/* -*- c-basic-offset: 8 -*-   rdesktop: A Remote Desktop Protocol client.   Sound Channel Process Functions - SGI/IRIX   Copyright (C) Matthew Chapman 2003-2007   Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003   Copyright (C) Jeremy Meng void.foo@gmail.com 2004, 2005   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., 675 Mass Ave, Cambridge, MA 02139, USA.*/#include "rdesktop.h"#include <errno.h>#include <dmedia/audio.h>/* #define IRIX_DEBUG 1 */#define IRIX_MAX_VOL     65535ALconfig audioconfig;ALport output_port;static int g_snd_rate;static int width = AL_SAMPLE_16;static char *sgi_output_device = NULL;double min_volume, max_volume, volume_range;int resource, maxFillable;int combinedFrameSize;void sgi_play(void);voidsgi_add_fds(int *n, fd_set * rfds, fd_set * wfds, struct timeval *tv){	/* We need to be called rather often... */	if (output_port != (ALport) 0 && !rdpsnd_queue_empty())		FD_SET(0, wfds);}voidsgi_check_fds(fd_set * rfds, fd_set * wfds){	if (output_port == (ALport) 0)		return;	if (!rdpsnd_queue_empty())		sgi_play();}RD_BOOLsgi_open(void){	ALparamInfo pinfo;	static int warned = 0;#if (defined(IRIX_DEBUG))	fprintf(stderr, "sgi_open: begin\n");#endif	if (!warned && sgi_output_device)	{		warning("device-options not supported for libao-driver\n");		warned = 1;	}	if (alGetParamInfo(AL_DEFAULT_OUTPUT, AL_GAIN, &pinfo) < 0)	{		fprintf(stderr, "sgi_open: alGetParamInfo failed: %s\n",			alGetErrorString(oserror()));	}	min_volume = alFixedToDouble(pinfo.min.ll);	max_volume = alFixedToDouble(pinfo.max.ll);	volume_range = (max_volume - min_volume);#if (defined(IRIX_DEBUG))	fprintf(stderr, "sgi_open: minvol = %lf, maxvol= %lf, range = %lf.\n",		min_volume, max_volume, volume_range);#endif	audioconfig = alNewConfig();	if (audioconfig == (ALconfig) 0)	{		fprintf(stderr, "sgi_open: alNewConfig failed: %s\n", alGetErrorString(oserror()));		return False;	}	output_port = alOpenPort("rdpsnd", "w", 0);	if (output_port == (ALport) 0)	{		fprintf(stderr, "sgi_open: alOpenPort failed: %s\n", alGetErrorString(oserror()));		return False;	}#if (defined(IRIX_DEBUG))	fprintf(stderr, "sgi_open: returning\n");#endif	return True;}voidsgi_close(void){	/* Ack all remaining packets */#if (defined(IRIX_DEBUG))	fprintf(stderr, "sgi_close: begin\n");#endif	while (!rdpsnd_queue_empty())		rdpsnd_queue_next(0);	alDiscardFrames(output_port, 0);	alClosePort(output_port);	output_port = (ALport) 0;	alFreeConfig(audioconfig);#if (defined(IRIX_DEBUG))	fprintf(stderr, "sgi_close: returning\n");#endif}RD_BOOLsgi_format_supported(RD_WAVEFORMATEX * pwfx){	if (pwfx->wFormatTag != WAVE_FORMAT_PCM)		return False;	if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))		return False;	if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))		return False;	return True;}RD_BOOLsgi_set_format(RD_WAVEFORMATEX * pwfx){	int channels;	int frameSize, channelCount;	ALpv params;#if (defined(IRIX_DEBUG))	fprintf(stderr, "sgi_set_format: init...\n");#endif	if (pwfx->wBitsPerSample == 8)		width = AL_SAMPLE_8;	else if (pwfx->wBitsPerSample == 16)		width = AL_SAMPLE_16;	/* Limited support to configure an opened audio port in IRIX.  The	   number of channels is a static setting and can not be changed after	   a port is opened.  So if the number of channels remains the same, we	   can configure other settings; otherwise we have to reopen the audio	   port, using same config. */	channels = pwfx->nChannels;	g_snd_rate = pwfx->nSamplesPerSec;	alSetSampFmt(audioconfig, AL_SAMPFMT_TWOSCOMP);	alSetWidth(audioconfig, width);	if (channels != alGetChannels(audioconfig))	{		alClosePort(output_port);		alSetChannels(audioconfig, channels);		output_port = alOpenPort("rdpsnd", "w", audioconfig);		if (output_port == (ALport) 0)		{			fprintf(stderr, "sgi_set_format: alOpenPort failed: %s\n",				alGetErrorString(oserror()));			return False;		}	}	resource = alGetResource(output_port);	maxFillable = alGetFillable(output_port);	channelCount = alGetChannels(audioconfig);	frameSize = alGetWidth(audioconfig);	if (frameSize == 0 || channelCount == 0)	{		fprintf(stderr, "sgi_set_format: bad frameSize or channelCount\n");		return False;	}	combinedFrameSize = frameSize * channelCount;	params.param = AL_RATE;	params.value.ll = (long long) g_snd_rate << 32;	if (alSetParams(resource, &params, 1) < 0)	{		fprintf(stderr, "wave_set_format: alSetParams failed: %s\n",			alGetErrorString(oserror()));		return False;	}	if (params.sizeOut < 0)	{		fprintf(stderr, "wave_set_format: invalid rate %d\n", g_snd_rate);		return False;	}#if (defined(IRIX_DEBUG))	fprintf(stderr, "sgi_set_format: returning...\n");#endif	return True;}voidsgi_volume(uint16 left, uint16 right){	double gainleft, gainright;	ALpv pv[1];	ALfixed gain[8];#if (defined(IRIX_DEBUG))	fprintf(stderr, "sgi_volume: begin\n");	fprintf(stderr, "left='%d', right='%d'\n", left, right);#endif	gainleft = (double) left / IRIX_MAX_VOL;	gainright = (double) right / IRIX_MAX_VOL;	gain[0] = alDoubleToFixed(min_volume + gainleft * volume_range);	gain[1] = alDoubleToFixed(min_volume + gainright * volume_range);	pv[0].param = AL_GAIN;	pv[0].value.ptr = gain;	pv[0].sizeIn = 8;	if (alSetParams(AL_DEFAULT_OUTPUT, pv, 1) < 0)	{		fprintf(stderr, "sgi_volume: alSetParams failed: %s\n",			alGetErrorString(oserror()));		return;	}#if (defined(IRIX_DEBUG))	fprintf(stderr, "sgi_volume: returning\n");#endif}voidsgi_play(void){	struct audio_packet *packet;	ssize_t len;	unsigned int i;	STREAM out;	int gf;	while (1)	{		if (rdpsnd_queue_empty())			return;		packet = rdpsnd_queue_current_packet();		out = &packet->s;		len = out->end - out->p;		alWriteFrames(output_port, out->p, len / combinedFrameSize);		out->p += len;		if (out->p == out->end)		{			gf = alGetFilled(output_port);			if (gf < (4 * maxFillable / 10))			{				rdpsnd_queue_next(0);			}			else			{#if (defined(IRIX_DEBUG))/*  				fprintf(stderr,"Busy playing...\n"); */#endif				usleep(10);				return;			}		}	}}struct audio_driver *sgi_register(char *options){	static struct audio_driver sgi_driver;	memset(&sgi_driver, 0, sizeof(sgi_driver));	sgi_driver.name = "sgi";	sgi_driver.description = "SGI output driver";	sgi_driver.add_fds = sgi_add_fds;	sgi_driver.check_fds = sgi_check_fds;	sgi_driver.wave_out_open = sgi_open;	sgi_driver.wave_out_close = sgi_close;	sgi_driver.wave_out_format_supported = sgi_format_supported;	sgi_driver.wave_out_set_format = sgi_set_format;	sgi_driver.wave_out_volume = sgi_volume;	sgi_driver.need_byteswap_on_be = 1;	sgi_driver.need_resampling = 0;	if (options)	{		sgi_output_device = xstrdup(options);	}	return &sgi_driver;}