Stu Leak
68df790d27
Major improvements to UnifiedPlayer: 1. GetFrameImage() now works when paused for responsive UI updates 2. Play() method properly starts FFmpeg process 3. Frame display loop runs continuously for smooth video display 4. Disabled audio temporarily to fix video playback fundamentals 5. Simplified FFmpeg command to focus on video stream only Player now: - Generates video frames correctly - Shows video when paused - Has responsive progress tracking - Starts playback properly Next steps: Re-enable audio playback once video is stable
70 lines
1.4 KiB
Go
70 lines
1.4 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tiff
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import "io"
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// buffer buffers an io.Reader to satisfy io.ReaderAt.
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type buffer struct {
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r io.Reader
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buf []byte
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}
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// fill reads data from b.r until the buffer contains at least end bytes.
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func (b *buffer) fill(end int) error {
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m := len(b.buf)
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if end > m {
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if end > cap(b.buf) {
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newcap := 1024
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for newcap < end {
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newcap *= 2
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}
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newbuf := make([]byte, end, newcap)
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copy(newbuf, b.buf)
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b.buf = newbuf
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} else {
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b.buf = b.buf[:end]
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}
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if n, err := io.ReadFull(b.r, b.buf[m:end]); err != nil {
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end = m + n
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b.buf = b.buf[:end]
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return err
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}
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}
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return nil
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}
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func (b *buffer) ReadAt(p []byte, off int64) (int, error) {
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o := int(off)
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end := o + len(p)
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if int64(end) != off+int64(len(p)) {
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return 0, io.ErrUnexpectedEOF
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}
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err := b.fill(end)
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return copy(p, b.buf[o:end]), err
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}
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// Slice returns a slice of the underlying buffer. The slice contains
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// n bytes starting at offset off.
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func (b *buffer) Slice(off, n int) ([]byte, error) {
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end := off + n
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if err := b.fill(end); err != nil {
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return nil, err
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}
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return b.buf[off:end], nil
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}
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// newReaderAt converts an io.Reader into an io.ReaderAt.
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func newReaderAt(r io.Reader) io.ReaderAt {
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if ra, ok := r.(io.ReaderAt); ok {
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return ra
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}
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return &buffer{
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r: r,
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buf: make([]byte, 0, 1024),
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}
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}
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