static void bt_av_hdl_a2d_evt(uint16_t event, void *p_param)
{
ESP_LOGD(BT_AV_TAG, "%s evt %d", __func__, event);
esp_a2d_cb_param_t *a2d = NULL;
switch (event) {
case ESP_A2D_CONNECTION_STATE_EVT: {
a2d = (esp_a2d_cb_param_t *)(p_param);
ESP_LOGI(BT_AV_TAG, "a2dp conn_state_cb, state %d", a2d->conn_stat.state);
break;
}
case ESP_A2D_AUDIO_STATE_EVT: {
a2d = (esp_a2d_cb_param_t *)(p_param);
ESP_LOGI(BT_AV_TAG, "a2dp audio_state_cb state %d", a2d->audio_stat.state);
m_audio_state = a2d->audio_stat.state;
if (ESP_A2D_AUDIO_STATE_STARTED == a2d->audio_stat.state) {
m_pkt_cnt = 0;
}
break;
}
case ESP_A2D_AUDIO_CFG_EVT: {
a2d = (esp_a2d_cb_param_t *)(p_param);
ESP_LOGI(BT_AV_TAG, "a2dp audio_cfg_cb , codec type %d", a2d->audio_cfg.mcc.type);
// for now only SBC stream is supported
if (a2d->audio_cfg.mcc.type == ESP_A2D_MCT_SBC) {
int sample_rate = 16000;
char oct0 = a2d->audio_cfg.mcc.cie.sbc[0];
if (oct0 & (0x01 << 6)) {
sample_rate = 32000;
} else if (oct0 & (0x01 << 5)) {
sample_rate = 44100;
} else if (oct0 & (0x01 << 4)) {
sample_rate = 48000;
}
i2s_set_clk(0, sample_rate, 16, 2);
ESP_LOGI(BT_AV_TAG, "configure audio player %x-%x-%x-%x\n",
a2d->audio_cfg.mcc.cie.sbc[0],
a2d->audio_cfg.mcc.cie.sbc[1],
a2d->audio_cfg.mcc.cie.sbc[2],
a2d->audio_cfg.mcc.cie.sbc[3]);
ESP_LOGI(BT_AV_TAG, "audio player configured, samplerate=%d", sample_rate);
}
break;
}
default:
ESP_LOGE(BT_AV_TAG, "%s unhandled evt %d", __func__, event);
break;
}
}
static void setup_triangle_sine_waves(int bits)
{
int *samples_data = malloc(((bits+8)/16)*SAMPLE_PER_CYCLE*4);
unsigned int i, sample_val;
double sin_float, triangle_float, triangle_step = (double) pow(2, bits) / SAMPLE_PER_CYCLE;
size_t i2s_bytes_write = 0;
printf("\r\nTest bits=%d free mem=%d, written data=%d\n", bits, esp_get_free_heap_size(), ((bits+8)/16)*SAMPLE_PER_CYCLE*4);
triangle_float = -(pow(2, bits)/2 - 1);
for(i = 0; i < SAMPLE_PER_CYCLE; i++) {
sin_float = sin(i * PI / 180.0);
if(sin_float >= 0)
triangle_float += triangle_step;
else
triangle_float -= triangle_step;
sin_float *= (pow(2, bits)/2 - 1);
if (bits == 16) {
sample_val = 0;
sample_val += (short)triangle_float;
sample_val = sample_val << 16;
sample_val += (short) sin_float;
samples_data[i] = sample_val;
} else if (bits == 24) { //1-bytes unused
samples_data[i*2] = ((int) triangle_float) << 8;
samples_data[i*2 + 1] = ((int) sin_float) << 8;
} else {
samples_data[i*2] = ((int) triangle_float);
samples_data[i*2 + 1] = ((int) sin_float);
}
}
i2s_set_clk(I2S_NUM, SAMPLE_RATE, bits, 2);
//Using push
// for(i = 0; i < SAMPLE_PER_CYCLE; i++) {
// if (bits == 16)
// i2s_push_sample(0, &samples_data[i], 100);
// else
// i2s_push_sample(0, &samples_data[i*2], 100);
// }
// or write
i2s_write(I2S_NUM, samples_data, ((bits+8)/16)*SAMPLE_PER_CYCLE*4, &i2s_bytes_write, 100);
free(samples_data);
}
