aboutsummaryrefslogtreecommitdiffstats
path: root/src/decoder_api.h
blob: 9df6bed1970dab653f35b68ec5655f0518ac19ef (plain) (blame)
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
/*
 * Copyright (C) 2003-2009 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.
 */

/*! \file
 * \brief The MPD Decoder API
 *
 * This is the public API which is used by decoder plugins to
 * communicate with the mpd core.
 */

#ifndef MPD_DECODER_API_H
#define MPD_DECODER_API_H

#include "check.h"
#include "decoder_command.h"
#include "decoder_plugin.h"
#include "input_stream.h"
#include "replay_gain.h"
#include "tag.h"
#include "audio_format.h"
#include "conf.h"

#include <stdbool.h>

/**
 * Notify the player thread that it has finished initialization and
 * that it has read the song's meta data.
 *
 * @param decoder the decoder object
 * @param audio_format the audio format which is going to be sent to
 * decoder_data()
 * @param seekable true if the song is seekable
 * @param total_time the total number of seconds in this song; -1 if unknown
 */
void
decoder_initialized(struct decoder *decoder,
		    const struct audio_format *audio_format,
		    bool seekable, float total_time);

/**
 * Returns the URI of the current song in UTF-8 encoding.
 *
 * @param decoder the decoder object
 * @return an allocated string which must be freed with g_free()
 */
char *
decoder_get_uri(struct decoder *decoder);

/**
 * Determines the pending decoder command.
 *
 * @param decoder the decoder object
 * @return the current command, or DECODE_COMMAND_NONE if there is no
 * command pending
 */
enum decoder_command
decoder_get_command(struct decoder *decoder);

/**
 * Called by the decoder when it has performed the requested command
 * (dc->command).  This function resets dc->command and wakes up the
 * player thread.
 *
 * @param decoder the decoder object
 */
void
decoder_command_finished(struct decoder *decoder);

/**
 * Call this when you have received the DECODE_COMMAND_SEEK command.
 *
 * @param decoder the decoder object
 * @return the destination position for the week
 */
double
decoder_seek_where(struct decoder *decoder);

/**
 * Call this right before decoder_command_finished() when seeking has
 * failed.
 *
 * @param decoder the decoder object
 */
void
decoder_seek_error(struct decoder *decoder);

/**
 * Blocking read from the input stream.
 *
 * @param decoder the decoder object
 * @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).
 */
size_t
decoder_read(struct decoder *decoder, struct input_stream *is,
	     void *buffer, size_t length);

/**
 * 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.
 */
void
decoder_timestamp(struct decoder *decoder, double t);

/**
 * This function is called by the decoder plugin when it has
 * successfully decoded block of input data.
 *
 * @param decoder the decoder object
 * @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 DECODE_COMMAND_NONE if there is no
 * command pending
 */
enum decoder_command
decoder_data(struct decoder *decoder, struct input_stream *is,
	     const void *data, size_t length,
	     uint16_t kbit_rate,
	     struct replay_gain_info *replay_gain_info);

/**
 * This function is called by the decoder plugin when it has
 * successfully decoded a tag.
 *
 * @param decoder the decoder object
 * @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 DECODE_COMMAND_NONE if there is no
 * command pending
 */
enum decoder_command
decoder_tag(struct decoder *decoder, struct input_stream *is,
	    const struct tag *tag);

#endif