Mercurial > fife-parpg
annotate ext/openal-soft/Alc/alcRing.c @ 0:4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
author | mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222 |
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date | Sun, 29 Jun 2008 18:44:17 +0000 |
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0
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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1 /** |
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2 * OpenAL cross platform audio library |
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3 * Copyright (C) 1999-2007 by authors. |
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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 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 * Or go to http://www.gnu.org/copyleft/lgpl.html |
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19 */ |
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20 |
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21 #include "config.h" |
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22 |
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23 #include <string.h> |
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24 #include <stdlib.h> |
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25 |
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26 #include "alMain.h" |
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27 |
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28 |
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29 struct RingBuffer { |
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30 ALubyte *mem; |
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31 |
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32 ALsizei frame_size; |
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33 ALsizei length; |
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34 ALint read_pos; |
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35 ALint write_pos; |
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36 |
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37 CRITICAL_SECTION cs; |
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38 }; |
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39 |
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40 |
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41 RingBuffer *CreateRingBuffer(ALsizei frame_size, ALsizei length) |
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42 { |
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43 RingBuffer *ring = calloc(1, sizeof(*ring)); |
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44 if(ring) |
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45 { |
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46 ring->frame_size = frame_size; |
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47 ring->length = length+1; |
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48 ring->write_pos = 1; |
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49 ring->mem = malloc((length+1)*frame_size); |
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50 if(!ring->mem) |
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51 { |
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52 free(ring); |
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53 ring = NULL; |
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54 } |
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55 |
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56 InitializeCriticalSection(&ring->cs); |
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57 } |
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58 return ring; |
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59 } |
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60 |
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61 void DestroyRingBuffer(RingBuffer *ring) |
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62 { |
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63 if(ring) |
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64 { |
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65 DeleteCriticalSection(&ring->cs); |
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66 free(ring->mem); |
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67 free(ring); |
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68 } |
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69 } |
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70 |
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71 ALsizei RingBufferSize(RingBuffer *ring) |
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72 { |
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73 return (ring->write_pos-ring->read_pos-1+ring->length) % ring->length; |
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74 } |
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75 |
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76 void WriteRingBuffer(RingBuffer *ring, const ALubyte *data, ALsizei len) |
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77 { |
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78 int remain = ring->length - ring->write_pos; |
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79 |
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80 EnterCriticalSection(&ring->cs); |
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81 |
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82 if((ring->read_pos-ring->write_pos+ring->length)%ring->length < len) |
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83 ring->read_pos = (ring->write_pos+len) % ring->length; |
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84 |
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85 if(remain < len) |
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86 { |
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87 memcpy(ring->mem+(ring->write_pos*ring->frame_size), data, remain*ring->frame_size); |
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88 memcpy(ring->mem, data+(remain*ring->frame_size), (len-remain)*ring->frame_size); |
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89 } |
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90 else |
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91 memcpy(ring->mem+(ring->write_pos*ring->frame_size), data, len*ring->frame_size); |
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92 |
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93 ring->write_pos += len; |
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94 ring->write_pos %= ring->length; |
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95 |
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96 LeaveCriticalSection(&ring->cs); |
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97 } |
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98 |
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99 void ReadRingBuffer(RingBuffer *ring, ALubyte *data, ALsizei len) |
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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100 { |
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* Datasets becomes the new trunk and retires after that :-)
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101 int remain = ring->length - ring->read_pos; |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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102 |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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103 EnterCriticalSection(&ring->cs); |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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104 |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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105 if(remain < len) |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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106 { |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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107 memcpy(data, ring->mem+(ring->read_pos*ring->frame_size), remain*ring->frame_size); |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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108 memcpy(data+(remain*ring->frame_size), ring->mem, (len-remain)*ring->frame_size); |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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109 } |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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110 else |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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111 memcpy(data, ring->mem+(ring->read_pos*ring->frame_size), len*ring->frame_size); |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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112 |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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113 ring->read_pos += len; |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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114 ring->read_pos %= ring->length; |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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115 |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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116 LeaveCriticalSection(&ring->cs); |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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117 } |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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118 |