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audio/wav: Add DecodeWithSampleRate

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Closes #1460
This commit is contained in:
Hajime Hoshi 2021-01-06 23:09:09 +09:00
parent b78dde0e37
commit 9849cb5c2b
1 changed files with 25 additions and 8 deletions
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33
audio/wav/decode.go
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@ -93,18 +93,18 @@ func (s *stream) Seek(offset int64, whence int) (int64, error) {
return n - s.headerSize, nil return n - s.headerSize, nil
} }
// Decode decodes WAV (RIFF) data to playable stream. // DecodeWithSampleRate decodes WAV (RIFF) data to playable stream.
// //
// The format must be 1 or 2 channels, 8bit or 16bit little endian PCM. // The format must be 1 or 2 channels, 8bit or 16bit little endian PCM.
// The format is converted into 2 channels and 16bit. // The format is converted into 2 channels and 16bit.
// //
// Decode returns error when decoding fails or IO error happens. // DecodeWithSampleRate returns error when decoding fails or IO error happens.
// //
// Decode automatically resamples the stream to fit with the audio context if necessary. // DecodeWithSampleRate automatically resamples the stream to fit with sampleRate if necessary.
// //
// A Stream doesn't close src even if src implements io.Closer. // A Stream doesn't close src even if src implements io.Closer.
// Closing the source is src owner's responsibility. // Closing the source is src owner's responsibility.
func Decode(context *audio.Context, src io.ReadSeeker) (*Stream, error) { func DecodeWithSampleRate(sampleRate int, src io.ReadSeeker) (*Stream, error) {
buf := make([]byte, 12) buf := make([]byte, 12)
n, err := io.ReadFull(src, buf) n, err := io.ReadFull(src, buf)
if n != len(buf) { if n != len(buf) {
@ -170,10 +170,10 @@ chunks:
if bitsPerSample != 8 && bitsPerSample != 16 { if bitsPerSample != 8 && bitsPerSample != 16 {
return nil, fmt.Errorf("wav: bits per sample must be 8 or 16 but was %d", bitsPerSample) return nil, fmt.Errorf("wav: bits per sample must be 8 or 16 but was %d", bitsPerSample)
} }
sampleRate := int64(buf[4]) | int64(buf[5])<<8 | int64(buf[6])<<16 | int64(buf[7])<<24 origSampleRate := int64(buf[4]) | int64(buf[5])<<8 | int64(buf[6])<<16 | int64(buf[7])<<24
if int64(context.SampleRate()) != sampleRate { if int64(sampleRate) != origSampleRate {
sampleRateFrom = int(sampleRate) sampleRateFrom = int(origSampleRate)
sampleRateTo = context.SampleRate() sampleRateTo = sampleRate
} }
headerSize += size headerSize += size
case bytes.Equal(buf[0:4], []byte("data")): case bytes.Equal(buf[0:4], []byte("data")):
@ -215,3 +215,20 @@ chunks:
ss := &Stream{inner: s, size: dataSize} ss := &Stream{inner: s, size: dataSize}
return ss, nil return ss, nil
} }
// Decode decodes WAV (RIFF) data to playable stream.
//
// The format must be 1 or 2 channels, 8bit or 16bit little endian PCM.
// The format is converted into 2 channels and 16bit.
//
// Decode returns error when decoding fails or IO error happens.
//
// Decode automatically resamples the stream to fit with the audio context if necessary.
//
// A Stream doesn't close src even if src implements io.Closer.
// Closing the source is src owner's responsibility.
//
// Deprecated: as of v2.1. Use DecodeWithSampleRate instead.
func Decode(context *audio.Context, src io.ReadSeeker) (*Stream, error) {
return DecodeWithSampleRate(context.SampleRate(), src)
}