video_capture_v4l2.h (2322B)
1 /* 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef MODULES_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_V4L2_H_ 12 #define MODULES_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_V4L2_H_ 13 14 #include <cstddef> 15 #include <cstdint> 16 17 #include "modules/video_capture/video_capture_defines.h" 18 #include "modules/video_capture/video_capture_impl.h" 19 #include "rtc_base/platform_thread.h" 20 #include "rtc_base/synchronization/mutex.h" 21 #include "rtc_base/thread_annotations.h" 22 #include "system_wrappers/include/clock.h" 23 24 namespace webrtc { 25 namespace videocapturemodule { 26 class VideoCaptureModuleV4L2 : public VideoCaptureImpl { 27 public: 28 explicit VideoCaptureModuleV4L2(Clock* clock); 29 ~VideoCaptureModuleV4L2() override; 30 int32_t Init(const char* deviceUniqueId); 31 int32_t StartCapture(const VideoCaptureCapability& capability) override; 32 int32_t StopCapture() override; 33 bool CaptureStarted() override; 34 int32_t CaptureSettings(VideoCaptureCapability& settings) override; 35 36 private: 37 enum { kNoOfV4L2Bufffers = 4 }; 38 39 static void CaptureThread(void*); 40 bool CaptureProcess(); 41 bool AllocateVideoBuffers() RTC_EXCLUSIVE_LOCKS_REQUIRED(capture_lock_); 42 bool DeAllocateVideoBuffers() RTC_EXCLUSIVE_LOCKS_REQUIRED(capture_lock_); 43 44 PlatformThread _captureThread RTC_GUARDED_BY(api_checker_); 45 Mutex capture_lock_ RTC_ACQUIRED_BEFORE(api_lock_); 46 bool quit_ RTC_GUARDED_BY(capture_lock_); 47 int32_t _deviceId RTC_GUARDED_BY(api_checker_); 48 int32_t _deviceFd RTC_GUARDED_BY(capture_checker_); 49 50 int32_t _buffersAllocatedByDevice RTC_GUARDED_BY(capture_lock_); 51 VideoCaptureCapability configured_capability_ 52 RTC_GUARDED_BY(capture_checker_); 53 bool _streaming RTC_GUARDED_BY(capture_checker_); 54 bool _captureStarted RTC_GUARDED_BY(api_checker_); 55 struct Buffer { 56 void* start; 57 size_t length; 58 }; 59 Buffer* _pool RTC_GUARDED_BY(capture_lock_); 60 }; 61 } // namespace videocapturemodule 62 } // namespace webrtc 63 64 #endif // MODULES_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_V4L2_H_