tor-browser

The Tor Browser
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timestamp_scaler.h (2187B)

      1 /*
      2 *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
      3 *
      4 *  Use of this source code is governed by a BSD-style license
      5 *  that can be found in the LICENSE file in the root of the source
      6 *  tree. An additional intellectual property rights grant can be found
      7 *  in the file PATENTS.  All contributing project authors may
      8 *  be found in the AUTHORS file in the root of the source tree.
      9 */
     10 
     11 #ifndef MODULES_AUDIO_CODING_NETEQ_TIMESTAMP_SCALER_H_
     12 #define MODULES_AUDIO_CODING_NETEQ_TIMESTAMP_SCALER_H_
     13 
     14 #include <cstdint>
     15 
     16 #include "modules/audio_coding/neteq/packet.h"
     17 
     18 namespace webrtc {
     19 
     20 // Forward declaration.
     21 class DecoderDatabase;
     22 
     23 // This class scales timestamps for codecs that need timestamp scaling.
     24 // This is done for codecs where one RTP timestamp does not correspond to
     25 // one sample.
     26 class TimestampScaler {
     27 public:
     28  explicit TimestampScaler(const DecoderDatabase& decoder_database)
     29      : first_packet_received_(false),
     30        numerator_(1),
     31        denominator_(1),
     32        external_ref_(0),
     33        internal_ref_(0),
     34        decoder_database_(decoder_database) {}
     35 
     36  virtual ~TimestampScaler() {}
     37 
     38  TimestampScaler(const TimestampScaler&) = delete;
     39  TimestampScaler& operator=(const TimestampScaler&) = delete;
     40 
     41  // Start over.
     42  virtual void Reset();
     43 
     44  // Scale the timestamp in `packet` from external to internal.
     45  virtual void ToInternal(Packet* packet);
     46 
     47  // Scale the timestamp for all packets in `packet_list` from external to
     48  // internal.
     49  virtual void ToInternal(PacketList* packet_list);
     50 
     51  // Returns the internal equivalent of `external_timestamp`, given the
     52  // RTP payload type `rtp_payload_type`.
     53  virtual uint32_t ToInternal(uint32_t external_timestamp,
     54                              uint8_t rtp_payload_type);
     55 
     56  // Scales back to external timestamp. This is the inverse of ToInternal().
     57  virtual uint32_t ToExternal(uint32_t internal_timestamp) const;
     58 
     59 private:
     60  bool first_packet_received_;
     61  int numerator_;
     62  int denominator_;
     63  uint32_t external_ref_;
     64  uint32_t internal_ref_;
     65  const DecoderDatabase& decoder_database_;
     66 };
     67 
     68 }  // namespace webrtc
     69 #endif  // MODULES_AUDIO_CODING_NETEQ_TIMESTAMP_SCALER_H_