Hi SAITAMA Taro,
I have been using speex-1.2beta1 dll in our voice application written with
C#. In order to use Speex correctly firstly I advice to you examination
speexenc and speexdec projects.
I have used unsafe code and fixed statements in C#. I have added following
method to library and I used that instead of speex_encoder_init simply.
void *speex_encoder_init_new(int modeID)
{
const SpeexMode *mode;
mode = speex_lib_get_mode(modeID);
return mode->enc_init(mode);
}
Maybe following codes that I have been using in a class can help you.
/* structs */
public struct SpeexBits
{
char *chars; /* "raw" data */
int nbBits; /* Total number of bits stored in the
stream*/
int charPtr; /* Position of the byte "cursor" */
int bitPtr; /* Position of the bit "cursor" within the
current char */
int owner; /* Does the struct "own" the "raw" buffer
(member "chars") */
int overflow; /* Set to one if we try to read past the
valid data */
int buf_size; /* Allocated size for buffer */
int reserved1; /* Reserved for future use */
void *reserved2; /* Reserved for future use */
}
...
/* EXPORTED ENCODER METHODS */
[DllImport("libspeex.dll")]
public static extern void *speex_encoder_init_new(int modeID);
[DllImport("libspeex.dll")]
public static extern int speex_encoder_ctl(void *state, int request,
void *ptr);
/* default this function doesn't exist but same job is done
speex_encoder_ctl function too. */
[DllImport("libspeex.dll")]
public static extern int speex_encoder_settings(void *state, int
complexity, int samplingrate, int quality, int bitrate);
[DllImport("libspeex.dll")]
public static extern int speex_encode_int(void *state, short *input,
SpeexBits *bits); // IntPtr
...
/* EXPORTED BIT-OPERATION METHODS */
[DllImport("libspeex.dll")]
public static extern void speex_bits_init(SpeexBits *bits);
[DllImport("libspeex.dll")]
public static extern int speex_bits_write(SpeexBits *bits, IntPtr
bytes, int max_len); // char *
...
/* some global variables */
int frame_size;
void *enc_state;
SpeexBits enc_bits;
short[] input_frame;
...
/* from Constructor */
...
enc_bits = new SpeexBits();
enc_state = speex_encoder_init_new(0);
speex_encoder_settings(enc_state, 3, 8000, 10, 11000);
fixed (int *fSize = &frame_size)
{
speex_encoder_ctl(enc_state, SPEEX_GET_FRAME_SIZE, fSize);
}
fixed (SpeexBits *bitsAdd = &enc_bits)
{
speex_bits_init(bitsAdd);
}
/* MAX_FRAME_SIZE is a constant and is 2000 */
input_frame = new short[MAX_FRAME_SIZE];
/* From Encode Function */
/* after voice data capture */
fixed (short *inputAdd = input_frame)
fixed (SpeexBits *bitsAdd = &enc_bits)
{
speex_encode_int(enc_state, inputAdd, bitsAdd);
encodedDataSize = speex_bits_write(bitsAdd, enc_outputAdd,
MAX_FRAME_BYTES);
}
fixed (SpeexBits *bitsAdd = &enc_bits)
{
speex_bits_reset(bitsAdd);
}
-----Original Message-----
From: speex-dev-request@xiph.org [mailto:speex-dev-request@xiph.org]
Sent: Thursday, December 28, 2006 10:00 PM
To: speex-dev@xiph.org
Subject: Speex-dev Digest, Vol 31, Issue 29
Send Speex-dev mailing list submissions to
speex-dev@xiph.org
To subscribe or unsubscribe via the World Wide Web, visit
http://lists.xiph.org/mailman/listinfo/speex-dev
or, via email, send a message with subject or body 'help' to
speex-dev-request@xiph.org
You can reach the person managing the list at
speex-dev-owner@xiph.org
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Speex-dev digest..."
Today's Topics:
1. using speex in C# (SAITAMA Taro)
----------------------------------------------------------------------
Message: 1
Date: Thu, 28 Dec 2006 17:09:08 +0900
From: SAITAMA Taro <game72@gmail.com>
Subject: [Speex-dev] using speex in C#
To: speex-dev@xiph.org
Message-ID: <20061228170814.9F7E.GAME72@gmail.com>
Content-Type: text/plain; charset="US-ASCII"
Hi,
I have read the message below,
http://lists.xiph.org/pipermail/speex-dev/2006-October/004924.html
and try to use P/Invoke to use speex in C#.
This is a part of my code.
[StructLayout(LayoutKind.Sequential)]
public struct SpeexBits {
IntPtr chars; // "raw" data
int nbBits; // Total number of bits
stored in the stream
int charPtr; // Position of the byte
"cursor"
int bitPtr; // Position of the bit
"cursor" within the current char
int owner; // Does the struct "own" the
"raw" buffer (member "chars")
int overflow; // Set to one if we try to
read past the valid data
int buf_size; // Allocated size for buffer
int reserved1; // Reserved for future use
IntPtr reserved2; // Reserved for future use
}
[DllImport("libspeex.dll")]
public static extern IntPtr speex_lib_get_mode(int mode); //
Obtain one of the modes available
[DllImport("libspeex.dll")]
public static extern IntPtr speex_encoder_init(ref SpeexMode mode);
[DllImport("libspeex.dll")]
public static extern void speex_bits_init(ref SpeexBits bits);
[DllImport("libspeex.dll")]
public static extern int speex_encode_int(IntPtr state, Int16[] in_,
ref SpeexBits bits);
SpeexBits bits = new SpeexBits();
SpeexMode mode (SpeexMode)Marshal.PtrToStructure(Speex.speex_lib_get_mode(1),
typeof(SpeexMode));
Speex.speex_bits_init(ref bits);
IntPtr enc_state = Speex.speex_encoder_init(ref mode);
Int16[] CaptureData = null;
(CaptureData receives data recorded from mic...)
CaptureData = (Int16[])dsCapBuffer.Read(NextCaptureOffset,
typeof(Int16), LockFlag.None, LockSize);
Speex.speex_bits_reset(ref bits);
Speex.speex_encode_int(enc_state, CaptureData, ref bits); //
at this point, System.AccessViolationException occurs
Whould anyone tell me what wrong about my code?
Please help me.
Regards
Kaihong
------------------------------
_______________________________________________
Speex-dev mailing list
Speex-dev@xiph.org
http://lists.xiph.org/mailman/listinfo/speex-dev
End of Speex-dev Digest, Vol 31, Issue 29
*****************************************
