编辑 Updated code with solution
我需要将amr转码为mp3,所以我在gstreamer-java中写了一个gstreamer管道。它看起来像这样:
src ! amrparse ! amrnbdec ! lamemp3enc ! sink
(实际上是用java API构建的),我用
开始转码Bus.connect(EOS, fn(){Gst.quit();});
setState(PLAYING);
Gst.main();
它工作正常,除了所需的时间等于音频长度,这是不可接受的。 等价
gst-launch
以机器速度转码。
那么我如何设置管道,以获得机器速度转码?
以下是适合流利的人士的完整资源
(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)))
答案 0 :(得分:6)
尝试.setSync(false)
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。也许您的输出流正在尝试实时工作。