| /*************************************************************************** |
| * __________ __ ___. |
| * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| * \/ \/ \/ \/ \/ |
| * $Id$ |
| * |
| * Miscellaneous helper API definitions |
| * |
| * Copyright (c) 2007 Michael Sevakis |
| * |
| * This program 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 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| * KIND, either express or implied. |
| * |
| ****************************************************************************/ |
| #include "plugin.h" |
| #include "mpegplayer.h" |
| |
| /** Streams **/ |
| |
| /* Ensures direction is -1 or 1 and margin is properly initialized */ |
| void stream_scan_normalize(struct stream_scan *sk) |
| { |
| if (sk->dir >= 0) |
| { |
| sk->dir = SSCAN_FORWARD; |
| sk->margin = sk->len; |
| } |
| else if (sk->dir < 0) |
| { |
| sk->dir = SSCAN_REVERSE; |
| sk->margin = 0; |
| } |
| } |
| |
| /* Moves a scan cursor. If amount is positive, the increment is in the scan |
| * direction, otherwise opposite the scan direction */ |
| void stream_scan_offset(struct stream_scan *sk, off_t by) |
| { |
| off_t bydir = by*sk->dir; |
| sk->pos += bydir; |
| sk->margin -= bydir; |
| sk->len -= by; |
| } |
| |
| /** Time helpers **/ |
| void ts_to_hms(uint32_t pts, struct hms *hms) |
| { |
| hms->frac = pts % TS_SECOND; |
| hms->sec = pts / TS_SECOND; |
| hms->min = hms->sec / 60; |
| hms->hrs = hms->min / 60; |
| hms->sec %= 60; |
| hms->min %= 60; |
| } |
| |
| void hms_format(char *buf, size_t bufsize, struct hms *hms) |
| { |
| /* Only display hours if nonzero */ |
| if (hms->hrs != 0) |
| { |
| rb->snprintf(buf, bufsize, "%u:%02u:%02u", |
| hms->hrs, hms->min, hms->sec); |
| } |
| else |
| { |
| rb->snprintf(buf, bufsize, "%u:%02u", |
| hms->min, hms->sec); |
| } |
| } |
| |
| /** Maths **/ |
| uint32_t muldiv_uint32(uint32_t multiplicand, |
| uint32_t multiplier, |
| uint32_t divisor) |
| { |
| if (divisor != 0) |
| { |
| uint64_t prod = (uint64_t)multiplier*multiplicand + divisor/2; |
| |
| if ((uint32_t)(prod >> 32) < divisor) |
| return (uint32_t)(prod / divisor); |
| } |
| else if (multiplicand == 0 || multiplier == 0) |
| { |
| return 0; /* 0/0 = 0 : yaya */ |
| } |
| /* else (> 0) / 0 = UINT32_MAX */ |
| |
| return UINT32_MAX; /* Saturate */ |
| } |