/* Copyright (C) 2014 J.F.Dockes
* 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 _RCVQUEUE_H_INCLUDED_
#define _RCVQUEUE_H_INCLUDED_
#include "workqueue.h"
/*
* The audio messages which get passed between the songcast receiver
* and the http server part. We could probably use ohSongcast own audio
* messages, but I prefer to stop the custom type usage asap.
*/
class AudioMessage {
public:
// If buf is not 0, it is a malloced buffer, and we take
// ownership. The caller MUST NOT free it. Its size must be at
// least (bits/8) * chans * samples
AudioMessage(unsigned int bits, unsigned int channels, unsigned int samples,
unsigned int sampfreq, char *buf = 0)
: m_bits(bits), m_chans(channels), m_freq(sampfreq),
m_bytes(buf ? (bits/8) * channels * samples : 0), m_buf(buf),
m_curoffs(0) {
}
~AudioMessage() {
if (m_buf)
free(m_buf);
}
unsigned int m_bits;
unsigned int m_chans;
unsigned int m_freq;
unsigned int m_bytes;
char *m_buf;
unsigned int m_curoffs; /* Used by the http data emitter */
};
// Def for the downstream module which can be using either http to mpd
// or direct alsa. No effort is done for easy expansion to other
// modules, e.g. this would need to add stuff to the Context thing
// etc. but this seems sufficient for expected needs.
// Note that the module does not derive from this class, it initializes an
// object with appropriate values.
class AudioEater {
public:
enum BOrder {BO_MSB, BO_LSB, BO_HOST};
struct Context {
Context(WorkQueue<AudioMessage*> *q, int p = 0) : port(p), queue(q) {}
int port;
WorkQueue<AudioMessage*> *queue;
std::string alsadevice;
};
// Constructor called by downstream module to set its params
AudioEater(BOrder o, void *(*w)(void *))
: input_border(o), worker(w) {
}
BOrder input_border;
/** Worker routine for fetching bufs from the rcvqueue and sending them
* further. The param is actually an AudioEater::Context */
void *(*worker)(void *);
};
extern AudioEater httpAudioEater;
extern AudioEater alsaAudioEater;
#endif /* _RCVQUEUE_H_INCLUDED_ */