On Wed, 02 May 2018 12:16:38 +0200, Takashi Sakamoto wrote: > > Hi, > > This patchset updates my previous one: > > [PATCH v2 00/11] ALSA: dice: use cache of stream formats to generate PCM rules/constraints > http://mailman.alsa-project.org/pipermail/alsa-devel/2018-April/135330.html > > Once, ALSA dice driver cached stream formats to generate PCM > constraints/rules. The cache is created by changing current > sampling transmission frequency step by step directly at unit > probing process. This feature was dropped because it changes > state of clock on target device thus it's against users' > expectation[1]. > > However this is not necessarily convenient because reconfiguration > of sampling rate is not available. > > TC Applied Technologies (TCAT) has extended protocol for DICE > interface, a.k.a EAP (Extended Application Protocol). In this > extension, drivers can retrieve information of stream formats > without changing state of target unit. Fortunately, this protocol > is supported widely by many models. > > This patchset regain the cache to generate PCM constraints/rules > by using this protocol. Userspace applications can reconfigure > sampling rate via ALSA PCM interface. > > For units which doesn't support the extension, available set of > sampling rate is still restricted at current sampling transmission > frequency. This is also inconvenient and this patchset introduces a > solution. > > Structure for unit entry (struct ieee1394_device_id) has a member > for unit-specific data. This patchset uses it for callback function > to handle hard-coded stream format. In this time, I adopt this way > for some known models produced by TC Electronic and Alesis. If users > find their models still have restrictions in a point of available > sampling transmission frequency, it's preferable to work for this > way. > > Changes from v2: > - use robust representation to calcurate mode of sampling > transmission frequency. > > [1] [PATCH 0/6 v2] ALSA: dice: constrain PCM substreams to current sampling transfer frequency > http://mailman.alsa-project.org/pipermail/alsa-devel/2016-February/104065.html > > Takashi Sakamoto (13): > ALSA: dice: add cache of stream formats > ALSA: dice: add 'firewire' directory for proc nodes > ALSA: dice: add proc node for stream formation > ALSA: dice: cache stream formats at current mode of sampling > transmission frequency > ALSA: dice: add parameters of stream formats for models produced by TC > Electronic > ALSA: dice: add parameters of stream formats for models produced by > Alesis > ALSA: dice: use extended protocol to detect available stream formats > ALSA: dice: use cache of stream format to check running stream > ALSA: dice: add a helper function to restart all of available streams > ALSA: dice: enable to change current sampling transmission frequency > ALSA: dice: use stream formats to add MIDI substreams > ALSA: dice: use cache for PCM constraints and rules > ALSA: dice: remove local frag of force_two_pcms Applied all patches now. Thanks. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
