1 | //transcode_celt.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 | #ifdef ROAR_HAVE_LIBCELT |
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28 | |
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29 | #define _16BIT (16/8) |
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30 | #define _SIZE_LEN 2 |
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31 | |
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32 | int roar_xcoder_celt_init (struct roar_xcoder * state) { |
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33 | struct roar_xcoder_celt * self = malloc(sizeof(struct roar_xcoder_celt)); |
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34 | struct roar_audio_info * info = &(state->info.pcm); |
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35 | |
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36 | if ( self == NULL ) |
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37 | return -1; |
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38 | |
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39 | // curruntly only 16 bit mode is supported |
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40 | if ( info->bits != 16 ) { |
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41 | free(self); |
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42 | return -1; |
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43 | } |
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44 | |
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45 | memset(self, 0, sizeof(struct roar_xcoder_celt)); |
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46 | |
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47 | state->inst = self; |
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48 | |
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49 | self->frame_size = 256; |
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50 | |
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51 | self->bufferlen = info->channels * 32 + _SIZE_LEN; |
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52 | self->iobuffer = malloc(self->bufferlen); |
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53 | |
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54 | if ( self->iobuffer == NULL ) { |
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55 | free(self); |
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56 | return -1; |
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57 | } |
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58 | |
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59 | self->mode = celt_mode_create(info->rate, info->channels, self->frame_size, NULL); |
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60 | |
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61 | if ( self->mode == NULL ) { |
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62 | free(self); |
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63 | return -1; |
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64 | } |
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65 | |
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66 | if (state->encode) { |
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67 | self->encoder = celt_encoder_create(self->mode); |
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68 | if ( self->encoder == NULL ) { |
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69 | roar_xcoder_celt_uninit(state); |
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70 | return -1; |
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71 | } |
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72 | } else { |
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73 | self->decoder = celt_decoder_create(self->mode); |
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74 | if ( self->decoder == NULL ) { |
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75 | roar_xcoder_celt_uninit(state); |
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76 | return -1; |
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77 | } |
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78 | } |
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79 | |
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80 | ROAR_DBG("roar_xcoder_celt_init(*) = 0"); |
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81 | |
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82 | return 0; |
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83 | } |
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84 | |
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85 | int roar_xcoder_celt_uninit (struct roar_xcoder * state) { |
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86 | struct roar_xcoder_celt * self = state->inst; |
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87 | |
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88 | if ( self->iobuffer ) |
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89 | free(self->iobuffer); |
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90 | |
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91 | if ( self->encoder ) |
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92 | celt_encoder_destroy(self->encoder); |
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93 | |
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94 | if ( self->decoder ) |
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95 | celt_decoder_destroy(self->decoder); |
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96 | |
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97 | if ( self->mode ) |
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98 | celt_mode_destroy(self->mode); |
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99 | |
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100 | free(self); |
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101 | |
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102 | ROAR_DBG("roar_xcoder_celt_uninit(*) = 0"); |
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103 | |
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104 | return 0; |
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105 | } |
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106 | |
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107 | int roar_xcoder_celt_packet_size(struct roar_xcoder * state, int samples) { |
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108 | struct roar_xcoder_celt * self = state->inst; |
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109 | register int ret = self->frame_size * _16BIT * state->info.pcm.channels; |
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110 | |
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111 | ROAR_DBG("roar_xcoder_celt_packet_size(state=%p, samples=%i) = %i", state, samples, ret); |
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112 | |
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113 | return ret; |
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114 | } |
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115 | |
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116 | int roar_xcoder_celt_encode (struct roar_xcoder * state, void * buf, size_t len) { |
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117 | struct roar_xcoder_celt * self = state->inst; |
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118 | uint16_t * lenp = self->iobuffer; |
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119 | void * cp = self->iobuffer + _SIZE_LEN; |
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120 | uint16_t pkglen; |
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121 | |
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122 | ROAR_DBG("roar_xcoder_celt_encode(*): test if we are in encoding mode..."); |
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123 | |
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124 | if (!state->encode) |
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125 | return -1; |
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126 | |
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127 | ROAR_DBG("roar_xcoder_celt_encode(*): Encoding..."); |
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128 | |
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129 | if ( state->stage == ROAR_XCODER_STAGE_INITED ) { |
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130 | if ( roar_vio_write(state->backend, ROAR_CELT_MAGIC, ROAR_CELT_MAGIC_LEN) != ROAR_CELT_MAGIC_LEN ) |
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131 | return -1; |
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132 | state->stage = ROAR_XCODER_STAGE_MAGIC; |
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133 | ROAR_DBG("roar_xcoder_celt_encode(*): Wrote MAGIC"); |
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134 | } |
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135 | |
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136 | pkglen = celt_encode(self->encoder, (celt_int16_t *) buf, NULL, cp, self->bufferlen - _SIZE_LEN); |
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137 | *lenp = ROAR_HOST2NET16(pkglen); |
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138 | |
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139 | if ( roar_vio_write(state->backend, self->iobuffer, pkglen+2) == -1 ) |
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140 | return -1; |
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141 | |
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142 | return 0; |
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143 | } |
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144 | |
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145 | int roar_xcoder_celt_decode (struct roar_xcoder * state, void * buf, size_t len) { |
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146 | struct roar_xcoder_celt * self = state->inst; |
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147 | uint16_t * lenp = self->iobuffer; |
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148 | void * cp = self->iobuffer + _SIZE_LEN; |
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149 | uint16_t pkglen; |
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150 | char magic[ROAR_CELT_MAGIC_LEN]; |
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151 | |
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152 | ROAR_DBG("roar_xcoder_celt_decode(*): test if we are in decoding mode..."); |
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153 | |
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154 | if (state->encode) |
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155 | return -1; |
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156 | |
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157 | if ( state->stage == ROAR_XCODER_STAGE_INITED ) { |
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158 | if ( roar_vio_read(state->backend, magic, ROAR_CELT_MAGIC_LEN) != ROAR_CELT_MAGIC_LEN ) |
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159 | return -1; |
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160 | |
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161 | if ( memcmp(magic, ROAR_CELT_MAGIC, ROAR_CELT_MAGIC_LEN) != 0 ) |
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162 | return -1; |
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163 | |
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164 | state->stage = ROAR_XCODER_STAGE_MAGIC; |
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165 | ROAR_DBG("roar_xcoder_celt_decode(*): Found valid Magic"); |
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166 | } |
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167 | |
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168 | if ( roar_vio_read(state->backend, lenp, _SIZE_LEN) != _SIZE_LEN ) |
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169 | return -1; |
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170 | |
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171 | pkglen = ROAR_NET2HOST16(*lenp); |
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172 | |
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173 | if ( pkglen > (self->bufferlen - _SIZE_LEN) ) |
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174 | return -1; |
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175 | |
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176 | if ( roar_vio_read(state->backend, cp, pkglen) != pkglen ) |
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177 | return -1; |
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178 | |
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179 | if ( celt_decode(self->decoder, cp, pkglen, (celt_int16_t *) buf) < 0 ) |
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180 | return -1; |
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181 | |
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182 | return 0; |
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183 | } |
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184 | |
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185 | #endif |
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186 | |
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187 | //ll |
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