1 files changed, 139 insertions, 0 deletions
diff --git a/chromium/content/common/gpu/media/v4l2_video_device.cc b/chromium/content/common/gpu/media/v4l2_video_device.cc
new file mode 100644
index 00000000000..e9c54229c78
--- /dev/null
+++ b/chromium/content/common/gpu/media/v4l2_video_device.cc
@@ -0,0 +1,139 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <linux/videodev2.h>
+
+#include "base/numerics/safe_conversions.h"
+#include "content/common/gpu/media/exynos_v4l2_video_device.h"
+#include "content/common/gpu/media/tegra_v4l2_video_device.h"
+
+namespace content {
+
+V4L2Device::~V4L2Device() {}
+
+// static
+scoped_ptr<V4L2Device> V4L2Device::Create(Type type) {
+  DVLOG(3) << __PRETTY_FUNCTION__;
+
+  scoped_ptr<ExynosV4L2Device> exynos_device(new ExynosV4L2Device(type));
+  if (exynos_device->Initialize())
+    return exynos_device.PassAs<V4L2Device>();
+
+  scoped_ptr<TegraV4L2Device> tegra_device(new TegraV4L2Device(type));
+  if (tegra_device->Initialize())
+    return tegra_device.PassAs<V4L2Device>();
+
+  DLOG(ERROR) << "Failed to create V4L2Device";
+  return scoped_ptr<V4L2Device>();
+}
+
+// static
+media::VideoFrame::Format V4L2Device::V4L2PixFmtToVideoFrameFormat(
+    uint32 pix_fmt) {
+  switch (pix_fmt) {
+    case V4L2_PIX_FMT_NV12:
+    case V4L2_PIX_FMT_NV12M:
+      return media::VideoFrame::NV12;
+
+    case V4L2_PIX_FMT_YUV420:
+    case V4L2_PIX_FMT_YUV420M:
+      return media::VideoFrame::I420;
+
+    default:
+      LOG(FATAL) << "Add more cases as needed";
+      return media::VideoFrame::UNKNOWN;
+  }
+}
+
+// static
+uint32 V4L2Device::VideoFrameFormatToV4L2PixFmt(
+    media::VideoFrame::Format format) {
+  switch (format) {
+    case media::VideoFrame::NV12:
+      return V4L2_PIX_FMT_NV12M;
+
+    case media::VideoFrame::I420:
+      return V4L2_PIX_FMT_YUV420M;
+
+    default:
+      LOG(FATAL) << "Add more cases as needed";
+      return 0;
+  }
+}
+
+// static
+uint32 V4L2Device::VideoCodecProfileToV4L2PixFmt(
+    media::VideoCodecProfile profile) {
+  if (profile >= media::H264PROFILE_MIN &&
+      profile <= media::H264PROFILE_MAX) {
+    return V4L2_PIX_FMT_H264;
+  } else if (profile >= media::VP8PROFILE_MIN &&
+             profile <= media::VP8PROFILE_MAX) {
+    return V4L2_PIX_FMT_VP8;
+  } else {
+    LOG(FATAL) << "Add more cases as needed";
+    return 0;
+  }
+}
+
+// static
+gfx::Size V4L2Device::CodedSizeFromV4L2Format(struct v4l2_format format) {
+  gfx::Size coded_size;
+  gfx::Size visible_size;
+  media::VideoFrame::Format frame_format = media::VideoFrame::UNKNOWN;
+  int bytesperline = 0;
+  int sizeimage = 0;
+
+  if (V4L2_TYPE_IS_MULTIPLANAR(format.type) &&
+      format.fmt.pix_mp.num_planes > 0) {
+    bytesperline =
+        base::checked_cast<int>(format.fmt.pix_mp.plane_fmt[0].bytesperline);
+    sizeimage =
+        base::checked_cast<int>(format.fmt.pix_mp.plane_fmt[0].sizeimage);
+    visible_size.SetSize(base::checked_cast<int>(format.fmt.pix_mp.width),
+                         base::checked_cast<int>(format.fmt.pix_mp.height));
+    frame_format =
+        V4L2Device::V4L2PixFmtToVideoFrameFormat(format.fmt.pix_mp.pixelformat);
+  } else {
+    bytesperline = base::checked_cast<int>(format.fmt.pix.bytesperline);
+    sizeimage = base::checked_cast<int>(format.fmt.pix.sizeimage);
+    visible_size.SetSize(base::checked_cast<int>(format.fmt.pix.width),
+                         base::checked_cast<int>(format.fmt.pix.height));
+    frame_format =
+        V4L2Device::V4L2PixFmtToVideoFrameFormat(format.fmt.pix.pixelformat);
+  }
+
+  int horiz_bpp =
+      media::VideoFrame::PlaneHorizontalBitsPerPixel(frame_format, 0);
+  if (sizeimage == 0 || bytesperline == 0 || horiz_bpp == 0 ||
+      (bytesperline * 8) % horiz_bpp != 0) {
+    DLOG(ERROR) << "Invalid format provided";
+    return coded_size;
+  }
+
+  // Round up sizeimage to full bytesperlines. sizeimage does not have to be
+  // a multiple of bytesperline, as in V4L2 terms it's just a byte size of
+  // the buffer, unrelated to its payload.
+  sizeimage = ((sizeimage + bytesperline - 1) / bytesperline) * bytesperline;
+
+  coded_size.SetSize(bytesperline * 8 / horiz_bpp, sizeimage / bytesperline);
+
+  // Sanity checks. Calculated coded size has to contain given visible size
+  // and fulfill buffer byte size requirements for each plane.
+  DCHECK(gfx::Rect(coded_size).Contains(gfx::Rect(visible_size)));
+
+  if (V4L2_TYPE_IS_MULTIPLANAR(format.type)) {
+    for (size_t i = 0; i < format.fmt.pix_mp.num_planes; ++i) {
+      DCHECK_LE(
+          format.fmt.pix_mp.plane_fmt[i].sizeimage,
+          media::VideoFrame::PlaneAllocationSize(frame_format, i, coded_size));
+      DCHECK_LE(format.fmt.pix_mp.plane_fmt[i].bytesperline,
+                base::checked_cast<__u32>(coded_size.width()));
+    }
+  }
+
+  return coded_size;
+}
+
+}  //  namespace content