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annotate src/cdrom/macosx/AudioFilePlayer.cpp @ 803:355632dca928

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Updated SDL HTML documentation
author Sam Lantinga <slouken@libsdl.org>
date Tue, 10 Feb 2004 15:15:40 +0000
parents da0a2ad35bf4
children f8d5ddc7aef1
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21
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22 This file based on Apple sample code. We haven't changed the file name,
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23 so if you want to see the original search for it on apple.com/developer
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24 */
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25
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26 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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27 // AudioFilePlayer.cpp
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28 //
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29 #include "AudioFilePlayer.h"
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30
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31 void ThrowResult (OSStatus result, const char* str)
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32 {
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33 SDL_SetError ("Error: %s %d", str, result);
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34 throw result;
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35 }
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36
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37 #if DEBUG
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38 void PrintStreamDesc (AudioStreamBasicDescription *inDesc)
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39 {
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40 if (!inDesc) {
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41 printf ("Can't print a NULL desc!\n");
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42 return;
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43 }
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44
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45 printf ("- - - - - - - - - - - - - - - - - - - -\n");
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46 printf (" Sample Rate:%f\n", inDesc->mSampleRate);
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47 printf (" Format ID:%s\n", (char*)&inDesc->mFormatID);
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48 printf (" Format Flags:%lX\n", inDesc->mFormatFlags);
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49 printf (" Bytes per Packet:%ld\n", inDesc->mBytesPerPacket);
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50 printf (" Frames per Packet:%ld\n", inDesc->mFramesPerPacket);
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51 printf (" Bytes per Frame:%ld\n", inDesc->mBytesPerFrame);
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52 printf (" Channels per Frame:%ld\n", inDesc->mChannelsPerFrame);
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53 printf (" Bits per Channel:%ld\n", inDesc->mBitsPerChannel);
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54 printf ("- - - - - - - - - - - - - - - - - - - -\n");
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55 }
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56 #endif
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57
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58 OSStatus AudioFileManager::FileInputProc (void *inRefCon,
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59 AudioUnitRenderActionFlags inActionFlags,
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60 const AudioTimeStamp *inTimeStamp,
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61 UInt32 inBusNumber,
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62 AudioBuffer *ioData)
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63 {
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64 AudioFileManager* THIS = (AudioFileManager*)inRefCon;
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65 return THIS->Render(*ioData);
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66 }
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67
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68 OSStatus AudioFileManager::Render (AudioBuffer &ioData)
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69 {
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70 OSStatus result = AudioConverterFillBuffer(mParentConverter,
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71 AudioFileManager::ACInputProc,
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72 this,
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73 &ioData.mDataByteSize,
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74 ioData.mData);
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75 if (result) {
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76 SDL_SetError ("AudioConverterFillBuffer:%ld\n", result);
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77 mParent.DoNotification (result);
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78 } else {
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79 mByteCounter += ioData.mDataByteSize / 2;
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80 AfterRender();
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81 }
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82 return result;
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83 }
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84
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85 OSStatus AudioFileManager::ACInputProc (AudioConverterRef inAudioConverter,
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86 UInt32* outDataSize,
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87 void** outData,
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88 void* inUserData)
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89 {
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90 AudioFileManager* THIS = (AudioFileManager*)inUserData;
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91 return THIS->GetFileData(outData, outDataSize);
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92 }
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93
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94 AudioFileManager::~AudioFileManager ()
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95 {
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96 if (mFileBuffer) {
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97 free (mFileBuffer);
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98 mFileBuffer = 0;
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99 }
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100 }
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101
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102 AudioFilePlayer::AudioFilePlayer (const FSRef *inFileRef)
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103 : mConnected (false),
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104 mAudioFileManager (0),
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105 mConverter (0),
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106 mNotifier (0),
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107 mStartFrame (0)
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108 {
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109 SInt64 fileDataSize = 0;
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110
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111 OpenFile (inFileRef, fileDataSize);
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112
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113 // we want about 4 seconds worth of data for the buffer
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114 int bytesPerSecond = UInt32 (4 * mFileDescription.mSampleRate * mFileDescription.mBytesPerFrame);
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115
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116 #if DEBUG
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117 printf("File format:\n");
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118 PrintStreamDesc (&mFileDescription);
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119 #endif
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120
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121 mAudioFileManager = new AudioFileManager (*this,
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122 mForkRefNum,
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123 fileDataSize,
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124 bytesPerSecond);
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125 }
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126
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127 // you can put a rate scalar here to play the file faster or slower
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128 // by multiplying the same rate by the desired factor
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129 // eg fileSampleRate * 2 -> twice as fast
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130 // before you create the AudioConverter
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131 void AudioFilePlayer::SetDestination (AudioUnit &inDestUnit,
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132 int inBusNumber)
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133 {
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134 if (mConnected) throw static_cast<OSStatus>(-1); //can't set dest if already engaged
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135
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136 mPlayUnit = inDestUnit;
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137 mBusNumber = inBusNumber;
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138
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139 OSStatus result = noErr;
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140
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141 if (mConverter) {
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142 result = AudioConverterDispose (mConverter);
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143 THROW_RESULT("AudioConverterDispose")
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144 }
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145
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146 AudioStreamBasicDescription destDesc;
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147 UInt32 size = sizeof (destDesc);
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148 result = AudioUnitGetProperty (inDestUnit,
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149 kAudioUnitProperty_StreamFormat,
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150 kAudioUnitScope_Input,
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151 inBusNumber,
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152 &destDesc,
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153 &size);
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154 THROW_RESULT("AudioUnitGetProperty")
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155
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156 #if DEBUG
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157 printf("Destination format:\n");
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158 PrintStreamDesc (&destDesc);
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159 #endif
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160
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161 //we can "down" cast a component instance to a component
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162 ComponentDescription desc;
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163 result = GetComponentInfo ((Component)inDestUnit, &desc, 0, 0, 0);
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164 THROW_RESULT("GetComponentInfo")
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165
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166 // we're going to use this to know which convert routine to call
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167 // a v1 audio unit will have a type of 'aunt'
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168 // a v2 audio unit will have one of several different types.
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169 if (desc.componentType != kAudioUnitComponentType) {
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170 result = badComponentInstance;
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171 THROW_RESULT("BAD COMPONENT")
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172 }
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173
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174
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175 result = AudioConverterNew (&mFileDescription, &destDesc, &mConverter);
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176 THROW_RESULT("AudioConverterNew")
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177
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178 #if 0
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179 // this uses the better quality SRC
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180 UInt32 srcID = kAudioUnitSRCAlgorithm_Polyphase;
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181 result = AudioConverterSetProperty(mConverter,
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182 kAudioConverterSampleRateConverterAlgorithm,
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183 sizeof(srcID),
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184 &srcID);
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185 THROW_RESULT("AudioConverterSetProperty")
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186 #endif
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187 }
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188
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189 void AudioFilePlayer::SetStartFrame (int frame)
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190 {
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191 SInt64 position = frame * 2352;
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192
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193 mStartFrame = frame;
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194 mAudioFileManager->SetPosition (position);
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195 }
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196
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197
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198 int AudioFilePlayer::GetCurrentFrame ()
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199 {
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200 return mStartFrame + (mAudioFileManager->GetByteCounter() / 2352);
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201 }
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202
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203 void AudioFilePlayer::SetStopFrame (int frame)
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204 {
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205 SInt64 position = frame * 2352;
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206
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207 mAudioFileManager->SetEndOfFile (position);
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208 }
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209
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210 AudioFilePlayer::~AudioFilePlayer()
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211 {
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212 Disconnect();
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213
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214 if (mAudioFileManager) {
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215 delete mAudioFileManager;
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216 mAudioFileManager = 0;
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217 }
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218
768
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219 if (mForkRefNum) {
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220 FSClose (mForkRefNum);
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221 mForkRefNum = 0;
613
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222 }
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223
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224 if (mConverter) {
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225 AudioConverterDispose (mConverter);
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226 mConverter = 0;
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227 }
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228 }
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229
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230 void AudioFilePlayer::Connect()
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231 {
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232 #if DEBUG
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233 printf ("Connect:%x,%ld, engaged=%d\n", (int)mPlayUnit, mBusNumber, (mConnected ? 1 : 0));
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234 #endif
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235 if (!mConnected)
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236 {
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237 mAudioFileManager->Connect(mConverter);
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238
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239 // set the render callback for the file data to be supplied to the sound converter AU
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240 mInputCallback.inputProc = AudioFileManager::FileInputProc;
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241 mInputCallback.inputProcRefCon = mAudioFileManager;
613
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242
768
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243 OSStatus result = AudioUnitSetProperty (mPlayUnit,
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244 kAudioUnitProperty_SetInputCallback,
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245 kAudioUnitScope_Input,
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246 mBusNumber,
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247 &mInputCallback,
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248 sizeof(mInputCallback));
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249 THROW_RESULT("AudioUnitSetProperty")
613
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250 mConnected = true;
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251 }
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252 }
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253
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254 // warning noted, now please go away ;-)
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255 // #warning This should redirect the calling of notification code to some other thread
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256 void AudioFilePlayer::DoNotification (OSStatus inStatus) const
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257 {
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258 AudioFilePlayer* THIS = const_cast<AudioFilePlayer*>(this);
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259
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260 if (mNotifier) {
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261 (*mNotifier) (mRefCon, inStatus);
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262 } else {
613
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263 SDL_SetError ("Notification posted with no notifier in place");
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264
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265 if (inStatus == kAudioFilePlay_FileIsFinished)
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266 THIS->Disconnect();
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267 else if (inStatus != kAudioFilePlayErr_FilePlayUnderrun)
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268 THIS->Disconnect();
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269 }
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270 }
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271
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272 void AudioFilePlayer::Disconnect ()
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273 {
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274 #if DEBUG
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275 printf ("Disconnect:%x,%ld, engaged=%d\n", (int)mPlayUnit, mBusNumber, (mConnected ? 1 : 0));
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276 #endif
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277 if (mConnected)
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278 {
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279 mConnected = false;
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280
768
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281 mInputCallback.inputProc = 0;
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282 mInputCallback.inputProcRefCon = 0;
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283 OSStatus result = AudioUnitSetProperty (mPlayUnit,
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284 kAudioUnitProperty_SetInputCallback,
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285 kAudioUnitScope_Input,
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286 mBusNumber,
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287 &mInputCallback,
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288 sizeof(mInputCallback));
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289 if (result)
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290 SDL_SetError ("AudioUnitSetProperty:RemoveInputCallback:%ld", result);
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291
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292 mAudioFileManager->Disconnect();
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293 }
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294 }
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295
768
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296 struct SSNDData {
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297 UInt32 offset;
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298 UInt32 blockSize;
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299 };
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300
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301 void AudioFilePlayer::OpenFile (const FSRef *inRef, SInt64& outFileDataSize)
768
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302 {
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303 ContainerChunk chunkHeader;
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304 ChunkHeader chunk;
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305 SSNDData ssndData;
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306
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307 OSErr result;
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308 HFSUniStr255 dfName;
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309 ByteCount actual;
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310 SInt64 offset;
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311
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312 // Open the data fork of the input file
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313 result = FSGetDataForkName(&dfName);
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314 THROW_RESULT("AudioFilePlayer::OpenFile(): FSGetDataForkName")
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315
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316 result = FSOpenFork(inRef, dfName.length, dfName.unicode, fsRdPerm, &mForkRefNum);
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317 THROW_RESULT("AudioFilePlayer::OpenFile(): FSOpenFork")
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318
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319 // Read the file header, and check if it's indeed an AIFC file
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320 result = FSReadFork(mForkRefNum, fsAtMark, 0, sizeof(chunkHeader), &chunkHeader, &actual);
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321 THROW_RESULT("AudioFilePlayer::OpenFile(): FSReadFork")
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322
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323 if (chunkHeader.ckID != 'FORM') {
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324 result = -1;
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325 THROW_RESULT("AudioFilePlayer::OpenFile(): chunk id is not 'FORM'");
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326 }
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327
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328 if (chunkHeader.formType != 'AIFC') {
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329 result = -1;
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330 THROW_RESULT("AudioFilePlayer::OpenFile(): file format is not 'AIFC'");
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331 }
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332
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333 // Search for the SSND chunk. We ignore all compression etc. information
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334 // in other chunks. Of course that is kind of evil, but for now we are lazy
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335 // and rely on the cdfs to always give us the same fixed format.
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336 // TODO: Parse the COMM chunk we currently skip to fill in mFileDescription.
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337 offset = 0;
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338 do {
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339 result = FSReadFork(mForkRefNum, fsFromMark, offset, sizeof(chunk), &chunk, &actual);
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340 THROW_RESULT("AudioFilePlayer::OpenFile(): FSReadFork")
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341
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342 // Skip the chunk data
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343 offset = chunk.ckSize;
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344 } while (chunk.ckID != 'SSND');
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345
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346 // Read the header of the SSND chunk. After this, we are positioned right
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347 // at the start of the audio data.
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348 result = FSReadFork(mForkRefNum, fsAtMark, 0, sizeof(ssndData), &ssndData, &actual);
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349 THROW_RESULT("AudioFilePlayer::OpenFile(): FSReadFork")
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350
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351 result = FSSetForkPosition(mForkRefNum, fsFromMark, ssndData.offset);
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352 THROW_RESULT("AudioFilePlayer::OpenFile(): FSSetForkPosition")
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353
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354 // Data size
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355 outFileDataSize = chunk.ckSize - ssndData.offset - 8;
768
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356
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357 // File format
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358 mFileDescription.mSampleRate = 44100;
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359 mFileDescription.mFormatID = kAudioFormatLinearPCM;
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360 mFileDescription.mFormatFlags = kLinearPCMFormatFlagIsPacked | kLinearPCMFormatFlagIsSignedInteger;
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361 mFileDescription.mBytesPerPacket = 4;
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362 mFileDescription.mFramesPerPacket = 1;
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363 mFileDescription.mBytesPerFrame = 4;
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364 mFileDescription.mChannelsPerFrame = 2;
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365 mFileDescription.mBitsPerChannel = 16;
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366 }