2 Copyright 2005-2007 Mark Calderbank
3 Copyright 2007 Marten Richter (AC3 support)
5 This file is part of VOMP.
7 VOMP is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 VOMP is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with VOMP; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #define DEMUXER_SEQ_HEAD 0x000001B3
28 #define DEMUXER_PIC_HEAD 0x00000101
29 #define SEEK_THRESHOLD 150000 // About 1.5 seconds
32 const int Demuxer::FrameRates[9] = { 0, 23, 24, 25, 29, 30, 50, 59, 60 };
33 const ULLONG PESPacket::PTS_INVALID = (1LL << 33);
34 Demuxer* Demuxer::instance = NULL;
37 PESPacket::PESPacket()
45 void PESPacket::init(UCHAR type)
49 data[4] = data[5] = 0;
51 seq_header = 1; // Unknown seq_header status
54 void PESPacket::truncate()
59 int PESPacket::write(UCHAR *buf, int len)
61 if (length + len > 0xFFFA) return 0;
62 memcpy(data+length+6, buf, len);
65 data[4] = (length >> 8);
66 data[5] = (length & 0xFF);
67 // We have added data - reset seq_header indicator if necessary
68 if (seq_header == 0) seq_header = 1; // Reset to 'unknown'
72 ULLONG PESPacket::getPTS()
74 if ( ( (packetType >= Demuxer::PESTYPE_AUD0 &&
75 packetType <= Demuxer::PESTYPE_AUDMAX)
77 (packetType >= Demuxer::PESTYPE_VID0 &&
78 packetType <= Demuxer::PESTYPE_VIDMAX)
79 ) && size >= 14 && data[7] & 0x80)
81 return ( (ULLONG)(data[ 9] & 0x0E) << 29) |
82 ( (ULLONG)(data[10]) << 22 ) |
83 ( (ULLONG)(data[11] & 0xFE) << 14 ) |
84 ( (ULLONG)(data[12]) << 7 ) |
85 ( (ULLONG)(data[13] & 0xFE) >> 1 );
87 else return PTS_INVALID;
90 UCHAR PESPacket::operator[] (UINT index)
98 UINT PESPacket::findPictureHeader()
100 if (size < 12) return 0;
101 UINT pattern = ( ((UINT)data[ 8] << 24) |
102 ((UINT)data[ 9] << 16) |
103 ((UINT)data[10] << 8) |
106 while (pattern != DEMUXER_PIC_HEAD)
108 if (++pos >= size) return 0;
109 pattern = (pattern << 8) | data[pos];
114 UINT PESPacket::findSeqHeader()
116 if (seq_header != 1) return seq_header;
117 if (size < 12) return 0;
118 UINT pattern = ( ((UINT)data[ 8] << 24) |
119 ((UINT)data[ 9] << 16) |
120 ((UINT)data[10] << 8) |
123 while (pattern != DEMUXER_SEQ_HEAD)
130 pattern = (pattern << 8) | data[pos];
132 seq_header = pos - 3;
139 if (instance) return;
144 vid_seeking = aud_seeking = false;
145 video_pts = audio_pts = 0;
146 ispre_1_3_19 = false;
155 Demuxer* Demuxer::getInstance()
160 int Demuxer::init(Callback* tcallback, DrainTarget* audio, DrainTarget* video, ULONG demuxMemoryV, ULONG demuxMemoryA)
164 if ( !videostream.init(video, demuxMemoryV) ||
165 !audiostream.init(audio, demuxMemoryA))
167 Log::getInstance()->log("Demuxer", Log::CRIT,
168 "Failed to initialize demuxer");
176 callback = tcallback;
180 void Demuxer::reset()
183 video_current = audio_current = -1;
184 horizontal_size = vertical_size = 0;
185 aspect_ratio = (enum AspectRatio) 0;
186 frame_rate = bit_rate = 0;
187 ispre_1_3_19 = false;
189 for (int i = 0; i <= (PESTYPE_AUDMAX - PESTYPE_AUD0); i++)
191 avail_mpaudchan[i] = false;
193 for (int i = 0; i <= (PESTYPE_SUBSTREAM_AC3MAX - PESTYPE_SUBSTREAM_AC30); i++)
195 avail_ac3audchan[i] = false;
199 int Demuxer::shutdown()
201 videostream.shutdown();
202 audiostream.shutdown();
207 void Demuxer::flush()
213 void Demuxer::flushAudio()
220 vid_seeking = aud_seeking = true;
221 video_pts = audio_pts = 0;
224 void Demuxer::setAudioStream(int id)
229 void Demuxer::setVideoStream(int id)
234 void Demuxer::setAspectRatio(enum AspectRatio ar)
236 if (aspect_ratio != ar)
238 Log::getInstance()->log("Demux", Log::DEBUG,
239 "Aspect ratio difference signalled");
240 if (++arcnt > 3) // avoid changing aspect ratio if glitch in signal
244 if (callback) callback->call(this);
251 bool Demuxer::writeAudio()
253 return audiostream.drain();
256 bool Demuxer::writeVideo()
258 return videostream.drain();
261 bool Demuxer::submitPacket(PESPacket& packet)
264 UCHAR packet_type = packet.getPacketType();
266 if (packet_type >= PESTYPE_VID0 && packet_type <= PESTYPE_VIDMAX)
268 if (video_current == -1) video_current = packet_type;
269 if (video_current == packet_type && !vid_seeking)
270 sent = videostream.put(packet.getData(), packet.getSize(), MPTYPE_VIDEO);
272 sent = packet.getSize();
274 else if (packet_type >= PESTYPE_AUD0 && packet_type <= PESTYPE_AUDMAX)
276 if (audio_current == -1) audio_current = packet_type;
277 avail_mpaudchan[packet_type - PESTYPE_AUD0] = true;
278 if (audio_current == packet_type && !aud_seeking)
279 sent = audiostream.put(packet.getData(), packet.getSize(), MPTYPE_MPEG_AUDIO);
281 sent = packet.getSize();
283 else if (packet_type == PESTYPE_PRIVATE_1)
285 if (packet.getSubstream() >= PESTYPE_SUBSTREAM_AC30 &&
286 packet.getSubstream() <= PESTYPE_SUBSTREAM_AC3MAX)
288 avail_ac3audchan[packet.getSubstream() - PESTYPE_SUBSTREAM_AC30] = true;
289 if (packet.getSubstream() == audio_current)
291 sent = audiostream.put(packet.getData(), packet.getSize(), (ispre_1_3_19)? MPTYPE_AC3_PRE13 : MPTYPE_AC3);
295 sent = packet.getSize();
301 sent = packet.getSize();
304 if (sent < packet.getSize()) // Stream is full.
310 void Demuxer::parsePacketDetails(PESPacket& packet)
312 if (packet.getPacketType() >= PESTYPE_AUD0 &&
313 packet.getPacketType() <= PESTYPE_AUDMAX)
315 // Extract audio PTS if it exists
318 audio_pts = packet.getPTS();
319 // We continue to seek on the audio if the video PTS that we
320 // are trying to match is ahead of the audio PTS by at most
321 // SEEK_THRESHOLD. We consider the possibility of PTS wrap.
322 if (aud_seeking && !vid_seeking &&
323 !( (video_pts_seek > audio_pts &&
324 video_pts_seek - audio_pts < SEEK_THRESHOLD)
326 (video_pts_seek < audio_pts &&
327 video_pts_seek + (1LL<<33) - audio_pts < SEEK_THRESHOLD) ))
330 Log::getInstance()->log("Demuxer", Log::DEBUG,
331 "Leaving audio sync: Audio PTS = %llu", audio_pts);
335 else if (packet.getPacketType() == PESTYPE_PRIVATE_1) // Private stream
337 //Inspired by vdr's device.c
338 int payload_begin = packet[8]+9;
339 unsigned char substream_id = packet[payload_begin];
340 unsigned char substream_type = substream_id & 0xF0;
341 unsigned char substream_index = substream_id & 0x1F;
342 pre_1_3_19_Recording: //This is for old recordings stuff
345 substream_id = PESTYPE_PRIVATE_1;
346 substream_type = 0x80;
349 switch (substream_type)
354 case 0xA0: //LPCM //not supported yet, is there any LPCM transmissio out there?
356 case 0x80: //ac3, currently only one ac3 track per recording supported
357 packet.setSubstream(substream_type+substream_index);
359 // Extract audio PTS if it exists
362 audio_pts = packet.getPTS();
363 // We continue to seek on the audio if the video PTS that we
364 // are trying to match is ahead of the audio PTS by at most
365 // SEEK_THRESHOLD. We consider the possibility of PTS wrap.
366 if (aud_seeking && !vid_seeking &&
367 !( (video_pts_seek > audio_pts &&
368 video_pts_seek - audio_pts < SEEK_THRESHOLD)
370 (video_pts_seek < audio_pts &&
371 video_pts_seek + (1LL<<33) - audio_pts < SEEK_THRESHOLD) ))
374 Log::getInstance()->log("Demuxer", Log::DEBUG, "Leaving audio sync: Audio PTS = %llu", audio_pts);
381 ispre_1_3_19=true; //switching to compat mode
382 goto pre_1_3_19_Recording;
386 packet.setSubstream(0);
391 else if (packet.getPacketType() >= PESTYPE_VID0 &&
392 packet.getPacketType() <= PESTYPE_VIDMAX)
394 // Extract video PTS if it exists
395 if (packet.hasPTS()) video_pts = packet.getPTS();
397 // If there is a sequence header, extract information
398 UINT pos = packet.findSeqHeader();
402 if (pos+6 >= packet.getSize()) return;
403 horizontal_size = ((int)packet[pos] << 4) | ((int)packet[pos+1] >> 4);
404 vertical_size = (((int)packet[pos+1] & 0xf) << 8) | (int)packet[pos+2];
405 setAspectRatio((enum AspectRatio)(packet[pos+3] >> 4));
406 frame_rate = packet[pos+3] & 0x0f;
407 if (frame_rate >= 1 && frame_rate <= 8)
408 frame_rate = FrameRates[frame_rate];
411 bit_rate = ((int)packet[pos+4] << 10) |
412 ((int)packet[pos+5] << 2) |
413 ((int)packet[pos+6] >> 6);
417 video_pts_seek = video_pts;
418 Log::getInstance()->log("Demuxer", Log::DEBUG,
419 "Entering audio sync: Video PTS = %llu", video_pts);
420 Log::getInstance()->log("Demuxer", Log::DEBUG,
421 "Entering audio sync: Audio PTS = %llu", audio_pts);
428 UINT Demuxer::stripAudio(UCHAR* buf, UINT len)
430 UINT read_pos = 0, write_pos = 0;
431 UINT pattern, packet_length;
432 if (len < 4) return 0;
433 pattern = (buf[0] << 16) | (buf[1] << 8) | (buf[2]);
434 while (read_pos + 7 <= len)
436 pattern = ((pattern & 0xFFFFFF) << 8) | buf[read_pos+3];
437 if (pattern < (0x100|PESTYPE_VID0) || pattern > (0x100|PESTYPE_VIDMAX))
441 packet_length = ((buf[read_pos+4] << 8) | (buf[read_pos+5])) + 6;
442 if (read_pos + packet_length > len)
446 if (read_pos != write_pos)
447 memmove(buf+write_pos, buf+read_pos, packet_length);
448 read_pos += packet_length;
449 write_pos += packet_length;
450 pattern = (buf[read_pos] << 16) | (buf[read_pos+1] << 8)
458 bool Demuxer::scanForVideo(UCHAR* buf, UINT len)
462 if (len < 4) return false;
463 pattern = (buf[0] << 16) | (buf[1] << 8) | (buf[2]);
466 pattern = ((pattern & 0xFFFFFF) << 8) | buf[pos++];
467 if (pattern >= (0x100|PESTYPE_VID0) && pattern <= (0x100|PESTYPE_VIDMAX))
473 bool* Demuxer::getmpAudioChannels()
475 return avail_mpaudchan;
478 bool* Demuxer::getac3AudioChannels()
480 return avail_ac3audchan;
483 int Demuxer::getselAudioChannel()
485 return audio_current;
488 void Demuxer::setAudioChannel(int aud_channel)
490 audio_current = aud_channel;