modules/video_processing/main/source/color_enhancement.cc

/*
 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include <stdlib.h>  // NULL

#include "webrtc/modules/video_processing/main/source/color_enhancement.h"
#include "webrtc/modules/video_processing/main/source/color_enhancement_private.h"
#include "webrtc/system_wrappers/interface/trace.h"

namespace webrtc {
namespace VideoProcessing {

int32_t ColorEnhancement(I420VideoFrame* frame) {
assert(frame);
// Pointers to U and V color pixels.
uint8_t* ptr_u;
uint8_t* ptr_v;
uint8_t temp_chroma;
if (frame->IsZeroSize()) {
  WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing,
               -1, "Null frame pointer");
  return VPM_GENERAL_ERROR;
}

if (frame->width() == 0 || frame->height() == 0) {
  WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing,
               -1, "Invalid frame size");
  return VPM_GENERAL_ERROR;
}

// Set pointers to first U and V pixels (skip luminance).
ptr_u = frame->buffer(kUPlane);
ptr_v = frame->buffer(kVPlane);
int size_uv = ((frame->width() + 1) / 2) * ((frame->height() + 1) / 2);

// Loop through all chrominance pixels and modify color.
for (int ix = 0; ix < size_uv; ix++) {
  temp_chroma = colorTable[*ptr_u][*ptr_v];
  *ptr_v = colorTable[*ptr_v][*ptr_u];
  *ptr_u = temp_chroma;

  ptr_u++;
  ptr_v++;
}
return VPM_OK;
}

}  // namespace VideoProcessing
}  // namespace webrtc