Add rudimentary file input

No nonblock support yet

1 files changed, 227 insertions, 0 deletions

diff --git a/src/input/File.cpp b/src/input/File.cpp
new file mode 100644
index 0000000..9721b97
--- /dev/null
+++ b/src/input/File.cpp
@@ -0,0 +1,227 @@
+/*
+   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(void* buffer, int 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 < 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) {
+        char buffer[4];
+
+        if (readFrame(buffer, 4) == 0) {
+            bitrate = getMpegBitrate(buffer);
+        }
+        else {
+            bitrate = -1;
+        }
+        rewind();
+    }
+    return bitrate;
+}
+
+
+int DABPlusFile::readFrame(void* buffer, int size)
+{
+    uint8_t* dataOut = reinterpret_cast<uint8_t*>(buffer);
+
+    ssize_t ret = read(m_fd, dataOut, size);
+
+    if (ret == -1) {
+        etiLog.log(alert, "ERROR: Can't read file\n");
+        perror("");
+        return -1;
+    }
+
+    if (ret < 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, dataOut + sizeOut, size - sizeOut);
+        if (ret == -1) {
+            etiLog.log(alert, "ERROR: Can't read file\n");
+            perror("");
+            return -1;
+        }
+
+        if (ret < size) {
+            etiLog.log(alert, "ERROR: Not enough data in file\n");
+            return -1;
+        }
+    }
+
+    return size;
+}
+
+int DABPlusFile::setBitrate(int bitrate)
+{
+    if (bitrate <= 0) {
+        etiLog.log(error, "Invalid bitrate (%i)\n", bitrate);
+        return -1;
+    }
+
+    return bitrate;
+}
+
+};