media/base/video_util.cc

// Copyright (c) 2011 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_util.h"

#include "base/logging.h"
#include "media/base/video_frame.h"

namespace media {

static void CopyPlane(size_t plane, const uint8* source, int stride, int rows,
                      VideoFrame* frame) {
  uint8* dest = frame->data(plane);
  int dest_stride = frame->stride(plane);

  // Clamp in case source frame has smaller stride.
  int bytes_to_copy_per_row = std::min(frame->row_bytes(plane), stride);

  // Clamp in case source frame has smaller height.
  int rows_to_copy = std::min(frame->rows(plane), rows);

  // Copy!
  for (int row = 0; row < rows_to_copy; ++row) {
    memcpy(dest, source, bytes_to_copy_per_row);
    source += stride;
    dest += dest_stride;
  }
}

void CopyYPlane(const uint8* source, int stride, int rows, VideoFrame* frame) {
  CopyPlane(VideoFrame::kYPlane, source, stride, rows, frame);
}

void CopyUPlane(const uint8* source, int stride, int rows, VideoFrame* frame) {
  CopyPlane(VideoFrame::kUPlane, source, stride, rows, frame);
}

void CopyVPlane(const uint8* source, int stride, int rows, VideoFrame* frame) {
  CopyPlane(VideoFrame::kVPlane, source, stride, rows, frame);
}

}  // namespace media