Mercurial > hg > audiostuff
annotate spandsp-0.0.6pre17/src/spandsp/g722.h @ 6:22a74b01a099 default tip
implement more meaningful test program
author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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date | Fri, 25 Jun 2010 16:14:50 +0200 |
parents | 26cd8f1ef0b1 |
children |
rev | line source |
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4
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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1 /* |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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2 * SpanDSP - a series of DSP components for telephony |
26cd8f1ef0b1
import spandsp-0.0.6pre17
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3 * |
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import spandsp-0.0.6pre17
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4 * g722.h - The ITU G.722 codec. |
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import spandsp-0.0.6pre17
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5 * |
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import spandsp-0.0.6pre17
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6 * Written by Steve Underwood <steveu@coppice.org> |
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7 * |
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import spandsp-0.0.6pre17
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8 * Copyright (C) 2005 Steve Underwood |
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9 * |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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10 * All rights reserved. |
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11 * |
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import spandsp-0.0.6pre17
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12 * This program is free software; you can redistribute it and/or modify |
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import spandsp-0.0.6pre17
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13 * it under the terms of the GNU Lesser General Public License version 2.1, |
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14 * as published by the Free Software Foundation. |
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15 * |
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import spandsp-0.0.6pre17
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16 * This program is distributed in the hope that it will be useful, |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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17 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
26cd8f1ef0b1
import spandsp-0.0.6pre17
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18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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19 * GNU Lesser General Public License for more details. |
26cd8f1ef0b1
import spandsp-0.0.6pre17
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parents:
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20 * |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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21 * You should have received a copy of the GNU Lesser General Public |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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22 * License along with this program; if not, write to the Free Software |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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24 * |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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25 * Based on a single channel G.722 codec which is: |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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26 * |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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27 ***** Copyright (c) CMU 1993 ***** |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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28 * Computer Science, Speech Group |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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29 * Chengxiang Lu and Alex Hauptmann |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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30 * |
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import spandsp-0.0.6pre17
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31 * $Id: g722.h,v 1.26 2009/04/12 09:12:10 steveu Exp $ |
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32 */ |
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import spandsp-0.0.6pre17
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33 |
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parents:
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34 |
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35 /*! \file */ |
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36 |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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37 #if !defined(_SPANDSP_G722_H_) |
26cd8f1ef0b1
import spandsp-0.0.6pre17
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38 #define _SPANDSP_G722_H_ |
26cd8f1ef0b1
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parents:
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39 |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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40 /*! \page g722_page G.722 encoding and decoding |
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import spandsp-0.0.6pre17
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41 \section g722_page_sec_1 What does it do? |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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42 The G.722 module is a bit exact implementation of the ITU G.722 specification for all three |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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43 specified bit rates - 64000bps, 56000bps and 48000bps. It passes the ITU tests. |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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44 |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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45 To allow fast and flexible interworking with narrow band telephony, the encoder and decoder |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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46 support an option for the linear audio to be an 8k samples/second stream. In this mode the |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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47 codec is considerably faster, and still fully compatible with wideband terminals using G.722. |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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48 |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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49 \section g722_page_sec_2 How does it work? |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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50 ???. |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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51 */ |
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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52 |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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53 enum |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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54 { |
26cd8f1ef0b1
import spandsp-0.0.6pre17
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55 G722_SAMPLE_RATE_8000 = 0x0001, |
26cd8f1ef0b1
import spandsp-0.0.6pre17
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56 G722_PACKED = 0x0002 |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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57 }; |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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58 |
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parents:
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59 /*! |
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import spandsp-0.0.6pre17
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parents:
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60 G.722 encode state |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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61 */ |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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62 typedef struct g722_encode_state_s g722_encode_state_t; |
26cd8f1ef0b1
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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63 |
26cd8f1ef0b1
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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64 /*! |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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65 G.722 decode state |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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66 */ |
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import spandsp-0.0.6pre17
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67 typedef struct g722_decode_state_s g722_decode_state_t; |
26cd8f1ef0b1
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68 |
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69 #if defined(__cplusplus) |
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70 extern "C" |
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71 { |
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72 #endif |
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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73 |
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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74 /*! Initialise an G.722 encode context. |
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75 \param s The G.722 encode context. |
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import spandsp-0.0.6pre17
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parents:
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76 \param rate The required bit rate for the G.722 data. |
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import spandsp-0.0.6pre17
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77 The valid rates are 64000, 56000 and 48000. |
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78 \param options |
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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79 \return A pointer to the G.722 encode context, or NULL for error. */ |
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80 SPAN_DECLARE(g722_encode_state_t *) g722_encode_init(g722_encode_state_t *s, int rate, int options); |
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81 |
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82 /*! Release a G.722 encode context. |
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83 \param s The G.722 encode context. |
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84 \return 0 for OK. */ |
26cd8f1ef0b1
import spandsp-0.0.6pre17
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85 SPAN_DECLARE(int) g722_encode_release(g722_encode_state_t *s); |
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86 |
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87 /*! Free a G.722 encode context. |
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88 \param s The G.722 encode context. |
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89 \return 0 for OK. */ |
26cd8f1ef0b1
import spandsp-0.0.6pre17
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90 SPAN_DECLARE(int) g722_encode_free(g722_encode_state_t *s); |
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91 |
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92 /*! Encode a buffer of linear PCM data to G.722 |
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93 \param s The G.722 context. |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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94 \param g722_data The G.722 data produced. |
26cd8f1ef0b1
import spandsp-0.0.6pre17
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95 \param amp The audio sample buffer. |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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96 \param len The number of samples in the buffer. |
26cd8f1ef0b1
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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97 \return The number of bytes of G.722 data produced. */ |
26cd8f1ef0b1
import spandsp-0.0.6pre17
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parents:
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98 SPAN_DECLARE(int) g722_encode(g722_encode_state_t *s, uint8_t g722_data[], const int16_t amp[], int len); |
26cd8f1ef0b1
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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99 |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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100 /*! Initialise an G.722 decode context. |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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101 \param s The G.722 decode context. |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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102 \param rate The bit rate of the G.722 data. |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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103 The valid rates are 64000, 56000 and 48000. |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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104 \param options |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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105 \return A pointer to the G.722 decode context, or NULL for error. */ |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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106 SPAN_DECLARE(g722_decode_state_t *) g722_decode_init(g722_decode_state_t *s, int rate, int options); |
26cd8f1ef0b1
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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107 |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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108 /*! Release a G.722 decode context. |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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109 \param s The G.722 decode context. |
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import spandsp-0.0.6pre17
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110 \return 0 for OK. */ |
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import spandsp-0.0.6pre17
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111 SPAN_DECLARE(int) g722_decode_release(g722_decode_state_t *s); |
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import spandsp-0.0.6pre17
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parents:
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112 |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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113 /*! Free a G.722 decode context. |
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import spandsp-0.0.6pre17
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parents:
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114 \param s The G.722 decode context. |
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import spandsp-0.0.6pre17
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parents:
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115 \return 0 for OK. */ |
26cd8f1ef0b1
import spandsp-0.0.6pre17
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parents:
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116 SPAN_DECLARE(int) g722_decode_free(g722_decode_state_t *s); |
26cd8f1ef0b1
import spandsp-0.0.6pre17
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parents:
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117 |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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118 /*! Decode a buffer of G.722 data to linear PCM. |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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119 \param s The G.722 context. |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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120 \param amp The audio sample buffer. |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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121 \param g722_data |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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122 \param len |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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123 \return The number of samples returned. */ |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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124 SPAN_DECLARE(int) g722_decode(g722_decode_state_t *s, int16_t amp[], const uint8_t g722_data[], int len); |
26cd8f1ef0b1
import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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125 |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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126 #if defined(__cplusplus) |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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127 } |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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128 #endif |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
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129 |
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import spandsp-0.0.6pre17
Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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130 #endif |