Non-PRI_NEW_SET_API logging callbacks were only available in libpri-1.0 and older,
which also lacks PRI_IO_FUNCS (required) and wouldn't work anyway.
Explicitly check for both PRI_* feature defines at configure time and reject libpri
versions that lack them.
Remove the non-PRI_NEW_SET_API logging callbacks in ftmod_libpri.c.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>
Use the PRI_NEW_SET_API define provided by >=libpri-1.2 to distinguish
between old style and new style pri_set_error() and pri_set_message()
callback functions.
Improve message logging by using ftdm_log_chan() if per-span
data with a valid (d-)channel object is available.
NOTE: pri_get_userdata() returns NULL if pri is NULL.
This will reduce the horizontal space for libpri output a bit, but allows
us to see which span the message/error came from.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>
Timer-based b-channel tx gating won't work anyway, so remove all those
"#if 0"-ed bits of cruft.
Also remove the mISDN-specific timerfd_create() check in configure.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>
Re-bootstrapping is needed after this change. Previously CentOS 5
systems wouldn't build correctly without this file in tree, but we've
adjusted bootstrap to compensate.
Thanks to Phil Zimmermann for the code and for the license exception
we needed to include it.
There remains some build system integration work to be done before
this code will build properly in the FreeSWITCH tree.
Use the amount of audio data received in misdn_read() to determine how many
bytes we need to send to the b-channel (= how much free space is left
in the b-channel tx queue). (This is how libosmo-abis and LCR handle it too.)
A pipe is used as a poll()-able audio tx buffer (filled in misdn_write()):
FTDM_WRITE wait requests are currently poll()-ed on the input side of the pipe,
whereas FTDM_READ and _EVENT requests are poll()-ed on the b-channel socket itself.
For every N-bytes of audio data read from the b-channel in misdn_read(),
we try to get as much out of the tx pipe, convert it into the ISDN_P_B_RAW
format and send it to the b-channel socket.
If there's less than N-bytes left in the pipe, we fill the remaining buffer
with silence to avoid buffer underflows.
B-Channel handling overview:
- misdn_wait(FTDM_WRITE) on audio pipe
- misdn_write() put audio data into pipe
- misdn_wait(FTDM_READ) for next incoming mISDN
message on b-channel socket
- misdn_read() handle mISDN event, for PH_DATA_IND:
- Write data into channel buffer and convert
to a/u-law using misdn_convert_audio_bits()
- Try to fetch N-bytes from audio pipe
- If not enough bytes in pipe: fill remaining space with silence
- Convert audio to raw format
- Send to b-channel (PH_DATA_REQ)
Known problems / bugs / further investigation:
1. Bridge aborted by "Write Buffer 0 bytes Failed!" error from switch_core_io.c.
This is "fixed" by _not_ setting the b-channel sockfd to non-blocking mode.
2. Audio glitches (maybe caused by FTDM_WRITE misdn_wait() handling or blocking I/O on sockfd?)
3. misdn_read() EBUSY error messages from sending data to b-channel sockfd after enabling channel.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>
