Mercurial > almixer_isolated

comparison Isolated/LGPL/SDL_sound_minimal.c @ 38:71b465ff0622

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added support files.
author Eric Wing <ewing@anscamobile.com>
date Thu, 28 Apr 2011 16:22:30 -0700
parents
children 96c61ac12446
comparison
equal deleted inserted replaced
37:b346b6608eab 38:71b465ff0622
1 /*
2 * SDL_sound -- An abstract sound format decoding API.
3 * Copyright (C) 2001 Ryan C. Gordon.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 /*
21 Attention: This is a stripped down file of SDL_endian for our purposes.
22 This code is licensed under the LGPL.
23 This means we must not compile this code into anything that we are not willing to
24 publicly release source code.
25 You should compile this into a separate dynamic library that is isolated from proprietary code.
26 */
27
28
29 #include <stdint.h>
30 #include "SoundDecoder.h"
31
32 uint32_t __Sound_convertMsToBytePos(Sound_AudioInfo *info, uint32_t ms)
33 {
34 /* "frames" == "sample frames" */
35 float frames_per_ms = ((float) info->rate) / 1000.0f;
36 uint32_t frame_offset = (uint32_t) (frames_per_ms * ((float) ms));
37 uint32_t frame_size = (uint32_t) ((info->format & 0xFF) / 8) * info->channels;
38 return(frame_offset * frame_size);
39 } /* __Sound_convertMsToBytePos */
40
41