#include <assert.h>
#include <errno.h>
#include <libusb.h>
+#include <unistd.h>
#include <netinet/in.h>
#include <sched.h>
#include <stdint.h>
using namespace std;
using namespace std::placeholders;
+#define USB_VENDOR_BLACKMAGIC 0x1edb
#define MIN_WIDTH 640
#define HEADER_SIZE 44
//#define HEADER_SIZE 0
#define FRAME_SIZE (8 << 20) // 8 MB.
#define USB_VIDEO_TRANSFER_SIZE (128 << 10) // 128 kB.
+card_connected_callback_t BMUSBCapture::card_connected_callback = nullptr;
+
namespace {
FILE *audiofp;
void BMUSBCapture::cb_xfr(struct libusb_transfer *xfr)
{
- if (xfr->status != LIBUSB_TRANSFER_COMPLETED) {
- fprintf(stderr, "transfer status %d\n", xfr->status);
+ if (xfr->status != LIBUSB_TRANSFER_COMPLETED &&
+ xfr->status != LIBUSB_TRANSFER_NO_DEVICE) {
+ fprintf(stderr, "error: transfer status %d\n", xfr->status);
libusb_free_transfer(xfr);
exit(3);
}
assert(xfr->user_data != nullptr);
BMUSBCapture *usb = static_cast<BMUSBCapture *>(xfr->user_data);
+ if (xfr->status == LIBUSB_TRANSFER_NO_DEVICE) {
+ if (!usb->disconnected) {
+ fprintf(stderr, "Device went away, stopping transfers.\n");
+ usb->disconnected = true;
+ if (usb->card_disconnected_callback) {
+ usb->card_disconnected_callback();
+ }
+ }
+ // Don't reschedule the transfer; the loop will stop by itself.
+ return;
+ }
+
if (xfr->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS) {
if (xfr->endpoint == 0x84) {
decode_packs(xfr, "DeckLinkAudioResyncT", 20, &usb->current_audio_frame, "audio", bind(&BMUSBCapture::start_new_audio_block, usb, _1));
}
}
+int BMUSBCapture::cb_hotplug(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data)
+{
+ if (card_connected_callback != nullptr) {
+ libusb_device_descriptor desc;
+ if (libusb_get_device_descriptor(dev, &desc) < 0) {
+ fprintf(stderr, "Error getting device descriptor for hotplugged device %p, killing hotplug\n", dev);
+ libusb_unref_device(dev);
+ return 1;
+ }
+
+ if ((desc.idVendor == USB_VENDOR_BLACKMAGIC && desc.idProduct == 0xbd3b) ||
+ (desc.idVendor == USB_VENDOR_BLACKMAGIC && desc.idProduct == 0xbd4f)) {
+ card_connected_callback(dev); // Callback takes ownership.
+ return 0;
+ }
+ }
+ libusb_unref_device(dev);
+ return 0;
+}
+
void BMUSBCapture::usb_thread_func()
{
sched_param param;
libusb_device *device;
};
+const char *get_product_name(uint16_t product)
+{
+ if (product == 0xbd3b) {
+ return "Intensity Shuttle";
+ } else if (product == 0xbd4f) {
+ return "UltraStudio SDI";
+ } else {
+ assert(false);
+ return nullptr;
+ }
+}
+
+string get_card_description(int id, uint8_t bus, uint8_t port, uint16_t product)
+{
+ const char *product_name = get_product_name(product);
+
+ char buf[256];
+ snprintf(buf, sizeof(buf), "USB card %d: Bus %03u Device %03u %s",
+ id, bus, port, product_name);
+ return buf;
+}
+
libusb_device_handle *open_card(int card_index, string *description)
-{
+{
libusb_device **devices;
ssize_t num_devices = libusb_get_device_list(nullptr, &devices);
if (num_devices == -1) {
uint8_t bus = libusb_get_bus_number(devices[i]);
uint8_t port = libusb_get_port_number(devices[i]);
- if (!(desc.idVendor == 0x1edb && desc.idProduct == 0xbd3b) &&
- !(desc.idVendor == 0x1edb && desc.idProduct == 0xbd4f)) {
+ if (!(desc.idVendor == USB_VENDOR_BLACKMAGIC && desc.idProduct == 0xbd3b) &&
+ !(desc.idVendor == USB_VENDOR_BLACKMAGIC && desc.idProduct == 0xbd4f)) {
libusb_unref_device(devices[i]);
continue;
}
});
for (size_t i = 0; i < found_cards.size(); ++i) {
- const char *product_name = nullptr;
- if (found_cards[i].product == 0xbd3b) {
- product_name = "Intensity Shuttle";
- } else if (found_cards[i].product == 0xbd4f) {
- product_name = "UltraStudio SDI";
- } else {
- assert(false);
- }
-
- char buf[256];
- snprintf(buf, sizeof(buf), "USB card %d: Bus %03u Device %03u %s",
- int(i), found_cards[i].bus, found_cards[i].port, product_name);
+ string tmp_description = get_card_description(i, found_cards[i].bus, found_cards[i].port, found_cards[i].product);
+ fprintf(stderr, "%s\n", tmp_description.c_str());
if (i == size_t(card_index)) {
- *description = buf;
+ *description = tmp_description;
}
- fprintf(stderr, "%s\n", buf);
}
if (size_t(card_index) >= found_cards.size()) {
return devh;
}
+libusb_device_handle *open_card(unsigned card_index, libusb_device *dev, string *description)
+{
+ uint8_t bus = libusb_get_bus_number(dev);
+ uint8_t port = libusb_get_port_number(dev);
+
+ libusb_device_descriptor desc;
+ if (libusb_get_device_descriptor(dev, &desc) < 0) {
+ fprintf(stderr, "Error getting device descriptor for device %p\n", dev);
+ exit(1);
+ }
+
+ *description = get_card_description(card_index, bus, port, desc.idProduct);
+
+ libusb_device_handle *devh;
+ int rc = libusb_open(dev, &devh);
+ if (rc < 0) {
+ fprintf(stderr, "Error opening card %p: %s\n", dev, libusb_error_name(rc));
+ exit(1);
+ }
+
+ return devh;
+}
+
void BMUSBCapture::configure_card()
{
if (video_frame_allocator == nullptr) {
exit(1);
}
- devh = open_card(card_index, &description);
+ if (dev == nullptr) {
+ devh = open_card(card_index, &description);
+ } else {
+ devh = open_card(card_index, dev, &description);
+ libusb_unref_device(dev);
+ }
if (!devh) {
fprintf(stderr, "Error finding USB device\n");
exit(1);
void BMUSBCapture::start_bm_thread()
{
+ // Devices leaving are discovered by seeing the isochronous packets
+ // coming back with errors, so only care about devices joining.
+ if (card_connected_callback != nullptr) {
+ if (libusb_hotplug_register_callback(
+ nullptr, LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED, LIBUSB_HOTPLUG_NO_FLAGS,
+ USB_VENDOR_BLACKMAGIC, LIBUSB_HOTPLUG_MATCH_ANY, LIBUSB_HOTPLUG_MATCH_ANY,
+ &BMUSBCapture::cb_hotplug, nullptr, nullptr) < 0) {
+ fprintf(stderr, "libusb_hotplug_register_callback() failed\n");
+ exit(1);
+ }
+ }
+
should_quit = false;
usb_thread = thread(&BMUSBCapture::usb_thread_func);
}
#ifndef _BMUSB_H
#define _BMUSB_H
+#include <libusb.h>
#include <stdint.h>
#include <atomic>
#include <condition_variable>
#include <thread>
#include <vector>
-struct libusb_device_handle;
-struct libusb_transfer;
+class BMUSBCapture;
// An interface for frame allocators; if you do not specify one
// (using set_video_frame_allocator), a default one that pre-allocates
FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)>
frame_callback_t;
+typedef std::function<void(libusb_device *dev)> card_connected_callback_t;
+typedef std::function<void()> card_disconnected_callback_t;
+
class CaptureInterface {
public:
virtual ~CaptureInterface() {}
virtual void start_bm_capture() = 0;
virtual void stop_dequeue_thread() = 0;
+
+ // If a card is disconnected, it cannot come back; you should call stop_dequeue_thread()
+ // and delete it.
+ virtual bool get_disconnected() const = 0;
};
// The actual capturing class, representing capture from a single card.
class BMUSBCapture : public CaptureInterface {
public:
- BMUSBCapture(int card_index)
- : card_index(card_index)
+ BMUSBCapture(int card_index, libusb_device *dev = nullptr)
+ : card_index(card_index), dev(dev)
{
}
void configure_card() override;
void start_bm_capture() override;
void stop_dequeue_thread() override;
+ bool get_disconnected() const override { return disconnected; }
// TODO: It's rather messy to have these outside the interface.
static void start_bm_thread();
static void stop_bm_thread();
+ // Hotplug event (for devices being inserted between start_bm_thread()
+ // and stop_bm_thread()); entirely optional, but must be set before
+ // start_bm_capture(). Note that your callback should do as little work
+ // as possible, since the callback comes from the main USB handling
+ // thread, which is very time-sensitive.
+ //
+ // The callback function transfers ownership. If you don't want to hold
+ // on to the device given to you in the callback, you need to call
+ // libusb_unref_device().
+ static void set_card_connected_callback(card_connected_callback_t callback)
+ {
+ card_connected_callback = callback;
+ }
+
+ // Similar to set_card_connected_callback(), with the same caveats.
+ // (Note that this is set per-card and not global, as it is logically
+ // connected to an existing BMUSBCapture object.)
+ void set_card_disconnected_callback(card_disconnected_callback_t callback)
+ {
+ card_disconnected_callback = callback;
+ }
+
private:
struct QueuedFrame {
uint16_t timecode;
static void usb_thread_func();
static void cb_xfr(struct libusb_transfer *xfr);
+ static int cb_hotplug(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data);
void update_capture_mode();
std::unique_ptr<FrameAllocator> owned_video_frame_allocator;
std::unique_ptr<FrameAllocator> owned_audio_frame_allocator;
frame_callback_t frame_callback = nullptr;
+ static card_connected_callback_t card_connected_callback;
+ card_disconnected_callback_t card_disconnected_callback = nullptr;
std::thread dequeue_thread;
std::atomic<bool> dequeue_thread_should_quit;
static constexpr int NUM_BMUSB_REGISTERS = 60;
uint8_t register_file[NUM_BMUSB_REGISTERS];
- int card_index;
+ // If <dev> is nullptr, will choose device number <card_index> from the list
+ // of available devices on the system. <dev> is not used after configure_card()
+ // (it will be unref-ed).
+ int card_index = -1;
+ libusb_device *dev = nullptr;
+
std::vector<libusb_transfer *> iso_xfrs;
int assumed_frame_width = 1280;
libusb_device_handle *devh = nullptr;
uint32_t current_video_input = 0x00000000; // HDMI/SDI.
uint32_t current_audio_input = 0x00000000; // Embedded.
+
+ bool disconnected = false;
};
// Get details for the given video format; returns false if detection was incomplete.
projects / bmusb / commitdiff