engines/gig/DiskThread.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 Christian Schoenebeck                              *
 *                                                                         *
 *   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., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#include <sstream>

#include "DiskThread.h"

namespace LinuxSampler { namespace gig {

    // *********** DiskThread **************
    // *


    // just a placeholder to mark a cell in the pickup array as 'reserved'
    Stream* DiskThread::SLOT_RESERVED = (Stream*) &SLOT_RESERVED;


    // #########################################################################
    // # Foreign Thread Section
    // #         (following code intended to be interface for audio thread)


    /**
     * Suspend disk thread, kill all active streams, clear all queues and the
     * pickup array and reset all streams. Call this method to bring everything
     * in the disk thread to day one. If the disk thread was running, it will be
     * respawned right after everything was reset.
     */
    void DiskThread::Reset() {
        bool running = this->IsRunning();
        if (running) this->StopThread();
        for (int i = 0; i < CONFIG_MAX_STREAMS; i++) {
            pStreams[i]->Kill();
        }
        for (int i = 1; i <= CONFIG_MAX_STREAMS; i++) {
            pCreatedStreams[i] = NULL;
        }
        GhostQueue->init();
        CreationQueue->init();
        DeletionQueue->init();
        ActiveStreamCount = 0;
        ActiveStreamCountMax = 0;
        if (running) this->StartThread(); // start thread only if it was running before
    }

    String DiskThread::GetBufferFillBytes() {
        bool activestreams = false;
        std::stringstream ss;
        for (uint i = 0; i < this->Streams; i++) {
            if (pStreams[i]->GetState() == Stream::state_unused) continue;
            uint bufferfill = pStreams[i]->GetReadSpace() * sizeof(sample_t);
            uint streamid   = (uint) pStreams[i]->GetHandle();
            if (!streamid) continue;

            if (activestreams) ss << ",[" << streamid << ']' << bufferfill;
            else {
                ss << '[' << streamid << ']' << bufferfill;
                activestreams = true;
            }
        }
        return ss.str();
    }

    String DiskThread::GetBufferFillPercentage() {
        bool activestreams = false;
        std::stringstream ss;
        for (uint i = 0; i < this->Streams; i++) {
            if (pStreams[i]->GetState() == Stream::state_unused) continue;
            uint bufferfill = (uint) ((float) pStreams[i]->GetReadSpace() / (float) CONFIG_STREAM_BUFFER_SIZE * 100);
            uint streamid   = (uint) pStreams[i]->GetHandle();
            if (!streamid) continue;

            if (activestreams) ss << ",[" << streamid << ']' << bufferfill << '%';
            else {
                ss << '[' << streamid << ']' << bufferfill;
                activestreams = true;
            }
        }
        return ss.str();
    }

    /**
     * Returns -1 if command queue or pickup pool is full, 0 on success (will be
     * called by audio thread within the voice class).
     */
    int DiskThread::OrderNewStream(Stream::reference_t* pStreamRef, ::gig::Sample* pSample, unsigned long SampleOffset, bool DoLoop) {
        dmsg(4,("Disk Thread: new stream ordered\n"));
        if (CreationQueue->write_space() < 1) {
            dmsg(1,("DiskThread: Order queue full!\n"));
            return -1;
        }

        const Stream::OrderID_t newOrder = CreateOrderID();
        if (!newOrder) {
                dmsg(1,("DiskThread: there was no free slot\n"));
                return -1; // there was no free slot
        }

        pStreamRef->State   = Stream::state_active;
        pStreamRef->OrderID = newOrder;
        pStreamRef->hStream = CreateHandle();
        pStreamRef->pStream = NULL; // a stream has to be activated by the disk thread first

        create_command_t cmd;
        cmd.OrderID      = pStreamRef->OrderID;
        cmd.hStream      = pStreamRef->hStream;
        cmd.pStreamRef   = pStreamRef;
        cmd.pSample      = pSample;
        cmd.SampleOffset = SampleOffset;
        cmd.DoLoop       = DoLoop;

        CreationQueue->push(&cmd);
        return 0;
    }

    /**
     * Returns -1 if command queue is full, 0 on success (will be called by audio
     * thread within the voice class).
     */
    int DiskThread::OrderDeletionOfStream(Stream::reference_t* pStreamRef) {
        dmsg(4,("Disk Thread: stream deletion ordered\n"));
        if (DeletionQueue->write_space() < 1) {
            dmsg(1,("DiskThread: Deletion queue full!\n"));
            return -1;
        }

        delete_command_t cmd;
        cmd.pStream = pStreamRef->pStream;
        cmd.hStream = pStreamRef->hStream;
        cmd.OrderID = pStreamRef->OrderID;

        DeletionQueue->push(&cmd);
        return 0;
    }

    /**
     * Returns the pointer to a disk stream if the ordered disk stream
     * represented by the \a StreamOrderID was already activated by the disk
     * thread, returns NULL otherwise. If the call was successful, thus if it
     * returned a valid stream pointer, the caller has to the store that pointer
     * by himself, because it's not possible to call this method again with the
     * same used order ID; this method is just intended for picking up an ordered
     * disk stream. This method will usually be called by the voice class (within
     * the audio thread).
     *
     * @param StreamOrderID - ID previously returned by OrderNewStream()
     * @returns               pointer to created stream object, NULL otherwise
     */
    Stream* DiskThread::AskForCreatedStream(Stream::OrderID_t StreamOrderID) {
        dmsg(4,("Disk Thread: been asked if stream already created, OrderID=%x ", StreamOrderID));
        Stream* pStream = pCreatedStreams[StreamOrderID];
        if (pStream && pStream != SLOT_RESERVED) {
            dmsg(4,("(yes created)\n"));
            pCreatedStreams[StreamOrderID] = NULL; // free the slot for a new order
            return pStream;
        }
        dmsg(4,("(no not yet created)\n"));
        return NULL;
    }


    // #########################################################################
    // # Disk Thread Only Section
    // #         (following code should only be executed by the disk thread)


    DiskThread::DiskThread(uint BufferWrapElements) : Thread(true, false, 1, -2) {
        DecompressionBuffer = ::gig::Sample::CreateDecompressionBuffer(CONFIG_STREAM_MAX_REFILL_SIZE);
        CreationQueue       = new RingBuffer<create_command_t>(1024);
        DeletionQueue       = new RingBuffer<delete_command_t>(1024);
        GhostQueue          = new RingBuffer<Stream::Handle>(CONFIG_MAX_STREAMS);
        Streams             = CONFIG_MAX_STREAMS;
        RefillStreamsPerRun = CONFIG_REFILL_STREAMS_PER_RUN;
        for (int i = 0; i < CONFIG_MAX_STREAMS; i++) {
            pStreams[i] = new Stream(&DecompressionBuffer, CONFIG_STREAM_BUFFER_SIZE, BufferWrapElements); // 131072 sample words
        }
        for (int i = 1; i <= CONFIG_MAX_STREAMS; i++) {
            pCreatedStreams[i] = NULL;
        }
    }

    DiskThread::~DiskThread() {
        for (int i = 0; i < CONFIG_MAX_STREAMS; i++) {
            if (pStreams[i]) delete pStreams[i];
        }
        if (CreationQueue) delete CreationQueue;
        if (DeletionQueue) delete DeletionQueue;
        if (GhostQueue)    delete GhostQueue;
        ::gig::Sample::DestroyDecompressionBuffer(DecompressionBuffer);
    }

    int DiskThread::Main() {
        dmsg(3,("Disk thread running\n"));
        while (true) {
            pthread_testcancel(); // mandatory for OSX
            IsIdle = true; // will be set to false if a stream got filled

            // if there are ghost streams, delete them
            for (int i = 0; i < GhostQueue->read_space(); i++) { //FIXME: unefficient
                Stream::Handle hGhostStream;
                GhostQueue->pop(&hGhostStream);
                bool found = false;
                for (int i = 0; i < this->Streams; i++) {
                    if (pStreams[i]->GetHandle() == hGhostStream) {
                        pStreams[i]->Kill();
                        found = true;
                        break;
                    }
                }
                if (!found) GhostQueue->push(&hGhostStream); // put ghost stream handle back to the queue
            }

            // if there are creation commands, create new streams
            while (Stream::UnusedStreams > 0 && CreationQueue->read_space() > 0) {
                create_command_t command;
                CreationQueue->pop(&command);
                CreateStream(command);
            }

            // if there are deletion commands, delete those streams
            while (Stream::UnusedStreams < Stream::TotalStreams && DeletionQueue->read_space() > 0) {
                delete_command_t command;
                DeletionQueue->pop(&command);
                DeleteStream(command);
            }

            RefillStreams(); // refill the most empty streams

            // if nothing was done during this iteration (eg no streambuffer
            // filled with data) then sleep for 50ms
            if (IsIdle) usleep(30000);

            int streamsInUsage = 0;
            for (int i = Streams - 1; i >= 0; i--) {
                if (pStreams[i]->GetState() != Stream::state_unused) streamsInUsage++;
            }
            ActiveStreamCount = streamsInUsage;
            if (streamsInUsage > ActiveStreamCountMax) ActiveStreamCountMax = streamsInUsage;
        }

        return EXIT_FAILURE;
    }

    void DiskThread::CreateStream(create_command_t& Command) {
        // search for unused stream
        Stream* newstream = NULL;
        for (int i = Streams - 1; i >= 0; i--) {
            if (pStreams[i]->GetState() == Stream::state_unused) {
                newstream = pStreams[i];
                break;
            }
        }
        if (!newstream) {
            std::cerr << "No unused stream found (OrderID:" << Command.OrderID << ") - report if this happens, this is a bug!\n" << std::flush;
            return;
        }
        newstream->Launch(Command.hStream, Command.pStreamRef, Command.pSample, Command.SampleOffset, Command.DoLoop);
        dmsg(4,("new Stream launched by disk thread (OrderID:%d,StreamHandle:%d)\n", Command.OrderID, Command.hStream));
        if (pCreatedStreams[Command.OrderID] != SLOT_RESERVED) {
            std::cerr << "DiskThread: Slot " << Command.OrderID << " already occupied! Please report this!\n" << std::flush;
            newstream->Kill();
            return;
        }
        pCreatedStreams[Command.OrderID] = newstream;
    }

    void DiskThread::DeleteStream(delete_command_t& Command) {
        if (Command.pStream) Command.pStream->Kill();
        else { // the stream wasn't created by disk thread or picked up by audio thread yet

            // if stream was created but not picked up yet
            Stream* pStream = pCreatedStreams[Command.OrderID];
            if (pStream && pStream != SLOT_RESERVED) {
                pStream->Kill();
                pCreatedStreams[Command.OrderID] = NULL; // free slot for new order
                return;
            }

            // the stream was not created yet
            if (GhostQueue->write_space() > 0) {
                GhostQueue->push(&Command.hStream);
            }
            else dmsg(1,("DiskThread: GhostQueue full!\n"));
        }
    }

    void DiskThread::RefillStreams() {
        // sort the streams by most empty stream
        qsort(pStreams, Streams, sizeof(Stream*), CompareStreamWriteSpace);

        // refill the most empty streams
        for (uint i = 0; i < RefillStreamsPerRun; i++) {
            if (pStreams[i]->GetState() == Stream::state_active) {

                //float filledpercentage = (float) pStreams[i]->GetReadSpace() / 131072.0 * 100.0;
                //dmsg(("\nbuffer fill: %.1f%\n", filledpercentage));

                int writespace = pStreams[i]->GetWriteSpaceToEnd();
                if (writespace == 0) break;

                int capped_writespace = writespace;
                // if there is too much buffer space available then cut the read/write
                // size to CONFIG_STREAM_MAX_REFILL_SIZE which is by default 65536 samples = 256KBytes
                if (writespace > CONFIG_STREAM_MAX_REFILL_SIZE) capped_writespace = CONFIG_STREAM_MAX_REFILL_SIZE;

                // adjust the amount to read in order to ensure that the buffer wraps correctly
                int read_amount = pStreams[i]->AdjustWriteSpaceToAvoidBoundary(writespace, capped_writespace);
                // if we wasn't able to refill one of the stream buffers by more than
                // CONFIG_STREAM_MIN_REFILL_SIZE we'll send the disk thread to sleep later
                if (pStreams[i]->ReadAhead(read_amount) > CONFIG_STREAM_MIN_REFILL_SIZE) this->IsIdle = false;
            }
        }
    }

    /// Handle Generator
    Stream::Handle DiskThread::CreateHandle() {
        static uint32_t counter = 0;
        if (counter == 0xffffffff) counter = 1; // we use '0' as 'invalid handle' only, so we skip 0
        else                       counter++;
        return counter;
    }

    /// order ID Generator
    Stream::OrderID_t DiskThread::CreateOrderID() {
        static Stream::OrderID_t counter(0);
        for (int i = 0; i < CONFIG_MAX_STREAMS; i++) {
            if (counter == CONFIG_MAX_STREAMS) counter = 1; // we use '0' as 'invalid order' only, so we skip 0
            else                              counter++;
            if (!pCreatedStreams[counter]) {
                pCreatedStreams[counter] = SLOT_RESERVED; // mark this slot as reserved
                return counter;                           // found empty slot
            }
        }
        return 0; // no free slot
    }


    // *********** C functions **************
    // *

    /**
     * This is the comparison function the qsort algo uses to determine if a value is
     * bigger than another one or special in our case; if the writespace of a stream
     * is bigger than another one.
     */
    int CompareStreamWriteSpace(const void* A, const void* B) {
        Stream* a = *(Stream**) A;
        Stream* b = *(Stream**) B;
        return b->GetWriteSpace() - a->GetWriteSpace();
    }

}} // namespace LinuxSampler::gig
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005 Christian Schoenebeck *
7	* *
8	* This program is free software; you can redistribute it and/or modify *
9	* it under the terms of the GNU General Public License as published by *
10	* the Free Software Foundation; either version 2 of the License, or *
11	* (at your option) any later version. *
12	* *
13	* This program is distributed in the hope that it will be useful, *
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16	* GNU General Public License for more details. *
17	* *
18	* You should have received a copy of the GNU General Public License *
19	* along with this program; if not, write to the Free Software *
20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21	* MA 02111-1307 USA *
22	***************************************************************************/
23
24	#include <sstream>
25
26	#include "DiskThread.h"
27
28	namespace LinuxSampler { namespace gig {
29
30	// ********* DiskThread ************
31	// *
32
33
34	// just a placeholder to mark a cell in the pickup array as 'reserved'
35	Stream* DiskThread::SLOT_RESERVED = (Stream*) &SLOT_RESERVED;
36
37
38	// #########################################################################
39	// # Foreign Thread Section
40	// # (following code intended to be interface for audio thread)
41
42
43	/**
44	* Suspend disk thread, kill all active streams, clear all queues and the
45	* pickup array and reset all streams. Call this method to bring everything
46	* in the disk thread to day one. If the disk thread was running, it will be
47	* respawned right after everything was reset.
48	*/
49	void DiskThread::Reset() {
50	bool running = this->IsRunning();
51	if (running) this->StopThread();
52	for (int i = 0; i < CONFIG_MAX_STREAMS; i++) {
53	pStreams[i]->Kill();
54	}
55	for (int i = 1; i <= CONFIG_MAX_STREAMS; i++) {
56	pCreatedStreams[i] = NULL;
57	}
58	GhostQueue->init();
59	CreationQueue->init();
60	DeletionQueue->init();
61	ActiveStreamCount = 0;
62	ActiveStreamCountMax = 0;
63	if (running) this->StartThread(); // start thread only if it was running before
64	}
65
66	String DiskThread::GetBufferFillBytes() {
67	bool activestreams = false;
68	std::stringstream ss;
69	for (uint i = 0; i < this->Streams; i++) {
70	if (pStreams[i]->GetState() == Stream::state_unused) continue;
71	uint bufferfill = pStreams[i]->GetReadSpace() * sizeof(sample_t);
72	uint streamid = (uint) pStreams[i]->GetHandle();
73	if (!streamid) continue;
74
75	if (activestreams) ss << ",[" << streamid << ']' << bufferfill;
76	else {
77	ss << '[' << streamid << ']' << bufferfill;
78	activestreams = true;
79	}
80	}
81	return ss.str();
82	}
83
84	String DiskThread::GetBufferFillPercentage() {
85	bool activestreams = false;
86	std::stringstream ss;
87	for (uint i = 0; i < this->Streams; i++) {
88	if (pStreams[i]->GetState() == Stream::state_unused) continue;
89	uint bufferfill = (uint) ((float) pStreams[i]->GetReadSpace() / (float) CONFIG_STREAM_BUFFER_SIZE * 100);
90	uint streamid = (uint) pStreams[i]->GetHandle();
91	if (!streamid) continue;
92
93	if (activestreams) ss << ",[" << streamid << ']' << bufferfill << '%';
94	else {
95	ss << '[' << streamid << ']' << bufferfill;
96	activestreams = true;
97	}
98	}
99	return ss.str();
100	}
101
102	/**
103	* Returns -1 if command queue or pickup pool is full, 0 on success (will be
104	* called by audio thread within the voice class).
105	*/
106	int DiskThread::OrderNewStream(Stream::reference_t* pStreamRef, ::gig::Sample* pSample, unsigned long SampleOffset, bool DoLoop) {
107	dmsg(4,("Disk Thread: new stream ordered\n"));
108	if (CreationQueue->write_space() < 1) {
109	dmsg(1,("DiskThread: Order queue full!\n"));
110	return -1;
111	}
112
113	const Stream::OrderID_t newOrder = CreateOrderID();
114	if (!newOrder) {
115	dmsg(1,("DiskThread: there was no free slot\n"));
116	return -1; // there was no free slot
117	}
118
119	pStreamRef->State = Stream::state_active;
120	pStreamRef->OrderID = newOrder;
121	pStreamRef->hStream = CreateHandle();
122	pStreamRef->pStream = NULL; // a stream has to be activated by the disk thread first
123
124	create_command_t cmd;
125	cmd.OrderID = pStreamRef->OrderID;
126	cmd.hStream = pStreamRef->hStream;
127	cmd.pStreamRef = pStreamRef;
128	cmd.pSample = pSample;
129	cmd.SampleOffset = SampleOffset;
130	cmd.DoLoop = DoLoop;
131
132	CreationQueue->push(&cmd);
133	return 0;
134	}
135
136	/**
137	* Returns -1 if command queue is full, 0 on success (will be called by audio
138	* thread within the voice class).
139	*/
140	int DiskThread::OrderDeletionOfStream(Stream::reference_t* pStreamRef) {
141	dmsg(4,("Disk Thread: stream deletion ordered\n"));
142	if (DeletionQueue->write_space() < 1) {
143	dmsg(1,("DiskThread: Deletion queue full!\n"));
144	return -1;
145	}
146
147	delete_command_t cmd;
148	cmd.pStream = pStreamRef->pStream;
149	cmd.hStream = pStreamRef->hStream;
150	cmd.OrderID = pStreamRef->OrderID;
151
152	DeletionQueue->push(&cmd);
153	return 0;
154	}
155
156	/**
157	* Returns the pointer to a disk stream if the ordered disk stream
158	* represented by the \a StreamOrderID was already activated by the disk
159	* thread, returns NULL otherwise. If the call was successful, thus if it
160	* returned a valid stream pointer, the caller has to the store that pointer
161	* by himself, because it's not possible to call this method again with the
162	* same used order ID; this method is just intended for picking up an ordered
163	* disk stream. This method will usually be called by the voice class (within
164	* the audio thread).
165	*
166	* @param StreamOrderID - ID previously returned by OrderNewStream()
167	* @returns pointer to created stream object, NULL otherwise
168	*/
169	Stream* DiskThread::AskForCreatedStream(Stream::OrderID_t StreamOrderID) {
170	dmsg(4,("Disk Thread: been asked if stream already created, OrderID=%x ", StreamOrderID));
171	Stream* pStream = pCreatedStreams[StreamOrderID];
172	if (pStream && pStream != SLOT_RESERVED) {
173	dmsg(4,("(yes created)\n"));
174	pCreatedStreams[StreamOrderID] = NULL; // free the slot for a new order
175	return pStream;
176	}
177	dmsg(4,("(no not yet created)\n"));
178	return NULL;
179	}
180
181
182
183	// #########################################################################
184	// # Disk Thread Only Section
185	// # (following code should only be executed by the disk thread)
186
187
188	DiskThread::DiskThread(uint BufferWrapElements) : Thread(true, false, 1, -2) {
189	DecompressionBuffer = ::gig::Sample::CreateDecompressionBuffer(CONFIG_STREAM_MAX_REFILL_SIZE);
190	CreationQueue = new RingBuffer<create_command_t>(1024);
191	DeletionQueue = new RingBuffer<delete_command_t>(1024);
192	GhostQueue = new RingBuffer<Stream::Handle>(CONFIG_MAX_STREAMS);
193	Streams = CONFIG_MAX_STREAMS;
194	RefillStreamsPerRun = CONFIG_REFILL_STREAMS_PER_RUN;
195	for (int i = 0; i < CONFIG_MAX_STREAMS; i++) {
196	pStreams[i] = new Stream(&DecompressionBuffer, CONFIG_STREAM_BUFFER_SIZE, BufferWrapElements); // 131072 sample words
197	}
198	for (int i = 1; i <= CONFIG_MAX_STREAMS; i++) {
199	pCreatedStreams[i] = NULL;
200	}
201	}
202
203	DiskThread::~DiskThread() {
204	for (int i = 0; i < CONFIG_MAX_STREAMS; i++) {
205	if (pStreams[i]) delete pStreams[i];
206	}
207	if (CreationQueue) delete CreationQueue;
208	if (DeletionQueue) delete DeletionQueue;
209	if (GhostQueue) delete GhostQueue;
210	::gig::Sample::DestroyDecompressionBuffer(DecompressionBuffer);
211	}
212
213	int DiskThread::Main() {
214	dmsg(3,("Disk thread running\n"));
215	while (true) {
216	pthread_testcancel(); // mandatory for OSX
217	IsIdle = true; // will be set to false if a stream got filled
218
219	// if there are ghost streams, delete them
220	for (int i = 0; i < GhostQueue->read_space(); i++) { //FIXME: unefficient
221	Stream::Handle hGhostStream;
222	GhostQueue->pop(&hGhostStream);
223	bool found = false;
224	for (int i = 0; i < this->Streams; i++) {
225	if (pStreams[i]->GetHandle() == hGhostStream) {
226	pStreams[i]->Kill();
227	found = true;
228	break;
229	}
230	}
231	if (!found) GhostQueue->push(&hGhostStream); // put ghost stream handle back to the queue
232	}
233
234	// if there are creation commands, create new streams
235	while (Stream::UnusedStreams > 0 && CreationQueue->read_space() > 0) {
236	create_command_t command;
237	CreationQueue->pop(&command);
238	CreateStream(command);
239	}
240
241	// if there are deletion commands, delete those streams
242	while (Stream::UnusedStreams < Stream::TotalStreams && DeletionQueue->read_space() > 0) {
243	delete_command_t command;
244	DeletionQueue->pop(&command);
245	DeleteStream(command);
246	}
247
248	RefillStreams(); // refill the most empty streams
249
250	// if nothing was done during this iteration (eg no streambuffer
251	// filled with data) then sleep for 50ms
252	if (IsIdle) usleep(30000);
253
254	int streamsInUsage = 0;
255	for (int i = Streams - 1; i >= 0; i--) {
256	if (pStreams[i]->GetState() != Stream::state_unused) streamsInUsage++;
257	}
258	ActiveStreamCount = streamsInUsage;
259	if (streamsInUsage > ActiveStreamCountMax) ActiveStreamCountMax = streamsInUsage;
260	}
261
262	return EXIT_FAILURE;
263	}
264
265	void DiskThread::CreateStream(create_command_t& Command) {
266	// search for unused stream
267	Stream* newstream = NULL;
268	for (int i = Streams - 1; i >= 0; i--) {
269	if (pStreams[i]->GetState() == Stream::state_unused) {
270	newstream = pStreams[i];
271	break;
272	}
273	}
274	if (!newstream) {
275	std::cerr << "No unused stream found (OrderID:" << Command.OrderID << ") - report if this happens, this is a bug!\n" << std::flush;
276	return;
277	}
278	newstream->Launch(Command.hStream, Command.pStreamRef, Command.pSample, Command.SampleOffset, Command.DoLoop);
279	dmsg(4,("new Stream launched by disk thread (OrderID:%d,StreamHandle:%d)\n", Command.OrderID, Command.hStream));
280	if (pCreatedStreams[Command.OrderID] != SLOT_RESERVED) {
281	std::cerr << "DiskThread: Slot " << Command.OrderID << " already occupied! Please report this!\n" << std::flush;
282	newstream->Kill();
283	return;
284	}
285	pCreatedStreams[Command.OrderID] = newstream;
286	}
287
288	void DiskThread::DeleteStream(delete_command_t& Command) {
289	if (Command.pStream) Command.pStream->Kill();
290	else { // the stream wasn't created by disk thread or picked up by audio thread yet
291
292	// if stream was created but not picked up yet
293	Stream* pStream = pCreatedStreams[Command.OrderID];
294	if (pStream && pStream != SLOT_RESERVED) {
295	pStream->Kill();
296	pCreatedStreams[Command.OrderID] = NULL; // free slot for new order
297	return;
298	}
299
300	// the stream was not created yet
301	if (GhostQueue->write_space() > 0) {
302	GhostQueue->push(&Command.hStream);
303	}
304	else dmsg(1,("DiskThread: GhostQueue full!\n"));
305	}
306	}
307
308	void DiskThread::RefillStreams() {
309	// sort the streams by most empty stream
310	qsort(pStreams, Streams, sizeof(Stream*), CompareStreamWriteSpace);
311
312	// refill the most empty streams
313	for (uint i = 0; i < RefillStreamsPerRun; i++) {
314	if (pStreams[i]->GetState() == Stream::state_active) {
315
316	//float filledpercentage = (float) pStreams[i]->GetReadSpace() / 131072.0 * 100.0;
317	//dmsg(("\nbuffer fill: %.1f%\n", filledpercentage));
318
319	int writespace = pStreams[i]->GetWriteSpaceToEnd();
320	if (writespace == 0) break;
321
322	int capped_writespace = writespace;
323	// if there is too much buffer space available then cut the read/write
324	// size to CONFIG_STREAM_MAX_REFILL_SIZE which is by default 65536 samples = 256KBytes
325	if (writespace > CONFIG_STREAM_MAX_REFILL_SIZE) capped_writespace = CONFIG_STREAM_MAX_REFILL_SIZE;
326
327	// adjust the amount to read in order to ensure that the buffer wraps correctly
328	int read_amount = pStreams[i]->AdjustWriteSpaceToAvoidBoundary(writespace, capped_writespace);
329	// if we wasn't able to refill one of the stream buffers by more than
330	// CONFIG_STREAM_MIN_REFILL_SIZE we'll send the disk thread to sleep later
331	if (pStreams[i]->ReadAhead(read_amount) > CONFIG_STREAM_MIN_REFILL_SIZE) this->IsIdle = false;
332	}
333	}
334	}
335
336	/// Handle Generator
337	Stream::Handle DiskThread::CreateHandle() {
338	static uint32_t counter = 0;
339	if (counter == 0xffffffff) counter = 1; // we use '0' as 'invalid handle' only, so we skip 0
340	else counter++;
341	return counter;
342	}
343
344	/// order ID Generator
345	Stream::OrderID_t DiskThread::CreateOrderID() {
346	static Stream::OrderID_t counter(0);
347	for (int i = 0; i < CONFIG_MAX_STREAMS; i++) {
348	if (counter == CONFIG_MAX_STREAMS) counter = 1; // we use '0' as 'invalid order' only, so we skip 0
349	else counter++;
350	if (!pCreatedStreams[counter]) {
351	pCreatedStreams[counter] = SLOT_RESERVED; // mark this slot as reserved
352	return counter; // found empty slot
353	}
354	}
355	return 0; // no free slot
356	}
357
358
359
360	// ********* C functions ************
361	// *
362
363	/**
364	* This is the comparison function the qsort algo uses to determine if a value is
365	* bigger than another one or special in our case; if the writespace of a stream
366	* is bigger than another one.
367	*/
368	int CompareStreamWriteSpace(const void* A, const void* B) {
369	Stream* a = (Stream*) A;
370	Stream* b = (Stream*) B;
371	return b->GetWriteSpace() - a->GetWriteSpace();
372	}
373
374	}} // namespace LinuxSampler::gig