16
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1 |
/* GStreamer PCM to A-Law conversion
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2 |
* Copyright (C) 2000 by Abramo Bagnara <abramo@alsa-project.org>
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3 |
*
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4 |
* This library is free software; you can redistribute it and/or
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5 |
* modify it under the terms of the GNU Library General Public
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6 |
* License as published by the Free Software Foundation; either
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7 |
* version 2.1 of the License, or (at your option) any later version.
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8 |
*
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9 |
* This library is distributed in the hope that it will be useful,
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10 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 |
* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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15 |
* License along with this library; if not, write to the
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16 |
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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19 |
/**
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20 |
* SECTION:element-alawenc
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21 |
*
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22 |
* This element encode alaw audio. Alaw coding is also known as G.711.
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*/
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24 |
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25 |
#ifdef HAVE_CONFIG_H
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26 |
#include "config.h"
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27 |
#endif
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28 |
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29 |
#include "alaw-encode.h"
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30 |
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31 |
GST_DEBUG_CATEGORY_STATIC (alaw_enc_debug);
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32 |
#define GST_CAT_DEFAULT alaw_enc_debug
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33 |
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34 |
extern GstStaticPadTemplate alaw_enc_src_factory;
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35 |
extern GstStaticPadTemplate alaw_enc_sink_factory;
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36 |
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37 |
static GstFlowReturn gst_alaw_enc_chain (GstPad * pad, GstBuffer * buffer);
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38 |
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GST_BOILERPLATE (GstALawEnc, gst_alaw_enc, GstElement, GST_TYPE_ELEMENT);
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40 |
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41 |
/* some day we might have defines in gstconfig.h that tell us about the
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42 |
* desired cpu/memory/binary size trade-offs */
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#define GST_ALAW_ENC_USE_TABLE
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45 |
#ifdef GST_ALAW_ENC_USE_TABLE
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46 |
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47 |
static const guint8 alaw_encode[2048 + 1] = {
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48 |
0xd5, 0xd4, 0xd7, 0xd6, 0xd1, 0xd0, 0xd3, 0xd2, 0xdd, 0xdc, 0xdf, 0xde,
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49 |
0xd9, 0xd8, 0xdb, 0xda, 0xc5, 0xc4, 0xc7, 0xc6, 0xc1, 0xc0, 0xc3, 0xc2,
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50 |
0xcd, 0xcc, 0xcf, 0xce, 0xc9, 0xc8, 0xcb, 0xca, 0xf5, 0xf5, 0xf4, 0xf4,
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51 |
0xf7, 0xf7, 0xf6, 0xf6, 0xf1, 0xf1, 0xf0, 0xf0, 0xf3, 0xf3, 0xf2, 0xf2,
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52 |
0xfd, 0xfd, 0xfc, 0xfc, 0xff, 0xff, 0xfe, 0xfe, 0xf9, 0xf9, 0xf8, 0xf8,
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53 |
0xfb, 0xfb, 0xfa, 0xfa, 0xe5, 0xe5, 0xe5, 0xe5, 0xe4, 0xe4, 0xe4, 0xe4,
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54 |
0xe7, 0xe7, 0xe7, 0xe7, 0xe6, 0xe6, 0xe6, 0xe6, 0xe1, 0xe1, 0xe1, 0xe1,
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55 |
0xe0, 0xe0, 0xe0, 0xe0, 0xe3, 0xe3, 0xe3, 0xe3, 0xe2, 0xe2, 0xe2, 0xe2,
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56 |
0xed, 0xed, 0xed, 0xed, 0xec, 0xec, 0xec, 0xec, 0xef, 0xef, 0xef, 0xef,
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57 |
0xee, 0xee, 0xee, 0xee, 0xe9, 0xe9, 0xe9, 0xe9, 0xe8, 0xe8, 0xe8, 0xe8,
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58 |
0xeb, 0xeb, 0xeb, 0xeb, 0xea, 0xea, 0xea, 0xea, 0x95, 0x95, 0x95, 0x95,
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59 |
0x95, 0x95, 0x95, 0x95, 0x94, 0x94, 0x94, 0x94, 0x94, 0x94, 0x94, 0x94,
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60 |
0x97, 0x97, 0x97, 0x97, 0x97, 0x97, 0x97, 0x97, 0x96, 0x96, 0x96, 0x96,
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61 |
0x96, 0x96, 0x96, 0x96, 0x91, 0x91, 0x91, 0x91, 0x91, 0x91, 0x91, 0x91,
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62 |
0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x93, 0x93, 0x93, 0x93,
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63 |
0x93, 0x93, 0x93, 0x93, 0x92, 0x92, 0x92, 0x92, 0x92, 0x92, 0x92, 0x92,
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64 |
0x9d, 0x9d, 0x9d, 0x9d, 0x9d, 0x9d, 0x9d, 0x9d, 0x9c, 0x9c, 0x9c, 0x9c,
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65 |
0x9c, 0x9c, 0x9c, 0x9c, 0x9f, 0x9f, 0x9f, 0x9f, 0x9f, 0x9f, 0x9f, 0x9f,
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66 |
0x9e, 0x9e, 0x9e, 0x9e, 0x9e, 0x9e, 0x9e, 0x9e, 0x99, 0x99, 0x99, 0x99,
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67 |
0x99, 0x99, 0x99, 0x99, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98,
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68 |
0x9b, 0x9b, 0x9b, 0x9b, 0x9b, 0x9b, 0x9b, 0x9b, 0x9a, 0x9a, 0x9a, 0x9a,
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69 |
0x9a, 0x9a, 0x9a, 0x9a, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85,
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70 |
0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x84, 0x84, 0x84, 0x84,
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71 |
0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84,
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72 |
0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87,
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73 |
0x87, 0x87, 0x87, 0x87, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86,
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74 |
0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x81, 0x81, 0x81, 0x81,
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75 |
0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81,
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76 |
0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
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77 |
0x80, 0x80, 0x80, 0x80, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83,
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78 |
0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x82, 0x82, 0x82, 0x82,
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79 |
0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82,
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80 |
0x8d, 0x8d, 0x8d, 0x8d, 0x8d, 0x8d, 0x8d, 0x8d, 0x8d, 0x8d, 0x8d, 0x8d,
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81 |
0x8d, 0x8d, 0x8d, 0x8d, 0x8c, 0x8c, 0x8c, 0x8c, 0x8c, 0x8c, 0x8c, 0x8c,
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82 |
0x8c, 0x8c, 0x8c, 0x8c, 0x8c, 0x8c, 0x8c, 0x8c, 0x8f, 0x8f, 0x8f, 0x8f,
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83 |
0x8f, 0x8f, 0x8f, 0x8f, 0x8f, 0x8f, 0x8f, 0x8f, 0x8f, 0x8f, 0x8f, 0x8f,
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84 |
0x8e, 0x8e, 0x8e, 0x8e, 0x8e, 0x8e, 0x8e, 0x8e, 0x8e, 0x8e, 0x8e, 0x8e,
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85 |
0x8e, 0x8e, 0x8e, 0x8e, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89,
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86 |
0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x88, 0x88, 0x88, 0x88,
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87 |
0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,
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88 |
0x8b, 0x8b, 0x8b, 0x8b, 0x8b, 0x8b, 0x8b, 0x8b, 0x8b, 0x8b, 0x8b, 0x8b,
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89 |
0x8b, 0x8b, 0x8b, 0x8b, 0x8a, 0x8a, 0x8a, 0x8a, 0x8a, 0x8a, 0x8a, 0x8a,
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90 |
0x8a, 0x8a, 0x8a, 0x8a, 0x8a, 0x8a, 0x8a, 0x8a, 0xb5, 0xb5, 0xb5, 0xb5,
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91 |
0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5,
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92 |
0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5, 0xb5,
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93 |
0xb5, 0xb5, 0xb5, 0xb5, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4,
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94 |
0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4,
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95 |
0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4,
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96 |
0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7,
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97 |
0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7,
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98 |
0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb7, 0xb6, 0xb6, 0xb6, 0xb6,
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99 |
0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6,
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100 |
0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6, 0xb6,
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101 |
0xb6, 0xb6, 0xb6, 0xb6, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1,
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102 |
0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1,
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103 |
0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1, 0xb1,
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104 |
0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0,
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105 |
0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0,
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106 |
0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb0, 0xb3, 0xb3, 0xb3, 0xb3,
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107 |
0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3,
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108 |
0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3, 0xb3,
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109 |
0xb3, 0xb3, 0xb3, 0xb3, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2,
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110 |
0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2,
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111 |
0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2, 0xb2,
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112 |
0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd,
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113 |
0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd,
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114 |
0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbd, 0xbc, 0xbc, 0xbc, 0xbc,
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|
115 |
0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc,
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116 |
0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc, 0xbc,
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117 |
0xbc, 0xbc, 0xbc, 0xbc, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf,
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118 |
0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf,
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119 |
0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf,
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120 |
0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe,
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121 |
0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe,
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122 |
0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xbe, 0xb9, 0xb9, 0xb9, 0xb9,
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123 |
0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9,
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124 |
0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9, 0xb9,
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|
125 |
0xb9, 0xb9, 0xb9, 0xb9, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8,
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|
126 |
0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8,
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|
127 |
0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8, 0xb8,
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|
128 |
0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb,
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|
129 |
0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb,
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130 |
0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xbb, 0xba, 0xba, 0xba, 0xba,
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131 |
0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba,
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132 |
0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba, 0xba,
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|
133 |
0xba, 0xba, 0xba, 0xba, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5,
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|
134 |
0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5,
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|
135 |
0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5,
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|
136 |
0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5,
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|
137 |
0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5,
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|
138 |
0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa5, 0xa4, 0xa4, 0xa4, 0xa4,
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|
139 |
0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4,
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|
140 |
0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4,
|
|
141 |
0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4,
|
|
142 |
0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4,
|
|
143 |
0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4,
|
|
144 |
0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7,
|
|
145 |
0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7,
|
|
146 |
0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7,
|
|
147 |
0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7,
|
|
148 |
0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7,
|
|
149 |
0xa7, 0xa7, 0xa7, 0xa7, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6,
|
|
150 |
0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6,
|
|
151 |
0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6,
|
|
152 |
0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6,
|
|
153 |
0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6,
|
|
154 |
0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa1, 0xa1, 0xa1, 0xa1,
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|
155 |
0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1,
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|
156 |
0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1,
|
|
157 |
0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1,
|
|
158 |
0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1,
|
|
159 |
0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1,
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|
160 |
0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0,
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|
161 |
0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0,
|
|
162 |
0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0,
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|
163 |
0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0,
|
|
164 |
0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0,
|
|
165 |
0xa0, 0xa0, 0xa0, 0xa0, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3,
|
|
166 |
0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3,
|
|
167 |
0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3,
|
|
168 |
0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3,
|
|
169 |
0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3,
|
|
170 |
0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa2, 0xa2, 0xa2, 0xa2,
|
|
171 |
0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2,
|
|
172 |
0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2,
|
|
173 |
0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2,
|
|
174 |
0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2,
|
|
175 |
0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2,
|
|
176 |
0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad,
|
|
177 |
0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad,
|
|
178 |
0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad,
|
|
179 |
0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad,
|
|
180 |
0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad,
|
|
181 |
0xad, 0xad, 0xad, 0xad, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac,
|
|
182 |
0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac,
|
|
183 |
0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac,
|
|
184 |
0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac,
|
|
185 |
0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac,
|
|
186 |
0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xac, 0xaf, 0xaf, 0xaf, 0xaf,
|
|
187 |
0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf,
|
|
188 |
0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf,
|
|
189 |
0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf,
|
|
190 |
0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf,
|
|
191 |
0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf,
|
|
192 |
0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae,
|
|
193 |
0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae,
|
|
194 |
0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae,
|
|
195 |
0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae,
|
|
196 |
0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae,
|
|
197 |
0xae, 0xae, 0xae, 0xae, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9,
|
|
198 |
0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9,
|
|
199 |
0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9,
|
|
200 |
0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9,
|
|
201 |
0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9,
|
|
202 |
0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa8, 0xa8, 0xa8, 0xa8,
|
|
203 |
0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8,
|
|
204 |
0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8,
|
|
205 |
0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8,
|
|
206 |
0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8,
|
|
207 |
0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8,
|
|
208 |
0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab,
|
|
209 |
0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab,
|
|
210 |
0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab,
|
|
211 |
0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab,
|
|
212 |
0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab,
|
|
213 |
0xab, 0xab, 0xab, 0xab, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
|
|
214 |
0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
|
|
215 |
0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
|
|
216 |
0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
|
|
217 |
0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
|
|
218 |
0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0x2a
|
|
219 |
};
|
|
220 |
|
|
221 |
static inline guint8
|
|
222 |
s16_to_alaw (gint16 pcm_val)
|
|
223 |
{
|
|
224 |
if (pcm_val >= 0)
|
|
225 |
return alaw_encode[pcm_val / 16];
|
|
226 |
else
|
|
227 |
return (0x7F & alaw_encode[pcm_val / -16]);
|
|
228 |
}
|
|
229 |
|
|
230 |
#else /* GST_ALAW_ENC_USE_TABLE */
|
|
231 |
|
|
232 |
/*
|
|
233 |
* s16_to_alaw() - Convert a 16-bit linear PCM value to 8-bit A-law
|
|
234 |
*
|
|
235 |
* s16_to_alaw() accepts an 16-bit integer and encodes it as A-law data.
|
|
236 |
*
|
|
237 |
* Linear Input Code Compressed Code
|
|
238 |
* ------------------------ ---------------
|
|
239 |
* 0000000wxyza 000wxyz
|
|
240 |
* 0000001wxyza 001wxyz
|
|
241 |
* 000001wxyzab 010wxyz
|
|
242 |
* 00001wxyzabc 011wxyz
|
|
243 |
* 0001wxyzabcd 100wxyz
|
|
244 |
* 001wxyzabcde 101wxyz
|
|
245 |
* 01wxyzabcdef 110wxyz
|
|
246 |
* 1wxyzabcdefg 111wxyz
|
|
247 |
*
|
|
248 |
* For further information see John C. Bellamy's Digital Telephony, 1982,
|
|
249 |
* John Wiley & Sons, pps 98-111 and 472-476.
|
|
250 |
*/
|
|
251 |
|
|
252 |
static inline gint
|
|
253 |
val_seg (gint val)
|
|
254 |
{
|
|
255 |
gint r = 1;
|
|
256 |
|
|
257 |
val >>= 8;
|
|
258 |
if (val & 0xf0) {
|
|
259 |
val >>= 4;
|
|
260 |
r += 4;
|
|
261 |
}
|
|
262 |
if (val & 0x0c) {
|
|
263 |
val >>= 2;
|
|
264 |
r += 2;
|
|
265 |
}
|
|
266 |
if (val & 0x02)
|
|
267 |
r += 1;
|
|
268 |
return r;
|
|
269 |
}
|
|
270 |
|
|
271 |
static inline guint8
|
|
272 |
s16_to_alaw (gint pcm_val)
|
|
273 |
{
|
|
274 |
gint seg;
|
|
275 |
guint8 mask;
|
|
276 |
guint8 aval;
|
|
277 |
|
|
278 |
if (pcm_val >= 0) {
|
|
279 |
mask = 0xD5;
|
|
280 |
} else {
|
|
281 |
mask = 0x55;
|
|
282 |
pcm_val = -pcm_val;
|
|
283 |
if (pcm_val > 0x7fff)
|
|
284 |
pcm_val = 0x7fff;
|
|
285 |
}
|
|
286 |
|
|
287 |
if (pcm_val < 256)
|
|
288 |
aval = pcm_val >> 4;
|
|
289 |
else {
|
|
290 |
/* Convert the scaled magnitude to segment number. */
|
|
291 |
seg = val_seg (pcm_val);
|
|
292 |
aval = (seg << 4) | ((pcm_val >> (seg + 3)) & 0x0f);
|
|
293 |
}
|
|
294 |
return aval ^ mask;
|
|
295 |
}
|
|
296 |
|
|
297 |
#endif /* GST_ALAW_ENC_USE_TABLE */
|
|
298 |
|
|
299 |
static GstCaps *
|
|
300 |
gst_alaw_enc_getcaps (GstPad * pad)
|
|
301 |
{
|
|
302 |
GstALawEnc *alawenc;
|
|
303 |
GstPad *otherpad;
|
|
304 |
GstCaps *othercaps, *result;
|
|
305 |
const GstCaps *templ;
|
|
306 |
gchar *name;
|
|
307 |
gint i;
|
|
308 |
|
|
309 |
alawenc = GST_ALAW_ENC (GST_PAD_PARENT (pad));
|
|
310 |
|
|
311 |
/* figure out the name of the caps we are going to return */
|
|
312 |
if (pad == alawenc->srcpad) {
|
|
313 |
name = "audio/x-alaw";
|
|
314 |
otherpad = alawenc->sinkpad;
|
|
315 |
} else {
|
|
316 |
name = "audio/x-raw-int";
|
|
317 |
otherpad = alawenc->srcpad;
|
|
318 |
}
|
|
319 |
/* get caps from the peer, this can return NULL when there is no peer */
|
|
320 |
othercaps = gst_pad_peer_get_caps (otherpad);
|
|
321 |
|
|
322 |
/* get the template caps to make sure we return something acceptable */
|
|
323 |
templ = gst_pad_get_pad_template_caps (pad);
|
|
324 |
|
|
325 |
if (othercaps) {
|
|
326 |
/* there was a peer */
|
|
327 |
othercaps = gst_caps_make_writable (othercaps);
|
|
328 |
|
|
329 |
/* go through the caps and remove the fields we don't want */
|
|
330 |
for (i = 0; i < gst_caps_get_size (othercaps); i++) {
|
|
331 |
GstStructure *structure;
|
|
332 |
|
|
333 |
structure = gst_caps_get_structure (othercaps, i);
|
|
334 |
|
|
335 |
/* adjust the name */
|
|
336 |
gst_structure_set_name (structure, name);
|
|
337 |
|
|
338 |
if (pad == alawenc->srcpad) {
|
|
339 |
/* remove the fields we don't want */
|
|
340 |
gst_structure_remove_fields (structure, "width", "depth", "endianness",
|
|
341 |
"signed", NULL);
|
|
342 |
} else {
|
|
343 |
/* add fixed fields */
|
|
344 |
gst_structure_set (structure, "width", G_TYPE_INT, 16,
|
|
345 |
"depth", G_TYPE_INT, 16,
|
|
346 |
"endianness", G_TYPE_INT, G_BYTE_ORDER,
|
|
347 |
"signed", G_TYPE_BOOLEAN, TRUE, NULL);
|
|
348 |
}
|
|
349 |
}
|
|
350 |
/* filter against the allowed caps of the pad to return our result */
|
|
351 |
result = gst_caps_intersect (othercaps, templ);
|
|
352 |
gst_caps_unref (othercaps);
|
|
353 |
} else {
|
|
354 |
/* there was no peer, return the template caps */
|
|
355 |
result = gst_caps_copy (templ);
|
|
356 |
}
|
|
357 |
|
|
358 |
return result;
|
|
359 |
}
|
|
360 |
|
|
361 |
static gboolean
|
|
362 |
gst_alaw_enc_setcaps (GstPad * pad, GstCaps * caps)
|
|
363 |
{
|
|
364 |
GstALawEnc *alawenc;
|
|
365 |
GstPad *otherpad;
|
|
366 |
GstStructure *structure;
|
|
367 |
gboolean ret;
|
|
368 |
GstCaps *base_caps;
|
|
369 |
|
|
370 |
alawenc = GST_ALAW_ENC (GST_PAD_PARENT (pad));
|
|
371 |
|
|
372 |
structure = gst_caps_get_structure (caps, 0);
|
|
373 |
gst_structure_get_int (structure, "channels", &alawenc->channels);
|
|
374 |
gst_structure_get_int (structure, "rate", &alawenc->rate);
|
|
375 |
|
|
376 |
if (pad == alawenc->sinkpad) {
|
|
377 |
otherpad = alawenc->srcpad;
|
|
378 |
} else {
|
|
379 |
otherpad = alawenc->sinkpad;
|
|
380 |
}
|
|
381 |
|
|
382 |
base_caps = gst_caps_copy (gst_pad_get_pad_template_caps (otherpad));
|
|
383 |
structure = gst_caps_get_structure (base_caps, 0);
|
|
384 |
gst_structure_set (structure, "rate", G_TYPE_INT, alawenc->rate, NULL);
|
|
385 |
gst_structure_set (structure, "channels", G_TYPE_INT, alawenc->channels,
|
|
386 |
NULL);
|
|
387 |
|
|
388 |
GST_DEBUG_OBJECT (alawenc, "rate=%d, channels=%d", alawenc->rate,
|
|
389 |
alawenc->channels);
|
|
390 |
|
|
391 |
ret = gst_pad_set_caps (otherpad, base_caps);
|
|
392 |
|
|
393 |
gst_caps_unref (base_caps);
|
|
394 |
|
|
395 |
return ret;
|
|
396 |
}
|
|
397 |
|
|
398 |
static void
|
|
399 |
gst_alaw_enc_base_init (gpointer klass)
|
|
400 |
{
|
|
401 |
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
|
|
402 |
|
|
403 |
gst_element_class_add_pad_template (element_class,
|
|
404 |
gst_static_pad_template_get (&alaw_enc_src_factory));
|
|
405 |
gst_element_class_add_pad_template (element_class,
|
|
406 |
gst_static_pad_template_get (&alaw_enc_sink_factory));
|
|
407 |
|
|
408 |
gst_element_class_set_details_simple (element_class,
|
|
409 |
"A Law audio encoder", "Codec/Encoder/Audio",
|
|
410 |
"Convert 16bit PCM to 8bit A law",
|
|
411 |
"Zaheer Abbas Merali <zaheerabbas at merali dot org>");
|
|
412 |
|
|
413 |
GST_DEBUG_CATEGORY_INIT (alaw_enc_debug, "alawenc", 0, "A Law audio encoder");
|
|
414 |
}
|
|
415 |
|
|
416 |
static void
|
|
417 |
gst_alaw_enc_class_init (GstALawEncClass * klass)
|
|
418 |
{
|
|
419 |
/* nothing to do here for now */
|
|
420 |
}
|
|
421 |
|
|
422 |
static void
|
|
423 |
gst_alaw_enc_init (GstALawEnc * alawenc, GstALawEncClass * klass)
|
|
424 |
{
|
|
425 |
alawenc->sinkpad =
|
|
426 |
gst_pad_new_from_static_template (&alaw_enc_sink_factory, "sink");
|
|
427 |
gst_pad_set_setcaps_function (alawenc->sinkpad,
|
|
428 |
GST_DEBUG_FUNCPTR (gst_alaw_enc_setcaps));
|
|
429 |
gst_pad_set_getcaps_function (alawenc->sinkpad,
|
|
430 |
GST_DEBUG_FUNCPTR (gst_alaw_enc_getcaps));
|
|
431 |
gst_pad_set_chain_function (alawenc->sinkpad,
|
|
432 |
GST_DEBUG_FUNCPTR (gst_alaw_enc_chain));
|
|
433 |
gst_element_add_pad (GST_ELEMENT (alawenc), alawenc->sinkpad);
|
|
434 |
|
|
435 |
alawenc->srcpad =
|
|
436 |
gst_pad_new_from_static_template (&alaw_enc_src_factory, "src");
|
|
437 |
gst_pad_set_setcaps_function (alawenc->srcpad,
|
|
438 |
GST_DEBUG_FUNCPTR (gst_alaw_enc_setcaps));
|
|
439 |
gst_pad_set_getcaps_function (alawenc->srcpad,
|
|
440 |
GST_DEBUG_FUNCPTR (gst_alaw_enc_getcaps));
|
|
441 |
gst_pad_use_fixed_caps (alawenc->srcpad);
|
|
442 |
gst_element_add_pad (GST_ELEMENT (alawenc), alawenc->srcpad);
|
|
443 |
|
|
444 |
/* init rest */
|
|
445 |
alawenc->channels = 0;
|
|
446 |
alawenc->rate = 0;
|
|
447 |
}
|
|
448 |
|
|
449 |
static GstFlowReturn
|
|
450 |
gst_alaw_enc_chain (GstPad * pad, GstBuffer * buffer)
|
|
451 |
{
|
|
452 |
GstALawEnc *alawenc;
|
|
453 |
gint16 *linear_data;
|
|
454 |
guint linear_size;
|
|
455 |
guint8 *alaw_data;
|
|
456 |
guint alaw_size;
|
|
457 |
GstBuffer *outbuf;
|
|
458 |
gint i;
|
|
459 |
GstFlowReturn ret;
|
|
460 |
GstClockTime timestamp, duration;
|
|
461 |
|
|
462 |
alawenc = GST_ALAW_ENC (GST_PAD_PARENT (pad));
|
|
463 |
|
|
464 |
if (G_UNLIKELY (alawenc->rate == 0 || alawenc->channels == 0))
|
|
465 |
goto not_negotiated;
|
|
466 |
|
|
467 |
linear_data = (gint16 *) GST_BUFFER_DATA (buffer);
|
|
468 |
linear_size = GST_BUFFER_SIZE (buffer);
|
|
469 |
|
|
470 |
alaw_size = linear_size / 2;
|
|
471 |
|
|
472 |
timestamp = GST_BUFFER_TIMESTAMP (buffer);
|
|
473 |
duration = GST_BUFFER_DURATION (buffer);
|
|
474 |
|
|
475 |
GST_LOG_OBJECT (alawenc, "buffer with ts=%" GST_TIME_FORMAT,
|
|
476 |
GST_TIME_ARGS (timestamp));
|
|
477 |
|
|
478 |
ret =
|
|
479 |
gst_pad_alloc_buffer_and_set_caps (alawenc->srcpad,
|
|
480 |
GST_BUFFER_OFFSET_NONE, alaw_size, GST_PAD_CAPS (alawenc->srcpad),
|
|
481 |
&outbuf);
|
|
482 |
if (ret != GST_FLOW_OK)
|
|
483 |
goto done;
|
|
484 |
|
|
485 |
if (duration == GST_CLOCK_TIME_NONE) {
|
|
486 |
duration = gst_util_uint64_scale_int (alaw_size,
|
|
487 |
GST_SECOND, alawenc->rate * alawenc->channels);
|
|
488 |
}
|
|
489 |
|
|
490 |
if (GST_BUFFER_SIZE (outbuf) < alaw_size) {
|
|
491 |
/* pad-alloc can return a smaller buffer */
|
|
492 |
gst_buffer_unref (outbuf);
|
|
493 |
outbuf = gst_buffer_new_and_alloc (alaw_size);
|
|
494 |
}
|
|
495 |
|
|
496 |
alaw_data = (guint8 *) GST_BUFFER_DATA (outbuf);
|
|
497 |
|
|
498 |
/* copy discont flag */
|
|
499 |
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
|
|
500 |
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
|
|
501 |
|
|
502 |
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
|
|
503 |
GST_BUFFER_DURATION (outbuf) = duration;
|
|
504 |
|
|
505 |
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (alawenc->srcpad));
|
|
506 |
|
|
507 |
for (i = 0; i < alaw_size; i++) {
|
|
508 |
alaw_data[i] = s16_to_alaw (linear_data[i]);
|
|
509 |
}
|
|
510 |
|
|
511 |
ret = gst_pad_push (alawenc->srcpad, outbuf);
|
|
512 |
|
|
513 |
done:
|
|
514 |
|
|
515 |
gst_buffer_unref (buffer);
|
|
516 |
|
|
517 |
return ret;
|
|
518 |
|
|
519 |
not_negotiated:
|
|
520 |
{
|
|
521 |
ret = GST_FLOW_NOT_NEGOTIATED;
|
|
522 |
goto done;
|
|
523 |
}
|
|
524 |
}
|