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92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
/* Copyright (c) 2011 Xiph.Org Foundation
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Written by Jean-Marc Valin */
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/*
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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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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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#ifdef OPUS_HAVE_CONFIG_H
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#include "opus_config.h"
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#endif
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#include "opus_multistream.h"
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#include "opus.h"
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#include "opus_private.h"
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#include "stack_alloc.h"
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#include <stdarg.h>
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#include "float_cast.h"
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#include "os_support.h"
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int validate_layout(const 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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int get_left_channel(const 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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int get_right_channel(const 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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int get_mono_channel(const 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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