1 /* $Id: decmpeg2.c,v 1.12 2005/03/03 16:30:42 titer Exp $
3 This file is part of the HandBrake source code.
4 Homepage: <http://handbrake.fr/>.
5 It may be used under the terms of the GNU General Public License. */
9 #include "mpeg2dec/mpeg2.h"
11 /* Cadence tracking */
12 #ifndef PIC_FLAG_REPEAT_FIRST_FIELD
13 #define PIC_FLAG_REPEAT_FIRST_FIELD 256
15 #define TOP_FIRST PIC_FLAG_TOP_FIELD_FIRST
16 #define PROGRESSIVE PIC_FLAG_PROGRESSIVE_FRAME
17 #define COMPOSITE PIC_FLAG_COMPOSITE_DISPLAY
18 #define SKIP PIC_FLAG_SKIP
19 #define TAGS PIC_FLAG_TAGS
20 #define REPEAT_FIRST PIC_FLAG_REPEAT_FIRST_FIELD
21 #define COMPOSITE_MASK PIC_MASK_COMPOSITE_DISPLAY
28 static int cadence[12];
31 /**********************************************************************
33 *********************************************************************/
34 typedef struct hb_libmpeg2_s
36 mpeg2dec_t * libmpeg2;
37 const mpeg2_info_t * info;
43 int got_iframe; /* set when we get our first iframe */
44 int look_for_iframe; /* need an iframe to add chap break */
45 int look_for_break; /* need gop start to add chap break */
46 uint32_t nframes; /* number of frames we've decoded */
50 /**********************************************************************
52 **********************************************************************
54 *********************************************************************/
55 static hb_libmpeg2_t * hb_libmpeg2_init()
57 hb_libmpeg2_t * m = calloc( sizeof( hb_libmpeg2_t ), 1 );
59 m->libmpeg2 = mpeg2_init();
60 m->info = mpeg2_info( m->libmpeg2 );
66 /**********************************************************************
68 **********************************************************************
70 *********************************************************************/
71 static int hb_libmpeg2_decode( hb_libmpeg2_t * m, hb_buffer_t * buf_es,
72 hb_list_t * list_raw )
81 if( buf_es->start > -1 )
83 mpeg2_tag_picture( m->libmpeg2, buf_es->start >> 32,
84 buf_es->start & 0xFFFFFFFF );
86 mpeg2_buffer( m->libmpeg2, buf_es->data,
87 buf_es->data + buf_es->size );
92 state = mpeg2_parse( m->libmpeg2 );
93 if( state == STATE_BUFFER )
95 /* Require some more data */
98 else if( state == STATE_SEQUENCE )
100 if( !( m->width && m->height && m->rate ) )
102 m->width = m->info->sequence->width;
103 m->height = m->info->sequence->height;
104 m->rate = m->info->sequence->frame_period;
105 if ( m->aspect_ratio <= 0 && m->height &&
106 m->info->sequence->pixel_height )
108 /* mpeg2_parse doesn't store the aspect ratio. Instead
109 * it keeps the pixel width & height that would cause
110 * the storage width & height to come out in the correct
111 * aspect ratio. Convert these back to aspect ratio.
113 double ar_numer = m->width * m->info->sequence->pixel_width;
114 double ar_denom = m->height * m->info->sequence->pixel_height;
115 m->aspect_ratio = ar_numer / ar_denom;
119 else if( state == STATE_GOP && m->look_for_break)
121 // we were looking for a gop to add a chapter break - we found it
122 // so now start looking for an iframe.
123 m->look_for_iframe = m->look_for_break;
124 m->look_for_break = 0;
126 else if( ( state == STATE_SLICE || state == STATE_END ) &&
127 m->info->display_fbuf )
129 if( ( m->info->display_picture->flags &
130 PIC_MASK_CODING_TYPE ) == PIC_FLAG_CODING_TYPE_I )
132 // we got an iframe so we can start decoding video now
138 buf = hb_buffer_init( m->width * m->height * 3 / 2 );
141 buf->sequence = buf_es->sequence;
143 memcpy( data, m->info->display_fbuf->buf[0],
144 m->width * m->height );
145 data += m->width * m->height;
146 memcpy( data, m->info->display_fbuf->buf[1],
147 m->width * m->height / 4 );
148 data += m->width * m->height / 4;
149 memcpy( data, m->info->display_fbuf->buf[2],
150 m->width * m->height / 4 );
152 if( m->info->display_picture->flags & PIC_FLAG_TAGS )
155 ( (uint64_t) m->info->display_picture->tag << 32 ) |
156 ( (uint64_t) m->info->display_picture->tag2 );
158 * Add back in again to track PTS of MPEG2 frames
159 * hb_log("MPEG2: Normal buf->start = %lld", buf->start);
162 else if( m->last_pts > -1 )
164 /* For some reason nb_fields is sometimes 1 while it
166 buf->start = m->last_pts +
167 MAX( 2, m->info->display_picture->nb_fields ) *
168 m->info->sequence->frame_period / 600;
174 m->last_pts = buf->start;
176 if( m->look_for_iframe && ( m->info->display_picture->flags &
177 PIC_MASK_CODING_TYPE ) == PIC_FLAG_CODING_TYPE_I )
179 // we were waiting for an iframe to insert a chapter mark
181 buf->new_chap = m->look_for_iframe;
182 m->look_for_iframe = 0;
183 const char *chap_name = "";
184 if ( m->job && buf->new_chap > 0 &&
185 hb_list_item( m->job->title->list_chapter,
186 buf->new_chap - 1 ) )
188 hb_chapter_t * c = hb_list_item( m->job->title->list_chapter,
190 chap_name = c->title;
192 hb_log( "mpeg2: \"%s\" (%d) at frame %u time %lld",
193 chap_name, buf->new_chap, m->nframes, buf->start );
194 } else if ( m->nframes == 0 && m->job &&
195 hb_list_item( m->job->title->list_chapter,
196 m->job->chapter_start - 1 ) )
198 hb_chapter_t * c = hb_list_item( m->job->title->list_chapter,
199 m->job->chapter_start - 1 );
200 hb_log( "mpeg2: \"%s\" (%d) at frame %u time %lld", c->title,
201 m->job->chapter_start, m->nframes, buf->start );
205 flag = m->info->display_picture->flags;
207 /* Uncomment this block to see frame-by-frame picture flags, as the video encodes.
208 hb_log("***** MPEG 2 Picture Info for PTS %lld *****", buf->start);
209 if( flag & TOP_FIRST )
210 hb_log("MPEG2 Flag: Top field first");
211 if( flag & PROGRESSIVE )
212 hb_log("MPEG2 Flag: Progressive");
213 if( flag & COMPOSITE )
214 hb_log("MPEG2 Flag: Composite");
216 hb_log("MPEG2 Flag: Skip!");
218 hb_log("MPEG2 Flag: TAGS");
219 if(flag & REPEAT_FIRST )
220 hb_log("MPEG2 Flag: Repeat first field");
221 if( flag & COMPOSITE_MASK )
222 hb_log("MPEG2 Flag: Composite mask");
223 hb_log("fields: %d", m->info->display_picture->nb_fields);
225 /* Rotate the cadence tracking. */
227 for(i=11; i > 0; i--)
229 cadence[i] = cadence[i-1];
232 if ( !(flag & PROGRESSIVE) && !(flag & TOP_FIRST) )
234 /* Not progressive, not top first...
235 That means it's probably bottom
236 first, 2 fields displayed.
238 //hb_log("MPEG2 Flag: Bottom field first, 2 fields displayed.");
241 else if ( !(flag & PROGRESSIVE) && (flag & TOP_FIRST) )
243 /* Not progressive, top is first,
244 Two fields displayed.
246 //hb_log("MPEG2 Flag: Top field first, 2 fields displayed.");
249 else if ( (flag & PROGRESSIVE) && !(flag & TOP_FIRST) && !( flag & REPEAT_FIRST ) )
251 /* Progressive, but noting else.
252 That means Bottom first,
255 //hb_log("MPEG2 Flag: Progressive. Bottom field first, 2 fields displayed.");
256 cadence[0] = BT_PROG;
258 else if ( (flag & PROGRESSIVE) && !(flag & TOP_FIRST) && ( flag & REPEAT_FIRST ) )
260 /* Progressive, and repeat. .
261 That means Bottom first,
264 //hb_log("MPEG2 Flag: Progressive repeat. Bottom field first, 3 fields displayed.");
265 cadence[0] = BTB_PROG;
267 else if ( (flag & PROGRESSIVE) && (flag & TOP_FIRST) && !( flag & REPEAT_FIRST ) )
269 /* Progressive, top first.
270 That means top first,
273 //hb_log("MPEG2 Flag: Progressive. Top field first, 2 fields displayed.");
274 cadence[0] = TB_PROG;
276 else if ( (flag & PROGRESSIVE) && (flag & TOP_FIRST) && ( flag & REPEAT_FIRST ) )
278 /* Progressive, top, repeat.
279 That means top first,
282 //hb_log("MPEG2 Flag: Progressive repeat. Top field first, 3 fields displayed.");
283 cadence[0] = TBT_PROG;
286 if ( (cadence[2] <= TB) && (cadence[1] <= TB) && (cadence[0] > TB) && (cadence[11]) )
287 hb_log("%fs: Video -> Film", (float)buf->start / 90000);
288 if ( (cadence[2] > TB) && (cadence[1] <= TB) && (cadence[0] <= TB) && (cadence[11]) )
289 hb_log("%fs: Film -> Video", (float)buf->start / 90000);
291 /* Store picture flags for later use by filters */
292 buf->flags = m->info->display_picture->flags;
294 hb_list_add( list_raw, buf );
297 else if( state == STATE_INVALID )
299 mpeg2_reset( m->libmpeg2, 0 );
305 /**********************************************************************
307 **********************************************************************
309 *********************************************************************/
310 static void hb_libmpeg2_close( hb_libmpeg2_t ** _m )
312 hb_libmpeg2_t * m = *_m;
314 mpeg2_close( m->libmpeg2 );
320 /**********************************************************************
321 * The decmpeg2 work object
322 **********************************************************************
324 *********************************************************************/
325 struct hb_work_private_s
327 hb_libmpeg2_t * libmpeg2;
331 /**********************************************************************
332 * hb_work_decmpeg2_init
333 **********************************************************************
335 *********************************************************************/
336 static int decmpeg2Init( hb_work_object_t * w, hb_job_t * job )
338 hb_work_private_t * pv;
340 pv = calloc( 1, sizeof( hb_work_private_t ) );
341 w->private_data = pv;
343 pv->libmpeg2 = hb_libmpeg2_init();
344 pv->list = hb_list_init();
346 pv->libmpeg2->job = job;
351 /**********************************************************************
353 **********************************************************************
355 *********************************************************************/
356 static int decmpeg2Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
357 hb_buffer_t ** buf_out )
359 hb_work_private_t * pv = w->private_data;
360 hb_buffer_t * buf, * last = NULL;
361 int status = HB_WORK_OK;
363 // The reader found a chapter break, consume it completely, and remove it from the
364 // stream. We need to shift it.
365 if( (*buf_in)->new_chap )
367 pv->libmpeg2->look_for_break = (*buf_in)->new_chap;
368 (*buf_in)->new_chap = 0;
371 hb_libmpeg2_decode( pv->libmpeg2, *buf_in, pv->list );
373 /* if we got an empty buffer signaling end-of-stream send it downstream */
374 if ( (*buf_in)->size == 0 )
376 hb_list_add( pv->list, *buf_in );
378 status = HB_WORK_DONE;
382 while( ( buf = hb_list_item( pv->list, 0 ) ) )
384 hb_list_rem( pv->list, buf );
400 /**********************************************************************
402 **********************************************************************
404 *********************************************************************/
405 static void decmpeg2Close( hb_work_object_t * w )
407 hb_work_private_t * pv = w->private_data;
409 // don't log during scan
410 if ( pv->libmpeg2->job )
412 hb_log( "mpeg2 done: %d frames", pv->libmpeg2->nframes );
414 hb_list_close( &pv->list );
415 hb_libmpeg2_close( &pv->libmpeg2 );
419 static int decmpeg2Info( hb_work_object_t *w, hb_work_info_t *info )
421 hb_work_private_t *pv = w->private_data;
423 memset( info, 0, sizeof(*info) );
425 if ( pv && pv->libmpeg2 && pv->libmpeg2->info && pv->libmpeg2->info->sequence )
427 hb_libmpeg2_t *m = pv->libmpeg2;
429 info->width = m->width;
430 info->height = m->height;
431 info->pixel_aspect_width = m->info->sequence->pixel_width;
432 info->pixel_aspect_height = m->info->sequence->pixel_height;
433 info->aspect = m->aspect_ratio;
435 // if the frame is progressive & NTSC DVD height report it as 23.976 FPS
436 // so that scan can autodetect NTSC film
437 info->rate = 27000000;
438 info->rate_base = ( m->info->display_fbuf && m->info->display_picture &&
439 (m->info->display_picture->flags & PROGRESSIVE) &&
440 (m->height == 480 ) ) ? 1126125 : m->rate;
442 info->bitrate = m->info->sequence->byte_rate * 8;
443 info->profile = m->info->sequence->profile_level_id >> 4;
444 info->level = m->info->sequence->profile_level_id & 0xf;
445 info->name = "mpeg2";
451 hb_work_object_t hb_decmpeg2 =
454 "MPEG-2 decoder (libmpeg2)",