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hci: improve sco send without sco flow control for smaller packets

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This commit is contained in:
Matthias Ringwald 2025-02-26 18:22:47 +01:00
parent 2332f233d7
commit 96627858b8
2 changed files with 21 additions and 3 deletions
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1
CHANGELOG.md
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@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
### Changed
- HCI: hci_request_cis_can_send_now_events for CIG in Central role will emit can send now events for all streams in group
- HCI: improve sco send without sco flow control for smaller packets
- GAP: validate params in gap_set_scan_params
- HID Host: emit HID_SUBEVENT_INCOMING_CONNECTION if memory allocation fails
- BTstack HID: remove HID_PROTOCOL_MODE_REPORT_WITH_FALLBACK_TO_BOOT

23
src/hci.c
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@ -4805,8 +4805,17 @@ static void sco_handler(uint8_t * packet, uint16_t size){
} else {
// log_debug("sco flow %u, handle 0x%04x, packets sent %u, bytes send %u", hci_stack->synchronous_flow_control_enabled, (int) con_handle, conn->num_packets_sent, conn->num_sco_bytes_sent);
if (hci_stack->synchronous_flow_control_enabled == 0){
// get multiplier 2 for CVSD (16-bit samples) and 1 for mSBC (8-bit datq)
int multiplier;
if (((hci_stack->sco_voice_setting_active & 0x03) != 0x03) &&
((hci_stack->sco_voice_setting_active & 0x20) == 0x20)) {
multiplier = 2;
} else {
multiplier = 1;
}
// ignore received SCO packets for the first 10 ms, then allow for max two HCI_SCO_2EV3_SIZE packets
uint8_t max_sco_packets = (uint8_t) btstack_min(2 * HCI_SCO_2EV3_SIZE / conn->sco_payload_length, hci_stack->sco_packets_total_num);
uint8_t max_sco_packets = (uint8_t) btstack_min(2 * multiplier * HCI_SCO_2EV3_SIZE / conn->sco_payload_length, hci_stack->sco_packets_total_num);
if (conn->sco_tx_active == 0){
if (btstack_time_delta(btstack_run_loop_get_time_ms(), conn->sco_established_ms) > 10){
conn->sco_tx_active = 1;
@ -4815,8 +4824,16 @@ static void sco_handler(uint8_t * packet, uint16_t size){
hci_notify_if_sco_can_send_now();
}
} else {
if (conn->sco_tx_ready < max_sco_packets){
conn->sco_tx_ready++;
// calculate how many packets can be sent for one received one
// - remove sco header and multiplier
// - divide by acutal payload length
// - avoid overrun
int received_payload_len = (size - 3) / multiplier;
int new_credits = received_payload_len / conn->sco_payload_length;
if ((conn->sco_tx_ready + new_credits)< max_sco_packets){
conn->sco_tx_ready += new_credits;
} else {
conn->sco_tx_ready = max_sco_packets;
}
hci_notify_if_sco_can_send_now();
}