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Added some comments to sample

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Some work still required...
This commit is contained in:
raysan5 2016-12-26 11:46:07 +01:00
parent 5da815234c
commit 3c91dc099d
1 changed files with 11 additions and 8 deletions
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17
examples/audio_raw_stream.c
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@ -17,6 +17,7 @@
#include <math.h> // Required for: sinf() #include <math.h> // Required for: sinf()
#define MAX_SAMPLES 22050 #define MAX_SAMPLES 22050
#define MAX_SAMPLES_PER_UPDATE 4096
int main() int main()
{ {
@ -32,18 +33,17 @@ int main()
// Init raw audio stream (sample rate: 22050, sample size: 16bit-short, channels: 1-mono) // Init raw audio stream (sample rate: 22050, sample size: 16bit-short, channels: 1-mono)
AudioStream stream = InitAudioStream(22050, 16, 1); AudioStream stream = InitAudioStream(22050, 16, 1);
// Fill audio stream with some samples (sine wave) // Generate samples data from sine wave
short *data = (short *)malloc(sizeof(short)*MAX_SAMPLES); short *data = (short *)malloc(sizeof(short)*MAX_SAMPLES);
// TODO: Review data generation, it seems data is discontinued for loop,
// for that reason, there is a clip everytime audio stream is looped...
for (int i = 0; i < MAX_SAMPLES; i++) for (int i = 0; i < MAX_SAMPLES; i++)
{ {
data[i] = (short)(sinf(((2*PI*(float)i)/2)*DEG2RAD)*32000); data[i] = (short)(sinf(((2*PI*(float)i)/2)*DEG2RAD)*32000);
} }
// NOTE: The generated MAX_SAMPLES do not fit to close a perfect loop PlayAudioStream(stream); // Start processing stream buffer (no data loaded currently)
// for that reason, there is a clip everytime audio stream is looped
PlayAudioStream(stream);
int totalSamples = MAX_SAMPLES; int totalSamples = MAX_SAMPLES;
int samplesLeft = totalSamples; int samplesLeft = totalSamples;
@ -60,10 +60,13 @@ int main()
//---------------------------------------------------------------------------------- //----------------------------------------------------------------------------------
// Refill audio stream if required // Refill audio stream if required
// NOTE: Every update we check if stream data has been already consumed and we update
// buffer with new data from the generated samples, we upload data at a rate (MAX_SAMPLES_PER_UPDATE),
// but notice that at some point we update < MAX_SAMPLES_PER_UPDATE data...
if (IsAudioBufferProcessed(stream)) if (IsAudioBufferProcessed(stream))
{ {
int numSamples = 0; int numSamples = 0;
if (samplesLeft >= 4096) numSamples = 4096; if (samplesLeft >= MAX_SAMPLES_PER_UPDATE) numSamples = MAX_SAMPLES_PER_UPDATE;
else numSamples = samplesLeft; else numSamples = samplesLeft;
UpdateAudioStream(stream, data + (totalSamples - samplesLeft), numSamples); UpdateAudioStream(stream, data + (totalSamples - samplesLeft), numSamples);
@ -83,7 +86,7 @@ int main()
DrawText("SINE WAVE SHOULD BE PLAYING!", 240, 140, 20, LIGHTGRAY); DrawText("SINE WAVE SHOULD BE PLAYING!", 240, 140, 20, LIGHTGRAY);
// NOTE: Draw a part of the sine wave (only screen width) // NOTE: Draw a part of the sine wave (only screen width, proportional values)
for (int i = 0; i < GetScreenWidth(); i++) for (int i = 0; i < GetScreenWidth(); i++)
{ {
position.x = i; position.x = i;