source: roaraudio/roard/codecfilter_alaw.c @ 4708:c9d40761088a

Last change on this file since 4708:c9d40761088a was 4708:c9d40761088a, checked in by phi, 13 years ago

updated copyright statements

File size: 2.3 KB
Line 
1//codecfilter_alaw.c:
2
3/*
4 *      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2011
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, 51 Franklin Street, Fifth Floor,
22 *  Boston, MA 02110-1301, USA.
23 *
24 */
25
26#include "roard.h"
27
28#ifdef ROAR_SUPPORT_ALAW
29
30int cf_alaw_open(CODECFILTER_USERDATA_T * inst, int codec,
31                                            struct roar_stream_server * info,
32                                            struct roar_codecfilter   * filter) {
33 struct roar_stream * s = ROAR_STREAM(info);
34
35
36 *inst = (CODECFILTER_USERDATA_T) info;
37
38 s->info.bits  = 16;
39 s->info.codec = ROAR_CODEC_DEFAULT;
40
41 return 0;
42}
43
44int cf_alaw_close(CODECFILTER_USERDATA_T   inst) {
45 return 0;
46}
47
48int cf_alaw_read(CODECFILTER_USERDATA_T   inst, char * buf, int len) {
49 struct roar_stream_server * s = ROAR_STREAM_SERVER(inst);
50
51 if ( (len = stream_vio_s_read(s, buf, len/2)) < 1 ) {
52  return len;
53 }
54
55 roardsp_conv_alaw2pcm16((int16_t *)buf, buf, len);
56
57 return len*2;
58}
59
60#ifdef ROAR_SUPPORT_ALAW_RW
61int cf_alaw_write(CODECFILTER_USERDATA_T   inst, char * buf, int len) {
62 struct roar_stream_server * s = ROAR_STREAM_SERVER(inst);
63 char * out;
64
65 // TODO: add a more effect way to use memory than allways alloc/freeing it.
66 //       maybe by keeping a buffer over instanzes or by using ca global buffer
67 //       with an refrenze counter so we can free it on last use
68
69 len /= 2;
70
71 if ( (out = (char*)malloc(len)) == NULL )
72  return -1;
73
74 roardsp_conv_pcm162alaw(out, (int16_t*)buf, len);
75
76 len = stream_vio_s_write(s, out, len);
77
78 free(out);
79
80 if ( len > 0 ) {
81  return len*2;
82 } else {
83  return -1;
84 }
85}
86#endif
87
88#endif
89
90//ll
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