summaryrefslogtreecommitdiff
path: root/indra/llaudio/llstreamingaudio_fmodex.cpp
blob: 42f30aa1c44ef487795efbad38b58f03254fbd5e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
/** 
 * @file streamingaudio_fmodex.cpp
 * @brief LLStreamingAudio_FMODEX implementation
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "linden_common.h"

#include "llmath.h"

#include "fmod.hpp"
#include "fmod_errors.h"

#include "llstreamingaudio_fmodex.h"


class LLAudioStreamManagerFMODEX
{
public:
	LLAudioStreamManagerFMODEX(FMOD::System *system, const std::string& url);
	FMOD::Channel* startStream();
	bool stopStream(); // Returns true if the stream was successfully stopped.
	bool ready();

	const std::string& getURL() 	{ return mInternetStreamURL; }

	FMOD_OPENSTATE getOpenState(unsigned int* percentbuffered=NULL, bool* starving=NULL, bool* diskbusy=NULL);
protected:
	FMOD::System* mSystem;
	FMOD::Channel* mStreamChannel;
	FMOD::Sound* mInternetStream;
	bool mReady;

	std::string mInternetStreamURL;
};



//---------------------------------------------------------------------------
// Internet Streaming
//---------------------------------------------------------------------------
LLStreamingAudio_FMODEX::LLStreamingAudio_FMODEX(FMOD::System *system) :
	mSystem(system),
	mCurrentInternetStreamp(NULL),
	mFMODInternetStreamChannelp(NULL),
	mGain(1.0f)
{
	// Number of milliseconds of audio to buffer for the audio card.
	// Must be larger than the usual Second Life frame stutter time.
	const U32 buffer_seconds = 10;		//sec
	const U32 estimated_bitrate = 128;	//kbit/sec
	mSystem->setStreamBufferSize(estimated_bitrate * buffer_seconds * 128/*bytes/kbit*/, FMOD_TIMEUNIT_RAWBYTES);

	// Here's where we set the size of the network buffer and some buffering 
	// parameters.  In this case we want a network buffer of 16k, we want it 
	// to prebuffer 40% of that when we first connect, and we want it 
	// to rebuffer 80% of that whenever we encounter a buffer underrun.

	// Leave the net buffer properties at the default.
	//FSOUND_Stream_Net_SetBufferProperties(20000, 40, 80);
}


LLStreamingAudio_FMODEX::~LLStreamingAudio_FMODEX()
{
	// nothing interesting/safe to do.
}


void LLStreamingAudio_FMODEX::start(const std::string& url)
{
	//if (!mInited)
	//{
	//	llwarns << "startInternetStream before audio initialized" << llendl;
	//	return;
	//}

	// "stop" stream but don't clear url, etc. in case url == mInternetStreamURL
	stop();

	if (!url.empty())
	{
		llinfos << "Starting internet stream: " << url << llendl;
		mCurrentInternetStreamp = new LLAudioStreamManagerFMODEX(mSystem,url);
		mURL = url;
	}
	else
	{
		llinfos << "Set internet stream to null" << llendl;
		mURL.clear();
	}
}


void LLStreamingAudio_FMODEX::update()
{
	// Kill dead internet streams, if possible
	std::list<LLAudioStreamManagerFMODEX *>::iterator iter;
	for (iter = mDeadStreams.begin(); iter != mDeadStreams.end();)
	{
		LLAudioStreamManagerFMODEX *streamp = *iter;
		if (streamp->stopStream())
		{
			llinfos << "Closed dead stream" << llendl;
			delete streamp;
			mDeadStreams.erase(iter++);
		}
		else
		{
			iter++;
		}
	}

	// Don't do anything if there are no streams playing
	if (!mCurrentInternetStreamp)
	{
		return;
	}

	unsigned int progress;
	bool starving;
	bool diskbusy;
	FMOD_OPENSTATE open_state = mCurrentInternetStreamp->getOpenState(&progress, &starving, &diskbusy);

	if (open_state == FMOD_OPENSTATE_READY)
	{
		// Stream is live

		// start the stream if it's ready
		if (!mFMODInternetStreamChannelp &&
			(mFMODInternetStreamChannelp = mCurrentInternetStreamp->startStream()))
		{
			// Reset volume to previously set volume
			setGain(getGain());
			mFMODInternetStreamChannelp->setPaused(false);
		}
	}
	else if(open_state == FMOD_OPENSTATE_ERROR)
	{
		stop();
		return;
	}

	if(mFMODInternetStreamChannelp)
	{
		FMOD::Sound *sound = NULL;

		if(mFMODInternetStreamChannelp->getCurrentSound(&sound) == FMOD_OK && sound)
		{
			FMOD_TAG tag;
			S32 tagcount, dirtytagcount;

			if(sound->getNumTags(&tagcount, &dirtytagcount) == FMOD_OK && dirtytagcount)
			{
				for(S32 i = 0; i < tagcount; ++i)
				{
					if(sound->getTag(NULL, i, &tag)!=FMOD_OK)
						continue;

					if (tag.type == FMOD_TAGTYPE_FMOD)
					{
						if (!strcmp(tag.name, "Sample Rate Change"))
						{
							llinfos << "Stream forced changing sample rate to " << *((float *)tag.data) << llendl;
							mFMODInternetStreamChannelp->setFrequency(*((float *)tag.data));
						}
						continue;
					}
				}
			}

			if(starving)
			{
				bool paused = false;
				mFMODInternetStreamChannelp->getPaused(&paused);
				if(!paused)
				{
					llinfos << "Stream starvation detected! Pausing stream until buffer nearly full." << llendl;
					llinfos << "  (diskbusy="<<diskbusy<<")" << llendl;
					llinfos << "  (progress="<<progress<<")" << llendl;
					mFMODInternetStreamChannelp->setPaused(true);
				}
			}
			else if(progress > 80)
			{
				mFMODInternetStreamChannelp->setPaused(false);
			}
		}
	}
}

void LLStreamingAudio_FMODEX::stop()
{
	if (mFMODInternetStreamChannelp)
	{
		mFMODInternetStreamChannelp->setPaused(true);
		mFMODInternetStreamChannelp->setPriority(0);
		mFMODInternetStreamChannelp = NULL;
	}

	if (mCurrentInternetStreamp)
	{
		llinfos << "Stopping internet stream: " << mCurrentInternetStreamp->getURL() << llendl;
		if (mCurrentInternetStreamp->stopStream())
		{
			delete mCurrentInternetStreamp;
		}
		else
		{
			llwarns << "Pushing stream to dead list: " << mCurrentInternetStreamp->getURL() << llendl;
			mDeadStreams.push_back(mCurrentInternetStreamp);
		}
		mCurrentInternetStreamp = NULL;
		//mURL.clear();
	}
}

void LLStreamingAudio_FMODEX::pause(int pauseopt)
{
	if (pauseopt < 0)
	{
		pauseopt = mCurrentInternetStreamp ? 1 : 0;
	}

	if (pauseopt)
	{
		if (mCurrentInternetStreamp)
		{
			stop();
		}
	}
	else
	{
		start(getURL());
	}
}


// A stream is "playing" if it has been requested to start.  That
// doesn't necessarily mean audio is coming out of the speakers.
int LLStreamingAudio_FMODEX::isPlaying()
{
	if (mCurrentInternetStreamp)
	{
		return 1; // Active and playing
	}
	else if (!mURL.empty())
	{
		return 2; // "Paused"
	}
	else
	{
		return 0;
	}
}


F32 LLStreamingAudio_FMODEX::getGain()
{
	return mGain;
}


std::string LLStreamingAudio_FMODEX::getURL()
{
	return mURL;
}


void LLStreamingAudio_FMODEX::setGain(F32 vol)
{
	mGain = vol;

	if (mFMODInternetStreamChannelp)
	{
		vol = llclamp(vol * vol, 0.f, 1.f);	//should vol be squared here?

		mFMODInternetStreamChannelp->setVolume(vol);
	}
}

///////////////////////////////////////////////////////
// manager of possibly-multiple internet audio streams

LLAudioStreamManagerFMODEX::LLAudioStreamManagerFMODEX(FMOD::System *system, const std::string& url) :
	mSystem(system),
	mStreamChannel(NULL),
	mInternetStream(NULL),
	mReady(false)
{
	mInternetStreamURL = url;

	FMOD_RESULT result = mSystem->createStream(url.c_str(), FMOD_2D | FMOD_NONBLOCKING | FMOD_IGNORETAGS, 0, &mInternetStream);

	if (result!= FMOD_OK)
	{
		llwarns << "Couldn't open fmod stream, error "
			<< FMOD_ErrorString(result)
			<< llendl;
		mReady = false;
		return;
	}

	mReady = true;
}

FMOD::Channel *LLAudioStreamManagerFMODEX::startStream()
{
	// We need a live and opened stream before we try and play it.
	if (!mInternetStream || getOpenState() != FMOD_OPENSTATE_READY)
	{
		llwarns << "No internet stream to start playing!" << llendl;
		return NULL;
	}

	if(mStreamChannel)
		return mStreamChannel;	//Already have a channel for this stream.

	mSystem->playSound(FMOD_CHANNEL_FREE, mInternetStream, true, &mStreamChannel);
	return mStreamChannel;
}

bool LLAudioStreamManagerFMODEX::stopStream()
{
	if (mInternetStream)
	{


		bool close = true;
		switch (getOpenState())
		{
		case FMOD_OPENSTATE_CONNECTING:
			close = false;
			break;
		default:
			close = true;
		}

		if (close)
		{
			mInternetStream->release();
			mStreamChannel = NULL;
			mInternetStream = NULL;
			return true;
		}
		else
		{
			return false;
		}
	}
	else
	{
		return true;
	}
}

FMOD_OPENSTATE LLAudioStreamManagerFMODEX::getOpenState(unsigned int* percentbuffered, bool* starving, bool* diskbusy)
{
	FMOD_OPENSTATE state;
	mInternetStream->getOpenState(&state, percentbuffered, starving, diskbusy);
	return state;
}

void LLStreamingAudio_FMODEX::setBufferSizes(U32 streambuffertime, U32 decodebuffertime)
{
	mSystem->setStreamBufferSize(streambuffertime/1000*128*128, FMOD_TIMEUNIT_RAWBYTES);
	FMOD_ADVANCEDSETTINGS settings;
	memset(&settings,0,sizeof(settings));
	settings.cbsize=sizeof(settings);
	settings.defaultDecodeBufferSize = decodebuffertime;//ms
	mSystem->setAdvancedSettings(&settings);
}