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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13 * |
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14 * 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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17 * Boston, MA 02111-1307, USA. |
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18 */ |
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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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23 */ |
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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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39 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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43 #define GST_ALAW_ENC_USE_TABLE |
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44 |
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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, |
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141 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, |
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142 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, |
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143 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, |
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144 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, |
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145 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, |
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146 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, |
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147 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, |
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148 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, |
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149 0xa7, 0xa7, 0xa7, 0xa7, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, |
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150 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, |
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151 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, |
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152 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, |
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153 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, |
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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, |
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157 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, |
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158 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, 0xa1, |
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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, |
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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, |
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164 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, |
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165 0xa0, 0xa0, 0xa0, 0xa0, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, |
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166 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, |
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167 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, |
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168 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, |
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169 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, |
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170 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa2, 0xa2, 0xa2, 0xa2, |
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171 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, |
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172 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, |
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173 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, |
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174 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, |
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175 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, 0xa2, |
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176 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, |
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177 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, |
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178 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, |
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179 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, 0xad, |
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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 } |
|