+++ /dev/null
-/*********************************************************************
- * modified _uvc_handle_events to improve performance on Android
- * Copyright (C) 2014 saki@serenegiant All rights reserved.
- *********************************************************************/
-/*********************************************************************
- * Software License Agreement (BSD License)
- *
- * Copyright (C) 2010-2012 Ken Tossell
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- * * Neither the name of the author nor other contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *********************************************************************/
-/**
-\mainpage libuvc: a cross-platform library for USB video devices
-
-\b libuvc is a library that supports enumeration, control and streaming
-for USB Video Class (UVC) devices, such as consumer webcams.
-
-\section features Features
-\li UVC device \ref device "discovery and management" API
-\li \ref streaming "Video streaming" (device to host) with asynchronous/callback and synchronous/polling modes
-\li Read/write access to standard \ref ctrl "device settings"
-\li \ref frame "Conversion" between various formats: RGB, YUV, JPEG, etc.
-\li Tested on Mac and Linux, portable to Windows and some BSDs
-
-\section roadmap Roadmap
-\li Bulk-mode image capture
-\li One-shot image capture
-\li Improved support for standard settings
-\li Support for "extended" (vendor-defined) settings
-
-\section misc Misc.
-\p The source code can be found at https://github.com/ktossell/libuvc. To build
-the library, install <a href="http://libusb.org/">libusb</a> 1.0+ and run:
-
-\code
-$ git clone https://github.com/ktossell/libuvc.git
-$ cd libuvc
-$ mkdir build
-$ cd build
-$ cmake -DCMAKE_BUILD_TYPE=Release ..
-$ make && make install
-\endcode
-
-\section Example
-In this example, libuvc is used to acquire images in a 30 fps, 640x480
-YUV stream from a UVC device such as a standard webcam.
-
-\include example.c
-
-*/
-
-/**
- * @defgroup init Library initialization/deinitialization
- * @brief Setup routines used to construct UVC access contexts
- */
-#include "libuvc/libuvc.h"
-#include "libuvc/libuvc_internal.h"
-#if defined(__ANDROID__)
-#include <unistd.h>
-#include <sys/time.h>
-#include <sys/resource.h>
-#endif // defined(__ANDROID__)
-
-/** @internal
- * @brief Event handler thread
- * There's one of these per UVC context.
- * @todo We shouldn't run this if we don't own the USB context
- */
-void *_uvc_handle_events(void *arg) {
- uvc_context_t *ctx = (uvc_context_t *) arg;
-
-#if defined(__ANDROID__)
- // try to increase thread priority
- int prio = getpriority(PRIO_PROCESS, 0);
- nice(-18);
- if (UNLIKELY(getpriority(PRIO_PROCESS, 0) >= prio)) {
- LOGW("could not change thread priority");
- }
-#endif
- for (; !ctx->kill_handler_thread ;)
- libusb_handle_events(ctx->usb_ctx);
- return NULL;
-}
-
-/** @brief Initializes the UVC context
- * @ingroup init
- *
- * @note If you provide your own USB context, you must handle
- * libusb event processing using a function such as libusb_handle_events.
- *
- * @param[out] pctx The location where the context reference should be stored.
- * @param[in] usb_ctx Optional USB context to use
- * @return Error opening context or UVC_SUCCESS
- */
-uvc_error_t uvc_init2(uvc_context_t **pctx, struct libusb_context *usb_ctx, const char *usbfs) {
- uvc_error_t ret = UVC_SUCCESS;
- uvc_context_t *ctx = calloc(1, sizeof(*ctx));
-
- if (usb_ctx == NULL) {
- if (usbfs && strlen(usbfs) > 0) {
- LOGD("call #libusb_init2");
- ret = libusb_init2(&ctx->usb_ctx, usbfs);
- } else {
- LOGD("call #libusb_init");
- ret = libusb_init(&ctx->usb_ctx);
- }
- ctx->own_usb_ctx = 1;
- if (UNLIKELY(ret != UVC_SUCCESS)) {
- LOGW("failed:err=%d", ret);
- free(ctx);
- ctx = NULL;
- }
- } else {
- ctx->own_usb_ctx = 0;
- ctx->usb_ctx = usb_ctx;
- }
-
- if (ctx != NULL)
- *pctx = ctx;
-
- return ret;
-}
-
-uvc_error_t uvc_init(uvc_context_t **pctx, struct libusb_context *usb_ctx) {
- return uvc_init2(pctx, usb_ctx, NULL);
-#if 0
- uvc_error_t ret = UVC_SUCCESS;
- uvc_context_t *ctx = calloc(1, sizeof(*ctx));
-
- if (usb_ctx == NULL) {
- ret = libusb_init(&ctx->usb_ctx);
- ctx->own_usb_ctx = 1;
- if (UNLIKELY(ret != UVC_SUCCESS)) {
- free(ctx);
- ctx = NULL;
- }
- } else {
- ctx->own_usb_ctx = 0;
- ctx->usb_ctx = usb_ctx;
- }
-
- if (ctx != NULL)
- *pctx = ctx;
-
- return ret;
-#endif
-}
-
-/**
- * @brief Closes the UVC context, shutting down any active cameras.
- * @ingroup init
- *
- * @note This function invalides any existing references to the context's
- * cameras.
- *
- * If no USB context was provided to #uvc_init, the UVC-specific USB
- * context will be destroyed.
- *
- * @param ctx UVC context to shut down
- */
-void uvc_exit(uvc_context_t *ctx) {
- uvc_device_handle_t *devh;
-
- DL_FOREACH(ctx->open_devices, devh)
- {
- uvc_close(devh);
- }
-
- if (ctx->own_usb_ctx)
- libusb_exit(ctx->usb_ctx);
-
- free(ctx);
-}
-
-/**
- * @internal
- * @brief Spawns a handler thread for the context
- * @ingroup init
- *
- * This should be called at the end of a successful uvc_open if no devices
- * are already open (and being handled).
- */
-void uvc_start_handler_thread(uvc_context_t *ctx) {
- if (ctx->own_usb_ctx) {
- pthread_create(&ctx->handler_thread, NULL, _uvc_handle_events, (void*) ctx);
- }
-}
-
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