Delete unused video capture code for cropping, non-square pixels, and ARGB.

webrtc/media/base/videocommon.cc

 /*
  *  Copyright (c) 2010 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.
  */
 
@@ skipping 33 matching lines @@
 uint32_t CanonicalFourCC(uint32_t fourcc) {
   for (uint32_t i = 0; i < arraysize(kFourCCAliases); ++i) {
     if (kFourCCAliases[i].alias == fourcc) {
       return kFourCCAliases[i].canonical;
     }
   }
   // Not an alias, so return it as-is.
   return fourcc;
 }
 
-static float kScaleFactors[] = {
-  1.f / 1.f,  // Full size.
-  1.f / 2.f,  // 1/2 scale.
-  1.f / 4.f,  // 1/4 scale.
-  1.f / 8.f,  // 1/8 scale.
-  1.f / 16.f  // 1/16 scale.
-};
-
-static const int kNumScaleFactors = arraysize(kScaleFactors);
-
-// Finds the scale factor that, when applied to width and height, produces
-// fewer than num_pixels.
-static float FindLowerScale(int width, int height, int target_num_pixels) {
-  if (!target_num_pixels) {
-    return 0.f;
-  }
-  int best_distance = INT_MAX;
-  int best_index = kNumScaleFactors - 1;  // Default to max scale.
-  for (int i = 0; i < kNumScaleFactors; ++i) {
-    int test_num_pixels = static_cast<int>(width * kScaleFactors[i] *
-                                           height * kScaleFactors[i]);
-    int diff = target_num_pixels - test_num_pixels;
-    if (diff >= 0 && diff < best_distance) {
-      best_distance = diff;
-      best_index = i;
-      if (best_distance == 0) {  // Found exact match.
-        break;
-      }
-    }
-  }
-  return kScaleFactors[best_index];
-}
-
-// Computes a scale less to fit in max_pixels while maintaining aspect ratio.
-void ComputeScaleMaxPixels(int frame_width, int frame_height, int max_pixels,
-    int* scaled_width, int* scaled_height) {
-  ASSERT(scaled_width != NULL);
-  ASSERT(scaled_height != NULL);
-  ASSERT(max_pixels > 0);
-  const int kMaxWidth = 4096;
-  const int kMaxHeight = 3072;
-  int new_frame_width = frame_width;
-  int new_frame_height = frame_height;
-
-  // Limit width.
-  if (new_frame_width > kMaxWidth) {
-    new_frame_height = new_frame_height * kMaxWidth / new_frame_width;
-    new_frame_width = kMaxWidth;
-  }
-  // Limit height.
-  if (new_frame_height > kMaxHeight) {
-    new_frame_width = new_frame_width * kMaxHeight / new_frame_height;
-    new_frame_height = kMaxHeight;
-  }
-  // Limit number of pixels.
-  if (new_frame_width * new_frame_height > max_pixels) {
-    // Compute new width such that width * height is less than maximum but
-    // maintains original captured frame aspect ratio.
-    new_frame_width = static_cast<int>(sqrtf(static_cast<float>(
-        max_pixels) * new_frame_width / new_frame_height));
-    new_frame_height = max_pixels / new_frame_width;
-  }
-  // Snap to a scale factor that is less than or equal to target pixels.
-  float scale = FindLowerScale(frame_width, frame_height,
-                               new_frame_width * new_frame_height);
-  *scaled_width = static_cast<int>(frame_width * scale + .5f);
-  *scaled_height = static_cast<int>(frame_height * scale + .5f);
-}
-
-// Compute a size to scale frames to that is below maximum compression
-// and rendering size with the same aspect ratio.
-void ComputeScale(int frame_width, int frame_height, int fps,
-                  int* scaled_width, int* scaled_height) {
-  // Maximum pixels limit is set to Retina MacBookPro 15" resolution of
-  // 2880 x 1800 as of 4/18/2013.
-  // For high fps, maximum pixels limit is set based on common 24" monitor
-  // resolution of 2048 x 1280 as of 6/13/2013. The Retina resolution is
-  // therefore reduced to 1440 x 900.
-  int max_pixels = (fps > 5) ? 2048 * 1280 : 2880 * 1800;
-  ComputeScaleMaxPixels(
-      frame_width, frame_height, max_pixels, scaled_width, scaled_height);
-}
-
-// Compute size to crop video frame to.
-// If cropped_format_* is 0, return the frame_* size as is.
-void ComputeCrop(int cropped_format_width, int cropped_format_height,
-                 int frame_width, int frame_height,
-                 int pixel_width, int pixel_height,
-                 int rotation,
-                 int* cropped_width, int* cropped_height) {
-  // Transform screen crop to camera space if rotated.
-  if (rotation == 90 || rotation == 270) {
-    std::swap(cropped_format_width, cropped_format_height);
-  }
-  ASSERT(cropped_format_width >= 0);
-  ASSERT(cropped_format_height >= 0);
-  ASSERT(frame_width > 0);
-  ASSERT(frame_height > 0);
-  ASSERT(pixel_width >= 0);
-  ASSERT(pixel_height >= 0);
-  ASSERT(rotation == 0 || rotation == 90 || rotation == 180 || rotation == 270);
-  ASSERT(cropped_width != NULL);
-  ASSERT(cropped_height != NULL);
-  if (!pixel_width) {
-    pixel_width = 1;
-  }
-  if (!pixel_height) {
-    pixel_height = 1;
-  }
-  // if cropped_format is 0x0 disable cropping.
-  if (!cropped_format_height) {
-    cropped_format_height = 1;
-  }
-  float frame_aspect = static_cast<float>(frame_width * pixel_width) /
-      static_cast<float>(frame_height * pixel_height);
-  float crop_aspect = static_cast<float>(cropped_format_width) /
-      static_cast<float>(cropped_format_height);
-  // kAspectThresh is the maximum aspect ratio difference that we'll accept
-  // for cropping.  The value 1.34 allows cropping from 4:3 to 16:9.
-  // Set to zero to disable cropping entirely.
-  // TODO(fbarchard): crop to multiple of 16 width for better performance.
-  const float kAspectThresh = 1.34f;
-  // Wide aspect - crop horizontally
-  if (frame_aspect > crop_aspect &&
-      frame_aspect < crop_aspect * kAspectThresh) {
-    // Round width down to multiple of 4 to avoid odd chroma width.
-    // Width a multiple of 4 allows a half size image to have chroma channel
-    // that avoids rounding errors.
-    frame_width = static_cast<int>((crop_aspect * frame_height *
-        pixel_height) / pixel_width + 0.5f) & ~3;
-  } else if (frame_aspect < crop_aspect &&
-             frame_aspect > crop_aspect / kAspectThresh) {
-    frame_height = static_cast<int>((frame_width * pixel_width) /
-        (crop_aspect * pixel_height) + 0.5f) & ~1;
-  }
-  *cropped_width = frame_width;
-  *cropped_height = frame_height;
-}
-
-// Compute the frame size that makes pixels square pixel aspect ratio.
-void ComputeScaleToSquarePixels(int in_width, int in_height,
-                                int pixel_width, int pixel_height,
-                                int* scaled_width, int* scaled_height) {
-  *scaled_width = in_width;  // Keep width the same.
-  *scaled_height = in_height * pixel_height / pixel_width;
-}
-
 // The C++ standard requires a namespace-scope definition of static const
 // integral types even when they are initialized in the declaration (see
 // [class.static.data]/4), but MSVC with /Ze is non-conforming and treats that
 // as a multiply defined symbol error. See Also:
 // http://msdn.microsoft.com/en-us/library/34h23df8.aspx
 #ifndef _MSC_EXTENSIONS
 const int64_t VideoFormat::kMinimumInterval;  // Initialized in header.
 #endif
 
 std::string VideoFormat::ToString() const {
   std::string fourcc_name = GetFourccName(fourcc) + " ";
   for (std::string::const_iterator i = fourcc_name.begin();
       i < fourcc_name.end(); ++i) {
     // Test character is printable; Avoid isprint() which asserts on negatives.
     if (*i < 32 || *i >= 127) {
       fourcc_name = "";
       break;
     }
   }
 
   std::ostringstream ss;
   ss << fourcc_name << width << "x" << height << "x"
      << IntervalToFpsFloat(interval);
   return ss.str();
 }
 
 }  // namespace cricket