How to encode a record Audio of AS3 in PHP
I am trying to build a way to encode data AS3 audio recording in WAV in PHP. I used a library of WAV in AS3 coders previously, but a record 2 minutes would take 4 to 6 minutes on mobile, depending on the device. So I need to encode to WAV (or any other format that would make usable) in PHP to take the load of the application.
I have transated this encoder of Thibault Imbert to PHP. See the translation:
function encode($samples, $channels = 2, $bits = 16, $rate = 44100){
$data = create($samples);
$length = strlen($data);
$bytes = createHeaders($length, $channels, $bits, $rate);
$bytes .= $data;
return $bytes;
}
function create($samples) {
$newBytes = '';
$bytes = unpack("f*", $samples);
foreach ($bytes as $value) {
$newBytes .= pack("V*",$value * 0x7FFF);
}
return $newBytes;
}
function createHeaders($length, $channels = 2, $bits = 16, $rate = 44100) {
$RIFF = "RIFF";
$WAVE = "WAVE";
$FMT = "fmt ";
$DATA = "data";
$header = '';
$header .= $RIFF;
$header .= pack("I*", $length + 44);
$header .= $WAVE;
$header .= $FMT;
$header .= pack("I*", 16);
$header .= pack("v*", 1);
$header .= pack("v*", $channels);
$header .= pack("I*", $rate);
$header .= pack("I*", ( $rate * $channels * ($bits >> 3)));
$header .= pack("v*", ($channels * ($bits >> 3)));
$header .= pack("v*", $bits);
$header .= $DATA;
$header .= pack("I*", $length);
return $header;
}
Which will create a file readable by the right length (if the headers are obviously correct), but there is only silence when it is played. If I change the package size in 'create()' to ' f * ' (instead of unsigned 32-bit little endian int, float), I get static and I can faintly hear the sound in the background. I can't solve this multiplier to clear up the static method, however. (EDIT: before it is mentioned, I know the asterisk is not necessary for most, if not all of the package formats.) It was something that I tried to see if she could fix things and I never removed it)
The file itself is created as if:
private function start():void {
if ( !mic ) {
this.mic = Microphone.getMicrophone();
this.mic.rate = 44;
this.mic.setSilenceLevel( 0, 10000 );
this.recording = new ByteArray();
}
this.recording.length = 0; //reset byte array in case this is not first recording
this.mic.addEventListener( SampleDataEvent.SAMPLE_DATA, this.saveSample );
}
private function saveSample( e:SampleDataEvent ):void {
while( e.data.bytesAvailable ) {
var byte:Number = e.data.readFloat();
this.recording.writeFloat( byte );
}
}
public function stopRecording():void {
var file:File = File.applicationStorageDirectory.resolvePath( "audio-recording.wav" );
this.fs.open( file, FileMode.WRITE );
this.fs.writeBytes( this.recording );
this.fs.close();
}
I'm trying to encode the file is saved in stopRecording(). At this point, I don't know what to do. I tried to translate an other encoder as well, but that seemed to run through the memory as if it was nothing.
Does anyone have any suggestions as to what is the problem? The two encoders work very well in AS3. Is this a problem with the write file? Problem with writing the audio data in the byte array? Any suggestions will be useful
So I was unable to find a way to do this via PHP, but I have figure out how do it in a way that is effective and freaking fast in AS3. I realized that the slow fuse of encoding has been a loop in the byte array, read each individual byte, manipulating and write it to another array of bytes. This is an inefficient process, but necessary if you want to ignore the encoder of the recorder. The key was not abstract and rather to encode on the fly, like recording that happens.
If you record like this:
private function saveSample( e:SampleDataEvent ):void {
e.data.position = 0;
while( e.data.bytesAvailable ) {
this.recording.writeShort( e.data.readFloat() * (0x7fff) );
}
}
It's the encoding that Thibault Imbert wrote as you do a necessary task (pulling the data from the stream and saving it to a byte array).
With this, the data is written as it is necessary and sufficient to add the headers to make a WAV file.
this.recording.position = 0;
this.recording = this.writeHeaders( this.recording, 1 );
private function writeHeaders( data:ByteArray, channels:int=2, bits:int=16, rate:int=44100 ):ByteArray {
data.position = 0;
var bytes:ByteArray = new ByteArray();
bytes.length = 0;
bytes.endian = Endian.LITTLE_ENDIAN;
bytes.writeUTFBytes( "RIFF" );
bytes.writeInt( uint( data.length + 44 ) );
bytes.writeUTFBytes( "WAVE" );
bytes.writeUTFBytes( "fmt " );
bytes.writeInt( uint( 16 ) );
bytes.writeShort( uint( 1 ) );
bytes.writeShort( channels );
bytes.writeInt( rate );
bytes.writeInt( uint( rate * channels * ( bits >> 3 ) ) );
bytes.writeShort( uint( channels * ( bits >> 3 ) ) );
bytes.writeShort( bits );
bytes.writeUTFBytes( "data" );
bytes.writeInt( data.length );
bytes.writeBytes( data );
bytes.position = 0;
return bytes;
}
And oila. It's a valid WAV file created without delay after the end of the recording (while I was previously known a delay of 3 times the length of the record on my Nexus 4). I know that's not a very popular topic (Google, Adobe, these forums and StackOverflow were pretty useless to try to solve this problem), but I hope that this solution will help someone along the line.
EDIT: afterwards, make sure that the ByteArray you save in has its endian Endian.LITTLE_ENDIAN property immediately after instantiation. WAV files require this format and are unreadable if is not set to one.
Tags: Adobe Animate
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------------------
Information System
------------------
Time of this report: 07 25, 2012, 19:06:02
Computer name: RAIDER
Operating system: Windows 7 Ultimate 64 - bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120503) - 2030
Language: English (regional setting: English)
Manufacturer: Gigabyte Technology Co., Ltd..
System model: P67A-UD3-B3
BIOS: Award BIOS v6.00PG Modular
Processor: Intel Core i5 - 2500K CPU @ 3.30 GHz (4 CPUs), ~3.6GHz
Memory: RAM 8192MB
Available OS memory: 8176MB RAM
Page file: 2861MB used, 13487 MB of available space
Windows Dir: C:\Windows
DirectX version: DirectX 11
DX setup parameters: not found
DPI setting: Using System DPI
System DPI setting: 96 DPI (100%)
DWM DPI Scaling: disabled
DxDiag Version: 6.01.7601.17514 64 bit Unicode------------
DxDiag Notes
------------
Display 1 tab: No problems found.
Sound tab 1: No problems found.
2 Audio tab: No problems found.
Input tab: no problems found.-------------
Sound Devices
-------------
Description: SPDIF Out (Sound Blaster X - Fi Surround 5.1 Pro)
Default audio playback: Yes
Default voice playback: no
Hardware ID: USB\VID_041E & PID_30DF & REV_0100 & MI_00
Manufacturer ID: 65535
Product ID: 65535
Type: WDM
Driver name: ksaud.sys
Driver version: 6.00.0001.0460 (English)
Driver attributes: Final retail
WHQL Logo would be: n/a
Date and size: 2010-07-30 11:35:08, 1588608 bytes
Other files:
Driver provider: Creative Technology Ltd.
HW Accel level: basic
Cap flags: 0x0
Min/Max sample rate: 0, 0
Static/Strm HW Mix beef: 0, 0
Static/Strm HW 3D steers: 0, 0
HW memory: 0
Management of the voice: No.
Listen/Src/EAX (TM) 2.0: No, no
Listen/Src/I3DL2 (TM): No, no
Sensaura (TM) ZoomFX (tm): No.Description: Pregnant (Sound Blaster X - Fi Surround 5.1 Pro)
Default audio playback: No.
Default voice playback: Yes
Hardware ID: USB\VID_041E & PID_30DF & REV_0100 & MI_00
Manufacturer ID: 65535
Product ID: 65535
Type: WDM
Driver name: ksaud.sys
Driver version: 6.00.0001.0460 (English)
Driver attributes: Final retail
WHQL Logo would be: n/a
Date and size: 2010-07-30 11:35:08, 1588608 bytes
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Driver provider: Creative Technology Ltd.
HW Accel level: basic
Cap flags: 0x0
Min/Max sample rate: 0, 0
Static/Strm HW Mix beef: 0, 0
Static/Strm HW 3D steers: 0, 0
HW memory: 0
Management of the voice: No.
Listen/Src/EAX (TM) 2.0: No, no
Listen/Src/I3DL2 (TM): No, no
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Sound Capture devices
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Default voice Capture: No.
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Default voice Capture: Yes
Driver name: ksaud.sys
Driver version: 6.00.0001.0460 (English)
Driver attributes: Final retail
Date and size: 2010-07-30 11:35:08, 1588608 bytes
Cap flags: 0x0
Format flags: 0x0Hello
In Services, verify that the Windows Audio service is running and set to automatic.
a. Click Start and type Services and press ENTER.
(b) ensure that these services are defined accordingly.
c. right-click the service, and then click Properties.
According to the DXDiag, there is no default sound capture selected.
Description: Pregnant (Sound Blaster X - Fi Surround 5.1 Pro)
Default audio playback: No.
Default voice playback: YesDescription: What you Hear (Sound Blaster X - Fi Surround 5.1 Pro)
Capture audio by default: Yes
Default voice Capture: No.Description: Microphone (Webcam Pro 9000)
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Capture audio by default: No.
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