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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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_BASE_AUDIO_DECODER_CONFIG_H_ | 5 #ifndef MEDIA_BASE_AUDIO_DECODER_CONFIG_H_ |
6 #define MEDIA_BASE_AUDIO_DECODER_CONFIG_H_ | 6 #define MEDIA_BASE_AUDIO_DECODER_CONFIG_H_ |
7 | 7 |
8 #include <stdint.h> | 8 #include <stdint.h> |
9 | 9 |
10 #include <string> | 10 #include <string> |
11 #include <vector> | 11 #include <vector> |
12 | 12 |
13 #include "base/macros.h" | 13 #include "base/macros.h" |
14 #include "base/time/time.h" | 14 #include "base/time/time.h" |
15 #include "media/base/audio_codecs.h" | 15 #include "media/base/audio_codecs.h" |
16 #include "media/base/channel_layout.h" | 16 #include "media/base/channel_layout.h" |
17 #include "media/base/encryption_scheme.h" | |
18 #include "media/base/media_export.h" | 17 #include "media/base/media_export.h" |
19 #include "media/base/sample_format.h" | 18 #include "media/base/sample_format.h" |
20 | 19 |
21 namespace media { | 20 namespace media { |
22 | 21 |
23 // TODO(dalecurtis): FFmpeg API uses |bytes_per_channel| instead of | 22 // TODO(dalecurtis): FFmpeg API uses |bytes_per_channel| instead of |
24 // |bits_per_channel|, we should switch over since bits are generally confusing | 23 // |bits_per_channel|, we should switch over since bits are generally confusing |
25 // to work with. | 24 // to work with. |
26 class MEDIA_EXPORT AudioDecoderConfig { | 25 class MEDIA_EXPORT AudioDecoderConfig { |
27 public: | 26 public: |
28 // Constructs an uninitialized object. Clients should call Initialize() with | 27 // Constructs an uninitialized object. Clients should call Initialize() with |
29 // appropriate values before using. | 28 // appropriate values before using. |
30 AudioDecoderConfig(); | 29 AudioDecoderConfig(); |
31 | 30 |
32 // Constructs an initialized object. | 31 // Constructs an initialized object. |
33 AudioDecoderConfig(AudioCodec codec, | 32 AudioDecoderConfig(AudioCodec codec, |
34 SampleFormat sample_format, | 33 SampleFormat sample_format, |
35 ChannelLayout channel_layout, | 34 ChannelLayout channel_layout, |
36 int samples_per_second, | 35 int samples_per_second, |
37 const std::vector<uint8_t>& extra_data, | 36 const std::vector<uint8_t>& extra_data, |
38 const EncryptionScheme& encryption_scheme); | 37 bool is_encrypted); |
39 | 38 |
40 AudioDecoderConfig(const AudioDecoderConfig& other); | 39 AudioDecoderConfig(const AudioDecoderConfig& other); |
41 | 40 |
42 ~AudioDecoderConfig(); | 41 ~AudioDecoderConfig(); |
43 | 42 |
44 // Resets the internal state of this object. |codec_delay| is in frames. | 43 // Resets the internal state of this object. |codec_delay| is in frames. |
45 void Initialize(AudioCodec codec, | 44 void Initialize(AudioCodec codec, |
46 SampleFormat sample_format, | 45 SampleFormat sample_format, |
47 ChannelLayout channel_layout, | 46 ChannelLayout channel_layout, |
48 int samples_per_second, | 47 int samples_per_second, |
49 const std::vector<uint8_t>& extra_data, | 48 const std::vector<uint8_t>& extra_data, |
50 const EncryptionScheme& encryption_scheme, | 49 bool is_encrypted, |
51 base::TimeDelta seek_preroll, | 50 base::TimeDelta seek_preroll, |
52 int codec_delay); | 51 int codec_delay); |
53 | 52 |
54 // Returns true if this object has appropriate configuration values, false | 53 // Returns true if this object has appropriate configuration values, false |
55 // otherwise. | 54 // otherwise. |
56 bool IsValidConfig() const; | 55 bool IsValidConfig() const; |
57 | 56 |
58 // Returns true if all fields in |config| match this config. | 57 // Returns true if all fields in |config| match this config. |
59 // Note: The contents of |extra_data_| are compared not the raw pointers. | 58 // Note: The contents of |extra_data_| are compared not the raw pointers. |
60 bool Matches(const AudioDecoderConfig& config) const; | 59 bool Matches(const AudioDecoderConfig& config) const; |
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73 base::TimeDelta seek_preroll() const { return seek_preroll_; } | 72 base::TimeDelta seek_preroll() const { return seek_preroll_; } |
74 int codec_delay() const { return codec_delay_; } | 73 int codec_delay() const { return codec_delay_; } |
75 | 74 |
76 // Optional byte data required to initialize audio decoders such as Vorbis | 75 // Optional byte data required to initialize audio decoders such as Vorbis |
77 // codebooks. | 76 // codebooks. |
78 const std::vector<uint8_t>& extra_data() const { return extra_data_; } | 77 const std::vector<uint8_t>& extra_data() const { return extra_data_; } |
79 | 78 |
80 // Whether the audio stream is potentially encrypted. | 79 // Whether the audio stream is potentially encrypted. |
81 // Note that in a potentially encrypted audio stream, individual buffers | 80 // Note that in a potentially encrypted audio stream, individual buffers |
82 // can be encrypted or not encrypted. | 81 // can be encrypted or not encrypted. |
83 bool is_encrypted() const { return encryption_scheme_.is_encrypted(); } | 82 bool is_encrypted() const { return is_encrypted_; } |
84 | |
85 // Encryption scheme used for encrypted buffers. | |
86 const EncryptionScheme& encryption_scheme() const { | |
87 return encryption_scheme_; | |
88 } | |
89 | 83 |
90 private: | 84 private: |
91 AudioCodec codec_; | 85 AudioCodec codec_; |
92 SampleFormat sample_format_; | 86 SampleFormat sample_format_; |
93 int bytes_per_channel_; | 87 int bytes_per_channel_; |
94 ChannelLayout channel_layout_; | 88 ChannelLayout channel_layout_; |
95 int samples_per_second_; | 89 int samples_per_second_; |
96 int bytes_per_frame_; | 90 int bytes_per_frame_; |
97 std::vector<uint8_t> extra_data_; | 91 std::vector<uint8_t> extra_data_; |
98 EncryptionScheme encryption_scheme_; | 92 bool is_encrypted_; |
99 | 93 |
100 // |seek_preroll_| is the duration of the data that the decoder must decode | 94 // |seek_preroll_| is the duration of the data that the decoder must decode |
101 // before the decoded data is valid. | 95 // before the decoded data is valid. |
102 base::TimeDelta seek_preroll_; | 96 base::TimeDelta seek_preroll_; |
103 | 97 |
104 // |codec_delay_| is the number of frames the decoder should discard before | 98 // |codec_delay_| is the number of frames the decoder should discard before |
105 // returning decoded data. This value can include both decoder delay as well | 99 // returning decoded data. This value can include both decoder delay as well |
106 // as padding added during encoding. | 100 // as padding added during encoding. |
107 int codec_delay_; | 101 int codec_delay_; |
108 | 102 |
109 // Not using DISALLOW_COPY_AND_ASSIGN here intentionally to allow the compiler | 103 // Not using DISALLOW_COPY_AND_ASSIGN here intentionally to allow the compiler |
110 // generated copy constructor and assignment operator. Since the extra data is | 104 // generated copy constructor and assignment operator. Since the extra data is |
111 // typically small, the performance impact is minimal. | 105 // typically small, the performance impact is minimal. |
112 }; | 106 }; |
113 | 107 |
114 } // namespace media | 108 } // namespace media |
115 | 109 |
116 #endif // MEDIA_BASE_AUDIO_DECODER_CONFIG_H_ | 110 #endif // MEDIA_BASE_AUDIO_DECODER_CONFIG_H_ |
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