Philips Philips / Mbed 2 deprecated reverseeffectsguitarspeech1

I am so cool I did it all by myself lol (.)(.) Hello my name is guitar reverse me and it is karaoke time

main.cpp@0:daed8a07b96d, 2011-05-30 (annotated)

Committer:
mbed2f
Date:
Mon May 30 15:19:53 2011 +0000
Revision:
0:daed8a07b96d
I am so cool I did it all by myself lol (.)(.)



Hello my name is guitar reverse me and it is karaoke time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed2f 0:daed8a07b96d 1 //Edited out Buffer[Index] = ReadSample += mic.read_u16(); up to you which one you use both work
mbed2f 0:daed8a07b96d 2
mbed2f 0:daed8a07b96d 3 #include <mbed.h>
mbed2f 0:daed8a07b96d 4
mbed2f 0:daed8a07b96d 5 // Boolean types
mbed2f 0:daed8a07b96d 6 #define TRUE 1
mbed2f 0:daed8a07b96d 7 #define FALSE 0
mbed2f 0:daed8a07b96d 8
mbed2f 0:daed8a07b96d 9 //#define NUM_SAMPLES 48000
mbed2f 0:daed8a07b96d 10 /* ADC for the microphone/input, DAC for the speaker/output */
mbed2f 0:daed8a07b96d 11 AnalogIn mic(p19);
mbed2f 0:daed8a07b96d 12 AnalogOut speaker(p18);
mbed2f 0:daed8a07b96d 13
mbed2f 0:daed8a07b96d 14 // Allocate a buffer to be used for the audio recording
mbed2f 0:daed8a07b96d 15 static const size_t BufferSize = 10 * 1024;
mbed2f 0:daed8a07b96d 16 static unsigned short Buffer[BufferSize];
mbed2f 0:daed8a07b96d 17 // int16_t Buffer[5000];
mbed2f 0:daed8a07b96d 18 //unsigned short Buffer[NUM_SAMPLES];
mbed2f 0:daed8a07b96d 19
mbed2f 0:daed8a07b96d 20
mbed2f 0:daed8a07b96d 21 int main(void)
mbed2f 0:daed8a07b96d 22 {
mbed2f 0:daed8a07b96d 23
mbed2f 0:daed8a07b96d 24 //int i;
mbed2f 0:daed8a07b96d 25 // for (i = 0; ; )
mbed2f 0:daed8a07b96d 26
mbed2f 0:daed8a07b96d 27 { unsigned short ReadSample = 0xFFFF;
mbed2f 0:daed8a07b96d 28 // Indices to track where the playback and recording should take place in the
mbed2f 0:daed8a07b96d 29 // audio buffer. The recording can occur one sample behind the current playback
mbed2f 0:daed8a07b96d 30 // index since it is no longer required.
mbed2f 0:daed8a07b96d 31 int Index = 0;
mbed2f 0:daed8a07b96d 32 // Reverse the direction the buffer is walked between each iteration to save memory
mbed2f 0:daed8a07b96d 33 int Direction = 1;
mbed2f 0:daed8a07b96d 34 // Have audio to playback
mbed2f 0:daed8a07b96d 35 int Playback = FALSE;
mbed2f 0:daed8a07b96d 36 // The amount of data to be recorded before starting reverse playback
mbed2f 0:daed8a07b96d 37 // NOTE: Probably want this to be configured at runtime via a knob, etc.
mbed2f 0:daed8a07b96d 38 int ChunkSize = 9024;
mbed2f 0:daed8a07b96d 39
mbed2f 0:daed8a07b96d 40 // Infinite loop of recording and reverse playback
mbed2f 0:daed8a07b96d 41 for (;;)
mbed2f 0:daed8a07b96d 42 {
mbed2f 0:daed8a07b96d 43 unsigned short PlaySample;
mbed2f 0:daed8a07b96d 44
mbed2f 0:daed8a07b96d 45 // Read out the sample from the buffer to be played back
mbed2f 0:daed8a07b96d 46 if (Playback)
mbed2f 0:daed8a07b96d 47 {
mbed2f 0:daed8a07b96d 48 PlaySample = Buffer[Index];
mbed2f 0:daed8a07b96d 49 speaker.write_u16(PlaySample);
mbed2f 0:daed8a07b96d 50 // i = (i+0) % NUM_SAMPLES;
mbed2f 0:daed8a07b96d 51
mbed2f 0:daed8a07b96d 52 //wait(0.2f);
mbed2f 0:daed8a07b96d 53 }
mbed2f 0:daed8a07b96d 54
mbed2f 0:daed8a07b96d 55 // Obtain current audio sample from the A/D converter.
mbed2f 0:daed8a07b96d 56 // NOTE: I am just faking these values in this sample with an incrementing value
mbed2f 0:daed8a07b96d 57 ReadSample = mic.read_u16();
mbed2f 0:daed8a07b96d 58
mbed2f 0:daed8a07b96d 59 // Record the sample into the buffer right where a space was freed up from the PlaySample read above
mbed2f 0:daed8a07b96d 60 //Buffer[Index] = ReadSample += mic.read_u16();
mbed2f 0:daed8a07b96d 61 Buffer[Index] = ReadSample;
mbed2f 0:daed8a07b96d 62
mbed2f 0:daed8a07b96d 63 // Increment the buffer pointer
mbed2f 0:daed8a07b96d 64 Index += Direction;
mbed2f 0:daed8a07b96d 65
mbed2f 0:daed8a07b96d 66 // Check to see if the chunk has been filled
mbed2f 0:daed8a07b96d 67 if (Index < 0)
mbed2f 0:daed8a07b96d 68 {
mbed2f 0:daed8a07b96d 69 // Now have a chunk to be played back
mbed2f 0:daed8a07b96d 70 Playback = TRUE;
mbed2f 0:daed8a07b96d 71 // Reverse the direction of playback and recording
mbed2f 0:daed8a07b96d 72 Direction *= -1;
mbed2f 0:daed8a07b96d 73 Index = 0;
mbed2f 0:daed8a07b96d 74 }
mbed2f 0:daed8a07b96d 75 else if (Index >= ChunkSize)
mbed2f 0:daed8a07b96d 76 {
mbed2f 0:daed8a07b96d 77 // Now have a chunk to be played back
mbed2f 0:daed8a07b96d 78 Playback = TRUE;
mbed2f 0:daed8a07b96d 79 // Reverse the direction of playback and recording
mbed2f 0:daed8a07b96d 80 Direction *= -1;
mbed2f 0:daed8a07b96d 81 Index = ChunkSize - 1;
mbed2f 0:daed8a07b96d 82 }
mbed2f 0:daed8a07b96d 83 }
mbed2f 0:daed8a07b96d 84 }
mbed2f 0:daed8a07b96d 85 }