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In callback function of isochronous context, u32 variable is passed for cycle count. The value of this variable comes from DMA descriptors of 1394 Open Host Controller Interface (1394 OHCI). In the specification, DMA descriptors transport lower 3 bits for second field and full cycle field in 16 bits field, therefore 16 bits of the u32 variable are available. The value for second is modulo 8, and the value for cycle is modulo 8,000. Currently, ALSA firewire-lib module don't use the value of the second field, because the value is useless to calculate presentation timestamp in IEC 61883-6. However, the value may be useful for debugging. In later commit, it will be printed with the other parameters for debugging. This commit makes this module to handle the whole cycle count including second. The value is calculated by cycle unit. The existed code is already written with ignoring the value of second, thus this commit causes no issues. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de> |
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| bebob | ||
| dice | ||
| digi00x | ||
| fireworks | ||
| oxfw | ||
| tascam | ||
| amdtp-am824.c | ||
| amdtp-am824.h | ||
| amdtp-stream.c | ||
| amdtp-stream.h | ||
| cmp.c | ||
| cmp.h | ||
| fcp.c | ||
| fcp.h | ||
| isight.c | ||
| iso-resources.c | ||
| iso-resources.h | ||
| Kconfig | ||
| lib.c | ||
| lib.h | ||
| Makefile | ||
| packets-buffer.c | ||
| packets-buffer.h | ||