[pulseaudio-discuss] Rate/Timing issues when streaming over BT from iPhone.....

[alex at apics.co.uk]

Hi All,
        Hopefully everyone isn't receiving this twice, I think the first 
one was blocked due to being to large (I've trimmed the output below, 
hopefully not too much though!)

Apologies if this is duplicated.

Alex


Hi All,
        I've setup pulse audio to stream music from my iPhone (connected 
using BlueTooth) and output it, using module-loopback.... This is working 
fine, the only issue I have appears to be related the bitrate/timing 
etc... The music is very crackly, and is playing back too slowly.... I've 
tried changing a number of options, but haven't been able to resolve it. 
I've tried lots of different combinations of the 'rate' option, but none 
helped...  Any help really would be much appreciated, please find debug 
output below, along with the script I'm executing:

Script:
#!/usr/bin/pulseaudio -vvvnF
load-module module-alsa-sink device=default:CARD=Live sink_name=output 
rate=48000
load-module module-bluetooth-device address="XX:XX:XX:XX:XX:XX" 
path="/org/bluez/1662/hci0/dev_XX_XX_XX_XX_XX_XX" profile="a2dp_source" 
auto_connect=yes name=input rate=44100
load-module module-loopback source=1 sink=0 rate=44100

Partial output:
I: main.c: Daemon startup complete.
I: module-loopback.c: Loopback overall latency is 100.04 ms + 0.00 ms + 
39.51 ms = 139.55 ms
I: module-loopback.c: Should buffer 35280 bytes, buffered at minimum 0 
bytes
I: module-loopback.c: Old rate 44100 Hz, new rate 43218 Hz
D: bluetooth-util.c: dbus: interface=org.bluez.AudioSource, 
path=/org/bluez/1662/hci0/dev_64_B9_E8_19_DD_FA, member=PropertyChanged
D: module-bluetooth-device.c: dbus: interface=org.bluez.AudioSource, 
path=/org/bluez/1662/hci0/dev_64_B9_E8_19_DD_FA, member=PropertyChanged
D: bluetooth-util.c: dbus: interface=org.bluez.AudioSource, 
path=/org/bluez/1662/hci0/dev_64_B9_E8_19_DD_FA, member=PropertyChanged
D: module-bluetooth-device.c: dbus: interface=org.bluez.AudioSource, 
path=/org/bluez/1662/hci0/dev_64_B9_E8_19_DD_FA, member=PropertyChanged
I: main.c: Got signal SIGUSR2.
I: module.c: Loaded "module-cli-protocol-unix" (index: #3; argument: "").
I: module-loopback.c: Loopback overall latency is 99.98 ms + 0.00 ms + 
39.51 ms = 139.49 ms
I: module-loopback.c: Should buffer 34576 bytes, buffered at minimum 0 
bytes
I: module-loopback.c: Old rate 43218 Hz, new rate 43236 Hz
I: client.c: Created 0 "UNIX socket client"
D: bluetooth-util.c: dbus: interface=org.bluez.AudioSource, 
path=/org/bluez/1662/hci0/dev_64_B9_E8_19_DD_FA, member=PropertyChanged
D: module-bluetooth-device.c: dbus: interface=org.bluez.AudioSource, 
path=/org/bluez/1662/hci0/dev_64_B9_E8_19_DD_FA, member=PropertyChanged
I: module-loopback.c: Loopback overall latency is 99.99 ms + 400.66 ms + 
42.02 ms = 542.67 ms
I: module-loopback.c: Should buffer 34592 bytes, buffered at minimum 2560 
bytes
I: module-loopback.c: Old rate 43236 Hz, new rate 43300 Hz
I: module-loopback.c: Loopback overall latency is 99.98 ms + 806.05 ms + 
39.69 ms = 945.71 ms
I: module-loopback.c: Should buffer 34640 bytes, buffered at minimum 69240 
bytes
I: module-loopback.c: Old rate 43300 Hz, new rate 44965 Hz
I: module-loopback.c: Loopback overall latency is 99.98 ms + 781.78 ms + 
40.83 ms = 922.60 ms
I: module-loopback.c: Should buffer 35976 bytes, buffered at minimum 
134708 bytes
I: module-loopback.c: Old rate 44965 Hz, new rate 46568 Hz
I: module-loopback.c: Loopback overall latency is 99.98 ms + 429.80 ms + 
40.62 ms = 570.40 ms
I: module-loopback.c: Should buffer 37256 bytes, buffered at minimum 79028 
bytes
I: module-loopback.c: Old rate 46568 Hz, new rate 45144 Hz
I: module-loopback.c: Loopback overall latency is 100.00 ms + 409.27 ms + 
41.85 ms = 551.11 ms
I: module-loopback.c: Should buffer 36120 bytes, buffered at minimum 73904 
bytes
I: module-loopback.c: Old rate 45144 Hz, new rate 45044 Hz
I: main.c: Daemon shutdown initiated.

Thanks in advance

Alex

alex at apics.co.uk

Homer Simpson: Facts are meaningless. You could use facts to prove 
anything that's even remotely true!
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