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
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_DECODER_CLIENT_HXX
#define MPD_DECODER_CLIENT_HXX
#include "check.h"
#include "DecoderCommand.hxx"
#include "Chrono.hxx"
#include "input/Ptr.hxx"
#include "Compiler.h"
#include <stdint.h>
struct AudioFormat;
struct Tag;
struct ReplayGainInfo;
class MixRampInfo;
/**
* An interface between the decoder plugin and the MPD core.
*/
class DecoderClient {
public:
/**
* Notify the client that it has finished initialization and
* that it has read the song's meta data.
*
* @param audio_format the audio format which is going to be
* sent to SubmitData()
* @param seekable true if the song is seekable
* @param duration the total duration of this song; negative if
* unknown
*/
virtual void Ready(AudioFormat audio_format,
bool seekable, SignedSongTime duration) = 0;
/**
* Determines the pending decoder command.
*
* @return the current command, or DecoderCommand::NONE if there is no
* command pending
*/
gcc_pure
virtual DecoderCommand GetCommand() = 0;
/**
* Called by the decoder when it has performed the requested command
* (dc->command). This function resets dc->command and wakes up the
* player thread.
*/
virtual void CommandFinished() = 0;
/**
* Call this when you have received the DecoderCommand::SEEK command.
*
* @return the destination position for the seek in milliseconds
*/
gcc_pure
virtual SongTime GetSeekTime() = 0;
/**
* Call this when you have received the DecoderCommand::SEEK command.
*
* @return the destination position for the seek in frames
*/
gcc_pure
virtual uint64_t GetSeekFrame() = 0;
/**
* Call this instead of CommandFinished() when seeking has
* failed.
*/
virtual void SeekError() = 0;
/**
* Open a new #InputStream and wait until it's ready.
*
* Throws #StopDecoder if DecoderCommand::STOP was received.
*
* Throws std::runtime_error on error.
*/
virtual InputStreamPtr OpenUri(const char *uri) = 0;
/**
* Blocking read from the input stream.
*
* @param is the input stream to read from
* @param buffer the destination buffer
* @param length the maximum number of bytes to read
* @return the number of bytes read, or 0 if one of the following
* occurs: end of file; error; command (like SEEK or STOP).
*/
virtual size_t Read(InputStream &is, void *buffer, size_t length) = 0;
/**
* Sets the time stamp for the next data chunk [seconds]. The MPD
* core automatically counts it up, and a decoder plugin only needs to
* use this function if it thinks that adding to the time stamp based
* on the buffer size won't work.
*/
virtual void SubmitTimestamp(double t) = 0;
/**
* This function is called by the decoder plugin when it has
* successfully decoded block of input data.
*
* @param is an input stream which is buffering while we are waiting
* for the player
* @param data the source buffer
* @param length the number of bytes in the buffer
* @return the current command, or DecoderCommand::NONE if there is no
* command pending
*/
virtual DecoderCommand SubmitData(InputStream *is,
const void *data, size_t length,
uint16_t kbit_rate) = 0;
DecoderCommand SubmitData(InputStream &is,
const void *data, size_t length,
uint16_t kbit_rate) {
return SubmitData(&is, data, length, kbit_rate);
}
/**
* This function is called by the decoder plugin when it has
* successfully decoded a tag.
*
* @param is an input stream which is buffering while we are waiting
* for the player
* @param tag the tag to send
* @return the current command, or DecoderCommand::NONE if there is no
* command pending
*/
virtual DecoderCommand SubmitTag(InputStream *is, Tag &&tag) = 0 ;
DecoderCommand SubmitTag(InputStream &is, Tag &&tag) {
return SubmitTag(&is, std::move(tag));
}
/**
* Set replay gain values for the following chunks.
*
* @param replay_gain_info the replay_gain_info object; may be nullptr
* to invalidate the previous replay gain values
*/
virtual void SubmitReplayGain(const ReplayGainInfo *replay_gain_info) = 0;
/**
* Store MixRamp tags.
*/
virtual void SubmitMixRamp(MixRampInfo &&mix_ramp) = 0;
};
#endif
|
