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Audaspace:

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Fix for channel mapping bug. Now 7.1 channels should get mapped correctly.
This commit is contained in:
Joerg Mueller 2012-10-25 10:25:30 +00:00
parent 0632da0829
commit ad2dffe7c6
1 changed files with 30 additions and 20 deletions
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50
intern/audaspace/intern/AUD_ChannelMapperReader.cpp
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@ -67,10 +67,12 @@ void AUD_ChannelMapperReader::setMonoAngle(float angle)
float AUD_ChannelMapperReader::angleDistance(float alpha, float beta)
{
alpha = fabs(alpha - beta);
alpha = beta - alpha;
if(alpha > M_PI)
alpha = fabs(alpha - 2 * M_PI);
alpha -= 2 * M_PI;
if(alpha < -M_PI)
alpha += 2 * M_PI;
return alpha;
}
@ -107,8 +109,8 @@ void AUD_ChannelMapperReader::calculateMapping()
if(m_source_channels == AUD_CHANNELS_MONO)
source_angles = &m_mono_angle;
int channel_min1, channel_min2;
float angle_min1, angle_min2, angle;
int channel_left, channel_right;
float angle_left, angle_right, angle;
for(int i = 0; i < m_source_channels; i++)
{
@ -120,38 +122,46 @@ void AUD_ChannelMapperReader::calculateMapping()
continue;
}
channel_min1 = channel_min2 = -1;
angle_min1 = angle_min2 = 2 * M_PI;
channel_left = channel_right = -1;
angle_left = -2 * M_PI;
angle_right = 2 * M_PI;
for(int j = 0; j < m_target_channels; j++)
{
if(j == lfe)
continue;
angle = angleDistance(source_angles[i], target_angles[j]);
if(angle < angle_min1)
if(angle < 0)
{
channel_min2 = channel_min1;
angle_min2 = angle_min1;
channel_min1 = j;
angle_min1 = angle;
if(angle > angle_left)
{
angle_left = angle;
channel_left = j;
}
}
else if(angle < angle_min2)
else
{
channel_min2 = j;
angle_min2 = angle;
if(angle < angle_right)
{
angle_right = angle;
channel_right = j;
}
}
}
angle = angle_min1 + angle_min2;
if(channel_min2 == -1 || angle == 0)
angle = angle_right - angle_left;
if(channel_right == -1 || angle == 0)
{
m_mapping[channel_min1 * m_source_channels + i] = 1;
m_mapping[channel_left * m_source_channels + i] = 1;
}
else if(channel_left == -1)
{
m_mapping[channel_right * m_source_channels + i] = 1;
}
else
{
m_mapping[channel_min1 * m_source_channels + i] = cos(M_PI_2 * angle_min1 / angle);
m_mapping[channel_min2 * m_source_channels + i] = cos(M_PI_2 * angle_min2 / angle);
m_mapping[channel_left * m_source_channels + i] = cos(M_PI_2 * angle_left / angle);
m_mapping[channel_right * m_source_channels + i] = cos(M_PI_2 * angle_right / angle);
}
}