Add UMA tracing for unsupported codecs

media/filters/ffmpeg_demuxer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/filters/ffmpeg_demuxer.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
+#include "base/metrics/sparse_histogram.h"
 #include "base/stl_util.h"
 #include "base/string_util.h"
 #include "base/task_runner_util.h"
 #include "base/time.h"
 #include "media/base/audio_decoder_config.h"
 #include "media/base/bind_to_loop.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/decrypt_config.h"
 #include "media/base/limits.h"
 #include "media/base/media_switches.h"
@@ skipping 431 matching lines @@
   bool found_video_stream = false;
 
   base::TimeDelta max_duration;
   for (size_t i = 0; i < format_context->nb_streams; ++i) {
     AVCodecContext* codec_context = format_context->streams[i]->codec;
     AVMediaType codec_type = codec_context->codec_type;
 
     if (codec_type == AVMEDIA_TYPE_AUDIO) {
       if (found_audio_stream)
         continue;
+      // Log the codec detected, whether it is supported or not.
+      UMA_HISTOGRAM_SPARSE_SLOWLY("Media.DetectedAudioCodec",
+                                  codec_context->codec_id);
       // Ensure the codec is supported.
       if (CodecIDToAudioCodec(codec_context->codec_id) == kUnknownAudioCodec)
         continue;
       found_audio_stream = true;
     } else if (codec_type == AVMEDIA_TYPE_VIDEO) {
       if (found_video_stream)
         continue;
+      // Log the codec detected, whether it is supported or not.
+      UMA_HISTOGRAM_SPARSE_SLOWLY("Media.DetectedVideoCodec",
+                                  codec_context->codec_id);
       // Ensure the codec is supported.
       if (CodecIDToVideoCodec(codec_context->codec_id) == kUnknownVideoCodec)
         continue;
       found_video_stream = true;
     } else {
       continue;
     }
 
     AVStream* stream = format_context->streams[i];
     scoped_refptr<FFmpegDemuxerStream> demuxer_stream(
@@ skipping 245 matching lines @@
   }
   for (size_t i = 0; i < buffered.size(); ++i)
     host_->AddBufferedTimeRange(buffered.start(i), buffered.end(i));
 }
 
 void FFmpegDemuxer::OnDataSourceError() {
   host_->OnDemuxerError(PIPELINE_ERROR_READ);
 }
 
 }  // namespace media