Audio codec usage statistics

webrtc/modules/audio_coding/codecs/audio_encoder.h

 /*
  *  Copyright (c) 2014 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_CODECS_AUDIO_ENCODER_H_
 #define WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_ENCODER_H_
 
 #include <algorithm>
 #include <vector>
 
 #include "webrtc/base/array_view.h"
 #include "webrtc/base/buffer.h"
 #include "webrtc/base/deprecation.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
 // This is the interface class for encoders in AudioCoding module. Each codec
 // type must have an implementation of this class.
 class AudioEncoder {
  public:
+  // Used for UMA logging of codec usage. The same codecs, with the
+  // same values, must be listed in
+  // src/tools/metrics/histograms/histograms.xml in chromium to log
+  // correct values.
+  enum class CodecType {
+    kOther = 0,  // Codec not specified, and/or not listed in this enum
+    kOpus = 1,
+    kIsac = 2,
+    kPcmA = 3,
+    kPcmU = 4,
+    kG722 = 5,
+    kIlbc = 6,
+
+    // Number of histogram bins in the UMA logging of codec types. The
+    // total number of different codecs that are logged cannot exceed this
+    // number.
+    kMaxLoggedAudioCodecTypes
+  };
+
   struct EncodedInfoLeaf {
     size_t encoded_bytes = 0;
     uint32_t encoded_timestamp = 0;
     int payload_type = 0;
     bool send_even_if_empty = false;
     bool speech = true;
+    CodecType encoder_type = CodecType::kOther;
   };
 
   // This is the main struct for auxiliary encoding information. Each encoded
   // packet should be accompanied by one EncodedInfo struct, containing the
   // total number of |encoded_bytes|, the |encoded_timestamp| and the
   // |payload_type|. If the packet contains redundant encodings, the |redundant|
   // vector will be populated with EncodedInfoLeaf structs. Each struct in the
   // vector represents one encoding; the order of structs in the vector is the
   // same as the order in which the actual payloads are written to the byte
   // stream. When EncoderInfoLeaf structs are present in the vector, the main
@@ skipping 87 matching lines @@
 
  protected:
   // Subclasses implement this to perform the actual encoding. Called by
   // Encode().
   virtual EncodedInfo EncodeImpl(uint32_t rtp_timestamp,
                                  rtc::ArrayView<const int16_t> audio,
                                  rtc::Buffer* encoded) = 0;
 };
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_ENCODER_H_