182 lines
4.5 KiB
C
182 lines
4.5 KiB
C
/* play.c - command to play a tune */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2005,2007,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Lots of this file is borrowed from GNU/Hurd generic-speaker driver. */
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#include <grub/dl.h>
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#include <grub/file.h>
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#include <grub/disk.h>
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#include <grub/term.h>
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#include <grub/misc.h>
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#include <grub/cpu/io.h>
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#include <grub/command.h>
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#include <grub/i18n.h>
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#include <grub/time.h>
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#include <grub/speaker.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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#define BASE_TEMPO (60 * 1000)
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#define T_REST ((grub_uint16_t) 0)
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#define T_FINE ((grub_uint16_t) -1)
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struct note
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{
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grub_uint16_t pitch;
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grub_uint16_t duration;
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};
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/* Returns whether playing should continue. */
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static int
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play (unsigned tempo, struct note *note)
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{
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grub_uint64_t to;
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if (note->pitch == T_FINE || grub_getkey_noblock () != GRUB_TERM_NO_KEY)
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return 1;
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grub_dprintf ("play", "pitch = %d, duration = %d\n", note->pitch,
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note->duration);
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switch (note->pitch)
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{
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case T_REST:
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grub_speaker_beep_off ();
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break;
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default:
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grub_speaker_beep_on (note->pitch);
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break;
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}
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to = grub_get_time_ms () + BASE_TEMPO * note->duration / tempo;
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while ((grub_get_time_ms () <= to)
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&& (grub_getkey_noblock () == GRUB_TERM_NO_KEY));
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return 0;
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}
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static grub_err_t
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grub_cmd_play (grub_command_t cmd __attribute__ ((unused)),
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int argc, char **args)
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{
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if (argc < 1)
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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/* TRANSLATORS: It's musical notes, not the notes
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you take. Play command expects arguments which can
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be either a filename or tempo+notes.
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This error happens if none is specified. */
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N_("filename or tempo and notes expected"));
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if (argc == 1)
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{
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struct note buf;
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grub_uint32_t tempo;
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grub_file_t file;
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file = grub_file_open (args[0]);
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if (! file)
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return grub_errno;
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if (grub_file_read (file, &tempo, sizeof (tempo)) != sizeof (tempo))
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{
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grub_file_close (file);
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if (!grub_errno)
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grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
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args[0]);
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return grub_errno;
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}
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tempo = grub_le_to_cpu32 (tempo);
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grub_dprintf ("play","tempo = %d\n", tempo);
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while (grub_file_read (file, &buf,
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sizeof (struct note)) == sizeof (struct note))
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{
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buf.pitch = grub_le_to_cpu16 (buf.pitch);
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buf.duration = grub_le_to_cpu16 (buf.duration);
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if (play (tempo, &buf))
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break;
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}
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grub_file_close (file);
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}
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else
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{
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char *end;
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unsigned tempo;
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struct note note;
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int i;
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tempo = grub_strtoul (args[0], &end, 0);
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if (*end)
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/* Was not a number either, assume it was supposed to be a file name. */
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return grub_error (GRUB_ERR_FILE_NOT_FOUND, N_("file `%s' not found"), args[0]);
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grub_dprintf ("play","tempo = %d\n", tempo);
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for (i = 1; i + 1 < argc; i += 2)
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{
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note.pitch = grub_strtoul (args[i], &end, 0);
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if (grub_errno)
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break;
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if (*end)
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{
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grub_error (GRUB_ERR_BAD_NUMBER, N_("unrecognized number"));
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break;
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}
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note.duration = grub_strtoul (args[i + 1], &end, 0);
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if (grub_errno)
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break;
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if (*end)
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{
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grub_error (GRUB_ERR_BAD_NUMBER, N_("unrecognized number"));
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break;
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}
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if (play (tempo, ¬e))
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break;
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}
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}
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grub_speaker_beep_off ();
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return 0;
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}
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static grub_command_t cmd;
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GRUB_MOD_INIT(play)
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{
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cmd = grub_register_command ("play", grub_cmd_play,
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N_("FILE | TEMPO [PITCH1 DURATION1] [PITCH2 DURATION2] ... "),
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N_("Play a tune."));
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}
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GRUB_MOD_FINI(play)
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{
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grub_unregister_command (cmd);
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}
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