Backport of audio documentation from masterflounder_6.0.3flounder/6.0.36.0.3

Documentation was available only on master. New documentation website is
now by branch, so documentation should be available on both branches.

Bug: SPEC-1993

Change-Id: I55484d5c1f28ae1e7fa927533b3dd862a03ed207
Signed-off-by: Loïc Collignon <loic.collignon@iot.bzh>

9 files changed, 949 insertions, 0 deletions

diff --git a/docs/4a-framework/README.md b/docs/4a-framework/README.md
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+# AGL Advanced Audio Architecture (4a)
+
+## Abstract
+
+4a is an audio framework made to handle automotive use cases like stream
+priority and interruptions. It does **not** deal with the audio by itself but
+rather with the policies and signaling around it. This means that 4a must be
+used in conjunction with an other API that is in charge of the audio stuff,
+like **alsa** or **pulseaudio**.
+
+## Architecture
+
+### Global architecture
+
+![applications architecture diagram](images/agl-audio-arch.png)
+
+This detailed diagram shows the interactions between all components.
+
+![applications architecture diagram](images/apps-architecture.svg)
+
+This diagram shows the global architecture that any application playing audio
+should follow. As a developer, when you want to play audio, you rely on APIs
+such as alsa, pulseaudio or higher level API(s). To play audio you usually have
+some kind of device URI that you have to open in order to write audio data to
+it.
+
+4a does **not** change anything about that. You still have to do all of this. 4a
+provides permissions, signals and policies. This means that all compliant
+applications have to ask 4a for a 'role' when they want to play audio. If 4a
+grants them the permission, it returns a device URI that applications have to
+open.
+
+Nothing prevent an application to directly open a device, but in this case no
+policies can be applied and access permissions are handled by system policies.
+
+### 4a Architecture
+
+![4a's architecture diagram](images/4a-architecture.svg)
+
+Even if applications only deal with the high level API, 4a is made of multiple
+components that rely on each other.
+
+The high level API uses the hal-manager to list enabled HALs then it uses
+directly those HALs.
+
+HALs rely directly on drivers and/or softmixer.
diff --git a/docs/4a-framework/SUMMARY.md b/docs/4a-framework/SUMMARY.md
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+++ b/docs/4a-framework/SUMMARY.md
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+# Summary
+
+* [Architecture](README.md)
+* [Concepts](concepts.md)
+* [Components](components.md)
\ No newline at end of file
diff --git a/docs/4a-framework/book.json b/docs/4a-framework/book.json
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+++ b/docs/4a-framework/book.json
@@ -0,0 +1,11 @@
+{
+    "title": "AGL Advanced Audio Architecture (4A)",
+    "subtitle": "4A Framework",
+    "description": "This is the 4A framework documentation",
+    "keywords": "Audio, 4a, AGL, Development, Iotbzh",
+    "author": "IoT.Bzh Team",
+    "website": "http://iot.bzh",
+    "published": "September 2018",
+    "version": "1.0",
+    "pdf_filename": "AGL_4A_Framework"
+}
\ No newline at end of file
diff --git a/docs/4a-framework/components.md b/docs/4a-framework/components.md
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+# Components
+
+4a framework is made of several components which provide features to each other.
+The High Level API component is the only one that exports a public API. This
+means that, as an application developer you only need to care about the High
+Level API.
+
+## High level API
+
+This is the publicly exported API. It exposes one verb for each audio roles,
+plus **get_roles** to get the list of audio roles.
+
+This component manages audio roles and applies permissions, signaling and
+policies. Because each role is a unique verb, it means that each role can have
+its own smack label.
+
+It makes use of the **4a-hal-manager** to list all HALs and their
+configurations. Then it uses directly the enabled HALs.
+
+## 4a-hal-manager
+
+This component is responsible for HALs detection, initialization and state
+management.
+
+## 4a-hal-*
+
+This block represents all the different HALs. You can load multiple HALs
+provided that they don't interfere with each other.
+HALs can be provided by two means:
+
+* Built directly by the **4a-hal-manager** using it's controller and json files.
+* External HAL (like the unicens one), that have to register themselves to the
+  **4a-hal-manager**.
+
+HALs manage audio streams and zones. The streams are bound to audio roles.
+
+## 4a-softmixer
+
+This component abstracts the real devices to virtual ones and provides some
+basic mixing capabilities for devices that don't have this feature builtin.
+It exposes streams named like the audio roles.
+
+This component can be used by HALs, but this is not mandatory.
+
+HALs can either :
+
+* use 4a-softmixer (for example when hardware doesn't provide mixing feature),
+  or
+* take advantage from the hardware to provide the mixing capabilities.
diff --git a/docs/4a-framework/concepts.md b/docs/4a-framework/concepts.md
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+# Concepts
+
+A user application requests to open an audio role, which is bound to a stream,
+which is bound to a zone. This allows the application to only care about the
+audio role.
+
+For example, a navigation application can request the **navigation** role, which
+is bound to the **navigation** stream defined by the HAL. This stream is bound
+to the **driver** zone, which is the closest speaker to the driver.
+
+## Roles
+
+The high level API allows applications to open roles such as **emergency**,
+**navigation** or **multimedia**. A role is bound to a stream, which is
+basically a device URI. When a role is opened, then the policy engine is
+notified and executes an interrupt on every other opened role with a lower
+priority. An interrupt is a policy engine function that can change the volume,
+mute or unmute, change the stream's state.
+
+This behaviour allows the policy engine to take actions like lowering the radio
+volume when an application wants to play something on the emergency role.
+
+## Streams
+
+A stream is basically a device URI that you can open to write audio data. For
+example, it can be "hw:2,0,1", which means that you have to use this as an alsa
+device URI.
+
+## Zones
+
+Multiple speakers are spread around inside a vehicule, they are named depending
+on their position, like **front-center**, **front-left**, **front-right**,
+**rear-left**, **rear-right**, etc...
+
+Zones are an abstraction of positional audio. A zone is made of one or more
+speakers and describes logical audio areas like **driver**, **front**, **rear**,
+etc.
diff --git a/docs/4a-framework/images/4a-architecture.svg b/docs/4a-framework/images/4a-architecture.svg
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