2 Copyright 2005-2006 Mark Calderbank
4 This file is part of VOMP.
6 VOMP is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 VOMP is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with VOMP; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 const int Demuxer::FrameRates[9] = { 0, 23, 24, 25, 29, 30, 50, 59, 60 };
26 Demuxer* Demuxer::instance = NULL;
43 Demuxer* Demuxer::getInstance()
48 int Demuxer::init(Callback* tcallback)
52 if ( !videostream.init(demuxMemoryV) ||
53 !audiostream.init(demuxMemoryA) ||
54 !(local_frame = (UCHAR *) malloc(0x10000)))
56 Log::getInstance()->log("Demuxer", Log::CRIT, "Failed to initialize demuxer");
61 videostream.setDrainTarget(Video::getInstance());
62 audiostream.setDrainTarget(Audio::getInstance());
75 video_current = audio_current = -1;
76 horizontal_size = vertical_size = 0;
77 aspect_ratio = (enum AspectRatio) 0;
78 frame_rate = bit_rate = 0;
81 int Demuxer::shutdown()
83 videostream.shutdown();
84 audiostream.shutdown();
94 state_frametype = state_framepos = 0;
98 void Demuxer::flushAudio()
105 vid_seeking = aud_seeking = 1;
106 video_pts = audio_pts = 0;
109 void Demuxer::setAudioStream(int id)
114 void Demuxer::setVideoStream(int id)
119 void Demuxer::setAspectRatio(enum AspectRatio ar)
121 if (aspect_ratio != ar)
123 Log::getInstance()->log("Demux", Log::DEBUG, "Aspect ratio difference signalled");
124 if (++arcnt > 3) // avoid changing aspect ratio if glitch in signal
128 callback->call(this);
135 int Demuxer::writeAudio(int fd)
137 return audiostream.drain(fd);
140 int Demuxer::writeVideo(int fd)
142 return videostream.drain(fd);
145 int Demuxer::writeAudio(DrainTarget* dt)
147 return audiostream.drain(dt);
150 int Demuxer::writeVideo(DrainTarget* dt)
152 return videostream.drain(dt);
157 int Demuxer::scan(UCHAR *buf, int len)
159 // Temporarily, just look for the lowest audio stream and return it
165 // We are searching for a string of bytes (0,0,1).
166 byte = *(buf++); --len;
172 if (zeros < 2 || byte != 1)
177 // We have found the pattern (0,0,1).
178 // Check the next byte for the sub-frame type.
179 byte = *(buf++); --len;
180 if (byte >= 0xc0 && byte <= 0xdf) // Audio
181 if (ret == 0 || ret > byte) ret = byte;
186 int Demuxer::put(UCHAR* buf, int len)
188 int ret = 0; // return number of bytes consumed
189 int parsed = 0; // number of bytes parsed by sub-function
190 int full; // sub-function sets this to tell us to exit early
191 inbuf = buf; // Initialize buffer pointer
197 if (state_frametype == 0) // Search for frame
199 parsed = parse_find_frame(len);
201 else if ((state_frametype >= FRAMETYPE_VID0) && (state_frametype <= FRAMETYPE_VIDMAX))
203 parsed = parse_video_frame(len, &full);
205 else if ((state_frametype >= FRAMETYPE_AUD0) && (state_frametype <= FRAMETYPE_AUDMAX))
207 parsed = parse_audio_frame(len, &full);
209 else if (state_frametype == FRAMETYPE_PRIVATE_1)
211 parsed = parse_private1_frame(len, &full);
214 ret += parsed; len -= parsed;
215 if (full) // We have to exit early.
216 break; // out of while loop
218 //Log::getInstance()->log("Demuxer", Log::DEBUG, "Put %d; took %d", ret + len, ret);
222 int Demuxer::parse_find_frame(int len)
224 int ret = 0; // return number of bytes parsed
227 // In this function, state_framepos represents
228 // the number of fixed header bytes found so far.
229 if (state_framepos > 3 || state_framepos < 0)
239 switch (state_framepos)
255 state_framepos = 0; // Set initial state for the new frame
259 state_framepos = 1; // Count this as a first header byte!
261 else if ( ((byte >= FRAMETYPE_VID0) && (byte <= FRAMETYPE_VIDMAX))
262 || ((byte >= FRAMETYPE_AUD0) && (byte <= FRAMETYPE_AUDMAX))
263 || byte==FRAMETYPE_PRIVATE_1 )
265 state_frametype = byte;
269 // Not a recognised frame type. Go back to Old Kent Road.
276 int Demuxer::parse_video_frame(int len, int* full)
278 int ret = 0; // return number of bytes consumed
281 switch(state_framepos)
283 case 0: // Brand new video frame. Set initial states.
284 state_stream_fill = 0; state_vid_parsed = 0;
285 // Create a local copy of the frame header
286 local_frame[0] = local_frame[1] = 0; local_frame[2] = 1;
287 local_frame[3] = state_frametype;
288 // If no video stream has been set, use this one.
289 if (video_current == -1) video_current = state_frametype;
290 // Get MSB of frame length and copy to local frame.
291 frame_length = *inbuf << 8;
292 local_frame[4] = *inbuf;
293 ++inbuf; ++state_framepos; ++ret; --len;
294 if (len == 0) return ret;
295 // FALL THROUGH TO NEXT BYTE IN STREAM
296 case 1: // Get LSB of frame length and copy to local frame.
297 frame_length += *inbuf;
298 local_frame[5] = *inbuf;
299 ++inbuf; ++state_framepos; ++ret; --len;
300 if (len == 0) return ret;
302 // We are in the frame data
303 bytes_remaining = 2 + frame_length - state_framepos;
304 if (video_current != state_frametype)
306 // We don't want this frame. Throw it away.
307 if (len >= bytes_remaining)
309 inbuf += bytes_remaining;
310 ret += bytes_remaining;
311 state_frametype = state_framepos = 0;
316 inbuf += len; ret += len;
317 state_framepos += len;
320 } // No fall through here
322 if (bytes_remaining) // There is data yet to copy to local_frame
324 if (len > bytes_remaining) len = bytes_remaining;
325 memcpy(local_frame + state_framepos + 4, inbuf, len);
326 inbuf += len; ret += len; state_framepos += len;
327 if (len < bytes_remaining) // Not all arrived yet
329 parse_video_details(local_frame+6, frame_length);
334 // We have the whole frame in local_frame. Send it to the stream.
335 // We still support streams that might not consume all the data.
336 state_stream_fill += videostream.put(local_frame,
337 6 + frame_length - state_stream_fill);
338 if (state_stream_fill < frame_length + 6) // stream is full!
340 *full = 1; return ret;
343 state_frametype = state_framepos = 0;
347 int Demuxer::parse_audio_frame(int len, int* full)
349 int ret = 0; // return number of bytes consumed
352 switch(state_framepos)
354 case 0: // Brand new audio frame. Set initial states.
355 state_stream_fill = 0;
356 // Create a local copy of the frame header
357 local_frame[0] = local_frame[1] = 0; local_frame[2] = 1;
358 local_frame[3] = state_frametype;
359 // If no audio stream has been set, use this one.
360 if (audio_current == -1) audio_current = state_frametype;
361 // Get MSB of frame length and copy to local frame.
362 frame_length = *inbuf << 8;
363 local_frame[4] = *inbuf;
364 ++inbuf; ++state_framepos; ++ret; --len;
365 if (len == 0) return ret;
366 // FALL THROUGH TO NEXT BYTE IN STREAM
367 case 1: // Get LSB of frame length and copy to local frame.
368 frame_length += *inbuf;
369 local_frame[5] = *inbuf;
370 ++inbuf; ++state_framepos; ++ret; --len;
371 if (len == 0) return ret;
373 // We are in the frame data
374 bytes_remaining = 2 + frame_length - state_framepos;
375 if (audio_current != state_frametype)
377 // We don't want this frame. Throw it away.
378 if (len >= bytes_remaining)
380 inbuf += bytes_remaining;
381 ret += bytes_remaining;
382 state_frametype = state_framepos = 0;
387 inbuf += len; ret += len;
388 state_framepos += len;
391 } // No fall through is allowed here
393 if (bytes_remaining) // There is data yet to copy to local_frame
395 if (len > bytes_remaining) len = bytes_remaining;
396 memcpy(local_frame + state_framepos + 4, inbuf, len);
397 inbuf += len; ret += len; state_framepos += len;
398 if (len < bytes_remaining) // Not all arrived yet
400 parse_audio_details(local_frame+6, frame_length);
405 // We have the whole frame in local_frame. Send it to the stream.
406 // We still support streams that might not consume all the data.
407 state_stream_fill += audiostream.put(local_frame,
408 6 + frame_length - state_stream_fill);
409 if (state_stream_fill < frame_length + 6) // stream is full!
411 *full = 1; return ret;
414 state_frametype = state_framepos = 0;
418 int Demuxer::parse_private1_frame(int len, int* full)
420 int ret = 0; // return number of bytes consumed
423 switch(state_framepos)
425 case 0: // Brand new frame. Set initial states.
426 // Get MSB of frame length and copy to local frame.
427 frame_length = *inbuf << 8;
428 ++inbuf; ++state_framepos; ++ret; --len;
429 if (len == 0) return ret;
430 // FALL THROUGH TO NEXT BYTE IN STREAM
431 case 1: // Get LSB of frame length and copy to local frame.
432 frame_length += *inbuf;
433 local_frame[5] = *inbuf;
434 ++inbuf; ++state_framepos; ++ret; --len;
435 if (len == 0) return ret;
437 // We are in the frame data
438 bytes_remaining = 2 + frame_length - state_framepos;
439 // Temporary - just discard the frame.
440 if (len >= bytes_remaining)
442 inbuf += bytes_remaining;
443 ret += bytes_remaining;
444 state_frametype = state_framepos = 0;
449 inbuf += len; ret += len;
450 state_framepos += len;
455 void Demuxer::parse_audio_details(UCHAR* buf, int len)
457 // Extract audio PTS if it exists
458 if ( buf[1] & 0x80 ) // PTS_DTS_flags indicate that PTS is present
460 audio_pts = ( (ULLONG)(buf[3] & 0x0E) << 29 ) |
461 ( (ULLONG)(buf[4]) << 22 ) |
462 ( (ULLONG)(buf[5] & 0xFE) << 14 ) |
463 ( (ULLONG)(buf[6]) << 7 ) |
464 ( (ULLONG)(buf[7] & 0xFE) >> 1 );
465 if (aud_seeking && !vid_seeking && audio_pts >= video_pts_seek)
468 Log::getInstance()->log("Demuxer", Log::DEBUG,
469 "Leaving audio seek: Audio PTS = %llu", audio_pts);
474 void Demuxer::parse_video_details(UCHAR* buf, int len)
476 // Extract video PTS if it exists
477 if ( buf[1] & 0x80 ) // PTS_DTS_flags indicate that PTS is present
479 video_pts = ( (ULLONG)(buf[3] & 0x0E) << 29 ) |
480 ( (ULLONG)(buf[4]) << 22 ) |
481 ( (ULLONG)(buf[5] & 0xFE) << 14 ) |
482 ( (ULLONG)(buf[6]) << 7 ) |
483 ( (ULLONG)(buf[7] & 0xFE) >> 1 );
485 // Now, scan for a GOP header and extract video information
488 while (len >= 8) // 8 is length of a GOP header
490 // We are searching for a string of bytes (0,0,1).
491 byte = *(buf++); --len;
497 if (zeros < 2 || byte != 1)
502 // We have found the pattern (0,0,1).
503 // Check the next byte for the sub-frame type.
504 byte = *(buf++); --len;
507 /* case 0x00: // Picture header
508 // 10 bits: temporal reference
509 // 3 bits: coding type (I/P/B)
512 if ( (buf[1] & 0x38) == 0x08 ) // I-frame
514 buf += 4; // Minimum length of picture header
518 case 0xb3: // Sequence header
519 // 12 bits: Horizontal size
520 // 12 bits: Vertical size
521 // 4 bits: Aspect ratio
522 // 4 bits: Frame rate code
523 // 18 bits: Bit rate value
526 horizontal_size = ((int)buf[0] << 4) | ((int)buf[1] >> 4);
527 vertical_size = (((int)buf[1] & 0xf) << 8) | (int)buf[2];
528 setAspectRatio((enum AspectRatio)(buf[3] >> 4));
529 frame_rate = buf[3] & 0x0f;
530 if (frame_rate >= 1 && frame_rate <= 8)
531 frame_rate = FrameRates[frame_rate];
534 bit_rate = ((int)buf[4] << 10) |
540 video_pts_seek = video_pts;
541 Log::getInstance()->log("Demuxer", Log::DEBUG,
542 "Entering video seek: Video PTS = %llu", video_pts);
543 Log::getInstance()->log("Demuxer", Log::DEBUG,
544 "Entering video seek: Audio PTS = %llu", audio_pts);
546 buf += 8; // Minimum length of sequence header
550 case 0xb8: // Group header
551 // We're not going to bother parsing anything.
553 buf += 4; // Minimum length of group header
561 int Demuxer::findVideoPTS(UCHAR* buf, int len, ULLONG* dest)
565 UINT pattern = *(UINT*)buf;
567 #if __BYTE_ORDER == __BIG_ENDIAN
568 if (pattern < (0x100 | FRAMETYPE_VID0) ||
569 pattern > (0x100 | FRAMETYPE_VIDMAX)) continue;
571 if ((pattern & 0xFFFFFF) != 0x010000 ||
572 pattern < ((UINT)FRAMETYPE_VID0 << 24) ||
573 pattern > ((UINT)FRAMETYPE_VIDMAX << 24)) continue;
575 if ((buf[5] & 0xC0) != 0x80) continue;
577 UINT framelength = ((UINT)buf[3] << 8) | buf[4];
579 if ( buf[6] & 0x80 ) // PTS_DTS_flags indicate that PTS is present
581 if ( (buf[8] & 0x01) != 0x01 ||
582 (buf[10] & 0x01) != 0x01 ||
583 (buf[12] & 0x01) != 0x01) continue;
585 *dest = ( (ULLONG)(buf[8] & 0x0E) << 29 ) |
586 ( (ULLONG)(buf[9]) << 22 ) |
587 ( (ULLONG)(buf[10] & 0xFE) << 14 ) |
588 ( (ULLONG)(buf[11]) << 7 ) |
589 ( (ULLONG)(buf[12] & 0xFE) >> 1 );
594 buf += framelength; len -= framelength;