media/capture/video/linux/v4l2_capture_delegate_single_plane.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/capture/video/linux/v4l2_capture_delegate_single_plane.h"
   6
   7 #include <sys/mman.h>
   8
   9 namespace media {
  10
  11 scoped_refptr<V4L2CaptureDelegate::BufferTracker>
  12 V4L2CaptureDelegateSinglePlane::CreateBufferTracker() const {
  13   return make_scoped_refptr(new BufferTrackerSPlane());
  14 }
  15
  16 bool V4L2CaptureDelegateSinglePlane::FillV4L2Format(
  17     v4l2_format* format,
  18     uint32_t width,
  19     uint32_t height,
  20     uint32_t pixelformat_fourcc) const {
  21   format->fmt.pix.width = width;
  22   format->fmt.pix.height = height;
  23   format->fmt.pix.pixelformat = pixelformat_fourcc;
  24   return true;
  25 }
  26
  27 void V4L2CaptureDelegateSinglePlane::FinishFillingV4L2Buffer(
  28     v4l2_buffer* buffer) const {
  29   buffer->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  30 }
  31
  32 void V4L2CaptureDelegateSinglePlane::SetPayloadSize(
  33     const scoped_refptr<BufferTracker>& buffer_tracker,
  34     const v4l2_buffer& buffer) const {
  35   buffer_tracker->SetPlanePayloadSize(0, buffer.bytesused);
  36 }
  37
  38 void V4L2CaptureDelegateSinglePlane::SendBuffer(
  39     const scoped_refptr<BufferTracker>& buffer_tracker,
  40     const v4l2_format& format) const {
  41   client()->OnIncomingCapturedData(
  42       buffer_tracker->GetPlaneStart(0), buffer_tracker->GetPlanePayloadSize(0),
  43       capture_format(), rotation(), base::TimeTicks::Now());
  44 }
  45
  46 bool V4L2CaptureDelegateSinglePlane::BufferTrackerSPlane::Init(
  47     int fd,
  48     const v4l2_buffer& buffer) {
  49   // Some devices require mmap() to be called with both READ and WRITE.
  50   // See http://crbug.com/178582.
  51   void* const start = mmap(NULL, buffer.length, PROT_READ | PROT_WRITE,
  52                            MAP_SHARED, fd, buffer.m.offset);
  53   if (start == MAP_FAILED) {
  54     DLOG(ERROR) << "Error mmap()ing a V4L2 buffer into userspace";
  55     return false;
  56   }
  57   AddMmapedPlane(static_cast<uint8_t*>(start), buffer.length);
  58   return true;
  59 }
  60
  61 }  // namespace media