b8b6fbb7a5
BUG=webrtc:5277 R=mflodman Review URL: https://codereview.webrtc.org/1505993003 Cr-Commit-Position: refs/heads/master@{#10971}
81 lines
2.5 KiB
C++
81 lines
2.5 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_MODULES_RTP_RTCP_SOURCE_H264_BITSTREAM_PARSER_H_
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#define WEBRTC_MODULES_RTP_RTCP_SOURCE_H264_BITSTREAM_PARSER_H_
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#include <stddef.h>
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#include <stdint.h>
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namespace rtc {
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class BitBuffer;
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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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// 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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private:
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// Captured in SPS and used when parsing slice NALUs.
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struct SpsState {
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SpsState();
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uint32_t delta_pic_order_always_zero_flag = 0;
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uint32_t separate_colour_plane_flag = 0;
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uint32_t frame_mbs_only_flag = 0;
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uint32_t log2_max_frame_num_minus4 = 0;
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uint32_t log2_max_pic_order_cnt_lsb_minus4 = 0;
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uint32_t pic_order_cnt_type = 0;
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};
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struct PpsState {
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PpsState();
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bool bottom_field_pic_order_in_frame_present_flag = false;
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bool weighted_pred_flag = false;
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uint32_t weighted_bipred_idc = false;
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uint32_t redundant_pic_cnt_present_flag = 0;
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int pic_init_qp_minus26 = 0;
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};
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void ParseSlice(const uint8_t* slice, size_t length);
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bool ParseSpsNalu(const uint8_t* sps_nalu, size_t length);
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bool ParsePpsNalu(const uint8_t* pps_nalu, size_t length);
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bool 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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bool sps_parsed_ = false;
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SpsState sps_;
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bool pps_parsed_ = false;
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PpsState pps_;
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// Last parsed slice QP.
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bool last_slice_qp_delta_parsed_ = false;
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int32_t last_slice_qp_delta_ = 0;
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_H264_BITSTREAM_PARSER_H_
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