116 lines
3.0 KiB
C#
116 lines
3.0 KiB
C#
using GLib;
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using Gst;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace GstreamerSharp
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{
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class Program
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{
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static void Main(string[] args)
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{
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Gst.Application.Init(ref args);
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Element src = ElementFactory.Make("audiotestsrc");
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Element convert = ElementFactory.Make("audioconvert");
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Element volume = new ExampleVolume();
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Element sink = ElementFactory.Make("autoaudiosink");
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Pipeline pipeline = new Pipeline();
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pipeline.Add(src, convert, volume, sink);
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Element.Link(src, convert, volume, sink);
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pipeline.SetState(State.Playing);
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MainLoop loop = new MainLoop();
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loop.Run();
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pipeline.SetState(State.Null);
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Console.ReadLine();
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}
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}
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class ExampleVolume : Element
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{
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public ExampleVolume()
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{
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Volume = 0.5;
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_sink = new Pad(__sinkTemplate, "sink");
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_sink.ChainFunctionFull = Chain;
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_sink.Flags |= PadFlags.ProxyCaps;
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AddPad(_sink);
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_src = new Pad(__srcTemplate, "src");
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_src.Flags |= PadFlags.ProxyCaps;
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AddPad(_src);
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}
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public double Volume { get; set; }
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FlowReturn Chain(Pad pad, Gst.Object parent, Gst.Buffer buffer)
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{
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if (Volume == 1.0)
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{
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return _src.Push(buffer);
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}
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buffer.MakeWritable();
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MapInfo mapInfo;
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buffer.Map(out mapInfo, MapFlags.Read | MapFlags.Write);
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ScaleInt16(mapInfo.DataPtr, mapInfo.Size / 2, Volume);
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buffer.Unmap(mapInfo);
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return _src.Push(buffer);
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}
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private unsafe void ScaleInt16(IntPtr data, ulong size, double volume)
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{
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Int16* sample = (Int16*)data;
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for (ulong i = 0; i < size; i++)
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{
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*sample = ClampInt16(*sample * volume);
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sample++;
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}
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}
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private Int16 ClampInt16(double d)
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{
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int i = (int)Math.Round(d);
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if (i > Int16.MaxValue)
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{
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return Int16.MaxValue;
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}
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else if (i < Int16.MinValue)
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{
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return Int16.MinValue;
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}
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else
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{
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return (Int16)i;
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}
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}
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Pad _src;
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Pad _sink;
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static ExampleVolume()
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{
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Caps audioCaps = Caps.FromString("audio/x-raw, format=(string) S16LE, rate=(int) [1, MAX], channels=(int) 2, layout=(string) interleaved");
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__srcTemplate = new PadTemplate("src", PadDirection.Src, PadPresence.Always, audioCaps);
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__sinkTemplate = new PadTemplate("sink", PadDirection.Sink, PadPresence.Always, audioCaps);
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}
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static PadTemplate __srcTemplate;
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static PadTemplate __sinkTemplate;
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}
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}
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