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Side by Side Diff: media/video/h264_poc.h

Issue 2661423002: VTVDA: Optimize pic_order_cnt_type == 2. (Closed)
Patch Set: Update unit test. Created 3 years, 9 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved. 1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef MEDIA_VIDEO_H264_POC_H_ 5 #ifndef MEDIA_VIDEO_H264_POC_H_
6 #define MEDIA_VIDEO_H264_POC_H_ 6 #define MEDIA_VIDEO_H264_POC_H_
7 7
8 #include <stdint.h> 8 #include <stdint.h>
9 9
10 #include "base/macros.h" 10 #include "base/macros.h"
11 11
12 namespace media { 12 namespace media {
13 13
14 struct H264SPS; 14 struct H264SPS;
15 struct H264SliceHeader; 15 struct H264SliceHeader;
16 16
17 class MEDIA_EXPORT H264POC { 17 class MEDIA_EXPORT H264POC {
18 public: 18 public:
19 H264POC(); 19 H264POC();
20 ~H264POC(); 20 ~H264POC();
21 21
22 // Compute the picture order count for a slice, storing the result into 22 // Compute the picture order count for a slice, storing the result into
23 // |*pic_order_cnt|. 23 // |*pic_order_cnt|.
24 // TODO(sandersd): Switch to a base::Optional<int32_t> return type.
24 bool ComputePicOrderCnt( 25 bool ComputePicOrderCnt(
25 const H264SPS* sps, 26 const H264SPS* sps,
26 const H264SliceHeader& slice_hdr, 27 const H264SliceHeader& slice_hdr,
27 int32_t* pic_order_cnt); 28 int32_t* pic_order_cnt);
28 29
30 // As specified, the POC of a frame with MMCO5 changes (to zero) after
31 // decoding. We instead return 0 immediately, and flag that this has occurred
32 // by returning true here until ComputePicOrderCnt() is called again.
33 //
34 // Frames with MMCO5 do not reorder relative to frames earlier in decode
35 // order, but may reorder relative to frames later in decode order (just like
36 // IDRs).
37 bool IsPendingMMCO5() { return pending_mmco5_; }
38
29 // Reset computation state. It's best (although not strictly required) to call 39 // Reset computation state. It's best (although not strictly required) to call
30 // this after a seek. 40 // this after a seek.
31 void Reset(); 41 void Reset();
32 42
33 private: 43 private:
34 int32_t ref_pic_order_cnt_msb_; 44 int32_t ref_pic_order_cnt_msb_;
35 int32_t ref_pic_order_cnt_lsb_; 45 int32_t ref_pic_order_cnt_lsb_;
36 int32_t prev_frame_num_; 46 int32_t prev_frame_num_;
37 int32_t prev_frame_num_offset_; 47 int32_t prev_frame_num_offset_;
48 bool pending_mmco5_;
38 49
39 DISALLOW_COPY_AND_ASSIGN(H264POC); 50 DISALLOW_COPY_AND_ASSIGN(H264POC);
40 }; 51 };
41 52
42 } // namespace media 53 } // namespace media
43 54
44 #endif // MEDIA_VIDEO_H264_POC_H_ 55 #endif // MEDIA_VIDEO_H264_POC_H_
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