Initializing DirectSound

Credits

Indexer

Jace Bennett

Matt Mascarenhas

Indexer

Ben Craddock

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Previous: 'Gamepad and Keyboard Input'

0:53Fix: Windows API return values and stubs

0:53Fix: Windows API return values and stubs

0:53Fix: Windows API return values and stubs

2:29Fix: XInput on Windows 8

2:29Fix: XInput on Windows 8

2:29Fix: XInput on Windows 8

3:48Fix: Restore Alt-F4 functionality

3:48Fix: Restore Alt-F4 functionality

3:48Fix: Restore Alt-F4 functionality

9:21Bool datatype idiosyncraries

9:21Bool datatype idiosyncraries

9:21Bool datatype idiosyncraries

12:55Review Alt-F4 fix

12:55Review Alt-F4 fix

12:55Review Alt-F4 fix

13:55Foreshadowing an XInput performance issue

13:55Foreshadowing an XInput performance issue

13:55Foreshadowing an XInput performance issue

16:44Intro to sound programming for games

16:44Intro to sound programming for games

16:44Intro to sound programming for games

23:55Initializing DirectSound Overview

23:55Initializing DirectSound Overview

23:55Initializing DirectSound Overview

27:03Load the library

27:03Load the library

27:03Load the library

32:00Create a DirectSound Object

32:00Create a DirectSound Object

32:00Create a DirectSound Object

33:54Configuring the DirectSound Object

33:54Configuring the DirectSound Object

33:54Configuring the DirectSound Object

38:04Creating and Configuring the Primary Buffer

38:04Creating and Configuring the Primary Buffer

38:04Creating and Configuring the Primary Buffer

51:36Creating and Configuring the Secondary Buffer

51:36Creating and Configuring the Secondary Buffer

51:36Creating and Configuring the Secondary Buffer

56:38Let's try it

56:38Let's try it

56:38Let's try it

1:00:46Final Thoughts

1:00:46Final Thoughts

1:00:46Final Thoughts

1:02:05Q&A

🗩

1:02:05Q&A

🗩

1:02:05Q&A

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1:04:05Fixing WaveFormat order

1:04:05Fixing WaveFormat order

1:04:05Fixing WaveFormat order

1:06:07Do you use data-structures like linked-list, binary trees..?

1:06:07Do you use data-structures like linked-list, binary trees..?

1:06:07Do you use data-structures like linked-list, binary trees..?

1:06:34Can you explain again why you need two buffers instead of just doing everything in one?

1:06:34Can you explain again why you need two buffers instead of just doing everything in one?

1:06:34Can you explain again why you need two buffers instead of just doing everything in one?

1:09:23Are there any case we'd want more than two [audio] channels?

1:09:23Are there any case we'd want more than two [audio] channels?

1:09:23Are there any case we'd want more than two [audio] channels?

1:11:05If the framerate would ever drop, can there be audio dropouts?

1:11:05If the framerate would ever drop, can there be audio dropouts?

1:11:05If the framerate would ever drop, can there be audio dropouts?

1:13:41The nBlockAlign and nAverageBytesPerSecond are redundant.

1:13:41The nBlockAlign and nAverageBytesPerSecond are redundant.

1:13:41The nBlockAlign and nAverageBytesPerSecond are redundant.

1:14:57On Linux will we be doing ALSA or higher level like PulseAudio/Jack?

1:14:57On Linux will we be doing ALSA or higher level like PulseAudio/Jack?

1:14:57On Linux will we be doing ALSA or higher level like PulseAudio/Jack?

1:16:00What newer sound API would you recommend instead of old DirectSound?

1:16:00What newer sound API would you recommend instead of old DirectSound?

1:16:00What newer sound API would you recommend instead of old DirectSound?

1:16:46The two second buffer doesn't sound acceptable / not-noticeable if you're playing music.

1:16:46The two second buffer doesn't sound acceptable / not-noticeable if you're playing music.

1:16:46The two second buffer doesn't sound acceptable / not-noticeable if you're playing music.

1:17:27Have or do you work in the industry?

1:17:27Have or do you work in the industry?

1:17:27Have or do you work in the industry?

1:17:54Have you thought about guest programmers tagging in to teach things like linux or whatever topic is their expertise?

1:17:54Have you thought about guest programmers tagging in to teach things like linux or whatever topic is their expertise?

1:17:54Have you thought about guest programmers tagging in to teach things like linux or whatever topic is their expertise?

1:18:35VirtualAlloc: MEM_COMMIT to MEM_RESERVE|MEM_COMMIT

1:18:35VirtualAlloc: MEM_COMMIT to MEM_RESERVE|MEM_COMMIT

1:18:35VirtualAlloc: MEM_COMMIT to MEM_RESERVE|MEM_COMMIT

1:20:23About game development as a career field

1:20:23About game development as a career field

1:20:23About game development as a career field

1:22:57Will you show us how to use bone animations or will you use spritesheets?

1:22:57Will you show us how to use bone animations or will you use spritesheets?

1:22:57Will you show us how to use bone animations or will you use spritesheets?

1:24:15More on our usage of DirectSound (Not a buffer)

1:24:15More on our usage of DirectSound (Not a buffer)

1:24:15More on our usage of DirectSound (Not a buffer)

1:25:33About game programming optimisation

1:25:33About game programming optimisation

1:25:33About game programming optimisation

1:27:56Why don't we use the second buffer to grab the handle instead of creating something just to grab a handle?

1:27:56Why don't we use the second buffer to grab the handle instead of creating something just to grab a handle?

1:27:56Why don't we use the second buffer to grab the handle instead of creating something just to grab a handle?

1:29:26Isn't this learning how to carve stone with chisel instead of using modern machinery?

1:29:26Isn't this learning how to carve stone with chisel instead of using modern machinery?

1:29:26Isn't this learning how to carve stone with chisel instead of using modern machinery?

Next: 'Writing a Square Wave to DirectSound'

Initializing DirectSound

Input Cleanup and Fixes

This episode starts with some cleanup and fixes to the input handling code from yesterday.

Windows API often uses a 0 return value to indicate success. Our stubs probably shouldn't return 0.
Windows 8 ships with xinput1_4.dll only. So we need to try each version in turn
When you handle WM_SYSKEY* messages, you lose built in Alt-F4 functionality, and have to reimplement it.

Sound Programming for Games

Casey starts with a high level overview of sound programing for games. The key ideas here are that we are allocating a circular buffer for sound, and the system will play it continually on a loop. If you haven't worked with circular buffers (or ring buffers) before, much of this code will be confusing. It's worth taking some time to familiarize yourself with them.

Resources:

Ring Buffers on "Learn C The Hard Way"

Working with DirectSound

The basic process for initializing DirectSound is as follows:

Load the Library - LoadLibrary("dsound.dll")
Create a DirectSound object - DirectSoundCreate()
Set the Cooperative Level - IDirectSound8::SetCooperativeLevel()
"Create" a primary buffer - IDirectSound8::CreateSoundBuffer()
Create a secondary buffer
Tell DirectSound to start playing the secondary buffer - IDirectSoundBuffer8::Play()

In the next episode we will look closely at how to fill this buffer and implement it in the game loop.