File: DBAudio_Get_Bufsize.c

package info (click to toggle)
dbmix 0.9.8-6.3
  • links: PTS
  • area: main
  • in suites: bullseye, buster, jessie, jessie-kfreebsd, sid, stretch
  • size: 2,896 kB
  • sloc: ansic: 12,309; sh: 11,418; makefile: 153
file content (137 lines) | stat: -rw-r--r-- 3,538 bytes parent folder | download | duplicates (6)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/*

  Author:  Bob Dean
  Copyright (c) 1999, 2000


   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public Licensse 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.

 */

#ifdef __cplusplus
extern "C"
{
#endif

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <limits.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <sys/shm.h>
#include <glib.h>
#include <math.h>
#include <dbsoundcard.h>
#include <dbchannel.h>
#include <dbdebug.h>
#include <dbaudiolib.h>

#include "prototypes.h"

	/* variables to access DBMix channels shared memory */
	extern  int shmid, sysshmid;
	extern dbfsd_data * sysdata;
	extern local_channel * local_channels;
	/* static local_channel * cue_channels; */
	extern local_channel * ch;
	
	extern int debug_level; /* declared in debug module */
	
	extern float local_pitch;

	extern int num_channels;
	extern int format;

	/*
	  DBAudio_Get_Bufsize - 
	 */

	int DBAudio_Get_Bufsize(int input_bufsize)
	{
		int format_multiplier;
		int stereo_multiplier;
	    int output_bufsize, difference;
		float bufsize;
		
		errno = ERROR_NOT_IMPLEMENTED;
		return FAILURE;

		if(ch == NULL) {errno = ERROR_NOT_INITIALIZED; return FAILURE;}
		
		if(input_bufsize == 0) {input_bufsize = PIPE_BUF;}
		
		local_pitch = (ch->base_pitch / 100.0) * (ch->user_pitch / 100.0);
		
		switch(num_channels)
		{
		case 1: stereo_multiplier = 2; break;
		case 2: stereo_multiplier = 1; break;
		default: errno = ERROR_BAD_NUMCH; return FAILURE;
		}
		
		switch(format)
		{
		case AFMT_U8: format_multiplier = 2; break;
		case AFMT_S8: format_multiplier = 2; break;
		case AFMT_S16_LE: format_multiplier = 1; break;
		case AFMT_S16_BE: format_multiplier = 1; break;
		default: errno = ERROR_BAD_FORMAT; return FAILURE;
		}
		
		
		
		bufsize = ((float) input_bufsize * (float) stereo_multiplier 
				   * (float)format_multiplier) / local_pitch;
		output_bufsize = ceil(bufsize);
		
/* 		printf("bufsize si %f\n",bufsize); */

		/* check to see if there is too much data to fit in the output buffer */
		if(output_bufsize > OUTPUT_BUFSIZE)
		{
			difference = (int)ceil(((float)(output_bufsize - OUTPUT_BUFSIZE) * local_pitch) 
								   / (float)(stereo_multiplier * format_multiplier));
			
			printf("too much data. difference is %d suggested is %d\n",difference,input_bufsize - difference);
			
			return input_bufsize - difference;
		}

		/* check to see if there is too little data for dbfsd to handle*/
		if(local_pitch > 1.0)
		{
			if(output_bufsize < PIPE_BUF)
			{
				difference = (int)ceil(((float)(PIPE_BUF - output_bufsize) * local_pitch) 
							  / (float)(stereo_multiplier * format_multiplier));
			  
				printf("%d is too little data. difference is %d suggested is %d\n",input_bufsize,difference,input_bufsize + difference);

				return input_bufsize + difference;
			}
		}

		return input_bufsize;
	}



#ifdef __cplusplus
}
#endif