Looks like there is bug in Android code for BLOCKING OFFLOAD mode causing a
crash when offload output is closed.
void AudioFlinger::OffloadThread::threadLoop_exit()
{
if (mFlushPending || mHwPaused) {
// If a flush is pending or track was paused, just discard buffered
data
flushHw_l();
} else {
mMixerStatus = MIXER_DRAIN_ALL;
threadLoop_drain();
}
mCallbackThread->exit(); *// For BLOCKING mode mCallbackThread is NULL*
PlaybackThread::threadLoop_exit();
}
On Tuesday, November 5, 2013 8:59:00 AM UTC-8, Eric Laurent wrote:
>
> The pause, resume, drain and flush APIs are only called by audioflinger
> for offloaded output streams.
> There is no need to implement them for other HALs.
>
> Your understanding on switching to/from offload mode is correct.
>
>
>
> On Monday, November 4, 2013 11:54:51 AM UTC-8, Uday Gupta wrote:
>>
>> Hi Glenn,
>>
>> Thanks for the reply. I have couple of more questions.
>>
>> In my understanding, there is build in support for switching from HW
>> codec to SW codec for different use cases like
>>
>> 1. If the effects are turned ON but the effects are not offloaded.
>> 2. If the device switches to a device not supported by the offloaded
>> codec output.
>>
>> Thanks
>> Uday
>>
>> On Monday, November 4, 2013 11:35:59 AM UTC-8, Glenn Kasten wrote:
>>>
>>> After syncing AOSP branch android-4.4_r1, look at these projects and
>>> files:
>>> hardware/libhardware/include/hardware/audio*.h
>>> hardware/qcom/audio/
>>> device/lge/hammerhead/audio*.conf
>>> Do a git log on these, and look especially at CLs with the words
>>> "offload" or "tunnel".
>>> I think the new APIs are intended for the offload stream only.
>>>
>>> On Saturday, November 2, 2013 1:29:49 PM UTC-7, Uday Gupta wrote:
>>>>
>>>> Hi,
>>>>
>>>> Is there an example of sample code and audio_policy.xml for
>>>> supporting Audio Codec Offload support in Kitkat.
>>>>
>>>> Also can the newly added API's for audio_stream_out like pause, resume
>>>> drain and flush be used by other HALS like primary or deep buffer.
>>>>
>>>> Thanks.
>>>>
>>>
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