Emit Media Source codec names as media_log events.

media/base/audio_decoder_config.cc

Index: media/base/audio_decoder_config.cc
diff --git a/media/base/audio_decoder_config.cc b/media/base/audio_decoder_config.cc
index 06a1643f0a1ae4c2cf1b869dbf87fd9a02c42024..952cbf3ffde3782f5fc921b9a82aca8a32ba8d6d 100644
--- a/media/base/audio_decoder_config.cc
+++ b/media/base/audio_decoder_config.cc
@@ -13,6 +13,59 @@
 
 namespace media {
 
+// The names come from src/third_party/ffmpeg/libavcodec/codec_desc.c
+const char* AudioCodecName(AudioCodec audio_codec, SampleFormat sample_format) {
+  switch (audio_codec) {
+    case kCodecAAC:
+      return "aac";
+    case kCodecMP3:
+      return "mp3";
+    case kCodecPCM:
+      switch (sample_format) {

[DaleCurtis, 2014/11/19 00:01:56]

I wouldn't really worry about differentiating these, just saying pcm is fine.

[watk, 2014/11/19 19:18:09]

Done.

+        case kUnknownSampleFormat:
+          return "pcm";
+        case kSampleFormatU8:
+          return "pcm_u8";
+        case kSampleFormatS16:
+          return "pcm_s16le";
+        case kSampleFormatS32:
+          return "pcm_s24le";
+        case kSampleFormatF32:
+          return "pcm_f32le";
+        case kSampleFormatPlanarS16:
+          return "pcm_s16le_planar";
+        case kSampleFormatPlanarF32:
+          return "pcm_f32le_planar";
+        default:
+          NOTREACHED() << "Invalid SampleFormat: " << sample_format;
+          return "pcm";
+      }
+    case kCodecPCM_S16BE:
+      return "pcm_s16be";
+    case kCodecPCM_S24BE:
+      return "pcm_s24be";
+    case kCodecVorbis:
+      return "vorbis";
+    case kCodecFLAC:
+      return "flac";
+    case kCodecAMR_NB:
+      return "amr_nb";
+    case kCodecAMR_WB:
+      return "amr_wb";
+    case kCodecGSM_MS:
+      return "gsm_ms";
+    case kCodecPCM_ALAW:
+      return "pcm_alaw";
+    case kCodecPCM_MULAW:
+      return "pcm_mulaw";
+    case kCodecOpus:
+      return "opus";
+    default:
+      NOTREACHED() << "Invalid AudioCodec: " << audio_codec;
+      return "unknown";
+  }
+}
+
 AudioDecoderConfig::AudioDecoderConfig()
     : codec_(kUnknownAudioCodec),
       sample_format_(kUnknownSampleFormat),