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libusb: pick alt setting based on voice settings/num connections

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This commit is contained in:
Matthias Ringwald 2017-01-19 18:10:47 +01:00
parent 2117d3a5b1
commit c6f9dc916d
1 changed files with 18 additions and 5 deletions
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23
platform/libusb/hci_transport_h2_libusb.c
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@ -87,6 +87,10 @@
// --> support only a single SCO connection
#define ALT_SETTING (1)
// alt setting for 1-3 connections and 8/16 bit
static const int alt_setting_8_bit[] = {1,2,3};
static const int alt_setting_16_bit[] = {2,4,5};
// for ALT_SETTING >= 1 and 8-bit channel, we need the following isochronous packets
// One complete SCO packet with 24 frames every 3 frames (== 3 ms)
#define NUM_ISO_PACKETS (3)
@ -788,10 +792,19 @@ static int usb_sco_start(void){
sco_state_machine_init();
sco_ring_init();
log_info("Switching to setting %u on interface 1..", ALT_SETTING);
int r = libusb_set_interface_alt_setting(handle, 1, ALT_SETTING);
int alt_setting;
if (sco_voice_setting & 0x0020){
// 16-bit PCM
alt_setting = alt_setting_16_bit[sco_num_connections-1];
} else {
// 8-bit PCM or mSBC
alt_setting = alt_setting_8_bit[sco_num_connections-1];
}
log_info("Switching to setting %u on interface 1..", alt_setting);
int r = libusb_set_interface_alt_setting(handle, 1, alt_setting);
if (r < 0) {
log_error("Error setting alternative setting %u for interface 1: %s\n", ALT_SETTING, libusb_error_name(r));
log_error("Error setting alternative setting %u for interface 1: %s\n", alt_setting, libusb_error_name(r));
return r;
}
@ -1290,17 +1303,17 @@ static int usb_send_packet(uint8_t packet_type, uint8_t * packet, int size){
#ifdef ENABLE_SCO_OVER_HCI
static void usb_set_sco_config(uint16_t voice_setting, int num_connections){
log_info("usb_set_sco_config: voice settings 0x04%x, num connections %u", voice_setting, num_connections);
log_info("usb_set_sco_config: voice settings 0x%04x, num connections %u", voice_setting, num_connections);
if (num_connections != sco_num_connections){
sco_voice_setting = voice_setting;
if (sco_num_connections){
usb_sco_stop();
}
sco_num_connections = num_connections;
if (num_connections){
usb_sco_start();
}
sco_num_connections = num_connections;
}
}
#endif