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