[Speex-dev] Fw: problem in encoder/decoder

[Eid]

-------Original Message-------

 

From: Eid

Date: 10/09/05 14:07:44

To: speex-dev at xiph.org

Subject: problem in encoder/decoder

 

 

 

 

hi all,

I'm developing an app to broadcast voice over web. i tried to use speex and
download ver 1.04 documentation and use it to develop encoding and decoding
but after decoding voice is damaged i attach my encode/decode function. 

 

BOOL EncodeSpeex(CVoiceMsg *pMsg)

{

SpeexBits bits;

 

void* enc_state;

 

// Initialize.

speex_bits_init(&bits);

enc_state = speex_encoder_init(&speex_nb_mode);

 

int frame_size = 0;

// get frame size.

speex_encoder_ctl(enc_state,SPEEX_GET_FRAME_SIZE,&frame_size);

 

int nbBytes = 0;

 

//unsigned char *input_frame,*encodedstr;

unsigned char *encodedstr;

float* input_frame;//approx of frame size

 

input_frame = new float[frame_size];

encodedstr = new unsigned char[MAX_FRAME_BYTES];

 

ZeroMemory(input_frame,frame_size);

ZeroMemory(encodedstr,MAX_FRAME_BYTES);

 

int pos = 0;

unsigned char*result;

result = new unsigned char[pMsg->m_nBufferSize];

ZeroMemory(result,pMsg->m_nBufferSize);

 

int encoded_bytes =0;

 

int complexity=4;

int bitrate =3;

speex_encoder_ctl(enc_state, SPEEX_SET_COMPLEXITY, &complexity);

//speex_encoder_ctl(enc_state, SPEEX_SET_SAMPLING_RATE, &rate);

 

speex_encoder_ctl(enc_state, SPEEX_SET_BITRATE, &bitrate);

int tmp=1;

// speex_encoder_ctl(enc_state, SPEEX_SET_VAD, &tmp);

 

while(pos<pMsg->m_nBufferSize && encoded_bytes<pMsg->m_nBufferSize)

{

if((pMsg->m_nBufferSize-pos)>frame_size)

{

CopyMemory(input_frame,pMsg->m_pBuffer+pos,frame_size);

pos += frame_size;

}

else

{

CopyMemory(input_frame,pMsg->m_pBuffer+pos,pMsg->m_nBufferSize-pos);

pos+=(pMsg->m_nBufferSize-pos);

}

 

//encode input frame

speex_bits_reset(&bits);

 

speex_encode(enc_state,input_frame,&bits);

nbBytes = speex_bits_write(&bits,(char*)encodedstr,MAX_FRAME_BYTES);

 

unsigned char lenbytes[1];

lenbytes[0]=nbBytes;

 

CopyMemory(result+encoded_bytes ,lenbytes,1);

encoded_bytes++;

CopyMemory(result+encoded_bytes ,encodedstr,nbBytes);

 

encoded_bytes+= nbBytes;

 

}

 

// save again to message buffer

if(pMsg->m_pBuffer != NULL)

{

delete pMsg->m_pBuffer;

pMsg->m_pBuffer = NULL;

}

 

pMsg->m_pBuffer = new UCHAR[encoded_bytes];

CopyMemory(pMsg->m_pBuffer,result,encoded_bytes);

 

pMsg->m_nBufferSize = encoded_bytes;

 

// destroy and free resources...

speex_bits_destroy(&bits);

speex_encoder_destroy(enc_state);

 

delete[] result;

delete[] input_frame ;

delete[] encodedstr;

 

result = NULL;

input_frame = NULL;

encodedstr = NULL;

 

return TRUE;

} 

 

where pMsg->m_pBuffer is an UCHAR buffer containing recorded speech. and at
the end of encode it contains the encoded bytes.

 

BOOL DecodeSpeex(CVoiceMsg *pMsg)

{

SpeexBits bits;

 

void* dec_state;

 

// Initialize.

speex_bits_init(&bits);

dec_state = speex_decoder_init(&speex_nb_mode);

 

int frame_size = 0;

// get frame size.

speex_decoder_ctl(dec_state,SPEEX_GET_FRAME_SIZE,&frame_size);

 

int nbBytes = 0;

 

unsigned char *input_frame;

short *output_frame;

 

input_frame = new unsigned char[frame_size];

 

int enh = 1;

speex_decoder_ctl(dec_state,SPEEX_SET_ENH,&enh);

 

unsigned char*result;

int scale=25;

 

int size= max(pMsg->m_nBufferSize*scale
frame_size*scale*(pMsg->m_nBufferSize/frame_size)) + frame_size*scale;

result = new unsigned char[size];

ZeroMemory(result,size);

 

output_frame = new short[frame_size];

ZeroMemory(output_frame,frame_size);

 

float* out_float;

out_float = new float[frame_size];

ZeroMemory(out_float,frame_size);

 

int encoded_bytes =0;

int pos=0;

 

while(pos<pMsg->m_nBufferSize && encoded_bytes<size)

{

nbBytes = pMsg->m_pBuffer[pos];

if(nbBytes>frame_size)

nbBytes = frame_size;

 

if((pMsg->m_nBufferSize-pos)<nbBytes)

nbBytes = pMsg->m_nBufferSize-pos;

 

pos++;// skip lenght byte.

 

CopyMemory(input_frame,pMsg->m_pBuffer+pos,nbBytes);

 

//encode input frame.

speex_bits_read_from(&bits,(char*)input_frame,nbBytes);

speex_decode(dec_state,&bits,out_float);

//speex_decode_int(dec_state,&bits,output_frame);

//output_frame =(short*) out_float;

for(int i=0;i<frame_size;i++)

output_frame[i] = out_float[i];

pos += nbBytes;

CopyMemory(result+encoded_bytes,output_frame,frame_size);

encoded_bytes+= frame_size;

 

}

 

speex_bits_destroy(&bits);

speex_decoder_destroy(dec_state);

 

// save again to message buffer

if(pMsg->m_pBuffer != NULL)

{

delete pMsg->m_pBuffer;

pMsg->m_pBuffer = NULL;

}

 

 

pMsg->m_pBuffer = new UCHAR[encoded_bytes];

CopyMemory(pMsg->m_pBuffer,result,encoded_bytes);

 

pMsg->m_nBufferSize = encoded_bytes;

pMsg->m_nSampleSize = pMsg->m_nBufferSize / 2;//wfx2.nBlockAlign;

 

delete[] result;

delete[] output_frame ;

delete[] input_frame;

 

result = NULL;

input_frame = NULL;

output_frame = NULL;

 

return TRUE;

}