My project base on NCS V2.2.0.BIS mode,gateway
My "AUDIO FRAME DURATION" is 10ms.But my audio source is not i2s or usb.
My audio come from uart,1M bit/s.It will take 2-3ms.
and Lc3 encode take 5-6 ms.then time is not enough.
Can I modify this:AUDIO_FRAME_DURATION_US(I tried ,but failed),or an I reduce LC3 encode time.
any advice will be helpful.
1.
static void encoder_thread(void *arg1, void *arg2, void *arg3)
{
int ret;
uint32_t blocks_alloced_num;
uint32_t blocks_locked_num;
int debug_trans_count = 0;
size_t encoded_data_size = 0;
void *tmp_pcm_raw_data[CONFIG_FIFO_FRAME_SPLIT_NUM];
char pcm_raw_data[FRAME_SIZE_BYTES];
static uint8_t *encoded_data;
static size_t pcm_block_size;
static uint32_t test_tone_finite_pos;
while (1) {
/* Get PCM data from I2S */
/* Since one audio frame is divided into a number of
* blocks, we need to fetch the pointers to all of these
* blocks before copying it to a continuous area of memory
* before sending it to the encoder
*/
for (int i = 0; i < CONFIG_FIFO_FRAME_SPLIT_NUM; i++) {
ret = data_fifo_pointer_last_filled_get(&fifo_rx, &tmp_pcm_raw_data[i],
&pcm_block_size, K_FOREVER);
ERR_CHK(ret);
memcpy(pcm_raw_data + (i * BLOCK_SIZE_BYTES), tmp_pcm_raw_data[i],
pcm_block_size);
data_fifo_block_free(&fifo_rx, &tmp_pcm_raw_data[i]);
}
IO_invert();
if (sw_codec_cfg.encoder.enabled) {
if (test_tone_size) {
/* Test tone takes over audio stream */
uint32_t num_bytes;
char tmp[FRAME_SIZE_BYTES / 2];
ret = contin_array_create(tmp, FRAME_SIZE_BYTES / 2, test_tone_buf,
test_tone_size, &test_tone_finite_pos);
ERR_CHK(ret);
ret = pscm_copy_pad(tmp, FRAME_SIZE_BYTES / 2,
CONFIG_AUDIO_BIT_DEPTH_BITS, pcm_raw_data,
&num_bytes);
ERR_CHK(ret);
}
ret = sw_codec_encode(pcm_raw_data, FRAME_SIZE_BYTES, &encoded_data,
&encoded_data_size);
ERR_CHK_MSG(ret, "Encode failed");
}
/* Print block usage */
if (debug_trans_count == DEBUG_INTERVAL_NUM) {
ret = data_fifo_num_used_get(&fifo_rx, &blocks_alloced_num,
&blocks_locked_num);
ERR_CHK(ret);
LOG_DBG(COLOR_CYAN "RX alloced: %d, locked: %d" COLOR_RESET,
blocks_alloced_num, blocks_locked_num);
debug_trans_count = 0;
} else {
debug_trans_count++;
}
if (sw_codec_cfg.encoder.enabled) {
/* Send encoded data over IPM */
streamctrl_encoded_data_send(encoded_data, encoded_data_size);
}
IO_invert();
STACK_USAGE_PRINT("encoder_thread", &encoder_thread_data);
}
}
line 33 and line 72.IO invert,take about 6ms
2.I mean hardware codec.