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/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* Copyright (C) 2008 Max Kellermann <max@duempel.org>
* This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef DECODER_API_H
#define DECODER_API_H
/*
* This is the public API which is used by decoder plugins to
* communicate with the mpd core.
*
*/
#include "inputStream.h"
#include "replayGain.h"
#include "tag.h"
#include "tag_id3.h"
#include "audio_format.h"
#include "playerData.h"
/* valid values for streamTypes in the InputPlugin struct: */
#define INPUT_PLUGIN_STREAM_FILE 0x01
#define INPUT_PLUGIN_STREAM_URL 0x02
enum decoder_command {
DECODE_COMMAND_NONE = 0,
DECODE_COMMAND_START,
DECODE_COMMAND_STOP,
DECODE_COMMAND_SEEK
};
struct decoder;
/* optional, set this to NULL if the InputPlugin doesn't have/need one
* this must return < 0 if there is an error and >= 0 otherwise */
typedef int (*decoder_init_func) (void);
/* optional, set this to NULL if the InputPlugin doesn't have/need one */
typedef void (*decoder_finish_func) (void);
/* boolean return value, returns 1 if the InputStream is decodable by
* the InputPlugin, 0 if not */
typedef unsigned int (*decoder_try_decode_func) (InputStream *);
/* this will be used to decode InputStreams, and is recommended for files
* and networked (HTTP) connections.
*
* returns -1 on error, 0 on success */
typedef int (*decoder_stream_decode_func) (struct decoder *, InputStream *);
/* use this if and only if your InputPlugin can only be passed a filename or
* handle as input, and will not allow callbacks to be set (like Ogg-Vorbis
* and FLAC libraries allow)
*
* returns -1 on error, 0 on success */
typedef int (*decoder_file_decode_func) (struct decoder *, char *path);
/* file should be the full path! Returns NULL if a tag cannot be found
* or read */
typedef struct tag *(*decoder_tag_dup_func) (char *file);
struct decoder_plugin {
const char *name;
decoder_init_func init_func;
decoder_finish_func finish_func;
decoder_try_decode_func try_decode_func;
decoder_stream_decode_func stream_decode_func;
decoder_file_decode_func file_decode_func;
decoder_tag_dup_func tag_dup_func;
/* one or more of the INPUT_PLUGIN_STREAM_* values OR'd together */
unsigned char stream_types;
/* last element in these arrays must always be a NULL: */
const char *const*suffixes;
const char *const*mime_types;
};
void decoder_plugin_register(struct decoder_plugin *plugin);
void decoder_plugin_unregister(struct decoder_plugin *plugin);
/**
* Opaque handle which the decoder plugin passes to the functions in
* this header.
*/
struct decoder;
/**
* Notify the player thread that it has finished initialization and
* that it has read the song's meta data.
*/
void decoder_initialized(struct decoder * decoder,
const struct audio_format *audio_format,
float total_time);
const char *decoder_get_url(struct decoder * decoder, char * buffer);
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.
*/
void decoder_command_finished(struct decoder * decoder);
double decoder_seek_where(struct decoder * decoder);
void decoder_seek_error(struct decoder * decoder);
/**
* Blocking read from the input stream. Returns 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,
InputStream *inStream,
void *buffer, size_t length);
/**
* This function is called by the decoder plugin when it has
* successfully decoded block of input data.
*
* We send inStream for buffering the inputStream while waiting to
* send the next chunk
*/
enum decoder_command
decoder_data(struct decoder *decoder, InputStream * inStream, int seekable,
void *data, size_t datalen, float data_time, mpd_uint16 bitRate,
ReplayGainInfo * replayGainInfo);
void decoder_flush(struct decoder *decoder);
void decoder_clear(struct decoder *decoder);
#endif
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