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
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
|
/*
* Copyright (C) 2010-2015 Hendrik Leppkes
* http://www.1f0.de
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "stdafx.h"
#include "LAVAudio.h"
#include <MMReg.h>
#include "moreuuids.h"
#define LAV_BITSTREAM_BUFFER_SIZE 4096
#define LAV_BITSTREAM_DTS_HD_RATE 768000
static struct {
AVCodecID codec;
LAVBitstreamCodec config;
} lavf_bitstream_config[] = {
{ AV_CODEC_ID_AC3, Bitstream_AC3 },
{ AV_CODEC_ID_EAC3, Bitstream_EAC3 },
{ AV_CODEC_ID_TRUEHD, Bitstream_TRUEHD },
{ AV_CODEC_ID_DTS, Bitstream_DTS } // DTS-HD is still DTS, and handled special below
};
// Check whether a codec is bitstreaming eligible and enabled
BOOL CLAVAudio::IsBitstreaming(AVCodecID codec)
{
for(int i = 0; i < countof(lavf_bitstream_config); ++i) {
if (lavf_bitstream_config[i].codec == codec) {
return m_settings.bBitstream[lavf_bitstream_config[i].config];
}
}
return FALSE;
}
HRESULT CLAVAudio::InitBitstreaming()
{
// Alloc buffer for the AVIO context
BYTE *buffer = (BYTE *)CoTaskMemAlloc(LAV_BITSTREAM_BUFFER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
if(!buffer)
return E_OUTOFMEMORY;
// Create AVIO context
m_avioBitstream = avio_alloc_context(buffer, LAV_BITSTREAM_BUFFER_SIZE, 1, this, nullptr, BSWriteBuffer, nullptr);
if(!m_avioBitstream) {
SAFE_CO_FREE(buffer);
return E_FAIL;
}
return S_OK;
}
HRESULT CLAVAudio::ShutdownBitstreaming()
{
if (m_avioBitstream) {
SAFE_CO_FREE(m_avioBitstream->buffer);
av_freep(&m_avioBitstream);
}
return S_OK;
}
// Static function for the AVIO context that writes the buffer into our own output buffer
int CLAVAudio::BSWriteBuffer(void *opaque, uint8_t *buf, int buf_size)
{
CLAVAudio *filter = (CLAVAudio *)opaque;
filter->m_bsOutput.Append(buf, buf_size);
return buf_size;
}
HRESULT CLAVAudio::CreateBitstreamContext(AVCodecID codec, WAVEFORMATEX *wfe)
{
int ret = 0;
if (m_avBSContext)
FreeBitstreamContext();
m_bsParser.Reset();
// Increase DTS buffer even further, as we do not have any sample caching
if (codec == AV_CODEC_ID_DTS)
m_faJitter.SetNumSamples(400);
else
m_faJitter.SetNumSamples(100);
m_pParser = av_parser_init(codec);
ASSERT(m_pParser);
m_pAVCtx = avcodec_alloc_context3(avcodec_find_decoder(codec));
CheckPointer(m_pAVCtx, E_POINTER);
DbgLog((LOG_TRACE, 20, "Creating Bistreaming Context..."));
ret = avformat_alloc_output_context2(&m_avBSContext, nullptr, "spdif", nullptr);
if (ret < 0 || !m_avBSContext) {
DbgLog((LOG_ERROR, 10, L"::CreateBitstreamContext() -- alloc of avformat spdif muxer failed (ret: %d)", ret));
goto fail;
}
m_avBSContext->pb = m_avioBitstream;
m_avBSContext->oformat->flags |= AVFMT_NOFILE;
// DTS-HD is by default off, unless explicitly asked for
if (m_settings.DTSHDFraming && m_settings.bBitstream[Bitstream_DTSHD] && !m_bForceDTSCore) {
m_bDTSHD = TRUE;
av_opt_set_int(m_avBSContext->priv_data, "dtshd_rate", LAV_BITSTREAM_DTS_HD_RATE, 0);
} else {
m_bDTSHD = FALSE;
av_opt_set_int(m_avBSContext->priv_data, "dtshd_rate", 0, 0);
}
av_opt_set_int(m_avBSContext->priv_data, "dtshd_fallback_time", -1, 0);
AVStream *st = avformat_new_stream(m_avBSContext, 0);
if (!st) {
DbgLog((LOG_ERROR, 10, L"::CreateBitstreamContext() -- alloc of output stream failed"));
goto fail;
}
m_pAVCtx->codec_id = st->codec->codec_id = codec;
m_pAVCtx->codec_type = st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
m_pAVCtx->channels = st->codec->channels = wfe->nChannels;
m_pAVCtx->sample_rate = st->codec->sample_rate = wfe->nSamplesPerSec;
ret = avformat_write_header(m_avBSContext, nullptr);
if (ret < 0) {
DbgLog((LOG_ERROR, 10, L"::CreateBitstreamContext() -- av_write_header returned an error code (%d)", -ret));
goto fail;
}
m_nCodecId = codec;
return S_OK;
fail:
FreeBitstreamContext();
return E_FAIL;
}
HRESULT CLAVAudio::UpdateBitstreamContext()
{
if (!m_pInput || !m_pInput->IsConnected())
return E_UNEXPECTED;
BOOL bBitstream = IsBitstreaming(m_nCodecId);
if ((bBitstream && !m_avBSContext) || (!bBitstream && m_avBSContext)) {
CMediaType mt = m_pInput->CurrentMediaType();
const void *format = mt.Format();
GUID format_type = mt.formattype;
DWORD formatlen = mt.cbFormat;
// Override the format type
if (mt.subtype == MEDIASUBTYPE_FFMPEG_AUDIO && format_type == FORMAT_WaveFormatExFFMPEG) {
WAVEFORMATEXFFMPEG *wfexff = (WAVEFORMATEXFFMPEG *)mt.Format();
format = &wfexff->wfex;
format_type = FORMAT_WaveFormatEx;
formatlen -= sizeof(WAVEFORMATEXFFMPEG) - sizeof(WAVEFORMATEX);
}
ffmpeg_init(m_nCodecId, format, format_type, formatlen);
m_bQueueResync = TRUE;
}
// Configure DTS-HD setting
if(m_avBSContext) {
if (m_settings.bBitstream[Bitstream_DTSHD] && m_settings.DTSHDFraming && !m_bForceDTSCore) {
m_bDTSHD = TRUE;
av_opt_set_int(m_avBSContext->priv_data, "dtshd_rate", LAV_BITSTREAM_DTS_HD_RATE, 0);
} else {
m_bDTSHD = FALSE; // Force auto-detection
av_opt_set_int(m_avBSContext->priv_data, "dtshd_rate", 0, 0);
}
}
return S_OK;
}
HRESULT CLAVAudio::FreeBitstreamContext()
{
if (m_avBSContext) {
av_write_trailer(m_avBSContext); // For the SPDIF muxer that frees the buffers
avformat_free_context(m_avBSContext);
}
m_avBSContext = nullptr;
if (m_pParser)
av_parser_close(m_pParser);
m_pParser = nullptr;
if (m_pAVCtx) {
if (m_pAVCtx->codec)
avcodec_close(m_pAVCtx);
av_freep(&m_pAVCtx->extradata);
av_freep(&m_pAVCtx);
}
// Dump any remaining data
m_bsOutput.SetSize(0);
return S_OK;
}
CMediaType CLAVAudio::CreateBitstreamMediaType(AVCodecID codec, DWORD dwSampleRate, BOOL bDTSHDOverride)
{
CMediaType mt;
mt.majortype = MEDIATYPE_Audio;
mt.subtype = MEDIASUBTYPE_PCM;
mt.formattype = FORMAT_WaveFormatEx;
WAVEFORMATEXTENSIBLE wfex;
memset(&wfex, 0, sizeof(wfex));
WAVEFORMATEX* wfe = &wfex.Format;
wfe->nChannels = 2;
wfe->wBitsPerSample = 16;
GUID subtype = GUID_NULL;
switch(codec) {
case AV_CODEC_ID_AC3:
wfe->wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF;
wfe->nSamplesPerSec = min(dwSampleRate, 48000);
break;
case AV_CODEC_ID_EAC3:
wfe->nSamplesPerSec = 192000;
wfe->nChannels = 2;
subtype = KSDATAFORMAT_SUBTYPE_IEC61937_DOLBY_DIGITAL_PLUS;
break;
case AV_CODEC_ID_TRUEHD:
wfe->nSamplesPerSec = 192000;
wfe->nChannels = 8;
subtype = KSDATAFORMAT_SUBTYPE_IEC61937_DOLBY_MLP;
break;
case AV_CODEC_ID_DTS:
if (m_settings.bBitstream[Bitstream_DTSHD] && m_bDTSHD && !bDTSHDOverride) {
wfe->nSamplesPerSec = 192000;
wfe->nChannels = 8;
subtype = KSDATAFORMAT_SUBTYPE_IEC61937_DTS_HD;
} else {
wfe->wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF; // huh? but it works.
wfe->nSamplesPerSec = min(dwSampleRate, 48000);
}
break;
default:
ASSERT(0);
break;
}
wfe->nBlockAlign = wfe->nChannels * wfe->wBitsPerSample / 8;
wfe->nAvgBytesPerSec = wfe->nSamplesPerSec * wfe->nBlockAlign;
if (subtype != GUID_NULL) {
wfex.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
wfex.Format.cbSize = sizeof(wfex) - sizeof(wfex.Format);
wfex.dwChannelMask = get_channel_mask(wfe->nChannels);
wfex.Samples.wValidBitsPerSample = wfex.Format.wBitsPerSample;
wfex.SubFormat = subtype;
}
mt.SetSampleSize(1);
mt.SetFormat((BYTE*)&wfex, sizeof(wfex.Format) + wfex.Format.cbSize);
return mt;
}
void CLAVAudio::ActivateDTSHDMuxing()
{
DbgLog((LOG_TRACE, 20, L"::ActivateDTSHDMuxing(): Found DTS-HD marker - switching to DTS-HD muxing mode"));
m_bDTSHD = TRUE;
// Check if downstream actually accepts it..
CMediaType &mt = CreateBitstreamMediaType(m_nCodecId, m_bsParser.m_dwSampleRate);
HRESULT hr = m_pOutput->GetConnected()->QueryAccept(&mt);
if (hr != S_OK) {
DbgLog((LOG_TRACE, 20, L"-> But downstream doesn't want DTS-HD, sticking to DTS core"));
m_bDTSHD = FALSE;
m_bForceDTSCore = TRUE;
} else {
av_opt_set_int(m_avBSContext->priv_data, "dtshd_rate", LAV_BITSTREAM_DTS_HD_RATE, 0);
}
}
HRESULT CLAVAudio::Bitstream(const BYTE *pDataBuffer, int buffsize, int &consumed, HRESULT *hrDeliver)
{
HRESULT hr = S_OK;
int ret = 0;
BOOL bFlush = (pDataBuffer == nullptr);
AVPacket avpkt;
av_init_packet(&avpkt);
avpkt.duration = 1;
consumed = 0;
while (buffsize > 0) {
if (bFlush) buffsize = 0;
BYTE *pOut = nullptr;
int pOut_size = 0;
int used_bytes = av_parser_parse2(m_pParser, m_pAVCtx, &pOut, &pOut_size, pDataBuffer, buffsize, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
if (used_bytes < 0) {
DbgLog((LOG_TRACE, 50, L"::Bitstream() - audio parsing failed (ret: %d)", -used_bytes));
return E_FAIL;
} else if(used_bytes == 0 && pOut_size == 0) {
DbgLog((LOG_TRACE, 50, L"::Bitstream() - could not process buffer, starving?"));
break;
}
// Timestamp cache to compensate for one frame delay the parser might introduce, in case the frames were already perfectly sliced apart
// If we used more (or equal) bytes then was output again, we encountered a new frame, update timestamps
if (used_bytes >= pOut_size && m_bUpdateTimeCache) {
m_rtStartInputCache = m_rtStartInput;
m_rtStopInputCache = m_rtStopInput;
m_bUpdateTimeCache = FALSE;
}
if (!bFlush && used_bytes > 0) {
buffsize -= used_bytes;
pDataBuffer += used_bytes;
consumed += used_bytes;
}
if (pOut_size > 0) {
hr = m_bsParser.Parse(m_nCodecId, pOut, pOut_size, m_pParser->priv_data);
if (FAILED(hr)) {
continue;
}
if (m_nCodecId == AV_CODEC_ID_DTS && !m_bDTSHD && !m_bForceDTSCore && m_bsParser.m_bDTSHD && m_settings.bBitstream[Bitstream_DTSHD]) {
ActivateDTSHDMuxing();
}
avpkt.data = pOut;
avpkt.size = pOut_size;
// Write SPDIF muxed frame
ret = av_write_frame(m_avBSContext, &avpkt);
if(ret < 0) {
DbgLog((LOG_ERROR, 20, "::Bitstream(): av_write_frame returned error code (%d)", -ret));
m_bsOutput.SetSize(0);
continue;
}
m_bUpdateTimeCache = TRUE;
// Set long-time cache to the first timestamp encountered, used by TrueHD and E-AC3 because the S/PDIF muxer caches data internally
// If the current timestamp is not valid, use the last delivery timestamp in m_rtStart
if (m_rtBitstreamCache == AV_NOPTS_VALUE)
m_rtBitstreamCache = m_rtStartInputCache != AV_NOPTS_VALUE ? m_rtStartInputCache : m_rtStart;
// Deliver frame
if (m_bsOutput.GetCount() > 0) {
*hrDeliver = DeliverBitstream(m_nCodecId, m_bsOutput.Ptr(), m_bsOutput.GetCount(), pOut_size, m_rtStartInputCache, m_rtStopInputCache);
m_bsOutput.SetSize(0);
}
}
}
return S_OK;
}
HRESULT CLAVAudio::DeliverBitstream(AVCodecID codec, const BYTE *buffer, DWORD dwSize, DWORD dwFrameSize, REFERENCE_TIME rtStartInput, REFERENCE_TIME rtStopInput)
{
HRESULT hr = S_OK;
CMediaType mt = CreateBitstreamMediaType(codec, m_bsParser.m_dwSampleRate);
if(FAILED(hr = ReconnectOutput(dwSize, mt))) {
return hr;
}
IMediaSample *pOut;
BYTE *pDataOut = nullptr;
if(FAILED(GetDeliveryBuffer(&pOut, &pDataOut))) {
return E_FAIL;
}
if (m_bResyncTimestamp && rtStartInput != AV_NOPTS_VALUE) {
m_rtStart = rtStartInput;
m_bResyncTimestamp = FALSE;
}
REFERENCE_TIME rtStart = m_rtStart, rtStop = AV_NOPTS_VALUE;
// TrueHD timings
// Since the SPDIF muxer takes 24 frames and puts them into one IEC61937 frame, we use the cached timestamp from before.
if (codec == AV_CODEC_ID_TRUEHD) {
// long-term cache is valid
if (m_rtBitstreamCache != AV_NOPTS_VALUE)
rtStart = m_rtBitstreamCache;
// Duration - stop time of the current frame is valid
if (rtStopInput != AV_NOPTS_VALUE)
rtStop = rtStopInput;
else // no actual time of the current frame, use typical TrueHD frame size, 24 * 0.83333ms
rtStop = rtStart + (REFERENCE_TIME)(200000 / m_dRate);
m_rtStart = rtStop;
} else {
double dDuration = DBL_SECOND_MULT * (double)m_bsParser.m_dwSamples / m_bsParser.m_dwSampleRate / m_dRate;
m_dStartOffset += fmod(dDuration, 1.0);
// Add rounded duration to rtStop
rtStop = rtStart + (REFERENCE_TIME)(dDuration + 0.5);
// and unrounded to m_rtStart..
m_rtStart += (REFERENCE_TIME)dDuration;
// and accumulate error..
if (m_dStartOffset > 0.5) {
m_rtStart++;
m_dStartOffset -= 1.0;
}
}
REFERENCE_TIME rtJitter = rtStart - m_rtBitstreamCache;
m_faJitter.Sample(rtJitter);
REFERENCE_TIME rtJitterMin = m_faJitter.AbsMinimum();
if (m_settings.AutoAVSync && abs(rtJitterMin) > m_JitterLimit && m_bHasVideo) {
DbgLog((LOG_TRACE, 10, L"::Deliver(): corrected A/V sync by %I64d", rtJitterMin));
m_rtStart -= rtJitterMin;
m_faJitter.OffsetValues(-rtJitterMin);
m_bDiscontinuity = TRUE;
}
#ifdef DEBUG
DbgLog((LOG_CUSTOM5, 20, L"Bitstream Delivery, rtStart(calc): %I64d, rtStart(input): %I64d, duration: %I64d, diff: %I64d", rtStart, m_rtBitstreamCache, rtStop-rtStart, rtJitter));
if (m_faJitter.CurrentSample() == 0) {
DbgLog((LOG_TRACE, 20, L"Jitter Stats: min: %I64d - max: %I64d - avg: %I64d", rtJitterMin, m_faJitter.AbsMaximum(), m_faJitter.Average()));
}
#endif
m_rtBitstreamCache = AV_NOPTS_VALUE;
if(m_settings.AudioDelayEnabled) {
REFERENCE_TIME rtDelay = (REFERENCE_TIME)((m_settings.AudioDelay * 10000i64) / m_dRate);
rtStart += rtDelay;
rtStop += rtDelay;
}
pOut->SetTime(&rtStart, &rtStop);
pOut->SetMediaTime(nullptr, nullptr);
pOut->SetPreroll(FALSE);
pOut->SetDiscontinuity(m_bDiscontinuity);
m_bDiscontinuity = FALSE;
pOut->SetSyncPoint(TRUE);
pOut->SetActualDataLength(dwSize);
memcpy(pDataOut, buffer, dwSize);
if(hr == S_OK) {
hr = m_pOutput->GetConnected()->QueryAccept(&mt);
if (hr == S_FALSE && m_nCodecId == AV_CODEC_ID_DTS && m_bDTSHD) {
DbgLog((LOG_TRACE, 1, L"DTS-HD Media Type failed with %0#.8x, trying fallback to DTS core", hr));
m_bForceDTSCore = TRUE;
UpdateBitstreamContext();
goto done;
}
DbgLog((LOG_TRACE, 1, L"Sending new Media Type (QueryAccept: %0#.8x)", hr));
m_pOutput->SetMediaType(&mt);
pOut->SetMediaType(&mt);
}
hr = m_pOutput->Deliver(pOut);
if (FAILED(hr)) {
DbgLog((LOG_ERROR, 10, L"::DeliverBitstream failed with code: %0#.8x", hr));
}
done:
SafeRelease(&pOut);
return hr;
}
|