Index: media/capture/video/file_video_capture_device.h |
diff --git a/media/capture/video/file_video_capture_device.h b/media/capture/video/file_video_capture_device.h |
index f50f04146d37094c6d3033412336858461961233..8672b50b8f672cd308439294d48b2606dd4a5f73 100644 |
--- a/media/capture/video/file_video_capture_device.h |
+++ b/media/capture/video/file_video_capture_device.h |
@@ -8,6 +8,7 @@ |
#include <string> |
#include "base/files/file.h" |
+#include "base/files/memory_mapped_file.h" |
#include "base/memory/scoped_ptr.h" |
#include "base/threading/thread.h" |
#include "base/threading/thread_checker.h" |
@@ -17,21 +18,31 @@ namespace media { |
// Implementation of a VideoCaptureDevice class that reads from a file. Used for |
// testing the video capture pipeline when no real hardware is available. The |
-// only supported file format is YUV4MPEG2 (a.k.a. Y4M), a minimal container |
-// with a series of uncompressed video only frames, see the link |
-// http://wiki.multimedia.cx/index.php?title=YUV4MPEG2 for more information |
-// on the file format. Several restrictions and notes apply, see the |
+// supported file formats are YUV4MPEG2 (a.k.a. Y4M) and MJPEG/JPEG. YUV4MPEG2 |
+// is a minimal container with a series of uncompressed video only frames, see |
+// the link http://wiki.multimedia.cx/index.php?title=YUV4MPEG2 for more |
+// information on the file format. Several restrictions and notes apply, see the |
// implementation file. |
-// Example videos can be found in http://media.xiph.org/video/derf. |
+// Example Y4M videos can be found in http://media.xiph.org/video/derf. |
class MEDIA_EXPORT FileVideoCaptureDevice : public VideoCaptureDevice { |
public: |
- static int64 ParseFileAndExtractVideoFormat( |
- base::File* file, |
- media::VideoCaptureFormat* video_format); |
- static base::File OpenFileForRead(const base::FilePath& file_path); |
+ // Reads and parses the header of a |mapped_file|, returning the collected |
+ // pixel format in |video_format| and storing current frame size in |
+ // |frame_size|. Returns the index of the first byte of the first video |
+ // frame. If parsing |mapped_file| failed, returns -1. |
+ // Restrictions: Only trivial Y4M per-frame headers and MJPEG are supported. |
+ static size_t ParseFileAndExtractVideoFormat( |
+ const base::MemoryMappedFile* mapped_file, |
+ media::VideoCaptureFormat* video_format, |
+ int* frame_size); |
+ |
+ // Opens a given file for reading, and returns the memory mapped file to the |
+ // caller, who is responsible for closing it. |
+ static scoped_ptr<base::MemoryMappedFile> |
+ OpenFileForRead(const base::FilePath& file_path); |
// Constructor of the class, with a fully qualified file path as input, which |
- // represents the Y4M video file to stream repeatedly. |
+ // represents the Y4M/MJPEG file to stream repeatedly. |
explicit FileVideoCaptureDevice(const base::FilePath& file_path); |
// VideoCaptureDevice implementation, class methods. |
@@ -41,14 +52,11 @@ class MEDIA_EXPORT FileVideoCaptureDevice : public VideoCaptureDevice { |
void StopAndDeAllocate() override; |
private: |
- // Returns size in bytes of an I420 frame, not including possible paddings, |
- // defined by |capture_format_|. |
- int CalculateFrameSize() const; |
- |
// Called on the |capture_thread_|. |
void OnAllocateAndStart(const VideoCaptureParams& params, |
scoped_ptr<Client> client); |
void OnStopAndDeAllocate(); |
+ const uint8_t* GetNextFrame(); |
void OnCaptureTask(); |
// |thread_checker_| is used to check that destructor, AllocateAndStart() and |
@@ -61,12 +69,11 @@ class MEDIA_EXPORT FileVideoCaptureDevice : public VideoCaptureDevice { |
// The following members belong to |capture_thread_|. |
scoped_ptr<VideoCaptureDevice::Client> client_; |
const base::FilePath file_path_; |
- base::File file_; |
- scoped_ptr<uint8[]> video_frame_; |
+ scoped_ptr<base::MemoryMappedFile> mapped_file_; |
VideoCaptureFormat capture_format_; |
int frame_size_; |
- int64 current_byte_index_; |
- int64 first_frame_byte_index_; |
+ size_t current_byte_index_; |
+ size_t first_frame_byte_index_; |
// Target time for the next frame. |
base::TimeTicks next_frame_time_; |