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Diffstat (limited to 'www/devmaster/lesson8.html')
| -rw-r--r-- | www/devmaster/lesson8.html | 47 |
1 files changed, 41 insertions, 6 deletions
diff --git a/www/devmaster/lesson8.html b/www/devmaster/lesson8.html index 4d68908..a091df1 100644 --- a/www/devmaster/lesson8.html +++ b/www/devmaster/lesson8.html @@ -135,7 +135,13 @@ tutorial. <var>OggStreamer</var> which is the main class doing most of the worki </p> -<pre class="code"> // The size of a chunk from the stream that we want to read for each update.<br> private static int BUFFER_SIZE = 4096*8;<br></pre> +<pre class="code"> + // The size of a chunk from the stream that we want to read for each update. + private static int BUFFER_SIZE = 4096*8; + + // The number of buffers used in the audio pipeline + private static int NUM_BUFFERS = 2; +</pre> @@ -170,8 +176,13 @@ just yet. I believe my comments should give you an idea of what they're for.</p> -<pre class="code"> // Buffers hold sound data. There are two of them (front/back)<br> private int[] buffers = new int[2];<br> <br> // Sources are points emitting sound.<br> private int[] source = new int[1];<br> <br> private int format; // OpenAL data format<br> private int rate; // sample rate<br></pre> - +<pre class="code"> + // Buffers hold sound data. There are two of them by default (front/back) + private int[] buffers = new int[NUM_BUFFERS]; + + // Sources are points emitting sound. + private int[] source = new int[1]; +</pre> <p>First thing that I want to point out is that we have 2 buffers dedicated to @@ -197,7 +208,7 @@ enumerator based on how many channels are in the Ogg and then make a not of the -<pre class="code"> public boolean open() {<br> ...<br><br> al.alGenBuffers(2, buffers, 0); check();<br> al.alGenSources(1, source, 0); check();<br><br> al.alSourcefv(source[0], AL.AL_POSITION , sourcePos, 0);<br> al.alSourcefv(source[0], AL.AL_VELOCITY , sourceVel, 0);<br> al.alSourcefv(source[0], AL.AL_DIRECTION, sourceDir, 0);<br> <br> al.alSourcef(source[0], AL.AL_ROLLOFF_FACTOR, 0.0f );<br> al.alSourcei(source[0], AL.AL_SOURCE_RELATIVE, AL.AL_TRUE);<br><br> ...<br> }<br></pre> +<pre class="code"> public boolean open() {<br> ...<br><br> al.alGenBuffers(NUM_BUFFERS, buffers, 0); check();<br> al.alGenSources(1, source, 0); check();<br><br> al.alSourcefv(source[0], AL.AL_POSITION , sourcePos, 0);<br> al.alSourcefv(source[0], AL.AL_VELOCITY , sourceVel, 0);<br> al.alSourcefv(source[0], AL.AL_DIRECTION, sourceDir, 0);<br> <br> al.alSourcef(source[0], AL.AL_ROLLOFF_FACTOR, 0.0f );<br> al.alSourcei(source[0], AL.AL_SOURCE_RELATIVE, AL.AL_TRUE);<br><br> ...<br> }<br></pre> @@ -211,7 +222,16 @@ will still hear it. The same idea applies to source relativity.</p> -<pre class="code"> public void release() {<br> al.alSourceStop(source[0]);<br> empty();<br><br> al.alDeleteSources(1, source, 0); check();<br> al.alDeleteBuffers(2, buffers, 0); check();<br> }<br></pre> +<pre class="code"> + public void release() { + al.alSourceStop(source[0]); + empty(); + + for (int i = 0; i < NUM_BUFFERS; i++) { + al.alDeleteSources(i, source, 0); check(); + } + } +</pre> <p>We can clean up after ourselves using this. We stop the source, empty out any @@ -219,7 +239,22 @@ buffers that are still in the queue, and destroy our objects. </p> -<pre class="code"> public boolean playback() {<br> if (playing())<br> return true;<br> <br> if (!stream(buffers[0]))<br> return false;<br> <br> if(!stream(buffers[1]))<br> return false;<br> <br> al.alSourceQueueBuffers(source[0], 2, buffers, 0);<br> al.alSourcePlay(source[0]);<br> <br> return true;<br> }<br></pre> +<pre class="code"> + public boolean playback() { + if (playing()) + return true; + + for (int i = 0; i < NUM_BUFFERS; i++) { + if (!stream(buffers[i])) + return false; + } + + al.alSourceQueueBuffers(source[0], NUM_BUFFERS, buffers, 0); + al.alSourcePlay(source[0]); + + return true; + } +</pre> |