Hmm, Roger can probably help more than I could. I would of course use the 200-byte max packet size interface setting, which i think you are...do see Roger's email about handling each UsbIrp as it comes back, instead of waiting for them all to return.
Also out of curiousity, you didn't happen to change settings in your javax.usb.properties file did you? :) specifically, queueing settings on iso pipes? Just checking... On Thu, 7 Jul 2005, Charles Chen wrote: >Dan, >I pasted the specifications of my USB device below. And the time for >submitting 40 and 80 Irps are approximately 480 and 960 ms. It looks like 12 >ms is still needed per irp. >I used one of the alternate interface settings, which has IN iso endpoint. >And thanks to your help before, I can submit various audio class requests to >the device to play with the settings of Mute, Volume, Automatic Gain, and >Sampling Frequency. I am not sure what specific settings I have to make to >make iso transfer work? > >Thanks > >Charles > >Bus 002 Device 002: ID 077d:07af Griffin Technology >Device Descriptor: > bLength 18 // Size of the descriptor, in bytes > bDescriptorType 1 // 0x01:DEVICE descriptor; 0x02:CONFIGURATION; > // 0x03:STRING; 0x04:INTERFACE; > 0x05:ENDPOINT; > // 0x24:INTERFACE; 0x25:CS_ENDPOINT(ClassSpecific); > bcdUSB 1.10 // current revision of USB spec > bDeviceClass 0 (Defined at Interface level) // must be zero now > bDeviceSubClass 0 // must be zero now > bDeviceProtocol 0 // must be zero now > bMaxPacketSize0 8 > idVendor 0x077d Griffin Technology > idProduct 0x07af > bcdDevice 0.06 // Device release code > iManufacturer 1 Griffin Technology, Inc > iProduct 2 iMic USB audio system > iSerial 0 > bNumConfigurations 1 > Configuration Descriptor: > bLength 9 > bDescriptorType 2 > wTotalLength 344 > bNumInterfaces 3 > bConfigurationValue 1 // id of this configuration > iConfiguration 3 D3 2003/10/30 09:27 > bmAttributes 0x80 // Bus powered device, not self powered, > // no remote wakeup capability. > MaxPower 100mA > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 0 > bNumEndpoints 0 > bInterfaceClass 1 Audio > bInterfaceSubClass 1 Control Device > bInterfaceProtocol 0 > iInterface 0 > AudioControl Interface Descriptor: > bLength 10 > bDescriptorType 36 > bDescriptorSubtype 1 (HEADER) > bcdADC 1.00 // release of the Audio Device Class > wTotalLength 78 > bInCollection 2 // how many AudioStreaming and >MIDIStreaming > // interfaces there are in the Audio Interface > // Collection to which this AudioControl > // interface belongs > baInterfaceNr( 0) 1 // this array contains the interface >numbers > baInterfaceNr( 1) 2 // of all the streaming interfaces in the > // collection > AudioControl Interface Descriptor: > bLength 12 > bDescriptorType 36 > bDescriptorSubtype 2 (INPUT_TERMINAL) // 0x01:HEADER/GENERAL; > // 0x02:INPUT_TERMINAL/FORMAT_TYPE; > // 0x03:OUTPUT_TERMINAL; > // 0x05:SELECTOR_UNIT > bTerminalID 12 // uniquely identifying the Terminal >within > // the audio function. this value is used in > // all requests to address this terminal > wTerminalType 0x0101 USB Streaming > bAssocTerminal 11 // ID of the output terminal to which this > // input terminal is associated > bNrChannels 2 > wChannelConfig 0x0003 // specify the spatial positions > Left Front (L) > Right Front (R) > iChannelNames 0 // if one or more channels have >non-predefined > // spatial positions, their location > description > // can optionally be derived from this field > iTerminal 0 // index of a string descriptor, >describing the > // input terminal > AudioControl Interface Descriptor: > bLength 13 > bDescriptorType 36 > bDescriptorSubtype 6 (FEATURE_UNIT) // the feature unit (FU) is > // essentially a multi-channel processing > unit that > // provides basic manupulation of the incoming > // logical channels. > bUnitID 1 > bSourceID 12 // indicates to which other Unit or >Terminal > // this unit or terminal is connected. > bControlSize 2 // number of bytes occupied by each >element > // of the bmaControls > bmaControls( 0) 0x55 // this array indicates the availability >of > bmaControls( 1) 0x01 // certain audio controls for a specific > // logical channel or for the master channel 0 > // A bit set to 1 indicates that the mentioned > // control is supported for master channel 0: > // D0:Mute;D1:Volume;D2:Bass;D3:Mid;D4:Treble > // D5:Graphic Equalizer;D6:Automatic Gain > // D7:Delay;D8:Bass Boost;D9:Loudness > Mute > Bass > Treble > Automatic Gain > Bass Boost > bmaControls( 0) 0x02 > bmaControls( 1) 0x00 > Volume > bmaControls( 0) 0x02 > bmaControls( 1) 0x00 > Volume > iFeature 0 > AudioControl Interface Descriptor: > bLength 9 > bDescriptorType 36 > bDescriptorSubtype 3 (OUTPUT_TERMINAL) > bTerminalID 14 > wTerminalType 0x0301 Speaker // 0x0201:Microphone; >0x0301:Speaker; > bAssocTerminal 0 > bSourceID 1 > iTerminal 0 > AudioControl Interface Descriptor: > bLength 12 > bDescriptorType 36 > bDescriptorSubtype 2 (INPUT_TERMINAL) > bTerminalID 11 > wTerminalType 0x0201 Microphone > bAssocTerminal 12 > bNrChannels 2 > wChannelConfig 0x0003 > Left Front (L) > Right Front (R) > iChannelNames 0 > iTerminal 0 > AudioControl Interface Descriptor: // this the the feature unit for >microphone > bLength 13 > bDescriptorType 36 > bDescriptorSubtype 6 (FEATURE_UNIT) > bUnitID 6 > bSourceID 11 > bControlSize 2 > bmaControls( 0) 0x03 > bmaControls( 1) 0x00 > Mute > Volume > bmaControls( 0) 0x00 > bmaControls( 1) 0x00 > bmaControls( 0) 0x00 > bmaControls( 1) 0x00 > iFeature 0 > AudioControl Interface Descriptor: > bLength 9 > bDescriptorType 36 > bDescriptorSubtype 3 (OUTPUT_TERMINAL) > bTerminalID 13 > wTerminalType 0x0101 USB Streaming > bAssocTerminal 0 > bSourceID 6 > iTerminal 0 > Interface Descriptor: // this is the default interface setting, with >zero band > // width. > bLength 9 > bDescriptorType 4 > bInterfaceNumber 1 > bAlternateSetting 0 > bNumEndpoints 0 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > Interface Descriptor: // this the operating interface setting. > bLength 9 > bDescriptorType 4 > bInterfaceNumber 1 > bAlternateSetting 1 > bNumEndpoints 1 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > AudioControl Interface Descriptor: > bLength 7 > bDescriptorType 36 > bDescriptorSubtype 1 (AS_GENERAL) > bTerminalLink 12 // contains the unique terminal id of the >input > // or output terminal to which this interface > is > // connected. 12 here is the input termainal, > // associated to microphone > bDelay 0 frames // a measure for the delay that is >introduced > // in the audio data stream due to internal > // processing of the signal within the audio > // function > wFormatTag 1 PCM // it holds information about the >Audio Data > // Format that should be used when > communicating > // with this interface > AudioControl Interface Descriptor: > bLength 14 > bDescriptorType 36 > bDescriptorSubtype 2 (FORMAT_TYPE) > bFormatType 1 (FORMAT_TYPE_I) > bNrChannels 1 > bSubframeSize 2 // bytes per audio subframe > bBitResolution 16 // bits per sample > bSamFreqType 0 Continuous > tLowerSamFreq 6400 > tUpperSamFreq 48000 > Endpoint Descriptor: > bLength 9 > bDescriptorType 5 > bEndpointAddress 0x01 EP 1 OUT > bmAttributes 9 > Transfer Type Isochronous > Synch Type Adaptive > Usage Type Data > wMaxPacketSize 0x0064 bytes 100 once > bInterval 1 > bRefresh 0 > bSynchAddress 0 > AudioControl Endpoint Descriptor: > bLength 7 > bDescriptorType 37 > bDescriptorSubtype 1 (EP_GENERAL) > bmAttributes 0x01 > Sampling Frequency > bLockDelayUnits 2 Decoded PCM samples > wLockDelay 1 Decoded PCM samples > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 1 > bAlternateSetting 2 > bNumEndpoints 1 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > AudioControl Interface Descriptor: > bLength 7 > bDescriptorType 36 > bDescriptorSubtype 1 (AS_GENERAL) > bTerminalLink 12 > bDelay 0 frames > wFormatTag 1 PCM > AudioControl Interface Descriptor: > bLength 14 > bDescriptorType 36 > bDescriptorSubtype 2 (FORMAT_TYPE) > bFormatType 1 (FORMAT_TYPE_I) > bNrChannels 2 > bSubframeSize 2 > bBitResolution 16 > bSamFreqType 0 Continuous > tLowerSamFreq 6400 > tUpperSamFreq 48000 > Endpoint Descriptor: > bLength 9 > bDescriptorType 5 > bEndpointAddress 0x01 EP 1 OUT > bmAttributes 9 > Transfer Type Isochronous > Synch Type Adaptive > Usage Type Data > wMaxPacketSize 0x00c8 bytes 200 once > bInterval 1 > bRefresh 0 > bSynchAddress 0 > AudioControl Endpoint Descriptor: > bLength 7 > bDescriptorType 37 > bDescriptorSubtype 1 (EP_GENERAL) > bmAttributes 0x01 > Sampling Frequency > bLockDelayUnits 2 Decoded PCM samples > wLockDelay 1 Decoded PCM samples > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 2 > bAlternateSetting 0 > bNumEndpoints 0 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 2 > bAlternateSetting 1 > bNumEndpoints 1 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > AudioControl Interface Descriptor: > bLength 7 > bDescriptorType 36 > bDescriptorSubtype 1 (AS_GENERAL) > bTerminalLink 13 > bDelay 0 frames > wFormatTag 1 PCM > AudioControl Interface Descriptor: > bLength 14 > bDescriptorType 36 > bDescriptorSubtype 2 (FORMAT_TYPE) > bFormatType 1 (FORMAT_TYPE_I) > bNrChannels 1 > bSubframeSize 1 > bBitResolution 8 > bSamFreqType 0 Continuous > tLowerSamFreq 6400 > tUpperSamFreq 48000 > Endpoint Descriptor: > bLength 9 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 9 > Transfer Type Isochronous > Synch Type Adaptive > Usage Type Data > wMaxPacketSize 0x0032 bytes 50 once // 50 bytes (25 two-byte >samples) > bInterval 1 > bRefresh 0 > bSynchAddress 0 > AudioControl Endpoint Descriptor: > bLength 7 > bDescriptorType 37 > bDescriptorSubtype 1 (EP_GENERAL) > bmAttributes 0x01 // support sampling frequency, not pitch > Sampling Frequency > bLockDelayUnits 2 Decoded PCM samples // units used for >wLockDelay > wLockDelay 1 Decoded PCM samples // the time it takes >this > // endpoint to reliably lock its internal > clock > // recovery circuitry. > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 2 > bAlternateSetting 2 > bNumEndpoints 1 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > AudioControl Interface Descriptor: > bLength 7 > bDescriptorType 36 > bDescriptorSubtype 1 (AS_GENERAL) > bTerminalLink 13 > bDelay 0 frames > wFormatTag 1 PCM > AudioControl Interface Descriptor: > bLength 14 > bDescriptorType 36 > bDescriptorSubtype 2 (FORMAT_TYPE) > bFormatType 1 (FORMAT_TYPE_I) > bNrChannels 1 > bSubframeSize 2 > bBitResolution 16 > bSamFreqType 0 Continuous > tLowerSamFreq 6400 > tUpperSamFreq 48000 > Endpoint Descriptor: > bLength 9 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 9 > Transfer Type Isochronous > Synch Type Adaptive > Usage Type Data > wMaxPacketSize 0x0064 bytes 100 once > bInterval 1 // inverval for polling endpoint for data >transfers > // expressed in milliseconds. Must be set to > 1. > bRefresh 0 > bSynchAddress 0 // must be set to 0. > AudioControl Endpoint Descriptor: > bLength 7 > bDescriptorType 37 > bDescriptorSubtype 1 (EP_GENERAL) > bmAttributes 0x01 > Sampling Frequency > bLockDelayUnits 2 Decoded PCM samples > wLockDelay 1 Decoded PCM samples > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 2 > bAlternateSetting 3 > bNumEndpoints 1 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > AudioControl Interface Descriptor: > bLength 7 > bDescriptorType 36 > bDescriptorSubtype 1 (AS_GENERAL) > bTerminalLink 13 > bDelay 0 frames > wFormatTag 1 PCM > AudioControl Interface Descriptor: > bLength 14 > bDescriptorType 36 > bDescriptorSubtype 2 (FORMAT_TYPE) > bFormatType 1 (FORMAT_TYPE_I) > bNrChannels 2 > bSubframeSize 2 > bBitResolution 16 > bSamFreqType 0 Continuous > tLowerSamFreq 6400 > tUpperSamFreq 48000 > Endpoint Descriptor: > bLength 9 > bDescriptorType 5 > bEndpointAddress 0x84 EP 4 IN > bmAttributes 9 > Transfer Type Isochronous > Synch Type Adaptive > Usage Type Data > wMaxPacketSize 0x00c8 bytes 200 once > bInterval 1 > bRefresh 0 > bSynchAddress 0 > AudioControl Endpoint Descriptor: > bLength 7 > bDescriptorType 37 > bDescriptorSubtype 1 (EP_GENERAL) > bmAttributes 0x01 > Sampling Frequency > bLockDelayUnits 2 Decoded PCM samples > wLockDelay 1 Decoded PCM samples > Language IDs: (length=4) > 0409 English(US) > >_________________________________________________________________ >Is your PC infected? 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