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 // Disable symbol overrides so that we can use system headers.
24 #define FORBIDDEN_SYMBOL_ALLOW_ALL
25
26 #include "backends/platform/iphone/osys_main.h"
27
AQBufferCallback(void * in,AudioQueueRef inQ,AudioQueueBufferRef outQB)28 void OSystem_IPHONE::AQBufferCallback(void *in, AudioQueueRef inQ, AudioQueueBufferRef outQB) {
29 //printf("AQBufferCallback()\n");
30 if (s_AudioQueue.frameCount > 0 && s_soundCallback != NULL) {
31 outQB->mAudioDataByteSize = 4 * s_AudioQueue.frameCount;
32 s_soundCallback(s_soundParam, (byte *)outQB->mAudioData, outQB->mAudioDataByteSize);
33 AudioQueueEnqueueBuffer(inQ, outQB, 0, NULL);
34 } else {
35 AudioQueueStop(s_AudioQueue.queue, false);
36 }
37 }
38
mixCallback(void * sys,byte * samples,int len)39 void OSystem_IPHONE::mixCallback(void *sys, byte *samples, int len) {
40 OSystem_IPHONE *this_ = (OSystem_IPHONE *)sys;
41 assert(this_);
42
43 if (this_->_mixer) {
44 this_->_mixer->mixCallback(samples, len);
45 }
46 }
47
setupMixer()48 void OSystem_IPHONE::setupMixer() {
49 _mixer = new Audio::MixerImpl(AUDIO_SAMPLE_RATE);
50
51 s_soundCallback = mixCallback;
52 s_soundParam = this;
53
54 startSoundsystem();
55 }
56
startSoundsystem()57 void OSystem_IPHONE::startSoundsystem() {
58 s_AudioQueue.dataFormat.mSampleRate = AUDIO_SAMPLE_RATE;
59 s_AudioQueue.dataFormat.mFormatID = kAudioFormatLinearPCM;
60 s_AudioQueue.dataFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
61 s_AudioQueue.dataFormat.mBytesPerPacket = 4;
62 s_AudioQueue.dataFormat.mFramesPerPacket = 1;
63 s_AudioQueue.dataFormat.mBytesPerFrame = 4;
64 s_AudioQueue.dataFormat.mChannelsPerFrame = 2;
65 s_AudioQueue.dataFormat.mBitsPerChannel = 16;
66 s_AudioQueue.frameCount = WAVE_BUFFER_SIZE;
67
68 if (AudioQueueNewOutput(&s_AudioQueue.dataFormat, AQBufferCallback, &s_AudioQueue, 0, kCFRunLoopCommonModes, 0, &s_AudioQueue.queue)) {
69 printf("Couldn't set the AudioQueue callback!\n");
70 _mixer->setReady(false);
71 return;
72 }
73
74 uint32 bufferBytes = s_AudioQueue.frameCount * s_AudioQueue.dataFormat.mBytesPerFrame;
75
76 for (int i = 0; i < AUDIO_BUFFERS; i++) {
77 if (AudioQueueAllocateBuffer(s_AudioQueue.queue, bufferBytes, &s_AudioQueue.buffers[i])) {
78 printf("Error allocating AudioQueue buffer!\n");
79 _mixer->setReady(false);
80 return;
81 }
82
83 AQBufferCallback(&s_AudioQueue, s_AudioQueue.queue, s_AudioQueue.buffers[i]);
84 }
85
86 AudioQueueSetParameter(s_AudioQueue.queue, kAudioQueueParam_Volume, 1.0);
87 if (AudioQueueStart(s_AudioQueue.queue, NULL)) {
88 printf("Error starting the AudioQueue!\n");
89 _mixer->setReady(false);
90 return;
91 }
92
93 _mixer->setReady(true);
94 }
95
stopSoundsystem()96 void OSystem_IPHONE::stopSoundsystem() {
97 AudioQueueStop(s_AudioQueue.queue, true);
98
99 for (int i = 0; i < AUDIO_BUFFERS; i++) {
100 AudioQueueFreeBuffer(s_AudioQueue.queue, s_AudioQueue.buffers[i]);
101 }
102
103 AudioQueueDispose(s_AudioQueue.queue, true);
104 _mixer->setReady(false);
105 }
106