WebMWriter.cpp@ 77863

Last change on this file since 77863 was 76760, checked in by vboxsync, 6 years ago
Main/Recording: thin out the excessive includes so that it doesn't hide missing includes in totally unrelated code, and adjust that code to do the right thing
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 29.0 KB

Line
1	/* $Id: WebMWriter.cpp 76760 2019-01-10 18:07:47Z vboxsync $ */
2	/** @file
3	* WebMWriter.cpp - WebM container handling.
4	*/
5
6	/*
7	* Copyright (C) 2013-2019 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/**
19	* For more information, see:
20	* - https://w3c.github.io/media-source/webm-byte-stream-format.html
21	* - https://www.webmproject.org/docs/container/#muxer-guidelines
22	*/
23
24	#define LOG_GROUP LOG_GROUP_MAIN_DISPLAY
25	#include "LoggingNew.h"
26
27	#include <iprt/cdefs.h>
28	#include <iprt/critsect.h>
29	#include <iprt/errcore.h>
30	#include <iprt/file.h>
31	#include <iprt/buildconfig.h>
32
33	#include <VBox/log.h>
34	#include <VBox/version.h>
35
36	#include "WebMWriter.h"
37	#include "EBML_MKV.h"
38
39
40	WebMWriter::WebMWriter(void)
41	{
42	/* Size (in bytes) of time code to write. We use 2 bytes (16 bit) by default. */
43	m_cbTimecode = 2;
44	m_uTimecodeMax = UINT16_MAX;
45
46	m_fInTracksSection = false;
47	}
48
49	WebMWriter::~WebMWriter(void)
50	{
51	Close();
52	}
53
54	/**
55	* Opens (creates) an output file using an already open file handle.
56	*
57	* @returns VBox status code.
58	* @param a_pszFilename Name of the file the file handle points at.
59	* @param a_phFile Pointer to open file handle to use.
60	* @param a_enmAudioCodec Audio codec to use.
61	* @param a_enmVideoCodec Video codec to use.
62	*/
63	int WebMWriter::OpenEx(const char *a_pszFilename, PRTFILE a_phFile,
64	WebMWriter::AudioCodec a_enmAudioCodec, WebMWriter::VideoCodec a_enmVideoCodec)
65	{
66	try
67	{
68	m_enmAudioCodec = a_enmAudioCodec;
69	m_enmVideoCodec = a_enmVideoCodec;
70
71	LogFunc(("Creating '%s'\n", a_pszFilename));
72
73	int rc = createEx(a_pszFilename, a_phFile);
74	if (RT_SUCCESS(rc))
75	{
76	rc = init();
77	if (RT_SUCCESS(rc))
78	rc = writeHeader();
79	}
80	}
81	catch(int rc)
82	{
83	return rc;
84	}
85	return VINF_SUCCESS;
86	}
87
88	/**
89	* Opens an output file.
90	*
91	* @returns VBox status code.
92	* @param a_pszFilename Name of the file to create.
93	* @param a_fOpen File open mode of type RTFILE_O_.
94	* @param a_enmAudioCodec Audio codec to use.
95	* @param a_enmVideoCodec Video codec to use.
96	*/
97	int WebMWriter::Open(const char *a_pszFilename, uint64_t a_fOpen,
98	WebMWriter::AudioCodec a_enmAudioCodec, WebMWriter::VideoCodec a_enmVideoCodec)
99	{
100	try
101	{
102	m_enmAudioCodec = a_enmAudioCodec;
103	m_enmVideoCodec = a_enmVideoCodec;
104
105	LogFunc(("Creating '%s'\n", a_pszFilename));
106
107	int rc = create(a_pszFilename, a_fOpen);
108	if (RT_SUCCESS(rc))
109	{
110	rc = init();
111	if (RT_SUCCESS(rc))
112	rc = writeHeader();
113	}
114	}
115	catch(int rc)
116	{
117	return rc;
118	}
119	return VINF_SUCCESS;
120	}
121
122	/**
123	* Closes the WebM file and drains all queues.
124	*
125	* @returns IPRT status code.
126	*/
127	int WebMWriter::Close(void)
128	{
129	LogFlowFuncEnter();
130
131	if (!isOpen())
132	return VINF_SUCCESS;
133
134	/* Make sure to drain all queues. */
135	processQueue(&CurSeg.queueBlocks, true /* fForce */);
136
137	writeFooter();
138
139	WebMTracks::iterator itTrack = CurSeg.mapTracks.begin();
140	while (itTrack != CurSeg.mapTracks.end())
141	{
142	WebMTrack *pTrack = itTrack->second;
143	if (pTrack) /* Paranoia. */
144	delete pTrack;
145
146	CurSeg.mapTracks.erase(itTrack);
147
148	itTrack = CurSeg.mapTracks.begin();
149	}
150
151	Assert(CurSeg.queueBlocks.Map.size() == 0);
152	Assert(CurSeg.mapTracks.size() == 0);
153
154	com::Utf8Str strFileName = getFileName().c_str();
155
156	close();
157
158	int rc = VINF_SUCCESS;
159
160	/* If no clusters (= data) was written, delete the file again. */
161	if (!CurSeg.cClusters)
162	rc = RTFileDelete(strFileName.c_str());
163
164	LogFlowFuncLeaveRC(rc);
165	return rc;
166	}
167
168	/**
169	* Adds an audio track.
170	*
171	* @returns IPRT status code.
172	* @param uHz Input sampling rate.
173	* Must be supported by the selected audio codec.
174	* @param cChannels Number of input audio channels.
175	* @param cBits Number of input bits per channel.
176	* @param puTrack Track number on successful creation. Optional.
177	*/
178	int WebMWriter::AddAudioTrack(uint16_t uHz, uint8_t cChannels, uint8_t cBits, uint8_t *puTrack)
179	{
180	#ifdef VBOX_WITH_LIBOPUS
181	AssertReturn(uHz, VERR_INVALID_PARAMETER);
182	AssertReturn(cBits, VERR_INVALID_PARAMETER);
183	AssertReturn(cChannels, VERR_INVALID_PARAMETER);
184
185	/*
186	* Adjust the handed-in Hz rate to values which are supported by the Opus codec.
187	*
188	* Only the following values are supported by an Opus standard build
189	* -- every other rate only is supported by a custom build.
190	*
191	* See opus_encoder_create() for more information.
192	*/
193	if (uHz > 24000) uHz = 48000;
194	else if (uHz > 16000) uHz = 24000;
195	else if (uHz > 12000) uHz = 16000;
196	else if (uHz > 8000 ) uHz = 12000;
197	else uHz = 8000;
198
199	/* Some players (e.g. Firefox with Nestegg) rely on track numbers starting at 1.
200	* Using a track number 0 will show those files as being corrupted. */
201	const uint8_t uTrack = (uint8_t)CurSeg.mapTracks.size() + 1;
202
203	subStart(MkvElem_TrackEntry);
204
205	serializeUnsignedInteger(MkvElem_TrackNumber, (uint8_t)uTrack);
206	serializeString (MkvElem_Language, "und" /* "Undefined"; see ISO-639-2. */);
207	serializeUnsignedInteger(MkvElem_FlagLacing, (uint8_t)0);
208
209	WebMTrack *pTrack = new WebMTrack(WebMTrackType_Audio, uTrack, RTFileTell(getFile()));
210
211	pTrack->Audio.uHz = uHz;
212	pTrack->Audio.msPerBlock = 20; /** Opus uses 20ms by default. Make this configurable? */
213	pTrack->Audio.framesPerBlock = uHz / (1000 /* s in ms */ / pTrack->Audio.msPerBlock);
214
215	WEBMOPUSPRIVDATA opusPrivData(uHz, cChannels);
216
217	LogFunc(("Opus @ %RU16Hz (%RU16ms + %RU16 frames per block)\n",
218	pTrack->Audio.uHz, pTrack->Audio.msPerBlock, pTrack->Audio.framesPerBlock));
219
220	serializeUnsignedInteger(MkvElem_TrackUID, pTrack->uUUID, 4)
221	.serializeUnsignedInteger(MkvElem_TrackType, 2 /* Audio */)
222	.serializeString(MkvElem_CodecID, "A_OPUS")
223	.serializeData(MkvElem_CodecPrivate, &opusPrivData, sizeof(opusPrivData))
224	.serializeUnsignedInteger(MkvElem_CodecDelay, 0)
225	.serializeUnsignedInteger(MkvElem_SeekPreRoll, 80 * 1000000) /* 80ms in ns. */
226	.subStart(MkvElem_Audio)
227	.serializeFloat(MkvElem_SamplingFrequency, (float)uHz)
228	.serializeUnsignedInteger(MkvElem_Channels, cChannels)
229	.serializeUnsignedInteger(MkvElem_BitDepth, cBits)
230	.subEnd(MkvElem_Audio)
231	.subEnd(MkvElem_TrackEntry);
232
233	CurSeg.mapTracks[uTrack] = pTrack;
234
235	if (puTrack)
236	*puTrack = uTrack;
237
238	return VINF_SUCCESS;
239	#else
240	RT_NOREF(uHz, cChannels, cBits, puTrack);
241	return VERR_NOT_SUPPORTED;
242	#endif
243	}
244
245	/**
246	* Adds a video track.
247	*
248	* @returns IPRT status code.
249	* @param uWidth Width (in pixels) of the video track.
250	* @param uHeight Height (in pixels) of the video track.
251	* @param uFPS FPS (Frames Per Second) of the video track.
252	* @param puTrack Track number of the added video track on success. Optional.
253	*/
254	int WebMWriter::AddVideoTrack(uint16_t uWidth, uint16_t uHeight, uint32_t uFPS, uint8_t *puTrack)
255	{
256	#ifdef VBOX_WITH_LIBVPX
257	/* Some players (e.g. Firefox with Nestegg) rely on track numbers starting at 1.
258	* Using a track number 0 will show those files as being corrupted. */
259	const uint8_t uTrack = (uint8_t)CurSeg.mapTracks.size() + 1;
260
261	subStart(MkvElem_TrackEntry);
262
263	serializeUnsignedInteger(MkvElem_TrackNumber, (uint8_t)uTrack);
264	serializeString (MkvElem_Language, "und" /* "Undefined"; see ISO-639-2. */);
265	serializeUnsignedInteger(MkvElem_FlagLacing, (uint8_t)0);
266
267	WebMTrack *pTrack = new WebMTrack(WebMTrackType_Video, uTrack, RTFileTell(getFile()));
268
269	/** @todo Resolve codec type. */
270	serializeUnsignedInteger(MkvElem_TrackUID, pTrack->uUUID /* UID */, 4)
271	.serializeUnsignedInteger(MkvElem_TrackType, 1 /* Video */)
272	.serializeString(MkvElem_CodecID, "V_VP8")
273	.subStart(MkvElem_Video)
274	.serializeUnsignedInteger(MkvElem_PixelWidth, uWidth)
275	.serializeUnsignedInteger(MkvElem_PixelHeight, uHeight)
276	/* Some players rely on the FPS rate for timing calculations.
277	* So make sure to always include that. */
278	.serializeFloat (MkvElem_FrameRate, (float)uFPS)
279	.subEnd(MkvElem_Video);
280
281	subEnd(MkvElem_TrackEntry);
282
283	CurSeg.mapTracks[uTrack] = pTrack;
284
285	if (puTrack)
286	*puTrack = uTrack;
287
288	return VINF_SUCCESS;
289	#else
290	RT_NOREF(uWidth, uHeight, dbFPS, puTrack);
291	return VERR_NOT_SUPPORTED;
292	#endif
293	}
294
295	/**
296	* Gets file name.
297	*
298	* @returns File name as UTF-8 string.
299	*/
300	const com::Utf8Str& WebMWriter::GetFileName(void)
301	{
302	return getFileName();
303	}
304
305	/**
306	* Gets current output file size.
307	*
308	* @returns File size in bytes.
309	*/
310	uint64_t WebMWriter::GetFileSize(void)
311	{
312	return getFileSize();
313	}
314
315	/**
316	* Gets current free storage space available for the file.
317	*
318	* @returns Available storage free space.
319	*/
320	uint64_t WebMWriter::GetAvailableSpace(void)
321	{
322	return getAvailableSpace();
323	}
324
325	/**
326	* Takes care of the initialization of the instance.
327	*
328	* @returns IPRT status code.
329	*/
330	int WebMWriter::init(void)
331	{
332	return CurSeg.init();
333	}
334
335	/**
336	* Takes care of the destruction of the instance.
337	*/
338	void WebMWriter::destroy(void)
339	{
340	CurSeg.uninit();
341	}
342
343	/**
344	* Writes the WebM file header.
345	*
346	* @returns IPRT status code.
347	*/
348	int WebMWriter::writeHeader(void)
349	{
350	LogFunc(("Header @ %RU64\n", RTFileTell(getFile())));
351
352	subStart(MkvElem_EBML)
353	.serializeUnsignedInteger(MkvElem_EBMLVersion, 1)
354	.serializeUnsignedInteger(MkvElem_EBMLReadVersion, 1)
355	.serializeUnsignedInteger(MkvElem_EBMLMaxIDLength, 4)
356	.serializeUnsignedInteger(MkvElem_EBMLMaxSizeLength, 8)
357	.serializeString(MkvElem_DocType, "webm")
358	.serializeUnsignedInteger(MkvElem_DocTypeVersion, 2)
359	.serializeUnsignedInteger(MkvElem_DocTypeReadVersion, 2)
360	.subEnd(MkvElem_EBML);
361
362	subStart(MkvElem_Segment);
363
364	/* Save offset of current segment. */
365	CurSeg.offStart = RTFileTell(getFile());
366
367	writeSeekHeader();
368
369	/* Save offset of upcoming tracks segment. */
370	CurSeg.offTracks = RTFileTell(getFile());
371
372	/* The tracks segment starts right after this header. */
373	subStart(MkvElem_Tracks);
374	m_fInTracksSection = true;
375
376	return VINF_SUCCESS;
377	}
378
379	/**
380	* Writes a simple block into the EBML structure.
381	*
382	* @returns IPRT status code.
383	* @param a_pTrack Track the simple block is assigned to.
384	* @param a_pBlock Simple block to write.
385	*/
386	int WebMWriter::writeSimpleBlockEBML(WebMTrack a_pTrack, WebMSimpleBlock a_pBlock)
387	{
388	#ifdef LOG_ENABLED
389	WebMCluster &Cluster = CurSeg.CurCluster;
390
391	Log3Func(("[T%RU8C%RU64] Off=%RU64, AbsPTSMs=%RU64, RelToClusterMs=%RU16, %zu bytes\n",
392	a_pTrack->uTrack, Cluster.uID, RTFileTell(getFile()),
393	a_pBlock->Data.tcAbsPTSMs, a_pBlock->Data.tcRelToClusterMs, a_pBlock->Data.cb));
394	#endif
395	/*
396	* Write a "Simple Block".
397	*/
398	writeClassId(MkvElem_SimpleBlock);
399	/* Block size. */
400	writeUnsignedInteger(0x10000000u \| ( 1 /* Track number size. */
401	+ m_cbTimecode /* Timecode size .*/
402	+ 1 /* Flags size. */
403	+ a_pBlock->Data.cb /* Actual frame data size. */), 4);
404	/* Track number. */
405	writeSize(a_pTrack->uTrack);
406	/* Timecode (relative to cluster opening timecode). */
407	writeUnsignedInteger(a_pBlock->Data.tcRelToClusterMs, m_cbTimecode);
408	/* Flags. */
409	writeUnsignedInteger(a_pBlock->Data.fFlags, 1);
410	/* Frame data. */
411	write(a_pBlock->Data.pv, a_pBlock->Data.cb);
412
413	return VINF_SUCCESS;
414	}
415
416	/**
417	* Writes a simple block and enqueues it into the segment's render queue.
418	*
419	* @returns IPRT status code.
420	* @param a_pTrack Track the simple block is assigned to.
421	* @param a_pBlock Simple block to write and enqueue.
422	*/
423	int WebMWriter::writeSimpleBlockQueued(WebMTrack a_pTrack, WebMSimpleBlock a_pBlock)
424	{
425	RT_NOREF(a_pTrack);
426
427	int rc = VINF_SUCCESS;
428
429	try
430	{
431	const WebMTimecodeAbs tcAbsPTS = a_pBlock->Data.tcAbsPTSMs;
432
433	/* See if we already have an entry for the specified timecode in our queue. */
434	WebMBlockMap::iterator itQueue = CurSeg.queueBlocks.Map.find(tcAbsPTS);
435	if (itQueue != CurSeg.queueBlocks.Map.end()) /* Use existing queue. */
436	{
437	WebMTimecodeBlocks &Blocks = itQueue->second;
438	Blocks.Enqueue(a_pBlock);
439	}
440	else /* Create a new timecode entry. */
441	{
442	WebMTimecodeBlocks Blocks;
443	Blocks.Enqueue(a_pBlock);
444
445	CurSeg.queueBlocks.Map[tcAbsPTS] = Blocks;
446	}
447
448	rc = processQueue(&CurSeg.queueBlocks, false /* fForce */);
449	}
450	catch(...)
451	{
452	delete a_pBlock;
453	a_pBlock = NULL;
454
455	rc = VERR_NO_MEMORY;
456	}
457
458	return rc;
459	}
460
461	#ifdef VBOX_WITH_LIBVPX
462	/**
463	* Writes VPX (VP8 video) simple data block.
464	*
465	* @returns IPRT status code.
466	* @param a_pTrack Track ID to write data to.
467	* @param a_pCfg VPX encoder configuration to use.
468	* @param a_pPkt VPX packet video data packet to write.
469	*/
470	int WebMWriter::writeSimpleBlockVP8(WebMTrack a_pTrack, const vpx_codec_enc_cfg_t a_pCfg, const vpx_codec_cx_pkt_t *a_pPkt)
471	{
472	RT_NOREF(a_pTrack);
473
474	/* Calculate the absolute PTS of this frame (in ms). */
475	WebMTimecodeAbs tcAbsPTSMs = a_pPkt->data.frame.pts * 1000
476	* (uint64_t) a_pCfg->g_timebase.num / a_pCfg->g_timebase.den;
477	if ( tcAbsPTSMs
478	&& tcAbsPTSMs <= a_pTrack->tcAbsLastWrittenMs)
479	{
480	AssertFailed(); /* Should never happen. */
481	tcAbsPTSMs = a_pTrack->tcAbsLastWrittenMs + 1;
482	}
483
484	const bool fKeyframe = RT_BOOL(a_pPkt->data.frame.flags & VPX_FRAME_IS_KEY);
485
486	uint8_t fFlags = VBOX_WEBM_BLOCK_FLAG_NONE;
487	if (fKeyframe)
488	fFlags \|= VBOX_WEBM_BLOCK_FLAG_KEY_FRAME;
489	if (a_pPkt->data.frame.flags & VPX_FRAME_IS_INVISIBLE)
490	fFlags \|= VBOX_WEBM_BLOCK_FLAG_INVISIBLE;
491
492	return writeSimpleBlockQueued(a_pTrack,
493	new WebMSimpleBlock(a_pTrack,
494	tcAbsPTSMs, a_pPkt->data.frame.buf, a_pPkt->data.frame.sz, fFlags));
495	}
496	#endif /* VBOX_WITH_LIBVPX */
497
498	#ifdef VBOX_WITH_LIBOPUS
499	/**
500	* Writes an Opus (audio) simple data block.
501	*
502	* @returns IPRT status code.
503	* @param a_pTrack Track ID to write data to.
504	* @param pvData Pointer to simple data block to write.
505	* @param cbData Size (in bytes) of simple data block to write.
506	* @param tcAbsPTSMs Absolute PTS of simple data block.
507	*
508	* @remarks Audio blocks that have same absolute timecode as video blocks SHOULD be written before the video blocks.
509	*/
510	int WebMWriter::writeSimpleBlockOpus(WebMTrack a_pTrack, const void pvData, size_t cbData, WebMTimecodeAbs tcAbsPTSMs)
511	{
512	AssertPtrReturn(a_pTrack, VERR_INVALID_POINTER);
513	AssertPtrReturn(pvData, VERR_INVALID_POINTER);
514	AssertReturn(cbData, VERR_INVALID_PARAMETER);
515
516	/* Every Opus frame is a key frame. */
517	const uint8_t fFlags = VBOX_WEBM_BLOCK_FLAG_KEY_FRAME;
518
519	return writeSimpleBlockQueued(a_pTrack,
520	new WebMSimpleBlock(a_pTrack, tcAbsPTSMs, pvData, cbData, fFlags));
521	}
522	#endif /* VBOX_WITH_LIBOPUS */
523
524	/**
525	* Writes a data block to the specified track.
526	*
527	* @returns IPRT status code.
528	* @param uTrack Track ID to write data to.
529	* @param pvData Pointer to data block to write.
530	* @param cbData Size (in bytes) of data block to write.
531	*/
532	int WebMWriter::WriteBlock(uint8_t uTrack, const void *pvData, size_t cbData)
533	{
534	RT_NOREF(cbData); /* Only needed for assertions for now. */
535
536	int rc = RTCritSectEnter(&CurSeg.CritSect);
537	AssertRC(rc);
538
539	WebMTracks::iterator itTrack = CurSeg.mapTracks.find(uTrack);
540	if (itTrack == CurSeg.mapTracks.end())
541	{
542	RTCritSectLeave(&CurSeg.CritSect);
543	return VERR_NOT_FOUND;
544	}
545
546	WebMTrack *pTrack = itTrack->second;
547	AssertPtr(pTrack);
548
549	if (m_fInTracksSection)
550	{
551	subEnd(MkvElem_Tracks);
552	m_fInTracksSection = false;
553	}
554
555	switch (pTrack->enmType)
556	{
557
558	case WebMTrackType_Audio:
559	{
560	#ifdef VBOX_WITH_LIBOPUS
561	if (m_enmAudioCodec == WebMWriter::AudioCodec_Opus)
562	{
563	Assert(cbData == sizeof(WebMWriter::BlockData_Opus));
564	WebMWriter::BlockData_Opus pData = (WebMWriter::BlockData_Opus )pvData;
565	rc = writeSimpleBlockOpus(pTrack, pData->pvData, pData->cbData, pData->uPTSMs);
566	}
567	else
568	#endif /* VBOX_WITH_LIBOPUS */
569	rc = VERR_NOT_SUPPORTED;
570	break;
571	}
572
573	case WebMTrackType_Video:
574	{
575	#ifdef VBOX_WITH_LIBVPX
576	if (m_enmVideoCodec == WebMWriter::VideoCodec_VP8)
577	{
578	Assert(cbData == sizeof(WebMWriter::BlockData_VP8));
579	WebMWriter::BlockData_VP8 pData = (WebMWriter::BlockData_VP8 )pvData;
580	rc = writeSimpleBlockVP8(pTrack, pData->pCfg, pData->pPkt);
581	}
582	else
583	#endif /* VBOX_WITH_LIBVPX */
584	rc = VERR_NOT_SUPPORTED;
585	break;
586	}
587
588	default:
589	rc = VERR_NOT_SUPPORTED;
590	break;
591	}
592
593	int rc2 = RTCritSectLeave(&CurSeg.CritSect);
594	AssertRC(rc2);
595
596	return rc;
597	}
598
599	/**
600	* Processes a render queue.
601	*
602	* @returns IPRT status code.
603	* @param pQueue Queue to process.
604	* @param fForce Whether forcing to process the render queue or not.
605	* Needed to drain the queues when terminating.
606	*/
607	int WebMWriter::processQueue(WebMQueue *pQueue, bool fForce)
608	{
609	if (pQueue->tsLastProcessedMs == 0)
610	pQueue->tsLastProcessedMs = RTTimeMilliTS();
611
612	if (!fForce)
613	{
614	/* Only process when we reached a certain threshold. */
615	if (RTTimeMilliTS() - pQueue->tsLastProcessedMs < 5000 /* ms / /* @todo Make this configurable */)
616	return VINF_SUCCESS;
617	}
618
619	WebMCluster &Cluster = CurSeg.CurCluster;
620
621	/* Iterate through the block map. */
622	WebMBlockMap::iterator it = pQueue->Map.begin();
623	while (it != CurSeg.queueBlocks.Map.end())
624	{
625	WebMTimecodeAbs mapAbsPTSMs = it->first;
626	WebMTimecodeBlocks mapBlocks = it->second;
627
628	/* Whether to start a new cluster or not. */
629	bool fClusterStart = false;
630
631	/* If the current segment does not have any clusters (yet),
632	* take the first absolute PTS as the starting point for that segment. */
633	if (CurSeg.cClusters == 0)
634	{
635	CurSeg.tcAbsStartMs = mapAbsPTSMs;
636	fClusterStart = true;
637	}
638
639	/* Determine if we need to start a new cluster. */
640	/* No blocks written yet? Start a new cluster. */
641	if ( Cluster.cBlocks == 0
642	/* Did we reach the maximum a cluster can hold? Use a new cluster then. */
643	\|\| mapAbsPTSMs - Cluster.tcAbsStartMs > VBOX_WEBM_CLUSTER_MAX_LEN_MS
644	/* If the block map indicates that a cluster is needed for this timecode, create one. */
645	\|\| mapBlocks.fClusterNeeded)
646	{
647	fClusterStart = true;
648	}
649
650	if ( fClusterStart
651	&& !mapBlocks.fClusterStarted)
652	{
653	/* Last written timecode of the current cluster. */
654	uint64_t tcAbsClusterLastWrittenMs;
655
656	if (Cluster.fOpen) /* Close current cluster first. */
657	{
658	Log2Func(("[C%RU64] End @ %RU64ms (duration = %RU64ms)\n",
659	Cluster.uID, Cluster.tcAbsLastWrittenMs, Cluster.tcAbsLastWrittenMs - Cluster.tcAbsStartMs));
660
661	/* Make sure that the current cluster contained some data. */
662	Assert(Cluster.offStart);
663	Assert(Cluster.cBlocks);
664
665	/* Save the last written timecode of the current cluster before closing it. */
666	tcAbsClusterLastWrittenMs = Cluster.tcAbsLastWrittenMs;
667
668	subEnd(MkvElem_Cluster);
669	Cluster.fOpen = false;
670	}
671	else /* First cluster ever? Use the segment's starting timecode. */
672	tcAbsClusterLastWrittenMs = CurSeg.tcAbsStartMs;
673
674	Cluster.fOpen = true;
675	Cluster.uID = CurSeg.cClusters;
676	/* Use the block map's currently processed TC as the cluster's starting TC. */
677	Cluster.tcAbsStartMs = mapAbsPTSMs;
678	Cluster.tcAbsLastWrittenMs = Cluster.tcAbsStartMs;
679	Cluster.offStart = RTFileTell(getFile());
680	Cluster.cBlocks = 0;
681
682	AssertMsg(Cluster.tcAbsStartMs <= mapAbsPTSMs,
683	("Cluster #%RU64 start TC (%RU64) must not bigger than the block map's currently processed TC (%RU64)\n",
684	Cluster.uID, Cluster.tcAbsStartMs, mapAbsPTSMs));
685
686	Log2Func(("[C%RU64] Start @ %RU64ms (map TC is %RU64) / %RU64 bytes\n",
687	Cluster.uID, Cluster.tcAbsStartMs, mapAbsPTSMs, Cluster.offStart));
688
689	/* Insert cue points for all tracks if a new cluster has been started. */
690	WebMCuePoint *pCuePoint = new WebMCuePoint(Cluster.tcAbsStartMs);
691
692	WebMTracks::iterator itTrack = CurSeg.mapTracks.begin();
693	while (itTrack != CurSeg.mapTracks.end())
694	{
695	pCuePoint->Pos[itTrack->first] = new WebMCueTrackPosEntry(Cluster.offStart);
696	++itTrack;
697	}
698
699	CurSeg.lstCuePoints.push_back(pCuePoint);
700
701	subStart(MkvElem_Cluster)
702	.serializeUnsignedInteger(MkvElem_Timecode, Cluster.tcAbsStartMs - CurSeg.tcAbsStartMs);
703
704	CurSeg.cClusters++;
705
706	mapBlocks.fClusterStarted = true;
707	}
708
709	Log2Func(("[C%RU64] SegTcAbsStartMs=%RU64, ClusterTcAbsStartMs=%RU64, ClusterTcAbsLastWrittenMs=%RU64, mapAbsPTSMs=%RU64\n",
710	Cluster.uID, CurSeg.tcAbsStartMs, Cluster.tcAbsStartMs, Cluster.tcAbsLastWrittenMs, mapAbsPTSMs));
711
712	/* Iterate through all blocks related to the current timecode. */
713	while (!mapBlocks.Queue.empty())
714	{
715	WebMSimpleBlock *pBlock = mapBlocks.Queue.front();
716	AssertPtr(pBlock);
717
718	WebMTrack *pTrack = pBlock->pTrack;
719	AssertPtr(pTrack);
720
721	/* Calculate the block's relative time code to the current cluster's starting time code. */
722	Assert(pBlock->Data.tcAbsPTSMs >= Cluster.tcAbsStartMs);
723	pBlock->Data.tcRelToClusterMs = pBlock->Data.tcAbsPTSMs - Cluster.tcAbsStartMs;
724
725	int rc2 = writeSimpleBlockEBML(pTrack, pBlock);
726	AssertRC(rc2);
727
728	Cluster.cBlocks++;
729	Cluster.tcAbsLastWrittenMs = pBlock->Data.tcAbsPTSMs;
730
731	pTrack->cTotalBlocks++;
732	pTrack->tcAbsLastWrittenMs = Cluster.tcAbsLastWrittenMs;
733
734	if (CurSeg.tcAbsLastWrittenMs < pTrack->tcAbsLastWrittenMs)
735	CurSeg.tcAbsLastWrittenMs = pTrack->tcAbsLastWrittenMs;
736
737	/* Save a cue point if this is a keyframe (if no new cluster has been started,
738	* as this implies that a cue point already is present. */
739	if ( !fClusterStart
740	&& (pBlock->Data.fFlags & VBOX_WEBM_BLOCK_FLAG_KEY_FRAME))
741	{
742	/* Insert cue points for all tracks if a new cluster has been started. */
743	WebMCuePoint *pCuePoint = new WebMCuePoint(Cluster.tcAbsLastWrittenMs);
744
745	WebMTracks::iterator itTrack = CurSeg.mapTracks.begin();
746	while (itTrack != CurSeg.mapTracks.end())
747	{
748	pCuePoint->Pos[itTrack->first] = new WebMCueTrackPosEntry(Cluster.offStart);
749	++itTrack;
750	}
751
752	CurSeg.lstCuePoints.push_back(pCuePoint);
753	}
754
755	delete pBlock;
756	pBlock = NULL;
757
758	mapBlocks.Queue.pop();
759	}
760
761	Assert(mapBlocks.Queue.empty());
762
763	CurSeg.queueBlocks.Map.erase(it);
764
765	it = CurSeg.queueBlocks.Map.begin();
766	}
767
768	Assert(CurSeg.queueBlocks.Map.empty());
769
770	pQueue->tsLastProcessedMs = RTTimeMilliTS();
771
772	return VINF_SUCCESS;
773	}
774
775	/**
776	* Writes the WebM footer.
777	*
778	* @returns IPRT status code.
779	*/
780	int WebMWriter::writeFooter(void)
781	{
782	AssertReturn(isOpen(), VERR_WRONG_ORDER);
783
784	if (m_fInTracksSection)
785	{
786	subEnd(MkvElem_Tracks);
787	m_fInTracksSection = false;
788	}
789
790	if (CurSeg.CurCluster.fOpen)
791	{
792	subEnd(MkvElem_Cluster);
793	CurSeg.CurCluster.fOpen = false;
794	}
795
796	/*
797	* Write Cues element.
798	*/
799	CurSeg.offCues = RTFileTell(getFile());
800	LogFunc(("Cues @ %RU64\n", CurSeg.offCues));
801
802	subStart(MkvElem_Cues);
803
804	WebMCuePointList::iterator itCuePoint = CurSeg.lstCuePoints.begin();
805	while (itCuePoint != CurSeg.lstCuePoints.end())
806	{
807	WebMCuePoint pCuePoint = (itCuePoint);
808	AssertPtr(pCuePoint);
809
810	LogFunc(("CuePoint @ %RU64: %zu tracks, tcAbs=%RU64)\n",
811	RTFileTell(getFile()), pCuePoint->Pos.size(), pCuePoint->tcAbs));
812
813	subStart(MkvElem_CuePoint)
814	.serializeUnsignedInteger(MkvElem_CueTime, pCuePoint->tcAbs);
815
816	WebMCueTrackPosMap::iterator itTrackPos = pCuePoint->Pos.begin();
817	while (itTrackPos != pCuePoint->Pos.end())
818	{
819	WebMCueTrackPosEntry *pTrackPos = itTrackPos->second;
820	AssertPtr(pTrackPos);
821
822	LogFunc(("TrackPos (track #%RU32) @ %RU64, offCluster=%RU64)\n",
823	itTrackPos->first, RTFileTell(getFile()), pTrackPos->offCluster));
824
825	subStart(MkvElem_CueTrackPositions)
826	.serializeUnsignedInteger(MkvElem_CueTrack, itTrackPos->first)
827	.serializeUnsignedInteger(MkvElem_CueClusterPosition, pTrackPos->offCluster - CurSeg.offStart, 8)
828	.subEnd(MkvElem_CueTrackPositions);
829
830	++itTrackPos;
831	}
832
833	subEnd(MkvElem_CuePoint);
834
835	++itCuePoint;
836	}
837
838	subEnd(MkvElem_Cues);
839	subEnd(MkvElem_Segment);
840
841	/*
842	* Re-Update seek header with final information.
843	*/
844
845	writeSeekHeader();
846
847	return RTFileSeek(getFile(), 0, RTFILE_SEEK_END, NULL);
848	}
849
850	/**
851	* Writes the segment's seek header.
852	*/
853	void WebMWriter::writeSeekHeader(void)
854	{
855	if (CurSeg.offSeekInfo)
856	RTFileSeek(getFile(), CurSeg.offSeekInfo, RTFILE_SEEK_BEGIN, NULL);
857	else
858	CurSeg.offSeekInfo = RTFileTell(getFile());
859
860	LogFunc(("Seek Header @ %RU64\n", CurSeg.offSeekInfo));
861
862	subStart(MkvElem_SeekHead);
863
864	subStart(MkvElem_Seek)
865	.serializeUnsignedInteger(MkvElem_SeekID, MkvElem_Tracks)
866	.serializeUnsignedInteger(MkvElem_SeekPosition, CurSeg.offTracks - CurSeg.offStart, 8)
867	.subEnd(MkvElem_Seek);
868
869	if (CurSeg.offCues)
870	LogFunc(("Updating Cues @ %RU64\n", CurSeg.offCues));
871
872	subStart(MkvElem_Seek)
873	.serializeUnsignedInteger(MkvElem_SeekID, MkvElem_Cues)
874	.serializeUnsignedInteger(MkvElem_SeekPosition, CurSeg.offCues - CurSeg.offStart, 8)
875	.subEnd(MkvElem_Seek);
876
877	subStart(MkvElem_Seek)
878	.serializeUnsignedInteger(MkvElem_SeekID, MkvElem_Info)
879	.serializeUnsignedInteger(MkvElem_SeekPosition, CurSeg.offInfo - CurSeg.offStart, 8)
880	.subEnd(MkvElem_Seek);
881
882	subEnd(MkvElem_SeekHead);
883
884	/*
885	* Write the segment's info element.
886	*/
887
888	/* Save offset of the segment's info element. */
889	CurSeg.offInfo = RTFileTell(getFile());
890
891	LogFunc(("Info @ %RU64\n", CurSeg.offInfo));
892
893	char szMux[64];
894	RTStrPrintf(szMux, sizeof(szMux),
895	#ifdef VBOX_WITH_LIBVPX
896	"vpxenc%s", vpx_codec_version_str());
897	#else
898	"unknown");
899	#endif
900	char szApp[64];
901	RTStrPrintf(szApp, sizeof(szApp), VBOX_PRODUCT " %sr%u", VBOX_VERSION_STRING, RTBldCfgRevision());
902
903	const WebMTimecodeAbs tcAbsDurationMs = CurSeg.tcAbsLastWrittenMs - CurSeg.tcAbsStartMs;
904
905	if (!CurSeg.lstCuePoints.empty())
906	{
907	LogFunc(("tcAbsDurationMs=%RU64\n", tcAbsDurationMs));
908	AssertMsg(tcAbsDurationMs, ("Segment seems to be empty (duration is 0)\n"));
909	}
910
911	subStart(MkvElem_Info)
912	.serializeUnsignedInteger(MkvElem_TimecodeScale, CurSeg.uTimecodeScaleFactor)
913	.serializeFloat(MkvElem_Segment_Duration, tcAbsDurationMs)
914	.serializeString(MkvElem_MuxingApp, szMux)
915	.serializeString(MkvElem_WritingApp, szApp)
916	.subEnd(MkvElem_Info);
917	}
918

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/Main/src-client/WebMWriter.cpp@ 77863

Download in other formats: