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This commit takes ALSA firewire-tascam driver to perform sequence replay for media clock recovery. The protocol specific to Tascam FireWire series is not compliant to IEC 61883-1/6 in terms of syt field of CIP. The protocol doesn't use presentation time in received CIP for playback timing. The sequence of the number of data blocks per packet is important for media clock recovery. Although the devices in Tascam FireWire series transfer packets regardless of receiving packets, the tx packets includes no events in the beginning of streaming. It takes so long to multiplex any event into the packet after receiving the sequence of packets. As long as I experienced, it takes several thousands of isochronous cycle. Furthermore, just after changing sampling transmission frequency, it stops multiplexing event at once, then starts multiplexing again. The sequence replay is tested with below models: * FW-1884 * FW-1804 * FW-1082 Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20210531025103.17880-6-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de> |
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| .. | ||
| amdtp-tascam.c | ||
| Makefile | ||
| tascam-hwdep.c | ||
| tascam-midi.c | ||
| tascam-pcm.c | ||
| tascam-proc.c | ||
| tascam-stream.c | ||
| tascam-transaction.c | ||
| tascam.c | ||
| tascam.h | ||