1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "media/cast/net/rtp/packet_storage.h" 6 7 #include "base/logging.h" 8 #include "media/cast/cast_defines.h" 9 10 namespace media { 11 namespace cast { 12 13 PacketStorage::PacketStorage() 14 : first_frame_id_in_list_(0), 15 zombie_count_(0) { 16 } 17 18 PacketStorage::~PacketStorage() { 19 } 20 21 size_t PacketStorage::GetNumberOfStoredFrames() const { 22 return frames_.size() - zombie_count_; 23 } 24 25 void PacketStorage::StoreFrame(uint32 frame_id, 26 const SendPacketVector& packets) { 27 if (packets.empty()) { 28 NOTREACHED(); 29 return; 30 } 31 32 if (frames_.empty()) { 33 first_frame_id_in_list_ = frame_id; 34 } else { 35 // Make sure frame IDs are consecutive. 36 DCHECK_EQ(first_frame_id_in_list_ + static_cast<uint32>(frames_.size()), 37 frame_id); 38 // Make sure we aren't being asked to store more frames than the system's 39 // design limit. 40 DCHECK_LT(frames_.size(), static_cast<size_t>(kMaxUnackedFrames)); 41 } 42 43 // Save new frame to the end of the list. 44 frames_.push_back(packets); 45 } 46 47 void PacketStorage::ReleaseFrame(uint32 frame_id) { 48 const uint32 offset = frame_id - first_frame_id_in_list_; 49 if (static_cast<int32>(offset) < 0 || offset >= frames_.size() || 50 frames_[offset].empty()) { 51 return; 52 } 53 54 frames_[offset].clear(); 55 ++zombie_count_; 56 57 while (!frames_.empty() && frames_.front().empty()) { 58 DCHECK_GT(zombie_count_, 0u); 59 --zombie_count_; 60 frames_.pop_front(); 61 ++first_frame_id_in_list_; 62 } 63 } 64 65 const SendPacketVector* PacketStorage::GetFrame8(uint8 frame_id_8bits) const { 66 // The requested frame ID has only 8-bits so convert the first frame ID 67 // in list to match. 68 uint8 index_8bits = first_frame_id_in_list_ & 0xFF; 69 index_8bits = frame_id_8bits - index_8bits; 70 if (index_8bits >= frames_.size()) 71 return NULL; 72 const SendPacketVector& packets = frames_[index_8bits]; 73 return packets.empty() ? NULL : &packets; 74 } 75 76 } // namespace cast 77 } // namespace media 78
