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
98
99
100
101
102
|
// Copyright (c) 2012 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_FILTERS_FFMPEG_VIDEO_DECODER_H_
#define MEDIA_FILTERS_FFMPEG_VIDEO_DECODER_H_
#include <list>
#include <memory>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/sequence_checker.h"
#include "media/base/video_decoder.h"
#include "media/base/video_decoder_config.h"
#include "media/base/video_frame_pool.h"
#include "media/ffmpeg/ffmpeg_deleters.h"
struct AVCodecContext;
struct AVFrame;
namespace media {
class DecoderBuffer;
class FFmpegDecodingLoop;
class MediaLog;
class MEDIA_EXPORT FFmpegVideoDecoder : public VideoDecoder {
public:
static bool IsCodecSupported(VideoCodec codec);
explicit FFmpegVideoDecoder(MediaLog* media_log);
~FFmpegVideoDecoder() override;
// Allow decoding of individual NALU. Entire frames are required by default.
// Disables low-latency mode. Must be called before Initialize().
void set_decode_nalus(bool decode_nalus) { decode_nalus_ = decode_nalus; }
// VideoDecoder implementation.
std::string GetDisplayName() const override;
void Initialize(const VideoDecoderConfig& config,
bool low_delay,
CdmContext* cdm_context,
InitCB init_cb,
const OutputCB& output_cb,
const WaitingCB& waiting_cb) override;
void Decode(scoped_refptr<DecoderBuffer> buffer, DecodeCB decode_cb) override;
void Reset(base::OnceClosure closure) override;
// Callback called from within FFmpeg to allocate a buffer based on
// the dimensions of |codec_context|. See AVCodecContext.get_buffer2
// documentation inside FFmpeg.
int GetVideoBuffer(struct AVCodecContext* codec_context,
AVFrame* frame,
int flags);
private:
enum DecoderState {
kUninitialized,
kNormal,
kDecodeFinished,
kError
};
// Handles decoding of an unencrypted encoded buffer. A return value of false
// indicates that an error has occurred.
bool FFmpegDecode(const DecoderBuffer& buffer);
bool OnNewFrame(AVFrame* frame);
// Handles (re-)initializing the decoder with a (new) config.
// Returns true if initialization was successful.
bool ConfigureDecoder(const VideoDecoderConfig& config, bool low_delay);
// Releases resources associated with |codec_context_|.
void ReleaseFFmpegResources();
SEQUENCE_CHECKER(sequence_checker_);
MediaLog* media_log_;
DecoderState state_;
OutputCB output_cb_;
// FFmpeg structures owned by this object.
std::unique_ptr<AVCodecContext, ScopedPtrAVFreeContext> codec_context_;
VideoDecoderConfig config_;
VideoFramePool frame_pool_;
bool decode_nalus_;
std::unique_ptr<FFmpegDecodingLoop> decoding_loop_;
DISALLOW_COPY_AND_ASSIGN(FFmpegVideoDecoder);
};
} // namespace media
#endif // MEDIA_FILTERS_FFMPEG_VIDEO_DECODER_H_
|
