#include <stdio.h>#include <stdlib.h>#include "audio.h"struct parameter param = { 0,0,0,0,0,0 };void audio_info_struct_init(struct audio_info_struct *ai){  ai->fn = -1;#ifdef SGI#if 0  ALconfig config;  ALport port;#endif#endif  ai->rate = -1;  ai->gain = -1;  ai->output = -1;  ai->device = NULL;  ai->channels = -1;  ai->format = -1;}#define NUM_CHANNELS 2#define NUM_ENCODINGS 6#define NUM_RATES 10struct audio_name audio_val2name[NUM_ENCODINGS+1] = { { AUDIO_FORMAT_SIGNED_16  , "signed 16 bit" , "s16 " } , { AUDIO_FORMAT_UNSIGNED_16, "unsigned 16 bit" , "u16 " } ,   { AUDIO_FORMAT_UNSIGNED_8 , "unsigned 8 bit" , "u8  " } , { AUDIO_FORMAT_SIGNED_8   , "signed 8 bit" , "s8  " } , { AUDIO_FORMAT_ULAW_8     , "mu-law (8 bit)" , "ulaw " } , { AUDIO_FORMAT_ALAW_8     , "a-law (8 bit)" , "alaw " } , { -1 , NULL }};#if 0static char *channel_name[NUM_CHANNELS] =  { "mono" , "stereo" };#endifstatic int channels[NUM_CHANNELS] = { 1 , 2 };static int rates[NUM_RATES] = { 	 8000, 11025, 12000, 	16000, 22050, 24000,	32000, 44100, 48000,	8000	/* 8000 = dummy for user forced */};static int encodings[NUM_ENCODINGS] = { AUDIO_FORMAT_SIGNED_16,  AUDIO_FORMAT_UNSIGNED_16, AUDIO_FORMAT_UNSIGNED_8, AUDIO_FORMAT_SIGNED_8, AUDIO_FORMAT_ULAW_8, AUDIO_FORMAT_ALAW_8};static char capabilities[NUM_CHANNELS][NUM_ENCODINGS][NUM_RATES];void audio_capabilities(struct audio_info_struct *ai){	int fmts;	int i,j,k,k1=NUM_RATES-1;	struct audio_info_struct ai1 = *ai;        if (param.outmode != DECODE_AUDIO) {		memset(capabilities,1,sizeof(capabilities));		return;	}	memset(capabilities,0,sizeof(capabilities));	if(param.force_rate) {		rates[NUM_RATES-1] = param.force_rate;		k1 = NUM_RATES;	}	audio_open(&ai1);	for(i=0;i<NUM_CHANNELS;i++) {		for(j=0;j<NUM_RATES;j++) {			ai1.channels = channels[i];			ai1.rate = rates[j];			fmts = audio_get_formats(&ai1);			if(fmts < 0)				continue;			for(k=0;k<NUM_ENCODINGS;k++) {				if((fmts & encodings[k]) == encodings[k])					capabilities[i][k][j] = 1;			}		}	}	audio_close(&ai1);	if(param.verbose > 1) {		fprintf(stderr,"\nAudio capabilties:\n        |");		for(j=0;j<NUM_ENCODINGS;j++) {			fprintf(stderr," %5s |",audio_val2name[j].sname);		}		fprintf(stderr,"\n --------------------------------------------------------\n");		for(k=0;k<k1;k++) {			fprintf(stderr," %5d  |",rates[k]);			for(j=0;j<NUM_ENCODINGS;j++) {				if(capabilities[0][j][k]) {					if(capabilities[1][j][k])						fprintf(stderr,"  M/S  |");					else						fprintf(stderr,"   M   |");				}				else if(capabilities[1][j][k])					fprintf(stderr,"   S   |");				else					fprintf(stderr,"       |");			}			fprintf(stderr,"\n");		}		fprintf(stderr,"\n");	}}static int rate2num(int r){	int i;	for(i=0;i<NUM_RATES;i++) 		if(rates[i] == r)			return i;	return -1;}static int audio_fit_cap_helper(struct audio_info_struct *ai,int rn,int f0,int f2,int c){	int i;        if(rn >= 0) {                for(i=f0;i<f2;i++) {                        if(capabilities[c][i][rn]) {                                ai->rate = rates[rn];                                ai->format = encodings[i];                                ai->channels = channels[c];				return 1;                        }                }        }	return 0;}/* * c=num of channels of stream * r=rate of stream */void audio_fit_capabilities(struct audio_info_struct *ai,int c,int r){	int rn;	int f0=0;		if(param.force_8bit) {		f0 = 2;	}	c--; /* stereo=1 ,mono=0 */	if(param.force_mono >= 0)		c = 0;	if(param.force_stereo)		c = 1;	if(param.force_rate) {		rn = rate2num(param.force_rate);		if(audio_fit_cap_helper(ai,rn,f0,2,c))			return;		if(audio_fit_cap_helper(ai,rn,2,NUM_ENCODINGS,c))			return;		if(c == 1 && !param.force_stereo)			c = 0;		else if(c == 0 && !param.force_mono)			c = 1;		if(audio_fit_cap_helper(ai,rn,f0,2,c))			return;		if(audio_fit_cap_helper(ai,rn,2,NUM_ENCODINGS,c))			return;		fprintf(stderr,"No supported rate found!\n");		exit(1);	}	rn = rate2num(r>>0);	if(audio_fit_cap_helper(ai,rn,f0,2,c))		return;	rn = rate2num(r>>1);	if(audio_fit_cap_helper(ai,rn,f0,2,c))		return;	rn = rate2num(r>>2);	if(audio_fit_cap_helper(ai,rn,f0,2,c))		return;	rn = rate2num(r>>0);	if(audio_fit_cap_helper(ai,rn,2,NUM_ENCODINGS,c))		return;	rn = rate2num(r>>1);	if(audio_fit_cap_helper(ai,rn,2,NUM_ENCODINGS,c))		return;	rn = rate2num(r>>2);	if(audio_fit_cap_helper(ai,rn,2,NUM_ENCODINGS,c))		return;        if(c == 1 && !param.force_stereo)		c = 0;        else if(c == 0 && !param.force_mono)                c = 1;        rn = rate2num(r>>0);        if(audio_fit_cap_helper(ai,rn,f0,2,c))                return;        rn = rate2num(r>>1);        if(audio_fit_cap_helper(ai,rn,f0,2,c))                return;        rn = rate2num(r>>2);        if(audio_fit_cap_helper(ai,rn,f0,2,c))                return;        rn = rate2num(r>>0);        if(audio_fit_cap_helper(ai,rn,2,NUM_ENCODINGS,c))                return;        rn = rate2num(r>>1);        if(audio_fit_cap_helper(ai,rn,2,NUM_ENCODINGS,c))                return;        rn = rate2num(r>>2);        if(audio_fit_cap_helper(ai,rn,2,NUM_ENCODINGS,c))                return;	fprintf(stderr,"No supported rate found!\n");	exit(1);}char *audio_encoding_name(int format){	int i;	for(i=0;i<NUM_ENCODINGS;i++) {		if(audio_val2name[i].val == format)			return audio_val2name[i].name;	}	return "Unknown";}