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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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;
52 seq_header = 1; // Unknown seq_header status
55 void PESPacket::truncate()
60 int PESPacket::write(UCHAR *buf, int len)
62 if (length + len > 0xFFFA) return 0;
63 memcpy(data+length+6, buf, len);
66 data[4] = (length >> 8);
67 data[5] = (length & 0xFF);
68 // We have added data - reset seq_header indicator if necessary
69 if (seq_header == 0) seq_header = 1; // Reset to 'unknown'
73 ULLONG PESPacket::getPTS()
75 if ( ( (packetType >= Demuxer::PESTYPE_AUD0 &&
76 packetType <= Demuxer::PESTYPE_AUDMAX)
78 (packetType >= Demuxer::PESTYPE_VID0 &&
79 packetType <= Demuxer::PESTYPE_VIDMAX)
80 ) && size >= 14 && data[7] & 0x80)
82 return ( (ULLONG)(data[ 9] & 0x0E) << 29) |
83 ( (ULLONG)(data[10]) << 22 ) |
84 ( (ULLONG)(data[11] & 0xFE) << 14 ) |
85 ( (ULLONG)(data[12]) << 7 ) |
86 ( (ULLONG)(data[13] & 0xFE) >> 1 );
88 else return PTS_INVALID;
91 UCHAR PESPacket::operator[] (UINT index)
99 UINT PESPacket::findPictureHeader()
101 if (size < 12) return 0;
102 UINT pattern = ( ((UINT)data[ 8] << 24) |
103 ((UINT)data[ 9] << 16) |
104 ((UINT)data[10] << 8) |
107 while (pattern != DEMUXER_PIC_HEAD)
109 if (++pos >= size) return 0;
110 pattern = (pattern << 8) | data[pos];
115 UINT PESPacket::findSeqHeader()
117 if (seq_header != 1) return seq_header;
118 if (size < 12) return 0;
119 UINT pattern = ( ((UINT)data[ 8] << 24) |
120 ((UINT)data[ 9] << 16) |
121 ((UINT)data[10] << 8) |
124 while (pattern != DEMUXER_SEQ_HEAD)
131 pattern = (pattern << 8) | data[pos];
133 seq_header = pos - 3;
140 if (instance) return;
145 vid_seeking = aud_seeking = false;
146 video_pts = audio_pts = 0;
147 ispre_1_3_19 = false;
156 Demuxer* Demuxer::getInstance()
161 int Demuxer::init(Callback* tcallback, DrainTarget* audio, DrainTarget* video, ULONG demuxMemoryV, ULONG demuxMemoryA)
165 if ( !videostream.init(video, demuxMemoryV) ||
166 !audiostream.init(audio, demuxMemoryA))
168 Log::getInstance()->log("Demuxer", Log::CRIT,
169 "Failed to initialize demuxer");
177 callback = tcallback;
181 void Demuxer::reset()
183 Log::getInstance()->log("Demuxer", Log::DEBUG, "Reset called");
185 video_current = audio_current = -1;
186 horizontal_size = vertical_size = 0;
187 aspect_ratio = (enum AspectRatio) 0;
188 frame_rate = bit_rate = 0;
189 ispre_1_3_19 = false;
191 for (int i = 0; i <= (PESTYPE_AUDMAX - PESTYPE_AUD0); i++)
193 avail_mpaudchan[i] = false;
195 for (int i = 0; i <= (PESTYPE_SUBSTREAM_AC3MAX - PESTYPE_SUBSTREAM_AC30); i++)
197 avail_ac3audchan[i] = false;
201 int Demuxer::shutdown()
203 videostream.shutdown();
204 audiostream.shutdown();
209 void Demuxer::flush()
211 Log::getInstance()->log("Demuxer", Log::DEBUG, "Flush called");
217 void Demuxer::flushAudio()
224 vid_seeking = aud_seeking = true;
225 video_pts = audio_pts = 0;
228 void Demuxer::setAudioStream(int id)
233 void Demuxer::setVideoStream(int id)
238 void Demuxer::setAspectRatio(enum AspectRatio ar)
240 if (aspect_ratio != ar)
242 Log::getInstance()->log("Demux", Log::DEBUG,
243 "Aspect ratio difference signalled");
244 if (++arcnt > 3) // avoid changing aspect ratio if glitch in signal
248 if (callback) callback->call(this);
255 bool Demuxer::writeAudio()
257 return audiostream.drain();
260 bool Demuxer::writeVideo()
262 return videostream.drain();
265 bool Demuxer::submitPacket(PESPacket& packet)
268 UCHAR packet_type = packet.getPacketType();
270 if (packet_type >= PESTYPE_VID0 && packet_type <= PESTYPE_VIDMAX)
272 if (video_current == -1) video_current = packet_type;
273 if (video_current == packet_type && !vid_seeking)
274 sent = videostream.put(packet.getData(), packet.getSize(), MPTYPE_VIDEO);
276 sent = packet.getSize();
278 else if (packet_type >= PESTYPE_AUD0 && packet_type <= PESTYPE_AUDMAX)
280 if (audio_current == -1) audio_current = packet_type;
281 avail_mpaudchan[packet_type - PESTYPE_AUD0] = true;
282 if (audio_current == packet_type && !aud_seeking)
283 sent = audiostream.put(packet.getData(), packet.getSize(), MPTYPE_MPEG_AUDIO);
285 sent = packet.getSize();
287 else if (packet_type == PESTYPE_PRIVATE_1 &&
288 packet.getSubstream() >= PESTYPE_SUBSTREAM_AC30 &&
289 packet.getSubstream() <= PESTYPE_SUBSTREAM_AC3MAX)
291 avail_ac3audchan[packet.getSubstream() - PESTYPE_SUBSTREAM_AC30] = true;
292 if (packet.getSubstream() == audio_current)
294 sent = audiostream.put(packet.getData(), packet.getSize(), (ispre_1_3_19)? MPTYPE_AC3_PRE13 : MPTYPE_AC3);
298 sent = packet.getSize();
303 sent = packet.getSize();
306 if (sent < packet.getSize()) // Stream is full.
312 void Demuxer::parsePacketDetails(PESPacket& packet)
314 if (packet.getPacketType() >= PESTYPE_AUD0 &&
315 packet.getPacketType() <= PESTYPE_AUDMAX)
317 // Extract audio PTS if it exists
320 audio_pts = packet.getPTS();
321 // We continue to seek on the audio if the video PTS that we
322 // are trying to match is ahead of the audio PTS by at most
323 // SEEK_THRESHOLD. We consider the possibility of PTS wrap.
324 if (aud_seeking && !vid_seeking &&
325 !( (video_pts_seek > audio_pts &&
326 video_pts_seek - audio_pts < SEEK_THRESHOLD)
328 (video_pts_seek < audio_pts &&
329 video_pts_seek + (1LL<<33) - audio_pts < SEEK_THRESHOLD) ))
332 Log::getInstance()->log("Demuxer", Log::DEBUG,
333 "Leaving audio sync: Audio PTS = %llu", audio_pts);
337 else if (packet.getPacketType() == PESTYPE_PRIVATE_1) // Private stream
339 //Inspired by vdr's device.c
340 int payload_begin = packet[8]+9;
341 unsigned char substream_id = packet[payload_begin];
342 unsigned char substream_type = substream_id & 0xF0;
343 unsigned char substream_index = substream_id & 0x1F;
344 pre_1_3_19_Recording: //This is for old recordings stuff
347 substream_id = PESTYPE_PRIVATE_1;
348 substream_type = 0x80;
351 switch (substream_type)
356 case 0xA0: //LPCM //not supported yet, is there any LPCM transmissio out there?
358 case 0x80: //ac3, currently only one ac3 track per recording supported
359 packet.setSubstream(substream_type+substream_index);
361 // Extract audio PTS if it exists
364 audio_pts = packet.getPTS();
365 // We continue to seek on the audio if the video PTS that we
366 // are trying to match is ahead of the audio PTS by at most
367 // SEEK_THRESHOLD. We consider the possibility of PTS wrap.
368 if (aud_seeking && !vid_seeking &&
369 !( (video_pts_seek > audio_pts &&
370 video_pts_seek - audio_pts < SEEK_THRESHOLD)
372 (video_pts_seek < audio_pts &&
373 video_pts_seek + (1LL<<33) - audio_pts < SEEK_THRESHOLD) ))
376 Log::getInstance()->log("Demuxer", Log::DEBUG, "Leaving audio sync: Audio PTS = %llu", audio_pts);
383 ispre_1_3_19=true; //switching to compat mode
384 goto pre_1_3_19_Recording;
388 packet.setSubstream(0);
393 else if (packet.getPacketType() >= PESTYPE_VID0 &&
394 packet.getPacketType() <= PESTYPE_VIDMAX)
396 // Extract video PTS if it exists
397 if (packet.hasPTS()) video_pts = packet.getPTS();
399 // If there is a sequence header, extract information
400 UINT pos = packet.findSeqHeader();
404 if (pos+6 >= packet.getSize()) return;
405 horizontal_size = ((int)packet[pos] << 4) | ((int)packet[pos+1] >> 4);
406 vertical_size = (((int)packet[pos+1] & 0xf) << 8) | (int)packet[pos+2];
407 setAspectRatio((enum AspectRatio)(packet[pos+3] >> 4));
408 frame_rate = packet[pos+3] & 0x0f;
409 if (frame_rate >= 1 && frame_rate <= 8)
410 frame_rate = FrameRates[frame_rate];
413 bit_rate = ((int)packet[pos+4] << 10) |
414 ((int)packet[pos+5] << 2) |
415 ((int)packet[pos+6] >> 6);
419 video_pts_seek = video_pts;
420 Log::getInstance()->log("Demuxer", Log::DEBUG,
421 "Entering audio sync: Video PTS = %llu", video_pts);
422 Log::getInstance()->log("Demuxer", Log::DEBUG,
423 "Entering audio sync: Audio PTS = %llu", audio_pts);
430 UINT Demuxer::stripAudio(UCHAR* buf, UINT len)
432 UINT read_pos = 0, write_pos = 0;
433 UINT pattern, packet_length;
434 if (len < 4) return 0;
435 pattern = (buf[0] << 16) | (buf[1] << 8) | (buf[2]);
436 while (read_pos + 7 <= len)
438 pattern = ((pattern & 0xFFFFFF) << 8) | buf[read_pos+3];
439 if (pattern < (0x100|PESTYPE_VID0) || pattern > (0x100|PESTYPE_VIDMAX))
443 packet_length = ((buf[read_pos+4] << 8) | (buf[read_pos+5])) + 6;
444 if (read_pos + packet_length > len)
448 if (read_pos != write_pos)
449 memmove(buf+write_pos, buf+read_pos, packet_length);
450 read_pos += packet_length;
451 write_pos += packet_length;
452 pattern = (buf[read_pos] << 16) | (buf[read_pos+1] << 8)
460 bool Demuxer::scanForVideo(UCHAR* buf, UINT len)
464 if (len < 4) return false;
465 pattern = (buf[0] << 16) | (buf[1] << 8) | (buf[2]);
468 pattern = ((pattern & 0xFFFFFF) << 8) | buf[pos++];
469 if (pattern >= (0x100|PESTYPE_VID0) && pattern <= (0x100|PESTYPE_VIDMAX))
475 bool* Demuxer::getmpAudioChannels()
477 return avail_mpaudchan;
480 bool* Demuxer::getac3AudioChannels()
482 return avail_ac3audchan;
485 int Demuxer::getselAudioChannel()
487 return audio_current;
490 void Demuxer::setAudioChannel(int aud_channel)
492 audio_current = aud_channel;