SharedPtr<Decoder> SndFileDecoderFactory::createDecoder(UniquePtr<std::istream> &file)
{
SF_VIRTUAL_IO vio = {
get_filelen, seek,
read, write, tell
};
SF_INFO sndinfo;
SNDFILE *sndfile = sf_open_virtual(&vio, SFM_READ, &sndinfo, file.get());
if(!sndfile) return nullptr;
ChannelConfig sconfig;
Vector<int> chanmap(sndinfo.channels);
if(sf_command(sndfile, SFC_GET_CHANNEL_MAP_INFO, &chanmap[0], chanmap.size()*sizeof(int)) == SF_TRUE)
{
auto matches = [](const Vector<int> &first, std::initializer_list<int> second) -> bool
{
if(first.size() != second.size())
return false;
return std::mismatch(first.begin(), first.end(), second.begin()).first == first.end();
};
if(matches(chanmap, {SF_CHANNEL_MAP_MONO}))
sconfig = ChannelConfig::Mono;
else if(matches(chanmap, {SF_CHANNEL_MAP_LEFT, SF_CHANNEL_MAP_RIGHT}))
sconfig = ChannelConfig::Stereo;
else if(matches(chanmap, {SF_CHANNEL_MAP_REAR_LEFT, SF_CHANNEL_MAP_REAR_RIGHT}))
sconfig = ChannelConfig::Rear;
else if(matches(chanmap, {SF_CHANNEL_MAP_LEFT, SF_CHANNEL_MAP_RIGHT,
SF_CHANNEL_MAP_REAR_LEFT, SF_CHANNEL_MAP_REAR_RIGHT}))
sconfig = ChannelConfig::Quad;
else if(matches(chanmap, {SF_CHANNEL_MAP_LEFT, SF_CHANNEL_MAP_RIGHT,
SF_CHANNEL_MAP_CENTER, SF_CHANNEL_MAP_LFE,
SF_CHANNEL_MAP_REAR_LEFT, SF_CHANNEL_MAP_REAR_RIGHT}) ||
matches(chanmap, {SF_CHANNEL_MAP_LEFT, SF_CHANNEL_MAP_RIGHT,
SF_CHANNEL_MAP_CENTER, SF_CHANNEL_MAP_LFE,
SF_CHANNEL_MAP_SIDE_LEFT, SF_CHANNEL_MAP_SIDE_RIGHT}))
sconfig = ChannelConfig::X51;
else if(matches(chanmap, {SF_CHANNEL_MAP_LEFT, SF_CHANNEL_MAP_RIGHT,
SF_CHANNEL_MAP_CENTER, SF_CHANNEL_MAP_LFE,
SF_CHANNEL_MAP_REAR_CENTER, SF_CHANNEL_MAP_SIDE_LEFT,
SF_CHANNEL_MAP_SIDE_RIGHT}))
sconfig = ChannelConfig::X61;
else if(matches(chanmap, {SF_CHANNEL_MAP_LEFT, SF_CHANNEL_MAP_RIGHT,
SF_CHANNEL_MAP_CENTER, SF_CHANNEL_MAP_LFE,
SF_CHANNEL_MAP_REAR_LEFT, SF_CHANNEL_MAP_REAR_RIGHT,
SF_CHANNEL_MAP_SIDE_LEFT, SF_CHANNEL_MAP_SIDE_RIGHT}))
sconfig = ChannelConfig::X71;
else if(matches(chanmap, {SF_CHANNEL_MAP_AMBISONIC_B_W, SF_CHANNEL_MAP_AMBISONIC_B_X,
SF_CHANNEL_MAP_AMBISONIC_B_Y}))
sconfig = ChannelConfig::BFormat2D;
else if(matches(chanmap, {SF_CHANNEL_MAP_AMBISONIC_B_W, SF_CHANNEL_MAP_AMBISONIC_B_X,
SF_CHANNEL_MAP_AMBISONIC_B_Y, SF_CHANNEL_MAP_AMBISONIC_B_Z}))
sconfig = ChannelConfig::BFormat3D;
else
{
sf_close(sndfile);
return nullptr;
}
}
else if(sf_command(sndfile, SFC_WAVEX_GET_AMBISONIC, 0, 0) == SF_AMBISONIC_B_FORMAT)
{
if(sndinfo.channels == 3)
sconfig = ChannelConfig::BFormat2D;
else if(sndinfo.channels == 4)
sconfig = ChannelConfig::BFormat3D;
else
{
sf_close(sndfile);
return nullptr;
}
}
else if(sndinfo.channels == 1)
sconfig = ChannelConfig::Mono;
else if(sndinfo.channels == 2)
sconfig = ChannelConfig::Stereo;
else
{
sf_close(sndfile);
return nullptr;
}
SampleType stype = SampleType::Int16;
switch(sndinfo.format&SF_FORMAT_SUBMASK)
{
case SF_FORMAT_FLOAT:
case SF_FORMAT_DOUBLE:
case SF_FORMAT_VORBIS:
stype = SampleType::Float32;
break;
default:
stype = SampleType::Int16;
break;
}
return MakeShared<SndFileDecoder>(std::move(file), sndfile, sndinfo, sconfig, stype);
}
SharedPtr<Decoder> SndFileDecoderFactory::createDecoder(SharedPtr<std::istream> file)
{
SF_VIRTUAL_IO vio = {
get_filelen, seek,
read, write, tell
};
SF_INFO sndinfo;
SNDFILE *sndfile = sf_open_virtual(&vio, SFM_READ, &sndinfo, file.get());
ChannelConfig sconfig;
if(sndfile)
{
Vector<int> chanmap(sndinfo.channels);
if(sf_command(sndfile, SFC_GET_CHANNEL_MAP_INFO, &chanmap[0], chanmap.size()*sizeof(int)) == SF_TRUE)
{
if(sndinfo.channels == 1 && chanmap[0] == SF_CHANNEL_MAP_MONO)
sconfig = ChannelConfig_Mono;
else if(sndinfo.channels == 2 &&
chanmap[0] == SF_CHANNEL_MAP_LEFT && chanmap[1] == SF_CHANNEL_MAP_RIGHT)
sconfig = ChannelConfig_Stereo;
else if(sndinfo.channels == 2 &&
chanmap[0] == SF_CHANNEL_MAP_REAR_LEFT && chanmap[1] == SF_CHANNEL_MAP_REAR_RIGHT)
sconfig = ChannelConfig_Rear;
else if(sndinfo.channels == 4 &&
chanmap[0] == SF_CHANNEL_MAP_LEFT && chanmap[1] == SF_CHANNEL_MAP_RIGHT &&
chanmap[2] == SF_CHANNEL_MAP_REAR_LEFT && chanmap[3] == SF_CHANNEL_MAP_REAR_RIGHT)
sconfig = ChannelConfig_Quad;
else if(sndinfo.channels == 6 &&
chanmap[0] == SF_CHANNEL_MAP_LEFT && chanmap[1] == SF_CHANNEL_MAP_RIGHT &&
chanmap[2] == SF_CHANNEL_MAP_CENTER && chanmap[3] == SF_CHANNEL_MAP_LFE &&
chanmap[4] == SF_CHANNEL_MAP_REAR_LEFT && chanmap[5] == SF_CHANNEL_MAP_REAR_RIGHT)
sconfig = ChannelConfig_X51;
else if(sndinfo.channels == 6 &&
chanmap[0] == SF_CHANNEL_MAP_LEFT && chanmap[1] == SF_CHANNEL_MAP_RIGHT &&
chanmap[2] == SF_CHANNEL_MAP_CENTER && chanmap[3] == SF_CHANNEL_MAP_LFE &&
chanmap[4] == SF_CHANNEL_MAP_SIDE_LEFT && chanmap[5] == SF_CHANNEL_MAP_SIDE_RIGHT)
sconfig = ChannelConfig_X51;
else if(sndinfo.channels == 7 &&
chanmap[0] == SF_CHANNEL_MAP_LEFT && chanmap[1] == SF_CHANNEL_MAP_RIGHT &&
chanmap[2] == SF_CHANNEL_MAP_CENTER && chanmap[3] == SF_CHANNEL_MAP_LFE &&
chanmap[4] == SF_CHANNEL_MAP_REAR_CENTER && chanmap[5] == SF_CHANNEL_MAP_SIDE_LEFT &&
chanmap[6] == SF_CHANNEL_MAP_SIDE_RIGHT)
sconfig = ChannelConfig_X61;
else if(sndinfo.channels == 8 &&
chanmap[0] == SF_CHANNEL_MAP_LEFT && chanmap[1] == SF_CHANNEL_MAP_RIGHT &&
chanmap[2] == SF_CHANNEL_MAP_CENTER && chanmap[3] == SF_CHANNEL_MAP_LFE &&
chanmap[4] == SF_CHANNEL_MAP_REAR_LEFT && chanmap[5] == SF_CHANNEL_MAP_REAR_RIGHT &&
chanmap[6] == SF_CHANNEL_MAP_SIDE_LEFT && chanmap[7] == SF_CHANNEL_MAP_SIDE_RIGHT)
sconfig = ChannelConfig_X51;
else if(sndinfo.channels == 3 &&
chanmap[0] == SF_CHANNEL_MAP_AMBISONIC_B_W && chanmap[1] == SF_CHANNEL_MAP_AMBISONIC_B_X &&
chanmap[2] == SF_CHANNEL_MAP_AMBISONIC_B_Y)
sconfig = ChannelConfig_BFmt_WXY;
else if(sndinfo.channels == 4 &&
chanmap[0] == SF_CHANNEL_MAP_AMBISONIC_B_W && chanmap[1] == SF_CHANNEL_MAP_AMBISONIC_B_X &&
chanmap[2] == SF_CHANNEL_MAP_AMBISONIC_B_Y && chanmap[3] == SF_CHANNEL_MAP_AMBISONIC_B_Z)
sconfig = ChannelConfig_BFmt_WXYZ;
else
{
sf_close(sndfile);
return 0;
}
}
else if(sf_command(sndfile, SFC_WAVEX_GET_AMBISONIC, 0, 0) == SF_AMBISONIC_B_FORMAT)
{
if(sndinfo.channels == 3)
sconfig = ChannelConfig_BFmt_WXY;
else if(sndinfo.channels == 4)
sconfig = ChannelConfig_BFmt_WXYZ;
else
{
sf_close(sndfile);
return 0;
}
}
else if(sndinfo.channels == 1)
sconfig = ChannelConfig_Mono;
else if(sndinfo.channels == 2)
sconfig = ChannelConfig_Stereo;
else
{
sf_close(sndfile);
return 0;
}
}
SampleType stype = SampleType_Int16;
if(sndfile)
{
switch(sndinfo.format&SF_FORMAT_SUBMASK)
{
case SF_FORMAT_FLOAT:
case SF_FORMAT_DOUBLE:
case SF_FORMAT_VORBIS:
stype = SampleType_Float32;
break;
default:
stype = SampleType_Int16;
break;
}
}
if(!sndfile) return SharedPtr<Decoder>(nullptr);
return SharedPtr<Decoder>(new SndFileDecoder(file, sndfile, sndinfo, sconfig, stype));
}