| Michael Sevakis | a222f27 | 2007-12-29 19:46:35 +0000 | [diff] [blame] | 1 | /*************************************************************************** |
| 2 | * __________ __ ___. |
| 3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| 4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| 5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| 6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| 7 | * \/ \/ \/ \/ \/ |
| 8 | * $Id$ |
| 9 | * |
| 10 | * Miscellaneous helper API definitions |
| 11 | * |
| 12 | * Copyright (c) 2007 Michael Sevakis |
| 13 | * |
| Daniel Stenberg | 2acc0ac | 2008-06-28 18:10:04 +0000 | [diff] [blame^] | 14 | * This program is free software; you can redistribute it and/or |
| 15 | * modify it under the terms of the GNU General Public License |
| 16 | * as published by the Free Software Foundation; either version 2 |
| 17 | * of the License, or (at your option) any later version. |
| Michael Sevakis | a222f27 | 2007-12-29 19:46:35 +0000 | [diff] [blame] | 18 | * |
| 19 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| 20 | * KIND, either express or implied. |
| 21 | * |
| 22 | ****************************************************************************/ |
| 23 | #include "plugin.h" |
| 24 | #include "mpegplayer.h" |
| 25 | |
| 26 | /** Streams **/ |
| 27 | |
| 28 | /* Ensures direction is -1 or 1 and margin is properly initialized */ |
| 29 | void stream_scan_normalize(struct stream_scan *sk) |
| 30 | { |
| 31 | if (sk->dir >= 0) |
| 32 | { |
| 33 | sk->dir = SSCAN_FORWARD; |
| 34 | sk->margin = sk->len; |
| 35 | } |
| 36 | else if (sk->dir < 0) |
| 37 | { |
| 38 | sk->dir = SSCAN_REVERSE; |
| 39 | sk->margin = 0; |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | /* Moves a scan cursor. If amount is positive, the increment is in the scan |
| 44 | * direction, otherwise opposite the scan direction */ |
| 45 | void stream_scan_offset(struct stream_scan *sk, off_t by) |
| 46 | { |
| 47 | off_t bydir = by*sk->dir; |
| 48 | sk->pos += bydir; |
| 49 | sk->margin -= bydir; |
| 50 | sk->len -= by; |
| 51 | } |
| 52 | |
| 53 | /** Time helpers **/ |
| 54 | void ts_to_hms(uint32_t pts, struct hms *hms) |
| 55 | { |
| 56 | hms->frac = pts % TS_SECOND; |
| 57 | hms->sec = pts / TS_SECOND; |
| 58 | hms->min = hms->sec / 60; |
| 59 | hms->hrs = hms->min / 60; |
| 60 | hms->sec %= 60; |
| 61 | hms->min %= 60; |
| 62 | } |
| 63 | |
| 64 | void hms_format(char *buf, size_t bufsize, struct hms *hms) |
| 65 | { |
| 66 | /* Only display hours if nonzero */ |
| 67 | if (hms->hrs != 0) |
| 68 | { |
| 69 | rb->snprintf(buf, bufsize, "%u:%02u:%02u", |
| 70 | hms->hrs, hms->min, hms->sec); |
| 71 | } |
| 72 | else |
| 73 | { |
| 74 | rb->snprintf(buf, bufsize, "%u:%02u", |
| 75 | hms->min, hms->sec); |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | /** Maths **/ |
| 80 | uint32_t muldiv_uint32(uint32_t multiplicand, |
| 81 | uint32_t multiplier, |
| 82 | uint32_t divisor) |
| 83 | { |
| 84 | if (divisor != 0) |
| 85 | { |
| 86 | uint64_t prod = (uint64_t)multiplier*multiplicand + divisor/2; |
| 87 | |
| 88 | if ((uint32_t)(prod >> 32) < divisor) |
| 89 | return (uint32_t)(prod / divisor); |
| 90 | } |
| 91 | else if (multiplicand == 0 || multiplier == 0) |
| 92 | { |
| 93 | return 0; /* 0/0 = 0 : yaya */ |
| 94 | } |
| 95 | /* else (> 0) / 0 = UINT32_MAX */ |
| 96 | |
| 97 | return UINT32_MAX; /* Saturate */ |
| 98 | } |