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Stephen McQuay 2016-12-10 15:28:23 -08:00
commit 30fae5b7ee
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license Normal file
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Copyright (c) 2016, stephen mcquay
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of smcquay nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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mov.go Normal file
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package mov
import (
"bytes"
"encoding/binary"
"errors"
"os"
"time"
)
const epochAdjust = 2082844800
// Created attempts to find a created time from the metadata in a .mov file.
func Created(path string) (time.Time, error) {
var r time.Time
f, err := os.Open(path)
if err != nil {
return r, err
}
defer f.Close()
buf := [8]byte{}
for {
_, err := f.Read(buf[:])
if err != nil {
return r, err
}
if bytes.Equal(buf[4:8], []byte("moov")) {
break
} else {
atomSize := binary.BigEndian.Uint32(buf[:])
f.Seek(int64(atomSize)-8, 1)
}
}
_, err = f.Read(buf[:])
if err != nil {
return r, err
}
s := string(buf[4:8])
switch s {
case "mvhd":
if _, err := f.Seek(4, 1); err != nil {
return r, err
}
_, err = f.Read(buf[:4])
if err != nil {
return r, err
}
i := int64(binary.BigEndian.Uint32(buf[:4]))
c := i - epochAdjust
u := time.Unix(c, 0).Local()
return u, nil
case "cmov":
return r, errors.New("moov atom is compressed")
default:
return r, errors.New("expected to find 'mvhd' header, didn't")
}
}

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readme.md Normal file
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packge mov
simple package to parse out creation time from a .mov file