media/libopus/src/opus_multistream.c@b8a032363ba2 (annotated)
media/libopus/src/opus_multistream.c
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* Copyright (c) 2011 Xiph.Org Foundation |
| michael@0 | 2 | Written by Jean-Marc Valin */ |
| michael@0 | 3 | /* |
| michael@0 | 4 | Redistribution and use in source and binary forms, with or without |
| michael@0 | 5 | modification, are permitted provided that the following conditions |
| michael@0 | 6 | are met: |
| michael@0 | 7 | |
| michael@0 | 8 | - Redistributions of source code must retain the above copyright |
| michael@0 | 9 | notice, this list of conditions and the following disclaimer. |
| michael@0 | 10 | |
| michael@0 | 11 | - Redistributions in binary form must reproduce the above copyright |
| michael@0 | 12 | notice, this list of conditions and the following disclaimer in the |
| michael@0 | 13 | documentation and/or other materials provided with the distribution. |
| michael@0 | 14 | |
| michael@0 | 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| michael@0 | 16 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| michael@0 | 17 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| michael@0 | 18 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER |
| michael@0 | 19 | OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| michael@0 | 20 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| michael@0 | 21 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| michael@0 | 22 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| michael@0 | 23 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| michael@0 | 24 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| michael@0 | 25 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 26 | */ |
| michael@0 | 27 | |
| michael@0 | 28 | #ifdef HAVE_CONFIG_H |
| michael@0 | 29 | #include "config.h" |
| michael@0 | 30 | #endif |
| michael@0 | 31 | |
| michael@0 | 32 | #include "opus_multistream.h" |
| michael@0 | 33 | #include "opus.h" |
| michael@0 | 34 | #include "opus_private.h" |
| michael@0 | 35 | #include "stack_alloc.h" |
| michael@0 | 36 | #include <stdarg.h> |
| michael@0 | 37 | #include "float_cast.h" |
| michael@0 | 38 | #include "os_support.h" |
| michael@0 | 39 | |
| michael@0 | 40 | |
| michael@0 | 41 | int validate_layout(const ChannelLayout *layout) |
| michael@0 | 42 | { |
| michael@0 | 43 | int i, max_channel; |
| michael@0 | 44 | |
| michael@0 | 45 | max_channel = layout->nb_streams+layout->nb_coupled_streams; |
| michael@0 | 46 | if (max_channel>255) |
| michael@0 | 47 | return 0; |
| michael@0 | 48 | for (i=0;i<layout->nb_channels;i++) |
| michael@0 | 49 | { |
| michael@0 | 50 | if (layout->mapping[i] >= max_channel && layout->mapping[i] != 255) |
| michael@0 | 51 | return 0; |
| michael@0 | 52 | } |
| michael@0 | 53 | return 1; |
| michael@0 | 54 | } |
| michael@0 | 55 | |
| michael@0 | 56 | |
| michael@0 | 57 | int get_left_channel(const ChannelLayout *layout, int stream_id, int prev) |
| michael@0 | 58 | { |
| michael@0 | 59 | int i; |
| michael@0 | 60 | i = (prev<0) ? 0 : prev+1; |
| michael@0 | 61 | for (;i<layout->nb_channels;i++) |
| michael@0 | 62 | { |
| michael@0 | 63 | if (layout->mapping[i]==stream_id*2) |
| michael@0 | 64 | return i; |
| michael@0 | 65 | } |
| michael@0 | 66 | return -1; |
| michael@0 | 67 | } |
| michael@0 | 68 | |
| michael@0 | 69 | int get_right_channel(const ChannelLayout *layout, int stream_id, int prev) |
| michael@0 | 70 | { |
| michael@0 | 71 | int i; |
| michael@0 | 72 | i = (prev<0) ? 0 : prev+1; |
| michael@0 | 73 | for (;i<layout->nb_channels;i++) |
| michael@0 | 74 | { |
| michael@0 | 75 | if (layout->mapping[i]==stream_id*2+1) |
| michael@0 | 76 | return i; |
| michael@0 | 77 | } |
| michael@0 | 78 | return -1; |
| michael@0 | 79 | } |
| michael@0 | 80 | |
| michael@0 | 81 | int get_mono_channel(const ChannelLayout *layout, int stream_id, int prev) |
| michael@0 | 82 | { |
| michael@0 | 83 | int i; |
| michael@0 | 84 | i = (prev<0) ? 0 : prev+1; |
| michael@0 | 85 | for (;i<layout->nb_channels;i++) |
| michael@0 | 86 | { |
| michael@0 | 87 | if (layout->mapping[i]==stream_id+layout->nb_coupled_streams) |
| michael@0 | 88 | return i; |
| michael@0 | 89 | } |
| michael@0 | 90 | return -1; |
| michael@0 | 91 | } |
| michael@0 | 92 |
