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| 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_multi_plane.h" | |
| 6 | |
| 7 #include <stddef.h> | |
| 8 #include <sys/mman.h> | |
| 9 | |
| 10 namespace media { | |
| 11 | |
| 12 V4L2CaptureDelegateMultiPlane::V4L2CaptureDelegateMultiPlane( | |
| 13 const VideoCaptureDevice::Name& device_name, | |
| 14 const scoped_refptr<base::SingleThreadTaskRunner>& v4l2_task_runner, | |
| 15 int power_line_frequency) | |
| 16 : V4L2CaptureDelegate(device_name, v4l2_task_runner, power_line_frequency) { | |
| 17 } | |
| 18 | |
| 19 V4L2CaptureDelegateMultiPlane::~V4L2CaptureDelegateMultiPlane() { | |
| 20 } | |
| 21 | |
| 22 scoped_refptr<V4L2CaptureDelegate::BufferTracker> | |
| 23 V4L2CaptureDelegateMultiPlane::CreateBufferTracker() const { | |
| 24 return make_scoped_refptr(new BufferTrackerMPlane()); | |
| 25 } | |
| 26 | |
| 27 bool V4L2CaptureDelegateMultiPlane::FillV4L2Format( | |
| 28 v4l2_format* format, | |
| 29 uint32_t width, | |
| 30 uint32_t height, | |
| 31 uint32_t pixelformat_fourcc) const { | |
| 32 format->fmt.pix_mp.width = width; | |
| 33 format->fmt.pix_mp.height = height; | |
| 34 format->fmt.pix_mp.pixelformat = pixelformat_fourcc; | |
| 35 | |
| 36 const size_t num_v4l2_planes = | |
| 37 V4L2CaptureDelegate::GetNumPlanesForFourCc(pixelformat_fourcc); | |
| 38 if (num_v4l2_planes == 0u) | |
| 39 return false; | |
| 40 DCHECK_LE(num_v4l2_planes, static_cast<size_t>(VIDEO_MAX_PLANES)); | |
| 41 format->fmt.pix_mp.num_planes = num_v4l2_planes; | |
| 42 | |
| 43 v4l2_planes_.resize(num_v4l2_planes); | |
| 44 return true; | |
| 45 } | |
| 46 | |
| 47 void V4L2CaptureDelegateMultiPlane::FinishFillingV4L2Buffer( | |
| 48 v4l2_buffer* buffer) const { | |
| 49 buffer->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE; | |
| 50 buffer->length = v4l2_planes_.size(); | |
| 51 | |
| 52 static const struct v4l2_plane empty_plane = {}; | |
| 53 std::fill(v4l2_planes_.begin(), v4l2_planes_.end(), empty_plane); | |
| 54 buffer->m.planes = v4l2_planes_.data(); | |
| 55 } | |
| 56 | |
| 57 void V4L2CaptureDelegateMultiPlane::SetPayloadSize( | |
| 58 const scoped_refptr<BufferTracker>& buffer_tracker, | |
| 59 const v4l2_buffer& buffer) const { | |
| 60 for (size_t i = 0; i < v4l2_planes_.size() && i < buffer.length; i++) | |
| 61 buffer_tracker->SetPlanePayloadSize(i, buffer.m.planes[i].bytesused); | |
| 62 } | |
| 63 | |
| 64 void V4L2CaptureDelegateMultiPlane::SendBuffer( | |
| 65 const scoped_refptr<BufferTracker>& buffer_tracker, | |
| 66 const v4l2_format& format) const { | |
| 67 DCHECK_EQ(capture_format().pixel_format, PIXEL_FORMAT_I420); | |
| 68 const size_t y_stride = format.fmt.pix_mp.plane_fmt[0].bytesperline; | |
| 69 const size_t u_stride = format.fmt.pix_mp.plane_fmt[1].bytesperline; | |
| 70 const size_t v_stride = format.fmt.pix_mp.plane_fmt[2].bytesperline; | |
| 71 DCHECK_GE(y_stride, 1u * capture_format().frame_size.width()); | |
| 72 DCHECK_GE(u_stride, 1u * capture_format().frame_size.width() / 2); | |
| 73 DCHECK_GE(v_stride, 1u * capture_format().frame_size.width() / 2); | |
| 74 client()->OnIncomingCapturedYuvData( | |
| 75 buffer_tracker->GetPlaneStart(0), buffer_tracker->GetPlaneStart(1), | |
| 76 buffer_tracker->GetPlaneStart(2), y_stride, u_stride, v_stride, | |
| 77 capture_format(), rotation(), base::TimeTicks::Now()); | |
| 78 } | |
| 79 | |
| 80 bool V4L2CaptureDelegateMultiPlane::BufferTrackerMPlane::Init( | |
| 81 int fd, | |
| 82 const v4l2_buffer& buffer) { | |
| 83 for (size_t p = 0; p < buffer.length; ++p) { | |
| 84 // Some devices require mmap() to be called with both READ and WRITE. | |
| 85 // See http://crbug.com/178582. | |
| 86 void* const start = | |
| 87 mmap(NULL, buffer.m.planes[p].length, PROT_READ | PROT_WRITE, | |
| 88 MAP_SHARED, fd, buffer.m.planes[p].m.mem_offset); | |
| 89 if (start == MAP_FAILED) { | |
| 90 DLOG(ERROR) << "Error mmap()ing a V4L2 buffer into userspace"; | |
| 91 return false; | |
| 92 } | |
| 93 AddMmapedPlane(static_cast<uint8_t*>(start), buffer.m.planes[p].length); | |
| 94 DVLOG(3) << "Mmap()ed plane #" << p << " of " << buffer.m.planes[p].length | |
| 95 << "B"; | |
| 96 } | |
| 97 return true; | |
| 98 } | |
| 99 | |
| 100 } // namespace media | |
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