1 /* ScummVM - Graphic Adventure Engine
2 *
3 * ScummVM is the legal property of its developers, whose names
4 * are too numerous to list here. Please refer to the COPYRIGHT
5 * file distributed with this source distribution.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 *
21 */
22
23 #ifdef __SYMBIAN32__
24
25 #include "backends/mixer/symbiansdl/symbiansdl-mixer.h"
26 #include "common/system.h"
27
28 #ifdef SAMPLES_PER_SEC_8000 // the GreanSymbianMMP format cannot handle values for defines :(
29 #define SAMPLES_PER_SEC 8000
30 #else
31 #define SAMPLES_PER_SEC 16000
32 #endif
33
SymbianSdlMixerManager()34 SymbianSdlMixerManager::SymbianSdlMixerManager()
35 :
36 _stereoMixBuffer(0) {
37
38 }
39
~SymbianSdlMixerManager()40 SymbianSdlMixerManager::~SymbianSdlMixerManager() {
41 delete[] _stereoMixBuffer;
42 }
43
startAudio()44 void SymbianSdlMixerManager::startAudio() {
45 // Need to create mixbuffer for stereo mix to downmix
46 if (_obtained.channels != 2) {
47 _stereoMixBuffer = new byte [_obtained.size * 2]; // * 2 for stereo values
48 }
49
50 SdlMixerManager::startAudio();
51 }
52
callbackHandler(byte * samples,int len)53 void SymbianSdlMixerManager::callbackHandler(byte *samples, int len) {
54 assert(_mixer);
55 #if defined(S60) && !defined(S60V3)
56 // If not stereo then we need to downmix
57 if (_obtained.channels != 2) {
58 _mixer->mixCallback(_stereoMixBuffer, len * 2);
59
60 int16 *bitmixDst = (int16 *)samples;
61 int16 *bitmixSrc = (int16 *)_stereoMixBuffer;
62
63 for (int loop = len / 2; loop >= 0; loop --) {
64 *bitmixDst = (*bitmixSrc + *(bitmixSrc + 1)) >> 1;
65 bitmixDst++;
66 bitmixSrc += 2;
67 }
68 } else
69 #else
70 _mixer->mixCallback(samples, len);
71 #endif
72 }
73
74 #endif
75