/* $Id: decmpeg2.c,v 1.12 2005/03/03 16:30:42 titer Exp $
This file is part of the HandBrake source code.
- Homepage: <http://handbrake.m0k.org/>.
+ Homepage: <http://handbrake.fr/>.
It may be used under the terms of the GNU General Public License. */
#include "hb.h"
#include "mpeg2dec/mpeg2.h"
+/* Cadence tracking */
+#ifndef PIC_FLAG_REPEAT_FIRST_FIELD
+#define PIC_FLAG_REPEAT_FIRST_FIELD 256
+#endif
+#define TOP_FIRST PIC_FLAG_TOP_FIELD_FIRST
+#define PROGRESSIVE PIC_FLAG_PROGRESSIVE_FRAME
+#define COMPOSITE PIC_FLAG_COMPOSITE_DISPLAY
+#define SKIP PIC_FLAG_SKIP
+#define TAGS PIC_FLAG_TAGS
+#define REPEAT_FIRST PIC_FLAG_REPEAT_FIRST_FIELD
+#define COMPOSITE_MASK PIC_MASK_COMPOSITE_DISPLAY
+#define TB 8
+#define BT 16
+#define BT_PROG 32
+#define BTB_PROG 64
+#define TB_PROG 128
+#define TBT_PROG 256
+int cadence[12];
+int flag = 0;
+
/**********************************************************************
* hb_libmpeg2_t
**********************************************************************
{
mpeg2dec_t * libmpeg2;
const mpeg2_info_t * info;
+ hb_job_t * job;
int width;
int height;
int rate;
int aspect_ratio;
- int got_iframe;
- int look_for_break;
+ int got_iframe; /* set when we get our first iframe */
+ int look_for_iframe; /* need an iframe to add chap break */
+ int look_for_break; /* need gop start to add chap break */
+ uint32_t nframes; /* number of frames we've decoded */
int64_t last_pts;
};
/**********************************************************************
* hb_libmpeg2_init
**********************************************************************
- *
+ *
*********************************************************************/
hb_libmpeg2_t * hb_libmpeg2_init()
{
hb_libmpeg2_t * m = calloc( sizeof( hb_libmpeg2_t ), 1 );
-
+
m->libmpeg2 = mpeg2_init();
m->info = mpeg2_info( m->libmpeg2 );
m->last_pts = -1;
- m->look_for_break = 0;
return m;
}
/**********************************************************************
* hb_libmpeg2_decode
**********************************************************************
- *
+ *
*********************************************************************/
int hb_libmpeg2_decode( hb_libmpeg2_t * m, hb_buffer_t * buf_es,
hb_list_t * list_raw )
mpeg2_state_t state;
hb_buffer_t * buf;
uint8_t * data;
- int chap_break = 0;
- /* Feed libmpeg2 */
- if( buf_es->start > -1 )
+ if ( buf_es->size )
{
- mpeg2_tag_picture( m->libmpeg2, buf_es->start >> 32,
- buf_es->start & 0xFFFFFFFF );
+ /* Feed libmpeg2 */
+ if( buf_es->start > -1 )
+ {
+ mpeg2_tag_picture( m->libmpeg2, buf_es->start >> 32,
+ buf_es->start & 0xFFFFFFFF );
+ }
+ mpeg2_buffer( m->libmpeg2, buf_es->data,
+ buf_es->data + buf_es->size );
}
- mpeg2_buffer( m->libmpeg2, buf_es->data,
- buf_es->data + buf_es->size );
for( ;; )
{
m->width = m->info->sequence->width;
m->height = m->info->sequence->height;
m->rate = m->info->sequence->frame_period;
-
- if( m->rate == 900900 )
- {
- /* 29.97 fps. 3:2 pulldown might, or might not be
- used. I can't find a way to know, so we always
- output 23.976 */
- m->rate = 1126125;
- }
- }
- if ( m->aspect_ratio <= 0 )
- {
- // We can parse out the aspect ratio from the Sequence Start Header data in buf_es->data
-
- // Make sure we have the correct data in the buffer
- if ((buf_es->data[0] == 0x00) && (buf_es->data[1] == 0x00) && (buf_es->data[2] == 0x01) && (buf_es->data[3] == 0xb3))
- {
- unsigned char ar_fr = buf_es->data[7]; // Top 4 bits == aspect ratio flag - bottom 4 bits == rate flags
- switch ((ar_fr & 0xf0) >> 4)
+ if ( m->aspect_ratio <= 0 && m->height &&
+ m->info->sequence->pixel_height )
{
- case 2:
- m->aspect_ratio = HB_ASPECT_BASE * 4 / 3; // 4:3
- break;
- case 3:
- m->aspect_ratio = HB_ASPECT_BASE * 16 / 9; // 16:9
- break;
- default:
- hb_log("hb_libmpeg2_decode - STATE_SEQUENCE unexpected aspect ratio/frame rate 0x%x\n", ar_fr);
- break;
+ /* mpeg2_parse doesn't store the aspect ratio. Instead
+ * it keeps the pixel width & height that would cause
+ * the storage width & height to come out in the correct
+ * aspect ratio. Convert these back to aspect ratio.
+ * We do the calc in floating point to get the rounding right.
+ * We round in the second decimal digit because we scale
+ * the (integer) aspect by 9 to preserve the 1st digit.
+ */
+ double ar_numer = m->width * m->info->sequence->pixel_width;
+ double ar_denom = m->height * m->info->sequence->pixel_height;
+ m->aspect_ratio = ( ar_numer / ar_denom + .05 ) * HB_ASPECT_BASE;
}
- }
}
}
- else if( state == STATE_GOP && m->look_for_break == 2)
+ else if( state == STATE_GOP && m->look_for_break)
{
- printf("MPEG2: Group of pictures found, searching for I-Frame\n");
- m->look_for_break = 1;
+ // we were looking for a gop to add a chapter break - we found it
+ // so now start looking for an iframe.
+ m->look_for_iframe = m->look_for_break;
+ m->look_for_break = 0;
}
else if( ( state == STATE_SLICE || state == STATE_END ) &&
m->info->display_fbuf )
if( ( m->info->display_picture->flags &
PIC_MASK_CODING_TYPE ) == PIC_FLAG_CODING_TYPE_I )
{
+ // we got an iframe so we can start decoding video now
m->got_iframe = 1;
-
- // If we are looking for a break, insert the chapter break on an I-Frame
- if( m->look_for_break == 1 )
- {
- printf("MPEG2: I-Frame Found\n");
- m->look_for_break = 0;
- chap_break = 1;
- }
}
if( m->got_iframe )
buf = hb_buffer_init( m->width * m->height * 3 / 2 );
data = buf->data;
- // Was a good break point found?
- if( chap_break )
- {
- printf("MPEG2: Chapter Break Inserted\n");
- chap_break = 0;
- buf->new_chap = 1;
- }
+ buf->sequence = buf_es->sequence;
memcpy( data, m->info->display_fbuf->buf[0],
m->width * m->height );
}
m->last_pts = buf->start;
+ if( m->look_for_iframe && ( m->info->display_picture->flags &
+ PIC_MASK_CODING_TYPE ) == PIC_FLAG_CODING_TYPE_I )
+ {
+ // we were waiting for an iframe to insert a chapter mark
+ // and we have one.
+ buf->new_chap = m->look_for_iframe;
+ m->look_for_iframe = 0;
+ const char *chap_name = "";
+ if ( m->job && buf->new_chap > 0 &&
+ hb_list_item( m->job->title->list_chapter,
+ buf->new_chap - 1 ) )
+ {
+ hb_chapter_t * c = hb_list_item( m->job->title->list_chapter,
+ buf->new_chap - 1 );
+ chap_name = c->title;
+ }
+ hb_log( "mpeg2: \"%s\" (%d) at frame %u time %lld",
+ chap_name, buf->new_chap, m->nframes, buf->start );
+ } else if ( m->nframes == 0 && m->job &&
+ hb_list_item( m->job->title->list_chapter,
+ m->job->chapter_start - 1 ) )
+ {
+ hb_chapter_t * c = hb_list_item( m->job->title->list_chapter,
+ m->job->chapter_start - 1 );
+ hb_log( "mpeg2: \"%s\" (%d) at frame %u time %lld", c->title,
+ m->job->chapter_start, m->nframes, buf->start );
+ }
+ ++m->nframes;
+
+ flag = m->info->display_picture->flags;
+
+/* Uncomment this block to see frame-by-frame picture flags, as the video encodes.
+ hb_log("***** MPEG 2 Picture Info for PTS %lld *****", buf->start);
+ if( flag & TOP_FIRST )
+ hb_log("MPEG2 Flag: Top field first");
+ if( flag & PROGRESSIVE )
+ hb_log("MPEG2 Flag: Progressive");
+ if( flag & COMPOSITE )
+ hb_log("MPEG2 Flag: Composite");
+ if( flag & SKIP )
+ hb_log("MPEG2 Flag: Skip!");
+ if( flag & TAGS )
+ hb_log("MPEG2 Flag: TAGS");
+ if(flag & REPEAT_FIRST )
+ hb_log("MPEG2 Flag: Repeat first field");
+ if( flag & COMPOSITE_MASK )
+ hb_log("MPEG2 Flag: Composite mask");
+ hb_log("fields: %d", m->info->display_picture->nb_fields);
+*/
+ /* Rotate the cadence tracking. */
+ int i = 0;
+ for(i=11; i > 0; i--)
+ {
+ cadence[i] = cadence[i-1];
+ }
+
+ if ( !(flag & PROGRESSIVE) && !(flag & TOP_FIRST) )
+ {
+ /* Not progressive, not top first...
+ That means it's probably bottom
+ first, 2 fields displayed.
+ */
+ //hb_log("MPEG2 Flag: Bottom field first, 2 fields displayed.");
+ cadence[0] = BT;
+ }
+ else if ( !(flag & PROGRESSIVE) && (flag & TOP_FIRST) )
+ {
+ /* Not progressive, top is first,
+ Two fields displayed.
+ */
+ //hb_log("MPEG2 Flag: Top field first, 2 fields displayed.");
+ cadence[0] = TB;
+ }
+ else if ( (flag & PROGRESSIVE) && !(flag & TOP_FIRST) && !( flag & REPEAT_FIRST ) )
+ {
+ /* Progressive, but noting else.
+ That means Bottom first,
+ 2 fields displayed.
+ */
+ //hb_log("MPEG2 Flag: Progressive. Bottom field first, 2 fields displayed.");
+ cadence[0] = BT_PROG;
+ }
+ else if ( (flag & PROGRESSIVE) && !(flag & TOP_FIRST) && ( flag & REPEAT_FIRST ) )
+ {
+ /* Progressive, and repeat. .
+ That means Bottom first,
+ 3 fields displayed.
+ */
+ //hb_log("MPEG2 Flag: Progressive repeat. Bottom field first, 3 fields displayed.");
+ cadence[0] = BTB_PROG;
+ }
+ else if ( (flag & PROGRESSIVE) && (flag & TOP_FIRST) && !( flag & REPEAT_FIRST ) )
+ {
+ /* Progressive, top first.
+ That means top first,
+ 2 fields displayed.
+ */
+ //hb_log("MPEG2 Flag: Progressive. Top field first, 2 fields displayed.");
+ cadence[0] = TB_PROG;
+ }
+ else if ( (flag & PROGRESSIVE) && (flag & TOP_FIRST) && ( flag & REPEAT_FIRST ) )
+ {
+ /* Progressive, top, repeat.
+ That means top first,
+ 3 fields displayed.
+ */
+ //hb_log("MPEG2 Flag: Progressive repeat. Top field first, 3 fields displayed.");
+ cadence[0] = TBT_PROG;
+ }
+
+ if ( (cadence[2] <= TB) && (cadence[1] <= TB) && (cadence[0] > TB) && (cadence[11]) )
+ hb_log("%fs: Video -> Film", (float)buf->start / 90000);
+ if ( (cadence[2] > TB) && (cadence[1] <= TB) && (cadence[0] <= TB) && (cadence[11]) )
+ hb_log("%fs: Film -> Video", (float)buf->start / 90000);
+
+ /* Store picture flags for later use by filters */
+ buf->flags = m->info->display_picture->flags;
+
hb_list_add( list_raw, buf );
}
}
/**********************************************************************
* hb_libmpeg2_info
**********************************************************************
- *
+ *
*********************************************************************/
void hb_libmpeg2_info( hb_libmpeg2_t * m, int * width, int * height,
int * rate, int *aspect_ratio )
{
*width = m->width;
*height = m->height;
+ if (m->info->display_fbuf)
+ {
+ if( (m->info->display_picture->flags & PROGRESSIVE) && (m->height == 480) )
+ {
+ /* The frame is progressive and it's NTSC DVD height, so change its FPS to 23.976.
+ This might not be correct for the title. It's really just for scan.c's benefit.
+ Scan.c will reset the fps to 29.97, until a simple majority of the preview
+ frames report at 23.976.
+ */
+ //hb_log("Detecting NTSC Progressive Frame");
+ m->rate = 1126125;
+ }
+ }
*rate = m->rate;
*aspect_ratio = m->aspect_ratio;
}
+int hb_libmpeg2_clear_aspect_ratio( hb_libmpeg2_t * m )
+{
+ int ar = m->aspect_ratio;
+ m->aspect_ratio = 0;
+ return ar;
+}
+
/**********************************************************************
* hb_libmpeg2_close
**********************************************************************
- *
+ *
*********************************************************************/
void hb_libmpeg2_close( hb_libmpeg2_t ** _m )
{
/**********************************************************************
* The decmpeg2 work object
**********************************************************************
- *
+ *
*********************************************************************/
struct hb_work_private_s
{
/**********************************************************************
* hb_work_decmpeg2_init
**********************************************************************
- *
+ *
*********************************************************************/
int decmpeg2Init( hb_work_object_t * w, hb_job_t * job )
{
hb_work_private_t * pv;
-
+
pv = calloc( 1, sizeof( hb_work_private_t ) );
w->private_data = pv;
-
+
pv->libmpeg2 = hb_libmpeg2_init();
pv->list = hb_list_init();
+ pv->libmpeg2->job = job;
+
return 0;
}
/**********************************************************************
* Work
**********************************************************************
- *
+ *
*********************************************************************/
int decmpeg2Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out )
{
hb_work_private_t * pv = w->private_data;
hb_buffer_t * buf, * last = NULL;
+ int status = HB_WORK_OK;
// The reader found a chapter break, consume it completely, and remove it from the
// stream. We need to shift it.
if( (*buf_in)->new_chap )
{
- printf("MPEG2: Chapter Break Cell Found, searching for GOP\n");
- pv->libmpeg2->look_for_break = 2;
+ pv->libmpeg2->look_for_break = (*buf_in)->new_chap;
(*buf_in)->new_chap = 0;
}
hb_libmpeg2_decode( pv->libmpeg2, *buf_in, pv->list );
+ /* if we got an empty buffer signaling end-of-stream send it downstream */
+ if ( (*buf_in)->size == 0 )
+ {
+ hb_list_add( pv->list, *buf_in );
+ *buf_in = NULL;
+ status = HB_WORK_DONE;
+ }
+
*buf_out = NULL;
while( ( buf = hb_list_item( pv->list, 0 ) ) )
{
}
}
- return HB_WORK_OK;
+ return status;
}
/**********************************************************************
* Close
**********************************************************************
- *
+ *
*********************************************************************/
void decmpeg2Close( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
+ hb_log( "mpeg2 done: %d frames", pv->libmpeg2->nframes );
hb_list_close( &pv->list );
hb_libmpeg2_close( &pv->libmpeg2 );
free( pv );
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