr[response[0] & 0x0F] );
printf( "\tsubunit_type: 0x%02X\n", IOAVCType(response[1]) );
printf( "\tsubunit_ID: 0x%02X\n", IOAVCId(response[1]) );
printf( "\topcode: 0x%02X\n", response[2] );
}
// display the unit info
void DisplayUnitInfo( UInt8* response, UInt32 responseLen )
{
printf( "\toperand0: 0x%02X\n", response[kAVCOperand0] );
printf( "\tunit_type: 0x%02X %s\n", IOAVCType(response[kAVCOperand1]),
unitTypeStr[IOAVCType(response[kAVCOperand1])] );
printf( "\tunit: 0x%02X\n", IOAVCId(response[kAVCOperand1]) );
printf( "\tcompany ID: 0x%02X%02X%02X\n", response[kAVCOperand2],
response[kAVCOperand3],
response[kAVCOperand4] );
}
// display info about the first 4 subunits
void DisplaySubunitInfo( UInt8* response, UInt32 responseLen )
{
printf( "\toperand0: 0x%02X\n", response[kAVCOperand0] );
printf( "\tsubunit type: 0x%02X %s", IOAVCType(response[kAVCOperand1]),
unitTypeStr[IOAVCType(response[kAVCOperand1])] );
printf( " count: %d\n", IOAVCId(response[kAVCOperand1]) + 1 );
printf( "\tsubunit type: 0x%02X %s", IOAVCType(response[kAVCOperand2]),
unitTypeStr[IOAVCType(response[kAVCOperand2])] );
printf( " count: %d\n", IOAVCId(response[kAVCOperand2]) + 1 );
printf( "\tsubunit type: 0x%02X %s", IOAVCType(response[kAVCOperand3]),
unitTypeStr[IOAVCType(response[kAVCOperand3])] );
printf( " count: %d\n", IOAVCId(response[kAVCOperand3]) + 1 );
printf( "\tsubunit type: 0x%02X %s", IOAVCType(response[kAVCOperand4]),
unitTypeStr[IOAVCType(response[kAVCOperand4])] );
printf( " count: %d\n", IOAVCId(response[kAVCOperand4]) + 1 );
}
// delay for 10 seconds printing a . onscreen every second
void Wait10Seconds( void )
{
int i;
printf( "\nPlaying:" );
for( i=0; i<10; i++ )
{
printf( "." );
fflush( stdout );
sleep(1);
}
printf( "\n" );
}
CFMutableDictionaryRef CreateMatchingDictionary( void )
{
CFMutableDictionaryRef dict;
UInt32 value ;
CFNumberRef cfValue ;
// create a matching dictionary for AVC units
dict = IOServiceMatching( "IOFireWireAVCUnit" );
// add properties so we only match devices that use the AVC protocol
// add key/value to dictionary to match on Unit_Spec_ID
value = 0x00A02D; // ID for 1394TA -> www.1394ta.org
// create a CFNumber using the value
cfValue = CFNumberCreate( kCFAllocatorDefault, kCFNumberSInt32Type, &value );
// add it to the matching dictionary
CFDictionaryAddValue( dict, CFSTR("Unit_Spec_ID"), cfValue );
// we're done with the CFNumber so release it
CFRelease(cfValue) ;
// add key/value to dictionary to match on Unit_SW_Vers
value = 0x010001; // indicates AV/C protocol
// create a CFNumber using the value
cfValue = CFNumberCreate( kCFAllocatorDefault, kCFNumberSInt32Type, & value );
// add it to the matching dictionary
CFDictionaryAddValue( dict, CFSTR("Unit_SW_Vers"), cfValue );
// we're done with the CFNumber so release it
CFRelease( cfValue );
return( dict );
}</pre>
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