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#include "MP3Coder.h"
#include <malloc.h>
static const float const_1_div_128_ = 32768.0 / 128.0; /* 8 bit multiplier */
static const double const_1_div_2147483648_ = 32768.0 / 2147483648.0; /* 32 bit multiplier */
static void Int8_To_Float32(float *dest, void *sourceBuffer, signed int sourceStride, unsigned int count)
{
signed char *src = (signed char*)sourceBuffer;
while( count-- )
{
float samp = *src * const_1_div_128_;
*dest = samp;
src += sourceStride;
dest ++;
}
}
static void Int24_To_Float32(float *dest, void *sourceBuffer, signed int sourceStride, unsigned int count)
{
unsigned char *src = (unsigned char*)sourceBuffer;
while ( count-- )
{
signed long temp = (((long)src[0]) << 8);
temp = temp | (((long)src[1]) << 16);
temp = temp | (((long)src[2]) << 24);
*dest = (float) ((double)temp * const_1_div_2147483648_);
src += sourceStride * 3;
dest ++;
}
}
int AudioCoderMP3_24::Encode(int framepos, void *in, int in_avail, int *in_used, void *out, int out_avail)
{
if (m_err) return -1;
if (!hbeStream)
{
if (beInitStream(&beConfig, &ibuf_size_spls, &obuf_size, (PHBE_STREAM) &hbeStream) != BE_ERR_SUCCESSFUL)
{
m_err++;
return -1;
}
ibuf_size = ibuf_size_spls * bytesPerSample;
if (is_downmix) ibuf_size *= 2;
bs = (char*)malloc(ibuf_size);
bs_size = 0;
}
*in_used = 0;
int needbytes = ibuf_size - bs_size;
if (needbytes > 0 && in_avail > 0)
{
if (needbytes > in_avail)
needbytes = in_avail;
memcpy(bs + bs_size, in, needbytes);
bs_size += needbytes;
*in_used = needbytes;
}
if (!done)
{
if (bs_size < (int)ibuf_size) return 0;
}
if (out_avail < (int)obuf_size) return 0;
int feedBytes = min(bs_size, (int)ibuf_size);
int feedSamples = feedBytes / bytesPerSample;
bs_size -= feedBytes;
/*
if (is_downmix)
{
int x;
int l = feedBytes / 4;
short *b = (short*)bs;
for (x = 0; x < l; x ++)
{
b[x] = b[x * 2] / 2 + b[x * 2 + 1] / 2;
}
}
*/
DWORD dwo = 0;
if (feedSamples)
{
if (mono_input)
{
float *float_l = (float *)alloca(sizeof(float) * feedSamples);
switch(bytesPerSample)
{
case 8:
Int8_To_Float32(float_l, bs, 1, feedSamples);
break;
case 24:
Int24_To_Float32(float_l, bs, 1, feedSamples);
break;
}
if (beEncodeChunkFloatS16NI(hbeStream, feedSamples, float_l, float_l, (unsigned char *)out, &dwo) != BE_ERR_SUCCESSFUL)
{
m_err++;
return -1;
}
}
else
{
float *float_l = (float *)alloca(sizeof(float) * feedSamples / 2);
float *float_r = (float *)alloca(sizeof(float) * feedSamples / 2);
switch(bytesPerSample)
{
case 1: // 8 bit
Int8_To_Float32(float_l, bs, 2, feedSamples / 2);
Int8_To_Float32(float_r, bs + 1, 2, feedSamples / 2);
break;
case 3: // 24 bit
Int24_To_Float32(float_l, bs, 2, feedSamples / 2);
Int24_To_Float32(float_r, bs + 3, 2, feedSamples / 2);
break;
}
if (beEncodeChunkFloatS16NI(hbeStream, feedSamples / 2, float_l, float_r, (unsigned char *)out, &dwo) != BE_ERR_SUCCESSFUL)
{
m_err++;
return -1;
}
}
}
if (!dwo && done == 1)
{
if (beDeinitStream(hbeStream, (unsigned char *)out, &dwo) != BE_ERR_SUCCESSFUL)
{
m_err++;
return -1;
}
done++;
}
return dwo;
}
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