本页介绍了如何对转码的内容进行加密。Transcoder API 不会直接创建或管理加密密钥或许可。您必须使用第三方数字版权管理 (DRM) 提供商才能使用这些功能。为您的 Pod 创建加密密钥后 请将这些键传递给 Transcoder API Secret Manager。
加密设置是在
JobConfig
设置。Transcoder API 会使用提供的加密设置转码内容。输出清单包含解密
任意内容。
受支持的配置
流式传输协议 | 容器 | DRM 系统 | 加密架构 |
---|---|---|---|
HLS | TS | ClearKey | aes128 |
HLS | TS | FairPlay | sampleAes |
HLS | fMP4 | FairPlay | 仅限 mpegCenc cbcs |
MPEG-DASH | fMP4 | Widevine | mpegCenc cenc 或 cbcs |
MPEG-DASH | fMP4 | PlayReady | mpegCenc cenc 或 cbcs |
将加密密钥添加到 Secret Manager
开始之前,请使用第三方提供商创建加密密钥 选择的 DRM 提供商。
Transcoder API 要求您的密钥包含以下 JSON 格式的加密密钥以及其他必要信息。
请参阅 DRM 协议文档 以了解每个字段的说明。请注意,您需要将 JSON 格式从蛇形命名法转换为驼峰命名法。
示例 JSON
{
"encryptionKeys": [
{
// Key for FairPlay configuration.
"keyId": "d569cb35bd0548c7a99d92feb381df13",
"key": "f1967daca83e81f38d80aa741e7b32c2",
"iv": "8d80aa741e7b32c2f1967daca83e81f3",
"keyUri": "skd://d569cb35bd0548c7a99d92feb381df13",
"matchers": [
{
"muxStreams": ["ts_fairplay"]
}
]
},
{
// Key for Widevine configurations.
"keyId": "44ec248b048c43a6a6ee58a752c6f9f8",
"key": "f1967daca83e81f38d80aa741e7b32c2",
"keyUri": "skd://44ec248b048c43a6a6ee58a752c6f9f8",
"matchers": [
{
"muxStreams": [
"fmp4_widevine_cenc_video",
"fmp4_widevine_cenc_audio",
"fmp4_widevine_cbcs_video",
"fmp4_widevine_cbcs_audio"
]
}
]
},
{
// Key for PlayReady configurations.
"keyId": "8beed229709f480bb6004ec0f33e82d1",
"key": "ad20cd838f354dcc8a77c443d08ff09f",
"keyUri": "skd://8beed229709f480bb6004ec0f33e82d1",
"matchers": [
{
"muxStreams": [
"fmp4_playready_cenc_video",
"fmp4_playready_cenc_audio",
"fmp4_playready_cbcs_video",
"fmp4_playready_cbcs_audio"
]
}
]
},
{
// Key for all ClearKey configurations.
"keyId": "3d9dccb479c64adbb6e514790caa7822",
"key": "my-key",
// A URI that the media player can access
"keyUri": "https://example.com/keys/my-key.bin",
"iv": "8d80aa741e7b32c2f1967daca83e81f3"
// No `matchers` field. This is the default key to use when none of the keys above match.
}
]
}
如果您的加密配置(例如 FairPlay)需要显式初始化向量 (IV),但未包含该向量,则该 API 将使用 keyId
的值作为 iv
的值。
如需添加和配置加密密钥,请执行以下操作:
使用上述 JSON 数据,按照创建 Secret 中的步骤将加密密钥添加到 Secret Manager。
配置针对密钥的 IAM 权限,以便 Transcoder API 可以访问密钥内容。为此,请向
service-PROJECT_NUMBER@gcp-sa-transcoder.iam.gserviceaccount.com
服务账号授予secretmanager.secretAccessor
角色(这与服务账号拥有对 Cloud Storage 存储桶的访问权限的方式类似)。找到您创建的 Secret 版本的资源名称(例如,
projects/PROJECT_NUMBER/secrets/SECRET_ID/versions/VERSION_ID
)。 您需要使用此名称配置 Transcoder API 作业。对于 ClearKey 配置,
keyUri
字段必须引用 媒体播放器有权访问的 URI。执行以下操作:运行以下命令,使用密钥创建二进制文件:
echo "my-key" | xxd -r -p > my-key.bin
将文件上传到一个公共 URI 中。如需使用 Cloud Storage,请参阅 使用 Google Cloud 控制台发现对象存储服务。
创建作业
加密设置使用 JobConfig
级别 encryptions
数组中的对象指定。系统会为每个不同的配置分配一个唯一标识符 (id
)。每个 muxStream
均使用
来指明要使用的加密配置,或忽略该标识符
字段保持未加密状态。
JSON 格式
{
// Other JobConfig settings.
"encryptions": [
{
// Identifier for this encryption configuration, to be specified in muxStream(s).
"id": string,
// Configuration for secrets stored in Google Secret Manager.
"secretManagerKeySource": {
// The name of the Secret Version containing the encryption key.
// `projects/{project}/secrets/{secret_id}/versions/{version_number}`
// Using {version_number} of `latest` is not supported.
"secretVersion": string
},
// DRM system(s) that will be used. At least one must be specified. If a DRM system
// is omitted, it will be considered disabled.
"drmSystems": {
// Widevine configuration.
"widevine": {},
// FairPlay configuration.
"fairplay": {},
// PlayReady configuration.
"playready": {},
// ClearKey configuration.
"clearkey": {}
},
// Union field encryption_mode can be only one of the following:
// Configuration for HLS AES-128 encryption.
"aes128": {},
// Configuration for HLS SAMPLE-AES encryption.
"sampleAes": {},
// Configuration for MPEG-DASH Common Encryption (MPEG-CENC).
"mpegCenc": {
// Specify the encryption scheme. Supported schemes:
// - `cenc` - AES-CTR subsample
// - `cbcs`- AES-CBC subsample pattern
"scheme": string
}
// End of list of possible types for union field encryption_mode.
}
// Any other encryption configurations.
],
"muxStreams": [
{
// Unique identifier for the muxStream.
"key": string,
// Identifier of the encryption configuration for the muxStream.
"encryptionId": string
// … other muxStream settings.
}
// Other muxStreams.
],
// Other JobConfig settings.
}
示例 (ClearKey)
以下示例在 HLS 清单中配置了 AES-128 muxStream,在 DASH 清单中配置了 MPEG-CENC muxStream(cenc 和 cbcs):
"elementaryStreams": [
{
"key": "es_video",
"videoStream": {
"h264": {
"profile": "main",
"heightPixels": 600,
"widthPixels": 800,
"bitrateBps": 1000000,
"frameRate": 60,
},
},
},
{
"key": "es_audio",
"audioStream": {
"codec": "aac",
"channelCount": 2,
"bitrateBps": 160000
}
}
],
"encryptions": [
{
"id": "aes-128",
"secretManagerKeySource": {
"secretVersion": "projects/12345/secrets/key-1/versions/1"
},
"drmSystems": {"clearkey": {}},
"aes128": {}
},
{
"id": "cenc",
"secretManagerKeySource": {
"secretVersion": "projects/12345/secrets/key-1/versions/1"
},
"drmSystems": {"clearkey": {}},
"mpegCenc": {
"scheme": "cenc"
}
},
{
"id": "cbcs",
"secretManagerKeySource": {
"secretVersion": "projects/12345/secrets/key-1/versions/1"
},
"drmSystems": {"clearkey": {}},
"mpegCenc": {
"scheme": "cbcs"
}
}
],
"muxStreams": [
{
"key": "ts_aes128",
"container": "ts",
"elementaryStreams": ["es_video", "es_audio"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "aes-128"
},
{
"key": "fmp4_cenc_video",
"container": "fmp4",
"elementaryStreams": ["es_video"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "cenc"
},
{
"key": "fmp4_cenc_audio",
"container": "fmp4",
"elementaryStreams": ["es_audio"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "cenc"
},
{
"key": "fmp4_cbcs_video",
"container": "fmp4",
"elementaryStreams": ["es_video"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "cbcs"
},
{
"key": "fmp4_cbcs_audio",
"container": "fmp4",
"elementaryStreams": ["es_audio"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "cbcs"
}
],
"manifests": [
{
"fileName": "manifest_aes128.m3u8",
"type": "HLS",
"muxStreams": ["ts_aes128"]
},
{
"fileName": "manifest_cenc.mpd",
"type": "DASH",
"muxStreams": ["fmp4_cenc_video", "fmp4_cenc_audio"]
},
{
"fileName": "manifest_cbcs.mpd",
"type": "DASH",
"muxStreams": ["fmp4_cbcs_video", "fmp4_cbcs_audio"]
}
]
示例 (FP/PR/Widevine)
以下示例配置了 FairPlay/SAMPLE-AES、Widevine/MPEG-CENC (cenc 和 cbcs) 和 PlayReady/MPEG-CENC (cenc 和 cbcs) muxStreams。HLS 和 DASH 中包含 Widevine 和 PlayReady muxStream 清单。
"elementaryStreams": [
{
"key": "es_video",
"videoStream": {
"h264": {
"profile": "main",
"heightPixels": 600,
"widthPixels": 800,
"bitrateBps": 1000000,
"frameRate": 60,
},
},
},
{
"key": "es_audio",
"audioStream": {
"codec": "aac",
"channelCount": 2,
"bitrateBps": 160000
}
}
],
"encryptions": [
{
"id": "fairplay",
"secretManagerKeySource": {
"secretVersion": "projects/12345/secrets/key-1/versions/1"
},
"drmSystems": {"fairplay": {}},
"sampleAes": {}
},
{
"id": "widevine-cenc",
"secretManagerKeySource": {
"secretVersion": "projects/12345/secrets/key-1/versions/1"
},
"drmSystems": {"widevine": {}},
"mpegCenc": {
"scheme": "cenc"
}
},
{
"id": "widevine-cbcs",
"secretManagerKeySource": {
"secretVersion": "projects/12345/secrets/key-1/versions/1"
},
"drmSystems": {"widevine": {}},
"mpegCenc": {
"scheme": "cbcs"
}
},
{
"id": "playready-cenc",
"secretManagerKeySource": {
"secretVersion": "projects/12345/secrets/key-1/versions/1"
},
"drmSystems": {"playready": {}},
"mpegCenc": {
"scheme": "cenc"
}
},
{
"id": "playready-cbcs",
"secretManagerKeySource": {
"secretVersion": "projects/12345/secrets/key-1/versions/1"
},
"drmSystems": {"playready": {}},
"mpegCenc": {
"scheme": "cbcs"
}
}
],
"muxStreams": [
{
"key": "ts_fairplay",
"container": "ts",
"elementaryStreams": ["es_video", "es_audio"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "fairplay"
},
{
"key": "fmp4_widevine_cenc_video",
"container": "fmp4",
"elementaryStreams": ["es_video"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "widevine-cenc"
},
{
"key": "fmp4_widevine_cenc_audio",
"container": "fmp4",
"elementaryStreams": ["es_audio"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "widevine-cenc"
},
{
"key": "fmp4_widevine_cbcs_video",
"container": "fmp4",
"elementaryStreams": ["es_video"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "widevine-cbcs"
},
{
"key": "fmp4_widevine_cbcs_audio",
"container": "fmp4",
"elementaryStreams": ["es_audio"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "widevine-cbcs"
},
{
"key": "fmp4_playready_cenc_video",
"container": "fmp4",
"elementaryStreams": ["es_video"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "playready-cenc"
},
{
"key": "fmp4_playready_cenc_audio",
"container": "fmp4",
"elementaryStreams": ["es_audio"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "playready-cenc"
},
{
"key": "fmp4_playready_cbcs_video",
"container": "fmp4",
"elementaryStreams": ["es_video"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "playready-cbcs"
},
{
"key": "fmp4_playready_cbcs_audio",
"container": "fmp4",
"elementaryStreams": ["es_audio"],
"segmentSettings": {"segmentDuration": "2s"},
"encryptionId": "playready-cbcs"
}
],
"manifests": [
{
"fileName": "manifest_fairplay.m3u8",
"type": "HLS",
"muxStreams": ["ts_fairplay"]
},
{
"fileName": "manifest_widevine_cenc.m3u8",
"type": "HLS",
"muxStreams": ["fmp4_widevine_cenc_video", "fmp4_widevine_cenc_audio"]
},
{
"fileName": "manifest_widevine_cbcs.m3u8",
"type": "HLS",
"muxStreams": ["fmp4_widevine_cbcs_video", "fmp4_widevine_cbcs_audio"]
},
{
"fileName": "manifest_widevine_cenc.mpd",
"type": "DASH",
"muxStreams": ["fmp4_widevine_cenc_video", "fmp4_widevine_cenc_audio"]
},
{
"fileName": "manifest_widevine_cbcs.mpd",
"type": "DASH",
"muxStreams": ["fmp4_widevine_cbcs_video", "fmp4_widevine_cbcs_audio"]
},
{
"fileName": "manifest_playready_cenc.m3u8",
"type": "HLS",
"muxStreams": ["fmp4_playready_cenc_video", "fmp4_playready_cenc_audio"]
},
{
"fileName": "manifest_playready_cbcs.m3u8",
"type": "HLS",
"muxStreams": ["fmp4_playready_cbcs_video", "fmp4_playready_cbcs_audio"]
},
{
"fileName": "manifest_playready_cenc.mpd",
"type": "DASH",
"muxStreams": ["fmp4_playready_cenc_video", "fmp4_playready_cenc_audio"]
},
{
"fileName": "manifest_playready_cbcs.mpd",
"type": "DASH",
"muxStreams": ["fmp4_playready_cbcs_video", "fmp4_playready_cbcs_audio"]
}
]
确定要使用的 JSON 配置后,请照常创建作业。
监控输出
加密的输出流包含经过修改的清单,其中包含所需信息 解密要播放的内容。
清单示例
以下清单显示了解密关联内容所需的信息。
HLS AES-128/ClearKey
#EXTM3U
#EXT-X-VERSION:7
#EXT-X-TARGETDURATION:4
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-DISCONTINUITY-SEQUENCE:0
#EXT-X-KEY:METHOD=AES-128,URI="https://example.com/keys/3d9dccb479c64adbb6e514790caa7822.bin",IV=0x8d80aa741e7b32c2f1967daca83e81f3
#EXT-X-PROGRAM-DATE-TIME:2022-10-12T20:08:22.870Z
#EXTINF:2.576778
segment-0000000000.ts
#EXT-X-PROGRAM-DATE-TIME:2022-10-12T20:08:25.447Z
#EXTINF:2.000000
segment-0000000001.ts
#EXT-X-PROGRAM-DATE-TIME:2022-10-12T20:08:27.447Z
#EXTINF:2.000000
segment-0000000002.ts
#EXT-X-PROGRAM-DATE-TIME:2022-10-12T20:08:29.447Z
#EXTINF:2.000000
segment-0000000003.ts
HLS 示例-AES/FairPlay
#EXTM3U
#EXT-X-VERSION:7
#EXT-X-TARGETDURATION:4
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-DISCONTINUITY-SEQUENCE:0
#EXT-X-KEY:METHOD=SAMPLE-AES,URI="skd://d569cb35bd0548c7a99d92feb381df13",KEYFORMAT="com.apple.streamingkeydelivery",KEYFORMATVERSIONS="1"
#EXT-X-PROGRAM-DATE-TIME:2022-10-12T20:08:22.870Z
#EXTINF:2.576778
segment-0000000000.ts
#EXT-X-PROGRAM-DATE-TIME:2022-10-12T20:08:25.447Z
#EXTINF:2.000000
segment-0000000001.ts
#EXT-X-PROGRAM-DATE-TIME:2022-10-12T20:08:27.447Z
#EXTINF:2.000000
segment-0000000002.ts
#EXT-X-PROGRAM-DATE-TIME:2022-10-12T20:08:29.447Z
#EXTINF:2.000000
segment-0000000003.ts
DASH MPEG-CENC/Widevine
<AdaptationSet segmentAlignment="true" maxWidth="800" maxHeight="600">
<Representation mimeType="video/mp4" id="fmp4_widevine_cenc_video" codecs="avc1.4d001f">
<ContentProtection value="cenc" schemeIdUri="urn:mpeg:dash:mp4protection:2011" cenc:default_KID="44ec248b-048c-43a6-a6ee-58a752c6f9f8"/>
<ContentProtection schemeIdUri="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed" value="Widevine">
<cenc:pssh>AAAAOHBzc2gAAAAA7e+LqXnWSs6jCfc1R0h7QAAABgSEAB3Gcrj/8kFklokiVbJMh9VmwY=</cenc:pssh>
</ContentProtection>
</Representation>
</AdaptationSet>
<AdaptationSet segmentAlignment="true" mimeType="audio/mp4" id="1" label="fmp4_widevine_cenc_audio">
<Representation id="fmp4_widevine_cenc_audio" codecs="mp4a.40.2">
<ContentProtection value="cenc" schemeIdUri="urn:mpeg:dash:mp4protection:2011" cenc:default_KID="44ec248b-048c-43a6-a6ee-58a752c6f9f8"/>
<ContentProtection schemeIdUri="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed" value="Widevine">
<cenc:pssh>AAAAOHBzc2gAAAAA7e+LqXnWSs6jCfc1R0h7QAAABgSEAB3Gcrj/8kFklokiVbJMh9VmwY=</cenc:pssh>
</ContentProtection>
</Representation>
</AdaptationSet>
推荐的球员
建议使用基于 HLS.js
的播放器进行 HLS/TS 解密。建议使用基于 Shaka Player 的播放器进行 DASH/fMP4 解密。
搭载 Windows 10 且安装 Microsoft Edge 浏览器的实体机器、Xbox One(版本 1703 或更低版本)以及某些非 Windows 设备(例如智能电视)支持 PlayReady“cenc”方案。只有 Xbox One 1709 或更高版本支持 PlayReady“cbcs”方案。请参阅 PlayReady 内容加密模式 。