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/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Audio functions used in dev-mode kernel selection.
*/
#include "gbb_header.h"
#include "utility.h"
#include "vboot_api.h"
#include "vboot_audio.h"
#include "vboot_common.h"
typedef struct VbDevMusicNote {
uint16_t msec;
uint16_t frequency;
} __attribute__((packed)) VbDevMusicNote;
typedef struct VbDevMusic {
uint8_t sig[4]; /* "$SND" */
uint32_t checksum; /* crc32 over count & all notes */
uint32_t count; /* number of notes */
VbDevMusicNote notes[1]; /* gcc allows [0], MSVC doesn't */
/* more VbDevMusicNotes follow immediately */
} __attribute__((packed)) VbDevMusic;
static struct VbAudioContext {
uint32_t note_count;
VbDevMusicNote* music_notes;
uint32_t current_note;
uint32_t current_note_loops;
int background_beep;
} au;
#define DEV_LOOP_TIME 10 /* Minimum note granularity in msecs */
static uint16_t VbMsecToLoops(uint16_t msec) {
return (DEV_LOOP_TIME / 2 + msec) / DEV_LOOP_TIME;
}
static VbDevMusicNote default_notes[] = { {20000, 0}, /* 20 seconds */
{250, 400}, /* two beeps */
{250, 0},
{250, 400},
{9250, 0} }; /* total 30 seconds */
static VbDevMusicNote short_notes[] = { {2000, 0} }; /* two seconds */
/* Return a valid set of note events. */
static VbDevMusicNote* VbGetDevMusicNotes(uint32_t* count, int use_short) {
if (use_short) {
*count = sizeof(short_notes) / sizeof(short_notes[0]);
return short_notes;
}
*count = sizeof(default_notes) / sizeof(default_notes[0]);
return default_notes;
}
/* Initialization function. Returns context for processing dev-mode delay */
VbAudioContext* VbAudioOpen(VbCommonParams* cparams) {
GoogleBinaryBlockHeader* gbb = (GoogleBinaryBlockHeader*)cparams->gbb_data;
VbAudioContext* audio = &au;
/* Note: may need to allocate things here in future */
/* defaults */
audio->note_count = 0;
audio->music_notes = 0;
audio->current_note = 0;
audio->current_note_loops = 0;
audio->background_beep = 1;
/* See if we have full background sound capability or not. */
if (VBERROR_SUCCESS != VbExBeep(0,0)) {
VBDEBUG(("VbAudioOpen() - VbExBeep() is limited\n"));
audio->background_beep = 0;
}
/* Prepare to generate audio/delay event. Use a short developer screen delay
* if indicated by GBB flags.
*/
if (gbb->major_version == GBB_MAJOR_VER && gbb->minor_version >= 1
&& (gbb->flags & GBB_FLAG_DEV_SCREEN_SHORT_DELAY)) {
VBDEBUG(("VbAudioOpen() - using short developer screen delay\n"));
audio->music_notes = VbGetDevMusicNotes(&(audio->note_count), 1);
} else {
audio->music_notes = VbGetDevMusicNotes(&(audio->note_count), 0);
}
VBDEBUG(("VbAudioOpen() - note count %d\n", audio->note_count));
return audio;
}
/* Caller should loop without extra delay until this returns false */
int VbAudioLooping(VbAudioContext* audio) {
/* Time to play a note? */
if (!audio->current_note_loops) {
VBDEBUG(("VbAudioLooping() - current_note is %d\n", audio->current_note));
/* Hooray, out of notes! */
if (audio->current_note >= audio->note_count)
return 0;
/* For how many loops do we hold this note? */
audio->current_note_loops =
VbMsecToLoops(audio->music_notes[audio->current_note].msec);
VBDEBUG(("VbAudioLooping() - new current_note_loops == %d\n",
audio->current_note_loops));
if (audio->background_beep) {
/* start (or stop) the sound */
VbExBeep(0, audio->music_notes[audio->current_note].frequency);
} else if (audio->music_notes[audio->current_note].frequency) {
/* the sound will block, so don't loop repeatedly */
audio->current_note_loops = 1;
VbExBeep(audio->music_notes[audio->current_note].msec,
audio->music_notes[audio->current_note].frequency);
}
audio->current_note++;
}
/* Wait a bit. Yes, one extra loop sometimes, but it's only 10msec */
VbExSleepMs(DEV_LOOP_TIME);
/* That's one... */
if (audio->current_note_loops)
audio->current_note_loops--;
return 1;
}
/* Caller should call this prior to booting */
void VbAudioClose(VbAudioContext* audio) {
VbExBeep(0,0);
/* Note: Free any allocated structs here */
}
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