[736] | 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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[3517] | 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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[736] | 23 | * |
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| 24 | */ |
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| 25 | |
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| 26 | #include "roard.h" |
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| 27 | |
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[1065] | 28 | #ifdef ROAR_SUPPORT_ALAW |
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| 29 | |
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[736] | 30 | int cf_alaw_open(CODECFILTER_USERDATA_T * inst, int codec, |
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| 31 | struct roar_stream_server * info, |
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| 32 | struct roar_codecfilter * filter) { |
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| 33 | struct roar_stream * s = ROAR_STREAM(info); |
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| 34 | |
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| 35 | |
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| 36 | *inst = (CODECFILTER_USERDATA_T) info; |
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| 37 | |
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[738] | 38 | s->info.bits = 16; |
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[736] | 39 | s->info.codec = ROAR_CODEC_DEFAULT; |
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| 40 | |
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| 41 | return 0; |
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| 42 | } |
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| 43 | |
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| 44 | int cf_alaw_close(CODECFILTER_USERDATA_T inst) { |
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| 45 | return 0; |
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| 46 | } |
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| 47 | |
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| 48 | int cf_alaw_read(CODECFILTER_USERDATA_T inst, char * buf, int len) { |
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| 49 | struct roar_stream_server * s = ROAR_STREAM_SERVER(inst); |
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| 50 | |
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| 51 | if ( (len = stream_vio_s_read(s, buf, len/2)) < 1 ) { |
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| 52 | return len; |
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| 53 | } |
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| 54 | |
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[783] | 55 | roardsp_conv_alaw2pcm16((int16_t *)buf, buf, len); |
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[736] | 56 | |
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| 57 | return len*2; |
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| 58 | } |
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| 59 | |
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[1065] | 60 | #ifdef ROAR_SUPPORT_ALAW_RW |
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[736] | 61 | int cf_alaw_write(CODECFILTER_USERDATA_T inst, char * buf, int len) { |
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[818] | 62 | struct roar_stream_server * s = ROAR_STREAM_SERVER(inst); |
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| 63 | char * out; |
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| 64 | |
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| 65 | // TODO: add a more effect way to use memory than allways alloc/freeing it. |
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| 66 | // maybe by keeping a buffer over instanzes or by using ca global buffer |
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| 67 | // with an refrenze counter so we can free it on last use |
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| 68 | |
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| 69 | len /= 2; |
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| 70 | |
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| 71 | if ( (out = (char*)malloc(len)) == NULL ) |
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| 72 | return -1; |
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[736] | 73 | |
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[818] | 74 | roardsp_conv_pcm162alaw(out, (int16_t*)buf, len); |
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| 75 | |
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| 76 | len = stream_vio_s_write(s, out, len); |
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| 77 | |
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| 78 | free(out); |
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| 79 | |
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| 80 | if ( len > 0 ) { |
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| 81 | return len*2; |
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| 82 | } else { |
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| 83 | return -1; |
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| 84 | } |
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[736] | 85 | } |
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[1065] | 86 | #endif |
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| 87 | |
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| 88 | #endif |
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[736] | 89 | |
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[1144] | 90 | #if defined(ROAR_SUPPORT_ALAW) || defined(ROAR_SUPPORT_MULAW) |
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| 91 | int cf_alaw_delay(CODECFILTER_USERDATA_T inst, uint_least32_t * delay) { |
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| 92 | // this codec does not create any addition latency. |
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| 93 | |
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| 94 | *delay = 0; |
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| 95 | return 0; |
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| 96 | } |
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| 97 | #endif |
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| 98 | |
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[736] | 99 | //ll |
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