[3969] | 1 | //vio_buffer.c: |
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| 2 | |
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| 3 | /* |
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[5823] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2013 |
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[3969] | 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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[5388] | 61 | calls->flags = ROAR_VIO_FLAGS_NONE; |
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| 62 | calls->refc = 1; |
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[3971] | 63 | |
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| 64 | calls->inst = self; |
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| 65 | calls->close = roar_vio_buffer_close; |
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| 66 | calls->write = roar_vio_buffer_write; |
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| 67 | calls->ctl = roar_vio_buffer_ctl; |
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| 68 | calls->sync = roar_vio_buffer_sync; |
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| 69 | calls->lseek = roar_vio_buffer_lseek; |
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| 70 | |
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| 71 | return 0; |
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| 72 | } |
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| 73 | |
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| 74 | int roar_vio_buffer_close (struct roar_vio_calls * vio) { |
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| 75 | struct roar_vio_buffer * self = vio->inst; |
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| 76 | int ret; |
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| 77 | |
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| 78 | if ( self->buf_old != NULL ) |
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| 79 | roar_buffer_free(self->buf_old); |
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| 80 | |
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| 81 | if ( self->buf_cur != NULL ) |
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| 82 | roar_buffer_free(self->buf_cur); |
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| 83 | |
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| 84 | if ( self->use_re ) { |
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| 85 | ret = roar_vio_close(&(self->re_vio)); |
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| 86 | } else { |
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| 87 | ret = roar_vio_close(self->backend); |
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| 88 | } |
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| 89 | |
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| 90 | roar_mm_free(self); |
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| 91 | |
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| 92 | return ret; |
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| 93 | } |
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| 94 | |
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[3972] | 95 | ssize_t roar_vio_buffer_read (struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 96 | struct roar_vio_buffer * self = vio->inst; |
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| 97 | size_t havelen; |
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| 98 | size_t buflen; |
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[4535] | 99 | ssize_t ret; |
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[3972] | 100 | |
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| 101 | if ( count == 0 ) |
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| 102 | return 0; |
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| 103 | |
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| 104 | if ( buf == NULL ) |
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| 105 | return -1; |
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| 106 | |
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| 107 | if ( self->offset.is_old ) { |
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| 108 | havelen = (self->len_old + self->len_cur) - self->offset.offset; |
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| 109 | } else { |
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| 110 | havelen = self->len_cur - self->offset.offset; |
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| 111 | } |
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| 112 | |
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| 113 | if ( havelen == 0 ) { |
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[4535] | 114 | if ( self->use_re ) { |
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| 115 | ret = roar_vio_read(&(self->re_vio), buf, count); |
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| 116 | } else { |
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| 117 | ret = roar_vio_read(self->backend, buf, count); |
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| 118 | } |
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| 119 | // TODO... |
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| 120 | return ret; |
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[3972] | 121 | } else if ( count == havelen ) { |
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| 122 | if (self->offset.is_old) { |
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| 123 | buflen = count; |
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| 124 | if ( roar_buffer_shift_out(&(self->buf_old), buf, &buflen) == -1 ) |
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| 125 | return -1; |
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| 126 | |
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| 127 | if ( self->buf_old != NULL ) // strange error |
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| 128 | return buflen; |
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| 129 | |
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| 130 | buf += buflen; |
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| 131 | count -= buflen; |
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| 132 | |
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| 133 | self->len_old = 0; |
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| 134 | self->offset.is_old = 0; |
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| 135 | self->offset.offset = 0; |
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| 136 | } |
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| 137 | |
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| 138 | return -1; |
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| 139 | |
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| 140 | } else if ( count < havelen ) { |
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| 141 | } else if ( count > havelen ) { |
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| 142 | } |
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| 143 | |
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| 144 | return -1; |
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| 145 | } |
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[3971] | 146 | |
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| 147 | int roar_vio_buffer_sync (struct roar_vio_calls * vio) { |
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| 148 | struct roar_vio_buffer * self = vio->inst; |
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| 149 | struct roar_vio_calls * backend; |
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[5278] | 150 | roar_off_t dst = 0; |
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[3971] | 151 | |
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| 152 | if ( self->use_re ) { |
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| 153 | backend = &(self->re_vio); |
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| 154 | } else { |
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| 155 | backend = self->backend; |
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| 156 | } |
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| 157 | |
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| 158 | // bring backend in sync state, if this fails we do not need to continue... |
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| 159 | if ( self->use_re ) { |
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| 160 | if ( roar_vio_sync(backend) == -1 ) |
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| 161 | return -1; |
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| 162 | } else { |
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| 163 | if ( roar_vio_sync(backend) == -1 ) |
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| 164 | return -1; |
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| 165 | } |
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| 166 | |
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| 167 | if ( self->buf_old == NULL && self->buf_cur == NULL ) |
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| 168 | return 0; // we are in sync in case no buffers are currently used. |
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| 169 | |
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| 170 | if (self->buf_old != NULL && self->buf_cur == NULL ) { |
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| 171 | // we just finished the segment |
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| 172 | roar_buffer_free(self->buf_old); |
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| 173 | return 0; |
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| 174 | } |
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| 175 | |
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| 176 | // calc seek pos: |
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| 177 | if ( self->offset.is_old ) { |
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| 178 | dst = (self->len_cur + self->len_old) - self->offset.offset; |
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| 179 | } else { |
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| 180 | dst = self->len_cur - self->offset.offset; |
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| 181 | } |
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| 182 | |
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| 183 | dst = -dst; |
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| 184 | |
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| 185 | // do the seek: |
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[5278] | 186 | if ( roar_vio_lseek(backend, dst, SEEK_CUR) == (roar_off_t)-1 ) |
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[3971] | 187 | return -1; |
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| 188 | |
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| 189 | // free all internal buffers: |
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| 190 | if ( self->buf_old != NULL ) |
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| 191 | roar_buffer_free(self->buf_old); |
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| 192 | |
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| 193 | if ( self->buf_cur != NULL ) |
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| 194 | roar_buffer_free(self->buf_cur); |
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| 195 | |
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| 196 | self->offset.is_old = 0; |
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| 197 | self->offset.offset = 0; |
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| 198 | |
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| 199 | // funally bring the backend in sync state again, to be sure all changes are done. |
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| 200 | if ( self->use_re ) { |
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| 201 | if ( roar_vio_sync(backend) == -1 ) |
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| 202 | return -1; |
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| 203 | } else { |
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| 204 | if ( roar_vio_sync(backend) == -1 ) |
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| 205 | return -1; |
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| 206 | } |
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| 207 | |
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| 208 | return 0; |
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| 209 | } |
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| 210 | |
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[5278] | 211 | roar_off_t roar_vio_buffer_lseek (struct roar_vio_calls * vio, roar_off_t offset, int whence) { |
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[3971] | 212 | struct roar_vio_buffer * self = vio->inst; |
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| 213 | size_t newoff; |
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[5278] | 214 | roar_off_t ret; |
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| 215 | roar_off_t invoff; |
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[3971] | 216 | |
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| 217 | // in-memory seeking is only supported for SEEK_CUR: |
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| 218 | if ( whence == SEEK_CUR ) { |
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| 219 | if ( offset == 0 ) { |
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| 220 | return 0; |
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| 221 | } else if ( offset > 0 ) { |
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| 222 | newoff = self->offset.offset + offset; |
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| 223 | |
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| 224 | if ( self->offset.is_old ) { |
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| 225 | if ( newoff == self->len_old ) { |
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| 226 | self->offset.is_old = 0; |
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| 227 | self->offset.offset = 0; |
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| 228 | self->abspos += offset; |
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| 229 | return self->abspos; |
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| 230 | } else if ( newoff < self->len_old ) { |
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| 231 | self->offset.offset = newoff; |
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| 232 | self->abspos += offset; |
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| 233 | return self->abspos; |
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| 234 | } else if ( newoff > self->len_old ) { |
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| 235 | if ( newoff < (self->len_old + self->len_cur ) ) { |
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| 236 | self->offset.is_old = 0; |
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| 237 | self->offset.offset = offset + self->offset.offset - self->len_old; |
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| 238 | self->abspos += offset; |
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| 239 | return self->abspos; |
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| 240 | } |
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| 241 | } |
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| 242 | } else { |
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| 243 | if ( newoff == self->len_cur ) { |
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| 244 | roar_buffer_free(self->buf_old); |
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| 245 | self->buf_old = self->buf_cur; |
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| 246 | self->buf_cur = NULL; |
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| 247 | self->offset.offset = 0; |
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| 248 | self->abspos += offset; |
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| 249 | return self->abspos; |
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| 250 | } else if ( newoff < self->len_cur ) { |
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| 251 | self->offset.offset = newoff; |
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| 252 | self->abspos += offset; |
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| 253 | return self->abspos; |
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| 254 | } |
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| 255 | } |
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| 256 | } else { |
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| 257 | invoff = -offset; |
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| 258 | |
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| 259 | if ( invoff <= self->offset.offset ) { |
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| 260 | self->offset.offset = 0; |
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| 261 | self->abspos -= invoff; |
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| 262 | return self->abspos; |
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| 263 | } |
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| 264 | |
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| 265 | if ( !self->offset.is_old ) { |
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| 266 | if ( invoff > self->offset.offset ) { |
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| 267 | if ( invoff <= (self->len_old + self->offset.offset) ) { |
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| 268 | self->offset.is_old = 1; |
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| 269 | self->offset.offset = (self->len_old + self->offset.offset) - invoff; |
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| 270 | self->abspos -= invoff; |
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| 271 | return self->abspos; |
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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 | |
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| 278 | // we need to do a physical seek; |
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[5414] | 279 | // get in sync with current position, flush all buffers,... |
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[3971] | 280 | if ( roar_vio_buffer_sync(vio) == -1 ) |
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| 281 | return -1; |
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| 282 | |
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| 283 | // do the seek: |
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| 284 | if ( self->use_re ) { |
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| 285 | ret = roar_vio_lseek(&(self->re_vio), offset, whence); |
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| 286 | } else { |
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| 287 | ret = roar_vio_lseek(self->backend, offset, whence); |
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| 288 | } |
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| 289 | |
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[5278] | 290 | if (ret != (roar_off_t)-1) |
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[3971] | 291 | self->abspos = ret; |
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| 292 | |
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| 293 | return ret; |
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| 294 | } |
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| 295 | |
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[5278] | 296 | int roar_vio_buffer_ctl (struct roar_vio_calls * vio, roar_vio_ctl_t cmd, void * data) { |
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[3971] | 297 | struct roar_vio_buffer * self; |
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| 298 | |
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| 299 | if (vio == NULL || cmd == -1) |
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| 300 | return -1; |
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| 301 | |
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| 302 | ROAR_DBG("roar_vio_buffer_ctl(vio=%p, cmd=0x%.8x, data=%p) = ?", vio, cmd, data); |
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| 303 | |
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| 304 | self = vio->inst; |
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| 305 | |
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| 306 | switch (cmd) { |
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| 307 | case ROAR_VIO_CTL_GET_NAME: |
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| 308 | if ( data == NULL ) |
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| 309 | return -1; |
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| 310 | |
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| 311 | *(char**)data = "buffer"; |
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| 312 | return 0; |
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| 313 | break; |
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| 314 | case ROAR_VIO_CTL_GET_NEXT: |
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| 315 | if ( self->use_re ) { |
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| 316 | *(struct roar_vio_calls **)data = &(self->re_vio); |
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| 317 | } else { |
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| 318 | *(struct roar_vio_calls **)data = self->backend; |
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| 319 | } |
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| 320 | return 0; |
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| 321 | break; |
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| 322 | case ROAR_VIO_CTL_SET_NEXT: |
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| 323 | if ( self->use_re ) { |
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| 324 | return roar_vio_ctl(&(self->re_vio), ROAR_VIO_CTL_SET_NEXT, data); |
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| 325 | } else { |
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| 326 | self->backend = *(struct roar_vio_calls **)data; |
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| 327 | } |
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| 328 | return 0; |
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| 329 | break; |
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[5276] | 330 | case ROAR_VIO_CTL_NONBLOCK: |
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| 331 | if ( self->use_re ) { |
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| 332 | return roar_vio_ctl(&(self->re_vio), ROAR_VIO_CTL_NONBLOCK, data); |
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| 333 | } else { |
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| 334 | return roar_vio_ctl(self->backend, ROAR_VIO_CTL_NONBLOCK, data); |
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| 335 | } |
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| 336 | break; |
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[3971] | 337 | } |
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| 338 | |
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| 339 | return roar_vio_ctl((struct roar_vio_calls *) vio->inst, cmd, data); |
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| 340 | } |
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| 341 | |
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| 342 | ssize_t roar_vio_buffer_write (struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 343 | struct roar_vio_buffer * self = vio->inst; |
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| 344 | |
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| 345 | if ( self->use_re ) { |
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| 346 | return roar_vio_write(&(self->re_vio), buf, count); |
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| 347 | } else { |
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| 348 | return roar_vio_write(self->backend, buf, count); |
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| 349 | } |
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| 350 | } |
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| 351 | |
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[3969] | 352 | //ll |
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