[vlc] USB Audio Dongle compatibility when playing with some FLAC file
SDML L.M.Wong SZ
lmwong at sz.cn.speeddragon.com
Wed Jun 23 16:32:26 CEST 2010
To VideoLan support team
Dear Sir or Madam,
USB Audio Dongle compatibility when playing with some FLAC file
I am L.M. Wong, the R&D manager at Speed Dragon Multimedia Ltd. We are a manufacturer and exporter of computer peripherals manufacturer based in Hong Kong. Recently we develop a USB stero dongle based on VIA VT1620A. But I found out VLC Media Player for Windows has problem with some USB audio devices when playing FLAC file. Below is my findings on different kinds of media player and USB audio devices:
Symptom: There is random silence of about 0.2 second happen on both L/R channels during FLAC file playback.
Operating System: Windows XP SP3 Simplified Chinese
USB audio devices tested with the same FLAC file played by VLC Media Player v1.1.0:
a.. CMedia CM119 demo board - OK
b.. CMedia CM108 demo board - OK
c.. CMedia HS100 demo board - OK
d.. VIA VT1620A demo board - FAILED
e.. Creative Audigy2 NX - FAILED
f.. Roland UA-1G - FAILED
Audio files tested with VLC Media Player v1.1.0 and different kinds of USB audio devices lsited above:
a.. MP3 - OK
b.. APE - OK
c.. WAV (PCM) - OK
d.. FLAC - FAILED
Media player we tested with the same FLAC file played by different kinds of USB audio devices listed above:
a.. Kugou 2010 (¿á¹·) v6.117 Build 6.1.17.393 - OK
b.. Foobar 2000 v1.0.3 - OK
c.. Songbird v1.7.3 Build 1700 - OK
d.. Real Player - OK
e.. TTPlayer 5.6 (ǧǧ¾²Ìý) - OK
f.. VLC Media Player v1.1.0 - FAILED
Conclusion:
a.. VLC Media Player's FLAC decoder produces the 0.2 second silence issue when working with a USB audio device supporting high sampling rate (higher than 48Khz).
I am a die-hard fans of VLC, please let me know what I can do to assist you on debugging. Attachment is the VIA VT1620A datasheet for your reference.
Regards,
L.M. Wong
Speed Dragon Multimedia Ltd
--------------------------------------------------------------------------------
----- Original Message -----
From: SDML L.M.Wong SZ
To: RoyalChuang at viatech.com.cn ; jim at lpdpsz.com.cn
Cc: wuquan at sz.cn.speeddragon.com ; IceriverXu at viatech.com.cn ; ken at lpdpsz.com.cn ; SonicZhang at viatech.com.cn ; AlexCChen at via.com.tw
Sent: Saturday, June 12, 2010 2:21 PM
Subject: Re: VT1620A оƬÑùÆ·
Hi Royal,
×òÍíÎÒÃÇÓü¸¸öFLACÎļþ²âÊÔ¹ýÏÂÃ漸¿î²¥·ÅÆ÷£¬½á¹ûÈçÏ£º
a.. ¿á¹·ÒôÀÖ2010 v6.117 Build 6.1.17.393 - OK
b.. Foobar 2000 v1.0.3 - OK
c.. Songbird v1.7.3 Build 1700 - OK
d.. VLC Media Player v1.0.5 - NG£¬ËùÓÐFLACÎļþ¶¼³öÏÖ¼äЪͣ¶ÙÎÊÌâ
ÓÃFoolbar 2000¼ì²éÏÂÃæµÄFLACÎļþÊôÐÔ£¬È¡ÑùÂÊ(Sampling rate)ÊÇ44100Hz£¬È¡Ñù·Ö±æÂÊ(Bits per sample)ÊÇ16-bit£¬Ã¿Ê×ÎÞËðѹËõÎļþµÄµÄÂëÂÊ(bit rate)´ó¸ÅÊÇ750Kbps~892Kbps£¬ÓÉÓÚÎļþÊÇ´ÓÆÕͨµÄDVD/CD³éÈ¡³öÀ´ÔÙѹËõ³ÉFLAC£¬ËùÒÔÈ¡ÑùÂʺͷֱæÂʾø¶ÔÊǹ̶¨µÄ44100Hz * 16-bit¡£
a.. êû - êûÏã¸ÛÑݳª•þ2007 - 03. ×îÛÊÇÕl.flac
b.. êû - êûÏã¸ÛÑݳª•þ2007 - 04. Çé·ÇµÃÒÑ.flac
c.. êû - êûÏã¸ÛÑݳª•þ2007 - 04. Ò°º¢×Ó.flac
d.. êû - êûÏã¸ÛÑݳª•þ2007 - 09. Óšâ.flac
e.. Jazz Lounge - Vol. 1 (Disc 1).FLAC
f.. Jazz Lounge - Vol. 1 (Disc 2).FLAC
ÎÒÔÙÓÿṷ¡¢Foobar¡¢VLC²¥·ÅÆäËû¸ñʽµÄÒôƵÎļþ£¨Songbird²»Ö§³ÖAPE£©£º
a.. WAV¸ñʽ£ºThe Best of David Benoid£¨PCM±àÂ룬ÂëÂÊ1411Kbps£© - OK
b.. APE¸ñʽ£ºAV SHOW 2005 Hong Kong£¨APE±àÂ룬ÂëÂÊ500Kbps~788Kbps£©- OK
ËùÒÔ£¬ËƺõVLC×Ô´øµÄFLAC½âÂëÆ÷Ö»¸úÖ§³Ö¸ßÈ¡ÑùÂʵÄUSB audio deviceÓмæÈÝÐÔÎÊÌâ¡£
----- Original Message -----
From: RoyalChuang at viatech.com.cn
To: lmwong at sz.cn.speeddragon.com ; jim at lpdpsz.com.cn
Cc: wuquan at sz.cn.speeddragon.com ; IceriverXu at viatech.com.cn ; ken at lpdpsz.com.cn ; SonicZhang at viatech.com.cn ; AlexCChen at via.com.tw
Sent: Thursday, June 10, 2010 6:47 PM
Subject: RE: VT1620A оƬÑùÆ·
Dear L.M.:
ÎÒ‚ƒÄ¿Ç°Ê¹ÓÃµÄ Ç§Ç§ìo ,Real play,¶¼›]ÓÐß@‚€¬FÏó°lÉú
Äã¿ÉÒÔÕˆÄゃ¹¤³ÌŽŸÔ‡Ô‡¿´
BR
RoyalChuang Çfºëí®
ÍþÊ¢ëŠ×ӹɷݹ«Ë¾
VIA Technologieh INC.,LTD
TEL:86-755-33630666-6226
FAX:86-755-33630688
ZIP:518057
E-Mail:RoyalChuang at viatech.com.cn
Http://www.via.com.tw
----------------------------------------------------------------------------
From: SDML L.M.Wong SZ [mailto:lmwong at sz.cn.speeddragon.com]
Sent: Wednesday, June 09, 2010 7:37 PM
To: Royal Chuang; jim at lpdpsz.com.cn
Cc: wuquan at sz.cn.speeddragon.com; Iceriver Xu; ken at lpdpsz.com.cn; Sonic Zhang; Alex C. Chen
Subject: Re: VT1620A оƬÑùÆ·
Royal,
Ã÷°×£¬ÓÐûÓÐÈκÎÒ»¿î²¥·ÅÆ÷ÔÚ¸ßbit-rateµÄÇé¿öÏÂͨ¹ýUSB 2.0 Full-Speed É豸ʱ²»»á·¢ÉúÍ£¶ÙÏÖÏó£¿ÓеĻ°»¹ºÃ£¬¿É¶Ô¿Í»§ËµÊÇVLCµÄÎÊÌâ¡£
Ã÷ÌìÉîÛÚ¹«Ë¾Í£µç£¬ºóÌìÎâȪ»áÕÒһЩ²¥·ÅÆ÷²âÊÔһϡ£
Ming
----- Original Message -----
From: RoyalChuang at viatech.com.cn
To: lmwong at sz.cn.speeddragon.com ; jim at lpdpsz.com.cn
Cc: wuquan at sz.cn.speeddragon.com ; IceriverXu at viatech.com.cn ; ken at lpdpsz.com.cn ; SonicZhang at viatech.com.cn ; AlexCChen at via.com.tw
Sent: Wednesday, June 09, 2010 7:20 PM
Subject: RE: VT1620A оƬÑùÆ·
Dear L.M.:
Œ¦ì¶VLC²¥·ÅÆ÷ÕýÔÚ²¥·ÅµÄʱºòͻȻ·¢ÁËÒ»¶ÎÁãÊý¾Ý£¬ËùÒÔ¶ÙÁËÒ»ÏÂ,Õâ¸öÎÊÌâ½›ß^ÎÒÃÇRDœyÔ‡áḴÏÖÕâ¸öÏÖÏóÈÏΪÓëVLC²¥·ÅÆ÷µÄ¹ØϵºÜ´ó¡£
ÓÉÓÚflacÊÇÎÞËðÒôÀÖ¸ñʽ£¬ÔÚXPÏ»áÑ¡ÔñdeviceÖ§³ÖµÄ×î¸ßsample rate£¬ËùÒÔ¶ÔÓÚ1620A£¬»á°´ÕÕ192kHz²¥·Å¡£
Òò´Ë¶ÔÓÚsample rate³¬¹ý48khzµÄplayback£¬VLC player Ÿo·¨²¥·Å,ËùÒÔUSB busÉÏÃæ»á·¢ËÍÒ»¶ÎÁãÊý¾Ý£¬Ò²¾ÍÊÇ˵´ÓPC·¢Ë͵½µÄdeviceµÄÊý¾Ý¾ÍÒѾ·¢ÉúÁËÍ£¶Ù£¬ËùÒÔ1620²¥·Å³öÀ´×ÔȻҲ»áÍ£¶Ù¡£
ÎÒÃÇÍƲ⣬VLC playerÖ»ÄÜÖ§³Öµ½×î¸ß48khz sample rate¡£
ΪÁËÑéÖ¤ÕâÒ»µã£¬ÎÒÃÇRD±È½ÏÁËÊÖ±ßÁ½¸ö½Ï¸ß¶ËµÄusb audio device£º
Creative Audigy2 NX£¬×î¸ß¿ÉÒÔÖ§³Ö96khz£¬²¥·ÅÒ²³öÏÖÍ£¶Ù¡£
Roland UA-1G£¬×î¸ß¿ÉÒÔÖ§³Ö96khz£¬²¥·ÅÒ²³öÏÖÍ£¶Ù¡£
ÑéÖ¤VIA chip£º
1610£¬ ×î¸ß48khz£¬²¥·ÅûÓÐÎÊÌâ¡£
1620A£¬ÐÞ¸ÄFW£¬×î¸ßÖ§³Ö48khz£¬²¥·ÅûÓÐÎÊÌâ¡£
1728A+HD codec£¬Èç¹ûFW×î¸ßÖ§³Ö48khz£¬²¥·ÅûÎÊÌâ¡£×î¸ßÖ§³Ö192khz£¬²¥·ÅÓÐÍ£¶Ù¡£
1731£¬×î¸ßÖ§³Ö192khz£¬USB High speed£¬VIA driver¡£²¥·Å³öÏÖÍ£¶Ù¡£
¶ÔÓÚÙF¹«Ë¾Ìáµ½µÄÁ½¸öchip£¬
CM 119Ö»Ö§³Ö×î¸ß16bit¡¢48khz£»
HS 100ûÓв鵽datasheet£¬°´ÄúµÄÃèÊöÊôÓÚ±ÈCM 119¸üµÍ¶ËµÄchip£¬
ËùÒÔ¹æ¸ñÓ¦¸Ã²»»á¸ßÓÚCM119¡£Òò´ËCM119 & HS100²¥·ÅÓ¦¸ÃÊÇûÓÐÎÊÌâµÄ¡£
Any question let me know Please!!
TKS!!
RoyalChuang Çfºëí®
ÍþÊ¢ëŠ×ӹɷݹ«Ë¾
VIA Technologieh INC.,LTD
TEL:86-755-33630666-6226
FAX:86-755-33630688
ZIP:518057
E-Mail:RoyalChuang at viatech.com.cn
Http://www.via.com.tw
--------------------------------------------------------------------------
From: Royal Chuang
Sent: Tuesday, June 08, 2010 9:19 AM
To: 'SDML L.M.Wong SZ'; jim at lpdpsz.com.cn
Cc: wuquan at sz.cn.speeddragon.com; Iceriver Xu; ken at lpdpsz.com.cn; Sonic Zhang
Subject: RE: VT1620A оƬÑùÆ·
Dear L.M:
ºÜ±§Ç¸!
Òòžéß@Ž×ÌìÎÒ¶¼ÔÚÍâÃæ,ÎÒ½ñÌìÕˆÎÒ‚ƒµÄ¹¤³ÌŽŸsonicß^ȥһͬ¿´†–î}
ÈçÓІ–î}ÕˆÅcÎÒ“ÀM
TKS!!
RoyalChuang Çfºëí®
ÍþÊ¢ëŠ×ӹɷݹ«Ë¾
VIA Technologieh INC.,LTD
TEL:86-755-33630666-6226
FAX:86-755-33630688
ZIP:518057
E-Mail:RoyalChuang at viatech.com.cn
Http://www.via.com.tw
--------------------------------------------------------------------------
From: SDML L.M.Wong SZ [mailto:lmwong at sz.cn.speeddragon.com]
Sent: Monday, June 07, 2010 7:13 PM
To: Royal Chuang; jim at lpdpsz.com.cn
Cc: wuquan at sz.cn.speeddragon.com; Iceriver Xu; ken at lpdpsz.com.cn
Subject: Re: VT1620A оƬÑùÆ·
Importance: High
Hi Royal (13923420475),
ÕýÈçÎÒ֮ǰËù˵£¬ÎÒÊÖÉϵÄVIA demo¶¼ÓÐͬÑùÎÊÌ⣬ÎÊÌâÓ¦²»ÔÚlayout designÉÏ¡£
¿É·ñ°ÑÄã˵ûÎÊÌâµÄdemo card´ø¹ýÀ´ÎÒÃǹ«Ë¾£¬Ò»Æð¿´¿´ÎÊÌâÕâÑù»á¿ì½ÝÒ»µã£¿
¸½¼þÊÇÎÒÃǵİå×Ó(UVT1620-A1)µÄÔÀíͼºÍPCB GerberÎļþ¡£
Ming
----- Original Message -----
From: RoyalChuang at viatech.com.cn
To: jim at lpdpsz.com.cn ; lmwong at sz.cn.speeddragon.com
Cc: wuquan at sz.cn.speeddragon.com ; IceriverXu at viatech.com.cn ; ken at lpdpsz.com.cn
Sent: Friday, June 04, 2010 3:21 PM
Subject: RE: VT1620A оƬÑùÆ·
Dear L.M:
ÎÒ‚ƒœyÔ‡ÊÖÉϵÄdemo card ›]Óаl¬FÈçÙF¹«Ë¾°lÉúµÄÖДà¬FÏó
²»ÖªÊÇ·ñ·½±ãÌṩÙF¹«Ë¾µÄ°å×ÓœyÔ‡,¼°SCH check
Any question let me know
TKS!!
BR
RoyalChuang Çfºëí®
ÍþÊ¢ëŠ×ӹɷݹ«Ë¾
VIA Technologieh INC.,LTD
TEL:86-755-33630666-6226
FAX:86-755-33630688
ZIP:518057
E-Mail:RoyalChuang at viatech.com.cn
Http://www.via.com.tw
------------------------------------------------------------------------
From: jim [mailto:jim at lpdpsz.com.cn]
Sent: Friday, June 04, 2010 9:13 AM
To: 'SDML L.M.Wong SZ'
Cc: wuquan at sz.cn.speeddragon.com; Iceriver Xu; ken at lpdpsz.com.cn; Royal Chuang
Subject: RE: VT1620A оƬÑùÆ·
Dear LM
ÄÜ·ñÏÈÌṩSCH½oVIA Fae´_ÕJ???
Èç¹û·½±ãµÄÕˆ°ÑÙF¹«Ë¾ÔOÓ‹µÄSch¼Ä½oRoyal,ÈôÓÐÆäËûµÄ†–î},Ո׌ÎÒÖªµÀ,ÖxÖx
Thanks & Best regards
Jim_Yeh È~Ö¾ã‘
D-Plus LTD
Ê¢ß_ëŠ(Ïã¸Û)ÓÐÏÞ¹«Ë¾ /Ê¢ß_ëŠ(ÉîÛÚ)ÓÐÏÞ¹«Ë¾
Cell Phone: 13823588033
TEL:0755-8202-1301 EXT:802
FAX:0755-82879454
µØÖ·:ÉîÛÚÊÐÄϺþ·3005Ì– ‡øÙQÉ̘I´óB9˜ÇHÌ–
E-mail : jim at lpdpsz.com.cn
------------------------------------------------------------------------
From: SDML L.M.Wong SZ [mailto:lmwong at sz.cn.speeddragon.com]
Sent: Tuesday, June 01, 2010 6:57 PM
To: jim
Cc: wuquan at sz.cn.speeddragon.com; IceriverXu at viatech.com.cn; ken at lpdpsz.com.cn
Subject: Re: VT1620A оƬÑùÆ·
Hi Jim,
¸½Í¼£¬ÎÒÃÇÒ»¿ÚÆø×öÁËÈý¿îÐÂPCB£º VT1620A, CM119, HS100¡£
¶Ô±È¹ýVT1620AµÄÑÝʾ°æºÍÎÒÃÇ×öµÄ£¬·¢ÏÖ²¥·ÅÒôÀÖʱ£¬Í¬ÑùÓÐÉùÒôÖжÏÏÖÏó£¬Ã¿¸ô30Ãëµ½1·ÖÖÓ²»µÈ¾Í·¢ÉúÒ»´ÎÖжϡ£
Çë¿´¿´ÎÊÌâ³öÔÚÄÄÀ лл£¡
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