On Thu, 23 Jul 2020 15:05:22 +0200, Vinod Koul wrote: > > On 23-07-20, 14:38, Takashi Iwai wrote: > > On Tue, 21 Jul 2020 19:00:01 +0200, > > Srinivas Kandagatla wrote: > > > > > > For gapless playback it is possible that each track can have different > > > codec profile with same decoder, for example we have WMA album, > > > we may have different tracks as WMA v9, WMA v10 and so on > > > Or if DSP's like QDSP have abililty to switch decoders on single stream > > > for each track, then this call could be used to set new codec parameters. > > > > > > Existing code does not allow to change this profile while doing gapless > > > playback. > > > > > > This patchset adds new SNDRV_COMPRESS_SET_CODEC_PARAMS IOCTL along with > > > flags in capablity structure to allow userspace to set this new > > > parameters required which switching codec profile, either for gapless > > > or cross fade usecase. > > > > One idea that came up at the previous audio conference regarding this > > implementation was to just allow SET_PARAMS during the stream is > > running (only if the driver sets the capability) instead of > > introducing yet a new ioctl and an ops. > > Would it make sense? > > That does sound good but only issue would be that we need to somehow > mark/document that buffer info is useless and would be discarded, how do > we do that? Yes, the buffer and no_wake_mode can be ignored in the gapless re-setup. Is your concern only about the documentation? Or something else needs to be changed significantly? It's a new scheme in anyway, so the documentation update is required... thanks, Takashi > > > I have no big objection to add a new ioctl if other people agree, > > though. > > > > > > thanks, > > > > Takashi > > -- > ~Vinod >
