mirror of
https://github.com/wader/fq.git
synced 2024-11-24 11:16:09 +03:00
e9d9f8aef9
Rename s/interface{}/any/g
Preparation for using generics in decode API and native jq funcations etc
Remove some unused linter ignores as linter has been fixed
56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
package mpeg
|
|
|
|
// https://wiki.multimedia.cx/index.php/MPEG-4_Audio
|
|
|
|
import (
|
|
"github.com/wader/fq/format"
|
|
"github.com/wader/fq/format/registry"
|
|
"github.com/wader/fq/pkg/decode"
|
|
"github.com/wader/fq/pkg/scalar"
|
|
)
|
|
|
|
func init() {
|
|
registry.MustRegister(decode.Format{
|
|
Name: format.MPEG_ASC,
|
|
Description: "MPEG-4 Audio Specific Config",
|
|
DecodeFn: ascDecoder,
|
|
})
|
|
}
|
|
|
|
var frequencyIndexHzMap = scalar.UToSymU{
|
|
0x0: 96000,
|
|
0x1: 88200,
|
|
0x2: 64000,
|
|
0x3: 48000,
|
|
0x4: 44100,
|
|
0x5: 32000,
|
|
0x6: 24000,
|
|
0x7: 22050,
|
|
0x8: 16000,
|
|
0x9: 12000,
|
|
0xa: 11025,
|
|
0xb: 8000,
|
|
0xc: 7350,
|
|
}
|
|
|
|
var channelConfigurationNames = scalar.UToDescription{
|
|
0: "defined in AOT Specifc Config",
|
|
1: "front-center",
|
|
2: "front-left, front-right",
|
|
3: "front-center, front-left, front-right",
|
|
4: "front-center, front-left, front-right, back-center",
|
|
5: "front-center, front-left, front-right, back-left, back-right",
|
|
6: "front-center, front-left, front-right, back-left, back-right, LFE-channel",
|
|
7: "front-center, front-left, front-right, side-left, side-right, back-left, back-right, LFE-channel",
|
|
}
|
|
|
|
func ascDecoder(d *decode.D, in any) any {
|
|
objectType := d.FieldUFn("object_type", decodeEscapeValueCarryFn(5, 6, 0), format.MPEGAudioObjectTypeNames)
|
|
d.FieldUFn("sampling_frequency", decodeEscapeValueAbsFn(4, 24, 0), frequencyIndexHzMap)
|
|
d.FieldU4("channel_configuration", channelConfigurationNames)
|
|
// TODO: GASpecificConfig etc
|
|
d.FieldRawLen("var_aot_or_byte_align", d.BitsLeft())
|
|
|
|
return format.MPEGASCOut{ObjectType: int(objectType)}
|
|
}
|