自学教程：C++ usb_endpoint_is_isoc_out函数代码示例

static inline int __set_isoc_interface(struct hci_dev *hdev, int altsetting){	struct btusb_data *data = hdev->driver_data;	struct usb_interface *intf = data->isoc;	struct usb_endpoint_descriptor *ep_desc;	int i, err;	if (!data->isoc)		return -ENODEV;	err = usb_set_interface(data->udev, 1, altsetting);	if (err < 0) {		BT_ERR("%s setting interface failed (%d)", hdev->name, -err);		return err;	}	data->isoc_altsetting = altsetting;	data->isoc_tx_ep = NULL;	data->isoc_rx_ep = NULL;	for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {		ep_desc = &intf->cur_altsetting->endpoint[i].desc;		if (!data->isoc_tx_ep && usb_endpoint_is_isoc_out(ep_desc)) {			data->isoc_tx_ep = ep_desc;			continue;		}		if (!data->isoc_rx_ep && usb_endpoint_is_isoc_in(ep_desc)) {			data->isoc_rx_ep = ep_desc;			continue;		}	}	if (!data->isoc_tx_ep || !data->isoc_rx_ep) {		BT_ERR("%s invalid SCO descriptors", hdev->name);		return -ENODEV;	}	return 0;}

static void find_usb_pipe(struct baseband_usb *usb){	struct usb_device *usbdev = usb->usb.device;	struct usb_interface *intf = usb->usb.interface;	unsigned char numendpoint = intf->cur_altsetting->desc.bNumEndpoints;	struct usb_host_endpoint *endpoint = intf->cur_altsetting->endpoint;	unsigned char n;	for (n = 0; n < numendpoint; n++) {		if (usb_endpoint_is_isoc_in(&endpoint[n].desc)) {			pr_debug("endpoint[%d] isochronous in/n", n);			usb->usb.pipe.isoch.in = usb_rcvisocpipe(usbdev,				endpoint[n].desc.bEndpointAddress);		} else if (usb_endpoint_is_isoc_out(&endpoint[n].desc)) {			pr_debug("endpoint[%d] isochronous out/n", n);			usb->usb.pipe.isoch.out = usb_sndisocpipe(usbdev,				endpoint[n].desc.bEndpointAddress);		} else if (usb_endpoint_is_bulk_in(&endpoint[n].desc)) {			pr_debug("endpoint[%d] bulk in/n", n);			usb->usb.pipe.bulk.in = usb_rcvbulkpipe(usbdev,				endpoint[n].desc.bEndpointAddress);		} else if (usb_endpoint_is_bulk_out(&endpoint[n].desc)) {			pr_debug("endpoint[%d] bulk out/n", n);			usb->usb.pipe.bulk.out = usb_sndbulkpipe(usbdev,				endpoint[n].desc.bEndpointAddress);		} else if (usb_endpoint_is_int_in(&endpoint[n].desc)) {			pr_debug("endpoint[%d] interrupt in/n", n);			usb->usb.pipe.interrupt.in = usb_rcvintpipe(usbdev,				endpoint[n].desc.bEndpointAddress);		} else if (usb_endpoint_is_int_out(&endpoint[n].desc)) {			pr_debug("endpoint[%d] interrupt out/n", n);			usb->usb.pipe.interrupt.out = usb_sndintpipe(usbdev,				endpoint[n].desc.bEndpointAddress);		} else {			pr_debug("endpoint[%d] skipped/n", n);		}	}}

static int detect_usb_format(struct ua101 *ua){	const struct uac_format_type_i_discrete_descriptor *fmt_capture;	const struct uac_format_type_i_discrete_descriptor *fmt_playback;	const struct usb_endpoint_descriptor *epd;	unsigned int rate2;	fmt_capture = find_format_descriptor(ua->intf[INTF_CAPTURE]);	fmt_playback = find_format_descriptor(ua->intf[INTF_PLAYBACK]);	if (!fmt_capture || !fmt_playback)		return -ENXIO;	switch (fmt_capture->bSubframeSize) {	case 3:		ua->format_bit = SNDRV_PCM_FMTBIT_S24_3LE;		break;	case 4:		ua->format_bit = SNDRV_PCM_FMTBIT_S32_LE;		break;	default:		dev_err(&ua->dev->dev, "sample width is not 24 or 32 bits/n");		return -ENXIO;	}	if (fmt_capture->bSubframeSize != fmt_playback->bSubframeSize) {		dev_err(&ua->dev->dev,			"playback/capture sample widths do not match/n");		return -ENXIO;	}	if (fmt_capture->bBitResolution != 24 ||	    fmt_playback->bBitResolution != 24) {		dev_err(&ua->dev->dev, "sample width is not 24 bits/n");		return -ENXIO;	}	ua->rate = combine_triple(fmt_capture->tSamFreq[0]);	rate2 = combine_triple(fmt_playback->tSamFreq[0]);	if (ua->rate != rate2) {		dev_err(&ua->dev->dev,			"playback/capture rates do not match: %u/%u/n",			rate2, ua->rate);		return -ENXIO;	}	switch (ua->dev->speed) {	case USB_SPEED_FULL:		ua->packets_per_second = 1000;		break;	case USB_SPEED_HIGH:		ua->packets_per_second = 8000;		break;	default:		dev_err(&ua->dev->dev, "unknown device speed/n");		return -ENXIO;	}	ua->capture.channels = fmt_capture->bNrChannels;	ua->playback.channels = fmt_playback->bNrChannels;	ua->capture.frame_bytes =		fmt_capture->bSubframeSize * ua->capture.channels;	ua->playback.frame_bytes =		fmt_playback->bSubframeSize * ua->playback.channels;	epd = &ua->intf[INTF_CAPTURE]->altsetting[1].endpoint[0].desc;	if (!usb_endpoint_is_isoc_in(epd)) {		dev_err(&ua->dev->dev, "invalid capture endpoint/n");		return -ENXIO;	}	ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, usb_endpoint_num(epd));	ua->capture.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);	epd = &ua->intf[INTF_PLAYBACK]->altsetting[1].endpoint[0].desc;	if (!usb_endpoint_is_isoc_out(epd)) {		dev_err(&ua->dev->dev, "invalid playback endpoint/n");		return -ENXIO;	}	ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, usb_endpoint_num(epd));	ua->playback.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);	return 0;}