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 e78a4aacca75f538e663dcf00732a691ad9570f8..c2374beffa3919911732d627b2153b77816b078a 100644
--- a/webrtc/common_types.cc
+++ b/webrtc/common_types.cc
@@ -11,6 +11,7 @@
 #include "webrtc/base/checks.h"
 #include "webrtc/common_types.h"
 
+#include <limits>
 #include <string.h>
 
 namespace webrtc {
@@ -59,6 +60,7 @@ VideoCodec::VideoCodec()
       simulcastStream(),
       spatialLayers(),
       mode(kRealtimeVideo),
+      expect_encode_from_texture(false),
       codecSpecific() {}
 
 VideoCodecVP8* VideoCodec::VP8() {
@@ -91,4 +93,89 @@ const VideoCodecH264& VideoCodec::H264() const {
   return codecSpecific.H264;
 }
 
+static const char* kPayloadNameVp8 = "VP8";
+static const char* kPayloadNameVp9 = "VP9";
+static const char* kPayloadNameH264 = "H264";
+static const char* kPayloadNameI420 = "I420";
+static const char* kPayloadNameRED = "RED";
+static const char* kPayloadNameULPFEC = "ULPFEC";
+static const char* kPayloadNameGeneric = "Generic";
+
+rtc::Optional<std::string> CodecTypeToPayloadName(VideoCodecType type) {
+  switch (type) {
+    case kVideoCodecVP8:
+      return rtc::Optional<std::string>(kPayloadNameVp8);
+    case kVideoCodecVP9:
+      return rtc::Optional<std::string>(kPayloadNameVp9);
+    case kVideoCodecH264:
+      return rtc::Optional<std::string>(kPayloadNameH264);
+    case kVideoCodecI420:
+      return rtc::Optional<std::string>(kPayloadNameI420);
+    case kVideoCodecRED:
+      return rtc::Optional<std::string>(kPayloadNameRED);
+    case kVideoCodecULPFEC:
+      return rtc::Optional<std::string>(kPayloadNameULPFEC);
+    case kVideoCodecGeneric:
+      return rtc::Optional<std::string>(kPayloadNameGeneric);
+    default:
+      return rtc::Optional<std::string>();
+  }
+}
+
+rtc::Optional<VideoCodecType> PayloadNameToCodecType(const std::string& name) {
+  if (name == kPayloadNameVp8)
+    return rtc::Optional<VideoCodecType>(kVideoCodecVP8);
+  if (name == kPayloadNameVp9)
+    return rtc::Optional<VideoCodecType>(kVideoCodecVP9);
+  if (name == kPayloadNameH264)
+    return rtc::Optional<VideoCodecType>(kVideoCodecH264);
+  if (name == kPayloadNameI420)
+    return rtc::Optional<VideoCodecType>(kVideoCodecI420);
+  if (name == kPayloadNameRED)
+    return rtc::Optional<VideoCodecType>(kVideoCodecRED);
+  if (name == kPayloadNameULPFEC)
+    return rtc::Optional<VideoCodecType>(kVideoCodecULPFEC);
+  if (name == kPayloadNameGeneric)
+    return rtc::Optional<VideoCodecType>(kVideoCodecGeneric);
+  return rtc::Optional<VideoCodecType>();
+}
+
+const size_t BitrateAllocation::kMaxBitrateBps =
+    std::numeric_limits<size_t>::max();
+
+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));
+  RTC_DCHECK_LE(bitrates_[spatial_index][temporal_index], sum_);
+  size_t new_bitrate_sum_bps = sum_;
+  new_bitrate_sum_bps -= bitrates_[spatial_index][temporal_index];
+  new_bitrate_sum_bps += bitrate_bps;
+  if (new_bitrate_sum_bps > kMaxBitrateBps)

[stefan-webrtc, 2016/11/03 13:34:58]

Now the question is, can this ever happen when new_bitrate_sum_bps is a size_t?
:)

[sprang_webrtc, 2016/11/03 14:36:59]

Alright, let's do uint64_t instead then.

[stefan-webrtc, 2016/11/03 15:32:08]

Hehe... Or can we just assume it's safe? I just meant checking against max() was
useless.

+    return false;
+
+  bitrates_[spatial_index][temporal_index] = bitrate_bps;
+  sum_ = static_cast<uint32_t>(new_bitrate_sum_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