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authorLoïc Collignon <loic.collignon@iot.bzh>2018-09-10 10:36:46 +0200
committerLoïc Collignon <loic.collignon@iot.bzh>2018-10-01 15:46:43 +0200
commit75e26b091f6aae38c9edb069c173bcb04ae3ffd1 (patch)
treeac31716b5bdd2ad0236559d141cdcca8f9696332 /docs
parentfe834167fd205e9a38c986bfb9dfde4265e9cc45 (diff)
Updated documentation
Updated documentation up to date and using the gitbook format. Change-Id: Ie5d6a3bb489b9a9a95e21f5edd05bdd77bff5816 Signed-off-by: Loïc Collignon <loic.collignon@iot.bzh>
Diffstat (limited to 'docs')
-rw-r--r--docs/4a-framework/README.md42
-rw-r--r--docs/4a-framework/SUMMARY.md5
-rw-r--r--docs/4a-framework/book.json11
-rw-r--r--docs/4a-framework/components.md49
-rw-r--r--docs/4a-framework/concepts.md37
-rw-r--r--docs/4a-framework/images/4a-architecture.svg155
-rw-r--r--docs/4a-framework/images/apps-architecture.svg119
-rw-r--r--docs/high-level-api/README.md80
-rw-r--r--docs/high-level-api/SUMMARY.md10
-rw-r--r--docs/high-level-api/TipsAndTricks/4aTools.md198
-rw-r--r--docs/high-level-api/TipsAndTricks/AdjustVolumes.md9
-rw-r--r--docs/high-level-api/TipsAndTricks/Devices.md32
-rw-r--r--docs/high-level-api/TipsAndTricks/HALs.md46
-rw-r--r--docs/high-level-api/TipsAndTricks/SUMMARY.md9
-rw-r--r--docs/high-level-api/TipsAndTricks/images/MixerBaseMenu.pngbin0 -> 170421 bytes
-rw-r--r--docs/high-level-api/TipsAndTricks/images/changeSound.pngbin0 -> 123509 bytes
-rw-r--r--docs/high-level-api/book.json11
-rw-r--r--docs/high-level-api/kickstart.md22
-rw-r--r--docs/high-level-api/reference.md95
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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/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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--- /dev/null
+++ b/docs/4a-framework/SUMMARY.md
@@ -0,0 +1,5 @@
+# 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
new file mode 100644
index 0000000..43eb2f0
--- /dev/null
+++ 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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+++ b/docs/4a-framework/components.md
@@ -0,0 +1,49 @@
+# 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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+++ 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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diff --git a/docs/high-level-api/README.md b/docs/high-level-api/README.md
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+# High Level API
+
+The High Level API provides an abstraction of audio roles.
+
+## Configuration
+
+Here is a sample configuration.
+
+```json
+{
+ "$schema": "http://iot.bzh/download/public/schema/json/ctl-schema.json",
+ "metadata": {
+ "uid": "4a-policy",
+ "version": "0.1",
+ "api": "4a-policy",
+ "require": [],
+ "info": "Basic Audio Policy Control for Audio-4a - Sample 1",
+ "author": "Loïc Collignon <loic.collignon@iot.bzh>",
+ "date": "2018-05-25"
+ },
+ "onload": [],
+ "controls": [],
+ "events": [],
+ "roles":[
+ {
+ "uid": "radio",
+ "description": "Radio (tuner)",
+ "priority": 0,
+ "stream": "radio_stream"
+ },
+ {
+ "uid": "multimedia",
+ "description": "Multimedia content (e.g. media player, etc.)",
+ "priority": 0,
+ "stream": "multimedia"
+ },
+ {
+ "uid": "emergency",
+ "description": "Safety-relevant or critical alerts/alarms",
+ "priority": 100,
+ "stream": "emergency",
+ "interrupts":[
+ {
+ "type": "ramp",
+ "args": { "uid": "ramp-slow", "volume": 30}
+ }
+ ]
+ },
+ {
+ "uid": "navigation",
+ "name": "navigation",
+ "description": "Navigation instructions (GPS, directions, etc.)",
+ "priority": 25,
+ "stream": "navigation",
+ "interrupts":[
+ {
+ "type": "ramp",
+ "args": { "uid": "ramp-slow", "volume": 30}
+ }
+ ]
+ }
+ ]
+}
+```
+
+Each defined roles should have a stream associated. This stream will be
+provided by HALs. If no HAL provides the stream, then the audio role will have
+no device URI. If multiple HALs provide the same stream, a race condition
+occurs, the first HAL found will be used, the next will be ignored.
+
+A higher value means a higher priority. In this sample, the **emergency** role
+has a higher priority than the **navigation**.
+
+>**NOTE:** In this sample there is only one stream per role and it's named
+>after the corresponding role, but none of this is mandatory.
+
+## Policy engine
+
+Policy engine is provided as a controller plugin for the high level API.
+Currently, the sample policy engine only support the **ramp** interruption.
diff --git a/docs/high-level-api/SUMMARY.md b/docs/high-level-api/SUMMARY.md
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--- /dev/null
+++ b/docs/high-level-api/SUMMARY.md
@@ -0,0 +1,10 @@
+# Summary
+
+* [Abstract](README.md)
+* [Kickstart](kickstart.md)
+* [Reference](reference.md)
+* [Tips & Tricks](TipsAndTricks/SUMMARY.md)
+ * [Adjust Volumes](TipsAndTricks/AdjustVolumes.md)
+ * [4a-tools](TipsAndTricks/4aTools.md)
+ * [Devices](TipsAndTricks/Devices.md)
+ * [HALs](TipsAndTricks/HALs.md)
diff --git a/docs/high-level-api/TipsAndTricks/4aTools.md b/docs/high-level-api/TipsAndTricks/4aTools.md
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@@ -0,0 +1,198 @@
+# 4a-tools
+
+4a-tools is a set of simple scripts that can be used to test and troubleshoot
+4a framework.
+
+## 4a-status
+
+4a-status gives a diagnostic whether 4a-framework is supposed to be working or
+not.
+
+```bash
+user@machine$ 4a-status
+---- Audio cards detected ----
+card 0: Loopback
+card 1: Intel
+
+---- snd-aloop driver availability ----
+SUCCESS: Built into the kernel
+
+---- 4a service status ----
+SUCCESS: Service is currently running!
+```
+
+If any error is shown then there is no way that 4a-framework can work.
+Not running services do trigger only a warning because you may have started the
+service's binding manually and the script cannot detect this.
+If you don't, this must be considered as an error, because 4a-framework
+obviously cannot work when bindings are not running.
+
+```bash
+---- Audio cards detected ----
+card 0: Loopback
+card 1: Intel
+
+---- snd-aloop driver availability ----
+SUCCESS: Built into the kernel
+
+---- 4a service status ----
+WARNING: Service is not currently running!
+It can be started using the following command:
+systemctl restart *agl-service-audio-4a*.service
+```
+
+## 4a-api
+
+This script lets you call 4a's APIs to test bindings and get some infos.
+
+### Ping API
+
+Pinging an API let you know that the binding providing this API is running and
+ready.
+
+```bash
+user@machine$ 4a-api api smixer ping
+Detected systemd unit file!
+Port detected: 1025
+ON-REPLY 1:smixer/ping: OK
+{
+ "response":3,
+ "jtype":"afb-reply",
+ "request":{
+ "status":"success"
+ }
+}
+```
+
+### List HALs
+
+You can list availables HALs using the following command:
+
+```bash
+user@machine$ 4a-api hals
+Detected systemd unit file!
+Port detected: 1025
+ON-REPLY 1:4a-hal-manager/loaded: OK
+{
+ "response":[
+ "4a-hal-intel-qemu"
+ ],
+ "jtype":"afb-reply",
+ "request":{
+ "status":"success",
+ "info":"Requested data"
+ }
+}
+```
+
+If the returned list is empty, this means that no HAL is loaded and ready. In
+such a case you won't be able to use 4a-framework because this means that there
+is no device to play audio on.
+
+To get more information about a HAL, you can call its **info** verb:
+
+```bash
+user@machine$ 4a-api api 4a-hal-intel-qemu info
+Detected systemd unit file!
+Port detected: 1025
+ON-REPLY 1:4a-hal-intel-qemu/info: OK
+{
+ "response":{
+ "streams":[
+ {
+ "name":"multimedia",
+ "cardId":"hw:0,0,2"
+ },
+ {
+ "name":"navigation",
+ "cardId":"hw:0,0,3"
+ },
+ {
+ "name":"emergency",
+ "cardId":"hw:0,0,4"
+ }
+ ],
+ "playbacks":[
+ {
+ "name":"playback",
+ "mixer-name":"INTEL-QEMU:playback"
+ }
+ ],
+ "captures":[
+ {
+ "name":"capture",
+ "mixer-name":"INTEL-QEMU:capture"
+ }
+ ]
+ },
+ "jtype":"afb-reply",
+ "request":{
+ "status":"success",
+ "info":"Requested data"
+ }
+}
+```
+
+This allows you to get which device is bound to which stream.
+Please note these are stream names, not roles names.
+In addition, multiples HALs can provide the same stream.
+In the current implementation, it results in a race condition: 4a-framework
+will be using the first HAL providing the stream.
+
+### List roles
+
+This lets you get the list of available audio roles.
+Only roles with a bound device are listed here, because roles without a device
+are pretty much unusable.
+
+```bash
+user@machine$ 4a-api roles
+Detected systemd unit file!
+Port detected: 1025
+ON-REPLY 1:ahl-4a/get_roles: OK
+{
+ "response":[
+ "radio",
+ "multimedia",
+ "emergency",
+ "navigation"
+ ],
+ "jtype":"afb-reply",
+ "request": {
+ "status":"success"
+ }
+}
+```
+
+## 4a-play
+
+4a-play lets you play some audio file on a specified device, with an optional
+audio role.
+
+```bash
+4a-play <file> [<device> [<role>]]
+```
+
+Where *file* is the path to the file to play, *device* is the device to play on
+and and *role* is the 4a audio role to open (multimedia for example).
+
+The specified role should be the one that is bound to the specified device,
+however the script is not able to detect it so there is no control about this.
+The role is opened before playing the audio file, and closed after playing is
+over.
+
+So for example:
+
+```bash
+4a-play Happy_MBB_75.ogg hw:2,0,0 multimedia
+```
+
+>**NOTE**: For now you have to specify the device and the role. Future versions
+>of this script may detect devices and roles relations so that you will be able
+>to omit either role or device.
+>
+>The device that usually matches "multimedia" is "hw:0,0,2" (for more details
+>please read the [HALs](HALs.md) section).
+
+>**NOTE**: Some media files (WAV, MP3 and OGG) are provided with 4a-tools for
+>testing purpose and can be used as reference assets.
diff --git a/docs/high-level-api/TipsAndTricks/AdjustVolumes.md b/docs/high-level-api/TipsAndTricks/AdjustVolumes.md
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+# Adjust volumes
+
+On the main menu, hit the "Mixer" icon.
+
+![Main Menu Interface](images/MixerBaseMenu.png)
+
+Then drag the cursor to change the sound volume of the corresponding role.
+
+![Mixer Interface](images/changeSound.png)
diff --git a/docs/high-level-api/TipsAndTricks/Devices.md b/docs/high-level-api/TipsAndTricks/Devices.md
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+# List available devices
+
+To list the available devices, as well as their subdevices, you can use the
+**aplay** command.
+
+```bash
+user@machine$ aplay -l
+**** List of PLAYBACK Hardware Devices ****
+card 0: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
+ Subdevices: 8/8
+ Subdevice #0: subdevice #0
+ Subdevice #1: subdevice #1
+ Subdevice #2: subdevice #2
+ Subdevice #3: subdevice #3
+ Subdevice #4: subdevice #4
+ Subdevice #5: subdevice #5
+ Subdevice #6: subdevice #6
+ Subdevice #7: subdevice #7
+card 0: Loopback [Loopback], device 1: Loopback PCM [Loopback PCM]
+ Subdevices: 8/8
+ Subdevice #0: subdevice #0
+ Subdevice #1: subdevice #1
+ Subdevice #2: subdevice #2
+ Subdevice #3: subdevice #3
+ Subdevice #4: subdevice #4
+ Subdevice #5: subdevice #5
+ Subdevice #6: subdevice #6
+ Subdevice #7: subdevice #7
+card 1: Intel [HDA Intel], device 0: Generic Analog [Generic Analog]
+ Subdevices: 0/1
+ Subdevice #0: subdevice #0
+```
diff --git a/docs/high-level-api/TipsAndTricks/HALs.md b/docs/high-level-api/TipsAndTricks/HALs.md
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+# HALs
+
+HALs are known as json files in 4a, they are stored in
+**/usr/libexec/agl/4a-hal**.
+
+Enabled HALs can be found in the **etc** subfolder, and disabled HALs in
+**etc.available**.
+
+You can enable and disable HALs just by moving the corresponding json file from
+one folder to the other.
+
+Example:
+
+```bash
+user@machine$ ls etc etc.available/
+etc:
+hal-4a-csl-cm106-8ch-usb.json
+
+etc.available/:
+hal-4a-2ch-generic-usb.json hal-4a-intel.json
+hal-4a-ensoniq.json hal-4a-jabra.json
+hal-4a-intel-minnow.json hal-4a-rcar-m3.json
+hal-4a-intel-qemu.json hal-4a-rcar-m3kf.json
+
+user@machine$ mv etc/hal-4a-csl-cm106-8ch-usb.json etc.available
+user@machine$ mv etc.available/hal-4a-2ch-generic-usb.json etc
+
+user@machine$ ls etc etc.available/
+etc:
+hal-4a-2ch-generic-usb.json
+
+etc.available/:
+hal-4a-csl-cm106-8ch-usb.json hal-4a-intel.json
+hal-4a-ensoniq.json hal-4a-jabra.json
+hal-4a-intel-minnow.json hal-4a-rcar-m3.json
+hal-4a-intel-qemu.json hal-4a-rcar-m3kf.json
+
+user@machine$ sync
+user@machine$ reboot
+```
+
+>NOTE: Even if multiple HAL are allowed, you have to make sure that they don't
+>provide the same streams, because it will cause a race condition in the high
+>level API. The first HAL providing the stream is used, any other are ignored.
+>
+>Also, the hardware used by enabled HALs should be available.
diff --git a/docs/high-level-api/TipsAndTricks/SUMMARY.md b/docs/high-level-api/TipsAndTricks/SUMMARY.md
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+# Tips & Tricks
+
+In this section you'll find useful tips and tricks to help you in case of
+trouble.
+
+* [Adjust Volumes](AdjustVolumes.md)
+* [4a-tools](4aTools.md)
+* [Devices](Devices.md)
+* [HALs](HALs.md) \ No newline at end of file
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diff --git a/docs/high-level-api/book.json b/docs/high-level-api/book.json
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+{
+ "title": "AGL Advanced Audio Architecture (4A)",
+ "subtitle": "High Level API",
+ "description": "This is the 4A High Level API 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_HighLevelAPI"
+} \ No newline at end of file
diff --git a/docs/high-level-api/kickstart.md b/docs/high-level-api/kickstart.md
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+# Kickstart
+
+As an application developer, when you play audio, you have to use a device URI.
+Instead of using the default one, guessing one by listing them or even
+hardcoding it, you should call **ahl-4a/[role]** with **open** as action.
+
+The role to open should be defined in a configuration file or hardcoded. If you
+hardcode it, please consider to at least define it at one known place so that it
+can be easily changed.
+
+As opening a role may fail, you should test if it returns a success and a device
+URI. Both of them should be tested because it's perfectly fine to have a role
+without a device URI from 4a point of view (no device is bound to the role thus
+no audio can be played in this case).
+
+Once you have finished to play audio, you should call **ahl-4a/[role]** with
+**close** as action. This is important to allow other applications to use the
+role when you are not using it.
+
+You may also want to handle events of the window manager to know if you
+application is displayed or not, and open/close accordingly the role you are
+using.
diff --git a/docs/high-level-api/reference.md b/docs/high-level-api/reference.md
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+# Reference
+
+## Verbs
+
+### ahl-4a/get_roles
+
+Get the list of available audio roles. By default it returns the list of roles
+that are bound to a stream. To get a list of all defined roles, regardless if
+they are bound to a stream or not, you can pass the following parameter.
+
+```json
+{
+ "verbose": true
+}
+```
+
+### ahl-4a/[role]
+
+Replace [role] by the role's name. For example **ahl-4a/multimedia**.
+
+This verb allows the control of the audio role. The action executed depends on
+the parameter.
+
+#### Open
+
+```json
+{ "action": "open" }
+```
+
+Request to open the role.
+
+On success it returns the device URI to open. This action fails if the role is
+already opened.
+
+When a role is opened, it triggers the first interruption, if any, of the policy
+engine.
+
+The policy engine executes the interruption for each opened audio role with a
+lower priority.
+
+#### Close
+
+```json
+{ "action": "close" }
+```
+
+Request to close the role.
+
+On success it closes the role. You can only close roles that you opened before.
+An error will occur if you try to close a role that an other application has
+opened.
+
+#### Volume
+
+```json
+{
+ "action": "volume",
+ "value": 80
+}
+```
+
+Request to get or set the volume.
+
+Value can be absolute or relative. Use a string as value to use relative, like
+**"+10"** or **"-20"**. To get the volume you can use **"+0"** as value.
+
+#### Mute
+
+```json
+{
+ "action": "mute"
+}
+```
+
+Mute the volume of this.
+
+#### Unmute
+
+```json
+{
+ "action": "unmute"
+}
+```
+
+Unmute the volume of this role.
+
+#### Interrupt
+
+```json
+{
+ "action": "interrupt"
+}
+```
+
+Ask the policy engine to execute an interruption. \ No newline at end of file