planning audio on pi

pi/asound.conf

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+# Use the Google Voice HAT soundcard as index 0 (primary card)
+options snd_rpi_googlevoicehat_soundcard index=0
+
+# Define a soft volume control for the speaker (Playback)
+pcm.softvol {
+    type softvol
+    slave.pcm "dmix"           # route through dmix for mixing
+    control {
+        name "Master"         # name of volume control
+        card 0
+    }
+}
+
+# Define a software volume (gain) for the microphone (Capture)
+pcm.micboost {
+    type softvol
+    slave.pcm "dsnoop"        # route through dsnoop for sharing
+    control {
+        name "Micro"          # name of mic gain control
+        card 0
+    }
+    min_dB -10.0
+    max_dB 50.0
+    resolution 256
+}
+
+# Set default devices to use the above for asymmetrical playback/capture
+pcm.!default {
+    type asym
+    playback.pcm "plug:softvol"
+    capture.pcm "plug:micboost"
+}
+
+ctl.!default {
+    type hw
+    card 0
+}

plans/audio_on_roomba_outline.md

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+# general idea
+- the pi on each roomba will have a speaker and microphone
+- alsa devices
+  - they are both the default audio device
+- you will have to modify roverd, the pi install script, and the server to get this all to work
+
+# adding stuff to installation script
+- I am using the google voice AIY v1 kits for audio
+- boot config stuff
+  - enable `dtoverlay=googlevoicehat-soundcard`
+  - disable `dtparam=audio=on`
+- copy asound.conf in pi folder to /etc/asound.conf
+
+# microphone
+- add microphone to the SRT publish stream
+
+# speaker
+- user's chat messages will be TTS'ed through the speaker on the pi
+  - either flite with a way to choose the voice
+  - or espeak where you can choose the pitch
+- on the web UI and in the chat API
+  - add new stuff to chat
+    - only shows up if you are on a rover
+    - only shows up if TTS is enabled on that rover
+  - people can choose between flite or espeak
+    - if they choose flite, they can choose the voice from the default flite voices (exclude awb and awb_time)
+    - if they choose espeak, they can choose the pitch. Have a dropdown with increments of 10 from 0 to 99