arts.c
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/*
arts: audio output via aRts Sound Daemon
copyright 2007-8 by the mpg123 project - free software under the terms of the LGPL 2.1
see COPYING and AUTHORS files in distribution or http://mpg123.org
initially written by Stefan Lenselink (Stefan@lenselink.org)
*/
#include "out123_int.h"
#include <artsc.h>
#include "debug.h"
typedef struct
{
arts_stream_t arse; /* That's short for ARts StrEam;-) */
} mpg123_arts_t;
static int open_arts(out123_handle *ao)
{
short bits = 0;
if(!ao) return -1;
if(ao->format < 0)
{
ao->format = MPG123_ENC_SIGNED_16;
ao->rate = 44100;
ao->channels = 2;
}
/* Trial and error revealed these two formats to work with aRts. */
if(ao->format == MPG123_ENC_SIGNED_16) bits = 16;
else if(ao->format == MPG123_ENC_UNSIGNED_8) bits = 8;
else return -1;
/* Initialize the aRts lib*/
arts_init();
/* Open a stream to the aRts server */
((mpg123_arts_t*)ao->userptr)->arse = arts_play_stream( ao->rate, bits, ao->channels, "mpg123" );
/* Yeah, black box and all... it's still a pointer that is NULL on error. */
return (void*)((mpg123_arts_t*)ao->userptr)->arse == NULL ? -1 : 0;
}
static int get_formats_arts(out123_handle *ao)
{
/* aRts runs not everything, but any rate. */
return MPG123_ENC_SIGNED_16|MPG123_ENC_UNSIGNED_8;
}
static int write_arts(out123_handle *ao,unsigned char *buf,int len)
{
/* PIPE the PCM forward to the aRts Sound Daemon */
return arts_write( ((mpg123_arts_t*)ao->userptr)->arse , buf, len);
}
static int close_arts(out123_handle *ao)
{
/* Close the connection! */
arts_close_stream( ((mpg123_arts_t*)ao->userptr)->arse );
/* Free the memory allocated*/
arts_free();
return 0;
}
static void flush_arts(out123_handle *ao)
{
/* aRts doesn't have a flush statement! */
}
static int deinit_arts(out123_handle* ao)
{
if(ao->userptr)
{
free(ao->userptr);
ao->userptr = NULL;
}
arts_free();
return 0;
}
static int init_arts(out123_handle* ao)
{
if (ao==NULL) return -1;
ao->userptr = malloc(sizeof(mpg123_arts_t));
if(ao->userptr == NULL)
{
error("Out of memory!");
return -1;
}
/* clear it to have a consistent state */
memset(ao->userptr, 0, sizeof(mpg123_arts_t));
/* Set callbacks */
ao->open = open_arts;
ao->flush = flush_arts;
ao->write = write_arts;
ao->get_formats = get_formats_arts;
ao->close = close_arts;
ao->deinit = deinit_arts;
/* Success */
return 0;
}
/*
Module information data structure
*/
mpg123_module_t mpg123_output_module_info = {
/* api_version */ MPG123_MODULE_API_VERSION,
/* name */ "arts",
/* description */ "Output audio using aRts Sound Daemon",
/* revision */ "$Rev: $",
/* handle */ NULL,
/* init_output */ init_arts,
};