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-rw-r--r--media/base/video_frame_impl.cc140
1 files changed, 0 insertions, 140 deletions
diff --git a/media/base/video_frame_impl.cc b/media/base/video_frame_impl.cc
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index 8d9ae59..0000000
--- a/media/base/video_frame_impl.cc
+++ /dev/null
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-// Copyright (c) 2009 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 "media/base/video_frame_impl.h"
-
-namespace media {
-
-// static
-void VideoFrameImpl::CreateFrame(VideoSurface::Format format,
- size_t width,
- size_t height,
- base::TimeDelta timestamp,
- base::TimeDelta duration,
- scoped_refptr<VideoFrame>* frame_out) {
- DCHECK(width > 0 && height > 0);
- DCHECK(width * height < 100000000);
- DCHECK(frame_out);
- bool alloc_worked = false;
- scoped_refptr<VideoFrameImpl> frame =
- new VideoFrameImpl(format, width, height);
- if (frame) {
- frame->SetTimestamp(timestamp);
- frame->SetDuration(duration);
- switch (format) {
- case VideoSurface::RGB555:
- case VideoSurface::RGB565:
- alloc_worked = frame->AllocateRGB(2u);
- break;
- case VideoSurface::RGB24:
- alloc_worked = frame->AllocateRGB(3u);
- break;
- case VideoSurface::RGB32:
- case VideoSurface::RGBA:
- alloc_worked = frame->AllocateRGB(4u);
- break;
- case VideoSurface::YV12:
- case VideoSurface::YV16:
- alloc_worked = frame->AllocateYUV();
- break;
- default:
- NOTREACHED();
- alloc_worked = false;
- break;
- }
- }
- *frame_out = alloc_worked ? frame : NULL;
-}
-
-static inline size_t RoundUp(size_t value, size_t alignment) {
- // Check that |alignment| is a power of 2.
- DCHECK((alignment + (alignment - 1)) == (alignment | (alignment - 1)));
- return ((value + (alignment - 1)) & ~(alignment-1));
-}
-
-bool VideoFrameImpl::AllocateRGB(size_t bytes_per_pixel) {
- // Round up to align at a 64-bit (8 byte) boundary for each row. This
- // is sufficient for MMX reads (movq).
- size_t bytes_per_row = RoundUp(surface_.width * bytes_per_pixel, 8);
- surface_.planes = VideoSurface::kNumRGBPlanes;
- surface_.strides[VideoSurface::kRGBPlane] = bytes_per_row;
- surface_.data[VideoSurface::kRGBPlane] = new uint8[bytes_per_row *
- surface_.height];
- DCHECK(surface_.data[VideoSurface::kRGBPlane]);
- DCHECK(!(reinterpret_cast<int>(surface_.data[VideoSurface::kRGBPlane]) & 7));
- COMPILE_ASSERT(0 == VideoSurface::kRGBPlane, RGB_data_must_be_index_0);
- return (NULL != surface_.data[VideoSurface::kRGBPlane]);
-}
-
-bool VideoFrameImpl::AllocateYUV() {
- DCHECK(surface_.format == VideoSurface::YV12 ||
- surface_.format == VideoSurface::YV16);
- // Align Y rows at 32-bit (4 byte) boundaries. The stride for both YV12 and
- // YV16 is 1/2 of the stride of Y. For YV12, every row of bytes for U and V
- // applies to two rows of Y (one byte of UV for 4 bytes of Y), so in the
- // case of YV12 the strides are identical for the same width surface, but the
- // number of bytes allocated for YV12 is 1/2 the amount for U & V as YV16.
- // We also round the height of the surface allocated to be an even number
- // to avoid any potential of faulting by code that attempts to access the Y
- // values of the final row, but assumes that the last row of U & V applies to
- // a full two rows of Y.
- size_t alloc_height = RoundUp(surface_.height, 2);
- size_t y_bytes_per_row = RoundUp(surface_.width, 4);
- size_t uv_stride = RoundUp(y_bytes_per_row / 2, 4);
- size_t y_bytes = alloc_height * y_bytes_per_row;
- size_t uv_bytes = alloc_height * uv_stride;
- if (surface_.format == VideoSurface::YV12) {
- uv_bytes /= 2;
- }
- uint8* data = new uint8[y_bytes + (uv_bytes * 2)];
- if (data) {
- surface_.planes = VideoSurface::kNumYUVPlanes;
- COMPILE_ASSERT(0 == VideoSurface::kYPlane, y_plane_data_must_be_index_0);
- surface_.data[VideoSurface::kYPlane] = data;
- surface_.data[VideoSurface::kUPlane] = data + y_bytes;
- surface_.data[VideoSurface::kVPlane] = data + y_bytes + uv_bytes;
- surface_.strides[VideoSurface::kYPlane] = y_bytes_per_row;
- surface_.strides[VideoSurface::kUPlane] = uv_stride;
- surface_.strides[VideoSurface::kVPlane] = uv_stride;
- return true;
- }
- NOTREACHED();
- return false;
-}
-
-VideoFrameImpl::VideoFrameImpl(VideoSurface::Format format,
- size_t width,
- size_t height) {
- locked_ = false;
- memset(&surface_, 0, sizeof(surface_));
- surface_.format = format;
- surface_.width = width;
- surface_.height = height;
-}
-
-VideoFrameImpl::~VideoFrameImpl() {
- // In multi-plane allocations, only a single block of memory is allocated
- // on the heap, and other |data| pointers point inside the same, single block
- // so just delete index 0.
- delete[] surface_.data[0];
-}
-
-bool VideoFrameImpl::Lock(VideoSurface* surface) {
- DCHECK(!locked_);
- if (locked_) {
- memset(surface, 0, sizeof(*surface));
- return false;
- }
- locked_ = true;
- COMPILE_ASSERT(sizeof(*surface) == sizeof(surface_), surface_size_mismatch);
- memcpy(surface, &surface_, sizeof(*surface));
- return true;
-}
-
-void VideoFrameImpl::Unlock() {
- DCHECK(locked_);
- locked_ = false;
-}
-
-} // namespace media