Re: [SlimDevices: Unix] poCorePlayer - DAB+ discussion
stevemartins wrote: > Switching on mobile hotspot every time I get in the car, or buying a GSM > modem and separate sim card account don't seem like great options to me > (or maybe I just like a challenge...). I was thinking more about remote SIMs where the car "borrows" the phone SIM (i.e. no SIM in car) using Bluetooth and then the car can also provide a wifi hotspot within the car. > > https://github.com/hradio/omri-usb is a C library and JNI android > library which is used by DAB-Z as middleware, I'm hoping that porting > that to the pi isn't too difficult, all the java stuff appears just to > be wrapper code to the C functions. OK - good there is open source application for dongle you have. I think you should develop & test on a full Raspbian system - then recompile for PCP. To interface with LMS - I think you should be aiming for a command line which can take parameters to tune (i) if no audio stream then stream audio to STDOUT and feed into LMS. (ii) if standard USB PCM audio stream - use arecord to capture and feed into LMS. (iii) Leave metadata until tuning ans treaming audio is sorted. Metadata can be handled in many ways. If there is a simple PCM audio interface then you'll be able to use "arecord" to test and check. Check the USB device to see if there is a audio interface - use something like "*lsusb -v -d 077d:627a*" Look in the output for "audio" interface that is "streaming". It'll also give the format such as PCM but possibly audio from DABmay not be decoded and may still be in AAC. The lsusb output will say what is supported. Truncated output for a RadioShark USB which has AM/FM audio on audio streaming but tuning and LED control is through a HID. Code: Bus 003 Device 013: ID 077d:627a Griffin Technology Radio SHARK Device Descriptor: bLength18 bDescriptorType 1 bcdUSB 1.10 bDeviceClass0 bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x077d Griffin Technology idProduct 0x627a Radio SHARK bcdDevice0.10 iManufacturer 1 Griffin Technology, Inc. iProduct2 radioSHARK iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 0x00e3 bNumInterfaces 3 bConfigurationValue 1 iConfiguration 3 F5 2006/04/27 17:50 bmAttributes 0x80 (Bus Powered) MaxPower 100mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber0 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 1 Audio bInterfaceSubClass 1 Control Device bInterfaceProtocol 0 iInterface 0 AudioControl Interface Descriptor: bLength 9 bDescriptorType36 bDescriptorSubtype 1 (HEADER) bcdADC 1.00 wTotalLength 0x001e bInCollection 1 baInterfaceNr(0)1 AudioControl Interface Descriptor: bLength12 bDescriptorType36 bDescriptorSubtype 2 (INPUT_TERMINAL) bTerminalID 1 wTerminalType 0x0601 Analog Connector bAssocTerminal 0 bNrChannels 2 wChannelConfig 0x0003 Left Front (L) Right Front (R) iChannelNames 0 iTerminal 0 AudioControl Interface Descriptor: bLength 9 bDescriptorType36 bDescriptorSubtype 3 (OUTPUT_TERMINAL) bTerminalID13 wTerminalType 0x0101 USB Streaming bAssocTerminal 0 bSourceID 1 iTerminal 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber1 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber1 bAlternateSetting 1 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 0 AudioStreaming Interface Descriptor: bLength 7 bDescriptorType36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 13 bDelay 0 frames wFormatTag 0x0001 PCM AudioStreaming Interface Descriptor: bLength14 bDescriptorType36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 1 bSubframeSize 1 bBitResolution 8 bSamFreqType0 Continuous tLowerSamFreq6400 tUpperSamFreq 48000 Endpoint
Re: [SlimDevices: Unix] poCorePlayer - DAB+ discussion
bpa wrote: > While I can see the logic of in-car - just I find it hard to believe > there are roads with a DAB+ signal and not a mobile one. It's just a > word of caution as I think DAB+ may be hard work on a Raspberry Pi. > > Rather than the undocumented USB adaptor you've got you may have better > luck with a RTL-SDR (adaptors are quite cheap 10-20 £/$/) as there is > more open s/w available (e.g. https://github.com/AlbrechtL/welle.io ) > but the downside as it is SDR (it can do any RF not just DAB) but it > requires a good CPU but I believe it is ok on Pi3. Switching on mobile hotspot every time I get in the car, or buying a GSM modem and separate sim card account don't seem like great options to me (or maybe I just like a challenge...). https://github.com/hradio/omri-usb is a C library and JNI android library which is used by DAB-Z as middleware, I'm hoping that porting that to the pi isn't too difficult, all the java stuff appears just to be wrapper code to the C functions. Steve stevemartins's Profile: http://forums.slimdevices.com/member.php?userid=68461 View this thread: http://forums.slimdevices.com/showthread.php?t=114894 ___ unix mailing list unix@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/unix
Re: [SlimDevices: Unix] poCorePlayer - DAB+ discussion
stevemartins wrote: > I'm building a piCorePlayer based in car entertainment platform, DAB > radio would seem to be the right choice for in car, but happy to be > corrected. I don't want to rely purely on a mobile wifi hotspot/on board > music for my radio while driving. > > I can see the device under /sys/bus/usb... and it identifies correctly > under "description", has the control end point... I can't where to hook > the audio from though. It's all just an idea at the minute. While I can see the logic of in-car - just I find it hard to believe there are roads with a DAB+ signal and not a mobile one. It's just a word of caution as I think DAB+ may be hard work on a Raspberry Pi. Rather than the undocumented USB adaptor you've got you may have better luck with a RTL-SDR (adaptors are quite cheap 10-20 £/$/) as there is more open s/w available (e.g. https://github.com/AlbrechtL/welle.io ) but the downside as it is SDR (it can do any RF not just DAB) but it requires a good CPU but I believe it is ok on Pi3. bpa's Profile: http://forums.slimdevices.com/member.php?userid=1806 View this thread: http://forums.slimdevices.com/showthread.php?t=114894 ___ unix mailing list unix@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/unix
Re: [SlimDevices: Unix] poCorePlayer - DAB+ discussion
I'm building a piCorePlayer based in car entertainment platform, DAB radio would seem to be the right choice for in car, but happy to be corrected. I don't want to rely purely on a mobile wifi hotspot/on board music for my radio while driving. I can see the device under /sys/bus/usb... and it identifies correctly under "description", has the control end point... I can't where to hook the audio from though. It's all just an idea at the minute. stevemartins's Profile: http://forums.slimdevices.com/member.php?userid=68461 View this thread: http://forums.slimdevices.com/showthread.php?t=114894 ___ unix mailing list unix@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/unix
Re: [SlimDevices: Unix] poCorePlayer - DAB+ discussion
A few years ago, I did a plugin for RadioShark (an AM/FM dongle) and it had no metadata. A USB device may enumerate but does it provides access to the device controls. For DAB+ support - you'll need access to an interface that provides (i) controls to tune (and maybe scan) (ii) audio and (iii) metadata The standard USB may only provide audio- access to the other control may require a special support application. To work on pcp - this support application is best written in C and C++ (better still Perl but highly unlikely). The basic question is why do you want to implement DAB+ ? DAB+ is losing support because streaming radio over internet (whether wifi or mobile) is more attractive to broadcasters. In Ireland the DAB+ networks have shutdown because of the lack of growth/demand. bpa's Profile: http://forums.slimdevices.com/member.php?userid=1806 View this thread: http://forums.slimdevices.com/showthread.php?t=114894 ___ unix mailing list unix@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/unix
