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# Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS. All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.
"""Parses protobuf RTC dumps."""
from __future__ import division
import struct
import pyproto.logging.rtc_event_log.rtc_event_log_pb2 as rtc_pb
class DataPoint(object):
"""Simple container class for RTP events."""
def __init__(self, rtp_header_str, packet_size, arrival_timestamp_us,
incoming):
"""Builds a data point by parsing an RTP header, size and arrival time.
RTP header structure is defined in RFC 3550 section 5.1.
"""
self.size = packet_size
self.arrival_timestamp_ms = arrival_timestamp_us / 1000
self.incoming = incoming
header = struct.unpack_from("!HHII", rtp_header_str, 0)
(first2header_bytes, self.sequence_number, self.timestamp,
self.ssrc) = header
self.payload_type = first2header_bytes & 0b01111111
self.marker_bit = (first2header_bytes & 0b10000000) >> 7
def ParseProtobuf(file_path):
"""Parses RTC event log from protobuf file.
Args:
file_path: path to protobuf file of RTC event stream
Returns:
all RTP packet events from the event stream as a list of DataPoints
"""
event_stream = rtc_pb.EventStream()
with open(file_path, "rb") as f:
event_stream.ParseFromString(f.read())
return [
DataPoint(event.rtp_packet.header, event.rtp_packet.packet_length,
event.timestamp_us, event.rtp_packet.incoming)
for event in event_stream.stream if event.HasField("rtp_packet")
]
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