author | William Roberts <williamr@symbian.org> |
Fri, 07 Aug 2009 11:20:16 +0100 | |
changeset 7 | b016402e601c |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
1
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1 |
/* |
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2 |
SDL - Simple DirectMedia Layer |
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Copyright (C) 1997-2004 Sam Lantinga |
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|
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5 |
This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Library General Public |
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License as published by the Free Software Foundation; either |
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version 2 of the License, or (at your option) any later version. |
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|
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Library General Public License for more details. |
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|
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You should have received a copy of the GNU Library General Public |
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License along with this library; if not, write to the Free |
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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|
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Sam Lantinga |
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slouken@libsdl.org |
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*/ |
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#include "SDL_config.h" |
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|
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/* This is the Mac OS X / CoreAudio specific header for the SDL CD-ROM API |
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Contributed by Darrell Walisser and Max Horn |
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*/ |
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|
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/*********************************************************************************** |
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Implementation Notes |
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********************* |
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|
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This code has several limitations currently (all of which are proabaly fixable): |
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|
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1. A CD-ROM device is inferred from a mounted cdfs volume, so device 0 is |
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not necessarily the first CD-ROM device on the system. (Somewhat easy to fix |
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by useing the device name from the volume id's to reorder the volumes) |
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|
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2. You can only open and control 1 CD-ROM device at a time. (Challenging to fix, |
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due to extensive code restructuring) |
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|
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3. The status reported by SDL_CDStatus only changes to from CD_PLAYING to CD_STOPPED in |
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1-second intervals (because the audio is buffered in 1-second chunks) If |
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the audio data is less than 1 second, the remainder is filled with silence. |
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|
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If you need to play sequences back-to-back that are less that 1 second long, |
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use the frame position to determine when to play the next sequence, instead |
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of SDL_CDStatus. |
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|
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This may be possible to fix with a clever usage of the AudioUnit API. |
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|
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4. When new volumes are inserted, our volume information is not updated. The only way |
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to refresh this information is to reinit the CD-ROM subsystem of SDL. To fix this, |
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one would probably have to fix point 1 above first, then figure out how to register |
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for a notification when new media is mounted in order to perform an automatic |
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rescan for cdfs volumes. |
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56 |
|
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|
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|
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So, here comes a description of how this all works. |
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< Initializing > |
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62 |
|
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To get things rolling, we have to locate mounted volumes that contain |
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audio (since nearly all Macs don't have analog audio-in on the sound card). |
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That's easy, since these volumes have a flag that indicates this special |
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filesystem. See DetectAudioCDVolumes() in CDPlayer.cpp for this code. |
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67 |
|
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Next, we parse the invisible .TOC.plist in the root of the volume, which gets us |
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the track information (number, offset, length, leadout, etc). See ReadTOCData() in |
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CDPlayer.cpp for the skinny on this. |
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|
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< The Playback Loop > |
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74 |
|
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Now come the tricky parts. Let's start with basic audio playback. When a frame |
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range to play is requested, we must first find the .aiff files on the volume, |
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hopefully in the right order. Since these files all begin with a number "1 Audio Track", |
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etc, this is used to determine the correct track order. |
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79 |
|
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Once all files are determined, we have to find what file corresponds to the start |
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and length parameter to SDL_SYS_CDPlay(). Again, this is quite simple by walking the |
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cdrom's track list. At this point, we also save the offset to the next track and frames |
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remaining, if we're going to have to play another file after the first one. See |
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GetFileForOffset() for this code. |
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85 |
|
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86 |
At this point we have all info needed to start playback, so we hand off to the LoadFile() |
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function, which proceeds to do its magic and plays back the file. |
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88 |
|
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When the file is finished playing, CompletionProc() is invoked, at which time we can |
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play the next file if the previously saved next track and frames remaining |
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indicates that we should. |
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92 |
|
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93 |
|
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94 |
< Magic > |
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95 |
|
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96 |
OK, so it's not really magic, but since I don't fully understand all the hidden details it |
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97 |
seems like it to me ;-) The API's involved are the AudioUnit and AudioFile API's. These |
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appear to be an extension of CoreAudio for creating modular playback and f/x entities. |
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99 |
The important thing is that CPU usage is very low and reliability is very high. You'd |
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100 |
be hard-pressed to find a way to stutter the playback with other CPU-intensive tasks. |
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101 |
|
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102 |
One part of this magic is that it uses multiple threads, which carries the usual potential |
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103 |
for disaster if not handled carefully. Playback currently requires 4 additional threads: |
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104 |
1. The coreaudio runloop thread |
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105 |
2. The coreaudio device i/o thread |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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106 |
3. The file streaming thread |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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107 |
4. The notification/callback thread |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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108 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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109 |
The first 2 threads are necessary evil - CoreAudio creates this no matter what the situation |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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110 |
is (even the SDL sound implementation creates theses suckers). The last two are are created |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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111 |
by us. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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112 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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113 |
The file is streamed from disk using a threaded double-buffer approach. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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114 |
This way, the high latency operation of reading from disk can be performed without interrupting |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
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115 |
the real-time device thread (which amounts to avoiding dropouts). The device thread grabs the |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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116 |
buffer that isn't being read and sends it to the CoreAudio mixer where it eventually gets |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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117 |
to the sound card. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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118 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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119 |
The device thread posts a notification when the file streaming thread is out of data. This |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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120 |
notification must be handled in a separate thread to avoid potential deadlock in the |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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121 |
device thread. That's where the notification thread comes in. This thread is signaled |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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122 |
whenever a notification needs to be processed, so another file can be played back if need be. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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123 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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124 |
The API in CDPlayer.cpp contains synchronization because otherwise both the notification thread |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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125 |
and main thread (or another other thread using the SDL CD api) can potentially call it at the same time. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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126 |
|
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127 |
************************************************************************************/ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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128 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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129 |
|
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#include "SDL_cdrom.h" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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#include "../SDL_syscdrom.h" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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132 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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#include "CDPlayer.h" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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134 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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#define kErrorFakeDevice "Error: Cannot proceed since we're faking a CD-ROM device. Reinit the CD-ROM subsystem to scan for new volumes." |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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136 |