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author | Frederik M J Vestre <freqmod@gmail.com> | 2012-07-26 14:38:32 +0200 |
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committer | Bertrik Sikken <bertrik@sikken.nl> | 2012-09-20 20:47:44 +0200 |
commit | 1b8e3801b2444f6e466e1b7c09cfc51605e80fb3 (patch) | |
tree | bd1d6fe08452d388d0d160ec02e03963f3f9525d /lib/rbcodec/codecs/libopus/silk/lin2log.c | |
parent | 72ebcbf73b4db911d517a66c820fdceccb8ec798 (diff) | |
download | rockbox-1b8e3801b2444f6e466e1b7c09cfc51605e80fb3.tar.gz rockbox-1b8e3801b2444f6e466e1b7c09cfc51605e80fb3.zip |
Initial opus codec support
Synchronised with opus repo on github (https://github.com/freqmod/rockbox-opus)
Status:
* Seeking ported from speex, but fails on some cases (e.g. seek to granule 0)
* ReplayGain parsing needs to be reworked, we do vorbis-style replaygain now.
http://wiki.xiph.org/OggOpus#Comment_Header explicitly forbids these in
favour of R128_TRACK_GAIN tag.
* No optimisation yet, source files still nearly identical to opus upstream
* Multi-stream opus files may not be parsed correctly
Change-Id: Ia66f1027dc1d288083e3c57b2816700078376f9a
Reviewed-on: http://gerrit.rockbox.org/300
Reviewed-by: Bertrik Sikken <bertrik@sikken.nl>
Tested-by: Bertrik Sikken <bertrik@sikken.nl>
Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/lin2log.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/lin2log.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/lin2log.c b/lib/rbcodec/codecs/libopus/silk/lin2log.c new file mode 100644 index 0000000000..68ea030c89 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/lin2log.c | |||
@@ -0,0 +1,46 @@ | |||
1 | /*********************************************************************** | ||
2 | Copyright (c) 2006-2011, Skype Limited. All rights reserved. | ||
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9 | notice, this list of conditions and the following disclaimer in the | ||
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13 | products derived from this software without specific prior written | ||
14 | permission. | ||
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18 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | ||
19 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
20 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | ||
21 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
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23 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||
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25 | POSSIBILITY OF SUCH DAMAGE. | ||
26 | ***********************************************************************/ | ||
27 | |||
28 | #ifdef HAVE_CONFIG_H | ||
29 | #include "opus_config.h" | ||
30 | #endif | ||
31 | |||
32 | #include "SigProc_FIX.h" | ||
33 | /* Approximation of 128 * log2() (very close inverse of silk_log2lin()) */ | ||
34 | /* Convert input to a log scale */ | ||
35 | opus_int32 silk_lin2log( | ||
36 | const opus_int32 inLin /* I input in linear scale */ | ||
37 | ) | ||
38 | { | ||
39 | opus_int32 lz, frac_Q7; | ||
40 | |||
41 | silk_CLZ_FRAC( inLin, &lz, &frac_Q7 ); | ||
42 | |||
43 | /* Piece-wise parabolic approximation */ | ||
44 | return silk_LSHIFT( 31 - lz, 7 ) + silk_SMLAWB( frac_Q7, silk_MUL( frac_Q7, 128 - frac_Q7 ), 179 ); | ||
45 | } | ||
46 | |||