Extract bitrate allocation of spatial/temporal layers out of codec impl.

webrtc/common_types.cc

Index: webrtc/common_types.cc
diff --git a/webrtc/common_types.cc b/webrtc/common_types.cc
index 8f117e11530b027fd80aea33354804ec8676e326..d543552bfc59557c0fe3e520b72f0b1e0db2f7e2 100644
--- a/webrtc/common_types.cc
+++ b/webrtc/common_types.cc
@@ -10,6 +10,8 @@
 
 #include "webrtc/common_types.h"
 
+#include "webrtc/base/checks.h"
+
 #include <string.h>
 
 namespace webrtc {
@@ -42,4 +44,38 @@ RTPHeader::RTPHeader()
       payload_type_frequency(0),
       extension() {}
 
+BitrateAllocation::BitrateAllocation() : sum_(0), bitrates_{} {}
+
+bool BitrateAllocation::SetBitrate(size_t spatial_index,
+                                   size_t temporal_index,
+                                   uint32_t bitrate_bps) {
+  RTC_DCHECK_LT(spatial_index, static_cast<size_t>(kMaxSpatialLayers));
+  RTC_DCHECK_LT(temporal_index, static_cast<size_t>(kMaxTemporalStreams));
+  if (bitrate_bps > kMaxBitrateBps ||
+      sum_ - bitrates_[spatial_index][temporal_index] + bitrate_bps >
+          kMaxBitrateBps) {
+    return false;
+  }
+  sum_ -= bitrates_[spatial_index][temporal_index];
+  bitrates_[spatial_index][temporal_index] = bitrate_bps;
+  sum_ += bitrate_bps;
+  return true;
+}
+
+uint32_t BitrateAllocation::GetBitrate(size_t spatial_index,
+                                       size_t temporal_index) const {
+  RTC_DCHECK_LT(spatial_index, static_cast<size_t>(kMaxSpatialLayers));
+  RTC_DCHECK_LT(temporal_index, static_cast<size_t>(kMaxTemporalStreams));
+  return bitrates_[spatial_index][temporal_index];
+}
+
+// Get the sum of all the temporal layer for a specific spatial layer.
+uint32_t BitrateAllocation::GetSpatialLayerSum(size_t spatial_index) const {
+  RTC_DCHECK_LT(spatial_index, static_cast<size_t>(kMaxSpatialLayers));
+  uint32_t sum = 0;
+  for (int i = 0; i < kMaxTemporalStreams; ++i)
+    sum += bitrates_[spatial_index][i];
+  return sum;
+}
+
 }  // namespace webrtc