100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2003-2011 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 ICY_METADATA_H
|
|
#define ICY_METADATA_H
|
|
|
|
#include <stdbool.h>
|
|
#include <stddef.h>
|
|
|
|
struct icy_metadata {
|
|
size_t data_size, data_rest;
|
|
|
|
size_t meta_size, meta_position;
|
|
char *meta_data;
|
|
|
|
struct tag *tag;
|
|
};
|
|
|
|
/**
|
|
* Initialize a disabled icy_metadata object.
|
|
*/
|
|
static inline void
|
|
icy_clear(struct icy_metadata *im)
|
|
{
|
|
im->data_size = 0;
|
|
}
|
|
|
|
/**
|
|
* Initialize an enabled icy_metadata object with the specified
|
|
* data_size (from the icy-metaint HTTP response header).
|
|
*/
|
|
static inline void
|
|
icy_start(struct icy_metadata *im, size_t data_size)
|
|
{
|
|
im->data_size = im->data_rest = data_size;
|
|
im->meta_size = 0;
|
|
im->tag = NULL;
|
|
}
|
|
|
|
/**
|
|
* Resets the icy_metadata. Call this after rewinding the stream.
|
|
*/
|
|
void
|
|
icy_reset(struct icy_metadata *im);
|
|
|
|
void
|
|
icy_deinit(struct icy_metadata *im);
|
|
|
|
/**
|
|
* Checks whether the icy_metadata object is enabled.
|
|
*/
|
|
static inline bool
|
|
icy_defined(const struct icy_metadata *im)
|
|
{
|
|
return im->data_size > 0;
|
|
}
|
|
|
|
/**
|
|
* Evaluates data. Returns the number of bytes of normal data which
|
|
* can be read by the caller, but not more than "length". If the
|
|
* return value is smaller than "length", the caller should invoke
|
|
* icy_meta().
|
|
*/
|
|
size_t
|
|
icy_data(struct icy_metadata *im, size_t length);
|
|
|
|
/**
|
|
* Reads metadata from the stream. Returns the number of bytes
|
|
* consumed. If the return value is smaller than "length", the caller
|
|
* should invoke icy_data().
|
|
*/
|
|
size_t
|
|
icy_meta(struct icy_metadata *im, const void *data, size_t length);
|
|
|
|
static inline struct tag *
|
|
icy_tag(struct icy_metadata *im)
|
|
{
|
|
struct tag *tag = im->tag;
|
|
im->tag = NULL;
|
|
return tag;
|
|
}
|
|
|
|
#endif
|