Microphone not working about meta-smartwatch

[MagneFire]

Finally! I have a fix for this!
I was testing mic functionality on sturgeon and noticed that the logcat shows some info regarding the audio hardware. Looking back at this issue I noticed that I didn't look into the logcat output. Looking at this again, revealed that nothing related to audio hardware was showing up!

This made me think that the audio backend is using the default libraries. On hybris devices the *.smelt.so is preferred over *.default.so. *.msm8226.so is generally ignored. Looking at the libraries we can see that there are indeed two different audio.primary and audio.a2dp libraries.

root@smelt:/system/lib/hw# ls -la
drwxr-xr-x    2 root     root          4096 Jan 31 13:59 .
drwxr-xr-x    4 root     root         12288 Jan 23 18:29 ..
-rw-r--r--    1 root     root         22144 Jan 23 18:29 audio.a2dp.default.so
-rw-r--r--    1 root     root         34472 Jan 23 18:29 audio.a2dp.msm8226.so
-rw-r--r--    1 root     root         18048 Jan 23 18:29 audio.primary.default.so
-rw-r--r--    1 root     root         75012 Jan 23 18:29 audio.primary.msm8226.so
-rw-r--r--    1 root     root         91952 Jan 23 18:29 audio_policy.default.so
-rw-r--r--    1 root     root       1329828 Jan 23 18:29 bluetooth.default.so
-rw-r--r--    1 root     root         30336 Jan 23 18:29 copybit.msm8226.so
-rw-r--r--    1 root     root         22476 Jan 23 18:29 gralloc.default.so
-rw-r--r--    1 root     root         26772 Jan 23 18:29 gralloc.msm8226.so
lrwxrwxrwx    1 root     root            55 Jan 23 18:29 gralloc.smelt.so -> /usr/libexec/hal-droid/system/lib/hw/gralloc.msm8226.so
-rw-r--r--    1 root     root        132816 Jan 23 18:29 hwcomposer.msm8226.so
lrwxrwxrwx    1 root     root            58 Jan 23 18:29 hwcomposer.smelt.so -> /usr/libexec/hal-droid/system/lib/hw/hwcomposer.msm8226.so
-rw-r--r--    1 root     root         13872 Jan 23 18:29 keystore.default.so
-rw-r--r--    1 root     root         18048 Jan 23 18:29 lights.msm8226.so
-rw-r--r--    1 root     root         13952 Jan 23 18:29 local_time.default.so
-rw-r--r--    1 root     root         13972 Jan 23 18:29 memtrack.msm8226.so
lrwxrwxrwx    1 root     root            56 Jan 23 18:29 memtrack.smelt.so -> /usr/libexec/hal-droid/system/lib/hw/memtrack.msm8226.so
-rw-r--r--    1 root     root         13964 Jan 23 18:29 power.default.so
-rw-r--r--    1 root     root         13964 Jan 23 18:29 power.smelt.so
-rw-r--r--    1 root     root         71360 Jan 23 18:29 sensors.smelt.so

So the first thing to do is symlink the audio.primary.smelt.so to audio.primary.msm8226.so. Followed by the audio.a2dp one.
And now we can see that something is happening in logcat!

01-31 14:00:56.841   767   767 D audio_hw_primary: adev_open: enter
01-31 14:00:56.852   767   767 V msm8974_platform: platform_init: snd_card_name: msm8226-snd-card
01-31 14:00:56.852   767   767 V msm8974_platform: platform_is_i2s_ext_modem, is_i2s_ext_modem:0
01-31 14:00:56.874   767   767 D msm8974_platform: platform_init: Opened sound card:0
01-31 14:00:56.878   767   767 V msm8974_platform: platform_init: DLOPEN successful for libacdbloader.so
01-31 14:00:56.880   767   767 E ACDB-LOADER: ACDB -> No .acdb files found in /etc!
01-31 14:00:56.880   767   767 E ACDB-LOADER: ACDB -> Error: Could not open any directory! Failed for /etc
01-31 14:00:56.880   767   767 E ACDB-LOADER: ACDB -> Could not load .acdb files!
01-31 14:00:56.880   767   767 D platform_info: platform_info_init: Failed to open /system/etc/audio_platform_info.xml, using defaults.
01-31 14:00:56.880   767   767 V msm8974_platform: platform_send_audio_calibration: sending audio calibration for snd_device(65) acdb_id(34)
01-31 14:00:56.880   767   767 E ACDB-LOADER: ACDB -> Not correctly initialized!
01-31 14:00:56.901   767   767 D audio_hw_primary: out_set_parameters: enter: usecase(0: deep-buffer-playback) kvpairs: routing=2;

Though when recording still no sound is actually recorded, only complete silence. Now looking back into the pulseaudio logs. The following line appears:

I: [pulseaudio] droid-source.c: Create new droid-source
I: [pulseaudio] droid-source.c: FIXME: Setting AUDIO_DEVICE_IN_BUILTIN_MIC as initial device.
D: [pulseaudio] droid-util.c: Set global input to AUDIO_DEVICE_IN_BUILTIN_MIC (0x80000004)
D: [pulseaudio] droid-util.c: set global audio source to mic (0x00000001)
D: [pulseaudio] droid-util.c: Fill config: Try to use format AUDIO_FORMAT_PCM_16_BIT, sample rate 44100
D: [pulseaudio] droid-util.c: Destroy input stream 0x9bb258
E: [pulseaudio] droid-source.c: Failed to open input stream.
I: [pulseaudio] card.c: Created 0 "droid_card.primary"

Failed to open input stream! pulse-audio-droid actually configures the audio routing using a audio_policy.conf config file:

D: [pulseaudio] config-parser-legacy.c: config: New module: primary
D: [pulseaudio] config-parser-legacy.c: config: primary: New output: primary
D: [pulseaudio] config-parser-legacy.c: config: primary: New input: primary
D: [pulseaudio] config-parser-legacy.c: config: New module: a2dp
D: [pulseaudio] config-parser-legacy.c: config: a2dp: New output: a2dp_primary
D: [pulseaudio] config-parser-legacy.c: config: a2dp: New output: a2dp_offload
I: [pulseaudio] config-parser-legacy.c: Parsed config file (/system/etc/audio_policy.conf): 2 modules.

I know that sturgeon and smelt are similar in hardware, so I just copied the audio_policy.conf file from sturgeon to smelt. The log is different now:

I: [pulseaudio] droid-source.c: Create new droid-source
I: [pulseaudio] droid-source.c: FIXME: Setting AUDIO_DEVICE_IN_BUILTIN_MIC as initial device.
D: [pulseaudio] droid-util.c: Set global input to AUDIO_DEVICE_IN_BUILTIN_MIC (0x80000004)
D: [pulseaudio] droid-util.c: set global audio source to mic (0x00000001)
D: [pulseaudio] droid-util.c: Fill config: Try to use format AUDIO_FORMAT_PCM_16_BIT, sample rate 44100
I: [pulseaudio] droid-util.c: Trying to open input stream with device: 0x80000004 source: 0x00000001 flags: 0000000000 sample rate: 44100 (44100) channels: 1 (0x00000010) format: 3 (0x00000001) (return code 0)
I: [pulseaudio] droid-util.c: Opened input stream with device: 0x80000004 source: 0x00000001 flags: 0000000000 sample rate: 44100 (44100) channels: 1 (0x00000010) format: 3 (0x00000001) (return code 0)
D: [pulseaudio] droid-util.c: input stream 0x10593e0 set_parameters(routing=-2147483644;input_source=1) 0x80000004 ; 0x00000001
D: [pulseaudio] droid-util.c: Opened input stream 0x10593e0
I: [pulseaudio] droid-util.c: Set active input to 0x10593e0
D: [pulseaudio] droid-util.c: Ports for input: droid
D: [pulseaudio] droid-util.c:   Port input-builtin_mic from cache
D: [pulseaudio] droid-util.c:   Port input-default from cache
D: [pulseaudio] droid-util.c:   Port input-parking from cache
I: [pulseaudio] source.c: Created source 1 "source.droid" with sample spec s16le 1ch 44100Hz and channel map mono
I: [pulseaudio] source.c:     device.description = "Droid source droid"
I: [pulseaudio] source.c:     device.class = "sound"
I: [pulseaudio] source.c:     device.api = "droid-hal"
I: [pulseaudio] source.c:     droid.input.external = "true"
I: [pulseaudio] source.c:     droid.input.builtin = "true"
I: [pulseaudio] source.c:     droid.hw_module = "primary"
I: [pulseaudio] source.c:     device.icon_name = "audio-card"
I: [pulseaudio] droid-util.c: Module has HAL mic mute control.
I: [pulseaudio] droid-source.c: Using buffer size 1792.
D: [pulseaudio] droid-source.c: Set fixed latency 20317 usec
D: [pulseaudio] droid-source.c: Source set port 0x80000004
D: [pulseaudio] droid-util.c: input stream 0x10593e0 set_parameters(routing=-2147483644;input_source=1) 0x80000004 ; 0x00000001
I: [pulseaudio] droid-util.c: Set active input to (nil)

No more input stream failures. Testing the recording again confirms this, the microphone now works!

[MagneFire]

ok, some more testing reveals that the reason it fails to open an input stream is due to a missing sample rate. Pulseaudio requests a sample rate of 44100, which doesn't exist in the factory images only 16000, 32000, 48000 are supported.
Adding the sample rates that sturgeon provides fixes this issue (add 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000).

[FlorentRevest]

Nice :)