c20978e581
NOPRESUBMIT=True # cpplint errors that aren't caused by this CL. NOTRY=True NOTREECHECKS=True TBR=kwiberg@webrtc.org, kjellander@webrtc.org Bug: webrtc:7634 Change-Id: I3cca0fbaa807b563c95979cccd6d1bec32055f36 Reviewed-on: https://chromium-review.googlesource.com/562156 Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#18919}
54 lines
1.7 KiB
C++
54 lines
1.7 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_SPS_PARSER_H_
|
|
#define WEBRTC_COMMON_VIDEO_H264_SPS_PARSER_H_
|
|
|
|
#include "webrtc/rtc_base/optional.h"
|
|
|
|
namespace rtc {
|
|
class BitBuffer;
|
|
}
|
|
|
|
namespace webrtc {
|
|
|
|
// A class for parsing out sequence parameter set (SPS) data from an H264 NALU.
|
|
class SpsParser {
|
|
public:
|
|
// The parsed state of the SPS. Only some select values are stored.
|
|
// Add more as they are actually needed.
|
|
struct SpsState {
|
|
SpsState() = default;
|
|
|
|
uint32_t width = 0;
|
|
uint32_t height = 0;
|
|
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;
|
|
uint32_t max_num_ref_frames = 0;
|
|
uint32_t vui_params_present = 0;
|
|
uint32_t id = 0;
|
|
};
|
|
|
|
// Unpack RBSP and parse SPS state from the supplied buffer.
|
|
static rtc::Optional<SpsState> ParseSps(const uint8_t* data, size_t length);
|
|
|
|
protected:
|
|
// Parse the SPS state, up till the VUI part, for a bit buffer where RBSP
|
|
// decoding has already been performed.
|
|
static rtc::Optional<SpsState> ParseSpsUpToVui(rtc::BitBuffer* buffer);
|
|
};
|
|
|
|
} // namespace webrtc
|
|
#endif // WEBRTC_COMMON_VIDEO_H264_SPS_PARSER_H_
|