Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -0400 | [diff] [blame] | 1 | /*********************************************************************** |
| 2 | Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| 3 | Redistribution and use in source and binary forms, with or without |
| 4 | modification, are permitted provided that the following conditions |
| 5 | are met: |
| 6 | - Redistributions of source code must retain the above copyright notice, |
| 7 | this list of conditions and the following disclaimer. |
| 8 | - Redistributions in binary form must reproduce the above copyright |
| 9 | notice, this list of conditions and the following disclaimer in the |
| 10 | documentation and/or other materials provided with the distribution. |
| 11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the |
| 12 | names of specific contributors, may be used to endorse or promote |
| 13 | products derived from this software without specific prior written |
| 14 | permission. |
| 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” |
| 16 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 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 |
| 22 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 23 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 24 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 25 | POSSIBILITY OF SUCH DAMAGE. |
| 26 | ***********************************************************************/ |
| 27 | |
| 28 | #ifndef SILK_RESAMPLER_PRIVATE_H |
| 29 | #define SILK_RESAMPLER_PRIVATE_H |
| 30 | |
| 31 | #ifdef __cplusplus |
| 32 | extern "C" { |
| 33 | #endif |
| 34 | |
| 35 | #include "SigProc_FIX.h" |
| 36 | #include "resampler_structs.h" |
| 37 | #include "resampler_rom.h" |
| 38 | |
| 39 | /* Number of input samples to process in the inner loop */ |
| 40 | #define RESAMPLER_MAX_BATCH_SIZE_MS 10 |
| 41 | #define RESAMPLER_MAX_FS_KHZ 48 |
| 42 | #define RESAMPLER_MAX_BATCH_SIZE_IN ( RESAMPLER_MAX_BATCH_SIZE_MS * RESAMPLER_MAX_FS_KHZ ) |
| 43 | |
| 44 | /* Description: Hybrid IIR/FIR polyphase implementation of resampling */ |
| 45 | void silk_resampler_private_IIR_FIR( |
| 46 | void *SS, /* I/O Resampler state */ |
| 47 | opus_int16 out[], /* O Output signal */ |
| 48 | const opus_int16 in[], /* I Input signal */ |
| 49 | opus_int32 inLen /* I Number of input samples */ |
| 50 | ); |
| 51 | |
| 52 | /* Description: Hybrid IIR/FIR polyphase implementation of resampling */ |
| 53 | void silk_resampler_private_down_FIR( |
| 54 | void *SS, /* I/O Resampler state */ |
| 55 | opus_int16 out[], /* O Output signal */ |
| 56 | const opus_int16 in[], /* I Input signal */ |
| 57 | opus_int32 inLen /* I Number of input samples */ |
| 58 | ); |
| 59 | |
| 60 | /* Upsample by a factor 2, high quality */ |
| 61 | void silk_resampler_private_up2_HQ_wrapper( |
| 62 | void *SS, /* I/O Resampler state (unused) */ |
| 63 | opus_int16 *out, /* O Output signal [ 2 * len ] */ |
| 64 | const opus_int16 *in, /* I Input signal [ len ] */ |
| 65 | opus_int32 len /* I Number of input samples */ |
| 66 | ); |
| 67 | |
| 68 | /* Upsample by a factor 2, high quality */ |
| 69 | void silk_resampler_private_up2_HQ( |
| 70 | opus_int32 *S, /* I/O Resampler state [ 6 ] */ |
| 71 | opus_int16 *out, /* O Output signal [ 2 * len ] */ |
| 72 | const opus_int16 *in, /* I Input signal [ len ] */ |
| 73 | opus_int32 len /* I Number of input samples */ |
| 74 | ); |
| 75 | |
| 76 | /* Second order AR filter */ |
| 77 | void silk_resampler_private_AR2( |
| 78 | opus_int32 S[], /* I/O State vector [ 2 ] */ |
| 79 | opus_int32 out_Q8[], /* O Output signal */ |
| 80 | const opus_int16 in[], /* I Input signal */ |
| 81 | const opus_int16 A_Q14[], /* I AR coefficients, Q14 */ |
| 82 | opus_int32 len /* I Signal length */ |
| 83 | ); |
| 84 | |
| 85 | #ifdef __cplusplus |
| 86 | } |
| 87 | #endif |
| 88 | #endif /* SILK_RESAMPLER_PRIVATE_H */ |