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#include "gvSpeex.h"
#include <speex.h>
#include "gvCodec.h"
static GVBool gviSpeexInitialized;
static void * gviSpeexEncoderState;
static SpeexBits gviSpeexBits;
static int gviSpeexEncodedFrameSize;
static int gviSpeexSamplesPerFrame;
//Encode/Decode buffer.
static float * gviSpeexBuffer;
GVBool gviSpeexInitialize(int quality, GVRate sampleRate)
{
int rate;
int bitsPerFrame;
int samplesPerSecond;
// we shouldn't already be initialized
if(gviSpeexInitialized)
return GVFalse;
// create a new encoder state
if (sampleRate == GVRate_8KHz)
gviSpeexEncoderState = speex_encoder_init(&speex_nb_mode);
else if (sampleRate == GVRate_16KHz)
gviSpeexEncoderState = speex_encoder_init(&speex_wb_mode);
else
return GVFalse;
if(!gviSpeexEncoderState)
return GVFalse;
// set the sampling rate
samplesPerSecond = sampleRate;
speex_encoder_ctl(gviSpeexEncoderState, SPEEX_SET_SAMPLING_RATE, &samplesPerSecond);
// Get the samples per frame setting.
speex_encoder_ctl(gviSpeexEncoderState, SPEEX_GET_FRAME_SIZE, &gviSpeexSamplesPerFrame);
// set the quality
speex_encoder_ctl(gviSpeexEncoderState, SPEEX_SET_QUALITY, &quality);
// initialize the bits struct
speex_bits_init(&gviSpeexBits);
// get the bitrate
speex_encoder_ctl(gviSpeexEncoderState, SPEEX_GET_BITRATE, &rate);
// convert to bits per frame
bitsPerFrame = (rate / (sampleRate / gviSpeexSamplesPerFrame));
// convert to bytes per frame and store, round up to allocate more space than needed.
gviSpeexEncodedFrameSize = (bitsPerFrame / 8);
if (bitsPerFrame % 8)
gviSpeexEncodedFrameSize++;
// create our encoding and decoding buffer.
gviSpeexBuffer = (float *)gsimalloc(gviSpeexSamplesPerFrame * sizeof(float));
// we're now initialized
gviSpeexInitialized = GVTrue;
return GVTrue;
}
void gviSpeexCleanup(void)
{
// make sure there is something to cleanup
if(!gviSpeexInitialized)
return;
// free up encoding and decoding buffer.
gsifree(gviSpeexBuffer);
// destroy the encoder state
speex_encoder_destroy(gviSpeexEncoderState);
gviSpeexEncoderState = NULL;
// destroy the bits struct
speex_bits_destroy(&gviSpeexBits);
// no longer initialized
gviSpeexInitialized = GVFalse;
}
int gviSpeexGetSamplesPerFrame(void)
{
return gviSpeexSamplesPerFrame;
}
int gviSpeexGetEncodedFrameSize(void)
{
return gviSpeexEncodedFrameSize;
}
GVBool gviSpeexNewDecoder(GVDecoderData * data)
{
void * decoder;
int perceptualEnhancement = 1;
// create a new decoder state
if (gviGetSampleRate() == GVRate_8KHz)
decoder = speex_decoder_init(&speex_nb_mode);
else if (gviGetSampleRate() == GVRate_16KHz)
decoder = speex_decoder_init(&speex_wb_mode);
else
return GVFalse;
if(!decoder)
return GVFalse;
// turn on the perceptual enhancement
speex_decoder_ctl(decoder, SPEEX_SET_ENH, &perceptualEnhancement);
*data = decoder;
return GVTrue;
}
void gviSpeexFreeDecoder(GVDecoderData data)
{
// destory the decoder state
speex_decoder_destroy((void *)data);
}
void gviSpeexEncode(GVByte * out, const GVSample * in)
{
int bytesWritten;
int i;
// convert the input to floats for encoding
for(i = 0 ; i < gviSpeexSamplesPerFrame ; i++)
gviSpeexBuffer[i] = in[i];
// flush the bits
speex_bits_reset(&gviSpeexBits);
// encode the frame
speex_encode(gviSpeexEncoderState, gviSpeexBuffer, &gviSpeexBits);
// write the bits to the output
bytesWritten = speex_bits_write(&gviSpeexBits, (char *)out, gviSpeexEncodedFrameSize);
assert(bytesWritten == gviSpeexEncodedFrameSize);
}
void gviSpeexDecodeAdd(GVSample * out, const GVByte * in, GVDecoderData data)
{
int rcode;
int i;
// read the data into the bits
speex_bits_read_from(&gviSpeexBits, (char *)in, gviSpeexEncodedFrameSize);
// decode it
rcode = speex_decode((void *)data, &gviSpeexBits, gviSpeexBuffer);
assert(rcode == 0);
// convert the output from floats
for(i = 0 ; i < gviSpeexSamplesPerFrame ; i++)
// Expanded to remove warnings in VS2K5
out[i] = out[i] + (GVSample)gviSpeexBuffer[i];
}
void gviSpeexDecodeSet(GVSample * out, const GVByte * in, GVDecoderData data)
{
int rcode;
int i;
// read the data into the bits
speex_bits_read_from(&gviSpeexBits, (char *)in, gviSpeexEncodedFrameSize);
// decode it
rcode = speex_decode((void *)data, &gviSpeexBits, gviSpeexBuffer);
assert(rcode == 0);
// convert the output from floats
for(i = 0 ; i < gviSpeexSamplesPerFrame ; i++)
out[i] = (GVSample)gviSpeexBuffer[i];
}
void gviSpeexResetEncoder(void)
{
// reset the encoder's state
speex_encoder_ctl(gviSpeexEncoderState, SPEEX_RESET_STATE, NULL);
}
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