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author | Sean Bartell <wingedtachikoma@gmail.com> | 2011-06-25 21:32:25 -0400 |
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committer | Nils Wallménius <nils@rockbox.org> | 2012-04-25 22:13:20 +0200 |
commit | f40bfc9267b13b54e6379dfe7539447662879d24 (patch) | |
tree | 9b20069d5e62809ff434061ad730096836f916f2 /lib/rbcodec/codecs/libspeex/vorbis_psy.h | |
parent | a0009907de7a0107d49040d8a180f140e2eff299 (diff) | |
download | rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.tar.gz rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.zip |
Add codecs to librbcodec.
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
Diffstat (limited to 'lib/rbcodec/codecs/libspeex/vorbis_psy.h')
-rw-r--r-- | lib/rbcodec/codecs/libspeex/vorbis_psy.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libspeex/vorbis_psy.h b/lib/rbcodec/codecs/libspeex/vorbis_psy.h new file mode 100644 index 0000000000..6871057753 --- /dev/null +++ b/lib/rbcodec/codecs/libspeex/vorbis_psy.h | |||
@@ -0,0 +1,97 @@ | |||
1 | /* Copyright (C) 2005 Jean-Marc Valin, CSIRO, Christopher Montgomery | ||
2 | File: vorbis_psy.h | ||
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 | - Neither the name of the Xiph.org Foundation nor the names of its | ||
16 | contributors may be used to endorse or promote products derived from | ||
17 | this software without specific prior written permission. | ||
18 | |||
19 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
20 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
21 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
22 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR | ||
23 | CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | ||
24 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | ||
25 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | ||
26 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | ||
27 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | ||
28 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
29 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
30 | */ | ||
31 | |||
32 | #ifndef VORBIS_PSY_H | ||
33 | #define VORBIS_PSY_H | ||
34 | |||
35 | #ifdef VORBIS_PSYCHO | ||
36 | |||
37 | #include "smallft.h" | ||
38 | #define P_BANDS 17 /* 62Hz to 16kHz */ | ||
39 | #define NOISE_COMPAND_LEVELS 40 | ||
40 | |||
41 | |||
42 | #define todB(x) ((x)>1e-13?log((x)*(x))*4.34294480f:-30) | ||
43 | #define fromdB(x) (exp((x)*.11512925f)) | ||
44 | |||
45 | /* The bark scale equations are approximations, since the original | ||
46 | table was somewhat hand rolled. The below are chosen to have the | ||
47 | best possible fit to the rolled tables, thus their somewhat odd | ||
48 | appearance (these are more accurate and over a longer range than | ||
49 | the oft-quoted bark equations found in the texts I have). The | ||
50 | approximations are valid from 0 - 30kHz (nyquist) or so. | ||
51 | |||
52 | all f in Hz, z in Bark */ | ||
53 | |||
54 | #define toBARK(n) (13.1f*atan(.00074f*(n))+2.24f*atan((n)*(n)*1.85e-8f)+1e-4f*(n)) | ||
55 | #define fromBARK(z) (102.f*(z)-2.f*pow(z,2.f)+.4f*pow(z,3.f)+pow(1.46f,z)-1.f) | ||
56 | |||
57 | /* Frequency to octave. We arbitrarily declare 63.5 Hz to be octave | ||
58 | 0.0 */ | ||
59 | |||
60 | #define toOC(n) (log(n)*1.442695f-5.965784f) | ||
61 | #define fromOC(o) (exp(((o)+5.965784f)*.693147f)) | ||
62 | |||
63 | |||
64 | typedef struct { | ||
65 | |||
66 | float noisewindowlo; | ||
67 | float noisewindowhi; | ||
68 | int noisewindowlomin; | ||
69 | int noisewindowhimin; | ||
70 | int noisewindowfixed; | ||
71 | float noiseoff[P_BANDS]; | ||
72 | float noisecompand[NOISE_COMPAND_LEVELS]; | ||
73 | |||
74 | } VorbisPsyInfo; | ||
75 | |||
76 | |||
77 | |||
78 | typedef struct { | ||
79 | int n; | ||
80 | int rate; | ||
81 | struct drft_lookup lookup; | ||
82 | VorbisPsyInfo *vi; | ||
83 | |||
84 | float *window; | ||
85 | float *noiseoffset; | ||
86 | long *bark; | ||
87 | |||
88 | } VorbisPsy; | ||
89 | |||
90 | |||
91 | VorbisPsy *vorbis_psy_init(int rate, int size); | ||
92 | void vorbis_psy_destroy(VorbisPsy *psy); | ||
93 | void compute_curve(VorbisPsy *psy, float *audio, float *curve); | ||
94 | void curve_to_lpc(VorbisPsy *psy, float *curve, float *awk1, float *awk2, int ord); | ||
95 | |||
96 | #endif | ||
97 | #endif | ||