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91 lines
3.6 KiB
C++
91 lines
3.6 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ_PAYLOAD_SPLITTER_H_
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#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_PAYLOAD_SPLITTER_H_
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/modules/audio_coding/neteq/packet.h"
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namespace webrtc {
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// Forward declarations.
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class DecoderDatabase;
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// This class handles splitting of payloads into smaller parts.
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// The class does not have any member variables, and the methods could have
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// been made static. The reason for not making them static is testability.
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// With this design, the splitting functionality can be mocked during testing
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// of the NetEqImpl class.
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class PayloadSplitter {
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public:
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enum SplitterReturnCodes {
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kOK = 0,
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kNoSplit = 1,
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kTooLargePayload = -1,
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kFrameSplitError = -2,
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kUnknownPayloadType = -3,
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kRedLengthMismatch = -4,
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kFecSplitError = -5,
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};
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PayloadSplitter() {}
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virtual ~PayloadSplitter() {}
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// Splits each packet in |packet_list| into its separate RED payloads. Each
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// RED payload is packetized into a Packet. The original elements in
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// |packet_list| are properly deleted, and replaced by the new packets.
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// Note that all packets in |packet_list| must be RED payloads, i.e., have
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// RED headers according to RFC 2198 at the very beginning of the payload.
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// Returns kOK or an error.
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virtual int SplitRed(PacketList* packet_list);
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// Iterates through |packet_list| and, duplicate each audio payload that has
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// FEC as new packet for redundant decoding. The decoder database is needed to
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// get information about which payload type each packet contains.
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virtual int SplitFec(PacketList* packet_list,
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DecoderDatabase* decoder_database);
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// Checks all packets in |packet_list|. Packets that are DTMF events or
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// comfort noise payloads are kept. Except that, only one single payload type
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// is accepted. Any packet with another payload type is discarded.
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virtual int CheckRedPayloads(PacketList* packet_list,
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const DecoderDatabase& decoder_database);
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// Iterates through |packet_list| and, if possible, splits each audio payload
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// into suitable size chunks. The result is written back to |packet_list| as
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// new packets. The decoder database is needed to get information about which
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// payload type each packet contains.
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virtual int SplitAudio(PacketList* packet_list,
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const DecoderDatabase& decoder_database);
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private:
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// Splits the payload in |packet|. The payload is assumed to be from a
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// sample-based codec.
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virtual void SplitBySamples(const Packet* packet,
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int bytes_per_ms,
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int timestamps_per_ms,
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PacketList* new_packets);
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// Splits the payload in |packet|. The payload will be split into chunks of
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// size |bytes_per_frame|, corresponding to a |timestamps_per_frame|
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// RTP timestamps.
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virtual int SplitByFrames(const Packet* packet,
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int bytes_per_frame,
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int timestamps_per_frame,
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PacketList* new_packets);
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DISALLOW_COPY_AND_ASSIGN(PayloadSplitter);
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_PAYLOAD_SPLITTER_H_
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