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| 1 /* |
| 2 * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ |
| 10 |
| 11 #ifndef WEBRTC_MODULES_VIDEO_CODING_UTILITY_H264_BITSTREAM_PARSER_H_ |
| 12 #define WEBRTC_MODULES_VIDEO_CODING_UTILITY_H264_BITSTREAM_PARSER_H_ |
| 13 #include <stddef.h> |
| 14 #include <stdint.h> |
| 15 |
| 16 #include "webrtc/base/optional.h" |
| 17 #include "webrtc/common_video/h264/pps_parser.h" |
| 18 #include "webrtc/common_video/h264/sps_parser.h" |
| 19 |
| 20 namespace rtc { |
| 21 class BitBufferWriter; |
| 22 } |
| 23 |
| 24 namespace webrtc { |
| 25 |
| 26 // Stateful H264 bitstream parser (due to SPS/PPS). Used to parse out QP values |
| 27 // from the bitstream. |
| 28 // TODO(pbos): Unify with RTP SPS parsing and only use one H264 parser. |
| 29 // TODO(pbos): If/when this gets used on the receiver side CHECKs must be |
| 30 // removed and gracefully abort as we have no control over receive-side |
| 31 // bitstreams. |
| 32 class H264BitstreamParser { |
| 33 public: |
| 34 H264BitstreamParser(); |
| 35 virtual ~H264BitstreamParser(); |
| 36 |
| 37 // Parse an additional chunk of H264 bitstream. |
| 38 void ParseBitstream(const uint8_t* bitstream, size_t length); |
| 39 |
| 40 // Get the last extracted QP value from the parsed bitstream. |
| 41 bool GetLastSliceQp(int* qp) const; |
| 42 |
| 43 protected: |
| 44 void ParseSlice(const uint8_t* slice, size_t length); |
| 45 bool ParseNonParameterSetNalu(const uint8_t* source, |
| 46 size_t source_length, |
| 47 uint8_t nalu_type); |
| 48 |
| 49 // SPS/PPS state, updated when parsing new SPS/PPS, used to parse slices. |
| 50 rtc::Optional<SpsParser::SpsState> sps_; |
| 51 rtc::Optional<PpsParser::PpsState> pps_; |
| 52 |
| 53 // Last parsed slice QP. |
| 54 rtc::Optional<int32_t> last_slice_qp_delta_; |
| 55 }; |
| 56 |
| 57 } // namespace webrtc |
| 58 |
| 59 #endif // WEBRTC_MODULES_VIDEO_CODING_UTILITY_H264_BITSTREAM_PARSER_H_ |
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