Support for MPEG-H 3D Audio bitstream pass-through via ffmpeg

This commit enables to support MPEG-H 3D Audio bitstream pass-through via ffmpeg for Cast products.
To build this code, it is required to merge latest ffmpeg code which contains following commits.
  https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/610473b9679bfd3aff56c6889927447da860beb1
  https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/30047b6a571daa0fbdfa4eb4d907e510ab56ca3f
  https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/632b8298b70969f6ab43509fd276b33295d9e336

MPEG-H 3D Audio pass-through with MSE was supported in
  https://chromium-review.googlesource.com/c/chromium/src/+/1011291

Change-Id: I43bf1cb1d73dc90be7e40dc2f0d1f5c49263cb15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1930369Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Yuki Tsuchiya <yuki.tsuchiya@sony.com>
Cr-Commit-Position: refs/heads/master@{#733953}

AUTHORS

@@ -1035,6 +1035,7 @@ Youngmin Yoo <youngmin.yoo@samsung.com>
 Youngsoo Choi <kenshin.choi@samsung.com>
 Youngsun Suh <zard17@gmail.com>
 Yuhong Sha <yuhong.sha@samsung.com>
+Yuki Tsuchiya <Yuki.Tsuchiya@sony.com>
 Yumikiyo Osanai <yumios.art@gmail.com>
 Yunchao He <yunchao.he@intel.com>
 Yupei Lin <yplam@yplam.com>

chromecast/public/media/decoder_config.h

@@ -362,11 +362,10 @@ inline bool IsValidConfig(const AudioConfig& config) {
          config.channel_layout != ChannelLayout::UNSUPPORTED &&
          config.sample_format >= kSampleFormatMin &&
          config.sample_format <= kSampleFormatMax &&
-         config.sample_format != kUnknownSampleFormat &&
-         (config.channel_number > 0 ||
+         ((config.sample_format != kUnknownSampleFormat &&
+           config.channel_number > 0 && config.bytes_per_channel > 0 &&
+           config.bytes_per_channel <= kMaxBytesPerSample) ||
           config.channel_layout == ChannelLayout::BITSTREAM) &&
-         config.bytes_per_channel > 0 &&
-         config.bytes_per_channel <= kMaxBytesPerSample &&
          config.samples_per_second > 0 &&
          config.samples_per_second <= kMaxSampleRate;
 }

media/ffmpeg/ffmpeg_common.cc

@@ -120,6 +120,10 @@ AudioCodec CodecIDToAudioCodec(AVCodecID codec_id) {
       return kCodecOpus;
     case AV_CODEC_ID_ALAC:
       return kCodecALAC;
+#if BUILDFLAG(ENABLE_PLATFORM_MPEG_H_AUDIO)
+    case AV_CODEC_ID_MPEGH_3D_AUDIO:
+      return kCodecMpegHAudio;
+#endif
     default:
       DVLOG(1) << "Unknown audio CodecID: " << codec_id;
   }
@@ -171,6 +175,10 @@ AVCodecID AudioCodecToCodecID(AudioCodec audio_codec,
       return AV_CODEC_ID_PCM_MULAW;
     case kCodecOpus:
       return AV_CODEC_ID_OPUS;
+#if BUILDFLAG(ENABLE_PLATFORM_MPEG_H_AUDIO)
+    case kCodecMpegHAudio:
+      return AV_CODEC_ID_MPEGH_3D_AUDIO;
+#endif
     default:
       DVLOG(1) << "Unknown AudioCodec: " << audio_codec;
   }
@@ -352,6 +360,12 @@ bool AVCodecContextToAudioDecoderConfig(const AVCodecContext* codec_context,
       NOTREACHED();
 #endif
       break;
+#if BUILDFLAG(ENABLE_PLATFORM_MPEG_H_AUDIO)
+    case kCodecMpegHAudio:
+      channel_layout = CHANNEL_LAYOUT_BITSTREAM;
+      sample_format = kSampleFormatMpegHAudio;
+      break;
+#endif
 
     default:
       break;
@@ -391,6 +405,10 @@ bool AVCodecContextToAudioDecoderConfig(const AVCodecContext* codec_context,
   if (codec == kCodecAC3 || codec == kCodecEAC3)
     return true;
 #endif
+#if BUILDFLAG(ENABLE_PLATFORM_MPEG_H_AUDIO)
+  if (codec == kCodecMpegHAudio)
+    return true;
+#endif
 
 #if BUILDFLAG(USE_PROPRIETARY_CODECS)
   // TODO(dalecurtis): Just use the profile from the codec context if ffmpeg