[736] | 1 | //codecfilter_alaw.c: |
---|
| 2 | |
---|
| 3 | /* |
---|
| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008 |
---|
| 5 | * |
---|
| 6 | * This file is part of roard a part of RoarAudio, |
---|
| 7 | * a cross-platform sound system for both, home and professional use. |
---|
| 8 | * See README for details. |
---|
| 9 | * |
---|
| 10 | * This file is free software; you can redistribute it and/or modify |
---|
| 11 | * it under the terms of the GNU General Public License version 3 |
---|
| 12 | * as published by the Free Software Foundation. |
---|
| 13 | * |
---|
| 14 | * RoarAudio is distributed in the hope that it will be useful, |
---|
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
| 17 | * GNU General Public License for more details. |
---|
| 18 | * |
---|
| 19 | * You should have received a copy of the GNU General Public License |
---|
| 20 | * along with this software; see the file COPYING. If not, write to |
---|
| 21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
---|
| 22 | * |
---|
| 23 | */ |
---|
| 24 | |
---|
| 25 | #include "roard.h" |
---|
| 26 | |
---|
[1065] | 27 | #ifdef ROAR_SUPPORT_ALAW |
---|
| 28 | |
---|
[736] | 29 | int cf_alaw_open(CODECFILTER_USERDATA_T * inst, int codec, |
---|
| 30 | struct roar_stream_server * info, |
---|
| 31 | struct roar_codecfilter * filter) { |
---|
| 32 | struct roar_stream * s = ROAR_STREAM(info); |
---|
| 33 | |
---|
| 34 | |
---|
| 35 | *inst = (CODECFILTER_USERDATA_T) info; |
---|
| 36 | |
---|
[738] | 37 | s->info.bits = 16; |
---|
[736] | 38 | s->info.codec = ROAR_CODEC_DEFAULT; |
---|
| 39 | |
---|
| 40 | return 0; |
---|
| 41 | } |
---|
| 42 | |
---|
| 43 | int cf_alaw_close(CODECFILTER_USERDATA_T inst) { |
---|
| 44 | return 0; |
---|
| 45 | } |
---|
| 46 | |
---|
| 47 | int cf_alaw_read(CODECFILTER_USERDATA_T inst, char * buf, int len) { |
---|
| 48 | struct roar_stream_server * s = ROAR_STREAM_SERVER(inst); |
---|
| 49 | |
---|
| 50 | if ( (len = stream_vio_s_read(s, buf, len/2)) < 1 ) { |
---|
| 51 | return len; |
---|
| 52 | } |
---|
| 53 | |
---|
[783] | 54 | roardsp_conv_alaw2pcm16((int16_t *)buf, buf, len); |
---|
[736] | 55 | |
---|
| 56 | return len*2; |
---|
| 57 | } |
---|
| 58 | |
---|
[1065] | 59 | #ifdef ROAR_SUPPORT_ALAW_RW |
---|
[736] | 60 | int cf_alaw_write(CODECFILTER_USERDATA_T inst, char * buf, int len) { |
---|
[818] | 61 | struct roar_stream_server * s = ROAR_STREAM_SERVER(inst); |
---|
| 62 | char * out; |
---|
| 63 | |
---|
| 64 | // TODO: add a more effect way to use memory than allways alloc/freeing it. |
---|
| 65 | // maybe by keeping a buffer over instanzes or by using ca global buffer |
---|
| 66 | // with an refrenze counter so we can free it on last use |
---|
| 67 | |
---|
| 68 | len /= 2; |
---|
| 69 | |
---|
| 70 | if ( (out = (char*)malloc(len)) == NULL ) |
---|
| 71 | return -1; |
---|
[736] | 72 | |
---|
[818] | 73 | roardsp_conv_pcm162alaw(out, (int16_t*)buf, len); |
---|
| 74 | |
---|
| 75 | len = stream_vio_s_write(s, out, len); |
---|
| 76 | |
---|
| 77 | free(out); |
---|
| 78 | |
---|
| 79 | if ( len > 0 ) { |
---|
| 80 | return len*2; |
---|
| 81 | } else { |
---|
| 82 | return -1; |
---|
| 83 | } |
---|
[736] | 84 | } |
---|
[1065] | 85 | #endif |
---|
| 86 | |
---|
| 87 | #endif |
---|
[736] | 88 | |
---|
[1144] | 89 | #if defined(ROAR_SUPPORT_ALAW) || defined(ROAR_SUPPORT_MULAW) |
---|
| 90 | int cf_alaw_delay(CODECFILTER_USERDATA_T inst, uint_least32_t * delay) { |
---|
| 91 | // this codec does not create any addition latency. |
---|
| 92 | |
---|
| 93 | *delay = 0; |
---|
| 94 | return 0; |
---|
| 95 | } |
---|
| 96 | #endif |
---|
| 97 | |
---|
[736] | 98 | //ll |
---|