aa6ff44440
Engines should only have to call one set of functions and not decide between the two. In fact, the 'emulation' API was documented to just call the 'real CD' API.
500 lines
13 KiB
C++
500 lines
13 KiB
C++
/* Cabal - Legacy Game Implementations
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*
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* Cabal is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "backends/audiocd/win32/win32-audiocd.h"
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#include "audio/audiostream.h"
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#include "backends/audiocd/default/default-audiocd.h"
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#include "common/array.h"
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#include "common/config-manager.h"
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#include "common/debug.h"
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#include "common/mutex.h"
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#include "common/queue.h"
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#include "common/str.h"
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#include "common/timer.h"
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#ifdef _MSC_VER
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#include <winioctl.h>
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#include <ntddcdrm.h>
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#else
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#include <ddk/ntddcdrm.h>
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#endif
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enum {
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kLeadoutTrack = 0xAA
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};
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enum {
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kBytesPerFrame = 2352,
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kSamplesPerFrame = kBytesPerFrame / 2
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};
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enum {
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kSecondsPerMinute = 60,
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kFramesPerSecond = 75
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};
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enum {
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// The CD-ROM pre-gap is 2s
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kPreGapFrames = kFramesPerSecond * 2
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};
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enum {
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// Keep about a second's worth of audio in the buffer
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kBufferThreshold = kFramesPerSecond
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};
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static int getFrameCount(const TRACK_DATA &data) {
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int time = data.Address[1];
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time *= kSecondsPerMinute;
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time += data.Address[2];
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time *= kFramesPerSecond;
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time += data.Address[3];
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return time;
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}
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class Win32AudioCDStream : public Audio::SeekableAudioStream {
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public:
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Win32AudioCDStream(HANDLE handle, const TRACK_DATA &startEntry, const TRACK_DATA &endEntry);
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~Win32AudioCDStream();
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int readBuffer(int16 *buffer, const int numSamples);
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bool isStereo() const { return true; }
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int getRate() const { return 44100; }
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bool endOfData() const;
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bool seek(const Audio::Timestamp &where);
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Audio::Timestamp getLength() const;
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private:
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HANDLE _driveHandle;
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const TRACK_DATA &_startEntry, &_endEntry;
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int16 _buffer[kSamplesPerFrame];
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int _frame;
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uint _bufferPos;
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Common::Queue<int16 *> _bufferQueue;
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int _bufferFrame;
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Common::Mutex _mutex;
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bool readNextFrame();
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static void timerProc(void *refCon);
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void onTimer();
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void emptyQueue();
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void startTimer();
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void stopTimer();
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};
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Win32AudioCDStream::Win32AudioCDStream(HANDLE handle, const TRACK_DATA &startEntry, const TRACK_DATA &endEntry) :
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_driveHandle(handle), _startEntry(startEntry), _endEntry(endEntry), _buffer(), _frame(0), _bufferPos(kSamplesPerFrame), _bufferFrame(0) {
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startTimer();
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}
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Win32AudioCDStream::~Win32AudioCDStream() {
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stopTimer();
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emptyQueue();
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}
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int Win32AudioCDStream::readBuffer(int16 *buffer, const int numSamples) {
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int samples = 0;
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// See if any data is left first
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while (_bufferPos < kSamplesPerFrame && samples < numSamples)
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buffer[samples++] = _buffer[_bufferPos++];
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// Bail out if done
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if (endOfData())
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return samples;
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while (samples < numSamples && !endOfData()) {
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if (!readNextFrame())
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return samples;
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// Copy the samples over
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for (_bufferPos = 0; _bufferPos < kSamplesPerFrame && samples < numSamples; )
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buffer[samples++] = _buffer[_bufferPos++];
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}
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return samples;
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}
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bool Win32AudioCDStream::readNextFrame() {
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// Fetch a frame from the queue
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int16 *buffer;
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{
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Common::StackLock lock(_mutex);
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// Nothing we can do if it's empty
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if (_bufferQueue.empty())
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return false;
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buffer = _bufferQueue.pop();
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}
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memcpy(_buffer, buffer, kSamplesPerFrame * 2);
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delete[] buffer;
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_frame++;
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return true;
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}
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bool Win32AudioCDStream::endOfData() const {
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return getFrameCount(_startEntry) + _frame >= getFrameCount(_endEntry) && _bufferPos == kSamplesPerFrame;
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}
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bool Win32AudioCDStream::seek(const Audio::Timestamp &where) {
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// Stop the timer
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stopTimer();
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// Clear anything out of the queue
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emptyQueue();
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// Convert to the frame number
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// Really not much else needed
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_bufferPos = kSamplesPerFrame;
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_frame = where.convertToFramerate(kFramesPerSecond).totalNumberOfFrames();
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_bufferFrame = _frame;
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// Start the timer again
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startTimer();
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return true;
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}
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Audio::Timestamp Win32AudioCDStream::getLength() const {
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return Audio::Timestamp(0, getFrameCount(_endEntry) - getFrameCount(_startEntry), 75);
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}
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void Win32AudioCDStream::timerProc(void *refCon) {
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static_cast<Win32AudioCDStream *>(refCon)->onTimer();
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}
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void Win32AudioCDStream::onTimer() {
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// The goal here is to do as much work in this timer instead
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// of doing it in the readBuffer() call, which is the mixer.
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// If we're done, bail.
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if (getFrameCount(_startEntry) + _bufferFrame >= getFrameCount(_endEntry))
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return;
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// Get a quick count of the number of items in the queue
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// We don't care that much; we only need a quick estimate
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_mutex.lock();
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uint32 queueCount = _bufferQueue.size();
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_mutex.unlock();
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// If we have enough audio buffered, bail out
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if (queueCount >= kBufferThreshold)
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return;
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while (queueCount < kBufferThreshold && getFrameCount(_startEntry) + _bufferFrame < getFrameCount(_endEntry)) {
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int16 *buffer = new int16[kSamplesPerFrame];
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// Figure out the MSF of the frame we're looking for
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int frame = _bufferFrame + getFrameCount(_startEntry);
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// Request to read that frame
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RAW_READ_INFO readAudio;
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memset(&readAudio, 0, sizeof(readAudio));
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readAudio.DiskOffset.QuadPart = (frame - kPreGapFrames) * 2048;
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readAudio.SectorCount = 1;
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readAudio.TrackMode = CDDA;
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DWORD bytesReturned;
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bool result = DeviceIoControl(
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_driveHandle,
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IOCTL_CDROM_RAW_READ,
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&readAudio,
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sizeof(readAudio),
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buffer,
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kBytesPerFrame,
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&bytesReturned,
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NULL);
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if (!result) {
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warning("Failed to retrieve CD sector %d: %d", frame, (int)GetLastError());
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_bufferFrame = getFrameCount(_endEntry) - getFrameCount(_startEntry);
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return;
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}
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_bufferFrame++;
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// Now push the buffer onto the queue
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Common::StackLock lock(_mutex);
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_bufferQueue.push(buffer);
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queueCount = _bufferQueue.size();
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}
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}
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void Win32AudioCDStream::startTimer() {
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g_system->getTimerManager()->installTimerProc(timerProc, 10 * 1000, this, "Win32AudioCDStream");
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}
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void Win32AudioCDStream::stopTimer() {
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g_system->getTimerManager()->removeTimerProc(timerProc);
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}
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void Win32AudioCDStream::emptyQueue() {
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while (!_bufferQueue.empty())
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delete[] _bufferQueue.pop();
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}
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class Win32AudioCDManager : public DefaultAudioCDManager {
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public:
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Win32AudioCDManager();
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~Win32AudioCDManager();
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bool open();
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void close();
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void play(int track, int numLoops, int startFrame, int duration, bool onlyEmulate = false);
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protected:
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bool openCD(int drive);
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bool openCD(const Common::String &drive);
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private:
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bool loadTOC();
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typedef Common::Array<char> DriveList;
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DriveList detectDrives();
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bool tryAddDrive(char drive, DriveList &drives);
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HANDLE _driveHandle;
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int _firstTrack, _lastTrack;
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Common::Array<TRACK_DATA> _tocEntries;
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};
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Win32AudioCDManager::Win32AudioCDManager() {
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_driveHandle = INVALID_HANDLE_VALUE;
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_firstTrack = _lastTrack = 0;
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}
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Win32AudioCDManager::~Win32AudioCDManager() {
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close();
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}
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bool Win32AudioCDManager::open() {
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close();
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if (openRealCD())
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return true;
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return DefaultAudioCDManager::open();
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}
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bool Win32AudioCDManager::openCD(int drive) {
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// Fetch the drive list
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DriveList drives = detectDrives();
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if (drive >= (int)drives.size())
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return false;
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debug(1, "Opening CD drive %c:\\", drives[drive]);
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// Construct the drive path and try to open it
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Common::String drivePath = Common::String::format("\\\\.\\%c:", drives[drive]);
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_driveHandle = CreateFileA(drivePath.c_str(), GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
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if (_driveHandle == INVALID_HANDLE_VALUE) {
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warning("Failed to open drive %c:\\, error %d", drives[drive], (int)GetLastError());
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return false;
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}
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if (!loadTOC()) {
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close();
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return false;
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}
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return true;
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}
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bool Win32AudioCDManager::openCD(const Common::String &drive) {
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// Just some bounds checking
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if (drive.empty() || drive.size() > 3)
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return false;
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if (!Common::isAlpha(drive[0]) || drive[1] != ':')
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return false;
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if (drive[2] != 0 && drive[2] != '\\')
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return false;
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DriveList drives;
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if (!tryAddDrive(toupper(drive[0]), drives))
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return false;
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// Construct the drive path and try to open it
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Common::String drivePath = Common::String::format("\\\\.\\%c:", drives[0]);
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_driveHandle = CreateFileA(drivePath.c_str(), GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
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if (_driveHandle == INVALID_HANDLE_VALUE) {
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warning("Failed to open drive %c:\\, error %d", drives[0], (int)GetLastError());
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return false;
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}
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if (!loadTOC()) {
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close();
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return false;
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}
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return true;
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}
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void Win32AudioCDManager::close() {
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DefaultAudioCDManager::close();
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if (_driveHandle != INVALID_HANDLE_VALUE) {
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CloseHandle(_driveHandle);
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_driveHandle = INVALID_HANDLE_VALUE;
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}
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_firstTrack = _lastTrack = 0;
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_tocEntries.clear();
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}
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bool Win32AudioCDManager::play(int track, int numLoops, int startFrame, int duration, bool onlyEmulate) {
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// Prefer emulation
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if (DefaultAudioCDManager::play(track, numLoops, startFrame, duration, onlyEmulate))
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return true;
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// If we're set to only emulate, or have no CD drive, return here
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if (onlyEmulate || _driveHandle == INVALID_HANDLE_VALUE)
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return false;
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// HACK: For now, just assume that track number is right
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// That only works because ScummVM uses the wrong track number anyway
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if (track >= (int)_tocEntries.size() - 1) {
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warning("No such track %d", track);
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return false;
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}
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// Bail if the track isn't an audio track
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if ((_tocEntries[track].Control & 0x04) != 0) {
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warning("Track %d is not audio", track);
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return false;
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}
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// Create the AudioStream and play it
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debug(1, "Playing CD track %d", track);
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Audio::SeekableAudioStream *audioStream = new Win32AudioCDStream(_driveHandle, _tocEntries[track], _tocEntries[track + 1]);
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Audio::Timestamp start = Audio::Timestamp(0, startFrame, 75);
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Audio::Timestamp end = (duration == 0) ? audioStream->getLength() : Audio::Timestamp(0, startFrame + duration, 75);
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// Fake emulation since we're really playing an AudioStream
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_emulating = true;
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_mixer->playStream(
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Audio::Mixer::kMusicSoundType,
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&_handle,
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Audio::makeLoopingAudioStream(audioStream, start, end, (numLoops < 1) ? numLoops + 1 : numLoops),
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-1,
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_cd.volume,
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_cd.balance,
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DisposeAfterUse::YES,
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true);
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return true;
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}
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bool Win32AudioCDManager::loadTOC() {
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CDROM_READ_TOC_EX tocRequest;
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memset(&tocRequest, 0, sizeof(tocRequest));
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tocRequest.Format = CDROM_READ_TOC_EX_FORMAT_TOC;
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tocRequest.Msf = 1;
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tocRequest.SessionTrack = 0;
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DWORD bytesReturned;
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CDROM_TOC tocData;
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bool result = DeviceIoControl(
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_driveHandle,
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IOCTL_CDROM_READ_TOC_EX,
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&tocRequest,
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sizeof(tocRequest),
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&tocData,
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sizeof(tocData),
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&bytesReturned,
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NULL);
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if (!result) {
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debug("Failed to query the CD TOC: %d", (int)GetLastError());
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return false;
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}
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_firstTrack = tocData.FirstTrack;
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_lastTrack = tocData.LastTrack;
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#if 0
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debug("First Track: %d", tocData.FirstTrack);
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debug("Last Track: %d", tocData.LastTrack);
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#endif
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for (uint32 i = 0; i < (bytesReturned - 4) / sizeof(TRACK_DATA); i++)
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_tocEntries.push_back(tocData.TrackData[i]);
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#if 0
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for (uint32 i = 0; i < _tocEntries.size(); i++) {
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const TRACK_DATA &entry = _tocEntries[i];
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debug("Entry:");
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debug("\tTrack: %d", entry.TrackNumber);
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debug("\tAdr: %d", entry.Adr);
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debug("\tCtrl: %d", entry.Control);
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debug("\tMSF: %d:%d:%d\n", entry.Address[1], entry.Address[2], entry.Address[3]);
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}
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#endif
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return true;
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}
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Win32AudioCDManager::DriveList Win32AudioCDManager::detectDrives() {
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DriveList drives;
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// Try to get the game path's drive
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char gameDrive = 0;
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if (ConfMan.hasKey("path")) {
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Common::String gamePath = ConfMan.get("path");
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char fullPath[MAX_PATH];
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DWORD result = GetFullPathNameA(gamePath.c_str(), sizeof(fullPath), fullPath, 0);
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if (result > 0 && result < sizeof(fullPath) && Common::isAlpha(fullPath[0]) && fullPath[1] == ':' && tryAddDrive(toupper(fullPath[0]), drives))
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gameDrive = drives[0];
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}
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// Try adding the rest of the drives
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for (char drive = 'A'; drive <= 'Z'; drive++)
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if (drive != gameDrive)
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tryAddDrive(drive, drives);
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return drives;
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}
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bool Win32AudioCDManager::tryAddDrive(char drive, DriveList &drives) {
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Common::String drivePath = Common::String::format("%c:\\", drive);
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// Ensure it's an actual CD drive
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if (GetDriveTypeA(drivePath.c_str()) != DRIVE_CDROM)
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return false;
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debug(2, "Detected drive %c:\\ as a CD drive", drive);
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drives.push_back(drive);
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return true;
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}
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AudioCDManager *createWin32AudioCDManager() {
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return new Win32AudioCDManager();
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}
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