1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/src/opus_multistream.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,92 @@
1.4 +/* Copyright (c) 2011 Xiph.Org Foundation
1.5 + Written by Jean-Marc Valin */
1.6 +/*
1.7 + Redistribution and use in source and binary forms, with or without
1.8 + modification, are permitted provided that the following conditions
1.9 + are met:
1.10 +
1.11 + - Redistributions of source code must retain the above copyright
1.12 + notice, this list of conditions and the following disclaimer.
1.13 +
1.14 + - Redistributions in binary form must reproduce the above copyright
1.15 + notice, this list of conditions and the following disclaimer in the
1.16 + documentation and/or other materials provided with the distribution.
1.17 +
1.18 + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1.19 + ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1.20 + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
1.21 + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
1.22 + OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
1.23 + EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
1.24 + PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
1.25 + PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
1.26 + LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
1.27 + NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
1.28 + SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.29 +*/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +#include "opus_multistream.h"
1.36 +#include "opus.h"
1.37 +#include "opus_private.h"
1.38 +#include "stack_alloc.h"
1.39 +#include <stdarg.h>
1.40 +#include "float_cast.h"
1.41 +#include "os_support.h"
1.42 +
1.43 +
1.44 +int validate_layout(const ChannelLayout *layout)
1.45 +{
1.46 + int i, max_channel;
1.47 +
1.48 + max_channel = layout->nb_streams+layout->nb_coupled_streams;
1.49 + if (max_channel>255)
1.50 + return 0;
1.51 + for (i=0;i<layout->nb_channels;i++)
1.52 + {
1.53 + if (layout->mapping[i] >= max_channel && layout->mapping[i] != 255)
1.54 + return 0;
1.55 + }
1.56 + return 1;
1.57 +}
1.58 +
1.59 +
1.60 +int get_left_channel(const ChannelLayout *layout, int stream_id, int prev)
1.61 +{
1.62 + int i;
1.63 + i = (prev<0) ? 0 : prev+1;
1.64 + for (;i<layout->nb_channels;i++)
1.65 + {
1.66 + if (layout->mapping[i]==stream_id*2)
1.67 + return i;
1.68 + }
1.69 + return -1;
1.70 +}
1.71 +
1.72 +int get_right_channel(const ChannelLayout *layout, int stream_id, int prev)
1.73 +{
1.74 + int i;
1.75 + i = (prev<0) ? 0 : prev+1;
1.76 + for (;i<layout->nb_channels;i++)
1.77 + {
1.78 + if (layout->mapping[i]==stream_id*2+1)
1.79 + return i;
1.80 + }
1.81 + return -1;
1.82 +}
1.83 +
1.84 +int get_mono_channel(const ChannelLayout *layout, int stream_id, int prev)
1.85 +{
1.86 + int i;
1.87 + i = (prev<0) ? 0 : prev+1;
1.88 + for (;i<layout->nb_channels;i++)
1.89 + {
1.90 + if (layout->mapping[i]==stream_id+layout->nb_coupled_streams)
1.91 + return i;
1.92 + }
1.93 + return -1;
1.94 +}
1.95 +
