Added framer to cast.

media/cast/framer/framer.cc

+// Copyright 2013 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/cast/framer/framer.h"
+
+#include "base/logging.h"
+
+namespace media {
+namespace cast {
+
+typedef FrameList::const_iterator ConstFrameIterator;
+
+Framer::Framer(RtpPayloadFeedback* incoming_payload_feedback,
+               uint32 ssrc,
+               bool decoder_faster_than_max_frame_rate,
+               int max_unacked_frames)
+    : decoder_faster_than_max_frame_rate_(decoder_faster_than_max_frame_rate),
+      clock_(&default_tick_clock_),
+      cast_msg_builder_(new CastMessageBuilder(incoming_payload_feedback,
+          &frame_id_map_, ssrc, decoder_faster_than_max_frame_rate,
+          max_unacked_frames)) {
+  DCHECK(incoming_payload_feedback) << "Invalid argument";
+}
+
+Framer::~Framer() {}
+
+void Framer::InsertPacket(const uint8* payload_data,
+                          int payload_size,
+                          const RtpCastHeader& rtp_header) {
+  bool complete = false;
+  if (!frame_id_map_.InsertPacket(rtp_header, &complete)) return;
+
+  // Does this packet belong to a new frame?
+  FrameList::iterator it = frames_.find(rtp_header.frame_id);
+  if (it == frames_.end()) {
+    // New frame.
+    linked_ptr<FrameBuffer> frame_buffer(new FrameBuffer());
+    frame_buffer->InsertPacket(payload_data, payload_size, rtp_header);
+    frames_.insert(std::make_pair(rtp_header.frame_id, frame_buffer));
+  } else {
+    // Insert packet to existing frame buffer.
+    it->second->InsertPacket(payload_data, payload_size, rtp_header);
+  }
+
+  if (complete) {
+    // ACK as soon as possible.
+    cast_msg_builder_->CompleteFrameReceived(rtp_header.frame_id,
+                                             rtp_header.is_key_frame);
+  }
+}
+
+// This does not release the frame.
+bool Framer::GetEncodedAudioFrame(const base::TimeTicks& timeout,
+                                  EncodedAudioFrame* audio_frame,
+                                  uint32* rtp_timestamp,
+                                  bool* next_frame) {
+  uint8 frame_id;
+  // Find frame id.
+  if (frame_id_map_.NextContinuousFrame(&frame_id)) {
+    // We have our next frame.
+    *next_frame = true;
+  } else {
+    if (WaitForNextFrame(timeout)) return false;
+
+    if (!frame_id_map_.NextAudioFrameAllowingMissingFrames(&frame_id)) {
+      return false;
+    }
+    *next_frame = false;
+  }
+
+  ConstFrameIterator it = frames_.find(frame_id);
+  DCHECK(it != frames_.end());
+  if (it == frames_.end()) return false;
+
+  return it->second->GetEncodedAudioFrame(audio_frame, rtp_timestamp);
+}
+
+// This does not release the frame.
+bool Framer::GetEncodedVideoFrame(const base::TimeTicks& timeout,
+                                  EncodedVideoFrame* video_frame,
+                                  uint32* rtp_timestamp,
+                                  bool* next_frame) {
+  uint8 frame_id;
+  // Find frame id.
+  if (frame_id_map_.NextContinuousFrame(&frame_id)) {
+    // We have our next frame.
+    *next_frame = true;
+  } else {
+    if (WaitForNextFrame(timeout)) return false;
+
+    // Check if we can skip frames when our decoder is too slow.
+    if (!decoder_faster_than_max_frame_rate_) return false;
+
+    if (!frame_id_map_.NextVideoFrameAllowingSkippingFrames(&frame_id)) {
+      return false;
+    }
+    *next_frame = false;
+  }
+
+  ConstFrameIterator it = frames_.find(frame_id);
+  DCHECK(it != frames_.end());
+  if (it == frames_.end())  return false;
+
+  return it->second->GetEncodedVideoFrame(video_frame, rtp_timestamp);
+}
+
+bool Framer::WaitForNextFrame(const base::TimeTicks& timeout) const {
+  base::TimeDelta wait_time = timeout - clock_->NowTicks();
+  if (wait_time.InMilliseconds() > 0)
+    return true;
+
+  return false;
+}
+
+void Framer::Reset() {
+  frame_id_map_.Clear();
+  frames_.clear();
+  cast_msg_builder_->Reset();
+}
+
+void Framer::ReleaseFrame(uint8 frame_id) {
+  frame_id_map_.RemoveOldFrames(frame_id);
+  frames_.erase(frame_id);
+
+  // We have a frame - remove all frames with lower frame id.
+  FrameList::iterator it;
+  for (it = frames_.begin(); it != frames_.end(); ) {
+    if (IsOlderFrameId(it->first, frame_id)) {
+      frames_.erase(it++);
+    } else {
+      ++it;
+    }
+  }
+}
+
+bool Framer::TimeToSendNextCastMessage(base::TimeTicks* time_to_send) {
+  return cast_msg_builder_->TimeToSendNextCastMessage(time_to_send);
+}
+
+void Framer::SendCastMessage() {
+  cast_msg_builder_->UpdateCastMessage();
+}
+
+}  // namespace cast
+}  // namespace media