/
stream.go
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/
stream.go
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// {{{ Copyright (c) Paul R. Tagliamonte <paul@k3xec.com>, 2021
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE. }}}
package packer
import (
"fmt"
"hz.tools/sdr"
"hz.tools/sdr/stream"
)
// CompressReader will read an int16 stream of packed 12 bit ints and
// unpack them into real IQ data.
func CompressReader(in sdr.Reader) (sdr.Reader, error) {
if in.SampleFormat() != sdr.SampleFormatI16 {
return nil, fmt.Errorf("compress: only i16 supported")
}
return stream.ReadTransformer(in, stream.ReadTransformerConfig{
InputBufferLength: 32 * 1024,
OutputBufferLength: ((32 * 1024) / 4) * 3,
OutputSampleRate: in.SampleRate(),
OutputSampleFormat: in.SampleFormat(),
Proc: func(in, out sdr.Samples) (int, error) {
return CompressI16(in.(sdr.SamplesI16), out.(sdr.SamplesI16))
},
})
}
// CompressWriter will write out int16 (really int12) values packed into
// int16 values.
func CompressWriter(out sdr.Writer) (sdr.Writer, error) {
if out.SampleFormat() != sdr.SampleFormatI16 {
return nil, fmt.Errorf("compress: only i16 supported")
}
pipeReader, pipeWriter := sdr.Pipe(out.SampleRate(), out.SampleFormat())
cr, err := CompressReader(pipeReader)
if err != nil {
return nil, err
}
inb := make(sdr.SamplesI16, 32*1024)
go func() {
for {
n, err := sdr.ReadFull(cr, inb)
if err != nil {
pipeReader.CloseWithError(err)
return
}
_, err = out.Write(inb[:n])
if err != nil {
pipeReader.CloseWithError(err)
return
}
}
}()
return pipeWriter, nil
}
// DecompressReader will unpack 12bit values into i16 values.
func DecompressReader(in sdr.Reader) (sdr.Reader, error) {
if in.SampleFormat() != sdr.SampleFormatI16 {
return nil, fmt.Errorf("compress: only i16 supported")
}
return stream.ReadTransformer(in, stream.ReadTransformerConfig{
InputBufferLength: ((32 * 1024) / 4) * 3,
OutputBufferLength: 32 * 1024,
OutputSampleRate: in.SampleRate(),
OutputSampleFormat: in.SampleFormat(),
Proc: func(in, out sdr.Samples) (int, error) {
return DecompressI16(in.(sdr.SamplesI16), out.(sdr.SamplesI16))
},
})
}
// vim: foldmethod=marker