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-/*
- * Copyright (c) 2012 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.
- */
-
-#ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ4_PAYLOAD_SPLITTER_H_
-#define WEBRTC_MODULES_AUDIO_CODING_NETEQ4_PAYLOAD_SPLITTER_H_
-
-#include "webrtc/modules/audio_coding/neteq4/packet.h"
-#include "webrtc/system_wrappers/interface/constructor_magic.h"
-
-namespace webrtc {
-
-// Forward declarations.
-class DecoderDatabase;
-
-// This class handles splitting of payloads into smaller parts.
-// The class does not have any member variables, and the methods could have
-// been made static. The reason for not making them static is testability.
-// With this design, the splitting functionality can be mocked during testing
-// of the NetEqImpl class.
-class PayloadSplitter {
- public:
- enum SplitterReturnCodes {
- kOK = 0,
- kNoSplit = 1,
- kTooLargePayload = -1,
- kFrameSplitError = -2,
- kUnknownPayloadType = -3,
- kRedLengthMismatch = -4
- };
-
- PayloadSplitter() {}
-
- virtual ~PayloadSplitter() {}
-
- // Splits each packet in |packet_list| into its separate RED payloads. Each
- // RED payload is packetized into a Packet. The original elements in
- // |packet_list| are properly deleted, and replaced by the new packets.
- // Note that all packets in |packet_list| must be RED payloads, i.e., have
- // RED headers according to RFC 2198 at the very beginning of the payload.
- // Returns kOK or an error.
- virtual int SplitRed(PacketList* packet_list);
-
- // Checks all packets in |packet_list|. Packets that are DTMF events or
- // comfort noise payloads are kept. Except that, only one single payload type
- // is accepted. Any packet with another payload type is discarded.
- virtual int CheckRedPayloads(PacketList* packet_list,
- const DecoderDatabase& decoder_database);
-
- // Iterates through |packet_list| and, if possible, splits each audio payload
- // into suitable size chunks. The result is written back to |packet_list| as
- // new packets. The decoder database is needed to get information about which
- // payload type each packet contains.
- virtual int SplitAudio(PacketList* packet_list,
- const DecoderDatabase& decoder_database);
-
- private:
- // Splits the payload in |packet|. The payload is assumed to be from a
- // sample-based codec.
- virtual void SplitBySamples(const Packet* packet,
- int bytes_per_ms,
- int timestamps_per_ms,
- PacketList* new_packets);
-
- // Splits the payload in |packet|. The payload will be split into chunks of
- // size |bytes_per_frame|, corresponding to a |timestamps_per_frame|
- // RTP timestamps.
- virtual int SplitByFrames(const Packet* packet,
- int bytes_per_frame,
- int timestamps_per_frame,
- PacketList* new_packets);
-
- DISALLOW_COPY_AND_ASSIGN(PayloadSplitter);
-};
-
-} // namespace webrtc
-#endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ4_PAYLOAD_SPLITTER_H_