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#include "gvGSM.h"
#include <gsm.h>
// these are standard for GSM
#define GVI_SAMPLES_PER_FRAME 160
#define GVI_ENCODED_FRAME_SIZE 33
static GVBool gviGSMInitialized;
static gsm gviGSMEncoderState;
GVBool gviGSMInitialize(void)
{
const int gsm_ltp = 1;
// we shouldn't already be initialized
if(gviGSMInitialized)
return GVFalse;
// create a new encoder state
gviGSMEncoderState = gsm_create();
if(!gviGSMEncoderState)
return GVFalse;
// set the LTP cut option
gsm_option(gviGSMEncoderState, GSM_OPT_LTP_CUT, &gsm_ltp);
// we're now initialized
gviGSMInitialized = GVTrue;
return GVTrue;
}
void gviGSMCleanup(void)
{
// make sure there is something to cleanup
if(!gviGSMInitialized)
return;
// destroy the encoder state
gsm_destroy(gviGSMEncoderState);
gviGSMEncoderState = NULL;
// no longer initialized
gviGSMInitialized = GVFalse;
}
int gviGSMGetSamplesPerFrame(void)
{
return GVI_SAMPLES_PER_FRAME;
}
int gviGSMGetEncodedFrameSize(void)
{
return GVI_ENCODED_FRAME_SIZE;
}
GVBool gviGSMNewDecoder(GVDecoderData * data)
{
gsm decoder;
// create a new decoder state
decoder = gsm_create();
if(!decoder)
return GVFalse;
*data = decoder;
return GVTrue;
}
void gviGSMFreeDecoder(GVDecoderData data)
{
// destory the decoder state
gsm_destroy((gsm)data);
}
void gviGSMEncode(GVByte * out, const GVSample * in)
{
gsm_encode((gsm)gviGSMEncoderState, (gsm_signal*)in, (gsm_byte*)out);
}
void gviGSMDecodeAdd(GVSample * out, const GVByte * in, GVDecoderData data)
{
GVSample temp[GVI_SAMPLES_PER_FRAME];
int i;
// decode it
gsm_decode((gsm)data, (gsm_byte*)in, (gsm_signal*)temp);
// add the output
for(i = 0 ; i < GVI_SAMPLES_PER_FRAME ; i++)
out[i] += temp[i];
}
void gviGSMDecodeSet(GVSample * out, const GVByte * in, GVDecoderData data)
{
gsm_decode((gsm)data, (gsm_byte*)in, (gsm_signal*)out);
}
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