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      1 /*
      2  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #include <stdlib.h>
     12 #include <stdio.h>
     13 #include <string.h>
     14 #include <math.h>
     15 #include "utility.h"
     16 
     17 /* function for reading audio data from PCM file */
     18 int
     19 readframe(
     20     short* data,
     21     FILE*  inp,
     22     int    length)
     23 {
     24     short k, rlen, status = 0;
     25 	unsigned char* ptrUChar;
     26 	ptrUChar = (unsigned char*)data;
     27 
     28     rlen = (short)fread(data, sizeof(short), length, inp);
     29     if (rlen < length) {
     30         for (k = rlen; k < length; k++)
     31             data[k] = 0;
     32         status = 1;
     33     }
     34 
     35 	// Assuming that our PCM files are written in Intel machines
     36 	for(k = 0; k < length; k++)
     37 	{
     38 		data[k] = (short)ptrUChar[k<<1] | ((((short)ptrUChar[(k<<1) + 1]) << 8) & 0xFF00);
     39 	}
     40 
     41     return status;
     42 }
     43 
     44 short
     45 readSwitch(
     46     int   argc,
     47     char* argv[],
     48     char* strID)
     49 {
     50     short n;
     51     for(n = 0; n < argc; n++)
     52     {
     53         if(strcmp(argv[n], strID) == 0)
     54         {
     55             return 1;
     56         }
     57     }
     58     return 0;
     59 }
     60 
     61 double
     62 readParamDouble(
     63     int    argc,
     64     char*  argv[],
     65     char*  strID,
     66     double defaultVal)
     67 {
     68     double returnVal = defaultVal;
     69     short n;
     70     for(n = 0; n < argc; n++)
     71     {
     72         if(strcmp(argv[n], strID) == 0)
     73         {
     74             n++;
     75             if(n < argc)
     76             {
     77                 returnVal = atof(argv[n]);
     78             }
     79             break;
     80         }
     81     }
     82     return returnVal;
     83 }
     84 
     85 int
     86 readParamInt(
     87     int   argc,
     88     char* argv[],
     89     char* strID,
     90     int   defaultVal)
     91 {
     92     int returnVal = defaultVal;
     93     short n;
     94     for(n = 0; n < argc; n++)
     95     {
     96         if(strcmp(argv[n], strID) == 0)
     97         {
     98             n++;
     99             if(n < argc)
    100             {
    101                 returnVal = atoi(argv[n]);
    102             }
    103             break;
    104         }
    105     }
    106     return returnVal;
    107 }
    108 
    109 int
    110 readParamString(
    111     int   argc,
    112     char* argv[],
    113     char* strID,
    114     char* stringParam,
    115     int   maxSize)
    116 {
    117     int paramLenght = 0;
    118     short n;
    119     for(n = 0; n < argc; n++)
    120     {
    121         if(strcmp(argv[n], strID) == 0)
    122         {
    123             n++;
    124             if(n < argc)
    125             {
    126                 strncpy(stringParam, argv[n], maxSize);
    127                 paramLenght = (int)strlen(argv[n]);
    128             }
    129             break;
    130         }
    131     }
    132     return paramLenght;
    133 }
    134 
    135 void
    136 get_arrival_time(
    137     int              current_framesamples,   /* samples */
    138     int              packet_size,            /* bytes */
    139     int              bottleneck,             /* excluding headers; bits/s */
    140     BottleNeckModel* BN_data,
    141     short            senderSampFreqHz,
    142     short            receiverSampFreqHz)
    143 {
    144     unsigned int travelTimeMs;
    145 	const int headerSizeByte = 35;
    146 
    147 	int headerRate;
    148 
    149     BN_data->whenPackGeneratedMs += (current_framesamples / (senderSampFreqHz / 1000));
    150 
    151 	headerRate = headerSizeByte * 8 * senderSampFreqHz / current_framesamples;     /* bits/s */
    152 
    153 	/* everything in samples */
    154 	BN_data->sample_count = BN_data->sample_count + current_framesamples;
    155 
    156     //travelTimeMs = ((packet_size + HeaderSize) * 8 * sampFreqHz) /
    157     //    (bottleneck + HeaderRate)
    158     travelTimeMs = (unsigned int)floor((double)((packet_size + headerSizeByte) * 8 * 1000)
    159         / (double)(bottleneck + headerRate) + 0.5);
    160 
    161     if(BN_data->whenPrevPackLeftMs > BN_data->whenPackGeneratedMs)
    162     {
    163         BN_data->whenPrevPackLeftMs += travelTimeMs;
    164     }
    165     else
    166     {
    167         BN_data->whenPrevPackLeftMs = BN_data->whenPackGeneratedMs +
    168             travelTimeMs;
    169     }
    170 
    171     BN_data->arrival_time = (BN_data->whenPrevPackLeftMs *
    172         (receiverSampFreqHz / 1000));
    173 
    174 //	if (BN_data->arrival_time < BN_data->sample_count)
    175 //		BN_data->arrival_time = BN_data->sample_count;
    176 
    177 	BN_data->rtp_number++;
    178 }
    179