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Reviewed audio example

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Ray 2018-07-25 14:38:12 +02:00
parent 4d45173a77
commit 64e9d72c07
1 changed files with 18 additions and 17 deletions
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35
examples/audio/audio_raw_stream.c
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@ -7,7 +7,7 @@
* This example has been created using raylib 1.6 (www.raylib.com) * This example has been created using raylib 1.6 (www.raylib.com)
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details) * raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
* *
* Copyright (c) 2015 Ramon Santamaria (@raysan5) * Copyright (c) 2015-2018 Ramon Santamaria (@raysan5) and James Hofmann (@triplefox)
* *
********************************************************************************************/ ********************************************************************************************/
@ -17,7 +17,7 @@
#include <math.h> // Required for: sinf() #include <math.h> // Required for: sinf()
#include <string.h> // Required for: memcpy() #include <string.h> // Required for: memcpy()
#define MAX_SAMPLES 512 #define MAX_SAMPLES 512
#define MAX_SAMPLES_PER_UPDATE 4096 #define MAX_SAMPLES_PER_UPDATE 4096
int main() int main()
@ -70,16 +70,17 @@ int main()
// Sample mouse input. // Sample mouse input.
mousePosition = GetMousePosition(); mousePosition = GetMousePosition();
if (IsMouseButtonDown(MOUSE_LEFT_BUTTON)) {
if (IsMouseButtonDown(MOUSE_LEFT_BUTTON))
{
float fp = (float)(mousePosition.y); float fp = (float)(mousePosition.y);
frequency = 40.0f + (float)(fp); frequency = 40.0f + (float)(fp);
} }
// Rewrite the sine wave. // Rewrite the sine wave.
// Compute two cycles to allow the buffer padding, simplifying // Compute two cycles to allow the buffer padding, simplifying any modulation, resampling, etc.
// any modulation, resampling, etc. if (frequency != oldFrequency)
if (frequency != oldFrequency) { {
// Compute wavelength. Limit size in both directions. // Compute wavelength. Limit size in both directions.
int oldWavelength = waveLength; int oldWavelength = waveLength;
waveLength = (int)(22050/frequency); waveLength = (int)(22050/frequency);
@ -100,28 +101,29 @@ int main()
// Refill audio stream if required // Refill audio stream if required
if (IsAudioBufferProcessed(stream)) if (IsAudioBufferProcessed(stream))
{ {
// Synthesize a buffer that is exactly the requested size // Synthesize a buffer that is exactly the requested size
int writeCursor = 0; int writeCursor = 0;
while(writeCursor < MAX_SAMPLES_PER_UPDATE) {
while (writeCursor < MAX_SAMPLES_PER_UPDATE)
{
// Start by trying to write the whole chunk at once // Start by trying to write the whole chunk at once
int writeLength = MAX_SAMPLES_PER_UPDATE-writeCursor; int writeLength = MAX_SAMPLES_PER_UPDATE-writeCursor;
// Limit to the maximum readable size // Limit to the maximum readable size
int readLength = waveLength-readCursor; int readLength = waveLength-readCursor;
if (writeLength > readLength)
{ if (writeLength > readLength) writeLength = readLength;
writeLength = readLength;
}
// Write the slice // Write the slice
memcpy(writeBuf + writeCursor, data + readCursor, writeLength*sizeof(short)); memcpy(writeBuf + writeCursor, data + readCursor, writeLength*sizeof(short));
// Update cursors and loop audio // Update cursors and loop audio
readCursor = (readCursor + writeLength) % waveLength; readCursor = (readCursor + writeLength) % waveLength;
writeCursor += writeLength; writeCursor += writeLength;
} }
// copy finished frame to audio stream // Copy finished frame to audio stream
UpdateAudioStream(stream, writeBuf, MAX_SAMPLES_PER_UPDATE); UpdateAudioStream(stream, writeBuf, MAX_SAMPLES_PER_UPDATE);
} }
//---------------------------------------------------------------------------------- //----------------------------------------------------------------------------------
@ -132,7 +134,7 @@ int main()
ClearBackground(RAYWHITE); ClearBackground(RAYWHITE);
DrawText(FormatText("Sine frequency: %i",(int)frequency), 240, 140, 20, LIGHTGRAY); DrawText(FormatText("sine frequency: %i",(int)frequency), GetScreenWidth() - 220, 10, 20, RED);
DrawText("click mouse button to change frequency", 10, 10, 20, DARKGRAY); DrawText("click mouse button to change frequency", 10, 10, 20, DARKGRAY);
// Draw the current buffer state proportionate to the screen // Draw the current buffer state proportionate to the screen
@ -154,7 +156,6 @@ int main()
free(writeBuf); // Unload write buffer free(writeBuf); // Unload write buffer
CloseAudioStream(stream); // Close raw audio stream and delete buffers from RAM CloseAudioStream(stream); // Close raw audio stream and delete buffers from RAM
CloseAudioDevice(); // Close audio device (music streaming is automatically stopped) CloseAudioDevice(); // Close audio device (music streaming is automatically stopped)
CloseWindow(); // Close window and OpenGL context CloseWindow(); // Close window and OpenGL context