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libusb: use alt setting 2 for one 8-bit or 16-bit voice channel

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This commit is contained in:
Matthias Ringwald 2016-01-16 21:49:21 +01:00
parent 800f1352ca
commit d5422c82dc
1 changed files with 6 additions and 5 deletions
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11
platforms/posix/src/hci_transport_h2_libusb.c
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@ -65,8 +65,6 @@
#include "hci.h"
#include "hci_transport.h"
// #define HAVE_SCO
#if (USB_VENDOR_ID != 0) && (USB_PRODUCT_ID != 0)
#define HAVE_USB_VENDOR_ID_AND_PRODUCT_ID
#endif
@ -150,9 +148,10 @@ static int acl_out_addr;
static int sco_in_addr;
static int sco_out_addr;
// outgoing SCO packets (4 > 2, 64 is size of SCO buffer in PTS Dongle)
// Outgoing SCO packet queue
// 49 bytes is the max usb packet size for alternate setting 5 (3 8-bit channels or 1 8-bit and 1 16-bit channel)
// simplified ring buffer implementation
#define SCO_RING_PACKET_SIZE (64)
#define SCO_RING_PACKET_SIZE (49)
#define SCO_RING_BUFFER_COUNT (8)
#define SCO_RING_BUFFER_SIZE (SCO_RING_BUFFER_COUNT * SCO_RING_PACKET_SIZE)
@ -603,14 +602,16 @@ static int prepare_device(libusb_device_handle * aHandle){
libusb_close(aHandle);
return r;
}
//
// Bluetooth USB Transprot Alternate Settings:
//
// 0: No active voice channels (for USB compliance)
// 1: One 8 kHz voice channel with 8-bit encoding
// 2: Two 8 kHz voice channels with 8-bit encoding or one 8 kHz voice channel with 16-bit encoding
// 3: Three 8 kHz voice channels with 8-bit encoding
// 4: Two 8 kHz voice channels with 16-bit encoding or one 16 kHz voice channel with 16-bit encoding
// 5: Three 8 kHz voice channels with 16-bit encoding or one 8 kHz voice channel with 16-bit encoding and one 16 kHz voice channel with 16-bit encoding
int alt_setting = 1;
int alt_setting = 2; // <-- we support only a single SCO connection
log_info("Switching to setting %u on interface 1..", alt_setting);
r = libusb_set_interface_alt_setting(aHandle, 1, alt_setting);
if (r < 0) {