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Initial opus codec support

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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>
This commit is contained in:
Frederik M J Vestre 2012-07-26 14:38:32 +02:00 • committed by Bertrik Sikken
parent 72ebcbf73b
commit 1b8e3801b2
127 changed files with 28373 additions and 2 deletions
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46
lib/rbcodec/codecs/libopus/silk/lin2log.c Normal file
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/***********************************************************************
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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***********************************************************************/
#ifdef HAVE_CONFIG_H
#include "opus_config.h"
#endif
#include "SigProc_FIX.h"
/* Approximation of 128 * log2() (very close inverse of silk_log2lin()) */
/* Convert input to a log scale */
opus_int32 silk_lin2log(
const opus_int32 inLin /* I input in linear scale */
)
{
opus_int32 lz, frac_Q7;
silk_CLZ_FRAC( inLin, &lz, &frac_Q7 );
/* Piece-wise parabolic approximation */
return silk_LSHIFT( 31 - lz, 7 ) + silk_SMLAWB( frac_Q7, silk_MUL( frac_Q7, 128 - frac_Q7 ), 179 );
}