100 lines
3.5 KiB
C#
100 lines
3.5 KiB
C#
/* Copyright (c) 2007-2008 CSIRO
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Copyright (c) 2007-2011 Xiph.Org Foundation
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Originally written by Jean-Marc Valin, Gregory Maxwell, Koen Vos,
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Timothy B. Terriberry, and the Opus open-source contributors
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Ported to C# by Logan Stromberg
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using Concentus.Structs;
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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.Text;
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namespace Concentus
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{
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internal static class OpusMultistream
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{
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internal static int validate_layout(ChannelLayout layout)
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{
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int i, max_channel;
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max_channel = layout.nb_streams + layout.nb_coupled_streams;
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if (max_channel > 255)
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return 0;
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for (i = 0; i < layout.nb_channels; i++)
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{
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if (layout.mapping[i] >= max_channel && layout.mapping[i] != 255)
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return 0;
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}
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return 1;
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}
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internal static int get_left_channel(ChannelLayout layout, int stream_id, int prev)
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{
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int i;
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i = (prev < 0) ? 0 : prev + 1;
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for (; i < layout.nb_channels; i++)
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{
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if (layout.mapping[i] == stream_id * 2)
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return i;
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}
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return -1;
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}
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internal static int get_right_channel(ChannelLayout layout, int stream_id, int prev)
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{
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int i;
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i = (prev < 0) ? 0 : prev + 1;
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for (; i < layout.nb_channels; i++)
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{
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if (layout.mapping[i] == stream_id * 2 + 1)
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return i;
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}
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return -1;
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}
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internal static int get_mono_channel(ChannelLayout layout, int stream_id, int prev)
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{
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int i;
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i = (prev < 0) ? 0 : prev + 1;
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for (; i < layout.nb_channels; i++)
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{
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if (layout.mapping[i] == stream_id + layout.nb_coupled_streams)
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return i;
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}
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return -1;
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}
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}
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}
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