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      1 /* Copyright (c) 2011 Xiph.Org Foundation
      2    Written by Jean-Marc Valin */
      3 /*
      4    Redistribution and use in source and binary forms, with or without
      5    modification, are permitted provided that the following conditions
      6    are met:
      7 
      8    - Redistributions of source code must retain the above copyright
      9    notice, this list of conditions and the following disclaimer.
     10 
     11    - Redistributions in binary form must reproduce the above copyright
     12    notice, this list of conditions and the following disclaimer in the
     13    documentation and/or other materials provided with the distribution.
     14 
     15    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     18    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
     19    OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     20    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     22    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     23    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     24    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     25    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26 */
     27 
     28 #ifdef HAVE_CONFIG_H
     29 #include "config.h"
     30 #endif
     31 
     32 #include "opus_multistream.h"
     33 #include "opus.h"
     34 #include "opus_private.h"
     35 #include "stack_alloc.h"
     36 #include <stdarg.h>
     37 #include "float_cast.h"
     38 #include "os_support.h"
     39 
     40 
     41 int validate_layout(const ChannelLayout *layout)
     42 {
     43    int i, max_channel;
     44 
     45    max_channel = layout->nb_streams+layout->nb_coupled_streams;
     46    if (max_channel>255)
     47       return 0;
     48    for (i=0;i<layout->nb_channels;i++)
     49    {
     50       if (layout->mapping[i] >= max_channel && layout->mapping[i] != 255)
     51          return 0;
     52    }
     53    return 1;
     54 }
     55 
     56 
     57 int get_left_channel(const ChannelLayout *layout, int stream_id, int prev)
     58 {
     59    int i;
     60    i = (prev<0) ? 0 : prev+1;
     61    for (;i<layout->nb_channels;i++)
     62    {
     63       if (layout->mapping[i]==stream_id*2)
     64          return i;
     65    }
     66    return -1;
     67 }
     68 
     69 int get_right_channel(const ChannelLayout *layout, int stream_id, int prev)
     70 {
     71    int i;
     72    i = (prev<0) ? 0 : prev+1;
     73    for (;i<layout->nb_channels;i++)
     74    {
     75       if (layout->mapping[i]==stream_id*2+1)
     76          return i;
     77    }
     78    return -1;
     79 }
     80 
     81 int get_mono_channel(const ChannelLayout *layout, int stream_id, int prev)
     82 {
     83    int i;
     84    i = (prev<0) ? 0 : prev+1;
     85    for (;i<layout->nb_channels;i++)
     86    {
     87       if (layout->mapping[i]==stream_id+layout->nb_coupled_streams)
     88          return i;
     89    }
     90    return -1;
     91 }
     92 
     93