255 lines
No EOL
9.9 KiB
C
255 lines
No EOL
9.9 KiB
C
/*******************************************************************************************
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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 6.0
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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 <stdlib.h> // Required for: malloc(), free()
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#include <math.h> // Required for: sinf()
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enum Flags { FLAG_CHANNEL_MONO = 1u<<0, FLAG_SAMPLESIZE_SHORT = 1u<<1 };
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static unsigned int gflags = FLAG_CHANNEL_MONO | FLAG_SAMPLESIZE_SHORT; // mono + 16-bit to match initial stream specs
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#define CHANNEL_MONO() ((gflags & FLAG_CHANNEL_MONO) != 0)
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#define SAMPLESIZE_SHORT() ((gflags & FLAG_SAMPLESIZE_SHORT) != 0)
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#define TOGGLE(K, F) do { if (IsKeyPressed(K)) { gflags ^= (F); } } while (0)
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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 AudioInputCallbackMonoShort(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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void AudioInputCallbackStereoShort(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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short s = (short)(32000.0f*sinf(2*PI*sineIdx));
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d[2*i + 0] = s; // L
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d[2*i + 1] = s; // R
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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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void AudioInputCallbackMonoFloat(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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float *d = (float *)buffer;
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for (unsigned int i = 0; i < frames; i++)
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{
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d[i] = 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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void AudioInputCallbackStereoFloat(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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float *d = (float *)buffer;
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for (unsigned int i = 0; i < frames; i++)
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{
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float s = sinf(2*PI*sineIdx);
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d[2*i + 0] = s;
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d[2*i + 1] = s;
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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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//------------------------------------------------------------------------------------
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// Program main entry point
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//------------------------------------------------------------------------------------
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int main(void)
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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const int screenWidth = 800;
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const int screenHeight = 450;
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InitWindow(screenWidth, screenHeight, "raylib [audio] example - raw stream with callbacks");
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InitAudioDevice(); // Initialize audio device
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SetAudioStreamBufferSizeDefault(MAX_SAMPLES_PER_UPDATE);
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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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SetAudioStreamCallback(stream, AudioInputCallbackMonoShort);
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unsigned int previousSampleSize = stream.sampleSize;
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unsigned int previousChannels = stream.channels;
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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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// 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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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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TOGGLE(KEY_M, FLAG_CHANNEL_MONO);
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TOGGLE(KEY_F, FLAG_SAMPLESIZE_SHORT);
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unsigned int nextSampleSize = (SAMPLESIZE_SHORT())? 16u : 32u;
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unsigned int nextChannels = (CHANNEL_MONO())? 1u : 2u;
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if (nextSampleSize != previousSampleSize || nextChannels != previousChannels)
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{
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StopAudioStream(stream);
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UnloadAudioStream(stream);
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stream = LoadAudioStream(44100, nextSampleSize, nextChannels);
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// CORRECT ALIGNMENT
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if (nextChannels == 1 && nextSampleSize == 16) SetAudioStreamCallback(stream, AudioInputCallbackMonoShort);
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if (nextChannels == 2 && nextSampleSize == 16) SetAudioStreamCallback(stream, AudioInputCallbackStereoShort);
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if (nextChannels == 1 && nextSampleSize == 32) SetAudioStreamCallback(stream, AudioInputCallbackMonoFloat);
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if (nextChannels == 2 && nextSampleSize == 32) SetAudioStreamCallback(stream, AudioInputCallbackStereoFloat);
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// INCORRECT ALIGNMENT TESTS: comment and uncomment or add your own to observe common misconfigurations
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// if (nextChannels == 1 && nextSampleSize == 16) SetAudioStreamCallback(stream, AudioInputCallbackStereoShort);
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// if (nextChannels == 1 && nextSampleSize == 32) SetAudioStreamCallback(stream, AudioInputCallbackMonoShort);
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// if (nextChannels == 2 && nextSampleSize == 32) SetAudioStreamCallback(stream, AudioInputCallbackMonoShort);
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// if (nextChannels == 2 && nextSampleSize == 16) SetAudioStreamCallback(stream, AudioInputCallbackMonoFloat);
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// if (nextChannels == 2 && nextSampleSize == 16) SetAudioStreamCallback(stream, AudioInputCallbackStereoFloat);
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PlayAudioStream(stream);
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previousSampleSize = nextSampleSize;
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previousChannels = nextChannels;
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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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{
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float fp = (float)(mousePosition.y);
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frequency = 40.0f + (float)(fp);
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float pan = (float)(mousePosition.x)/(float)screenWidth;
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SetAudioStreamPan(stream, pan);
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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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{
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// Compute wavelength. Limit size in both directions
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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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oldFrequency = frequency;
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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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DrawText("press M to SWAP channels [ M ]:", 250, 366, 20, BLUE);
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DrawText((CHANNEL_MONO())? "MONO" : "STEREO", 600, 366, 20, (CHANNEL_MONO())? GREEN : RED);
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DrawText("press F to SWAP Sample Size [ F ]:", 250, 400, 20, BLUE);
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DrawText((SAMPLESIZE_SHORT())? "16" : "32", 620, 400, 20, (SAMPLESIZE_SHORT())? GREEN : RED);
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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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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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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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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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} |