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/*
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
Her Majesty the Queen in Right of Canada (Communications Research
Center Canada)
Copyrigth (C) 2014
Matthias P. Braendli, matthias.braendli@mpb.li
Taken from ODR-DabMod
Supported file formats: RAW, FRAMED, STREAMED
Supports re-sync to RAW ETI file
*/
/*
This file is part of ODR-DabMod.
ODR-DabMod 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 3 of the
License, or (at your option) any later version.
ODR-DabMod 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 ODR-DabMod. If not, see <http://www.gnu.org/licenses/>.
*/
#include "etiinput.hpp"
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h> /* Definition of AT_* constants */
#include <sys/stat.h>
int identify_eti_format(FILE* inputFile, int *streamType)
{
*streamType = ETI_STREAM_TYPE_NONE;
struct stat inputFileStat;
fstat(fileno(inputFile), &inputFileStat);
size_t inputfilelength_ = inputFileStat.st_size;
int nbframes_;
uint32_t sync;
uint32_t nbFrames;
uint16_t frameSize;
char discard_buffer[6144];
if (fread(&sync, sizeof(sync), 1, inputFile) != 1) {
fprintf(stderr, "Unable to read sync in input file!\n");
perror("");
return -1;
}
if ((sync == 0x49c5f8ff) || (sync == 0xb63a07ff)) {
*streamType = ETI_STREAM_TYPE_RAW;
if (inputfilelength_ > 0) {
nbframes_ = inputfilelength_ / 6144;
}
else {
nbframes_ = ~0;
}
if (fseek(inputFile, -sizeof(sync), SEEK_CUR) != 0) {
// if the seek fails, consume the rest of the frame
if (fread(discard_buffer, 6144 - sizeof(sync), 1, inputFile)
!= 1) {
fprintf(stderr, "Unable to read from input file!\n");
perror("");
return -1;
}
}
return 0;
}
nbFrames = sync;
if (fread(&frameSize, sizeof(frameSize), 1, inputFile) != 1) {
fprintf(stderr, "Unable to read frame size in input file!\n");
perror("");
return -1;
}
sync >>= 16;
sync &= 0xffff;
sync |= ((uint32_t)frameSize) << 16;
if ((sync == 0x49c5f8ff) || (sync == 0xb63a07ff)) {
*streamType = ETI_STREAM_TYPE_STREAMED;
frameSize = nbFrames & 0xffff;
if (inputfilelength_ > 0) {
nbframes_ = inputfilelength_ / (frameSize + 2);
}
else {
nbframes_ = ~0;
}
if (fseek(inputFile, -6, SEEK_CUR) != 0) {
// if the seek fails, consume the rest of the frame
if (fread(discard_buffer, frameSize - 4, 1, inputFile)
!= 1) {
fprintf(stderr, "Unable to read from input file!\n");
perror("");
return -1;
}
}
return 0;
}
if (fread(&sync, sizeof(sync), 1, inputFile) != 1) {
fprintf(stderr, "Unable to read nb frame in input file!\n");
perror("");
return -1;
}
if ((sync == 0x49c5f8ff) || (sync == 0xb63a07ff)) {
*streamType = ETI_STREAM_TYPE_FRAMED;
if (fseek(inputFile, -6, SEEK_CUR) != 0) {
// if the seek fails, consume the rest of the frame
if (fread(discard_buffer, frameSize - 4, 1, inputFile)
!= 1) {
fprintf(stderr, "Unable to read from input file!\n");
perror("");
return -1;
}
}
nbframes_ = ~0;
return 0;
}
// Search for the sync marker byte by byte
for (size_t i = 10; i < 6144 + 10; ++i) {
sync >>= 8;
sync &= 0xffffff;
if (fread((uint8_t*)&sync + 3, 1, 1, inputFile) != 1) {
fprintf(stderr, "Unable to read from input file!\n");
perror("");
return -1;
}
if ((sync == 0x49c5f8ff) || (sync == 0xb63a07ff)) {
*streamType = ETI_STREAM_TYPE_RAW;
if (inputfilelength_ > 0) {
nbframes_ = (inputfilelength_ - i) / 6144;
}
else {
nbframes_ = ~0;
}
if (fseek(inputFile, -sizeof(sync), SEEK_CUR) != 0) {
if (fread(discard_buffer, 6144 - sizeof(sync), 1, inputFile)
!= 1) {
fprintf(stderr, "Unable to read from input file!\n");
perror("");
return -1;
}
}
return 0;
}
}
(void)nbframes_; // suppress warning "nbframes_ unused"
fprintf(stderr, "Bad input file format!\n");
return -1;
}
int get_eti_frame(FILE* inputfile, int stream_type, void* buf)
{
// Initialise buffer
memset(buf, 0x55, 6144);
uint16_t frameSize;
if (stream_type == ETI_STREAM_TYPE_RAW) {
frameSize = 6144;
}
else {
if (fread(&frameSize, sizeof(frameSize), 1, inputfile) != 1) {
// EOF
return 0;
}
}
if (frameSize > 6144) { // there might be a better limit
fprintf(stderr, "Wrong frame size %u in ETI file!\n", frameSize);
return -1;
}
int read_bytes = fread(buf, 1, frameSize, inputfile);
if (read_bytes != frameSize) {
// A short read of a frame (i.e. reading an incomplete frame)
// is not tolerated. Input files must not contain incomplete frames
fprintf(stderr, "Incomplete frame in ETI file!\n");
return -1;
}
// We have added padding, so we always return 6144 bytes
return 6144;
}
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