Move H264BitstreamParser to video_coding.

webrtc/modules/rtp_rtcp/source/h264_bitstream_parser.h

-/*
- *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_H264_BITSTREAM_PARSER_H_
-#define WEBRTC_MODULES_RTP_RTCP_SOURCE_H264_BITSTREAM_PARSER_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-namespace rtc {
-class BitBuffer;
-}
-
-namespace webrtc {
-
-// Stateful H264 bitstream parser (due to SPS/PPS). Used to parse out QP values
-// from the bitstream.
-// TODO(pbos): Unify with RTP SPS parsing and only use one H264 parser.
-// TODO(pbos): If/when this gets used on the receiver side CHECKs must be
-// removed and gracefully abort as we have no control over receive-side
-// bitstreams.
-class H264BitstreamParser {
- public:
-  // Parse an additional chunk of H264 bitstream.
-  void ParseBitstream(const uint8_t* bitstream, size_t length);
-
-  // Get the last extracted QP value from the parsed bitstream.
-  bool GetLastSliceQp(int* qp) const;
-
- private:
-  // Captured in SPS and used when parsing slice NALUs.
-  struct SpsState {
-    SpsState();
-
-    uint32_t delta_pic_order_always_zero_flag = 0;
-    uint32_t separate_colour_plane_flag = 0;
-    uint32_t frame_mbs_only_flag = 0;
-    uint32_t log2_max_frame_num_minus4 = 0;
-    uint32_t log2_max_pic_order_cnt_lsb_minus4 = 0;
-    uint32_t pic_order_cnt_type = 0;
-  };
-
-  struct PpsState {
-    PpsState();
-
-    bool bottom_field_pic_order_in_frame_present_flag = false;
-    bool weighted_pred_flag = false;
-    uint32_t weighted_bipred_idc = false;
-    uint32_t redundant_pic_cnt_present_flag = 0;
-    int pic_init_qp_minus26 = 0;
-  };
-
-  void ParseSlice(const uint8_t* slice, size_t length);
-  bool ParseSpsNalu(const uint8_t* sps_nalu, size_t length);
-  bool ParsePpsNalu(const uint8_t* pps_nalu, size_t length);
-  bool ParseNonParameterSetNalu(const uint8_t* source,
-                                size_t source_length,
-                                uint8_t nalu_type);
-
-  // SPS/PPS state, updated when parsing new SPS/PPS, used to parse slices.
-  bool sps_parsed_ = false;
-  SpsState sps_;
-  bool pps_parsed_ = false;
-  PpsState pps_;
-
-  // Last parsed slice QP.
-  bool last_slice_qp_delta_parsed_ = false;
-  int32_t last_slice_qp_delta_ = 0;
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_H264_BITSTREAM_PARSER_H_