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/*
Copyright (C) 2009 Her Majesty the Queen in Right of Canada (Communications
Research Center Canada)
Copyright (C) 2016 Matthias P. Braendli
http://www.opendigitalradio.org
*/
/*
This file is part of ODR-DabMux.
ODR-DabMux 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-DabMux 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-DabMux. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sstream>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#ifndef _WIN32
# define O_BINARY 0
#endif
#include "input/File.h"
#include "mpeg.h"
namespace Inputs {
int FileBase::open(const std::string& name)
{
m_fd = ::open(name.c_str(), O_RDONLY | O_BINARY);
if (m_fd == -1) {
std::stringstream ss;
ss << "Could not open input file " << name << ": " <<
strerror(errno);
throw std::runtime_error(ss.str());
}
return 0;
}
int FileBase::close()
{
if (m_fd != -1) {
::close(m_fd);
m_fd = -1;
}
return 0;
}
int FileBase::rewind()
{
return ::lseek(m_fd, 0, SEEK_SET);
}
int MPEGFile::readFrame(uint8_t* buffer, size_t size)
{
int result;
bool do_rewind = false;
READ_SUBCHANNEL:
if (m_parity) {
result = readData(m_fd, buffer, size, 2);
m_parity = false;
return 0;
} else {
result = readMpegHeader(m_fd, buffer, size);
if (result > 0) {
result = readMpegFrame(m_fd, buffer, size);
if (result < 0 && getMpegFrequency(buffer) == 24000) {
m_parity = true;
result = size;
}
}
}
switch (result) {
case MPEG_BUFFER_UNDERFLOW:
etiLog.log(warn, "data underflow -> frame muted\n");
goto MUTE_SUBCHANNEL;
case MPEG_BUFFER_OVERFLOW:
etiLog.log(warn, "bitrate too high -> frame muted\n");
goto MUTE_SUBCHANNEL;
case MPEG_FILE_EMPTY:
if (do_rewind) {
etiLog.log(error, "file rewinded and still empty "
"-> frame muted\n");
goto MUTE_SUBCHANNEL;
}
else {
etiLog.log(info, "reach end of file -> rewinding\n");
rewind();
goto READ_SUBCHANNEL;
}
case MPEG_FILE_ERROR:
etiLog.log(alert, "can't read file (%i) -> frame muted\n", errno);
perror("");
goto MUTE_SUBCHANNEL;
case MPEG_SYNC_NOT_FOUND:
etiLog.log(alert, "mpeg sync not found, maybe is not a valid file "
"-> frame muted\n");
goto MUTE_SUBCHANNEL;
case MPEG_INVALID_FRAME:
etiLog.log(alert, "file is not a valid mpeg file "
"-> frame muted\n");
goto MUTE_SUBCHANNEL;
default:
if (result < 0) {
etiLog.log(alert,
"unknown error (code = %i) -> frame muted\n",
result);
MUTE_SUBCHANNEL:
memset(buffer, 0, size);
}
else {
if (result < (ssize_t)size) {
etiLog.log(warn, "bitrate too low from file "
"-> frame padded\n");
memset((char*)buffer + result, 0, size - result);
}
result = checkDabMpegFrame(buffer);
switch (result) {
case MPEG_FREQUENCY:
etiLog.log(error, "file has a frame with an invalid "
"frequency: %i, should be 48000 or 24000\n",
getMpegFrequency(buffer));
break;
case MPEG_PADDING:
etiLog.log(warn,
"file has a frame with padding bit set\n");
break;
case MPEG_COPYRIGHT:
result = 0;
break;
case MPEG_ORIGINAL:
result = 0;
break;
case MPEG_EMPHASIS:
etiLog.log(warn,
"file has a frame with emphasis bits set\n");
break;
default:
if (result < 0) {
etiLog.log(alert, "mpeg file has an invalid DAB "
"mpeg frame (unknown reason: %i)\n", result);
}
break;
}
}
}
return result;
}
int MPEGFile::setBitrate(int bitrate)
{
if (bitrate == 0) {
uint8_t buffer[4];
if (readFrame(buffer, 4) == 0) {
bitrate = getMpegBitrate(buffer);
}
else {
bitrate = -1;
}
rewind();
}
return bitrate;
}
int RawFile::readFrame(uint8_t* buffer, size_t size)
{
ssize_t ret = read(m_fd, buffer, size);
if (ret == -1) {
etiLog.log(alert, "ERROR: Can't read file\n");
perror("");
return -1;
}
if (ret < (ssize_t)size) {
ssize_t sizeOut = ret;
etiLog.log(info, "reach end of file -> rewinding\n");
if (rewind() == -1) {
etiLog.log(alert, "ERROR: Can't rewind file\n");
return -1;
}
ret = read(m_fd, buffer + sizeOut, size - sizeOut);
if (ret == -1) {
etiLog.log(alert, "ERROR: Can't read file\n");
perror("");
return -1;
}
if (ret < (ssize_t)size) {
etiLog.log(alert, "ERROR: Not enough data in file\n");
return -1;
}
}
return size;
}
int RawFile::setBitrate(int bitrate)
{
if (bitrate <= 0) {
etiLog.log(error, "Invalid bitrate (%i)\n", bitrate);
return -1;
}
return bitrate;
}
};
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