public unsafe void read(long start, int length, ref IntPtr ptr_left, ref IntPtr ptr_right)
{
float *left = (float *)ptr_left.ToPointer();
float *right = (float *)ptr_right.ToPointer();
if (!m_opened)
{
return;
}
int i_start = 0;
int i_end = length;
long required_sample_start = start + (long)(m_offset_seconds * m_sample_per_sec);
long required_sample_end = required_sample_start + length;
// 第required_sample_startサンプルから，第required_sample_endサンプルまでの読み込みが要求された．
if (required_sample_start < 0)
{
i_start = -(int)required_sample_start + 1;
// 0 -> i_start - 1までは0で埋める
for (int i = 0; i < i_start; i++)
{
left[i] = 0.0f;
right[i] = 0.0f;
}
m_stream.Seek(m_header_offset, SeekOrigin.Begin);
}
else
{
long loc = m_header_offset + m_byte_per_sample * m_channel * required_sample_start;
m_stream.Seek(loc, SeekOrigin.Begin);
}
if (m_total_samples < required_sample_end)
{
i_end = length - 1 - (int)required_sample_end + m_total_samples;
// i_end + 1 -> length - 1までは0で埋める
for (int i = i_end + 1; i < length; i++)
{
left[i] = 0.0f;
right[i] = 0.0f;
}
}
if (m_byte_per_sample == 2)
{
if (m_channel == 2)
{
byte[] buf = new byte[4];
float coeff_left = (float)(m_amplify_left / 32768.0f);
float coeff_right = (float)(m_amplify_right / 32768.0f);
for (int i = 0; i < length; i++)
{
int ret = m_stream.Read(buf, 0, 4);
if (ret < 4)
{
for (int j = i; j < length; j++)
{
left[j] = 0.0f;
right[j] = 0.0f;
}
break;
}
short l = PortUtil.make_int16_le(buf, 0);
short r = PortUtil.make_int16_le(buf, 2);
left[i] = l * coeff_left;
right[i] = r * coeff_right;
}
}
else
{
byte[] buf = new byte[2];
float coeff_left = (float)(m_amplify_left / 32768.0f);
for (int i = 0; i < length; i++)
{
int ret = m_stream.Read(buf, 0, 2);
if (ret < 2)
{
for (int j = i; j < length; j++)
{
left[j] = 0.0f;
right[j] = 0.0f;
}
break;
}
short l = PortUtil.make_int16_le(buf, 0);
left[i] = l * coeff_left;
right[i] = left[i];
}
}
}
else
{
if (m_channel == 2)
{
byte[] buf = new byte[2];
float coeff_left = (float)(m_amplify_left / 64.0f);
float coeff_right = (float)(m_amplify_right / 64.0f);
for (int i = 0; i < length; i++)
{
int ret = m_stream.Read(buf, 0, 2);
if (ret < 2)
{
for (int j = i; j < length; j++)
{
left[j] = 0.0f;
right[j] = 0.0f;
}
break;
}
left[i] = ((0xff & buf[0]) - 64.0f) * coeff_left;
right[i] = ((0xff & buf[1]) - 64.0f) * coeff_right;
}
}
else
{
byte[] buf = new byte[1];
float coeff_left = (float)(m_amplify_left / 64.0f);
for (int i = 0; i < length; i++)
{
int ret = m_stream.Read(buf, 0, 1);
if (ret < 1)
{
for (int j = i; j < length; j++)
{
left[j] = 0.0f;
right[j] = 0.0f;
}
break;
}
left[i] = ((0xff & buf[0]) - 64.0f) * coeff_left;
right[i] = left[i];
}
}
}
}
public void read(long start, int length, double[] left, double[] right)
{
for (int i = 0; i < length; i++)
{
left[i] = 0.0;
right[i] = 0.0;
}
//left = new double[length];
//right = new double[length];
if (!m_opened)
{
return;
}
int i_start = 0;
int i_end = length - 1;
long required_sample_start = start + (long)(m_offset_seconds * m_sample_per_sec);
long required_sample_end = required_sample_start + length;
// 第required_sample_startサンプルから，第required_sample_endサンプルまでの読み込みが要求された．
if (required_sample_start < 0)
{
i_start = -(int)required_sample_start + 1;
// 0 -> i_start - 1までは0で埋める
if (i_start >= length)
{
// 全部0で埋める必要のある場合.
for (int i = 0; i < length; i++)
{
left[i] = 0.0;
right[i] = 0.0;
}
return;
}
else
{
for (int i = 0; i < i_start; i++)
{
left[i] = 0.0;
right[i] = 0.0;
}
}
m_stream.Seek(m_header_offset, SeekOrigin.Begin);
}
else
{
long loc = m_header_offset + m_byte_per_sample * m_channel * required_sample_start;
m_stream.Seek(loc, SeekOrigin.Begin);
}
if (m_total_samples < required_sample_end)
{
i_end = length - 1 - (int)required_sample_end + m_total_samples;
// i_end + 1 -> length - 1までは0で埋める
if (i_end < 0)
{
// 全部0で埋める必要のある場合
for (int i = 0; i < length; i++)
{
left[i] = 0.0;
right[i] = 0.0;
}
return;
}
else
{
for (int i = i_end + 1; i < length; i++)
{
left[i] = 0.0;
right[i] = 0.0;
}
}
}
if (m_byte_per_sample == 2)
{
if (m_channel == 2)
{
byte[] buf = new byte[4];
double coeff_left = m_amplify_left / 32768.0;
double coeff_right = m_amplify_right / 32768.0;
for (int i = i_start; i <= i_end; i++)
{
int ret = m_stream.Read(buf, 0, 4);
if (ret < 4)
{
for (int j = i; j < length; j++)
{
left[j] = 0.0f;
right[j] = 0.0f;
}
break;
}
short l = PortUtil.make_int16_le(buf, 0);
short r = PortUtil.make_int16_le(buf, 2);
left[i] = l * coeff_left;
right[i] = r * coeff_right;
}
}
else
{
byte[] buf = new byte[2];
double coeff_left = m_amplify_left / 32768.0;
for (int i = i_start; i <= i_end; i++)
{
int ret = m_stream.Read(buf, 0, 2);
if (ret < 2)
{
for (int j = i; j < length; j++)
{
left[j] = 0.0f;
right[j] = 0.0f;
}
break;
}
short l = PortUtil.make_int16_le(buf, 0);
left[i] = l * coeff_left;
right[i] = left[i];
}
}
}
else
{
if (m_channel == 2)
{
byte[] buf = new byte[2];
double coeff_left = m_amplify_left / 64.0;
double coeff_right = m_amplify_right / 64.0;
for (int i = i_start; i <= i_end; i++)
{
int ret = m_stream.Read(buf, 0, 2);
if (ret < 2)
{
for (int j = i; j < length; j++)
{
left[j] = 0.0f;
right[j] = 0.0f;
}
break;
}
left[i] = ((0xff & buf[0]) - 64.0f) * coeff_left;
right[i] = ((0xff & buf[1]) - 64.0f) * coeff_right;
}
}
else
{
byte[] buf = new byte[1];
double coeff_left = m_amplify_left / 64.0;
for (int i = i_start; i <= i_end; i++)
{
int ret = m_stream.Read(buf, 0, 1);
if (ret < 1)
{
for (int j = i; j < length; j++)
{
left[j] = 0.0f;
right[j] = 0.0f;
}
break;
}
left[i] = ((0xff & buf[0]) - 64.0f) * coeff_left;
right[i] = left[i];
}
}
}
}
