| a36183f6 | 10-Jan-2023 |
Takashi Sakamoto <o-takashi@sakamocchi.jp> |
ALSA: firewire-lib: move parameter for pcm frame multiplier from context payload processing layer
The current implementation delegates the task to calculate the number of
processed PCM frames into t
ALSA: firewire-lib: move parameter for pcm frame multiplier from context payload processing layer
The current implementation delegates the task to calculate the number of
processed PCM frames into the context payload processing layer. It looks
good as long as frame calculation is done for a single purpose.
Nevertheless, another purpose, the computation of extra delay for the
runtime of PCM substream, requires frame calculation, too.
This commit refactors the current implementation so that the packet stream
processing layer is responsible for the calculation of PCM frame, too. The
member is moved to stream structure for multiplier between data block
count and PCM frame count.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20230110134933.322794-2-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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| a9dd8a61 | 30-May-2021 |
Takashi Sakamoto <o-takashi@sakamocchi.jp> |
ALSA: firewire-tascam: perform sequence replay for media clock recovery
This commit takes ALSA firewire-tascam driver to perform sequence replay
for media clock recovery.
The protocol specific to T
ALSA: firewire-tascam: perform sequence replay for media clock recovery
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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| f9e5ecdf | 27-May-2021 |
Takashi Sakamoto <o-takashi@sakamocchi.jp> |
ALSA: firewire-lib: add replay target to cache sequence of packet
In design of audio and music unit in IEEE 1394 bus, feedback of
effective sampling transfer frequency (STF) is delivered by packets
ALSA: firewire-lib: add replay target to cache sequence of packet
In design of audio and music unit in IEEE 1394 bus, feedback of
effective sampling transfer frequency (STF) is delivered by packets
transferred from device. The devices supported by ALSA firewire stack
are categorized to three groups regarding to it.
* Group 1:
* Echo Audio Fireworks board module
* Oxford Semiconductor OXFW971 ASIC
* Digidesign Digi00x family
* Tascam FireWire series
* RME Fireface series
* Group 2:
* BridgeCo. DM1000/DM1100/DM1500 ASICs for BeBoB solution
* TC Applied Technologies DICE ASICs
* Group 3:
* Mark of the Unicord FireWire series
In group 1, the effective STF is determined by the sequence of the number
of events per packet. In group 2, the sequence of presentation timestamp
expressed in syt field of CIP header is interpreted as well. In group 3,
the presentation timestamp is expressed in source packet header (SPH) of
each data block.
I note that some models doesn't take care of effective STF with large
internal buffer. It's reasonable to name it as group 0:
* Group 0
* Oxford Semiconductor OXFW970 ASIC
The effective STF is known to be slightly different from nominal STF for
all of devices, and to be different between the devices. Furthermore, the
effective STF is known to be shifted for long-period transmission. This
makes it hard for software to satisfy the effective STF when processing
packets to the device.
The effective STF is deterministic as a result of analyzing the batch of
packet transferred from the device. For the analysis, caching the sequence
of parameter in the packet is required.
This commit adds an option so that AMDTP domain structure takes AMDTP
stream structure to cache the sequence of parameters in packet transferred
from the device. The parameters are offset ticks of syt field against the
cycle to receive the packet and the number of data blocks per packet.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210527122611.173711-2-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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| 8070d265 | 21-May-2021 |
Takashi Sakamoto <o-takashi@sakamocchi.jp> |
ALSA: firewire-lib: add flag to unaware of syt in CIP header
Many devices are unaware of syt field in rx CIP for playback timing.
This commit adds a flag to cancel processing syt field. Actually,
s
ALSA: firewire-lib: add flag to unaware of syt in CIP header
Many devices are unaware of syt field in rx CIP for playback timing.
This commit adds a flag to cancel processing syt field. Actually,
syt calculation is required to decide the number of events per rx packet.
The flag put 0xffff to CIP header of rx packet. On the other hand,
The value of syt field in CIP header of tx packet is unavailable. The
sequence of packet descriptor for tx packet includes 0 for the offset
of syt field to avoid computation.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210522013303.49596-2-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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| 3db1b00f | 10-Mar-2020 |
Jules Irenge <jbi.octave@gmail.com> |
ALSA: firewire-tascam: Add missing annotation for tscm_hwdep_read_locked()
Sparse reports a warning at tscm_hwdep_read_locked()
warning: context imbalance in tscm_hwdep_read_locked() - unexpected u
ALSA: firewire-tascam: Add missing annotation for tscm_hwdep_read_locked()
Sparse reports a warning at tscm_hwdep_read_locked()
warning: context imbalance in tscm_hwdep_read_locked() - unexpected unlock
The root cause is the missing annotation at tscm_hwdep_read_locked()
Add the missing __releases(&tscm->lock) annotation
Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
Acked-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20200311010908.42366-9-jbi.octave@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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| acfedcbe | 18-Oct-2019 |
Takashi Sakamoto <o-takashi@sakamocchi.jp> |
ALSA: firewire-lib: postpone to start IR context
Some devices have a quirk to postpone transmission of isoc packet for
several dozen or hundred isoc cycles since configured to transmit.
Furthermore,
ALSA: firewire-lib: postpone to start IR context
Some devices have a quirk to postpone transmission of isoc packet for
several dozen or hundred isoc cycles since configured to transmit.
Furthermore, some devices have a quirk to transmit isoc packet with
discontinued data of its header.
In 1394 OHCI specification, software allows to start isoc context with
certain isoc cycle. Linux firewire subsystem has kernel API to use it
as well.
This commit uses the functionality of 1394 OHCI controller to handle
the quirks. At present, this feature is convenient to ALSA bebob and
fireface driver. As a result, some devices can be safely handled, as
long as I know:
- MAudio FireWire solo
- MAudio ProFire Lightbridge
- MAudio FireWire 410
- Roland FA-66
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20191018061911.24909-7-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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