81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
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/*
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* Copyright (c) LSE
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY LSE AS IS AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL LSE BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sound.h>
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#include <stdlib.h>
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struct melody *load_sound(const char *path)
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{
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struct melody *melody = NULL;
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int fd = -1;
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int nb = -1;
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int i = -1;
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char *magic = ".KSF";
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char buf[5];
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if ((fd = open(path, O_RDONLY)) < 0)
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return NULL;
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buf[4] = 0;
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/* check the magic number */
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if ((read(fd, buf, 4) != 4) || (strcmp(magic, buf) != 0)) {
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close(fd);
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return NULL;
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}
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/* read the numbers of tones */
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if (read(fd, &nb, sizeof(int)) != sizeof(int)) {
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close(fd);
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return NULL;
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}
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/* allocate space to store the new melody */
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if (!(melody = malloc((nb + 1) * sizeof(struct melody)))) {
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close(fd);
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return NULL;
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}
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/* load the melody */
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for (i = 0; i < nb; i++) {
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if (read(fd, &melody[i].freq, sizeof(int)) != sizeof(int) ||
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read(fd, &melody[i].duration, sizeof(int)) != sizeof(int)) {
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close(fd);
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free(melody);
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return NULL;
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}
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}
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/* put a null tones to indicate end of melody */
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melody[nb].freq = 0;
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melody[nb].duration = (unsigned long)-1;
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close(fd);
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return (melody);
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}
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void clear_sound(struct melody *melody)
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{
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free(melody);
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}
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