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2fc0a71a47
Move scalar into own package. Split scalar code into decode related scalar code (that reads etc) and scalar code that just transform the scalar value. Use a scalar.Mapper interface instead of just a function. Make mappers, assert and validat impement the interface.
44 lines
1.3 KiB
Go
44 lines
1.3 KiB
Go
package flac
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import (
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"github.com/wader/fq/format"
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"github.com/wader/fq/format/registry"
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"github.com/wader/fq/pkg/decode"
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"github.com/wader/fq/pkg/scalar"
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)
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func init() {
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registry.MustRegister(decode.Format{
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Name: format.FLAC_STREAMINFO,
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Description: "FLAC streaminfo",
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DecodeFn: streaminfoDecode,
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})
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}
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func streaminfoDecode(d *decode.D, in interface{}) interface{} {
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d.FieldU16("minimum_block_size")
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d.FieldU16("maximum_block_size")
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d.FieldU24("minimum_frame_size")
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d.FieldU24("maximum_frame_size")
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sampleRate := d.FieldU("sample_rate", 20)
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// <3> (number of channels)-1. FLAC supports from 1 to 8 channels
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d.FieldU3("channels", scalar.UAdd(1))
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// <5> (bits per sample)-1. FLAC supports from 4 to 32 bits per sample. Currently the reference encoder and decoders only support up to 24 bits per sample.
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bitPerSample := d.FieldU5("bits_per_sample", scalar.UAdd(1))
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totalSamplesInStream := d.FieldU("total_samples_in_stream", 36)
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md5BB := d.FieldRawLen("md5", 16*8, scalar.RawHex)
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md5b, err := md5BB.Bytes()
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if err != nil {
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d.IOPanic(err, "md5BB.Bytes")
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}
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return format.FlacStreaminfoOut{
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StreamInfo: format.FlacStreamInfo{
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SampleRate: sampleRate,
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BitPerSample: bitPerSample,
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TotalSamplesInStream: totalSamplesInStream,
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MD5: md5b,
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},
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}
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}
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