Returning correct duration estimate on Opus DTX packets.

webrtc/modules/audio_coding/codecs/opus/interface/opus_interface.h

 /*
  *  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.
  */
 
@@ skipping 276 matching lines @@
  *        - payload              : Encoded data pointer
  *        - payload_length_bytes : Bytes of encoded data
  *
  * Return value                  : The duration of the packet, in samples per
  *                                 channel.
  */
 int WebRtcOpus_DurationEst(OpusDecInst* inst,
                            const uint8_t* payload,
                            size_t payload_length_bytes);
 
+/****************************************************************************
+ * WebRtcOpus_PlcDuration(...)
+ *
+ * This function calculates the duration of a frame returned by packet loss
+ * concealment (PLC).
+ *
+ * Input:
+ *        - inst                 : Decoder context
+ *
+ * Return value                  : The duration of a frame returned by PLC, in
+ *                                 samples per channel.
+ */
+int WebRtcOpus_PlcDuration(OpusDecInst* inst);
+
 /* TODO(minyue): Check whether it is needed to add a decoder context to the
  * arguments, like WebRtcOpus_DurationEst(...). In fact, the packet itself tells
  * the duration. The decoder context in WebRtcOpus_DurationEst(...) is not used.
  * So it may be advisable to remove it from WebRtcOpus_DurationEst(...). */
 
 /****************************************************************************
  * WebRtcOpus_FecDurationEst(...)
  *
  * This function calculates the duration of the FEC data within an opus packet.
  * Input:
@@ skipping 19 matching lines @@
  *                                 1 - the packet contains FEC.
  */
 int WebRtcOpus_PacketHasFec(const uint8_t* payload,
                             size_t payload_length_bytes);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_OPUS_INTERFACE_OPUS_INTERFACE_H_