diff options
Diffstat (limited to 'src/input/File.cpp')
| -rw-r--r-- | src/input/File.cpp | 227 |
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; +} + +}; |