41 lines
1.0 KiB
C++
41 lines
1.0 KiB
C++
// Playback example with the USBAUDIO library
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#include "mbed.h"
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#include "USBAudio.h"
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// frequency: 48 kHz
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#define FREQ_SPK 48000
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#define FREQ_MIC 48000
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// 2channels: stereo
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#define NB_CHA_SPK 2
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#define NB_CHA_MIC 2
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// length computed: each ms, we receive 48 * 16bits ->48 * 2 bytes. as there are two channels, the length will be 48 * 2 * 2
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#define LENGTH_AUDIO_PACKET_SPK (FREQ_SPK / 500) * NB_CHA_SPK
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#define LENGTH_AUDIO_PACKET_MIC (FREQ_MIC / 500) * NB_CHA_MIC
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// USBAudio object
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USBAudio audio(FREQ_SPK, NB_CHA_SPK, FREQ_MIC, NB_CHA_MIC, 0xab45, 0x0378);
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int main() {
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// buffer of int
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int buf_in[LENGTH_AUDIO_PACKET_SPK/sizeof(int)];
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int buf_out[LENGTH_AUDIO_PACKET_MIC/sizeof(int)];
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int * stream_out = buf_in;
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int * stream_in = buf_out;
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int * tmp = NULL;
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while (1) {
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// read and write one audio packet each frame
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audio.readWrite((uint8_t *)stream_in, (uint8_t *)stream_out);
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// swap the buffers
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tmp = stream_in;
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stream_in = stream_out;
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stream_out = tmp;
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}
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}
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