snd_seq_create_ump_block() receives a snd_ump_block_info_t data at the
creation of a FB and updates its associated sequencer port, but it
handled the port direction incorrectly. The UMP / port direction
means the connectivity, but the current code translated other way
round. The correct translation should be that input = receiver, i.e.
a writable port for applications, and output = source, a readable port
for applications.
This patch corrects the translation, and add more comments to the
direction definition.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
For making it easer for applications to create a virtual UMP Endpoint
and UMP blocks, add two API helper functions.
snd_seq_create_ump_endpoint() creates (unsurprisingly) a UMP Endpoint,
based on the given snd_ump_endpoint_info_t information. The number of
(max) UMP groups belonging to this Endpoint has to be specified.
This function sets up the Endpoint info on the sequencer client, and
creates a MIDI 2.0 UMP port as well as UMP Group ports automatically.
The name of the sequencer client is updated from the Endpoint name,
too.
After creating a UMP Endpoint, create each UMP Block via
snd_seq_create_ump_block() function with a snd_ump_block_info_t info.
The associated groups for each block have to be specified there.
The port names and capability bits are updated accordingly after
setting each block information.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
config.h may contain defines like _FILE_OFFSET_BITS which influence
the system wide include files (off_t types, open -> open64 function
usage etc.).
Fixes: ad3a8b8b ("reshuffle included files to include config.h as first")
Related: https://github.com/alsa-project/alsa-lib/pull/333
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This patch adds the basic support of UMP on ALSA sequencer API.
An extended event type, snd_seq_ump_event_t, is defined. It's
compatible with the existing type, snd_seq_event_t, but it has a
larger payload of 16 bytes instead of 12 bytes, for holding the full
128bit UMP packet.
The new snd_seq_ump_event_t must have the bit SND_SEQ_EVENT_UMP in the
event flags.
A few new API functions have been added such as
snd_seq_ump_event_output() and snd_seq_ump_event_input() for
reading/writing this new event object.
The support of UMP in the sequencer client is switched by the function
snd_seq_client_set_midi_version(). It can switch from the default
legacy MIDI to UMP MIDI 1.0 or 2.0 on the fly.
The automatic event conversion among UMP and legacy clients can be
suppressed via snd_seq_client_set_ump_conversion().
The inquiry of the associated UMP Endpoints and UMP Blocks can be done
via snd_seq_get_ump_endpoint_info() and snd_seq_get_ump_block_info().
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Commit 1989233449 (seq: Fix for snd_seq_parse_address()) removed the
ability to match sequencer client names by any of by their prefixes in
an attempt to avoid wrong matches when one client name is the prefix of
another.
However, the prefix match feature was documented and actually used.
Allow prefixes to match, but only if there is no exact match.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
snd_seq_parse_address() uses strncmp() to compare the client name
in the string argument with the existing clients, until it finds one
name matching the same leading characters. This may produce wrong
results when there are two sequencer clients with similar names.
Example: "KMidimon" : "Kmid"
Signed-off-by: Pedro Lopez-Cabanillas <pedro.lopez.cabanillas@gmail.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
The sequencer API is totally recoded with the style of "encapsulation"
in other api.
The structure becomes opaque and accessed only via functions.
Other changes:
- There is no longer group in client and port info.
- snd_seq_query_subs_t is renamed to snd_seq_query_subscribe_t.
- snd_seq_delete_port takes only the port id argument instead of
port_info structure.
- snd_seq_input/output_buffer_size are renamed
as snd_seq_get_input/output_buffer_size.
Similarly snd_seq_resize_input/output_buffer are renamed as
snd_seq_set_input/output_buffer_size.
- snd_seq_get_named_queue is renamed to snd_seq_query_named_queue.
- Sync codes are removed temporarily from API.
- Subscription conditions are accessed via the corresponding functions.
convert_time is named now as time_update.
- snd_seq_get/set_queue_owner are removed.
Use snd_seq_get/set_queue_info instead.
- Instrument put/get/remove structure is unified as snd_instr_header_t.
They are half-automated output from the 0.5.x documents.
The sequencer API will be changed in near future
to suit with encapsulation implemented already in pcm api,
so do not trust the comments added here..
They are just for reference.
- dead SMP lock in es1968 (maestro2) driver.
Bugfix & enhances of sequencer stuff
by Scott McNab <sdm@fractalgraphics.com.au>:
- fix for the insrument list locking in SND_SEQ_EVENT_INSTR_BEGIN
and SND_SEQ_EVENT_INSTR_END events.
Note that nothing seems to really take notice of the list locking.
This is more an issue when we add support for editing instruments
anyway.
- added new alsa-lib utility function snd_seq_ev_set_varusr() which
is similar to snd_seq_ev_set_variable(), but specifies userspace
extended event data.
This is required in order to use the SND_SEQ_EVENT_INSTR_PUT
command (took me bloody ages to work this out btw)
- minor correction for gus & trident synth drivers
Wed, 22 Dec 1999 15:51:37 +0100
Changes in alsa-driver:
1. SND_SEQ_DEST_DIRECT was removed. For direct dispatching, specify
the scheduling queue as SND_SEQ_QUEUE_DIRECT.
Source compatibility is kept if alsa-lib functions are used to set
or check direct mode.
Tested: pmidi, playmidi1, aconnect, aseqview, OSS emulation
2. The error event can be bounced to the sender as an encapsulated
event with SND_SEQ_EVENT_BOUNCE type. If the orignal event is
variable length (like SYSEX), the data body is added after the
copied event data. (To access to it, use
snd_seq_event_bounce_ext_data() macro.)
This feature is enabled only when the sender is opened with read
flag and has a client-filter flag SND_SEQ_FILTER_BOUNCE, so that
as default it is disabled.
3. Maximum size of VARIABLE length event is defined as 2048 bytes.
Larger events will be refused.
Note that this is not the size of VARUSR nor VARIPC event.
4. Return error code was revised.
Possible errors for read():
-ENXIO invalid client or file open mode
-ENOSPC FIFO overflow (the flag is cleared after this error report)
-EINVAL no enough user-space buffer to write the whole event
-EFAULT seg. fault during copy to user space
Possible errors for write():
-ENXIO invalid client or file open mode
-ENOMEM malloc failed
-EFAULT seg. fault during copy from user space
-EINVAL invalid event
-EAGAIN no space in output pool
-EINTR interrupts while sleep
-EMLINK too many hops
others depends on return value from driver event_input callback
Changes in alsa-lib:
5. Behavior of snd_seq_flush_output() was changed.
It flushes data in output buffer as much as possible. This has
two advantages. One is that most data can be sent at one call,
and another is that the error in write() can be detected directly
from this function.
The demerit of this implementation is that in non-blocking mode, it
tries twice write() even if write pool of sequencer is full, which
is not actually error. In this case, flush_output() always returns
-EAGAIN error code.
After an error is detected (except for -EAGAIN in non-blocking
mode), you should remove the error event via
snd_seq_extract_output() as below. Otherwise, it'll remain in
output buffer and cause the same error again.
6. Some functions were added:
snd_seq_exract_output(seq, &event)
This extracts the first event on *output* buffer. This will
be useful to know (and remove) the event which causes error in
write().
snd_seq_event_input_pending(seq, fetch)
Retunrs the number of events on input buffer.
If no events exist in input buffer, it fetches from sequencer
(only when flag is true).
snd_seq_event_input_selective(seq, &ev, type, blocking)
Retrieve the event from input with the given event type.
If blocking is true, it waits until the target event is
received. It'll be useful for checking bounced error or
waiting for hand-shake results (eg. loading insruments).
Fri, 17 Sep 1999 17:24:43 +0200
OK, the attached is the patch to alsa-driver and alsa-lib.
It will really violate the source/binary compatibility as
I wrote :-p
It includes:
- change of event data for accessing Timer Port
- new middle-level functions for sequencer in alsa-lib
- some comments / fixes
The test programs in alsa-lib (playmidi1, aconnect, aseqnet)
were rewritten to use the new functions above.
I included also a patch to pmidi-1.2.2.
