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/*
* sounddecoder.cpp
*
* This file is part of AISDecoder.
*
* Copyright (C) 2013
* Astra Paging Ltd / AISHub (info@aishub.net)
*
* AISDecoder 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.
*
* AISDecoder uses parts of GNUAIS project (http://gnuais.sourceforge.net/)
*
*/
#include <string.h>
#include <stdio.h>
//#include "config.h"
#ifdef WIN32
#include <fcntl.h>
#endif
#include "lib/receiver.h"
#include "lib/hmalloc.h"
#define MAX_FILENAME_SIZE 512
#define ERROR_MESSAGE_LENGTH 1024
#include "sounddecoder.h"
char errorSoundDecoder[ERROR_MESSAGE_LENGTH];
static struct receiver *rx_a=NULL;
static struct receiver *rx_b=NULL;
static short *buffer=NULL;
static int buffer_l=0;
static int buffer_read=0;
static int channels=0;
static Sound_Channels sound_channels;
static FILE *fp=NULL;
static void readBuffers();
static time_t tprev=0;
static int time_print_stats=0;
int initSoundDecoder(int buf_len,int _time_print_stats, int add_sample_num)
{
sound_channels=SOUND_CHANNELS_STEREO;
channels = sound_channels == SOUND_CHANNELS_MONO ? 1 : 2;
time_print_stats=_time_print_stats;
tprev=time(NULL); // for decoder statistics
buffer = (short *) hmalloc(channels*sizeof(short)*buf_len);
rx_a = init_receiver('A', 2, 0, add_sample_num);
rx_b = init_receiver('B', 2, 1, add_sample_num);
return 1;
}
void run_mem_decoder(short * buf, int len,int max_buf_len)
{
int offset=0;
int bytes_in_len=len*channels;
char * p=(char *) buf;
while(bytes_in_len > max_buf_len )
{
memcpy(buffer,p+offset,max_buf_len);
buffer_read=max_buf_len/(channels*sizeof(short));
bytes_in_len-=max_buf_len;
offset+=max_buf_len;
readBuffers();
}
memcpy(buffer,p+offset,bytes_in_len);
buffer_read=bytes_in_len/(channels*sizeof(short));
readBuffers();
if(time_print_stats && (time(NULL)-tprev >= time_print_stats))
{
struct demod_state_t *d = rx_a->decoder;
tprev=time(NULL);
fprintf(stderr,
"A: Received correctly: %d packets, wrong CRC: %d packets, wrong size: %d packets\n",
d->receivedframes, d->lostframes,
d->lostframes2);
d = rx_b->decoder;
fprintf(stderr,
"B: Received correctly: %d packets, wrong CRC: %d packets, wrong size: %d packets\n",
d->receivedframes, d->lostframes,
d->lostframes2);
}
}
void runSoundDecoder(int *stop) {
while (!*stop) {
buffer_read = fread(buffer, channels * sizeof(short), buffer_l, fp);
readBuffers();
}
}
static void readBuffers() {
if (buffer_read <= 0) return;
if (rx_a != NULL && sound_channels != SOUND_CHANNELS_RIGHT)
receiver_run(rx_a, buffer, buffer_read);
if (rx_b != NULL &&
(sound_channels == SOUND_CHANNELS_STEREO || sound_channels == SOUND_CHANNELS_RIGHT)
) receiver_run(rx_b, buffer, buffer_read);
}
void freeSoundDecoder(void) {
if (fp != NULL) {
fclose(fp);
fp=NULL;
}
if (rx_a != NULL) {
free_receiver(rx_a);
rx_a=NULL;
}
if (rx_b != NULL) {
free_receiver(rx_b);
rx_b=NULL;
}
if (buffer != NULL) {
hfree(buffer);
buffer = NULL;
}
}
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