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-rw-r--r--src/dabInputPacketFile.cpp263
1 files changed, 263 insertions, 0 deletions
diff --git a/src/dabInputPacketFile.cpp b/src/dabInputPacketFile.cpp
new file mode 100644
index 0000000..65b5ebe
--- /dev/null
+++ b/src/dabInputPacketFile.cpp
@@ -0,0 +1,263 @@
+/*
+ Copyright (C) 2009, 2011 Her Majesty the Queen in Right of Canada
+ (Communications Research Center Canada)
+ */
+/*
+ This file is part of CRC-DabMux.
+
+ CRC-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.
+
+ CRC-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 CRC-DabMux. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "dabInputPacketFile.h"
+#include "dabInputFile.h"
+#include "dabInputFifo.h"
+#include "ReedSolomon.h"
+
+#ifdef HAVE_FORMAT_PACKET
+# ifdef HAVE_INPUT_FILE
+
+
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+
+#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
+;
+
+
+struct dabInputOperations dabInputPacketFileOperations = {
+ dabInputFileInit,
+ dabInputFileOpen,
+ dabInputSetbuf,
+ dabInputFileRead,
+ NULL,
+ NULL,
+ dabInputPacketFileRead,
+ dabInputSetbitrate,
+ dabInputFileClose,
+ dabInputFileClean,
+ dabInputFileRewind
+};
+
+
+int dabInputPacketFileRead(dabInputOperations* ops, void* args, void* buffer,
+ int size)
+{
+ dabInputFileData* data = (dabInputFileData*)args;
+ unsigned char* dataBuffer = (unsigned char*)buffer;
+ int written = 0;
+ int length;
+ packetHeader* header;
+ int indexRow;
+ int indexCol;
+
+ while (written < size) {
+ if (data->enhancedPacketWaiting > 0) {
+ *dataBuffer = 192 - data->enhancedPacketWaiting;
+ *dataBuffer /= 22;
+ *dataBuffer <<= 2;
+ *(dataBuffer++) |= 0x03;
+ *(dataBuffer++) = 0xfe;
+ indexCol = 188;
+ indexCol += (192 - data->enhancedPacketWaiting) / 12;
+ indexRow = 0;
+ indexRow += (192 - data->enhancedPacketWaiting) % 12;
+ for (int j = 0; j < 22; ++j) {
+ if (data->enhancedPacketWaiting == 0) {
+ *(dataBuffer++) = 0;
+ } else {
+ *(dataBuffer++) = data->enhancedPacketData[indexRow][indexCol];
+ if (++indexRow == 12) {
+ indexRow = 0;
+ ++indexCol;
+ }
+ --data->enhancedPacketWaiting;
+ }
+ }
+ written += 24;
+ if (data->enhancedPacketWaiting == 0) {
+ data->enhancedPacketLength = 0;
+ }
+ } else if (data->packetLength != 0) {
+ header = (packetHeader*)data->packetData;
+ if (written + data->packetLength > (unsigned)size) {
+ memset(dataBuffer, 0, 22);
+ dataBuffer[22] = 0x60;
+ dataBuffer[23] = 0x4b;
+ length = 24;
+ } else if (data->enhancedPacketData != NULL) {
+ if (data->enhancedPacketLength + data->packetLength
+ > (12 * 188)) {
+ memset(dataBuffer, 0, 22);
+ dataBuffer[22] = 0x60;
+ dataBuffer[23] = 0x4b;
+ length = 24;
+ } else {
+ memcpy(dataBuffer, data->packetData, data->packetLength);
+ length = data->packetLength;
+ data->packetLength = 0;
+ }
+ } else {
+ memcpy(dataBuffer, data->packetData, data->packetLength);
+ length = data->packetLength;
+ data->packetLength = 0;
+ }
+ if (data->enhancedPacketData != NULL) {
+ indexCol = data->enhancedPacketLength / 12;
+ indexRow = data->enhancedPacketLength % 12; // TODO Check if always 0
+ for (int j = 0; j < length; ++j) {
+ data->enhancedPacketData[indexRow][indexCol] = dataBuffer[j];
+ if (++indexRow == 12) {
+ indexRow = 0;
+ ++indexCol;
+ }
+ }
+ data->enhancedPacketLength += length;
+ if (data->enhancedPacketLength >= (12 * 188)) {
+ data->enhancedPacketLength = (12 * 188);
+ ReedSolomon encoder(204, 188);
+ for (int j = 0; j < 12; ++j) {
+ encoder.encode(data->enhancedPacketData[j], 188);
+ }
+ data->enhancedPacketWaiting = 192;
+ }
+ }
+ written += length;
+ dataBuffer += length;
+ } else {
+ int nbBytes = ops->read(args, dataBuffer, 3);
+ header = (packetHeader*)dataBuffer;
+ if (nbBytes == -1) {
+ if (errno == EAGAIN) goto END_PACKET;
+ perror("Packet file");
+ return -1;
+ } else if (nbBytes == 0) {
+ if (ops->rewind(args) == -1) {
+ goto END_PACKET;
+ }
+ continue;
+ } else if (nbBytes < 3) {
+ etiLog.print(TcpLog::ERR,
+ "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(data->packetData, header, 3);
+ ops->read(args, &data->packetData[3], length - 3);
+ data->packetLength = length;
+ continue;
+ }
+ if (data->enhancedPacketData != NULL) {
+ if (data->enhancedPacketLength + length > (12 * 188)) {
+ memcpy(data->packetData, header, 3);
+ ops->read(args, &data->packetData[3], length - 3);
+ data->packetLength = length;
+ continue;
+ }
+ }
+ nbBytes = ops->read(args, dataBuffer + 3, length - 3);
+ if (nbBytes == -1) {
+ perror("Packet file");
+ return -1;
+ } else if (nbBytes == 0) {
+ etiLog.print(TcpLog::NOTICE,
+ "Packet header read, but no data!\n");
+ if (ops->rewind(args) == -1) {
+ goto END_PACKET;
+ }
+ continue;
+ } else if (nbBytes < length - 3) {
+ etiLog.print(TcpLog::ERR, "Error while reading packet file; "
+ "read %i out of %i bytes\n", nbBytes, length - 3);
+ break;
+ }
+ if (data->enhancedPacketData != NULL) {
+ indexCol = data->enhancedPacketLength / 12;
+ indexRow = data->enhancedPacketLength % 12; // TODO Check if always 0
+ for (int j = 0; j < length; ++j) {
+ data->enhancedPacketData[indexRow][indexCol] = dataBuffer[j];
+ if (++indexRow == 12) {
+ indexRow = 0;
+ ++indexCol;
+ }
+ }
+ data->enhancedPacketLength += length;
+ if (data->enhancedPacketLength >= (12 * 188)) {
+ if (data->enhancedPacketLength > (12 * 188)) {
+ etiLog.print(TcpLog::ERR,
+ "Error, too much enhanced packet data!\n");
+ }
+ ReedSolomon encoder(204, 188);
+ for (int j = 0; j < 12; ++j) {
+ encoder.encode(data->enhancedPacketData[j], 188);
+ }
+ data->enhancedPacketWaiting = 192;
+ }
+ }
+ written += length;
+ dataBuffer += length;
+ }
+ }
+END_PACKET:
+ if (ops->read == dabInputFifoRead) {
+ dabInputFifoData* fifoData = (dabInputFifoData*)args;
+ dabInputFifoStats* fifoStats = (dabInputFifoStats*)&fifoData->stats;
+ fifoStats->frameRecords[fifoStats->frameCount].curSize = written;
+ fifoStats->frameRecords[fifoStats->frameCount].maxSize = size;
+ if (++fifoStats->frameCount == NB_RECORDS) {
+ etiLog.print(TcpLog::INFO, "Packet subchannel usage: (%i)",
+ fifoStats->id);
+ for (int i = 0; i < fifoStats->frameCount; ++i) {
+ etiLog.print(TcpLog::INFO, " %i/%i",
+ fifoStats->frameRecords[i].curSize,
+ fifoStats->frameRecords[i].maxSize);
+ }
+ etiLog.print(TcpLog::INFO, "\n");
+ fifoStats->frameCount = 0;
+ }
+ }
+ while (written < size) {
+ memset(dataBuffer, 0, 22);
+ dataBuffer[22] = 0x60;
+ dataBuffer[23] = 0x4b;
+ dataBuffer += 24;
+ written += 24;
+ }
+ return written;
+}
+
+
+# endif
+#endif
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