func getModeFilter(fh *mp3agic.FrameHeader) uint32 {
if fh.Verify() != nil {
return 0
}
if fh.Channels() == 1 {
return FILTER_MONO
}
return FILTER_STEREO
}
func getLayerFilter(fh *mp3agic.FrameHeader) uint32 {
if fh.Verify() != nil {
return 0
}
switch fh.Layer() {
case mp3agic.MPEG_LAYER_1:
return FILTER_LAYER1
case mp3agic.MPEG_LAYER_2:
return FILTER_LAYER2
case mp3agic.MPEG_LAYER_3:
return FILTER_LAYER3
}
return 0
}
func getSamplingrateFilter(fh *mp3agic.FrameHeader) uint32 {
if fh.Verify() != nil {
return 0
}
switch fh.SampleRate() {
case 32000, 16000, 8000:
return FILTER_32000HZ
case 44100, 22050, 11025:
return FILTER_44100HZ
case 48000, 24000, 12000:
return FILTER_48000HZ
}
return 0
}
func getMpegFilter(fh *mp3agic.FrameHeader) uint32 {
if fh.Verify() != nil {
return 0
}
switch fh.Version() {
case mp3agic.MPEG_VERSION_1_0:
return FILTER_MPEG1
case mp3agic.MPEG_VERSION_2_0:
return FILTER_MPEG2
case mp3agic.MPEG_VERSION_2_5:
return FILTER_MPEG25
}
return 0
}
