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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Original license header:
+ *
+ * Cabal - Legacy Game Implementations
+ *
+ * Cabal is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+// Enable all forbidden symbols to allow us to include and use necessary APIs.
+#define FORBIDDEN_SYMBOL_ALLOW_ALL
+
+#include "backends/audiocd/linux/linux-audiocd.h"
+
+#ifdef USE_LINUXCD
+
+#include "backends/audiocd/audiocd-stream.h"
+#include "backends/audiocd/default/default-audiocd.h"
+#include "common/array.h"
+#include "common/config-manager.h"
+#include "common/str.h"
+#include "common/debug.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <linux/cdrom.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+enum {
+ kLeadoutTrack = 0xAA
+};
+
+enum {
+ kBytesPerFrame = 2352,
+ kSamplesPerFrame = kBytesPerFrame / 2
+};
+
+enum {
+ kSecondsPerMinute = 60,
+ kFramesPerSecond = 75
+};
+
+enum {
+ // Keep about a second's worth of audio in the buffer
+ kBufferThreshold = kFramesPerSecond
+};
+
+static int getFrameCount(const cdrom_msf0 &msf) {
+ int time = msf.minute;
+ time *= kSecondsPerMinute;
+ time += msf.second;
+ time *= kFramesPerSecond;
+ time += msf.frame;
+ return time;
+}
+
+// Helper function to convert an error code into a human-readable message
+static Common::String getErrorMessage(int errorCode) {
+ char buf[256];
+ buf[0] = 0;
+
+#ifdef _GNU_SOURCE
+ // glibc sucks
+ return Common::String(strerror_r(errorCode, buf, sizeof(buf)));
+#else
+ strerror_r(errorCode, buf, sizeof(buf));
+ return Common::String(buf);
+#endif
+}
+
+class LinuxAudioCDStream : public AudioCDStream {
+public:
+ LinuxAudioCDStream(int fd, const cdrom_tocentry &startEntry, const cdrom_tocentry &endEntry);
+ ~LinuxAudioCDStream();
+
+protected:
+ uint getStartFrame() const;
+ uint getEndFrame() const;
+ bool readFrame(int frame, int16 *buffer);
+
+private:
+ int _fd;
+ const cdrom_tocentry &_startEntry, &_endEntry;
+};
+
+LinuxAudioCDStream::LinuxAudioCDStream(int fd, const cdrom_tocentry &startEntry, const cdrom_tocentry &endEntry) :
+ _fd(fd), _startEntry(startEntry), _endEntry(endEntry) {
+ // We fill the buffer here already to prevent any out of sync issues due
+ // to the CD not yet having spun up.
+ startTimer(true);
+}
+
+LinuxAudioCDStream::~LinuxAudioCDStream() {
+ stopTimer();
+}
+
+bool LinuxAudioCDStream::readFrame(int frame, int16 *buffer) {
+ // Create the argument
+ union {
+ cdrom_msf msf;
+ char buffer[kBytesPerFrame];
+ } arg;
+
+ int seconds = frame / kFramesPerSecond;
+ frame %= kFramesPerSecond;
+ int minutes = seconds / kSecondsPerMinute;
+ seconds %= kSecondsPerMinute;
+
+ // Request to read that frame
+ // We don't use CDROMREADAUDIO, as it seems to cause kernel
+ // panics on ejecting discs. Probably bad to eject the disc
+ // while playing, but at least let's try to prevent that case.
+ arg.msf.cdmsf_min0 = minutes;
+ arg.msf.cdmsf_sec0 = seconds;
+ arg.msf.cdmsf_frame0 = frame;
+ // The "end" part is irrelevant (why isn't cdrom_msf0 the type
+ // instead?)
+
+ if (ioctl(_fd, CDROMREADRAW, &arg) < 0) {
+ warning("Failed to CD read audio: %s", getErrorMessage(errno).c_str());
+ return false;
+ }
+
+ memcpy(buffer, arg.buffer, kBytesPerFrame);
+ return true;
+}
+
+uint LinuxAudioCDStream::getStartFrame() const {
+ return getFrameCount(_startEntry.cdte_addr.msf);
+}
+
+uint LinuxAudioCDStream::getEndFrame() const {
+ return getFrameCount(_endEntry.cdte_addr.msf);
+}
+
+
+class LinuxAudioCDManager : public DefaultAudioCDManager {
+public:
+ LinuxAudioCDManager();
+ ~LinuxAudioCDManager();
+
+ bool open();
+ void close();
+ bool play(int track, int numLoops, int startFrame, int duration, bool onlyEmulate = false);
+
+protected:
+ bool openCD(int drive);
+ bool openCD(const Common::String &drive);
+
+private:
+ struct Device {
+ Device(const Common::String &n, dev_t d) : name(n), device(d) {}
+ Common::String name;
+ dev_t device;
+ };
+
+ typedef Common::Array<Device> DeviceList;
+ DeviceList scanDevices();
+ bool tryAddDrive(DeviceList &devices, const Common::String &drive);
+ bool tryAddDrive(DeviceList &devices, const Common::String &drive, dev_t device);
+ bool tryAddDrive(DeviceList &devices, dev_t device);
+ bool tryAddPath(DeviceList &devices, const Common::String &path);
+ bool tryAddGamePath(DeviceList &devices);
+ bool loadTOC();
+ static bool hasDevice(const DeviceList &devices, dev_t device);
+
+ int _fd;
+ cdrom_tochdr _tocHeader;
+ Common::Array<cdrom_tocentry> _tocEntries;
+};
+
+static bool isTrayEmpty(int errorNumber) {
+ switch (errorNumber) {
+ case EIO:
+ case ENOENT:
+ case EINVAL:
+#ifdef ENOMEDIUM
+ case ENOMEDIUM:
+#endif
+ return true;
+ }
+
+ return false;
+}
+
+LinuxAudioCDManager::LinuxAudioCDManager() {
+ _fd = -1;
+ memset(&_tocHeader, 0, sizeof(_tocHeader));
+}
+
+LinuxAudioCDManager::~LinuxAudioCDManager() {
+ close();
+}
+
+bool LinuxAudioCDManager::open() {
+ close();
+
+ if (openRealCD())
+ return true;
+
+ return DefaultAudioCDManager::open();
+}
+
+void LinuxAudioCDManager::close() {
+ DefaultAudioCDManager::close();
+
+ if (_fd < 0)
+ return;
+
+ ::close(_fd);
+ memset(&_tocHeader, 0, sizeof(_tocHeader));
+ _tocEntries.clear();
+}
+
+bool LinuxAudioCDManager::openCD(int drive) {
+ DeviceList devices = scanDevices();
+ if (drive >= (int)devices.size())
+ return false;
+
+ _fd = ::open(devices[drive].name.c_str(), O_RDONLY | O_NONBLOCK, 0);
+ if (_fd < 0)
+ return false;
+
+ if (!loadTOC()) {
+ close();
+ return false;
+ }
+
+ return true;
+}
+
+bool LinuxAudioCDManager::openCD(const Common::String &drive) {
+ DeviceList devices;
+ if (!tryAddDrive(devices, drive) && !tryAddPath(devices, drive))
+ return false;
+
+ _fd = ::open(devices[0].name.c_str(), O_RDONLY | O_NONBLOCK, 0);
+ if (_fd < 0)
+ return false;
+
+ if (!loadTOC()) {
+ close();
+ return false;
+ }
+
+ return true;
+}
+
+bool LinuxAudioCDManager::play(int track, int numLoops, int startFrame, int duration, bool onlyEmulate) {
+ // Prefer emulation
+ if (DefaultAudioCDManager::play(track, numLoops, startFrame, duration, onlyEmulate))
+ return true;
+
+ // If we're set to only emulate, or have no CD drive, return here
+ if (onlyEmulate || _fd < 0)
+ return false;
+
+ // HACK: For now, just assume that track number is right
+ // That only works because ScummVM uses the wrong track number anyway
+
+ if (track >= (int)_tocEntries.size() - 1) {
+ warning("No such track %d", track);
+ return false;
+ }
+
+ // Bail if the track isn't an audio track
+ if ((_tocEntries[track].cdte_ctrl & 0x04) != 0) {
+ warning("Track %d is not audio", track);
+ return false;
+ }
+
+ // Create the AudioStream and play it
+ debug(1, "Playing CD track %d", track);
+
+ Audio::SeekableAudioStream *audioStream = new LinuxAudioCDStream(_fd, _tocEntries[track], _tocEntries[track + 1]);
+
+ Audio::Timestamp start = Audio::Timestamp(0, startFrame, 75);
+ Audio::Timestamp end = (duration == 0) ? audioStream->getLength() : Audio::Timestamp(0, startFrame + duration, 75);
+
+ // Fake emulation since we're really playing an AudioStream
+ _emulating = true;
+
+ _mixer->playStream(
+ Audio::Mixer::kMusicSoundType,
+ &_handle,
+ Audio::makeLoopingAudioStream(audioStream, start, end, (numLoops < 1) ? numLoops + 1 : numLoops),
+ -1,
+ _cd.volume,
+ _cd.balance,
+ DisposeAfterUse::YES,
+ true);
+
+ return true;
+}
+
+LinuxAudioCDManager::DeviceList LinuxAudioCDManager::scanDevices() {
+ DeviceList devices;
+
+ // Try to use the game's path first as the device
+ tryAddGamePath(devices);
+
+ // Try adding the default CD-ROM
+ tryAddDrive(devices, "/dev/cdrom");
+
+ // TODO: Try others?
+
+ return devices;
+}
+
+bool LinuxAudioCDManager::tryAddDrive(DeviceList &devices, const Common::String &drive) {
+ struct stat stbuf;
+ if (stat(drive.c_str(), &stbuf) < 0)
+ return false;
+
+ // Must be a character or block device
+ if (!S_ISCHR(stbuf.st_mode) && !S_ISBLK(stbuf.st_mode))
+ return false;
+
+ return tryAddDrive(devices, drive, stbuf.st_rdev);
+}
+
+bool LinuxAudioCDManager::tryAddDrive(DeviceList &devices, const Common::String &drive, dev_t device) {
+ if (hasDevice(devices, device))
+ return true;
+
+ // Try opening the device and seeing if it is a CD-ROM drve
+ int fd = ::open(drive.c_str(), O_RDONLY | O_NONBLOCK, 0);
+ if (fd >= 0) {
+ cdrom_subchnl info;
+ info.cdsc_format = CDROM_MSF;
+
+ bool isCD = ioctl(fd, CDROMSUBCHNL, &info) == 0 || isTrayEmpty(errno);
+ ::close(fd);
+ if (isCD) {
+ devices.push_back(Device(drive, device));
+ return true;
+ }
+ }
+
+ return false;
+}
+
+bool LinuxAudioCDManager::tryAddDrive(DeviceList &devices, dev_t device) {
+ // Construct the block name
+ // TODO: libblkid's blkid_devno_to_devname is exactly what we look for.
+ // This requires an external dependency though.
+ Common::String name = Common::String::format("/dev/block/%d:%d", major(device), minor(device));
+
+ return tryAddDrive(devices, name, device);
+}
+
+bool LinuxAudioCDManager::tryAddPath(DeviceList &devices, const Common::String &path) {
+ struct stat stbuf;
+ if (stat(path.c_str(), &stbuf) < 0)
+ return false;
+
+ return tryAddDrive(devices, stbuf.st_dev);
+}
+
+bool LinuxAudioCDManager::tryAddGamePath(DeviceList &devices) {
+ if (!ConfMan.hasKey("path"))
+ return false;
+
+ return tryAddPath(devices, ConfMan.get("path"));
+}
+
+bool LinuxAudioCDManager::loadTOC() {
+ if (_fd < 0)
+ return false;
+
+ if (ioctl(_fd, CDROMREADTOCHDR, &_tocHeader) < 0)
+ return false;
+
+ debug(4, "CD: Start Track: %d, End Track %d", _tocHeader.cdth_trk0, _tocHeader.cdth_trk1);
+
+ for (int i = _tocHeader.cdth_trk0; i <= _tocHeader.cdth_trk1; i++) {
+ cdrom_tocentry entry;
+ memset(&entry, 0, sizeof(entry));
+ entry.cdte_track = i;
+ entry.cdte_format = CDROM_MSF;
+
+ if (ioctl(_fd, CDROMREADTOCENTRY, &entry) < 0)
+ return false;
+
+#if 0
+ debug("Entry:");
+ debug("\tTrack: %d", entry.cdte_track);
+ debug("\tAdr: %d", entry.cdte_adr);
+ debug("\tCtrl: %d", entry.cdte_ctrl);
+ debug("\tFormat: %d", entry.cdte_format);
+ debug("\tMSF: %d:%d:%d", entry.cdte_addr.msf.minute, entry.cdte_addr.msf.second, entry.cdte_addr.msf.frame);
+ debug("\tMode: %d\n", entry.cdte_datamode);
+#endif
+
+ _tocEntries.push_back(entry);
+ }
+
+ // Fetch the leadout so we can get the length of the last frame
+ cdrom_tocentry entry;
+ memset(&entry, 0, sizeof(entry));
+ entry.cdte_track = kLeadoutTrack;
+ entry.cdte_format = CDROM_MSF;
+
+ if (ioctl(_fd, CDROMREADTOCENTRY, &entry) < 0)
+ return false;
+
+#if 0
+ debug("Lead out:");
+ debug("\tTrack: %d", entry.cdte_track);
+ debug("\tAdr: %d", entry.cdte_adr);
+ debug("\tCtrl: %d", entry.cdte_ctrl);
+ debug("\tFormat: %d", entry.cdte_format);
+ debug("\tMSF: %d:%d:%d", entry.cdte_addr.msf.minute, entry.cdte_addr.msf.second, entry.cdte_addr.msf.frame);
+ debug("\tMode: %d\n", entry.cdte_datamode);
+#endif
+
+ _tocEntries.push_back(entry);
+ return true;
+}
+
+bool LinuxAudioCDManager::hasDevice(const DeviceList &devices, dev_t device) {
+ for (DeviceList::const_iterator it = devices.begin(); it != devices.end(); it++)
+ if (it->device == device)
+ return true;
+
+ return false;
+}
+
+AudioCDManager *createLinuxAudioCDManager() {
+ return new LinuxAudioCDManager();
+}
+
+#endif // USE_LINUXCD