Line data    Source code

       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           0 : int validate_layout(const ChannelLayout *layout)
      42             : {
      43             :    int i, max_channel;
      44             : 
      45           0 :    max_channel = layout->nb_streams+layout->nb_coupled_streams;
      46           0 :    if (max_channel>255)
      47           0 :       return 0;
      48           0 :    for (i=0;i<layout->nb_channels;i++)
      49             :    {
      50           0 :       if (layout->mapping[i] >= max_channel && layout->mapping[i] != 255)
      51           0 :          return 0;
      52             :    }
      53           0 :    return 1;
      54             : }
      55             : 
      56             : 
      57           0 : int get_left_channel(const ChannelLayout *layout, int stream_id, int prev)
      58             : {
      59             :    int i;
      60           0 :    i = (prev<0) ? 0 : prev+1;
      61           0 :    for (;i<layout->nb_channels;i++)
      62             :    {
      63           0 :       if (layout->mapping[i]==stream_id*2)
      64           0 :          return i;
      65             :    }
      66           0 :    return -1;
      67             : }
      68             : 
      69           0 : int get_right_channel(const ChannelLayout *layout, int stream_id, int prev)
      70             : {
      71             :    int i;
      72           0 :    i = (prev<0) ? 0 : prev+1;
      73           0 :    for (;i<layout->nb_channels;i++)
      74             :    {
      75           0 :       if (layout->mapping[i]==stream_id*2+1)
      76           0 :          return i;
      77             :    }
      78           0 :    return -1;
      79             : }
      80             : 
      81           0 : int get_mono_channel(const ChannelLayout *layout, int stream_id, int prev)
      82             : {
      83             :    int i;
      84           0 :    i = (prev<0) ? 0 : prev+1;
      85           0 :    for (;i<layout->nb_channels;i++)
      86             :    {
      87           0 :       if (layout->mapping[i]==stream_id+layout->nb_coupled_streams)
      88           0 :          return i;
      89             :    }
      90           0 :    return -1;
      91             : }
      92             :