mirror of
https://github.com/wader/fq.git
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f4480c6fe5
interp: Refactor format help and also include options
interp: Add -o name=@path to load file content as value (not documented yet, might change)
interp,decode: Expose decode out value as _out (might change)
interp: Refactor foramts.jq into format_{decode,func,include}.jq
interp: Refactor torepr into _format_func for generic format function overloading
interp: Refactor -o options parsing to be more generic and collect unknowns options to be used as format options
decode of decode alises
func for format overloaded functions
include for format specific jq functions (also _help, torepr etc)
flac_frame: Add bits_per_sample option
mp3: Add max_unique_header_config and max_sync_seek options
mp4: Add decode_samples and allow_truncate options
avc_au: Has length_size option
hevc_au: Has length_size option
aac_frame: Has object_typee option
doc: Rewrite format doc generation, less hack more jq
89 lines
2.7 KiB
Go
89 lines
2.7 KiB
Go
package flac
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// https://xiph.org/flac/format.html
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// https://wiki.hydrogenaud.io/index.php?title=FLAC_decoder_testbench
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// TODO:
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// 16 - Part 6 of Ladybug Castle (partition order 8 with escape codes)
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// 32 - Part 5 of The Four of Us Are Dying (partition order 8 with escape codes)
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import (
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"bytes"
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"crypto/md5"
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"fmt"
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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/internal/mathextra"
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"github.com/wader/fq/pkg/bitio"
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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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var flacMetadatablocksFormat decode.Group
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var flacFrameFormat decode.Group
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func init() {
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registry.MustRegister(decode.Format{
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Name: format.FLAC,
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Description: "Free Lossless Audio Codec file",
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Groups: []string{format.PROBE},
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DecodeFn: flacDecode,
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Dependencies: []decode.Dependency{
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{Names: []string{format.FLAC_METADATABLOCKS}, Group: &flacMetadatablocksFormat},
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{Names: []string{format.FLAC_FRAME}, Group: &flacFrameFormat},
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},
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})
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}
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func flacDecode(d *decode.D, in interface{}) interface{} {
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d.FieldUTF8("magic", 4, d.AssertStr("fLaC"))
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var streamInfo format.FlacStreamInfo
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var flacFrameIn format.FlacFrameIn
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var framesNDecodedSamples uint64
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var streamTotalSamples uint64
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var streamDecodedSamples uint64
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_, v := d.FieldFormat("metadatablocks", flacMetadatablocksFormat, nil)
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flacMetadatablockOut, ok := v.(format.FlacMetadatablocksOut)
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if !ok {
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panic(fmt.Sprintf("expected FlacMetadatablockOut got %#+v", v))
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}
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if flacMetadatablockOut.HasStreamInfo {
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streamInfo = flacMetadatablockOut.StreamInfo
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streamTotalSamples = streamInfo.TotalSamplesInStream
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flacFrameIn = format.FlacFrameIn{BitsPerSample: int(streamInfo.BitsPerSample)}
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}
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md5Samples := md5.New()
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d.FieldArray("frames", func(d *decode.D) {
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for d.NotEnd() {
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// flac frame might need some fields from stream info to decode
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_, v := d.FieldFormat("frame", flacFrameFormat, flacFrameIn)
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ffo, ok := v.(format.FlacFrameOut)
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if !ok {
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panic(fmt.Sprintf("expected FlacFrameOut got %#+v", v))
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}
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samplesInFrame := ffo.Samples
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if streamTotalSamples > 0 {
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samplesInFrame = mathextra.MinUInt64(streamTotalSamples-streamDecodedSamples, ffo.Samples)
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}
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frameStreamSamplesBuf := ffo.SamplesBuf[0 : samplesInFrame*uint64(ffo.Channels*ffo.BitsPerSample/8)]
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framesNDecodedSamples += ffo.Samples
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d.MustCopy(md5Samples, bytes.NewReader(frameStreamSamplesBuf))
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streamDecodedSamples += ffo.Samples
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// reuse buffer if possible
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flacFrameIn.SamplesBuf = ffo.SamplesBuf
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}
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})
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md5CalcValue := d.FieldRootBitBuf("md5_calculated", bitio.NewBitReader(md5Samples.Sum(nil), -1))
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_ = md5CalcValue.TryScalarFn(d.ValidateBitBuf(streamInfo.MD5), scalar.RawHex)
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d.FieldValueU("decoded_samples", framesNDecodedSamples)
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return nil
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}
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