Hi Mike, Yes, you need to increase the baud rate, chanding bit pool value will not help you definately. Ideally high quality A2DP audio data needs 320-350Kbps of band width. For running this you would need baud-rate of 460.8Kbps which will run basic audio(80% audio data) for you, but i would suggest you to use 921.6Kbps.
Changing the baud-rate will depend platform you are using. In BlueZ baud-rate is configured using hciattach tool during bluetooth on process. hciattach has platform specific code which does the vendor specific initialization and baud-rate change. By the way which platform are you working on? I am not sure hci0 up would work, i will verify and come back to you. If you are working on source code you can check in hciattach, whether it is possible or not. And intial configuration for hciattach is taken from init.trout.rc, you can set the configuration in there. On Nov 11, 7:08 am, Mike <mikebro...@gmail.com> wrote: > Hi All, > I am working on the eclair code base. And I just started enabling > BlueZ and started working on it. > The basic profiles seems to be working fine. But When I play media on > my headset there is a time delay oocured when playing the media on > headset and hence after 2 seconds of play it stops for 2 seconds and > plays again. > During this process I saw error message "a2dp_write failed err: -110". > > 1-01 00:09:48.980: INFO/AudioHardwareALSA(1991): Initialized ALSA > PLAYBACK device AndroidPlayback_Speaker_normal > 01-01 00:09:48.980: DEBUG/AudioHardwareALSA(1991): Set PLAYBACK PCM > format to S16_LE (Signed 16 bit Little Endian) > 01-01 00:09:48.985: DEBUG/AudioHardwareALSA(1991): Using 2 channels > for PLAYBACK. > 01-01 00:09:48.985: DEBUG/A2DP(1991): ********** a2dp_write ********** > 01-01 00:09:48.990: DEBUG/A2DP(1991): bluetooth_start > 01-01 00:09:49.000: DEBUG/AudioHardwareALSA(1991): Set PLAYBACK sample > rate to 44100 HZ > 01-01 00:09:49.000: DEBUG/AudioHardwareALSA(1991): Buffer size: 4096 > 01-01 00:09:49.000: DEBUG/AudioHardwareALSA(1991): Latency: 92879 > 01-01 00:09:49.080: INFO/vold(3225): Android Volume Daemon version 2.0 > 01-01 00:09:49.465: WARN/AudioFlinger(1991): OutputTrack::write() > 0x23cc0 no more overflow buffers > 01-01 00:09:49.490: DEBUG/A2DP(1991): wait_for_start: 500575 us > 01-01 00:09:49.490: ERROR/A2dpAudioInterface(1991): a2dp_write failed > err: -110 > 01-01 00:09:49.500: WARN/AudioFlinger(1991): write blocked for 512 > msecs, thread 0x23658 > 01-01 00:09:49.500: DEBUG/A2DP(1991): ********** a2dp_write ********** > 01-01 00:09:49.705: WARN/AudioFlinger(1991): OutputTrack::write() > 0x23cc0 no more overflow buffers > 01-01 00:09:49.820: WARN/AudioFlinger(1991): OutputTrack::write() > 0x23cc0 no more overflow buffers > 01-01 00:09:49.930: DEBUG/A2DP(1991): Received BT_RESPONSE - > BT_START_STREAM > 01-01 00:09:49.930: DEBUG/A2DP(1991): Received BT_RESPONSE - > BT_NEW_STREAM > 01-01 00:09:49.930: DEBUG/A2DP(1991): wait_for_start: 431150 us > 01-01 00:09:49.930: DEBUG/A2DP(1991): poll: 20 us > 01-01 00:09:49.930: DEBUG/A2DP(1991): send: 189 us > 01-01 00:09:49.930: DEBUG/A2DP(1991): avdtp_write: 297 us > > I tried reducing the bitpool till 20 and tried but I did not see any > variation in the performance. > As of now I am using the Baud rate of 115200 should I increase the > baud rate. > If yes please let me know how can I do that since hciconfig hci0 up is > not working with baud rate more than 115200. > waiting for ur reply guys > Thnaks in Advance! -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting
