blob: 5cb247e89617ff90e9b2e0a702bb7c03f63f1cbd (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_MP2T_ES_PARSER_H264_H_
#define MEDIA_MP2T_ES_PARSER_H264_H_
#include <list>
#include <utility>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/time/time.h"
#include "media/base/byte_queue.h"
#include "media/base/video_decoder_config.h"
#include "media/mp2t/es_parser.h"
namespace media {
class BitReader;
class StreamParserBuffer;
}
namespace media {
namespace mp2t {
// Remark:
// In this h264 parser, frame splitting is based on AUD nals.
// Mpeg2 TS spec: "2.14 Carriage of Rec. ITU-T H.264 | ISO/IEC 14496-10 video"
// "Each AVC access unit shall contain an access unit delimiter NAL Unit;"
//
class EsParserH264 : public EsParser {
public:
typedef base::Callback<void(const VideoDecoderConfig&)> NewVideoConfigCB;
EsParserH264(const NewVideoConfigCB& new_video_config_cb,
const EmitBufferCB& emit_buffer_cb);
virtual ~EsParserH264();
// EsParser implementation.
virtual bool Parse(const uint8* buf, int size,
base::TimeDelta pts,
base::TimeDelta dts) OVERRIDE;
virtual void Flush() OVERRIDE;
virtual void Reset() OVERRIDE;
private:
struct TimingDesc {
base::TimeDelta dts;
base::TimeDelta pts;
};
// H264 parser.
// It resumes parsing from byte position |es_pos_|.
bool ParseInternal();
// Emit a frame if a frame has been started earlier.
void EmitFrameIfNeeded(int next_aud_pos);
// Start a new frame.
// Note: if aud_pos < 0, clear the current frame.
void StartFrame(int aud_pos);
// Discard |nbytes| of ES from the ES byte queue.
void DiscardEs(int nbytes);
// Parse a NAL / SPS.
// Returns true if successful (compliant bitstream).
bool NalParser(const uint8* buf, int size);
bool ProcessSPS(const uint8* buf, int size);
// Callbacks to pass the stream configuration and the frames.
NewVideoConfigCB new_video_config_cb_;
EmitBufferCB emit_buffer_cb_;
// Bytes of the ES stream that have not been emitted yet.
ByteQueue es_byte_queue_;
std::list<std::pair<int, TimingDesc> > timing_desc_list_;
// H264 parser state.
// Note: |current_access_unit_pos_| is pointing to an annexB syncword
// while |current_nal_pos_| is pointing to the NAL unit
// (i.e. does not include the annexB syncword).
int es_pos_;
int current_nal_pos_;
int current_access_unit_pos_;
bool is_key_frame_;
// Last video decoder config.
VideoDecoderConfig last_video_decoder_config_;
};
} // namespace mp2t
} // namespace media
#endif
|
