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-rw-r--r--src/input/File.cpp443
1 files changed, 443 insertions, 0 deletions
diff --git a/src/input/File.cpp b/src/input/File.cpp
new file mode 100644
index 0000000..5c61fd4
--- /dev/null
+++ b/src/input/File.cpp
@@ -0,0 +1,443 @@
+/*
+ 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"
+#include "ReedSolomon.h"
+
+namespace Inputs {
+
+#ifdef _WIN32
+# pragma pack(push, 1)
+#endif
+struct packetHeader {
+ unsigned char addressHigh:2;
+ unsigned char last:1;
+ unsigned char first:1;
+ unsigned char continuityIndex:2;
+ unsigned char packetLength:2;
+ unsigned char addressLow;
+ unsigned char dataLength:7;
+ unsigned char command;
+}
+#ifdef _WIN32
+# pragma pack(pop)
+#else
+__attribute((packed))
+#endif
+;
+
+
+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::setBitrate(int bitrate)
+{
+ if (bitrate <= 0) {
+ etiLog.log(error, "Invalid bitrate (%i)\n", bitrate);
+ return -1;
+ }
+
+ return bitrate;
+}
+
+
+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);
+}
+
+ssize_t FileBase::readFromFile(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 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)
+{
+ return readFromFile(buffer, size);
+}
+
+PacketFile::PacketFile(bool enhancedPacketMode)
+{
+ m_enhancedPacketEnabled = enhancedPacketMode;
+}
+
+int PacketFile::readFrame(uint8_t* buffer, size_t size)
+{
+ size_t written = 0;
+ int length;
+ packetHeader* header;
+ int indexRow;
+ int indexCol;
+
+ while (written < size) {
+ if (m_enhancedPacketWaiting > 0) {
+ *buffer = 192 - m_enhancedPacketWaiting;
+ *buffer /= 22;
+ *buffer <<= 2;
+ *(buffer++) |= 0x03;
+ *(buffer++) = 0xfe;
+ indexCol = 188;
+ indexCol += (192 - m_enhancedPacketWaiting) / 12;
+ indexRow = 0;
+ indexRow += (192 - m_enhancedPacketWaiting) % 12;
+ for (int j = 0; j < 22; ++j) {
+ if (m_enhancedPacketWaiting == 0) {
+ *(buffer++) = 0;
+ }
+ else {
+ *(buffer++) = m_enhancedPacketData[indexRow][indexCol];
+ if (++indexRow == 12) {
+ indexRow = 0;
+ ++indexCol;
+ }
+ --m_enhancedPacketWaiting;
+ }
+ }
+ written += 24;
+ if (m_enhancedPacketWaiting == 0) {
+ m_enhancedPacketLength = 0;
+ }
+ }
+ else if (m_packetLength != 0) {
+ header = (packetHeader*)(&m_packetData[0]);
+ if (written + m_packetLength > (unsigned)size) {
+ memset(buffer, 0, 22);
+ buffer[22] = 0x60;
+ buffer[23] = 0x4b;
+ length = 24;
+ }
+ else if (m_enhancedPacketEnabled) {
+ if (m_enhancedPacketLength + m_packetLength > (12 * 188)) {
+ memset(buffer, 0, 22);
+ buffer[22] = 0x60;
+ buffer[23] = 0x4b;
+ length = 24;
+ }
+ else {
+ std::copy(m_packetData.begin(),
+ m_packetData.begin() + m_packetLength,
+ buffer);
+ length = m_packetLength;
+ m_packetLength = 0;
+ }
+ }
+ else {
+ std::copy(m_packetData.begin(),
+ m_packetData.begin() + m_packetLength,
+ buffer);
+ length = m_packetLength;
+ m_packetLength = 0;
+ }
+
+ if (m_enhancedPacketEnabled) {
+ indexCol = m_enhancedPacketLength / 12;
+ indexRow = m_enhancedPacketLength % 12; // TODO Check if always 0
+ for (int j = 0; j < length; ++j) {
+ m_enhancedPacketData[indexRow][indexCol] = buffer[j];
+ if (++indexRow == 12) {
+ indexRow = 0;
+ ++indexCol;
+ }
+ }
+ m_enhancedPacketLength += length;
+ if (m_enhancedPacketLength >= (12 * 188)) {
+ m_enhancedPacketLength = (12 * 188);
+ ReedSolomon encoder(204, 188);
+ for (int j = 0; j < 12; ++j) {
+ encoder.encode(&m_enhancedPacketData[j][0], 188);
+ }
+ m_enhancedPacketWaiting = 192;
+ }
+ }
+ written += length;
+ buffer += length;
+ }
+ else {
+ int nbBytes = readFromFile(buffer, 3);
+ header = (packetHeader*)buffer;
+ if (nbBytes == -1) {
+ if (errno == EAGAIN) goto END_PACKET;
+ perror("Packet file");
+ return -1;
+ }
+ else if (nbBytes == 0) {
+ if (rewind() == -1) {
+ goto END_PACKET;
+ }
+ continue;
+ }
+ else if (nbBytes < 3) {
+ etiLog.log(error,
+ "Error while reading file for packet header; "
+ "read %i out of 3 bytes\n", nbBytes);
+ break;
+ }
+
+ length = header->packetLength * 24 + 24;
+ if (written + length > size) {
+ memcpy(&m_packetData[0], header, 3);
+ readFromFile(&m_packetData[3], length - 3);
+ m_packetLength = length;
+ continue;
+ }
+
+ if (m_enhancedPacketEnabled) {
+ if (m_enhancedPacketLength + length > (12 * 188)) {
+ memcpy(&m_packetData[0], header, 3);
+ readFromFile(&m_packetData[3], length - 3);
+ m_packetLength = length;
+ continue;
+ }
+ }
+
+ nbBytes = readFromFile(buffer + 3, length - 3);
+ if (nbBytes == -1) {
+ perror("Packet file");
+ return -1;
+ }
+ else if (nbBytes == 0) {
+ etiLog.log(info,
+ "Packet header read, but no data!\n");
+ if (rewind() == -1) {
+ goto END_PACKET;
+ }
+ continue;
+ }
+ else if (nbBytes < length - 3) {
+ etiLog.log(error, "Error while reading packet file; "
+ "read %i out of %i bytes\n", nbBytes, length - 3);
+ break;
+ }
+
+ if (m_enhancedPacketEnabled) {
+ indexCol = m_enhancedPacketLength / 12;
+ indexRow = m_enhancedPacketLength % 12; // TODO Check if always 0
+ for (int j = 0; j < length; ++j) {
+ m_enhancedPacketData[indexRow][indexCol] = buffer[j];
+ if (++indexRow == 12) {
+ indexRow = 0;
+ ++indexCol;
+ }
+ }
+ m_enhancedPacketLength += length;
+ if (m_enhancedPacketLength >= (12 * 188)) {
+ if (m_enhancedPacketLength > (12 * 188)) {
+ etiLog.log(error,
+ "Error, too much enhanced packet data!\n");
+ }
+ ReedSolomon encoder(204, 188);
+ for (int j = 0; j < 12; ++j) {
+ encoder.encode(&m_enhancedPacketData[j][0], 188);
+ }
+ m_enhancedPacketWaiting = 192;
+ }
+ }
+ written += length;
+ buffer += length;
+ }
+ }
+END_PACKET:
+ while (written < size) {
+ memset(buffer, 0, 22);
+ buffer[22] = 0x60;
+ buffer[23] = 0x4b;
+ buffer += 24;
+ written += 24;
+ }
+ return written;
+}
+
+};
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