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// Copyright (c) 2012 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 <cmath>
#include "base/logging.h"
#include "media/base/video_frame.h"
namespace media {
gfx::Size GetNaturalSize(const gfx::Size& visible_size,
int aspect_ratio_numerator,
int aspect_ratio_denominator) {
if (aspect_ratio_denominator == 0 ||
aspect_ratio_numerator < 0 ||
aspect_ratio_denominator < 0)
return gfx::Size();
double aspect_ratio = aspect_ratio_numerator /
static_cast<double>(aspect_ratio_denominator);
int width = floor(visible_size.width() * aspect_ratio + 0.5);
int height = visible_size.height();
// An even width makes things easier for YV12 and appears to be the behavior
// expected by WebKit layout tests.
return gfx::Size(width & ~1, height);
}
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);
}
void FillYUV(VideoFrame* frame, uint8 y, uint8 u, uint8 v) {
// Fill the Y plane.
uint8* y_plane = frame->data(VideoFrame::kYPlane);
int y_rows = frame->rows(VideoFrame::kYPlane);
int y_row_bytes = frame->row_bytes(VideoFrame::kYPlane);
for (int i = 0; i < y_rows; ++i) {
memset(y_plane, y, y_row_bytes);
y_plane += frame->stride(VideoFrame::kYPlane);
}
// Fill the U and V planes.
uint8* u_plane = frame->data(VideoFrame::kUPlane);
uint8* v_plane = frame->data(VideoFrame::kVPlane);
int uv_rows = frame->rows(VideoFrame::kUPlane);
int u_row_bytes = frame->row_bytes(VideoFrame::kUPlane);
int v_row_bytes = frame->row_bytes(VideoFrame::kVPlane);
for (int i = 0; i < uv_rows; ++i) {
memset(u_plane, u, u_row_bytes);
memset(v_plane, v, v_row_bytes);
u_plane += frame->stride(VideoFrame::kUPlane);
v_plane += frame->stride(VideoFrame::kVPlane);
}
}
} // namespace media
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