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/*
ao_sgi - sgi/irix output plugin for MPlayer
22oct2001 oliver.schoenbrunner@jku.at
*/
#include <stdio.h>
#include <stdlib.h>
#include <dmedia/audio.h>
#include "audio_out.h"
#include "audio_out_internal.h"
static ao_info_t info =
{
"sgi audio output",
"sgi",
"kopflos",
""
};
LIBAO_EXTERN(sgi)
static ALconfig ao_config;
static ALport ao_port;
static int sample_rate;
static int queue_size;
// to set/get/query special features/parameters
static int control(int cmd, void *arg){
printf("ao_sgi, control\n");
return -1;
}
// open & setup audio device
// return: 1=success 0=fail
static int init(int rate, int channels, int format, int flags) {
printf("ao_sgi, init: Samplerate: %iHz Channels: %s Format %s\n", rate, (channels > 1) ? "Stereo" : "Mono", audio_out_format_name(format));
{ /* from /usr/share/src/dmedia/audio/setrate.c */
int fd;
int rv;
double frate;
ALpv x[2];
rv = alGetResourceByName(AL_SYSTEM, "out.analog", AL_DEVICE_TYPE);
if (!rv) {
printf("ao_sgi, play: invalid device\n");
return 0;
}
frate = rate;
x[0].param = AL_RATE;
x[0].value.ll = alDoubleToFixed(rate);
x[1].param = AL_MASTER_CLOCK;
x[1].value.i = AL_CRYSTAL_MCLK_TYPE;
if (alSetParams(rv,x, 2)<0) {
printf("ao_sgi, init: setparams failed: %s\n", alGetErrorString(oserror()));
printf("ao_sgi, init: could not set desired samplerate\n");
}
if (x[0].sizeOut < 0) {
printf("ao_sgi, init: AL_RATE was not accepted on the given resource\n");
}
if (alGetParams(rv,x, 1)<0) {
printf("ao_sgi, init: getparams failed: %s\n", alGetErrorString(oserror()));
}
if (frate != alFixedToDouble(x[0].value.ll)) {
printf("ao_sgi, init: samplerate is now %lf (desired rate is %lf)\n", alFixedToDouble(x[0].value.ll), frate);
}
sample_rate = (int)frate;
}
ao_data.buffersize=131072;
ao_data.outburst = ao_data.buffersize/16;
ao_data.channels = channels;
ao_config = alNewConfig();
if (!ao_config) {
printf("ao_sgi, init: %s\n", alGetErrorString(oserror()));
return 0;
}
if(channels == 2) alSetChannels(ao_config, AL_STEREO);
else alSetChannels(ao_config, AL_MONO);
alSetWidth(ao_config, AL_SAMPLE_16);
alSetSampFmt(ao_config, AL_SAMPFMT_TWOSCOMP);
alSetQueueSize(ao_config, 48000);
if (alSetDevice(ao_config, AL_DEFAULT_OUTPUT) < 0) {
printf("ao_sgi, init: %s\n", alGetErrorString(oserror()));
return 0;
}
ao_port = alOpenPort("mplayer", "w", ao_config);
if (!ao_port) {
printf("ao_sgi, init: Unable to open audio channel: %s\n", alGetErrorString(oserror()));
return 0;
}
// printf("ao_sgi, init: port %d config %d\n", ao_port, ao_config);
queue_size = alGetQueueSize(ao_config);
return 1;
}
// close audio device
static void uninit() {
/* TODO: samplerate should be set back to the value before mplayer was started! */
printf("ao_sgi, uninit: ...\n");
if (ao_port) {
while(alGetFilled(ao_port) > 0) sginap(1);
alClosePort(ao_port);
alFreeConfig(ao_config);
}
}
// stop playing and empty buffers (for seeking/pause)
static void reset() {
printf("ao_sgi, reset: ...\n");
}
// stop playing, keep buffers (for pause)
static void audio_pause() {
printf("ao_sgi, audio_pause: ...\n");
}
// resume playing, after audio_pause()
static void audio_resume() {
printf("ao_sgi, audio_resume: ...\n");
}
// return: how many bytes can be played without blocking
static int get_space() {
// printf("ao_sgi, get_space: (ao_outburst %d)\n", ao_outburst);
// printf("ao_sgi, get_space: alGetFillable [%d] \n", alGetFillable(ao_port));
return alGetFillable(ao_port)*(2*ao_data.channels);
}
// plays 'len' bytes of 'data'
// it should round it down to outburst*n
// return: number of bytes played
static int play(void* data, int len, int flags) {
// printf("ao_sgi, play: len %d flags %d (%d %d)\n", len, flags, ao_port, ao_config);
// printf("channels %d\n", ao_channels);
alWriteFrames(ao_port, data, len/(2*ao_data.channels));
return len;
}
// return: delay in seconds between first and last sample in buffer
static float get_delay(){
// printf("ao_sgi, get_delay: (ao_buffersize %d)\n", ao_buffersize);
//return 0;
return (float)queue_size/((float)sample_rate);
}
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