diff options
Diffstat (limited to 'lib/rbcodec/codecs/libopus/opus_multistream.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/opus_multistream.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/opus_multistream.c b/lib/rbcodec/codecs/libopus/opus_multistream.c new file mode 100644 index 0000000000..09c3639b7f --- /dev/null +++ b/lib/rbcodec/codecs/libopus/opus_multistream.c | |||
@@ -0,0 +1,92 @@ | |||
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 | |||