1 | //codecfilter_alaw.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008 |
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5 | * |
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6 | * This file is part of roard 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 | * RoarAudio 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 "roard.h" |
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26 | |
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27 | int cf_alaw_open(CODECFILTER_USERDATA_T * inst, int codec, |
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28 | struct roar_stream_server * info, |
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29 | struct roar_codecfilter * filter) { |
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30 | struct roar_stream * s = ROAR_STREAM(info); |
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31 | |
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32 | |
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33 | *inst = (CODECFILTER_USERDATA_T) info; |
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34 | |
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35 | s->info.bits = 16; |
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36 | s->info.codec = ROAR_CODEC_DEFAULT; |
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37 | |
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38 | return 0; |
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39 | } |
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40 | |
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41 | int cf_alaw_close(CODECFILTER_USERDATA_T inst) { |
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42 | return 0; |
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43 | } |
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44 | |
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45 | int cf_alaw_read(CODECFILTER_USERDATA_T inst, char * buf, int len) { |
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46 | struct roar_stream_server * s = ROAR_STREAM_SERVER(inst); |
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47 | |
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48 | if ( (len = stream_vio_s_read(s, buf, len/2)) < 1 ) { |
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49 | return len; |
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50 | } |
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51 | |
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52 | roardsp_conv_alaw2pcm16((int16_t *)buf, buf, len); |
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53 | |
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54 | return len*2; |
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55 | } |
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56 | |
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57 | int cf_alaw_write(CODECFILTER_USERDATA_T inst, char * buf, int len) { |
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58 | struct roar_stream_server * s = ROAR_STREAM_SERVER(inst); |
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59 | char * out; |
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60 | |
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61 | // TODO: add a more effect way to use memory than allways alloc/freeing it. |
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62 | // maybe by keeping a buffer over instanzes or by using ca global buffer |
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63 | // with an refrenze counter so we can free it on last use |
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64 | |
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65 | len /= 2; |
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66 | |
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67 | if ( (out = (char*)malloc(len)) == NULL ) |
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68 | return -1; |
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69 | |
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70 | roardsp_conv_pcm162alaw(out, (int16_t*)buf, len); |
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71 | |
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72 | len = stream_vio_s_write(s, out, len); |
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73 | |
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74 | free(out); |
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75 | |
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76 | if ( len > 0 ) { |
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77 | return len*2; |
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78 | } else { |
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79 | return -1; |
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80 | } |
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81 | } |
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82 | |
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83 | //ll |
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