+++ /dev/null
-/** @file libuvc_internal.h
- * @brief Implementation-specific UVC constants and structures.
- * @cond include_hidden
- */
-#ifndef LIBUVC_INTERNAL_H
-#define LIBUVC_INTERNAL_H
-
-#include <assert.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <pthread.h>
-#include <signal.h>
-#include "utlist.h"
-
-/** Converts an unaligned four-byte little-endian integer into an int32 */
-#define DW_TO_INT(p) ((p)[0] | ((p)[1] << 8) | ((p)[2] << 16) | ((p)[3] << 24))
-/** Converts an unaligned two-byte little-endian integer into an int16 */
-#define SW_TO_SHORT(p) ((p)[0] | ((p)[1] << 8))
-/** Converts an int16 into an unaligned two-byte little-endian integer */
-#define SHORT_TO_SW(s, p) \
- (p)[0] = (s); \
- (p)[1] = (s) >> 8;
-/** Converts an int32 into an unaligned four-byte little-endian integer */
-#define INT_TO_DW(i, p) \
- (p)[0] = (i); \
- (p)[1] = (i) >> 8; \
- (p)[2] = (i) >> 16; \
- (p)[3] = (i) >> 24;
-
-/** Selects the nth item in a doubly linked list. n=-1 selects the last item. */
-#define DL_NTH(head, out, n) \
- do { \
- int dl_nth_i = 0; \
- LDECLTYPE(head) dl_nth_p = (head); \
- if ((n) < 0) { \
- while (dl_nth_p && dl_nth_i > (n)) { \
- dl_nth_p = dl_nth_p->prev; \
- dl_nth_i--; \
- } \
- } else { \
- while (dl_nth_p && dl_nth_i < (n)) { \
- dl_nth_p = dl_nth_p->next; \
- dl_nth_i++; \
- } \
- } \
- (out) = dl_nth_p; \
- } while (0);
-
-#ifdef UVC_DEBUGGING
-#include <libgen.h>
-#define UVC_DEBUG(format, ...) fprintf(stderr, "[%s:%d/%s] " format "\n", basename(__FILE__), __LINE__, __FUNCTION__, ##__VA_ARGS__)
-#define UVC_ENTER() fprintf(stderr, "[%s:%d] begin %s\n", basename(__FILE__), __LINE__, __FUNCTION__)
-#define UVC_EXIT(code) fprintf(stderr, "[%s:%d] end %s (%d)\n", basename(__FILE__), __LINE__, __FUNCTION__, code)
-#define UVC_EXIT_VOID() fprintf(stderr, "[%s:%d] end %s\n", basename(__FILE__), __LINE__, __FUNCTION__)
-#else
-#define UVC_DEBUG(format, ...)
-#define UVC_ENTER()
-#define UVC_EXIT_VOID()
-#define UVC_EXIT(code)
-#endif
-
-/* http://stackoverflow.com/questions/19452971/array-size-macro-that-rejects-pointers */
-#define IS_INDEXABLE(arg) (sizeof(arg[0]))
-#define IS_ARRAY(arg) (IS_INDEXABLE(arg) && (((void *) &arg) == ((void *) arg)))
-#define ARRAYSIZE(arr) (sizeof(arr) / (IS_ARRAY(arr) ? sizeof(arr[0]) : 0))
-
-/** Video interface subclass code (A.2) */
-enum uvc_int_subclass_code {
- UVC_SC_UNDEFINED = 0x00,
- UVC_SC_VIDEOCONTROL = 0x01,
- UVC_SC_VIDEOSTREAMING = 0x02,
- UVC_SC_VIDEO_INTERFACE_COLLECTION = 0x03
-};
-
-/** Video interface protocol code (A.3) */
-enum uvc_int_proto_code {
- UVC_PC_PROTOCOL_UNDEFINED = 0x00
-};
-
-/** VideoControl interface descriptor subtype (A.5) */
-enum uvc_vc_desc_subtype {
- UVC_VC_DESCRIPTOR_UNDEFINED = 0x00,
- UVC_VC_HEADER = 0x01,
- UVC_VC_INPUT_TERMINAL = 0x02,
- UVC_VC_OUTPUT_TERMINAL = 0x03,
- UVC_VC_SELECTOR_UNIT = 0x04,
- UVC_VC_PROCESSING_UNIT = 0x05,
- UVC_VC_EXTENSION_UNIT = 0x06
-};
-
-/** VideoStreaming interface descriptor subtype (A.6) */
-enum uvc_vs_desc_subtype {
- UVC_VS_UNDEFINED = 0x00,
- UVC_VS_INPUT_HEADER = 0x01,
- UVC_VS_OUTPUT_HEADER = 0x02,
- UVC_VS_STILL_IMAGE_FRAME = 0x03,
- UVC_VS_FORMAT_UNCOMPRESSED = 0x04,
- UVC_VS_FRAME_UNCOMPRESSED = 0x05,
- UVC_VS_FORMAT_MJPEG = 0x06,
- UVC_VS_FRAME_MJPEG = 0x07,
- UVC_VS_FORMAT_MPEG2TS = 0x0a,
- UVC_VS_FORMAT_DV = 0x0c,
- UVC_VS_COLORFORMAT = 0x0d,
- UVC_VS_FORMAT_FRAME_BASED = 0x10,
- UVC_VS_FRAME_FRAME_BASED = 0x11,
- UVC_VS_FORMAT_STREAM_BASED = 0x12
-};
-
-/** UVC endpoint descriptor subtype (A.7) */
-enum uvc_ep_desc_subtype {
- UVC_EP_UNDEFINED = 0x00,
- UVC_EP_GENERAL = 0x01,
- UVC_EP_ENDPOINT = 0x02,
- UVC_EP_INTERRUPT = 0x03
-};
-
-/** VideoControl interface control selector (A.9.1) */
-enum uvc_vc_ctrl_selector {
- UVC_VC_CONTROL_UNDEFINED = 0x00,
- UVC_VC_VIDEO_POWER_MODE_CONTROL = 0x01,
- UVC_VC_REQUEST_ERROR_CODE_CONTROL = 0x02
-};
-
-/** Terminal control selector (A.9.2) */
-enum uvc_term_ctrl_selector {
- UVC_TE_CONTROL_UNDEFINED = 0x00
-};
-
-/** Selector unit control selector (A.9.3) */
-enum uvc_su_ctrl_selector {
- UVC_SU_CONTROL_UNDEFINED = 0x00,
- UVC_SU_INPUT_SELECT_CONTROL = 0x01
-};
-
-/** Extension unit control selector (A.9.6) */
-enum uvc_xu_ctrl_selector {
- UVC_XU_CONTROL_UNDEFINED = 0x00
-};
-
-/** VideoStreaming interface control selector (A.9.7) */
-enum uvc_vs_ctrl_selector {
- UVC_VS_CONTROL_UNDEFINED = 0x00,
- UVC_VS_PROBE_CONTROL = 0x01,
- UVC_VS_COMMIT_CONTROL = 0x02,
- UVC_VS_STILL_PROBE_CONTROL = 0x03,
- UVC_VS_STILL_COMMIT_CONTROL = 0x04,
- UVC_VS_STILL_IMAGE_TRIGGER_CONTROL = 0x05,
- UVC_VS_STREAM_ERROR_CODE_CONTROL = 0x06,
- UVC_VS_GENERATE_KEY_FRAME_CONTROL = 0x07,
- UVC_VS_UPDATE_FRAME_SEGMENT_CONTROL = 0x08,
- UVC_VS_SYNC_DELAY_CONTROL = 0x09
-};
-
-/** Status packet type (2.4.2.2) */
-enum uvc_status_type {
- UVC_STATUS_TYPE_CONTROL = 1,
- UVC_STATUS_TYPE_STREAMING = 2
-};
-
-/** Payload header flags (2.4.3.3) */
-#define UVC_STREAM_EOH (1 << 7)
-#define UVC_STREAM_ERR (1 << 6)
-#define UVC_STREAM_STI (1 << 5)
-#define UVC_STREAM_RES (1 << 4)
-#define UVC_STREAM_SCR (1 << 3)
-#define UVC_STREAM_PTS (1 << 2)
-#define UVC_STREAM_EOF (1 << 1)
-#define UVC_STREAM_FID (1 << 0)
-
-/** Control capabilities (4.1.2) */
-#define UVC_CONTROL_CAP_GET (1 << 0)
-#define UVC_CONTROL_CAP_SET (1 << 1)
-#define UVC_CONTROL_CAP_DISABLED (1 << 2)
-#define UVC_CONTROL_CAP_AUTOUPDATE (1 << 3)
-#define UVC_CONTROL_CAP_ASYNCHRONOUS (1 << 4)
-
-struct uvc_format_desc;
-struct uvc_frame_desc;
-struct uvc_streaming_interface;
-struct uvc_device_info;
-
-/** Frame descriptor
- *
- * A "frame" is a configuration of a streaming format
- * for a particular image size at one of possibly several
- * available frame rates.
- */
-typedef struct uvc_frame_desc {
- struct uvc_format_desc *parent;
- struct uvc_frame_desc *prev, *next;
- /** Type of frame, such as JPEG frame or uncompressed frme */
- enum uvc_vs_desc_subtype bDescriptorSubtype;
- /** Index of the frame within the list of specs available for this format */
- uint8_t bFrameIndex;
- uint8_t bmCapabilities;
- /** Image width */
- uint16_t wWidth;
- /** Image height */
- uint16_t wHeight;
- /** Bitrate of corresponding stream at minimal frame rate */
- uint32_t dwMinBitRate;
- /** Bitrate of corresponding stream at maximal frame rate */
- uint32_t dwMaxBitRate;
- /** Maximum number of bytes for a video frame */
- uint32_t dwMaxVideoFrameBufferSize;
- /** Default frame interval (in 100ns units) */
- uint32_t dwDefaultFrameInterval;
- /** Minimum frame interval for continuous mode (100ns units) */
- uint32_t dwMinFrameInterval;
- /** Maximum frame interval for continuous mode (100ns units) */
- uint32_t dwMaxFrameInterval;
- /** Granularity of frame interval range for continuous mode (100ns) */
- uint32_t dwFrameIntervalStep;
- /** Available frame rates, zero-terminated (in 100ns units) */
- uint32_t *intervals;
-} uvc_frame_desc_t;
-
-/** Format descriptor
- *
- * A "format" determines a stream's image type (e.g., raw YUYV or JPEG)
- * and includes many "frame" configurations.
- */
-typedef struct uvc_format_desc {
- struct uvc_streaming_interface *parent;
- struct uvc_format_desc *prev, *next;
- /** Type of image stream, such as JPEG or uncompressed. */
- enum uvc_vs_desc_subtype bDescriptorSubtype;
- /** Identifier of this format within the VS interface's format list */
- uint8_t bFormatIndex;
- /** Format specifier */
- union {
- uint8_t guidFormat[16];
- uint8_t fourccFormat[4];
- };
- /** Format-specific data */
- union {
- /** BPP for uncompressed stream */
- uint8_t bBitsPerPixel;
- /** Flags for JPEG stream */
- uint8_t bmFlags;
- };
- /** Default {uvc_frame_desc} to choose given this format */
- uint8_t bDefaultFrameIndex;
- uint8_t bAspectRatioX;
- uint8_t bAspectRatioY;
- uint8_t bmInterlaceFlags;
- uint8_t bCopyProtect;
- /** Available frame specifications for this format */
- struct uvc_frame_desc *frame_descs;
-} uvc_format_desc_t;
-
-
-/** VideoStream interface */
-typedef struct uvc_streaming_interface {
- struct uvc_device_info *parent;
- struct uvc_streaming_interface *prev, *next;
- /** Interface number */
- uint8_t bInterfaceNumber;
- /** Video formats that this interface provides */
- struct uvc_format_desc *format_descs;
- /** USB endpoint to use when communicating with this interface */
- uint8_t bEndpointAddress;
- uint8_t bTerminalLink;
-} uvc_streaming_interface_t;
-
-/** VideoControl interface */
-typedef struct uvc_control_interface {
- struct uvc_device_info *parent;
- struct uvc_input_terminal *input_term_descs;
- // struct uvc_output_terminal *output_term_descs;
- struct uvc_processing_unit *processing_unit_descs;
- struct uvc_extension_unit *extension_unit_descs;
- uint16_t bcdUVC;
- uint8_t bEndpointAddress;
- /** Interface number */
- uint8_t bInterfaceNumber;
-} uvc_control_interface_t;
-
-struct uvc_stream_ctrl;
-
-struct uvc_device {
- struct uvc_context *ctx;
- int ref;
- libusb_device *usb_dev;
-};
-
-typedef struct uvc_device_info {
- /** Configuration descriptor for USB device */
- struct libusb_config_descriptor *config;
- /** VideoControl interface provided by device */
- uvc_control_interface_t ctrl_if;
- /** VideoStreaming interfaces on the device */
- uvc_streaming_interface_t *stream_ifs;
-} uvc_device_info_t;
-
-struct uvc_stream_handle {
- struct uvc_device_handle *devh;
- struct uvc_stream_handle *prev, *next;
- struct uvc_streaming_interface *stream_if;
-
- /** if true, stream is running (streaming video to host) */
- uint8_t running;
- /** Current control block */
- struct uvc_stream_ctrl cur_ctrl;
-
- /* listeners may only access hold*, and only when holding a
- * lock on cb_mutex (probably signaled with cb_cond) */
- uint8_t fid;
- uint32_t seq, hold_seq;
- uint32_t pts, hold_pts;
- uint32_t last_scr, hold_last_scr;
- size_t got_bytes, hold_bytes;
- uint8_t *outbuf, *holdbuf;
- pthread_mutex_t cb_mutex;
- pthread_cond_t cb_cond;
- pthread_t cb_thread;
- uint32_t last_polled_seq;
- uvc_frame_callback_t *user_cb;
- void *user_ptr;
- struct libusb_transfer *transfers[5];
- uint8_t *transfer_bufs[5];
- struct uvc_frame frame;
- enum uvc_frame_format frame_format;
-};
-
-/** Handle on an open UVC device
- *
- * @todo move most of this into a uvc_device struct?
- */
-struct uvc_device_handle {
- struct uvc_device *dev;
- struct uvc_device_handle *prev, *next;
- /** Underlying USB device handle */
- libusb_device_handle *usb_devh;
- struct uvc_device_info *info;
- struct libusb_transfer *status_xfer;
- uint8_t status_buf[32];
- /** Function to call when we receive status updates from the camera */
- uvc_status_callback_t *status_cb;
- void *status_user_ptr;
-
- uvc_stream_handle_t *streams;
- /** Whether the camera is an iSight that sends one header per frame */
- uint8_t is_isight;
-};
-
-/** Context within which we communicate with devices */
-struct uvc_context {
- /** Underlying context for USB communication */
- struct libusb_context *usb_ctx;
- /** True iff libuvc initialized the underlying USB context */
- uint8_t own_usb_ctx;
- /** List of open devices in this context */
- uvc_device_handle_t *open_devices;
- pthread_t handler_thread;
- uint8_t kill_handler_thread;
-};
-
-uvc_error_t uvc_query_stream_ctrl(
- uvc_device_handle_t *devh,
- uvc_stream_ctrl_t *ctrl,
- uint8_t probe,
- enum uvc_req_code req);
-
-void uvc_start_handler_thread(uvc_context_t *ctx);
-uvc_error_t uvc_claim_if(uvc_device_handle_t *devh, int idx);
-uvc_error_t uvc_release_if(uvc_device_handle_t *devh, int idx);
-
-#endif // !def(LIBUVC_INTERNAL_H)
-/** @endcond */
-
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