1 | //transcode.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 _FUNC(func) (state->entry->func) |
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28 | #define _CHECK_STATE() (!(state == NULL || state->entry == NULL)) |
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29 | #define _CHECK_FUNC(func) (_CHECK_STATE() && _FUNC(func) != NULL) |
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30 | #define _CHECK_BASIC(func) if ( !_CHECK_FUNC(func) ) return -1 |
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31 | #define _CHECK() if ( !_CHECK_STATE() ) return -1 |
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32 | |
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33 | static struct roar_xcoder_entry g_xcoders[] = { |
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34 | {ROAR_CODEC_ALAW, roar_xcoder_dummy_inituninit, roar_xcoder_dummy_inituninit, roar_xcoder_dummy_packet_size_any, |
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35 | roar_xcoder_alaw_encode, roar_xcoder_alaw_decode}, |
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36 | {ROAR_CODEC_MULAW, roar_xcoder_dummy_inituninit, roar_xcoder_dummy_inituninit, roar_xcoder_dummy_packet_size_any, |
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37 | roar_xcoder_mulaw_encode, roar_xcoder_mulaw_decode}, |
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38 | {-1, NULL, NULL, NULL, NULL, NULL} |
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39 | }; |
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40 | |
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41 | int roar_xcoder_init(struct roar_xcoder * state, int encoder, struct roar_audio_info * info, struct roar_vio_calls * vio) { |
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42 | int i; |
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43 | |
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44 | if ( state == NULL || info == NULL ) |
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45 | return -1; |
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46 | |
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47 | memset(state, 0, sizeof(struct roar_xcoder)); |
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48 | |
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49 | for (i = 0; g_xcoders[i].codec != -1; i++) { |
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50 | if ( g_xcoders[i].codec == info->codec ) { |
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51 | state->entry = &(g_xcoders[i]); |
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52 | break; |
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53 | } |
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54 | } |
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55 | |
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56 | if ( state->entry == NULL ) |
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57 | return -1; |
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58 | |
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59 | state->stage = ROAR_XCODER_STAGE_NONE; |
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60 | state->encode = encoder; |
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61 | state->packet_len = -1; |
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62 | |
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63 | if ( roar_xcoder_set_backend(state, vio) == -1 ) |
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64 | return -1; |
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65 | |
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66 | memcpy(&(state->info.coded), info, sizeof(struct roar_audio_info)); |
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67 | memcpy(&(state->info.pcm ), info, sizeof(struct roar_audio_info)); |
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68 | |
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69 | state->info.pcm.codec = ROAR_CODEC_DEFAULT; |
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70 | |
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71 | if ( _FUNC(init) == NULL ) |
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72 | return -1; |
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73 | |
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74 | if ( _FUNC(init)(state) != 0 ) |
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75 | return -1; |
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76 | |
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77 | state->stage = ROAR_XCODER_STAGE_INITED; |
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78 | |
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79 | return 0; |
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80 | } |
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81 | |
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82 | int roar_xcoder_set_backend(struct roar_xcoder * state, struct roar_vio_calls * vio) { |
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83 | _CHECK(); |
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84 | |
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85 | if ( vio == NULL && state->backend != NULL ) |
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86 | return -1; |
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87 | |
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88 | state->backend = vio; |
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89 | |
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90 | return 0; |
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91 | } |
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92 | int roar_xcoder_packet_size(struct roar_xcoder * state, int samples) { |
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93 | _CHECK_BASIC(packet_size); |
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94 | |
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95 | state->packet_len = state->entry->packet_size(state, samples); |
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96 | |
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97 | if ( state->packet_len == 0 ) { |
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98 | if ( samples < 1 ) { |
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99 | return ROAR_RATE_DEFAULT/100; |
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100 | } else { |
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101 | return samples; |
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102 | } |
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103 | } |
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104 | |
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105 | return state->packet_len; |
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106 | } |
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107 | |
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108 | int roar_xcoder_close (struct roar_xcoder * state) { |
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109 | _CHECK_BASIC(uninit); |
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110 | |
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111 | |
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112 | if ( state->iobuffer != NULL ) { |
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113 | roar_xcoder_proc(state, NULL, 0); // try to flush |
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114 | roar_buffer_free(state->iobuffer); |
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115 | } |
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116 | |
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117 | return _FUNC(uninit)(state); |
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118 | } |
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119 | |
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120 | int roar_xcoder_proc_packet(struct roar_xcoder * state, void * buf, size_t len) { |
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121 | _CHECK(); |
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122 | |
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123 | if ( state->backend == NULL ) |
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124 | return -1; |
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125 | |
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126 | if ( state->packet_len > 0 && state->packet_len != len ) |
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127 | return -1; |
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128 | |
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129 | if ( state->encode ) { |
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130 | _CHECK_BASIC(encode); |
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131 | return _FUNC(encode)(state, buf, len); |
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132 | } else { |
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133 | _CHECK_BASIC(decode); |
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134 | return _FUNC(decode)(state, buf, len); |
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135 | } |
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136 | } |
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137 | |
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138 | int roar_xcoder_proc (struct roar_xcoder * state, void * buf, size_t len) { |
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139 | return -1; |
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140 | } |
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141 | |
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142 | int roar_bixcoder_init(struct roar_bixcoder * state, struct roar_audio_info * info, struct roar_vio_calls * vio) { |
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143 | if ( state == NULL || info == NULL || vio == NULL ) |
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144 | return -1; |
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145 | |
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146 | memset(state, 0, sizeof(struct roar_bixcoder)); |
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147 | |
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148 | if ( roar_xcoder_init(&(state->encoder), 1, info, vio) == -1 ) |
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149 | return -1; |
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150 | |
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151 | if ( roar_xcoder_init(&(state->decoder), 0, info, vio) == -1 ) { |
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152 | roar_xcoder_close(&(state->encoder)); |
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153 | return -1; |
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154 | } |
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155 | |
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156 | return 0; |
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157 | } |
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158 | |
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159 | int roar_bixcoder_packet_size (struct roar_bixcoder * state, int samples) { |
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160 | int ret; |
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161 | |
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162 | if ( state == NULL ) |
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163 | return -1; |
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164 | |
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165 | if ( (ret = roar_xcoder_packet_size(&(state->encoder), samples)) == -1 ) |
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166 | return -1; |
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167 | |
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168 | if ( roar_xcoder_packet_size(&(state->decoder), ret) != ret ) |
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169 | return -1; |
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170 | |
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171 | return ret; |
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172 | } |
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173 | |
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174 | int roar_bixcoder_close (struct roar_bixcoder * state) { |
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175 | int ret = 0; |
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176 | |
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177 | if ( state == NULL ) |
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178 | return -1; |
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179 | |
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180 | ret = roar_xcoder_close(&(state->encoder)); |
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181 | |
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182 | if ( roar_xcoder_close(&(state->decoder)) == -1 ) |
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183 | return -1; |
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184 | |
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185 | return ret; |
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186 | } |
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187 | |
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188 | int roar_bixcoder_read_packet (struct roar_bixcoder * state, void * buf, size_t len) { |
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189 | if ( state == NULL ) |
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190 | return -1; |
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191 | |
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192 | return roar_xcoder_proc_packet(&(state->decoder), buf, len); |
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193 | } |
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194 | |
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195 | int roar_bixcoder_read (struct roar_bixcoder * state, void * buf, size_t len) { |
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196 | if ( state == NULL ) |
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197 | return -1; |
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198 | |
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199 | return roar_xcoder_proc(&(state->decoder), buf, len); |
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200 | } |
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201 | |
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202 | int roar_bixcoder_write_packet(struct roar_bixcoder * state, void * buf, size_t len) { |
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203 | if ( state == NULL ) |
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204 | return -1; |
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205 | |
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206 | return roar_xcoder_proc_packet(&(state->encoder), buf, len); |
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207 | } |
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208 | |
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209 | int roar_bixcoder_write (struct roar_bixcoder * state, void * buf, size_t len) { |
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210 | if ( state == NULL ) |
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211 | return -1; |
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212 | |
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213 | return roar_xcoder_proc(&(state->encoder), buf, len); |
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214 | } |
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215 | |
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216 | // dummy functions used by some de/encoders: |
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217 | int roar_xcoder_dummy_inituninit(struct roar_xcoder * state) { |
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218 | return 0; |
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219 | } |
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220 | |
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221 | int roar_xcoder_dummy_packet_size_any(struct roar_xcoder * state, int samples) { |
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222 | // the case samples=-1/samples!=-1 based things are done in the general func |
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223 | return 0; |
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224 | } |
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225 | |
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226 | //ll |
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