/*
* Copyright (C) 2003-2015 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_HXX
#define MPD_DECODER_API_HXX
// IWYU pragma: begin_exports
#include "check.h"
#include "DecoderCommand.hxx"
#include "DecoderPlugin.hxx"
#include "ReplayGainInfo.hxx"
#include "tag/Tag.hxx"
#include "AudioFormat.hxx"
#include "MixRampInfo.hxx"
#include "config/Block.hxx"
#include "Chrono.hxx"
// IWYU pragma: end_exports
#include <stdint.h>
class Error;
/**
* 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 duration the total duration of this song; negative if
* unknown
*/
void
decoder_initialized(Decoder &decoder,
AudioFormat audio_format,
bool seekable, SignedSongTime duration);
/**
* Determines the pending decoder command.
*
* @param decoder the decoder object
* @return the current command, or DecoderCommand::NONE if there is no
* command pending
*/
gcc_pure
DecoderCommand
decoder_get_command(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(Decoder &decoder);
/**
* Call this when you have received the DecoderCommand::SEEK command.
*
* @param decoder the decoder object
* @return the destination position for the seek in milliseconds
*/
gcc_pure
SongTime
decoder_seek_time(Decoder &decoder);
/**
* Call this when you have received the DecoderCommand::SEEK command.
*
* @param decoder the decoder object
* @return the destination position for the seek in frames
*/
gcc_pure
uint64_t
decoder_seek_where_frame(Decoder &decoder);
/**
* Call this instead of decoder_command_finished() when seeking has
* failed.
*
* @param decoder the decoder object
*/
void
decoder_seek_error(Decoder &decoder);
/**
* Open a new #InputStream and wait until it's ready. Can get
* cancelled by DecoderCommand::STOP (returns nullptr without setting
* #Error).
*/
InputStream *
decoder_open_uri(Decoder &decoder, const char *uri, Error &error);
/**
* 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(Decoder *decoder, InputStream &is,
void *buffer, size_t length);
static inline size_t
decoder_read(Decoder &decoder, InputStream &is,
void *buffer, size_t length)
{
return decoder_read(&decoder, is, buffer, length);
}
/**
* Blocking read from the input stream. Attempts to fill the buffer
* completely; there is no partial result.
*
* @return true on success, false on error or command or not enough
* data
*/
bool
decoder_read_full(Decoder *decoder, InputStream &is,
void *buffer, size_t size);
/**
* Skip data on the #InputStream.
*
* @return true on success, false on error or command
*/
bool
decoder_skip(Decoder *decoder, InputStream &is, size_t size);
/**
* 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(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 DecoderCommand::NONE if there is no
* command pending
*/
DecoderCommand
decoder_data(Decoder &decoder, InputStream *is,
const void *data, size_t length,
uint16_t kbit_rate);
static inline DecoderCommand
decoder_data(Decoder &decoder, InputStream &is,
const void *data, size_t length,
uint16_t kbit_rate)
{
return decoder_data(decoder, &is, data, length, kbit_rate);
}
/**
* 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 DecoderCommand::NONE if there is no
* command pending
*/
DecoderCommand
decoder_tag(Decoder &decoder, InputStream *is, Tag &&tag);
static inline DecoderCommand
decoder_tag(Decoder &decoder, InputStream &is, Tag &&tag)
{
return decoder_tag(decoder, &is, std::move(tag));
}
/**
* Set replay gain values for the following chunks.
*
* @param decoder the decoder object
* @param rgi the replay_gain_info object; may be nullptr to invalidate
* the previous replay gain values
*/
void
decoder_replay_gain(Decoder &decoder,
const ReplayGainInfo *replay_gain_info);
/**
* Store MixRamp tags.
*
* @param decoder the decoder object
* @param mixramp_start the mixramp_start tag; may be nullptr to invalidate
* @param mixramp_end the mixramp_end tag; may be nullptr to invalidate
*/
void
decoder_mixramp(Decoder &decoder, MixRampInfo &&mix_ramp);
#endif
