106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
package artwork
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import (
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"bufio"
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"bytes"
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"context"
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"fmt"
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"image"
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"image/jpeg"
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"image/png"
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"io"
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"net/http"
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"time"
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"github.com/disintegration/imaging"
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"github.com/navidrome/navidrome/conf"
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"github.com/navidrome/navidrome/log"
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"github.com/navidrome/navidrome/model"
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"github.com/navidrome/navidrome/utils/number"
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)
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type resizedArtworkReader struct {
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cacheKey
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a *artwork
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}
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func resizedFromOriginal(ctx context.Context, a *artwork, artID model.ArtworkID, size int) (*resizedArtworkReader, error) {
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r := &resizedArtworkReader{a: a}
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r.cacheKey.artID = artID
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r.cacheKey.size = size
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// Get lastUpdated from original artwork
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original, err := a.getArtworkReader(ctx, artID, 0)
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if err != nil {
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return nil, err
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}
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r.cacheKey.lastUpdate = original.LastUpdated()
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return r, nil
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}
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func (a *resizedArtworkReader) LastUpdated() time.Time {
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return a.lastUpdate
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}
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func (a *resizedArtworkReader) Reader(ctx context.Context) (io.ReadCloser, string, error) {
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// Get artwork in original size, possibly from cache
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orig, _, err := a.a.Get(ctx, a.artID.String(), 0)
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if err != nil {
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return nil, "", err
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}
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// Keep a copy of the original data. In case we can't resize it, send it as is
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buf := new(bytes.Buffer)
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r := io.TeeReader(orig, buf)
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defer orig.Close()
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resized, origSize, err := resizeImage(r, a.size)
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log.Trace(ctx, "Resizing artwork", "artID", a.artID, "original", origSize, "resized", a.size)
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if err != nil {
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log.Warn(ctx, "Could not resize image. Will return image as is", "artID", a.artID, "size", a.size, err)
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// Force finish reading any remaining data
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_, _ = io.Copy(io.Discard, r)
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return io.NopCloser(buf), "", nil
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}
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return io.NopCloser(resized), fmt.Sprintf("%s@%d", a.artID, a.size), nil
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}
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func asImageReader(r io.Reader) (io.Reader, string, error) {
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br := bufio.NewReader(r)
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buf, err := br.Peek(512)
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if err != nil {
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return nil, "", err
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}
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return br, http.DetectContentType(buf), nil
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}
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func resizeImage(reader io.Reader, size int) (io.Reader, int, error) {
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r, format, err := asImageReader(reader)
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if err != nil {
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return nil, 0, err
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}
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img, _, err := image.Decode(r)
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if err != nil {
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return nil, 0, err
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}
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// Preserve the aspect ratio of the image.
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var m *image.NRGBA
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bounds := img.Bounds()
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if bounds.Max.X > bounds.Max.Y {
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m = imaging.Resize(img, size, 0, imaging.Lanczos)
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} else {
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m = imaging.Resize(img, 0, size, imaging.Lanczos)
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}
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buf := new(bytes.Buffer)
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buf.Reset()
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if format == "image/png" {
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err = png.Encode(buf, m)
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} else {
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err = jpeg.Encode(buf, m, &jpeg.Options{Quality: conf.Server.CoverJpegQuality})
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}
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return buf, number.Max(bounds.Max.X, bounds.Max.Y), err
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}
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