f752bca4a5
This CL allows the H264 bitstream parser to abort and report an error on invalid input rather than crashing, and it fixes several crashes found when fuzzing. BUG=webrtc:6454 R=magjed@webrtc.org,pbos@webrtc.org Review-Url: https://codereview.webrtc.org/2471973003 Cr-Commit-Position: refs/heads/master@{#14929}
66 lines
2.0 KiB
C++
66 lines
2.0 KiB
C++
/*
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* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_COMMON_VIDEO_H264_H264_BITSTREAM_PARSER_H_
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#define WEBRTC_COMMON_VIDEO_H264_H264_BITSTREAM_PARSER_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "webrtc/base/optional.h"
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#include "webrtc/common_video/h264/pps_parser.h"
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#include "webrtc/common_video/h264/sps_parser.h"
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namespace rtc {
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class BitBufferWriter;
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}
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namespace webrtc {
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// Stateful H264 bitstream parser (due to SPS/PPS). Used to parse out QP values
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// from the bitstream.
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// TODO(pbos): Unify with RTP SPS parsing and only use one H264 parser.
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// TODO(pbos): If/when this gets used on the receiver side CHECKs must be
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// removed and gracefully abort as we have no control over receive-side
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// bitstreams.
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class H264BitstreamParser {
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public:
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enum Result {
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kOk,
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kInvalidStream,
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kUnsupportedStream,
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};
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H264BitstreamParser();
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virtual ~H264BitstreamParser();
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// Parse an additional chunk of H264 bitstream.
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void ParseBitstream(const uint8_t* bitstream, size_t length);
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// Get the last extracted QP value from the parsed bitstream.
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bool GetLastSliceQp(int* qp) const;
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protected:
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void ParseSlice(const uint8_t* slice, size_t length);
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Result ParseNonParameterSetNalu(const uint8_t* source,
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size_t source_length,
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uint8_t nalu_type);
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// SPS/PPS state, updated when parsing new SPS/PPS, used to parse slices.
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rtc::Optional<SpsParser::SpsState> sps_;
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rtc::Optional<PpsParser::PpsState> pps_;
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// Last parsed slice QP.
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rtc::Optional<int32_t> last_slice_qp_delta_;
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};
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} // namespace webrtc
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#endif // WEBRTC_COMMON_VIDEO_H264_H264_BITSTREAM_PARSER_H_
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