/
mp3decode.go
367 lines (321 loc) · 11.5 KB
/
mp3decode.go
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package main
/*
#cgo pkg-config: gstreamer-1.0
#include <gst/gst.h>
// ******************** 定义消息处理函数 ********************
gboolean bus_call(GstBus *bus, GstMessage *msg, gpointer data)
{
GMainLoop *loop = (GMainLoop *)data;//这个是主循环的指针,在接受EOS消息时退出循环
gchar *debug;
GError *error;
switch (GST_MESSAGE_TYPE(msg)) {
case GST_MESSAGE_EOS:
g_main_loop_quit(loop);
break;
case GST_MESSAGE_ERROR:
gst_message_parse_error(msg,&error,&debug);
g_free(debug);
g_printerr("ERROR:%s\n",error->message);
g_error_free(error);
g_main_loop_quit(loop);
break;
default:
break;
}
return TRUE;
}
static GstBus *pipeline_get_bus(void *pipeline)
{
return gst_pipeline_get_bus(GST_PIPELINE(pipeline));
}
static void bus_add_watch(void *bus, void *loop)
{
gst_bus_add_watch(bus, bus_call, loop);
gst_object_unref(bus);
}
static void set_path(void *play, gchar *path)
{
g_object_set(G_OBJECT(play), "uri", path, NULL);
}
static void object_unref(void *pipeline)
{
gst_object_unref(GST_OBJECT(pipeline));
}
static void mp3_ready(void *pipeline)
{
gst_element_set_state(pipeline, GST_STATE_READY);
}
static void mp3_pause(void *pipeline)
{
gst_element_set_state(pipeline, GST_STATE_PAUSED);
}
static void mp3_play(void *pipeline)
{
gst_element_set_state(pipeline, GST_STATE_PLAYING);
}
static void mp3_stop(void *pipeline)
{
gst_element_set_state(pipeline, GST_STATE_NULL);
}
*/
import "C"
import (
"container/list"
"flag"
"fmt"
"math/rand"
"os"
"path/filepath"
"runtime/debug"
"sync"
"time"
"unsafe"
)
const MP3_FILE_MAX = 10
var g_list *list.List
var g_wg *sync.WaitGroup
var g_isOutOfOrder bool
func GString(s string) *C.gchar {
return (*C.gchar)(C.CString(s))
}
func GFree(s unsafe.Pointer) {
C.g_free(C.gpointer(s))
}
func walkFunc(fpath string, info os.FileInfo, err error) error {
if info.IsDir() {
return nil
}
switch filepath.Ext(fpath) {
case ".mp3":
case ".wav":
case ".ogg":
case ".wma":
default:
return nil
}
if x, err0 := filepath.Abs(fpath); err != nil {
err = err0
return err
} else {
p := fmt.Sprintf("file://%s", x)
g_list.PushBack(p)
}
return err
}
func outOfOrder(l *list.List) {
iTotal := 25
if iTotal > l.Len() {
iTotal = l.Len()
}
ll := make([]*list.List, iTotal)
for i := 0; i < iTotal; i++ {
ll[i] = list.New()
}
r := rand.New(rand.NewSource(time.Now().UnixNano()))
for e := l.Front(); e != nil; e = e.Next() {
fpath, ok := e.Value.(string)
if !ok {
panic("The path is invalid string")
}
if rand.Int()%2 == 0 {
ll[r.Intn(iTotal)].PushFront(fpath)
} else {
ll[r.Intn(iTotal)].PushBack(fpath)
}
}
r0 := rand.New(rand.NewSource(time.Now().UnixNano()))
l.Init()
for i := 0; i < iTotal; i++ {
if r0.Intn(2) == 0 {
l.PushBackList(ll[i])
} else {
l.PushFrontList(ll[i])
}
ll[i].Init()
}
}
func SinglePlayProcess(fpath string, loop *C.GMainLoop) {
// fmt.Printf("filename[%s]\n", fpath)
var pipeline *C.GstElement // 定义组件
var bus *C.GstBus
v0 := GString("playbin")
v1 := GString("play")
pipeline = C.gst_element_factory_make(v0, v1)
GFree(unsafe.Pointer(v0))
GFree(unsafe.Pointer(v1))
v2 := GString(fpath)
C.set_path(unsafe.Pointer(pipeline), v2)
GFree(unsafe.Pointer(v2))
// 得到 管道的消息总线
bus = C.pipeline_get_bus(unsafe.Pointer(pipeline))
if bus == (*C.GstBus)(nil) {
fmt.Println("GstBus element could not be created.Exiting.")
return
}
C.bus_add_watch(unsafe.Pointer(bus), unsafe.Pointer(loop))
C.mp3_ready(unsafe.Pointer(pipeline))
C.mp3_play(unsafe.Pointer(pipeline))
// 开始循环
C.g_main_loop_run(loop)
C.mp3_stop(unsafe.Pointer(pipeline))
C.object_unref(unsafe.Pointer(pipeline))
}
func PlayProcess(cs chan byte, loop *C.GMainLoop) {
wg := new(sync.WaitGroup)
sig_out := make(chan bool)
defer close(sig_out)
defer g_wg.Done()
if g_isOutOfOrder {
outOfOrder(g_list)
debug.FreeOSMemory()
}
start := g_list.Front()
end := g_list.Back()
e := g_list.Front()
for {
fpath, ok := e.Value.(string)
if ok {
// fmt.Printf("filename[%s]\n", fpath)
var pipeline *C.GstElement // 定义组件
var bus *C.GstBus
v0 := GString("playbin")
v1 := GString("play")
pipeline = C.gst_element_factory_make(v0, v1)
GFree(unsafe.Pointer(v0))
GFree(unsafe.Pointer(v1))
v2 := GString(fpath)
C.set_path(unsafe.Pointer(pipeline), v2)
GFree(unsafe.Pointer(v2))
// 得到 管道的消息总线
bus = C.pipeline_get_bus(unsafe.Pointer(pipeline))
if bus == (*C.GstBus)(nil) {
fmt.Println("GstBus element could not be created.Exiting.")
return
}
C.bus_add_watch(unsafe.Pointer(bus), unsafe.Pointer(loop))
C.mp3_ready(unsafe.Pointer(pipeline))
C.mp3_play(unsafe.Pointer(pipeline))
wg.Add(1)
go func(p *C.GstElement) {
defer wg.Done()
// 开始循环
C.g_main_loop_run(loop)
C.mp3_stop(unsafe.Pointer(p))
C.object_unref(unsafe.Pointer(p))
e = e.Next()
if e == nil {
sig_out <- true
} else {
sig_out <- false
}
}(pipeline)
lb := true
for lb {
select {
case op := <-cs:
switch op {
case 's':
C.mp3_pause(unsafe.Pointer(pipeline))
case 'r':
C.mp3_play(unsafe.Pointer(pipeline))
case 'n':
if e != end {
e = e.Next()
}
C.g_main_loop_quit(loop)
case 'p':
if e != start {
e = e.Prev()
}
C.g_main_loop_quit(loop)
case 'q':
C.g_main_loop_quit(loop)
<-sig_out
wg.Wait()
return
}
case c := <-sig_out:
if c {
wg.Wait()
return
} else {
lb = false
}
}
}
wg.Wait()
} else {
// 路径非法
return
}
}
}
func main() {
var loop *C.GMainLoop
var s0 byte
mdir := ""
mfile := ""
flag.StringVar(&mdir, "dir", "", "mp3文件目录")
flag.StringVar(&mfile, "file", "", "mp3文件")
flag.BoolVar(&g_isOutOfOrder, "rand", false, "是否乱序播放")
flag.Parse()
if mfile != "" {
p, err := filepath.Abs(mfile)
if err != nil {
fmt.Printf("Error: %v\n", err)
return
}
C.gst_init((*C.int)(unsafe.Pointer(nil)),
(***C.char)(unsafe.Pointer(nil)))
loop = C.g_main_loop_new((*C.GMainContext)(unsafe.Pointer(nil)),
C.gboolean(0)) // 创建主循环,在执行 g_main_loop_run后正式开始循环
mfile = fmt.Sprintf("file://%s", p)
SinglePlayProcess(mfile, loop)
return
}
if mdir == "" {
flag.PrintDefaults()
return
}
g_list = list.New()
g_wg = new(sync.WaitGroup)
C.gst_init((*C.int)(unsafe.Pointer(nil)),
(***C.char)(unsafe.Pointer(nil)))
loop = C.g_main_loop_new((*C.GMainContext)(unsafe.Pointer(nil)),
C.gboolean(0)) // 创建主循环,在执行 g_main_loop_run后正式开始循环
if err := filepath.Walk(mdir, walkFunc); err != nil {
fmt.Printf("Error: %v\n", err)
return
}
g_wg.Add(1)
s := make(chan byte)
defer close(s)
go PlayProcess(s, loop)
go func() {
LOOP0:
for {
fmt.Fscanf(os.Stdin, "%c\n", &s0)
switch s0 {
case 's':
s <- s0
case 'r':
s <- s0
case 'n':
s <- s0
case 'p':
s <- s0
case 'q':
s <- s0
break LOOP0
case 'h':
fmt.Print("'s' -> 暂停\n" +
"'r' -> 继续\n" +
"'n' -> 下一首\n" +
"'p' -> 上一首\n" +
"'q' -> 退出\n")
}
s0 = 0
}
}()
g_wg.Wait()
}