'libraries/androidaudiorecorder/androidaudiorecorder.lcb',

/**

This library provides Android audio recording functionality, via the

android.media.MediaRecorder class.

Description:

Use this library to record audio on Android.

>*Note:* This library requires RECORD_AUDIO, WRITE_EXTERNAL_STORAGE and

> CAPTURE_AUDIO_OUTPUT permissions. These will be automatically added to

> the application manifest when an application including this library is

> built.

*/

library com.livecode.library.androidaudiorecorder

metadata version is "1.0.0"

metadata author is "LiveCode"

metadata title is "Android Audio Recorder"

-- We need permissions to record audio and write to the external

-- storage directory.

metadata android.permissions is "RECORD_AUDIO,CAPTURE_AUDIO_OUTPUT"

use com.livecode.foreign

use com.livecode.java

__safe foreign handler _JNI_MediaRecorderConstructor() returns JObject \

binds to "java:android.media.MediaRecorder>new()"

__safe foreign handler _JNI_MediaRecorderSetRecordInput(in pRecorder as JObject, in pSource as JInt) returns nothing \

binds to "java:android.media.MediaRecorder>setAudioSource(I)V"

__safe foreign handler _JNI_MediaRecorderSetRecordFormat(in pRecorder as JObject, in pFormat as JInt) returns nothing \

binds to "java:android.media.MediaRecorder>setOutputFormat(I)V"

__safe foreign handler _JNI_MediaRecorderSetRecordEncoder(in pRecorder as JObject, in pEncoder as JInt) returns nothing \

binds to "java:android.media.MediaRecorder>setAudioEncoder(I)V"

__safe foreign handler _JNI_MediaRecorderSetRecordOutputFile(in pRecorder as JObject, in pFile as JString) returns nothing \

binds to "java:android.media.MediaRecorder>setOutputFile(Ljava/lang/String;)V"

__safe foreign handler _JNI_MediaRecorderPrepare(in pRecorder as JObject) returns nothing \

binds to "java:android.media.MediaRecorder>prepare()V"

__safe foreign handler _JNI_MediaRecorderStart(in pRecorder as JObject) returns nothing \

binds to "java:android.media.MediaRecorder>start()V"

__safe foreign handler _JNI_MediaRecorderStop(in pRecorder as JObject) returns nothing \

binds to "java:android.media.MediaRecorder>stop()V"

__safe foreign handler _JNI_MediaRecorderReset(in pRecorder as JObject) returns nothing \

binds to "java:android.media.MediaRecorder>reset()V"

__safe foreign handler _JNI_MediaRecorderGetMaxAmplitude(in pRecorder as JObject) returns JInt \

binds to "java:android.media.MediaRecorder>getMaxAmplitude()I"

-- This will store an instance of a MediaRecorder

private variable mRecorder as optional JObject

constant kRecordInputs is { \

"Default" : 0, \

"Mic" : 1, \

"VoiceUplink" : 2, \

"VoiceDownlink" : 3, \

"VoiceCall" : 4, \

"Camcorder" : 5, \

"VoiceRecognition" : 6, \

"VoiceCommunication" : 7, \

"RemoteSubmix" : 8, \

"Unprocessed" : 9 \

}

constant kRecordCompressionTypes is { \

"Default" : 0, \

"AMR NB" : 1, \

"AMR WB" : 2, \

"AAC" : 3, \

"HE AAC" : 4, \

"AAC ELD" : 5, \

"Vorbis" : 6 \

}

constant kRecordFormats is { \

"ThreeGPP" : 1, \

"MPEG-4" : 2, \

"AMR WB" : 4, \

"AAC ADTS" : 6, \

"WebM" : 9 \

}

private variable mRecordInput as optional String

private variable mRecordFormat as optional String

private variable mRecordCompressionType as optional String

private handler IsAndroid() returns Boolean

return the operating system is "android"

end handler

handler GetOptionalProperty(in pVar as optional String, in pDefault as String) returns String

if pVar is not nothing then

return pVar

end if

return pDefault

end handler

handler SetRecorderProperties() returns nothing

if not IsAndroid() then

throw "Not supported on this platform"

end if

if mRecorder is nothing then

return

end if

variable tRecordInput as String

put GetOptionalProperty(mRecordInput, "Mic") into tRecordInput

variable tRecordFormat as String

put GetOptionalProperty(mRecordFormat, "ThreeGPP") into tRecordFormat

variable tRecordCompressionType as String

put GetOptionalProperty(mRecordCompressionType, "AMR NB") into tRecordCompressionType

_JNI_MediaRecorderSetRecordInput(mRecorder, kRecordInputs[tRecordInput])

_JNI_MediaRecorderSetRecordFormat(mRecorder, kRecordFormats[tRecordFormat])

_JNI_MediaRecorderSetRecordEncoder(mRecorder, kRecordCompressionTypes[tRecordCompressionType])

end handler

handler CreateRecorder() returns nothing

if mRecorder is nothing then

put _JNI_MediaRecorderConstructor() into mRecorder

end if

SetRecorderProperties()

end handler

/**

Summary: Start recording an audio file, using the given filename

Example:

local tFilePath

put specialFolderPath("external documents") & slash & "recording.mp4" \

into tFilePath

androidRecorderStartRecording tFilePath

Parameters:

pFileName: The absolute filename of the output file

Description:

Use the <androidRecorderStartRecording> handler to start recording audio

on Android using the input source, compression type and output format

selected using the <androidRecorderSetRecordInput>,

<androidRecorderSetRecordCompressionType>, and <androidRecorderSetRecordFormat>

handlers. The default input source, compression and output format are

built-in microphone, AMR-NB and 3gpp respectively.

References:

androidRecorderSetRecordInput (handler),

androidRecorderSetRecordCompressionType (handler),

androidRecorderSetRecordFormat (handler)

*/

public handler androidRecorderStartRecording(in pFileName as String) returns nothing

if not IsAndroid() then

throw "Not supported on this platform"

end if

CreateRecorder()

if mRecorder is nothing then

throw "unable to create recorder"

end if

_JNI_MediaRecorderSetRecordOutputFile(mRecorder, StringToJString(pFileName))

_JNI_MediaRecorderPrepare(mRecorder)

_JNI_MediaRecorderStart(mRecorder)

end handler

/**

Summary: Stop recording

Example:

on mouseUp

try

androidRecorderStopRecording

catch tError

answer tError

end try

end mouseUp

Description:

Use the <androidRecorderStopRecording> handler to stop the current

recording. If no recording is currently happening, this handler will

throw an error.

*/

public handler androidRecorderStopRecording()

-- Don't do anything if there is no recorder object

if mRecorder is nothing then

throw "recording has not been started!"

return

end if

_JNI_MediaRecorderStop(mRecorder)

_JNI_MediaRecorderReset(mRecorder)

end handler

/**

Summary: Returns the max amplitude of the recording since last sampled

Example:

-- Poll amplitude every 30 millisecs, and output values

command LogAmplitude

put androidRecorderGetMaxAmplitude()

send "LogAmplitude" to me in 30 millisecs

end UpdateAmplitudeAndTimer

Description:

Use the <androidRecorderGetMaxAmplitude> handler to retrieve the maximum

amplitude value reached during recording from the selected input source

since the amplitude was last retrieved.

<androidRecorderGetMaxAmplitude> returns 0 if no recording is currently

happening.

*/

--

public handler androidRecorderGetMaxAmplitude() returns Integer

if mRecorder is nothing then

return 0

end if

return _JNI_MediaRecorderGetMaxAmplitude(mRecorder)

end handler

/**

Summary: Set the record input source

Example:

androidRecorderSetRecordInput "mic"

Parameters:

pInputSource (enum): The record input source

- "Default": The device's default record input source

- "Mic": Microphone audio source

- "VoiceUplink": Voice call uplink (Tx) audio source

- "VoiceDownlink": Voice call uplink (Tx) audio source.

- "VoiceCall": Voice call uplink + downlink audio source

- "Camcorder": Microphone audio source tuned for video recording, with the same orientation as the camera if available

- "VoiceRecognition": Microphone audio source tuned for voice recognition

- "VoiceCommunication": Microphone audio source tuned for voice recognition

- "RemoteSubmix": Audio source for a submix of audio streams to be presented remotely

- "Unprocessed": Microphone audio source tuned for unprocessed (raw) sound if available, behaves like Default otherwise

Description:

Use the <androidRecorderSetRecordInput> handler to control the source

and tuning of the record input.

*/

public handler androidRecorderSetRecordInput(in pInputSource as String)

if pInputSource is not among the keys of kRecordInputs then

throw "unrecognised source"

return

end if

put pInputSource into mRecordInput

SetRecorderProperties()

end handler

/**

Summary: Set the record compression type

Example:

androidRecorderSetRecordCompressionType "AMR NB"

Parameters:

pCompressionType (enum): The record compression type

- "Default": The default compression type

- "AMR NB": AMR Narrowband

- "AMR WB": AMR Wideband

- "AAC": AAC Low Complexity (AAC-LC)

- "HE AAC": High Efficiency AAC (HE-AAC)

- "AAC ELD": Enhanced Low Delay AAC (AAC-ELD)

- "Vorbis" : Ogg Vorbis

Description:

Use the <androidRecorderSetRecordCompressionType> handler to control the

audio encoding used by the audio recorder.

*/

public handler androidRecorderSetRecordCompressionType(in pCompressionType as String)

if pCompressionType is not among the keys of kRecordCompressionTypes then

throw "unrecognised compression type"

return

end if

put pCompressionType into mRecordCompressionType

SetRecorderProperties()

end handler

/**

Summary: Set the record output format

Example:

androidRecorderSetRecordFormat "ThreeGPP"

Parameters:

pRecordFormat (enum): The record output format

"ThreeGPP":

"MPEG-4":

"AMR WB":

"AAC ADTS":

"WebM":

Description:

Use the <androidRecorderSetRecordFormat> handler to set the format of

the output file.

*/

public handler androidRecorderSetRecordFormat(in pRecordFormat as String)

if pRecordFormat is not among the keys of kRecordFormats then

throw "unrecognised source"

return

end if

put pRecordFormat into mRecordFormat

SetRecorderProperties()

end handler

end library

An android audio recorder has been added. As well as starting and

stopping recording, it allows the selection of various input

sources, encoding types and output formats. The library places

the following handlers in the message path:

- `androidRecorderStartRecording pFileName`: Start recording an audio file, using the given filename

- `androidRecorderStopRecording`: Stop recording

- `androidRecorderGetMaxAmplitude`: Returns the max amplitude of the recording since last sampled

- `androidRecorderSetRecordCompressionType pType`: Set the record compression type

- `androidRecorderSetRecordFormat pFormat`: Set the record output format

- `androidRecorderSetRecordInput pSource`: Set the record input source