1 | //transcode_mualaw.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009 |
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5 | * |
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6 | * This file is part of libroardsp a part of RoarAudio, |
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7 | * a cross-platform sound system for both, home and professional use. |
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8 | * See README for details. |
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9 | * |
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10 | * This file is free software; you can redistribute it and/or modify |
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11 | * it under the terms of the GNU General Public License version 3 |
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12 | * as published by the Free Software Foundation. |
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13 | * |
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14 | * libroardsp is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with this software; see the file COPYING. If not, write to |
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21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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22 | * |
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23 | */ |
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24 | |
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25 | #include "libroardsp.h" |
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26 | |
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27 | #define _CHECK() if ( state == NULL || state->info.pcm.bits != 16 || buf == NULL ) return -1 |
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28 | |
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29 | #define _CHECK_BUF(len) \ |
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30 | void * iobuf; \ |
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31 | size_t outbyte = (len)/2; \ |
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32 | _CHECK(); \ |
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33 | if ( (len) & 0x01 ) return -1; \ |
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34 | if ( provide_buffer(&iobuf, outbyte) == -1 ) \ |
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35 | return -1; |
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36 | |
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37 | #define _SEND_RETURN() if ( roar_vio_write(state->backend, iobuf, outbyte) != outbyte ) \ |
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38 | return -1; \ |
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39 | return 0; |
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40 | |
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41 | #define _READ() if ( roar_vio_read(state->backend, iobuf, outbyte) != outbyte ) \ |
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42 | return -1; |
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43 | |
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44 | static int provide_buffer(void ** buf, size_t len) { |
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45 | static struct roar_buffer * bufbuf = NULL; |
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46 | size_t buflen; |
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47 | |
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48 | if ( bufbuf != NULL ) { |
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49 | if ( roar_buffer_get_len(bufbuf, &buflen) == -1 ) |
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50 | return -1; |
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51 | |
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52 | if ( buflen >= len ) { |
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53 | if ( roar_buffer_get_data(bufbuf, buf) == -1 ) |
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54 | return -1; |
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55 | |
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56 | return 0; |
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57 | } else { |
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58 | if ( roar_buffer_free(bufbuf) == -1 ) |
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59 | return -1; |
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60 | } |
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61 | } |
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62 | |
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63 | if ( roar_buffer_new(&bufbuf, len) == -1 ) |
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64 | return -1; |
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65 | |
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66 | if ( roar_buffer_get_data(bufbuf, buf) == -1 ) |
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67 | return -1; |
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68 | |
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69 | return 0; |
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70 | } |
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71 | |
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72 | int roar_xcoder_alaw_encode(struct roar_xcoder * state, void * buf, size_t len) { |
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73 | _CHECK_BUF(len); |
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74 | |
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75 | if ( roardsp_conv_pcm162alaw(iobuf, buf, outbyte) == -1 ) |
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76 | return -1; |
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77 | |
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78 | _SEND_RETURN(); |
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79 | } |
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80 | |
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81 | int roar_xcoder_alaw_decode(struct roar_xcoder * state, void * buf, size_t len) { |
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82 | _CHECK_BUF(len); |
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83 | |
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84 | _READ(); |
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85 | |
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86 | ROAR_DBG("roar_xcoder_alaw_decode(*): Start decoding.."); |
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87 | |
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88 | if ( roardsp_conv_alaw2pcm16(buf, iobuf, outbyte) == -1 ) |
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89 | return -1; |
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90 | |
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91 | ROAR_DBG("roar_xcoder_alaw_decode(*): Decoding sucessful"); |
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92 | return 0; |
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93 | } |
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94 | |
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95 | int roar_xcoder_mulaw_encode(struct roar_xcoder * state, void * buf, size_t len) { |
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96 | _CHECK_BUF(len); |
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97 | |
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98 | if ( roardsp_conv_pcm162mulaw(iobuf, buf, outbyte) == -1 ) |
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99 | return -1; |
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100 | |
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101 | _SEND_RETURN(); |
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102 | } |
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103 | |
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104 | int roar_xcoder_mulaw_decode(struct roar_xcoder * state, void * buf, size_t len) { |
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105 | _CHECK_BUF(len); |
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106 | |
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107 | _READ(); |
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108 | |
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109 | if ( roardsp_conv_mulaw2pcm16(buf, iobuf, outbyte) == -1 ) |
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110 | return -1; |
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111 | |
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112 | return 0; |
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113 | } |
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114 | |
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115 | //ll |
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