/
probe.go
155 lines (131 loc) · 4.08 KB
/
probe.go
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// Copyright © 2018 Wolfy-J <wolfy.jd@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package ffmpeg
import (
"bytes"
"encoding/json"
"os"
"os/exec"
"strconv"
)
// Media describes file information.
type Media struct {
// Format common file format information.
Format map[string]interface{} `json:"format"`
// Streams item information structure.
Streams []*Stream `json:"streams"`
// Duration is duration of storage file in seconds.
Duration float64
// Size of file in bytes.
Size uint64
}
// Strings packs info into json.
func (info *Media) String() string {
body, _ := json.MarshalIndent(info, "", " ")
return string(body)
}
// Stream information about single stream.
type Stream struct {
Index int `json:"index"`
Type string `json:"codec_type"`
CodecName string `json:"codec_name"`
CodecLongName string `json:"codec_long_name"`
Bitrate string `json:"bitRate"`
Duration float64 `json:"duration,string"`
Width int64 `json:"width"`
Height int64 `json:"height"`
Tags map[string]string `json:"tags,omitempty"`
}
// Strings packs info into json.
func (info *Stream) String() string {
body, _ := json.MarshalIndent(info, "", " ")
return string(body)
}
// Probe returns container and stream information from given file.
func Probe(filename string) (*Media, error) {
stat, err := os.Stat(filename)
if err != nil {
return nil, err
}
cmd := exec.Command(
"ffprobe",
"-v",
"quiet",
"-print_format",
"json",
"-show_format",
"-show_streams",
filename,
)
var cmdOut, cmdErr bytes.Buffer
cmd.Stdout, cmd.Stderr = &cmdOut, &cmdErr
if err := cmd.Run(); err != nil {
return nil, extractError(err, cmdErr.String())
}
info := &Media{}
if err := json.Unmarshal([]byte(cmdOut.String()), &info); err != nil {
return nil, err
}
// post processing
streams := make([]*Stream, 0)
for _, stream := range info.Streams {
if stream.Type == "video" {
if stream.Width == 0 || stream.Height == 0 {
continue
}
}
if info.Duration < stream.Duration {
info.Duration = stream.Duration
}
streams = append(streams, stream)
}
info.Streams = streams
// fallback duration using container information
if info.Duration == 0 {
if _, ok := info.Format["duration"]; ok {
if d, err := strconv.ParseFloat(info.Format["duration"].(string), 64); err != nil {
info.Duration = float64(d)
}
}
}
if size, ok := info.Format["size"]; ok {
if intSize, err := strconv.Atoi(size.(string)); err != nil {
info.Size = uint64(intSize)
} else {
info.Size = uint64(stat.Size())
}
}
for _, stream := range info.Streams {
if stream.Duration == 0 {
stream.Duration = info.Duration
}
if stream.Bitrate == "" {
stream.Bitrate = "0"
}
// flipping width and height
if angle, rotate := stream.Tags["rotate"]; rotate {
if angle == "90" || angle == "-90" {
// please do not rotate by more than 180
stream.Width, stream.Height = stream.Height, stream.Width
}
}
}
return info, nil
}