On Friday, 18 May 2018 04:54:01 CEST Takashi Sakamoto wrote: > Hi, > > On May 18 2018 04:00, Melvin Vermeeren wrote: > > Mytek manufactures some equipment with DICE-based firewire ports. These > > devices contain old versions of DICE firmware which lacks detailed > > stream format reporting for all sampling clock modes. > > > > Building upon the recent work by Takashi Sakamoto, hard-coded parameters > > are added for the Stereo 192 DSD-DAC. When the device vendor and model > > match the coded parameters are copied into the stream format cache. > > > > Signed-off-by: Melvin Vermeeren <mail@xxxxxxx> > > -- SNIP -- > > From me, some supplements. In Mytek website, we can get firmwares for > some models with interfaces for IEEE 1394 bus. > > * Professional: https://mytekdigital.com/professional/support/ > * Stereo192-DSD-DAC: > https://mytekdigital.com/support_docs/Mytek_Stereo192DSD%20DAC_firmware.zip > * 8x192ADDA DIO FW: > https://mytekdigital.com/download_library/DioFWDiceMini3001.bin > * HiFi: https://mytekdigital.com/hifi/support/ > * Manhattan DAC (Original model): > https://mytekdigital.com/support_docs/Mytek_ManhattanDAC_firmware_v1.1.1.zip > * Stereo192-DSD-DAC: > https://mytekdigital.com/support_docs/Mytek_Stereo192DSD%20DAC_firmware.zip > > When executing strings(1) to these firmwares, we can see below line: > > For Stereo192-DSD-DAC: > ``` > * Mytek Stereo192DA on DICE Mini (TCD2210) * > ``` > > For original Manhattan DAC: > ``` > * Mytek Stereo192DA on DICE Mini (TCD2210) * > ``` > (I note that the line includes different name.) > > For 8x192ADDA DIO FW: > ``` > * Mytek 8x192ADDA DioFW on DICE Mini (TCD2210) * > ``` > > It's reasonable that we judge TCD2210 (a.k.a. Dice mini) ASIC used for > Mytek models. Old firmwares were not released for this ASIC, thus your > patch comment is not proper. The reason for this patch is that this > model doesn't support extended protocol, which I've addressed at a > commit commit 58579c056c1c ('ALSA: dice: use extended protocol to detect > available stream formats'). Thank you for the details, I hadn't looked into the hardware side of things with this depth. I had assumed that the lack of reporting would be due to old firmware like with other models. > Furthermore, for 8x192ADDA DIO FW, the firmware includes below > line: > > ``` > * EAP is supported. * > ``` > > I believe ALSA Dice driver can detect stream formats correctly for > this model. Thus, the rest of piece may be for original Manhattan DAC. It could be that the Manhattan does support EAP, it is quite a bit newer than the Stereo 192 DSD-DAC. Though at the same time, a lot of the internals are the same as in the 192. > I note that all of Dice based devices utilizes Embedded Configurable > Operating System(eCos)[1], and these firmwares are designed for eCos. > IMHO, the firmwares can be parsed by format of eCos but I have never > attempted it, > > From my curious, can you drive your model with DSD samples? If so, what > kind of software do you use? With lintweaker's out-of-tree USB 2.0 driver[1] it works with DoP. Due to latency requirements and reliability I always run over firewire however. I did some basic attempts to get it working from userspace, but I think it is not possible with the current snd_dice. As for the player, I believe there are several that support it. So far I have been using MPD, which has native DSD playback[2][3]. I did attempt something cheap to see what would happen: #define AM824_IN_PCM_FORMAT_BITS SNDRV_PCM_FMTBIT_S32 #define AM824_OUT_PCM_FORMAT_BITS SNDRV_PCM_FMTBIT_S32 For these two, I appended "| SNDRV_PCM_FMTBIT_DSD_U32_LE" and some other variants. MPD then refuses to play because: alsa_output: opened hw:DAC,0 type=HW alsa_output: buffer: size=1792..4096 time=10158..23220 alsa_output: period: size=896..2048 time=5079..11610 alsa_output: default period_time = buffer_time/4 = 23219/4 = 5804 alsa_output: format=DSD_U32_LE (Direct Stream Digital, 4-byte (x32), little endian, oldest bits in MSB) alsa_output: buffer_size=4096 period_size=1024 output: opened "mpd_alsa_out" (alsa) audio_format=dsd128:4 exception: Failed to convert for "mpd_alsa_out" (alsa) exception: nested: PCM conversion from f to dsd is not implemented output: Retrying without DSD alsa_output: opened hw:DAC,0 type=HW alsa_output: buffer: size=1920..4096 time=10000..21334 alsa_output: period: size=960..2048 time=5000..10667 alsa_output: default period_time = buffer_time/4 = 21333/4 = 5333 alsa_output: format=S32_LE (Signed 32 bit Little Endian) alsa_output: buffer_size=4096 period_size=1024 output: opened "mpd_alsa_out" (alsa) audio_format=192000:32:4 libsamplerate: setting samplerate conversion ratio to 0.27 output: converting in=dsd128:2 -> f=dsd128:2 -> out=192000:32:4 I am pretty sure this happens because the DSD128 file is 2 channels, and MPD sees the output in 4 channels. It does exactly the same for DSD64. I am not sure how this should be handled since the channels are not actually for 4.0 audio. Possibly need to expose it is a 2-channel device and in the driver use PCM-L,PCM-R or DSD-L,DSD-R depending on the input. Could be the unit works a bit differently then this, I will ask Mytek. In the meanwhile, do you have any suggestions for things I could experiment with? I am not very familiar with the ALSA tree (yet). Meanwhile I will try to look in MPD source code for a bit, if I could set channel mappings there that might solve it too. By the way, it seems that currently native 16-bit and 24-bit PCM formats are not supported since it always locks to 32-bit. I remember the "old", 2016, DICE driver did support 16-bit to my DAC, not sure about 24-bit. I am curious to why the new design is fixed to 32-bit, do you perhaps know? [1] https://github.com/lintweaker/mytekusb2 [2] https://www.musicpd.org/doc/user/dsd.html [3] https://github.com/MusicPlayerDaemon/MPD/blob/master/NEWS Thank you, Melvin Vermeeren
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