b197c3b0d6
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26088 a1c6a512-1295-4272-9138-f99709370657
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Miscellaneous helper API definitions
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*
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* Copyright (c) 2007 Michael Sevakis
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "plugin.h"
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#include "mpegplayer.h"
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/** Streams **/
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/* Initializes the cursor */
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void stream_scan_init(struct stream_scan *sk)
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{
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dbuf_l2_init(&sk->l2);
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}
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/* Ensures direction is -1 or 1 and margin is properly initialized */
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void stream_scan_normalize(struct stream_scan *sk)
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{
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if (sk->dir >= 0)
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{
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sk->dir = SSCAN_FORWARD;
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sk->margin = sk->len;
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}
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else if (sk->dir < 0)
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{
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sk->dir = SSCAN_REVERSE;
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sk->margin = 0;
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}
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}
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/* Moves a scan cursor. If amount is positive, the increment is in the scan
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* direction, otherwise opposite the scan direction */
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void stream_scan_offset(struct stream_scan *sk, off_t by)
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{
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off_t bydir = by*sk->dir;
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sk->pos += bydir;
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sk->margin -= bydir;
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sk->len -= by;
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}
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/** Time helpers **/
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void ts_to_hms(uint32_t pts, struct hms *hms)
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{
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hms->frac = pts % TS_SECOND;
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hms->sec = pts / TS_SECOND;
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hms->min = hms->sec / 60;
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hms->hrs = hms->min / 60;
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hms->sec %= 60;
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hms->min %= 60;
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}
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void hms_format(char *buf, size_t bufsize, struct hms *hms)
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{
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/* Only display hours if nonzero */
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if (hms->hrs != 0)
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{
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rb->snprintf(buf, bufsize, "%u:%02u:%02u",
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hms->hrs, hms->min, hms->sec);
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}
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else
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{
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rb->snprintf(buf, bufsize, "%u:%02u",
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hms->min, hms->sec);
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}
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}
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/** Maths **/
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uint32_t muldiv_uint32(uint32_t multiplicand,
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uint32_t multiplier,
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uint32_t divisor)
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{
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if (divisor != 0)
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{
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uint64_t prod = (uint64_t)multiplier*multiplicand + divisor/2;
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if ((uint32_t)(prod >> 32) < divisor)
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return (uint32_t)(prod / divisor);
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}
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else if (multiplicand == 0 || multiplier == 0)
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{
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return 0; /* 0/0 = 0 : yaya */
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}
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/* else (> 0) / 0 = UINT32_MAX */
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return UINT32_MAX; /* Saturate */
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}
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