blob: 145700f509b4c0b65113ea668f02de33f46af063 [file] [log] [blame]
* 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.
#include <stddef.h>
#include <stdint.h>
#include "webrtc/api/optional.h"
#include "webrtc/common_video/h264/pps_parser.h"
#include "webrtc/common_video/h264/sps_parser.h"
namespace rtc {
class BitBufferWriter;
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 {
enum Result {
virtual ~H264BitstreamParser();
// 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;
void ParseSlice(const uint8_t* slice, size_t length);
Result 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.
rtc::Optional<SpsParser::SpsState> sps_;
rtc::Optional<PpsParser::PpsState> pps_;
// Last parsed slice QP.
rtc::Optional<int32_t> last_slice_qp_delta_;
} // namespace webrtc