Lines Matching refs:FE

45 modem. This sound card exposes 4 DSP front end (FE) ALSA PCM devices and
46 supports 6 back end (BE) DAIs. Each FE PCM can digitally route audio data to any
47 of the BE DAIs. The FE PCM devices can also route audio to more than 1 BE DAI.
115  1) Define the FE and BE DAI links.
117  2) Define any FE/BE PCM operations.
122 1 FE and BE DAI links
141 For the example above we have to define 4 FE DAI links and 6 BE DAI links. The
142 FE DAI links are defined as follows :-
156 	.....< other FE and BE DAI links here >
159 This FE DAI link is pretty similar to a regular DAI link except that we also
160 set the DAI link to a DPCM FE with the "dynamic = 1". The supported FE stream
163 each FE. This allows the ASoC core to trigger the DSP before or after the other
167 The FE DAI above sets the codec and code DAIs to dummy devices since the BE is
173 	.....< FE DAI links here >
223 2 FE/BE PCM operations
228 FE hw params. i.e. the DSP may perform SRC or ASRC from the FE to BE.
230 e.g. DSP converts all FE hw params to run at fixed rate of 48k, 16bit, stereo for
231 DAI0. This means all FE hw_params have to be fixed in the machine driver for
232 DAI0 so that the DAI is running at desired configuration regardless of the FE
243 	/* The DSP will covert the FE rate to 48k, stereo */
278  2) DAPM graph showing DSP audio routing from FE DAIs to BEs.
330  2) Hostless FE. This FE has a virtual connection to the BE DAI links on the DAPM
331     graph. Control is then carried out by the FE as regular PCM operations.
371 Hostless FE
374 The DAI link(s) are enabled by a FE that does not read or write any PCM data.
375 This means creating a new FE that is connected with a virtual path to both
376 DAI links. The DAI links will be started when the FE PCM is started and stopped
377 when the FE PCM is stopped. Note that the FE PCM cannot read or write data in