DanLeehr

Hello All, I'm pleased to announce a beta test for FLAC Player 1.2.0. If you'd be willing to help test the upcoming version, please send an email to [email protected] and include the following information: Device Type (iPhone 4 / iPad / iPod touch / etc) Software Version (3.2 / 4.3 / 5.0 / etc) Any external DAC or Accessories (AirPlay Speakers, etc) you will be using Device UDID: http://www.innerfence.com/howto/find-iphone-unique-device-identifier-udid This beta includes the following new features: Playlists - support for M3U playlists, also creating and editing playlists within the app Album/Artist browsing - With valid FLAC Metadata, songs are organized by Album and Artist Performance/responsiveness enhancements during importing, artwork browsing, etc. Bug Fixes addressing duplicate directories/collections This beta will install alongside the App Store version of FLAC Player. Regards, Dan http://hammockdistrict.com

@ted_b - Yeah you can use any copy of iTunes to transfer FLACs through USB sharing, doesn't have to be the same computer you normally sync to, and can be Mac or PC. Obviously you'll connect the USB cable. When the device appears in the sidebar, click it and then hit the apps tab. You can still transfer files over, just don't hit the Sync button. @sasaki - Great news on the 192 @Gregor - No I have no plans to develop an Android version.

I'm working on FLAC Player 1.1 and these experimental 24/96 changes will be implemented. That should work out well for iPad users with nice USB DACs. I bought a nuforce uDAC-2 last week, and while it's no match for the gear mentioned here, I'll at least be able to do some basic testing. Thanks very much to Sasaki and everyone else here.

Thanks for the insights, Gordon. I'm approaching this mostly just from a software point-of-view, to see what will get through CoreAudio on the iPad and a USB DAC. I sent a couple beta copies to Sasaki, who had a friend look at the I2S data: " hooked it up with his USB DAC and he extracted I2S signal from the inside of the DAC into his oscilloscope to see I2S analyzing" I've attached the screenshot that shows 24-bit. They indicated this was playing at 24/44.1, but I don't have the original sample to verify that it's bit-perfect.

Well a full development environment isn't absolutely necessary. While I'm not even sure iOS supports 24-bit, it's certainly worth testing a couple things. So here's what I'm suggesting: If you have a DAC that can 1. handle 24-bit 2. works with iPad/iPhone/iPod 3. can confirm that it's actually decoding/outputting 24-bit I would like to send you a modified version of FLAC Player. Please email your device's UDID and a brief description of your DAC/amplifier hardware to [email protected] and I'll get a copy sent out in a few days. It would be good to confirm 96KHz too, but sounds like that's not an issue. Info for getting the UDID from your device is available here: http://www.innerfence.com/howto/find-iphone-unique-device-identifier-udid. Serious testers only please.

Yes it was Sasaki's email that I was recalling. This is a good discussion and I'm glad it's coming up - actually I am doing some bit padding in the current implementation. Without going too deep, after each sample is decoded I hand it off to the Audio Queue. For LPCM I can use a 16-bit format or a 32-bit format. The audio system would not accept audio if I specified the format was 24-bit. So...In the case of 24-bit audio I'm populating a 32-bit sample, and shifting the 24-bits up, leaving the 8 LSBs empty. If I recall correctly from development, NOT shifting these resulted in very quiet audio, (since the 8 most significant bits in the sample were always empty). But I'd certainly be willing to remove this shift and see if we can't get true 24-bit out. Of course, during the format specification my only choices appear to be 16-bit or 32-bit, so I don't know if this will help or not. Two questions for the audiophiles here: 1. Can someone recommend a reasonably inexpensive DAC I can use to test this? I really just want to be able to test if it's true 96/24. 2. Those of you with DACs for iPhone/iPad, would you be willing to help test a build of FLAC Player for the above One final note - I'm working on enabling EQ settings for the next major release, and this will require changing some of the APIs I'm using to play audio, so the constraints/requirements may be different in the future.