编辑 Updated code with solution
我需要将amr转码为mp3,因此我在gstreamer-java中编写了gstreamer管道。看起来像这样:
src ! amrparse ! amrnbdec ! lamemp3enc ! sink
(当然,实际上是使用Java API构建的),我使用
Bus.connect(EOS, fn(){Gst.quit();});
setState(PLAYING);
Gst.main();
它可以正常工作,只是所花费的时间等于音频长度,这是不可接受的。
等效
gst-launch
以机器速度进行转码。
那么,我该如何设置管道以进行机器速度转码?
这是完整的资料,适用于精通clojure的人
(ns audio
(:import [org.gstreamer Gst Pipeline Bin Element ElementFactory State
StateChangeReturn Bus$EOS Bus$ERROR Bus$STATE_CHANGED]
[org.gstreamer.io InputStreamSrc OutputStreamSink]
[java.io InputStream OutputStream])
(:use clojure.contrib.logging))
(Gst/init)
(defn transcode [^InputStream in ^OutputStream out]
(let [id (gensym (quote transcode))
src (InputStreamSrc. in (str "in stream " id))
dec0 (ElementFactory/make "amrparse" (str "amr parser " id))
dec1 (ElementFactory/make "amrnbdec" (str "amr decoder " id))
enc (doto (ElementFactory/make "lamemp3enc" (str "mp3 encoder " id))
(.set "mono" true)
(.set "target" 0)
(.set "quality" 2))
out (doto (OutputStreamSink. out (str "out stream " id))
(.setSync false))
pipe (doto (Pipeline. (str "transcoder pipe " id))
(.add src)
(.add dec0)
(.add dec1)
(.add enc)
(.add out))
clean (fn []
(.setState src nil)
(.setState dec0 nil)
(.setState dec1 nil)
(.setState enc nil)
(.setState out nil)
(.setState pipe nil))]
(prn "starting transcode " id)
(.link src dec0)
(.link dec0 dec1)
(.link dec1 enc)
(.link enc out)
(doto (.getBus pipe)
(.connect
(reify Bus$EOS
(endOfStream [this src]
(prn "Bus finished " src)
(clean)
(Gst/quit))))
(.connect
(reify Bus$ERROR
(errorMessage [this src code msg]
(prn "Bus Error " src code msg)
(clean)
(Gst/quit))))
(.connect
(reify Bus$STATE_CHANGED
(stateChanged [this src old now pending]
(prn "Bus State change " src old now pending)))))
(.setState pipe State/PLAYING)
(Gst/main)))
最佳答案
尝试使用.setSync(false)
作为输出。在普通的gstreamer中,同步流试图跟踪时间,而异步流则尽可能快地运行。也许您的输出流正在尝试实时工作。
关于java - gstreamer快速转码,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/3903379/