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-rw-r--r--media/libopus/src/opus_multistream.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/media/libopus/src/opus_multistream.c b/media/libopus/src/opus_multistream.c
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+++ b/media/libopus/src/opus_multistream.c
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+/* Copyright (c) 2011 Xiph.Org Foundation
+ Written by Jean-Marc Valin */
+/*
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ - Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ - Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+ OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "opus_multistream.h"
+#include "opus.h"
+#include "opus_private.h"
+#include "stack_alloc.h"
+#include <stdarg.h>
+#include "float_cast.h"
+#include "os_support.h"
+
+
+int validate_layout(const ChannelLayout *layout)
+{
+ int i, max_channel;
+
+ max_channel = layout->nb_streams+layout->nb_coupled_streams;
+ if (max_channel>255)
+ return 0;
+ for (i=0;i<layout->nb_channels;i++)
+ {
+ if (layout->mapping[i] >= max_channel && layout->mapping[i] != 255)
+ return 0;
+ }
+ return 1;
+}
+
+
+int get_left_channel(const ChannelLayout *layout, int stream_id, int prev)
+{
+ int i;
+ i = (prev<0) ? 0 : prev+1;
+ for (;i<layout->nb_channels;i++)
+ {
+ if (layout->mapping[i]==stream_id*2)
+ return i;
+ }
+ return -1;
+}
+
+int get_right_channel(const ChannelLayout *layout, int stream_id, int prev)
+{
+ int i;
+ i = (prev<0) ? 0 : prev+1;
+ for (;i<layout->nb_channels;i++)
+ {
+ if (layout->mapping[i]==stream_id*2+1)
+ return i;
+ }
+ return -1;
+}
+
+int get_mono_channel(const ChannelLayout *layout, int stream_id, int prev)
+{
+ int i;
+ i = (prev<0) ? 0 : prev+1;
+ for (;i<layout->nb_channels;i++)
+ {
+ if (layout->mapping[i]==stream_id+layout->nb_coupled_streams)
+ return i;
+ }
+ return -1;
+}
+