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Add 24bit loopback in example.

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This commit is contained in:
MasterPhi 2021-07-01 11:39:15 +02:00
parent 204f3152cb
commit 5b7795be4b
3 changed files with 54 additions and 13 deletions
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58
examples/device/uac2_headset/src/main.c
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@ -38,7 +38,7 @@
const uint32_t sample_rates[] = {44100, 48000, 88200, 96000};
uint32_t current_sample_rate = 44100;
#define N_SAMPLE_RATES (sizeof(sample_rates) / 4)
#define N_SAMPLE_RATES TU_ARRAY_SIZE(sample_rates)
/* Blink pattern
* - 25 ms : streaming data
@ -78,11 +78,16 @@ int8_t mute[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX + 1]; // +1 for master chan
int16_t volume[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX + 1]; // +1 for master channel 0
// Buffer for microphone data
int16_t mic_buf[1000];
uint8_t mic_buf[CFG_TUD_AUDIO_FUNC_1_EP_OUT_SW_BUF_SZ];
// Buffer for speaker data
int16_t spk_buf[1000];
uint8_t spk_buf[CFG_TUD_AUDIO_FUNC_1_EP_OUT_SW_BUF_SZ];
// Speaker data size received in the last frame
int spk_data_size;
// Resolution per format
const uint8_t resolutions_per_format[CFG_TUD_AUDIO_FUNC_1_N_FORMATS] = {CFG_TUD_AUDIO_FUNC_1_FORMAT_1_RESOLUTION_RX,
CFG_TUD_AUDIO_FUNC_1_FORMAT_2_RESOLUTION_RX};
// Current resolution, update on format change
uint8_t current_resolution;
void led_blinking_task(void);
void audio_task(void);
@ -364,6 +369,13 @@ bool tud_audio_set_itf_cb(uint8_t rhport, tusb_control_request_t const * p_reque
if (ITF_NUM_AUDIO_STREAMING_SPK == itf && alt != 0)
blink_interval_ms = BLINK_STREAMING;
// Clear buffer when streaming format is changed
spk_data_size = 0;
if(alt != 0)
{
current_resolution = resolutions_per_format[alt-1];
}
return true;
}
@ -397,20 +409,40 @@ void audio_task(void)
{
// When new data arrived, copy data from speaker buffer, to microphone buffer
// and send it over
// Only support speaker & headphone both have the same resolution
// If one is 16bit another is 24bit be care of LOUD noise !
if (spk_data_size)
{
int16_t *src = spk_buf;
int16_t *limit = spk_buf + spk_data_size / 2;
int16_t *dst = mic_buf;
while (src < limit)
if (current_resolution == 16)
{
// Combine two channels into one
int32_t left = *src++;
int32_t right = *src++;
*dst++ = (int16_t)((left + right) / 2);
int16_t *src = (int16_t*)spk_buf;
int16_t *limit = (int16_t*)spk_buf + spk_data_size / 2;
int16_t *dst = (int16_t*)mic_buf;
while (src < limit)
{
// Combine two channels into one
int32_t left = *src++;
int32_t right = *src++;
*dst++ = (int16_t)((left + right) / 2);
}
tud_audio_write((uint8_t *)mic_buf, spk_data_size / 2);
spk_data_size = 0;
}
else if (current_resolution == 24)
{
int32_t *src = (int32_t*)spk_buf;
int32_t *limit = (int32_t*)spk_buf + spk_data_size / 4;
int32_t *dst = (int32_t*)mic_buf;
while (src < limit)
{
// Combine two channels into one
int32_t left = (*src++);
int32_t right = (*src++);
*dst++ = (int32_t)((left + right) / 2) & 0xffffff00;
}
tud_audio_write((uint8_t *)mic_buf, spk_data_size / 2);
spk_data_size = 0;
}
tud_audio_write((uint8_t *)mic_buf, spk_data_size / 2);
spk_data_size = 0;
}
}

3
examples/device/uac2_headset/src/tusb_config.h
View File

@ -96,6 +96,9 @@ extern "C" {
#define CFG_TUD_AUDIO_FUNC_1_DESC_LEN TUD_AUDIO_HEADSET_STEREO_DESC_LEN
// How many formats are used, need to adjust USB descriptor if changed
#define CFG_TUD_AUDIO_FUNC_1_N_FORMATS 2
// Audio format type I specifications
#define CFG_TUD_AUDIO_FUNC_1_MAX_SAMPLE_RATE 96000 // 24bit/96kHz is the best quality for full-speed, high-speed is needed beyond this
#define CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX 1

6
examples/device/uac2_headset/src/usb_descriptors.h
View File

@ -55,23 +55,29 @@ enum
+ TUD_AUDIO_DESC_OUTPUT_TERM_LEN\
+ TUD_AUDIO_DESC_INPUT_TERM_LEN\
+ TUD_AUDIO_DESC_OUTPUT_TERM_LEN\
/* Interface 1, Alternate 0 */\
+ TUD_AUDIO_DESC_STD_AS_INT_LEN\
/* Interface 1, Alternate 0 */\
+ TUD_AUDIO_DESC_STD_AS_INT_LEN\
+ TUD_AUDIO_DESC_CS_AS_INT_LEN\
+ TUD_AUDIO_DESC_TYPE_I_FORMAT_LEN\
+ TUD_AUDIO_DESC_STD_AS_ISO_EP_LEN\
+ TUD_AUDIO_DESC_CS_AS_ISO_EP_LEN\
/* Interface 1, Alternate 2 */\
+ TUD_AUDIO_DESC_STD_AS_INT_LEN\
+ TUD_AUDIO_DESC_CS_AS_INT_LEN\
+ TUD_AUDIO_DESC_TYPE_I_FORMAT_LEN\
+ TUD_AUDIO_DESC_STD_AS_ISO_EP_LEN\
+ TUD_AUDIO_DESC_CS_AS_ISO_EP_LEN\
/* Interface 2, Alternate 0 */\
+ TUD_AUDIO_DESC_STD_AS_INT_LEN\
/* Interface 2, Alternate 1 */\
+ TUD_AUDIO_DESC_STD_AS_INT_LEN\
+ TUD_AUDIO_DESC_CS_AS_INT_LEN\
+ TUD_AUDIO_DESC_TYPE_I_FORMAT_LEN\
+ TUD_AUDIO_DESC_STD_AS_ISO_EP_LEN\
+ TUD_AUDIO_DESC_CS_AS_ISO_EP_LEN\
/* Interface 2, Alternate 2 */\
+ TUD_AUDIO_DESC_STD_AS_INT_LEN\
+ TUD_AUDIO_DESC_CS_AS_INT_LEN\
+ TUD_AUDIO_DESC_TYPE_I_FORMAT_LEN\