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@ -1,56 +1,25 @@ |
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/******************************************************************************************* |
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* |
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* raylib [audio] example - raw stream |
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* |
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* Example complexity rating: [★★★☆] 3/4 |
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* |
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* Example originally created with raylib 1.6, last time updated with raylib 4.2 |
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* |
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* Example created by Ramon Santamaria (@raysan5) and reviewed by James Hofmann (@triplefox) |
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* |
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified, |
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* BSD-like license that allows static linking with closed source software |
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* |
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* Copyright (c) 2015-2025 Ramon Santamaria (@raysan5) and James Hofmann (@triplefox) |
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* |
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********************************************************************************************/ |
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* |
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* raylib [audio] example - raw stream |
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* |
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* Example complexity rating: [★★★☆] 3/4 |
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* |
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* Example originally created with raylib 1.6, last time updated with raylib 4.2 |
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* |
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* Example created by Ramon Santamaria (@raysan5) and reviewed by James Hofmann (@triplefox) |
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* |
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified, |
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* BSD-like license that allows static linking with closed source software |
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* |
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* Copyright (c) 2015-2025 Ramon Santamaria (@raysan5) and James Hofmann (@triplefox) |
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* |
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********************************************************************************************/ |
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#include "raylib.h" |
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#include <math.h> |
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#include <stdlib.h> // Required for: malloc(), free() |
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#include <math.h> // Required for: sinf() |
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#include <string.h> // Required for: memcpy() |
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#define MAX_SAMPLES 512 |
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#define MAX_SAMPLES_PER_UPDATE 4096 |
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// Cycles per second (hz) |
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float frequency = 440.0f; |
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// Audio frequency, for smoothing |
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float audioFrequency = 440.0f; |
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// Previous value, used to test if sine needs to be rewritten, and to smoothly modulate frequency |
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float oldFrequency = 1.0f; |
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// Index for audio rendering |
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float sineIdx = 0.0f; |
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// Audio input processing callback |
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void AudioInputCallback(void *buffer, unsigned int frames) |
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{ |
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audioFrequency = frequency + (audioFrequency - frequency)*0.95f; |
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float incr = audioFrequency/44100.0f; |
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short *d = (short *)buffer; |
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for (unsigned int i = 0; i < frames; i++) |
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{ |
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d[i] = (short)(32000.0f*sinf(2*PI*sineIdx)); |
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sineIdx += incr; |
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if (sineIdx > 1.0f) sineIdx -= 1.0f; |
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} |
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} |
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#define BUFFER_SIZE 4096 |
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#define SAMPLE_RATE 44100 |
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//------------------------------------------------------------------------------------ |
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// Program main entry point |
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@ -63,44 +32,25 @@ int main(void) |
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const int screenHeight = 450; |
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InitWindow(screenWidth, screenHeight, "raylib [audio] example - raw stream"); |
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SetTargetFPS(30); |
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InitAudioDevice(); // Initialize audio device |
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InitAudioDevice(); |
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SetAudioStreamBufferSizeDefault(MAX_SAMPLES_PER_UPDATE); |
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// Set the number of samples the stream will keep in memory at a time to BUFFER_SIZE |
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SetAudioStreamBufferSizeDefault(BUFFER_SIZE); |
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float buffer[BUFFER_SIZE] = {}; |
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// Init raw audio stream (sample rate: 44100, sample size: 16bit-short, channels: 1-mono) |
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AudioStream stream = LoadAudioStream(44100, 16, 1); |
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// Init raw audio stream (sample rate: 44100, sample size: 32bit-float, channels: 1-mono) |
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AudioStream stream = LoadAudioStream(SAMPLE_RATE, 32, 1); |
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float pan = 0.0f; |
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SetAudioStreamPan(stream, pan); |
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PlayAudioStream(stream); |
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SetAudioStreamCallback(stream, AudioInputCallback); |
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int sineFrequency = 440; |
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int newSineFrequency = 440; |
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int sineIndex = 0; |
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double sineStartTime = 0.0; |
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// Buffer for the single cycle waveform we are synthesizing |
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short *data = (short *)malloc(sizeof(short)*MAX_SAMPLES); |
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// Frame buffer, describing the waveform when repeated over the course of a frame |
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short *writeBuf = (short *)malloc(sizeof(short)*MAX_SAMPLES_PER_UPDATE); |
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PlayAudioStream(stream); // Start processing stream buffer (no data loaded currently) |
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// Position read in to determine next frequency |
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Vector2 mousePosition = { -100.0f, -100.0f }; |
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/* |
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// Cycles per second (hz) |
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float frequency = 440.0f; |
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// Previous value, used to test if sine needs to be rewritten, and to smoothly modulate frequency |
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float oldFrequency = 1.0f; |
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// Cursor to read and copy the samples of the sine wave buffer |
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int readCursor = 0; |
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*/ |
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// Computed size in samples of the sine wave |
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int waveLength = 1; |
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Vector2 position = { 0, 0 }; |
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SetTargetFPS(30); // Set our game to run at 30 frames-per-second |
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//-------------------------------------------------------------------------------------- |
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// Main game loop |
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@ -108,92 +58,84 @@ int main(void) |
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{ |
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// Update |
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//---------------------------------------------------------------------------------- |
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mousePosition = GetMousePosition(); |
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if (IsMouseButtonDown(MOUSE_BUTTON_LEFT)) |
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if (IsKeyDown(KEY_UP)) |
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{ |
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float fp = (float)(mousePosition.y); |
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frequency = 40.0f + (float)(fp); |
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newSineFrequency += 10; |
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t">float pan = (float)(mousePosition.x)/(float)screenWidth; |
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SetAudioStreamPan(stream, pan); |
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">if (newSineFrequency > 12500) |
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newSineFrequency = 12500; |
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} |
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// Rewrite the sine wave |
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// Compute two cycles to allow the buffer padding, simplifying any modulation, resampling, etc. |
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if (frequency != oldFrequency) |
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if (IsKeyDown(KEY_DOWN)) |
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{ |
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// Compute wavelength. Limit size in both directions |
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//int oldWavelength = waveLength; |
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waveLength = (int)(22050/frequency); |
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if (waveLength > MAX_SAMPLES/2) waveLength = MAX_SAMPLES/2; |
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if (waveLength < 1) waveLength = 1; |
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// Write sine wave |
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for (int i = 0; i < waveLength*2; i++) |
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{ |
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data[i] = (short)(sinf(((2*PI*(float)i/waveLength)))*32000); |
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} |
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// Make sure the rest of the line is flat |
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for (int j = waveLength*2; j < MAX_SAMPLES; j++) |
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{ |
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data[j] = (short)0; |
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} |
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newSineFrequency -= 10; |
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// Scale read cursor's position to minimize transition artifacts |
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//readCursor = (int)(readCursor*((float)waveLength/(float)oldWavelength)); |
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oldFrequency = frequency; |
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if (newSineFrequency < 20) |
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newSineFrequency = 20; |
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} |
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/* |
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// Refill audio stream if required |
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if (IsAudioStreamProcessed(stream)) |
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if (IsKeyDown(KEY_LEFT)) |
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{ |
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// Synthesize a buffer that is exactly the requested size |
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int writeCursor = 0; |
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while (writeCursor < MAX_SAMPLES_PER_UPDATE) |
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{ |
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// Start by trying to write the whole chunk at once |
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int writeLength = MAX_SAMPLES_PER_UPDATE-writeCursor; |
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// Limit to the maximum readable size |
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int readLength = waveLength-readCursor; |
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pan -= 0.01f; |
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SetAudioStreamPan(stream, pan); |
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if (writeLength > readLength) writeLength = readLength; |
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if (pan < -1.0f) |
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pan = -1.0f; |
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} |
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// Write the slice |
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memcpy(writeBuf + writeCursor, data + readCursor, writeLength*sizeof(short)); |
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if (IsKeyDown(KEY_RIGHT)) |
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{ |
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pan += 0.01f; |
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SetAudioStreamPan(stream, pan); |
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// Update cursors and loop audio |
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readCursor = (readCursor + writeLength)%waveLength; |
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if (pan > 1.0f) |
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pan = 1.0f; |
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} |
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writeCursor += writeLength; |
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if (IsAudioStreamProcessed(stream)) |
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{ |
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for (int i = 0; i < BUFFER_SIZE; i++) |
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{ |
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int wavelength = SAMPLE_RATE/sineFrequency; |
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buffer[i] = sin(2*PI*sineIndex/wavelength); |
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sineIndex++; |
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if (sineIndex >= wavelength) |
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{ |
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sineFrequency = newSineFrequency; |
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sineIndex = 0; |
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sineStartTime = GetTime(); |
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} |
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} |
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// Copy finished frame to audio stream |
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UpdateAudioStream(stream, writeBuf, MAX_SAMPLES_PER_UPDATE); |
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UpdateAudioStream(stream, buffer, BUFFER_SIZE); |
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} |
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*/ |
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//---------------------------------------------------------------------------------- |
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// Draw |
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//---------------------------------------------------------------------------------- |
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BeginDrawing(); |
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ClearBackground(RAYWHITE); |
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DrawText(TextFormat("sine frequency: %i",(int)frequency), GetScreenWidth() - 220, 10, 20, RED); |
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DrawText("click mouse button to change frequency or pan", 10, 10, 20, DARKGRAY); |
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// Draw the current buffer state proportionate to the screen |
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for (int i = 0; i < screenWidth; i++) |
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{ |
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position.x = (float)i; |
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position.y = 250 + 50*data[i*MAX_SAMPLES/screenWidth]/32000.0f; |
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DrawPixelV(position, RED); |
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} |
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ClearBackground(RAYWHITE); |
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DrawText(TextFormat("sine frequency: %i", sineFrequency), screenWidth - 220, 10, 20, RED); |
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DrawText(TextFormat("pan: %.2f", pan), screenWidth - 220, 30, 20, RED); |
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DrawText("Up/down to change frequency", 10, 10, 20, DARKGRAY); |
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DrawText("Left/right to pan", 10, 30, 20, DARKGRAY); |
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int windowStart = (GetTime() - sineStartTime)*SAMPLE_RATE; |
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int windowSize = 0.1f*SAMPLE_RATE; |
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int wavelength = SAMPLE_RATE/sineFrequency; |
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// Draw a sine wave with the same frequency as the one being sent to the audio stream |
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for (int i = 0; i < screenWidth; i++) { |
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int t0 = windowStart + i*windowSize/screenWidth; |
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int t1 = windowStart + (i + 1)*windowSize/screenWidth; |
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Vector2 startPos = { i, 250 + 50*sin(2*PI*t0/wavelength) }; |
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Vector2 endPos = { i + 1, 250 + 50*sin(2*PI*t1/wavelength) }; |
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DrawLineV(startPos, endPos, RED); |
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} |
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EndDrawing(); |
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//---------------------------------------------------------------------------------- |
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@ -201,9 +143,6 @@ int main(void) |
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// De-Initialization |
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//-------------------------------------------------------------------------------------- |
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free(data); // Unload sine wave data |
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free(writeBuf); // Unload write buffer |
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UnloadAudioStream(stream); // Close raw audio stream and delete buffers from RAM |
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CloseAudioDevice(); // Close audio device (music streaming is automatically stopped) |
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dan-hoang
4 дні тому
GitHub
