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/*
* Copyright (c) 2009-2011 Intel Corporation. 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.
*/
#ifndef VIDEO_DECODER_AVC_SECURE_H_
#define VIDEO_DECODER_AVC_SECURE_H_
#include "VideoDecoderAVC.h"
class VideoDecoderAVCSecure : public VideoDecoderAVC {
public:
VideoDecoderAVCSecure(const char *mimeType);
virtual ~VideoDecoderAVCSecure();
virtual Decode_Status start(VideoConfigBuffer *buffer);
virtual void stop(void);
// data in the decoded buffer is all encrypted.
virtual Decode_Status decode(VideoDecodeBuffer *buffer);
private:
enum {
MAX_SLICE_HEADER_SIZE = 30,
MAX_NALU_HEADER_BUFFER = 8192,
MAX_NALU_NUMBER = 400, // > 4096/12
};
// Information of Network Abstraction Layer Unit
struct NaluInfo {
int32_t naluOffset; // offset of NAL unit in the firewalled buffer
int32_t naluLen; // length of NAL unit
int32_t naluHeaderLen; // length of NAL unit header
};
struct NaluMetadata {
NaluInfo *naluInfo;
int32_t naluNumber; // number of NAL units
};
struct NaluByteStream {
int32_t naluOffset;
int32_t naluLen;
int32_t streamPos;
uint8_t *byteStream; // 4 bytes of naluCount, 4 bytes of naluOffset, 4 bytes of naulLen, 4 bytes of naluHeaderLen, followed by naluHeaderData
int32_t naluCount;
};
virtual Decode_Status decodeSlice(vbp_data_h264 *data, uint32_t picIndex, uint32_t sliceIndex);
int32_t findNalUnitOffset(uint8_t *stream, int32_t offset, int32_t length);
Decode_Status copyNaluHeader(uint8_t *stream, NaluByteStream *naluStream);
Decode_Status parseAnnexBStream(uint8_t *stream, int32_t length, NaluByteStream *naluStream);
private:
NaluMetadata mMetadata;
NaluByteStream mByteStream;
uint8_t *mNaluHeaderBuffer;
uint8_t *mInputBuffer;
};
#endif /* VIDEO_DECODER_AVC_SECURE_H_ */
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