starboard/shared/starboard/media/media_util.cc - cobalt - Git at Google

 // Copyright 2017 The Cobalt Authors. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 #include "starboard/shared/starboard/media/media_util.h"

 #include <cctype>

 #include "starboard/character.h"
 #include "starboard/common/log.h"
 #include "starboard/common/media.h"
 #include "starboard/common/string.h"
 #include "starboard/log.h"
 #include "starboard/memory.h"
 #include "starboard/shared/starboard/media/codec_util.h"
 #include "starboard/shared/starboard/media/media_support_internal.h"
 #include "starboard/shared/starboard/media/mime_type.h"

 namespace starboard {
 namespace shared {
 namespace starboard {
 namespace media {

 namespace {

 const int64_t kDefaultBitRate = 0;
 const int64_t kDefaultAudioChannels = 2;

 bool IsSupportedAudioCodec(const MimeType& mime_type,
                            const std::string& codec,
                            const char* key_system) {
   SbMediaAudioCodec audio_codec = GetAudioCodecFromString(codec.c_str());
   if (audio_codec == kSbMediaAudioCodecNone) {
     return false;
   }

   // TODO: allow platform-specific rejection of a combination of codec &
   // number of channels, by passing channels to SbMediaAudioIsSupported and /
   // or SbMediaIsSupported.

   if (strlen(key_system) != 0) {
     if (!SbMediaIsSupported(kSbMediaVideoCodecNone, audio_codec, key_system)) {
       return false;
     }
   }

   int channels = mime_type.GetParamIntValue("channels", kDefaultAudioChannels);
   if (!IsAudioOutputSupported(kSbMediaAudioCodingTypePcm, channels)) {
     return false;
   }

   int bitrate = mime_type.GetParamIntValue("bitrate", kDefaultBitRate);

   if (!SbMediaIsAudioSupported(audio_codec,
                                mime_type.raw_content_type().c_str(), bitrate)) {
     return false;
   }

   switch (audio_codec) {
     case kSbMediaAudioCodecNone:
       SB_NOTREACHED();
       return false;
     case kSbMediaAudioCodecAac:
       return mime_type.subtype() == "mp4";
     case kSbMediaAudioCodecAc3:
       if (!kSbHasAc3Audio) {
         SB_NOTREACHED() << "AC3 audio is not enabled on this platform. To "
                         << "enable it, set kSbHasAc3Audio to |true|.";
         return false;
       }
       return mime_type.subtype() == "mp4";
     case kSbMediaAudioCodecEac3:
       if (!kSbHasAc3Audio) {
         SB_NOTREACHED() << "AC3 audio is not enabled on this platform. To "
                         << "enable it, set kSbHasAc3Audio to |true|.";
         return false;
       }
       return mime_type.subtype() == "mp4";
     case kSbMediaAudioCodecOpus:
     case kSbMediaAudioCodecVorbis:
       return mime_type.subtype() == "webm";
 #if SB_API_VERSION >= 14
     case kSbMediaAudioCodecMp3:
       return mime_type.subtype() == "mpeg" || mime_type.subtype() == "mp3" ||
              mime_type.subtype() == "mp4";
     case kSbMediaAudioCodecPcm:
       return mime_type.subtype() == "wav" || mime_type.subtype() == "wave" ||
              mime_type.subtype() == "x-wav" ||
              mime_type.subtype() == "x-pn-wav";
     case kSbMediaAudioCodecFlac:
       return mime_type.subtype() == "ogg";
 #endif  // SB_API_VERSION >= 14
   }

   SB_NOTREACHED();
   return false;
 }

 bool IsSupportedVideoCodec(const MimeType& mime_type,
                            const std::string& codec,
                            const char* key_system,
                            bool decode_to_texture_required) {
   SbMediaVideoCodec video_codec;
   int profile = -1;
   int level = -1;
   int bit_depth = 8;
   SbMediaPrimaryId primary_id = kSbMediaPrimaryIdUnspecified;
   SbMediaTransferId transfer_id = kSbMediaTransferIdUnspecified;
   SbMediaMatrixId matrix_id = kSbMediaMatrixIdUnspecified;

   if (!ParseVideoCodec(codec.c_str(), &video_codec, &profile, &level,
                        &bit_depth, &primary_id, &transfer_id, &matrix_id)) {
     return false;
   }
   SB_DCHECK(video_codec != kSbMediaVideoCodecNone);

   if (strlen(key_system) != 0) {
     if (!SbMediaIsSupported(video_codec, kSbMediaAudioCodecNone, key_system)) {
       return false;
     }
   }

   std::string eotf = mime_type.GetParamStringValue("eotf", "");
   if (!eotf.empty()) {
     SbMediaTransferId transfer_id_from_eotf = GetTransferIdFromString(eotf);
     // If the eotf is not known, reject immediately - without checking with
     // the platform.
     if (transfer_id_from_eotf == kSbMediaTransferIdUnknown) {
       return false;
     }
     if (transfer_id != kSbMediaTransferIdUnspecified &&
         transfer_id != transfer_id_from_eotf) {
       SB_LOG_IF(WARNING, transfer_id != kSbMediaTransferIdUnspecified)
           << "transfer_id " << transfer_id << " set by the codec string \""
           << codec << "\" will be overwritten by the eotf attribute " << eotf;
     }
     transfer_id = transfer_id_from_eotf;
   }

   std::string cryptoblockformat =
       mime_type.GetParamStringValue("cryptoblockformat", "");
   if (!cryptoblockformat.empty()) {
     if (mime_type.subtype() != "webm" || cryptoblockformat != "subsample") {
       return false;
     }
   }

   int width = mime_type.GetParamIntValue("width", 0);
   int height = mime_type.GetParamIntValue("height", 0);
   int fps = mime_type.GetParamIntValue("framerate", 0);

   int bitrate = mime_type.GetParamIntValue("bitrate", kDefaultBitRate);

   if (width < 0 || height < 0 || fps < 0 || bitrate < 0) {
     return false;
   }

   if (!SbMediaIsVideoSupported(
           video_codec, mime_type.raw_content_type().c_str(), profile, level,
           bit_depth, primary_id, transfer_id, matrix_id, width, height, bitrate,
           fps, decode_to_texture_required)) {
     return false;
   }

   switch (video_codec) {
     case kSbMediaVideoCodecNone:
       SB_NOTREACHED();
       return false;
     case kSbMediaVideoCodecH264:
     case kSbMediaVideoCodecH265:
       return mime_type.subtype() == "mp4";
     case kSbMediaVideoCodecMpeg2:
     case kSbMediaVideoCodecTheora:
       return false;  // No associated container in YT.
     case kSbMediaVideoCodecVc1:
     case kSbMediaVideoCodecAv1:
       return mime_type.subtype() == "mp4";
     case kSbMediaVideoCodecVp8:
       return mime_type.subtype() == "webm";
     case kSbMediaVideoCodecVp9:
       return mime_type.subtype() == "mp4" || mime_type.subtype() == "webm";
   }

   SB_NOTREACHED();
   return false;
 }

 }  // namespace

 AudioSampleInfo::AudioSampleInfo() {
   memset(this, 0, sizeof(SbMediaAudioSampleInfo));
   codec = kSbMediaAudioCodecNone;
 }

 AudioSampleInfo::AudioSampleInfo(const SbMediaAudioSampleInfo& that) {
   *this = that;
 }

 AudioSampleInfo& AudioSampleInfo::operator=(
     const SbMediaAudioSampleInfo& that) {
   *static_cast<SbMediaAudioSampleInfo*>(this) = that;
   if (audio_specific_config_size > 0) {
     audio_specific_config_storage.resize(audio_specific_config_size);
     memcpy(audio_specific_config_storage.data(), audio_specific_config,
            audio_specific_config_size);
     audio_specific_config = audio_specific_config_storage.data();
   }

   if (codec == kSbMediaAudioCodecNone) {
     mime_storage.clear();
   } else {
     SB_DCHECK(that.mime);
     mime_storage = that.mime;
   }
   mime = mime_storage.c_str();

   return *this;
 }

 VideoSampleInfo::VideoSampleInfo() {
   memset(this, 0, sizeof(SbMediaAudioSampleInfo));
   codec = kSbMediaVideoCodecNone;
 }

 VideoSampleInfo::VideoSampleInfo(const SbMediaVideoSampleInfo& that) {
   *this = that;
 }

 VideoSampleInfo& VideoSampleInfo::operator=(
     const SbMediaVideoSampleInfo& that) {
   *static_cast<SbMediaVideoSampleInfo*>(this) = that;

   if (codec == kSbMediaVideoCodecNone) {
     mime_storage.clear();
     max_video_capabilities_storage.clear();
   } else {
     SB_DCHECK(that.mime);
     mime_storage = that.mime;
     max_video_capabilities_storage = that.max_video_capabilities;
   }
   mime = mime_storage.c_str();
   max_video_capabilities = max_video_capabilities_storage.c_str();

   return *this;
 }

 bool IsAudioOutputSupported(SbMediaAudioCodingType coding_type, int channels) {
   int count = SbMediaGetAudioOutputCount();

   for (int output_index = 0; output_index < count; ++output_index) {
     SbMediaAudioConfiguration configuration;
     if (!SbMediaGetAudioConfiguration(output_index, &configuration)) {
       continue;
     }

     if (configuration.coding_type == coding_type &&
         configuration.number_of_channels >= channels) {
       return true;
     }
   }

   return false;
 }

 bool IsSDRVideo(int bit_depth,
                 SbMediaPrimaryId primary_id,
                 SbMediaTransferId transfer_id,
                 SbMediaMatrixId matrix_id) {
   if (bit_depth != 8) {
     return false;
   }

   if (primary_id != kSbMediaPrimaryIdBt709 &&
       primary_id != kSbMediaPrimaryIdUnspecified &&
       primary_id != kSbMediaPrimaryIdSmpte170M) {
     return false;
   }

   if (transfer_id != kSbMediaTransferIdBt709 &&
       transfer_id != kSbMediaTransferIdUnspecified &&
       transfer_id != kSbMediaTransferIdSmpte170M) {
     return false;
   }

   if (matrix_id != kSbMediaMatrixIdBt709 &&
       matrix_id != kSbMediaMatrixIdUnspecified &&
       matrix_id != kSbMediaMatrixIdSmpte170M) {
     return false;
   }

   return true;
 }

 bool IsSDRVideo(const char* mime) {
   SB_DCHECK(mime);

   if (!mime) {
     SB_LOG(WARNING) << mime << " is empty, assuming sdr video.";
     return true;
   }

   MimeType mime_type(mime);
   if (!mime_type.is_valid()) {
     SB_LOG(WARNING) << mime << " is not a valid mime type, assuming sdr video.";
     return true;
   }
   const std::vector<std::string> codecs = mime_type.GetCodecs();
   if (codecs.empty()) {
     SB_LOG(WARNING) << mime << " contains no codecs, assuming sdr video.";
     return true;
   }
   if (codecs.size() > 1) {
     SB_LOG(WARNING) << mime
                     << " contains more than one codecs, assuming sdr video.";
     return true;
   }

   SbMediaVideoCodec video_codec;
   int profile = -1;
   int level = -1;
   int bit_depth = 8;
   SbMediaPrimaryId primary_id = kSbMediaPrimaryIdUnspecified;
   SbMediaTransferId transfer_id = kSbMediaTransferIdUnspecified;
   SbMediaMatrixId matrix_id = kSbMediaMatrixIdUnspecified;

   if (!ParseVideoCodec(codecs[0].c_str(), &video_codec, &profile, &level,
                        &bit_depth, &primary_id, &transfer_id, &matrix_id)) {
     SB_LOG(WARNING) << "ParseVideoCodec() failed on mime: " << mime
                     << ", assuming sdr video.";
     return true;
   }

   SB_DCHECK(video_codec != kSbMediaVideoCodecNone);
   // TODO: Consider to consolidate the two IsSDRVideo() implementations by
   //       calling IsSDRVideo(bit_depth, primary_id, transfer_id, matrix_id).
   return bit_depth == 8;
 }

 SbMediaTransferId GetTransferIdFromString(const std::string& transfer_id) {
   if (transfer_id == "bt709") {
     return kSbMediaTransferIdBt709;
   } else if (transfer_id == "smpte2084") {
     return kSbMediaTransferIdSmpteSt2084;
   } else if (transfer_id == "arib-std-b67") {
     return kSbMediaTransferIdAribStdB67;
   }
   return kSbMediaTransferIdUnknown;
 }

 int GetBytesPerSample(SbMediaAudioSampleType sample_type) {
   switch (sample_type) {
     case kSbMediaAudioSampleTypeInt16Deprecated:
       return 2;
     case kSbMediaAudioSampleTypeFloat32:
       return 4;
   }

   SB_NOTREACHED();
   return 4;
 }

 SbMediaSupportType CanPlayMimeAndKeySystem(const MimeType& mime_type,
                                            const char* key_system) {
   SB_DCHECK(mime_type.is_valid());

   if (mime_type.type() != "audio" && mime_type.type() != "video") {
     return kSbMediaSupportTypeNotSupported;
   }

   auto codecs = mime_type.GetCodecs();

   // Pre-filter for |key_system|.
   if (strlen(key_system) != 0) {
     if (!SbMediaIsSupported(kSbMediaVideoCodecNone, kSbMediaAudioCodecNone,
                             key_system)) {
       return kSbMediaSupportTypeNotSupported;
     }
   }

   bool decode_to_texture_required = false;
   std::string decode_to_texture_value =
       mime_type.GetParamStringValue("decode-to-texture", "false");
   if (decode_to_texture_value == "true") {
     decode_to_texture_required = true;
   } else if (decode_to_texture_value != "false") {
     // If an invalid value (e.g. not "true" or "false") is passed in for
     // decode-to-texture, trivially reject.
     return kSbMediaSupportTypeNotSupported;
   }

   if (codecs.size() == 0) {
     // This happens when the H5 player is either querying for progressive
     // playback support, or probing for generic mp4 support without specific
     // codecs.  We only support "audio/mp4" and "video/mp4" for these cases.
     if ((mime_type.type() == "audio" || mime_type.type() == "video") &&
         mime_type.subtype() == "mp4") {
       return kSbMediaSupportTypeMaybe;
     }
     return kSbMediaSupportTypeNotSupported;
   }

   if (codecs.size() > 2) {
     return kSbMediaSupportTypeNotSupported;
   }

   bool has_audio_codec = false;
   bool has_video_codec = false;
   for (const auto& codec : codecs) {
     if (IsSupportedAudioCodec(mime_type, codec, key_system)) {
       if (has_audio_codec) {
         // We don't support two audio codecs in one stream.
         return kSbMediaSupportTypeNotSupported;
       }
       has_audio_codec = true;
       continue;
     }
     if (IsSupportedVideoCodec(mime_type, codec, key_system,
                               decode_to_texture_required)) {
       if (mime_type.type() != "video") {
         // Video can only be contained in "video/*", while audio can be
         // contained in both "audio/*" and "video/*".
         return kSbMediaSupportTypeNotSupported;
       }
       if (has_video_codec) {
         // We don't support two video codecs in one stream.
         return kSbMediaSupportTypeNotSupported;
       }
       has_video_codec = true;
       continue;
     }
     return kSbMediaSupportTypeNotSupported;
   }

   if (has_audio_codec || has_video_codec) {
     return kSbMediaSupportTypeProbably;
   }
   return kSbMediaSupportTypeNotSupported;
 }

 std::string GetStringRepresentation(const uint8_t* data, const int size) {
   std::string result;

   for (int i = 0; i < size; ++i) {
     if (std::isspace(data[i])) {
       result += ' ';
     } else if (std::isprint(data[i])) {
       result += data[i];
     } else {
       result += '?';
     }
   }

   return result;
 }

 std::string GetMixedRepresentation(const uint8_t* data,
                                    const int size,
                                    const int bytes_per_line) {
   std::string result;

   for (int i = 0; i < size; i += bytes_per_line) {
     if (i + bytes_per_line <= size) {
       result += HexEncode(data + i, bytes_per_line);
       result += " | ";
       result += GetStringRepresentation(data + i, bytes_per_line);
       result += '\n';
     } else {
       int bytes_left = size - i;
       result += HexEncode(data + i, bytes_left);
       result += std::string((bytes_per_line - bytes_left) * 2, ' ');
       result += " | ";
       result += GetStringRepresentation(data + i, bytes_left);
       result += std::string(bytes_per_line - bytes_left, ' ');
       result += '\n';
     }
   }

   return result;
 }

 bool IsAudioSampleInfoSubstantiallyDifferent(
     const SbMediaAudioSampleInfo& left,
     const SbMediaAudioSampleInfo& right) {
   return left.codec != right.codec ||
          left.samples_per_second != right.samples_per_second ||
          left.number_of_channels != right.number_of_channels ||
          left.audio_specific_config_size != right.audio_specific_config_size ||
          memcmp(left.audio_specific_config, right.audio_specific_config,
                 left.audio_specific_config_size) != 0;
 }

 }  // namespace media
 }  // namespace starboard
 }  // namespace shared
 }  // namespace starboard

 bool operator==(const SbMediaColorMetadata& metadata_1,
                 const SbMediaColorMetadata& metadata_2) {
   return memcmp(&metadata_1, &metadata_2, sizeof(SbMediaColorMetadata)) == 0;
 }

 bool operator==(const SbMediaVideoSampleInfo& sample_info_1,
                 const SbMediaVideoSampleInfo& sample_info_2) {
   if (sample_info_1.codec != sample_info_2.codec) {
     return false;
   }
   if (sample_info_1.codec == kSbMediaVideoCodecNone) {
     return true;
   }

   if (strcmp(sample_info_1.mime, sample_info_2.mime) != 0) {
     return false;
   }
   if (strcmp(sample_info_1.max_video_capabilities,
              sample_info_2.max_video_capabilities) != 0) {
     return false;
   }

   if (sample_info_1.is_key_frame != sample_info_2.is_key_frame) {
     return false;
   }
   if (sample_info_1.frame_width != sample_info_2.frame_width) {
     return false;
   }
   if (sample_info_1.frame_height != sample_info_2.frame_height) {
     return false;
   }
   return sample_info_1.color_metadata == sample_info_2.color_metadata;
 }

 bool operator!=(const SbMediaColorMetadata& metadata_1,
                 const SbMediaColorMetadata& metadata_2) {
   return !(metadata_1 == metadata_2);
 }

 bool operator!=(const SbMediaVideoSampleInfo& sample_info_1,
                 const SbMediaVideoSampleInfo& sample_info_2) {
   return !(sample_info_1 == sample_info_2);
 }
	// Copyright 2017 The Cobalt Authors. All Rights Reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	#include "starboard/shared/starboard/media/media_util.h"

	#include <cctype>

	#include "starboard/character.h"
	#include "starboard/common/log.h"
	#include "starboard/common/media.h"
	#include "starboard/common/string.h"
	#include "starboard/log.h"
	#include "starboard/memory.h"
	#include "starboard/shared/starboard/media/codec_util.h"
	#include "starboard/shared/starboard/media/media_support_internal.h"
	#include "starboard/shared/starboard/media/mime_type.h"

	namespace starboard {
	namespace shared {
	namespace starboard {
	namespace media {

	namespace {

	const int64_t kDefaultBitRate = 0;
	const int64_t kDefaultAudioChannels = 2;

	bool IsSupportedAudioCodec(const MimeType& mime_type,
	const std::string& codec,
	const char* key_system) {
	SbMediaAudioCodec audio_codec = GetAudioCodecFromString(codec.c_str());
	if (audio_codec == kSbMediaAudioCodecNone) {
	return false;
	}

	// TODO: allow platform-specific rejection of a combination of codec &
	// number of channels, by passing channels to SbMediaAudioIsSupported and /
	// or SbMediaIsSupported.

	if (strlen(key_system) != 0) {
	if (!SbMediaIsSupported(kSbMediaVideoCodecNone, audio_codec, key_system)) {
	return false;
	}
	}

	int channels = mime_type.GetParamIntValue("channels", kDefaultAudioChannels);
	if (!IsAudioOutputSupported(kSbMediaAudioCodingTypePcm, channels)) {
	return false;
	}

	int bitrate = mime_type.GetParamIntValue("bitrate", kDefaultBitRate);

	if (!SbMediaIsAudioSupported(audio_codec,
	mime_type.raw_content_type().c_str(), bitrate)) {
	return false;
	}

	switch (audio_codec) {
	case kSbMediaAudioCodecNone:
	SB_NOTREACHED();
	return false;
	case kSbMediaAudioCodecAac:
	return mime_type.subtype() == "mp4";
	case kSbMediaAudioCodecAc3:
	if (!kSbHasAc3Audio) {
	SB_NOTREACHED() << "AC3 audio is not enabled on this platform. To "
	<< "enable it, set kSbHasAc3Audio to \|true\|.";
	return false;
	}
	return mime_type.subtype() == "mp4";
	case kSbMediaAudioCodecEac3:
	if (!kSbHasAc3Audio) {
	SB_NOTREACHED() << "AC3 audio is not enabled on this platform. To "
	<< "enable it, set kSbHasAc3Audio to \|true\|.";
	return false;
	}
	return mime_type.subtype() == "mp4";
	case kSbMediaAudioCodecOpus:
	case kSbMediaAudioCodecVorbis:
	return mime_type.subtype() == "webm";
	#if SB_API_VERSION >= 14
	case kSbMediaAudioCodecMp3:
	return mime_type.subtype() == "mpeg" \|\| mime_type.subtype() == "mp3" \|\|
	mime_type.subtype() == "mp4";
	case kSbMediaAudioCodecPcm:
	return mime_type.subtype() == "wav" \|\| mime_type.subtype() == "wave" \|\|
	mime_type.subtype() == "x-wav" \|\|
	mime_type.subtype() == "x-pn-wav";
	case kSbMediaAudioCodecFlac:
	return mime_type.subtype() == "ogg";
	#endif // SB_API_VERSION >= 14
	}

	SB_NOTREACHED();
	return false;
	}

	bool IsSupportedVideoCodec(const MimeType& mime_type,
	const std::string& codec,
	const char* key_system,
	bool decode_to_texture_required) {
	SbMediaVideoCodec video_codec;
	int profile = -1;
	int level = -1;
	int bit_depth = 8;
	SbMediaPrimaryId primary_id = kSbMediaPrimaryIdUnspecified;
	SbMediaTransferId transfer_id = kSbMediaTransferIdUnspecified;
	SbMediaMatrixId matrix_id = kSbMediaMatrixIdUnspecified;

	if (!ParseVideoCodec(codec.c_str(), &video_codec, &profile, &level,
	&bit_depth, &primary_id, &transfer_id, &matrix_id)) {
	return false;
	}
	SB_DCHECK(video_codec != kSbMediaVideoCodecNone);

	if (strlen(key_system) != 0) {
	if (!SbMediaIsSupported(video_codec, kSbMediaAudioCodecNone, key_system)) {
	return false;
	}
	}

	std::string eotf = mime_type.GetParamStringValue("eotf", "");
	if (!eotf.empty()) {
	SbMediaTransferId transfer_id_from_eotf = GetTransferIdFromString(eotf);
	// If the eotf is not known, reject immediately - without checking with
	// the platform.
	if (transfer_id_from_eotf == kSbMediaTransferIdUnknown) {
	return false;
	}
	if (transfer_id != kSbMediaTransferIdUnspecified &&
	transfer_id != transfer_id_from_eotf) {
	SB_LOG_IF(WARNING, transfer_id != kSbMediaTransferIdUnspecified)
	<< "transfer_id " << transfer_id << " set by the codec string \""
	<< codec << "\" will be overwritten by the eotf attribute " << eotf;
	}
	transfer_id = transfer_id_from_eotf;
	}

	std::string cryptoblockformat =
	mime_type.GetParamStringValue("cryptoblockformat", "");
	if (!cryptoblockformat.empty()) {
	if (mime_type.subtype() != "webm" \|\| cryptoblockformat != "subsample") {
	return false;
	}
	}

	int width = mime_type.GetParamIntValue("width", 0);
	int height = mime_type.GetParamIntValue("height", 0);
	int fps = mime_type.GetParamIntValue("framerate", 0);

	int bitrate = mime_type.GetParamIntValue("bitrate", kDefaultBitRate);

	if (width < 0 \|\| height < 0 \|\| fps < 0 \|\| bitrate < 0) {
	return false;
	}

	if (!SbMediaIsVideoSupported(
	video_codec, mime_type.raw_content_type().c_str(), profile, level,
	bit_depth, primary_id, transfer_id, matrix_id, width, height, bitrate,
	fps, decode_to_texture_required)) {
	return false;
	}

	switch (video_codec) {
	case kSbMediaVideoCodecNone:
	SB_NOTREACHED();
	return false;
	case kSbMediaVideoCodecH264:
	case kSbMediaVideoCodecH265:
	return mime_type.subtype() == "mp4";
	case kSbMediaVideoCodecMpeg2:
	case kSbMediaVideoCodecTheora:
	return false; // No associated container in YT.
	case kSbMediaVideoCodecVc1:
	case kSbMediaVideoCodecAv1:
	return mime_type.subtype() == "mp4";
	case kSbMediaVideoCodecVp8:
	return mime_type.subtype() == "webm";
	case kSbMediaVideoCodecVp9:
	return mime_type.subtype() == "mp4" \|\| mime_type.subtype() == "webm";
	}

	SB_NOTREACHED();
	return false;
	}

	} // namespace

	AudioSampleInfo::AudioSampleInfo() {
	memset(this, 0, sizeof(SbMediaAudioSampleInfo));
	codec = kSbMediaAudioCodecNone;
	}

	AudioSampleInfo::AudioSampleInfo(const SbMediaAudioSampleInfo& that) {
	*this = that;
	}

	AudioSampleInfo& AudioSampleInfo::operator=(
	const SbMediaAudioSampleInfo& that) {
	static_cast<SbMediaAudioSampleInfo>(this) = that;
	if (audio_specific_config_size > 0) {
	audio_specific_config_storage.resize(audio_specific_config_size);
	memcpy(audio_specific_config_storage.data(), audio_specific_config,
	audio_specific_config_size);
	audio_specific_config = audio_specific_config_storage.data();
	}

	if (codec == kSbMediaAudioCodecNone) {
	mime_storage.clear();
	} else {
	SB_DCHECK(that.mime);
	mime_storage = that.mime;
	}
	mime = mime_storage.c_str();

	return *this;
	}

	VideoSampleInfo::VideoSampleInfo() {
	memset(this, 0, sizeof(SbMediaAudioSampleInfo));
	codec = kSbMediaVideoCodecNone;
	}

	VideoSampleInfo::VideoSampleInfo(const SbMediaVideoSampleInfo& that) {
	*this = that;
	}

	VideoSampleInfo& VideoSampleInfo::operator=(
	const SbMediaVideoSampleInfo& that) {
	static_cast<SbMediaVideoSampleInfo>(this) = that;

	if (codec == kSbMediaVideoCodecNone) {
	mime_storage.clear();
	max_video_capabilities_storage.clear();
	} else {
	SB_DCHECK(that.mime);
	mime_storage = that.mime;
	max_video_capabilities_storage = that.max_video_capabilities;
	}
	mime = mime_storage.c_str();
	max_video_capabilities = max_video_capabilities_storage.c_str();

	return *this;
	}

	bool IsAudioOutputSupported(SbMediaAudioCodingType coding_type, int channels) {
	int count = SbMediaGetAudioOutputCount();

	for (int output_index = 0; output_index < count; ++output_index) {
	SbMediaAudioConfiguration configuration;
	if (!SbMediaGetAudioConfiguration(output_index, &configuration)) {
	continue;
	}

	if (configuration.coding_type == coding_type &&
	configuration.number_of_channels >= channels) {
	return true;
	}
	}

	return false;
	}

	bool IsSDRVideo(int bit_depth,
	SbMediaPrimaryId primary_id,
	SbMediaTransferId transfer_id,
	SbMediaMatrixId matrix_id) {
	if (bit_depth != 8) {
	return false;
	}

	if (primary_id != kSbMediaPrimaryIdBt709 &&
	primary_id != kSbMediaPrimaryIdUnspecified &&
	primary_id != kSbMediaPrimaryIdSmpte170M) {
	return false;
	}

	if (transfer_id != kSbMediaTransferIdBt709 &&
	transfer_id != kSbMediaTransferIdUnspecified &&
	transfer_id != kSbMediaTransferIdSmpte170M) {
	return false;
	}

	if (matrix_id != kSbMediaMatrixIdBt709 &&
	matrix_id != kSbMediaMatrixIdUnspecified &&
	matrix_id != kSbMediaMatrixIdSmpte170M) {
	return false;
	}

	return true;
	}

	bool IsSDRVideo(const char* mime) {
	SB_DCHECK(mime);

	if (!mime) {
	SB_LOG(WARNING) << mime << " is empty, assuming sdr video.";
	return true;
	}

	MimeType mime_type(mime);
	if (!mime_type.is_valid()) {
	SB_LOG(WARNING) << mime << " is not a valid mime type, assuming sdr video.";
	return true;
	}
	const std::vector<std::string> codecs = mime_type.GetCodecs();
	if (codecs.empty()) {
	SB_LOG(WARNING) << mime << " contains no codecs, assuming sdr video.";
	return true;
	}
	if (codecs.size() > 1) {
	SB_LOG(WARNING) << mime
	<< " contains more than one codecs, assuming sdr video.";
	return true;
	}

	SbMediaVideoCodec video_codec;
	int profile = -1;
	int level = -1;
	int bit_depth = 8;
	SbMediaPrimaryId primary_id = kSbMediaPrimaryIdUnspecified;
	SbMediaTransferId transfer_id = kSbMediaTransferIdUnspecified;
	SbMediaMatrixId matrix_id = kSbMediaMatrixIdUnspecified;

	if (!ParseVideoCodec(codecs[0].c_str(), &video_codec, &profile, &level,
	&bit_depth, &primary_id, &transfer_id, &matrix_id)) {
	SB_LOG(WARNING) << "ParseVideoCodec() failed on mime: " << mime
	<< ", assuming sdr video.";
	return true;
	}

	SB_DCHECK(video_codec != kSbMediaVideoCodecNone);
	// TODO: Consider to consolidate the two IsSDRVideo() implementations by
	// calling IsSDRVideo(bit_depth, primary_id, transfer_id, matrix_id).
	return bit_depth == 8;
	}

	SbMediaTransferId GetTransferIdFromString(const std::string& transfer_id) {
	if (transfer_id == "bt709") {
	return kSbMediaTransferIdBt709;
	} else if (transfer_id == "smpte2084") {
	return kSbMediaTransferIdSmpteSt2084;
	} else if (transfer_id == "arib-std-b67") {
	return kSbMediaTransferIdAribStdB67;
	}
	return kSbMediaTransferIdUnknown;
	}

	int GetBytesPerSample(SbMediaAudioSampleType sample_type) {
	switch (sample_type) {
	case kSbMediaAudioSampleTypeInt16Deprecated:
	return 2;
	case kSbMediaAudioSampleTypeFloat32:
	return 4;
	}

	SB_NOTREACHED();
	return 4;
	}

	SbMediaSupportType CanPlayMimeAndKeySystem(const MimeType& mime_type,
	const char* key_system) {
	SB_DCHECK(mime_type.is_valid());

	if (mime_type.type() != "audio" && mime_type.type() != "video") {
	return kSbMediaSupportTypeNotSupported;
	}

	auto codecs = mime_type.GetCodecs();

	// Pre-filter for \|key_system\|.
	if (strlen(key_system) != 0) {
	if (!SbMediaIsSupported(kSbMediaVideoCodecNone, kSbMediaAudioCodecNone,
	key_system)) {
	return kSbMediaSupportTypeNotSupported;
	}
	}

	bool decode_to_texture_required = false;
	std::string decode_to_texture_value =
	mime_type.GetParamStringValue("decode-to-texture", "false");
	if (decode_to_texture_value == "true") {
	decode_to_texture_required = true;
	} else if (decode_to_texture_value != "false") {
	// If an invalid value (e.g. not "true" or "false") is passed in for
	// decode-to-texture, trivially reject.
	return kSbMediaSupportTypeNotSupported;
	}

	if (codecs.size() == 0) {
	// This happens when the H5 player is either querying for progressive
	// playback support, or probing for generic mp4 support without specific
	// codecs. We only support "audio/mp4" and "video/mp4" for these cases.
	if ((mime_type.type() == "audio" \|\| mime_type.type() == "video") &&
	mime_type.subtype() == "mp4") {
	return kSbMediaSupportTypeMaybe;
	}
	return kSbMediaSupportTypeNotSupported;
	}

	if (codecs.size() > 2) {
	return kSbMediaSupportTypeNotSupported;
	}

	bool has_audio_codec = false;
	bool has_video_codec = false;
	for (const auto& codec : codecs) {
	if (IsSupportedAudioCodec(mime_type, codec, key_system)) {
	if (has_audio_codec) {
	// We don't support two audio codecs in one stream.
	return kSbMediaSupportTypeNotSupported;
	}
	has_audio_codec = true;
	continue;
	}
	if (IsSupportedVideoCodec(mime_type, codec, key_system,
	decode_to_texture_required)) {
	if (mime_type.type() != "video") {
	// Video can only be contained in "video/*", while audio can be
	// contained in both "audio/" and "video/".
	return kSbMediaSupportTypeNotSupported;
	}
	if (has_video_codec) {
	// We don't support two video codecs in one stream.
	return kSbMediaSupportTypeNotSupported;
	}
	has_video_codec = true;
	continue;
	}
	return kSbMediaSupportTypeNotSupported;
	}

	if (has_audio_codec \|\| has_video_codec) {
	return kSbMediaSupportTypeProbably;
	}
	return kSbMediaSupportTypeNotSupported;
	}

	std::string GetStringRepresentation(const uint8_t* data, const int size) {
	std::string result;

	for (int i = 0; i < size; ++i) {
	if (std::isspace(data[i])) {
	result += ' ';
	} else if (std::isprint(data[i])) {
	result += data[i];
	} else {
	result += '?';
	}
	}

	return result;
	}

	std::string GetMixedRepresentation(const uint8_t* data,
	const int size,
	const int bytes_per_line) {
	std::string result;

	for (int i = 0; i < size; i += bytes_per_line) {
	if (i + bytes_per_line <= size) {
	result += HexEncode(data + i, bytes_per_line);
	result += " \| ";
	result += GetStringRepresentation(data + i, bytes_per_line);
	result += '\n';
	} else {
	int bytes_left = size - i;
	result += HexEncode(data + i, bytes_left);
	result += std::string((bytes_per_line - bytes_left) * 2, ' ');
	result += " \| ";
	result += GetStringRepresentation(data + i, bytes_left);
	result += std::string(bytes_per_line - bytes_left, ' ');
	result += '\n';
	}
	}

	return result;
	}

	bool IsAudioSampleInfoSubstantiallyDifferent(
	const SbMediaAudioSampleInfo& left,
	const SbMediaAudioSampleInfo& right) {
	return left.codec != right.codec \|\|
	left.samples_per_second != right.samples_per_second \|\|
	left.number_of_channels != right.number_of_channels \|\|
	left.audio_specific_config_size != right.audio_specific_config_size \|\|
	memcmp(left.audio_specific_config, right.audio_specific_config,
	left.audio_specific_config_size) != 0;
	}

	} // namespace media
	} // namespace starboard
	} // namespace shared
	} // namespace starboard

	bool operator==(const SbMediaColorMetadata& metadata_1,
	const SbMediaColorMetadata& metadata_2) {
	return memcmp(&metadata_1, &metadata_2, sizeof(SbMediaColorMetadata)) == 0;
	}

	bool operator==(const SbMediaVideoSampleInfo& sample_info_1,
	const SbMediaVideoSampleInfo& sample_info_2) {
	if (sample_info_1.codec != sample_info_2.codec) {
	return false;
	}
	if (sample_info_1.codec == kSbMediaVideoCodecNone) {
	return true;
	}

	if (strcmp(sample_info_1.mime, sample_info_2.mime) != 0) {
	return false;
	}
	if (strcmp(sample_info_1.max_video_capabilities,
	sample_info_2.max_video_capabilities) != 0) {
	return false;
	}

	if (sample_info_1.is_key_frame != sample_info_2.is_key_frame) {
	return false;
	}
	if (sample_info_1.frame_width != sample_info_2.frame_width) {
	return false;
	}
	if (sample_info_1.frame_height != sample_info_2.frame_height) {
	return false;
	}
	return sample_info_1.color_metadata == sample_info_2.color_metadata;
	}

	bool operator!=(const SbMediaColorMetadata& metadata_1,
	const SbMediaColorMetadata& metadata_2) {
	return !(metadata_1 == metadata_2);
	}

	bool operator!=(const SbMediaVideoSampleInfo& sample_info_1,
	const SbMediaVideoSampleInfo& sample_info_2) {
	return !(sample_info_1 == sample_info_2);
	}