media/libstagefright/DRMExtractor.cpp - platform/frameworks/av - Git at Google

 /*
  * Copyright (C) 2010 The Android Open Source Project
  *
  * 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 "include/DRMExtractor.h"

 #include <arpa/inet.h>
 #include <utils/String8.h>
 #include <media/stagefright/foundation/ADebug.h>
 #include <media/stagefright/Utils.h>
 #include <media/stagefright/DataSource.h>
 #include <media/stagefright/MediaSource.h>
 #include <media/stagefright/MediaDefs.h>
 #include <media/stagefright/MetaData.h>
 #include <media/stagefright/MediaErrors.h>
 #include <media/stagefright/MediaBuffer.h>

 #include <drm/drm_framework_common.h>
 #include <utils/Errors.h>


 namespace android {

 class DRMSource : public MediaSource {
 public:
     DRMSource(const sp<MediaSource> &mediaSource,
             const sp<DecryptHandle> &decryptHandle,
             DrmManagerClient *managerClient,
             int32_t trackId, DrmBuffer *ipmpBox);

     virtual status_t start(MetaData *params = NULL);
     virtual status_t stop();
     virtual sp<MetaData> getFormat();
     virtual status_t read(
             MediaBuffer **buffer, const ReadOptions *options = NULL);

 protected:
     virtual ~DRMSource();

 private:
     sp<MediaSource> mOriginalMediaSource;
     sp<DecryptHandle> mDecryptHandle;
     DrmManagerClient* mDrmManagerClient;
     size_t mTrackId;
     mutable Mutex mDRMLock;
     size_t mNALLengthSize;
     bool mWantsNALFragments;

     DRMSource(const DRMSource &);
     DRMSource &operator=(const DRMSource &);
 };

 ////////////////////////////////////////////////////////////////////////////////

 DRMSource::DRMSource(const sp<MediaSource> &mediaSource,
         const sp<DecryptHandle> &decryptHandle,
         DrmManagerClient *managerClient,
         int32_t trackId, DrmBuffer *ipmpBox)
     : mOriginalMediaSource(mediaSource),
       mDecryptHandle(decryptHandle),
       mDrmManagerClient(managerClient),
       mTrackId(trackId),
       mNALLengthSize(0),
       mWantsNALFragments(false) {
     CHECK(mDrmManagerClient);
     mDrmManagerClient->initializeDecryptUnit(
             mDecryptHandle, trackId, ipmpBox);

     const char *mime;
     bool success = getFormat()->findCString(kKeyMIMEType, &mime);
     CHECK(success);

     if (!strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC)) {
         uint32_t type;
         const void *data;
         size_t size;
         CHECK(getFormat()->findData(kKeyAVCC, &type, &data, &size));

         const uint8_t *ptr = (const uint8_t *)data;

         CHECK(size >= 7);
         CHECK_EQ(ptr[0], 1);  // configurationVersion == 1

         // The number of bytes used to encode the length of a NAL unit.
         mNALLengthSize = 1 + (ptr[4] & 3);
     }
 }

 DRMSource::~DRMSource() {
     Mutex::Autolock autoLock(mDRMLock);
     mDrmManagerClient->finalizeDecryptUnit(mDecryptHandle, mTrackId);
 }

 status_t DRMSource::start(MetaData *params) {
     int32_t val;
     if (params && params->findInt32(kKeyWantsNALFragments, &val)
         && val != 0) {
         mWantsNALFragments = true;
     } else {
         mWantsNALFragments = false;
     }

    return mOriginalMediaSource->start(params);
 }

 status_t DRMSource::stop() {
     return mOriginalMediaSource->stop();
 }

 sp<MetaData> DRMSource::getFormat() {
     return mOriginalMediaSource->getFormat();
 }

 status_t DRMSource::read(MediaBuffer **buffer, const ReadOptions *options) {
     Mutex::Autolock autoLock(mDRMLock);
     status_t err;
     if ((err = mOriginalMediaSource->read(buffer, options)) != OK) {
         return err;
     }

     size_t len = (*buffer)->range_length();

     char *src = (char *)(*buffer)->data() + (*buffer)->range_offset();

     DrmBuffer encryptedDrmBuffer(src, len);
     DrmBuffer decryptedDrmBuffer;
     decryptedDrmBuffer.length = len;
     decryptedDrmBuffer.data = new char[len];
     DrmBuffer *pDecryptedDrmBuffer = &decryptedDrmBuffer;

     if ((err = mDrmManagerClient->decrypt(mDecryptHandle, mTrackId,
             &encryptedDrmBuffer, &pDecryptedDrmBuffer)) != NO_ERROR) {

         if (decryptedDrmBuffer.data) {
             delete [] decryptedDrmBuffer.data;
             decryptedDrmBuffer.data = NULL;
         }

         return err;
     }
     CHECK(pDecryptedDrmBuffer == &decryptedDrmBuffer);

     const char *mime;
     CHECK(getFormat()->findCString(kKeyMIMEType, &mime));

     if (!strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC) && !mWantsNALFragments) {
         uint8_t *dstData = (uint8_t*)src;
         size_t srcOffset = 0;
         size_t dstOffset = 0;

         len = decryptedDrmBuffer.length;
         while (srcOffset < len) {
             CHECK(srcOffset + mNALLengthSize <= len);
             size_t nalLength = 0;
             const uint8_t* data = (const uint8_t*)(&decryptedDrmBuffer.data[srcOffset]);

             switch (mNALLengthSize) {
                 case 1:
                     nalLength = *data;
                     break;
                 case 2:
                     nalLength = U16_AT(data);
                     break;
                 case 3:
                     nalLength = ((size_t)data[0] << 16) | U16_AT(&data[1]);
                     break;
                 case 4:
                     nalLength = U32_AT(data);
                     break;
                 default:
                     CHECK(!"Should not be here.");
                     break;
             }

             srcOffset += mNALLengthSize;

             if (srcOffset + nalLength > len) {
                 if (decryptedDrmBuffer.data) {
                     delete [] decryptedDrmBuffer.data;
                     decryptedDrmBuffer.data = NULL;
                 }

                 return ERROR_MALFORMED;
             }

             if (nalLength == 0) {
                 continue;
             }

             CHECK(dstOffset + 4 <= (*buffer)->size());

             dstData[dstOffset++] = 0;
             dstData[dstOffset++] = 0;
             dstData[dstOffset++] = 0;
             dstData[dstOffset++] = 1;
             memcpy(&dstData[dstOffset], &decryptedDrmBuffer.data[srcOffset], nalLength);
             srcOffset += nalLength;
             dstOffset += nalLength;
         }

         CHECK_EQ(srcOffset, len);
         (*buffer)->set_range((*buffer)->range_offset(), dstOffset);

     } else {
         memcpy(src, decryptedDrmBuffer.data, decryptedDrmBuffer.length);
         (*buffer)->set_range((*buffer)->range_offset(), decryptedDrmBuffer.length);
     }

     if (decryptedDrmBuffer.data) {
         delete [] decryptedDrmBuffer.data;
         decryptedDrmBuffer.data = NULL;
     }

     return OK;
 }

 ////////////////////////////////////////////////////////////////////////////////

 DRMExtractor::DRMExtractor(const sp<DataSource> &source, const char* mime)
     : mDataSource(source),
       mDecryptHandle(NULL),
       mDrmManagerClient(NULL) {
     mOriginalExtractor = MediaExtractor::Create(source, mime);
     mOriginalExtractor->setDrmFlag(true);
     mOriginalExtractor->getMetaData()->setInt32(kKeyIsDRM, 1);

     source->getDrmInfo(mDecryptHandle, &mDrmManagerClient);
 }

 DRMExtractor::~DRMExtractor() {
 }

 size_t DRMExtractor::countTracks() {
     return mOriginalExtractor->countTracks();
 }

 sp<MediaSource> DRMExtractor::getTrack(size_t index) {
     sp<MediaSource> originalMediaSource = mOriginalExtractor->getTrack(index);
     originalMediaSource->getFormat()->setInt32(kKeyIsDRM, 1);

     int32_t trackID;
     CHECK(getTrackMetaData(index, 0)->findInt32(kKeyTrackID, &trackID));

     DrmBuffer ipmpBox;
     ipmpBox.data = mOriginalExtractor->getDrmTrackInfo(trackID, &(ipmpBox.length));
     CHECK(ipmpBox.length > 0);

     return new DRMSource(originalMediaSource, mDecryptHandle, mDrmManagerClient,
             trackID, &ipmpBox);
 }

 sp<MetaData> DRMExtractor::getTrackMetaData(size_t index, uint32_t flags) {
     return mOriginalExtractor->getTrackMetaData(index, flags);
 }

 sp<MetaData> DRMExtractor::getMetaData() {
     return mOriginalExtractor->getMetaData();
 }

 bool SniffDRM(
     const sp<DataSource> &source, String8 *mimeType, float *confidence,
         sp<AMessage> *) {
     sp<DecryptHandle> decryptHandle = source->DrmInitialization();

     if (decryptHandle != NULL) {
         if (decryptHandle->decryptApiType == DecryptApiType::CONTAINER_BASED) {
             *mimeType = String8("drm+container_based+") + decryptHandle->mimeType;
             *confidence = 10.0f;
         } else if (decryptHandle->decryptApiType == DecryptApiType::ELEMENTARY_STREAM_BASED) {
             *mimeType = String8("drm+es_based+") + decryptHandle->mimeType;
             *confidence = 10.0f;
         } else {
             return false;
         }

         return true;
     }

     return false;
 }
 } //namespace android
	/*
	* Copyright (C) 2010 The Android Open Source Project
	*
	* 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 "include/DRMExtractor.h"

	#include <arpa/inet.h>
	#include <utils/String8.h>
	#include <media/stagefright/foundation/ADebug.h>
	#include <media/stagefright/Utils.h>
	#include <media/stagefright/DataSource.h>
	#include <media/stagefright/MediaSource.h>
	#include <media/stagefright/MediaDefs.h>
	#include <media/stagefright/MetaData.h>
	#include <media/stagefright/MediaErrors.h>
	#include <media/stagefright/MediaBuffer.h>

	#include <drm/drm_framework_common.h>
	#include <utils/Errors.h>


	namespace android {

	class DRMSource : public MediaSource {
	public:
	DRMSource(const sp<MediaSource> &mediaSource,
	const sp<DecryptHandle> &decryptHandle,
	DrmManagerClient *managerClient,
	int32_t trackId, DrmBuffer *ipmpBox);

	virtual status_t start(MetaData *params = NULL);
	virtual status_t stop();
	virtual sp<MetaData> getFormat();
	virtual status_t read(
	MediaBuffer *buffer, const ReadOptions options = NULL);

	protected:
	virtual ~DRMSource();

	private:
	sp<MediaSource> mOriginalMediaSource;
	sp<DecryptHandle> mDecryptHandle;
	DrmManagerClient* mDrmManagerClient;
	size_t mTrackId;
	mutable Mutex mDRMLock;
	size_t mNALLengthSize;
	bool mWantsNALFragments;

	DRMSource(const DRMSource &);
	DRMSource &operator=(const DRMSource &);
	};

	////////////////////////////////////////////////////////////////////////////////

	DRMSource::DRMSource(const sp<MediaSource> &mediaSource,
	const sp<DecryptHandle> &decryptHandle,
	DrmManagerClient *managerClient,
	int32_t trackId, DrmBuffer *ipmpBox)
	: mOriginalMediaSource(mediaSource),
	mDecryptHandle(decryptHandle),
	mDrmManagerClient(managerClient),
	mTrackId(trackId),
	mNALLengthSize(0),
	mWantsNALFragments(false) {
	CHECK(mDrmManagerClient);
	mDrmManagerClient->initializeDecryptUnit(
	mDecryptHandle, trackId, ipmpBox);

	const char *mime;
	bool success = getFormat()->findCString(kKeyMIMEType, &mime);
	CHECK(success);

	if (!strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC)) {
	uint32_t type;
	const void *data;
	size_t size;
	CHECK(getFormat()->findData(kKeyAVCC, &type, &data, &size));

	const uint8_t ptr = (const uint8_t )data;

	CHECK(size >= 7);
	CHECK_EQ(ptr[0], 1); // configurationVersion == 1

	// The number of bytes used to encode the length of a NAL unit.
	mNALLengthSize = 1 + (ptr[4] & 3);
	}
	}

	DRMSource::~DRMSource() {
	Mutex::Autolock autoLock(mDRMLock);
	mDrmManagerClient->finalizeDecryptUnit(mDecryptHandle, mTrackId);
	}

	status_t DRMSource::start(MetaData *params) {
	int32_t val;
	if (params && params->findInt32(kKeyWantsNALFragments, &val)
	&& val != 0) {
	mWantsNALFragments = true;
	} else {
	mWantsNALFragments = false;
	}

	return mOriginalMediaSource->start(params);
	}

	status_t DRMSource::stop() {
	return mOriginalMediaSource->stop();
	}

	sp<MetaData> DRMSource::getFormat() {
	return mOriginalMediaSource->getFormat();
	}

	status_t DRMSource::read(MediaBuffer *buffer, const ReadOptions options) {
	Mutex::Autolock autoLock(mDRMLock);
	status_t err;
	if ((err = mOriginalMediaSource->read(buffer, options)) != OK) {
	return err;
	}

	size_t len = (*buffer)->range_length();

	char src = (char )(buffer)->data() + (buffer)->range_offset();

	DrmBuffer encryptedDrmBuffer(src, len);
	DrmBuffer decryptedDrmBuffer;
	decryptedDrmBuffer.length = len;
	decryptedDrmBuffer.data = new char[len];
	DrmBuffer *pDecryptedDrmBuffer = &decryptedDrmBuffer;

	if ((err = mDrmManagerClient->decrypt(mDecryptHandle, mTrackId,
	&encryptedDrmBuffer, &pDecryptedDrmBuffer)) != NO_ERROR) {

	if (decryptedDrmBuffer.data) {
	delete [] decryptedDrmBuffer.data;
	decryptedDrmBuffer.data = NULL;
	}

	return err;
	}
	CHECK(pDecryptedDrmBuffer == &decryptedDrmBuffer);

	const char *mime;
	CHECK(getFormat()->findCString(kKeyMIMEType, &mime));

	if (!strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC) && !mWantsNALFragments) {
	uint8_t dstData = (uint8_t)src;
	size_t srcOffset = 0;
	size_t dstOffset = 0;

	len = decryptedDrmBuffer.length;
	while (srcOffset < len) {
	CHECK(srcOffset + mNALLengthSize <= len);
	size_t nalLength = 0;
	const uint8_t* data = (const uint8_t*)(&decryptedDrmBuffer.data[srcOffset]);

	switch (mNALLengthSize) {
	case 1:
	nalLength = *data;
	break;
	case 2:
	nalLength = U16_AT(data);
	break;
	case 3:
	nalLength = ((size_t)data[0] << 16) \| U16_AT(&data[1]);
	break;
	case 4:
	nalLength = U32_AT(data);
	break;
	default:
	CHECK(!"Should not be here.");
	break;
	}

	srcOffset += mNALLengthSize;

	if (srcOffset + nalLength > len) {
	if (decryptedDrmBuffer.data) {
	delete [] decryptedDrmBuffer.data;
	decryptedDrmBuffer.data = NULL;
	}

	return ERROR_MALFORMED;
	}

	if (nalLength == 0) {
	continue;
	}

	CHECK(dstOffset + 4 <= (*buffer)->size());

	dstData[dstOffset++] = 0;
	dstData[dstOffset++] = 0;
	dstData[dstOffset++] = 0;
	dstData[dstOffset++] = 1;
	memcpy(&dstData[dstOffset], &decryptedDrmBuffer.data[srcOffset], nalLength);
	srcOffset += nalLength;
	dstOffset += nalLength;
	}

	CHECK_EQ(srcOffset, len);
	(buffer)->set_range((buffer)->range_offset(), dstOffset);

	} else {
	memcpy(src, decryptedDrmBuffer.data, decryptedDrmBuffer.length);
	(buffer)->set_range((buffer)->range_offset(), decryptedDrmBuffer.length);
	}

	if (decryptedDrmBuffer.data) {
	delete [] decryptedDrmBuffer.data;
	decryptedDrmBuffer.data = NULL;
	}

	return OK;
	}

	////////////////////////////////////////////////////////////////////////////////

	DRMExtractor::DRMExtractor(const sp<DataSource> &source, const char* mime)
	: mDataSource(source),
	mDecryptHandle(NULL),
	mDrmManagerClient(NULL) {
	mOriginalExtractor = MediaExtractor::Create(source, mime);
	mOriginalExtractor->setDrmFlag(true);
	mOriginalExtractor->getMetaData()->setInt32(kKeyIsDRM, 1);

	source->getDrmInfo(mDecryptHandle, &mDrmManagerClient);
	}

	DRMExtractor::~DRMExtractor() {
	}

	size_t DRMExtractor::countTracks() {
	return mOriginalExtractor->countTracks();
	}

	sp<MediaSource> DRMExtractor::getTrack(size_t index) {
	sp<MediaSource> originalMediaSource = mOriginalExtractor->getTrack(index);
	originalMediaSource->getFormat()->setInt32(kKeyIsDRM, 1);

	int32_t trackID;
	CHECK(getTrackMetaData(index, 0)->findInt32(kKeyTrackID, &trackID));

	DrmBuffer ipmpBox;
	ipmpBox.data = mOriginalExtractor->getDrmTrackInfo(trackID, &(ipmpBox.length));
	CHECK(ipmpBox.length > 0);

	return new DRMSource(originalMediaSource, mDecryptHandle, mDrmManagerClient,
	trackID, &ipmpBox);
	}

	sp<MetaData> DRMExtractor::getTrackMetaData(size_t index, uint32_t flags) {
	return mOriginalExtractor->getTrackMetaData(index, flags);
	}

	sp<MetaData> DRMExtractor::getMetaData() {
	return mOriginalExtractor->getMetaData();
	}

	bool SniffDRM(
	const sp<DataSource> &source, String8 mimeType, float confidence,
	sp<AMessage> *) {
	sp<DecryptHandle> decryptHandle = source->DrmInitialization();

	if (decryptHandle != NULL) {
	if (decryptHandle->decryptApiType == DecryptApiType::CONTAINER_BASED) {
	*mimeType = String8("drm+container_based+") + decryptHandle->mimeType;
	*confidence = 10.0f;
	} else if (decryptHandle->decryptApiType == DecryptApiType::ELEMENTARY_STREAM_BASED) {
	*mimeType = String8("drm+es_based+") + decryptHandle->mimeType;
	*confidence = 10.0f;
	} else {
	return false;
	}

	return true;
	}

	return false;
	}
	} //namespace android