[3969] | 1 | //vio_buffer.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010 |
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| 5 | * |
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| 6 | * This file is part of libroar 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 | * libroar 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, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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| 23 | * |
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| 24 | * NOTE for everyone want's to change something and send patches: |
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| 25 | * read README and HACKING! There a addition information on |
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| 26 | * the license of this document you need to read before you send |
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| 27 | * any patches. |
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| 28 | * |
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| 29 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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| 30 | * or libpulse*: |
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| 31 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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| 32 | * and are therefore GPL. Because of this it may be illigal to use |
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| 33 | * them with any software that uses libesd, libartsc or libpulse*. |
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| 34 | */ |
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| 35 | |
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| 36 | #include "libroar.h" |
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| 37 | |
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[3971] | 38 | int roar_vio_open_buffer (struct roar_vio_calls * calls, struct roar_vio_calls * dst, ssize_t minsize, int use_re) { |
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| 39 | struct roar_vio_buffer * self;; |
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| 40 | |
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| 41 | if ( calls == NULL || dst == NULL ) |
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| 42 | return -1; |
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| 43 | |
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| 44 | if ( (self = roar_mm_malloc(sizeof(struct roar_vio_buffer))) == NULL ) |
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| 45 | return -1; |
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| 46 | |
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| 47 | memset(self, 0, sizeof(struct roar_vio_buffer)); |
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| 48 | |
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| 49 | self->backend = dst; |
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| 50 | self->min_bufsize = minsize; |
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| 51 | self->use_re = use_re; |
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| 52 | |
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| 53 | if ( use_re ) { |
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| 54 | if ( roar_vio_open_re(&(self->re_vio), dst) == -1 ) { |
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| 55 | roar_mm_free(self); |
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| 56 | return -1; |
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| 57 | } |
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| 58 | } |
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| 59 | |
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| 60 | memset(calls, 0, sizeof(struct roar_vio_calls)); |
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| 61 | |
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| 62 | calls->inst = self; |
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| 63 | calls->close = roar_vio_buffer_close; |
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| 64 | calls->write = roar_vio_buffer_write; |
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| 65 | calls->nonblock = roar_vio_buffer_nonblock; |
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| 66 | calls->ctl = roar_vio_buffer_ctl; |
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| 67 | calls->sync = roar_vio_buffer_sync; |
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| 68 | calls->lseek = roar_vio_buffer_lseek; |
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| 69 | |
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| 70 | return 0; |
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| 71 | } |
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| 72 | |
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| 73 | int roar_vio_buffer_close (struct roar_vio_calls * vio) { |
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| 74 | struct roar_vio_buffer * self = vio->inst; |
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| 75 | int ret; |
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| 76 | |
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| 77 | if ( self->buf_old != NULL ) |
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| 78 | roar_buffer_free(self->buf_old); |
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| 79 | |
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| 80 | if ( self->buf_cur != NULL ) |
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| 81 | roar_buffer_free(self->buf_cur); |
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| 82 | |
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| 83 | if ( self->use_re ) { |
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| 84 | ret = roar_vio_close(&(self->re_vio)); |
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| 85 | } else { |
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| 86 | ret = roar_vio_close(self->backend); |
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| 87 | } |
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| 88 | |
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| 89 | roar_mm_free(self); |
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| 90 | |
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| 91 | return ret; |
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| 92 | } |
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| 93 | |
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[3972] | 94 | ssize_t roar_vio_buffer_read (struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 95 | struct roar_vio_buffer * self = vio->inst; |
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| 96 | size_t havelen; |
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| 97 | size_t buflen; |
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[4535] | 98 | ssize_t ret; |
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[3972] | 99 | |
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| 100 | if ( count == 0 ) |
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| 101 | return 0; |
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| 102 | |
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| 103 | if ( buf == NULL ) |
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| 104 | return -1; |
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| 105 | |
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| 106 | if ( self->offset.is_old ) { |
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| 107 | havelen = (self->len_old + self->len_cur) - self->offset.offset; |
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| 108 | } else { |
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| 109 | havelen = self->len_cur - self->offset.offset; |
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| 110 | } |
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| 111 | |
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| 112 | if ( havelen == 0 ) { |
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[4535] | 113 | if ( self->use_re ) { |
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| 114 | ret = roar_vio_read(&(self->re_vio), buf, count); |
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| 115 | } else { |
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| 116 | ret = roar_vio_read(self->backend, buf, count); |
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| 117 | } |
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| 118 | // TODO... |
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| 119 | return ret; |
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[3972] | 120 | } else if ( count == havelen ) { |
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| 121 | if (self->offset.is_old) { |
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| 122 | buflen = count; |
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| 123 | if ( roar_buffer_shift_out(&(self->buf_old), buf, &buflen) == -1 ) |
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| 124 | return -1; |
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| 125 | |
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| 126 | if ( self->buf_old != NULL ) // strange error |
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| 127 | return buflen; |
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| 128 | |
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| 129 | buf += buflen; |
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| 130 | count -= buflen; |
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| 131 | |
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| 132 | self->len_old = 0; |
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| 133 | self->offset.is_old = 0; |
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| 134 | self->offset.offset = 0; |
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| 135 | } |
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| 136 | |
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| 137 | return -1; |
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| 138 | |
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| 139 | } else if ( count < havelen ) { |
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| 140 | } else if ( count > havelen ) { |
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| 141 | } |
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| 142 | |
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| 143 | return -1; |
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| 144 | } |
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[3971] | 145 | |
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| 146 | int roar_vio_buffer_sync (struct roar_vio_calls * vio) { |
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| 147 | struct roar_vio_buffer * self = vio->inst; |
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| 148 | struct roar_vio_calls * backend; |
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| 149 | off_t dst = 0; |
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| 150 | |
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| 151 | if ( self->use_re ) { |
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| 152 | backend = &(self->re_vio); |
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| 153 | } else { |
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| 154 | backend = self->backend; |
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| 155 | } |
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| 156 | |
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| 157 | // bring backend in sync state, if this fails we do not need to continue... |
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| 158 | if ( self->use_re ) { |
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| 159 | if ( roar_vio_sync(backend) == -1 ) |
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| 160 | return -1; |
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| 161 | } else { |
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| 162 | if ( roar_vio_sync(backend) == -1 ) |
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| 163 | return -1; |
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| 164 | } |
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| 165 | |
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| 166 | if ( self->buf_old == NULL && self->buf_cur == NULL ) |
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| 167 | return 0; // we are in sync in case no buffers are currently used. |
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| 168 | |
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| 169 | if (self->buf_old != NULL && self->buf_cur == NULL ) { |
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| 170 | // we just finished the segment |
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| 171 | roar_buffer_free(self->buf_old); |
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| 172 | return 0; |
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| 173 | } |
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| 174 | |
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| 175 | // calc seek pos: |
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| 176 | if ( self->offset.is_old ) { |
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| 177 | dst = (self->len_cur + self->len_old) - self->offset.offset; |
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| 178 | } else { |
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| 179 | dst = self->len_cur - self->offset.offset; |
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| 180 | } |
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| 181 | |
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| 182 | dst = -dst; |
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| 183 | |
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| 184 | // do the seek: |
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| 185 | if ( roar_vio_lseek(backend, dst, SEEK_CUR) == (off_t)-1 ) |
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| 186 | return -1; |
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| 187 | |
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| 188 | // free all internal buffers: |
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| 189 | if ( self->buf_old != NULL ) |
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| 190 | roar_buffer_free(self->buf_old); |
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| 191 | |
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| 192 | if ( self->buf_cur != NULL ) |
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| 193 | roar_buffer_free(self->buf_cur); |
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| 194 | |
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| 195 | self->offset.is_old = 0; |
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| 196 | self->offset.offset = 0; |
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| 197 | |
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| 198 | // funally bring the backend in sync state again, to be sure all changes are done. |
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| 199 | if ( self->use_re ) { |
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| 200 | if ( roar_vio_sync(backend) == -1 ) |
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| 201 | return -1; |
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| 202 | } else { |
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| 203 | if ( roar_vio_sync(backend) == -1 ) |
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| 204 | return -1; |
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| 205 | } |
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| 206 | |
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| 207 | return 0; |
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| 208 | } |
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| 209 | |
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| 210 | off_t roar_vio_buffer_lseek (struct roar_vio_calls * vio, off_t offset, int whence) { |
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| 211 | struct roar_vio_buffer * self = vio->inst; |
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| 212 | size_t newoff; |
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| 213 | off_t ret; |
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| 214 | off_t invoff; |
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| 215 | |
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| 216 | // in-memory seeking is only supported for SEEK_CUR: |
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| 217 | if ( whence == SEEK_CUR ) { |
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| 218 | if ( offset == 0 ) { |
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| 219 | return 0; |
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| 220 | } else if ( offset > 0 ) { |
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| 221 | newoff = self->offset.offset + offset; |
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| 222 | |
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| 223 | if ( self->offset.is_old ) { |
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| 224 | if ( newoff == self->len_old ) { |
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| 225 | self->offset.is_old = 0; |
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| 226 | self->offset.offset = 0; |
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| 227 | self->abspos += offset; |
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| 228 | return self->abspos; |
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| 229 | } else if ( newoff < self->len_old ) { |
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| 230 | self->offset.offset = newoff; |
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| 231 | self->abspos += offset; |
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| 232 | return self->abspos; |
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| 233 | } else if ( newoff > self->len_old ) { |
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| 234 | if ( newoff < (self->len_old + self->len_cur ) ) { |
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| 235 | self->offset.is_old = 0; |
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| 236 | self->offset.offset = offset + self->offset.offset - self->len_old; |
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| 237 | self->abspos += offset; |
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| 238 | return self->abspos; |
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| 239 | } |
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| 240 | } |
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| 241 | } else { |
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| 242 | if ( newoff == self->len_cur ) { |
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| 243 | roar_buffer_free(self->buf_old); |
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| 244 | self->buf_old = self->buf_cur; |
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| 245 | self->buf_cur = NULL; |
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| 246 | self->offset.offset = 0; |
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| 247 | self->abspos += offset; |
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| 248 | return self->abspos; |
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| 249 | } else if ( newoff < self->len_cur ) { |
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| 250 | self->offset.offset = newoff; |
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| 251 | self->abspos += offset; |
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| 252 | return self->abspos; |
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| 253 | } |
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| 254 | } |
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| 255 | } else { |
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| 256 | invoff = -offset; |
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| 257 | |
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| 258 | if ( invoff <= self->offset.offset ) { |
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| 259 | self->offset.offset = 0; |
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| 260 | self->abspos -= invoff; |
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| 261 | return self->abspos; |
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| 262 | } |
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| 263 | |
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| 264 | if ( !self->offset.is_old ) { |
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| 265 | if ( invoff > self->offset.offset ) { |
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| 266 | if ( invoff <= (self->len_old + self->offset.offset) ) { |
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| 267 | self->offset.is_old = 1; |
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| 268 | self->offset.offset = (self->len_old + self->offset.offset) - invoff; |
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| 269 | self->abspos -= invoff; |
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| 270 | return self->abspos; |
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| 271 | } |
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| 272 | } |
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| 273 | } |
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| 274 | } |
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| 275 | } |
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| 276 | |
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| 277 | // we need to do a physical seek; |
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| 278 | // get in sync with current possition, flush all buffers,... |
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| 279 | if ( roar_vio_buffer_sync(vio) == -1 ) |
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| 280 | return -1; |
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| 281 | |
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| 282 | // do the seek: |
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| 283 | if ( self->use_re ) { |
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| 284 | ret = roar_vio_lseek(&(self->re_vio), offset, whence); |
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| 285 | } else { |
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| 286 | ret = roar_vio_lseek(self->backend, offset, whence); |
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| 287 | } |
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| 288 | |
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| 289 | if (ret != (off_t)-1) |
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| 290 | self->abspos = ret; |
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| 291 | |
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| 292 | return ret; |
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| 293 | } |
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| 294 | |
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| 295 | int roar_vio_buffer_ctl (struct roar_vio_calls * vio, int cmd, void * data) { |
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| 296 | struct roar_vio_buffer * self; |
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| 297 | |
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| 298 | if (vio == NULL || cmd == -1) |
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| 299 | return -1; |
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| 300 | |
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| 301 | ROAR_DBG("roar_vio_buffer_ctl(vio=%p, cmd=0x%.8x, data=%p) = ?", vio, cmd, data); |
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| 302 | |
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| 303 | self = vio->inst; |
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| 304 | |
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| 305 | switch (cmd) { |
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| 306 | case ROAR_VIO_CTL_GET_NAME: |
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| 307 | if ( data == NULL ) |
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| 308 | return -1; |
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| 309 | |
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| 310 | *(char**)data = "buffer"; |
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| 311 | return 0; |
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| 312 | break; |
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| 313 | case ROAR_VIO_CTL_GET_NEXT: |
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| 314 | if ( self->use_re ) { |
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| 315 | *(struct roar_vio_calls **)data = &(self->re_vio); |
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| 316 | } else { |
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| 317 | *(struct roar_vio_calls **)data = self->backend; |
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| 318 | } |
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| 319 | return 0; |
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| 320 | break; |
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| 321 | case ROAR_VIO_CTL_SET_NEXT: |
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| 322 | if ( self->use_re ) { |
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| 323 | return roar_vio_ctl(&(self->re_vio), ROAR_VIO_CTL_SET_NEXT, data); |
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| 324 | } else { |
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| 325 | self->backend = *(struct roar_vio_calls **)data; |
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| 326 | } |
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| 327 | return 0; |
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| 328 | break; |
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| 329 | } |
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| 330 | |
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| 331 | return roar_vio_ctl((struct roar_vio_calls *) vio->inst, cmd, data); |
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| 332 | } |
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| 333 | |
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| 334 | ssize_t roar_vio_buffer_write (struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 335 | struct roar_vio_buffer * self = vio->inst; |
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| 336 | |
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| 337 | if ( self->use_re ) { |
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| 338 | return roar_vio_write(&(self->re_vio), buf, count); |
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| 339 | } else { |
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| 340 | return roar_vio_write(self->backend, buf, count); |
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| 341 | } |
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| 342 | } |
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| 343 | |
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| 344 | int roar_vio_buffer_nonblock(struct roar_vio_calls * vio, int state) { |
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| 345 | struct roar_vio_buffer * self = vio->inst; |
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| 346 | |
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| 347 | if ( self->use_re ) { |
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| 348 | return roar_vio_nonblock(&(self->re_vio), state); |
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| 349 | } else { |
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| 350 | return roar_vio_nonblock(self->backend, state); |
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| 351 | } |
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| 352 | } |
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| 353 | |
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[3969] | 354 | //ll |
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