Create & Init Project...

Dockerfile

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+FROM golang:alpine AS build
+
+WORKDIR /go/src/github.com/yumc.pw/cloud/ffmpeg-webapi
+ADD main.go .
+RUN go build -o main
+
+FROM alpine:edge
+LABEL maintainer="MiaoWoo<admin@yumc.pw>"
+
+WORKDIR /root
+
+RUN set -x && \
+  apk add --no-cache ca-certificates yasm ffmpeg && \
+  rm -rf /var/cache/apk/*
+
+COPY --from=build /go/src/github.com/yumc.pw/cloud/ffmpeg-webapi/main ./main
+
+CMD ./main

go.mod

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+module yumc.pw/cloud/ffmpeg-webapi

main.go

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+package main
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"os/exec"
+	"strconv"
+	"strings"
+)
+
+var tempDir *string
+var ffmpeg = "ffmpeg"
+
+func main() {
+	b := flag.String("b", ":8080", "Server Bind Address")
+	tempDir = flag.String("temp", os.TempDir(), "")
+	flag.Parse()
+
+	if _, err := exec.LookPath(ffmpeg); err != nil {
+		fmt.Printf("Error Can't Find %s Client...", ffmpeg)
+		return
+	}
+
+	http.HandleFunc("/", func(resp http.ResponseWriter, req *http.Request) {
+		if strings.HasPrefix(req.RequestURI, "/amr2mp3") {
+			amr2mp3(resp, req)
+			return
+		}
+		api(resp, req)
+	})
+
+	http.ListenAndServe(*b, nil)
+	fmt.Printf("FFmpeg WebInterface Listen on %s ...\n", *b)
+}
+
+func api(w http.ResponseWriter, r *http.Request) {
+	handleInternal(w, r, r.FormValue("o"), r.FormValue("t"))
+}
+
+func amr2mp3(w http.ResponseWriter, r *http.Request) {
+	handleInternal(w, r, "amr", "mp3")
+}
+
+func handleInternal(w http.ResponseWriter, r *http.Request, origin, target string) {
+	// Read Byte From File Or URL
+	bytes, err := readBytesFromRequest(r)
+	if err != nil {
+		w.Write([]byte("Error Read Bytes: " + err.Error()))
+		return
+	}
+	// Convert origin to target
+	out, err := convert(bytes, origin, target)
+	if err != nil {
+		w.Write([]byte("Error Handler: " + err.Error()))
+		return
+	}
+	w.Write(out)
+}
+
+func convert(in []byte, origin, target string) (out []byte, err error) {
+	source := *tempDir + "/" + fmt.Sprintf("ffmpeg-webapi-%s-%s", MD5(in), strconv.Itoa(len(in)))
+
+	amr := source + "." + origin
+	ioutil.WriteFile(amr, in, os.ModeAppend)
+	defer os.Remove(amr)
+
+	mp3 := source + "." + target
+	err = exec.Command(ffmpeg, "-i", amr, mp3).Run()
+	defer os.Remove(mp3)
+
+	if err != nil {
+		// Ignore Error Bucause ffmpeg will return not zero when amr to mp3
+	}
+	// check target file is exist if not maybe exec error
+	if _, err := exec.LookPath(mp3); err == nil {
+		return nil, err
+	}
+
+	return ioutil.ReadFile(mp3)
+}
+
+func readBytesFromRequest(r *http.Request) (out []byte, err error) {
+	var reader io.Reader
+	url := r.FormValue("url")
+	if url != "" {
+		fmt.Printf("[A2M] url request " + url + "\n")
+		var resp *http.Response
+		resp, err = http.Get(url)
+		if err != nil {
+			return nil, err
+		}
+		reader = resp.Body
+	} else {
+		fmt.Printf("[A2M] file request\n")
+		reader, _, err = r.FormFile("file")
+		if err != nil {
+			return nil, err
+		}
+	}
+	return ioutil.ReadAll(reader)
+}
+
+// MD5 生成32位MD5
+func MD5(bytes []byte) string {
+	ctx := md5.New()
+	ctx.Write(bytes)
+	return hex.EncodeToString(ctx.Sum(nil))
+}