50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2016 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_COMMON_VIDEO_H264_PPS_PARSER_H_
|
||
|
|
#define WEBRTC_COMMON_VIDEO_H264_PPS_PARSER_H_
|
||
|
|
|
||
|
|
#include "webrtc/base/common.h"
|
||
|
|
#include "webrtc/base/optional.h"
|
||
|
|
|
||
|
|
namespace rtc {
|
||
|
|
class BitBuffer;
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace webrtc {
|
||
|
|
|
||
|
|
// A class for parsing out picture parameter set (PPS) data from a H264 NALU.
|
||
|
|
class PpsParser {
|
||
|
|
public:
|
||
|
|
// The parsed state of the PPS. Only some select values are stored.
|
||
|
|
// Add more as they are actually needed.
|
||
|
|
struct PpsState {
|
||
|
|
PpsState() = default;
|
||
|
|
|
||
|
|
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;
|
||
|
|
};
|
||
|
|
|
||
|
|
// Unpack RBSP and parse PPS state from the supplied buffer.
|
||
|
|
static rtc::Optional<PpsState> ParsePps(const uint8_t* data, size_t length);
|
||
|
|
|
||
|
|
protected:
|
||
|
|
// Parse the PPS state, for a bit buffer where RBSP decoding has already been
|
||
|
|
// performed.
|
||
|
|
static rtc::Optional<PpsState> ParseInternal(rtc::BitBuffer* bit_buffer);
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace webrtc
|
||
|
|
|
||
|
|
#endif // WEBRTC_COMMON_VIDEO_H264_PPS_PARSER_H_
|