Fix T71322: Crash in Audaspace with some video file

Getting upstream audaspace fixes for audio files with more than 8
channels.

extern/audaspace/plugins/openal/OpenALDevice.cpp

@@ -1167,7 +1167,8 @@ OpenALDevice::OpenALDevice(DeviceSpecs specs, int buffersize, std::string name)
 
 	if((!m_useMC && specs.channels > CHANNELS_STEREO) ||
 			specs.channels == CHANNELS_STEREO_LFE ||
-			specs.channels == CHANNELS_SURROUND5)
+			specs.channels == CHANNELS_SURROUND5 ||
+			specs.channels > CHANNELS_SURROUND71)
 		specs.channels = CHANNELS_STEREO;
 
 	alGetError();

extern/audaspace/src/respec/ChannelMapperReader.cpp

@@ -97,12 +97,15 @@ void ChannelMapperReader::calculateMapping()
 	for(int i = 0; i < m_source_channels * m_target_channels; i++)
 		m_mapping[i] = 0;
 
-	const Channel* source_channels = CHANNEL_MAPS[m_source_channels - 1];
-	const Channel* target_channels = CHANNEL_MAPS[m_target_channels - 1];
+	const Channels source_channel_count = std::min(m_source_channels, CHANNELS_SURROUND71);
+	const Channels target_channel_count = std::min(m_target_channels, CHANNELS_SURROUND71);
+
+	const Channel* source_channels = CHANNEL_MAPS[source_channel_count - 1];
+	const Channel* target_channels = CHANNEL_MAPS[target_channel_count - 1];
 
 	int lfe = -1;
 
-	for(int i = 0; i < m_target_channels; i++)
+	for(int i = 0; i < target_channel_count; i++)
 	{
 		if(target_channels[i] == CHANNEL_LFE)
 		{
@@ -111,16 +114,16 @@ void ChannelMapperReader::calculateMapping()
 		}
 	}
 
-	const float* source_angles = CHANNEL_ANGLES[m_source_channels - 1];
-	const float* target_angles = CHANNEL_ANGLES[m_target_channels - 1];
+	const float* source_angles = CHANNEL_ANGLES[source_channel_count - 1];
+	const float* target_angles = CHANNEL_ANGLES[target_channel_count - 1];
 
-	if(m_source_channels == CHANNELS_MONO)
+	if(source_channel_count == CHANNELS_MONO)
 		source_angles = &m_mono_angle;
 
 	int channel_left, channel_right;
 	float angle_left, angle_right, angle;
 
-	for(int i = 0; i < m_source_channels; i++)
+	for(int i = 0; i < source_channel_count; i++)
 	{
 		if(source_channels[i] == CHANNEL_LFE)
 		{
@@ -134,7 +137,7 @@ void ChannelMapperReader::calculateMapping()
 		angle_left = -2 * M_PI;
 		angle_right = 2 * M_PI;
 
-		for(int j = 0; j < m_target_channels; j++)
+		for(int j = 0; j < target_channel_count; j++)
 		{
 			if(j == lfe)
 				continue;