3 * Copyright 2004 Google Inc.
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28 #include "talk/session/media/bundlefilter.h"
30 #include "talk/base/logging.h"
31 #include "talk/media/base/rtputils.h"
35 static const uint32 kSsrc01 = 0x01;
37 BundleFilter::BundleFilter() {
40 BundleFilter::~BundleFilter() {
43 bool BundleFilter::DemuxPacket(const char* data, size_t len, bool rtcp) {
44 // For rtp packets, we check whether the payload type can be found.
45 // For rtcp packets, we check whether the ssrc can be found or is the special
46 // value 1 except for SDES packets which always pass through. Plus, if
47 // |streams_| is empty, we will allow all rtcp packets pass through provided
48 // that they are valid rtcp packets in case that they are for early media.
51 if (!GetRtpPayloadType(data, len, &payload_type)) {
54 return FindPayloadType(payload_type);
57 // Rtcp packets using ssrc filter.
60 if (!GetRtcpType(data, len, &pl_type)) return false;
61 if (pl_type == kRtcpTypeSDES) {
62 // SDES packet parsing not supported.
63 LOG(LS_INFO) << "SDES packet received for demux.";
66 if (!GetRtcpSsrc(data, len, &ssrc)) return false;
67 if (ssrc == kSsrc01) {
68 // SSRC 1 has a special meaning and indicates generic feedback on
69 // some systems and should never be dropped. If it is forwarded
70 // incorrectly it will be ignored by lower layers anyway.
74 // Pass through if |streams_| is empty to allow early rtcp packets in.
75 return !HasStreams() || FindStream(ssrc);
78 void BundleFilter::AddPayloadType(int payload_type) {
79 payload_types_.insert(payload_type);
82 bool BundleFilter::AddStream(const StreamParams& stream) {
83 if (GetStreamBySsrc(streams_, stream.first_ssrc(), NULL)) {
84 LOG(LS_WARNING) << "Stream already added to filter";
87 streams_.push_back(stream);
91 bool BundleFilter::RemoveStream(uint32 ssrc) {
92 return RemoveStreamBySsrc(&streams_, ssrc);
95 bool BundleFilter::HasStreams() const {
96 return !streams_.empty();
99 bool BundleFilter::FindStream(uint32 ssrc) const {
103 return (GetStreamBySsrc(streams_, ssrc, NULL));
106 bool BundleFilter::FindPayloadType(int pl_type) const {
107 return payload_types_.find(pl_type) != payload_types_.end();
110 void BundleFilter::ClearAllPayloadTypes() {
111 payload_types_.clear();
114 } // namespace cricket