michael@0: /* Copyright (c) 2011 Xiph.Org Foundation
michael@0:    Written by Jean-Marc Valin */
michael@0: /*
michael@0:    Redistribution and use in source and binary forms, with or without
michael@0:    modification, are permitted provided that the following conditions
michael@0:    are met:
michael@0: 
michael@0:    - Redistributions of source code must retain the above copyright
michael@0:    notice, this list of conditions and the following disclaimer.
michael@0: 
michael@0:    - Redistributions in binary form must reproduce the above copyright
michael@0:    notice, this list of conditions and the following disclaimer in the
michael@0:    documentation and/or other materials provided with the distribution.
michael@0: 
michael@0:    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
michael@0:    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
michael@0:    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
michael@0:    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
michael@0:    OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
michael@0:    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
michael@0:    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
michael@0:    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
michael@0:    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
michael@0:    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
michael@0:    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
michael@0: */
michael@0: 
michael@0: #ifdef HAVE_CONFIG_H
michael@0: #include "config.h"
michael@0: #endif
michael@0: 
michael@0: #include "opus_multistream.h"
michael@0: #include "opus.h"
michael@0: #include "opus_private.h"
michael@0: #include "stack_alloc.h"
michael@0: #include <stdarg.h>
michael@0: #include "float_cast.h"
michael@0: #include "os_support.h"
michael@0: 
michael@0: 
michael@0: int validate_layout(const ChannelLayout *layout)
michael@0: {
michael@0:    int i, max_channel;
michael@0: 
michael@0:    max_channel = layout->nb_streams+layout->nb_coupled_streams;
michael@0:    if (max_channel>255)
michael@0:       return 0;
michael@0:    for (i=0;i<layout->nb_channels;i++)
michael@0:    {
michael@0:       if (layout->mapping[i] >= max_channel && layout->mapping[i] != 255)
michael@0:          return 0;
michael@0:    }
michael@0:    return 1;
michael@0: }
michael@0: 
michael@0: 
michael@0: int get_left_channel(const ChannelLayout *layout, int stream_id, int prev)
michael@0: {
michael@0:    int i;
michael@0:    i = (prev<0) ? 0 : prev+1;
michael@0:    for (;i<layout->nb_channels;i++)
michael@0:    {
michael@0:       if (layout->mapping[i]==stream_id*2)
michael@0:          return i;
michael@0:    }
michael@0:    return -1;
michael@0: }
michael@0: 
michael@0: int get_right_channel(const ChannelLayout *layout, int stream_id, int prev)
michael@0: {
michael@0:    int i;
michael@0:    i = (prev<0) ? 0 : prev+1;
michael@0:    for (;i<layout->nb_channels;i++)
michael@0:    {
michael@0:       if (layout->mapping[i]==stream_id*2+1)
michael@0:          return i;
michael@0:    }
michael@0:    return -1;
michael@0: }
michael@0: 
michael@0: int get_mono_channel(const ChannelLayout *layout, int stream_id, int prev)
michael@0: {
michael@0:    int i;
michael@0:    i = (prev<0) ? 0 : prev+1;
michael@0:    for (;i<layout->nb_channels;i++)
michael@0:    {
michael@0:       if (layout->mapping[i]==stream_id+layout->nb_coupled_streams)
michael@0:          return i;
michael@0:    }
michael@0:    return -1;
michael@0: }
michael@0: