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7c5215347d
Remove bitio.Buffer layer. bitio.Buffer was a kitchen sink layer with helpers now it's just a buffer and most functions have been moved to decode instead. bitio package now only have primitive types and functions simialar to standard library io and bytes packages. Make nearly eveything internally use bitio.Bit* interfaces so that slicing work correctly this will also make it possible to start experimenting with more complicated silcing helpers, ex things like: breplace(.header.bitrate; 123) to get a new buffer with bitrate changed.
41 lines
1.3 KiB
Go
41 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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md5BR := d.FieldRawLen("md5", 16*8, scalar.RawHex)
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md5b := d.MustReadAllBits(md5BR)
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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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