[2179] | 1 | //transcode_mualaw.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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[2181] | 27 | #define _CHECK() if ( state == NULL || state->info.pcm.bits != 16 || buf == NULL ) return -1 |
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| 28 | |
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| 29 | #define _CHECK_BUF(len) \ |
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| 30 | void * iobuf; \ |
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| 31 | size_t outbyte = (len)/2; \ |
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| 32 | _CHECK(); \ |
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| 33 | if ( (len) & 0x01 ) return -1; \ |
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| 34 | if ( provide_buffer(&iobuf, outbyte) == -1 ) \ |
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| 35 | return -1; |
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| 36 | |
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| 37 | #define _SEND_RETURN() if ( roar_vio_write(state->backend, iobuf, outbyte) != outbyte ) \ |
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| 38 | return -1; \ |
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| 39 | return 0; |
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| 40 | |
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| 41 | #define _READ() if ( roar_vio_read(state->backend, iobuf, outbyte) != outbyte ) \ |
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| 42 | return -1; |
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| 43 | |
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| 44 | static int provide_buffer(void ** buf, size_t len) { |
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| 45 | static struct roar_buffer * bufbuf = NULL; |
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[2179] | 46 | return -1; |
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| 47 | } |
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| 48 | |
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[2181] | 49 | int roar_xcoder_alaw_encode(struct roar_xcoder * state, void * buf, size_t len) { |
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| 50 | _CHECK_BUF(len); |
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| 51 | |
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| 52 | if ( roardsp_conv_pcm162alaw(iobuf, buf, outbyte) == -1 ) |
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| 53 | return -1; |
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| 54 | |
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| 55 | _SEND_RETURN(); |
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| 56 | } |
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| 57 | |
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[2179] | 58 | int roar_xcoder_alaw_decode(struct roar_xcoder * state, void * buf, size_t len) { |
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[2181] | 59 | _CHECK_BUF(len); |
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| 60 | |
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| 61 | _READ(); |
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| 62 | |
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| 63 | if ( roardsp_conv_alaw2pcm16(buf, iobuf, outbyte) == -1 ) |
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| 64 | return -1; |
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| 65 | |
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| 66 | return 0; |
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[2179] | 67 | } |
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| 68 | |
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| 69 | int roar_xcoder_mulaw_encode(struct roar_xcoder * state, void * buf, size_t len) { |
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[2181] | 70 | _CHECK_BUF(len); |
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| 71 | |
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| 72 | if ( roardsp_conv_pcm162mulaw(iobuf, buf, outbyte) == -1 ) |
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| 73 | return -1; |
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| 74 | |
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| 75 | _SEND_RETURN(); |
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[2179] | 76 | } |
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| 77 | |
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| 78 | int roar_xcoder_mulaw_decode(struct roar_xcoder * state, void * buf, size_t len) { |
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[2181] | 79 | _CHECK_BUF(len); |
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| 80 | |
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| 81 | _READ(); |
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| 82 | |
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| 83 | if ( roardsp_conv_mulaw2pcm16(buf, iobuf, outbyte) == -1 ) |
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| 84 | return -1; |
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| 85 | |
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| 86 | return 0; |
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[2179] | 87 | } |
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| 88 | |
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| 89 | //ll |
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