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|
/* $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.fr/>.
It may be used under the terms of the GNU General Public License. */
#include "hb.h"
#include "hbffmpeg.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
#define NTAGS 8
/**********************************************************************
* hb_libmpeg2_t
*********************************************************************/
typedef struct hb_libmpeg2_s
{
mpeg2dec_t * libmpeg2;
const mpeg2_info_t * info;
hb_job_t * job;
hb_title_t * title;
int width;
int height;
int rate;
double aspect_ratio;
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 */
int cur_tag; /* index of current tag */
uint32_t nframes; /* number of frames we've decoded */
int64_t last_pts;
int64_t first_pts;
int cadence[12];
int flag;
hb_list_t * list_subtitle;
hb_buffer_t * last_cc1_buf;
struct {
int64_t start; // start time of this frame
hb_buffer_t * cc_buf; // captions for this frame
} tags[NTAGS];
} hb_libmpeg2_t;
/**********************************************************************
* hb_libmpeg2_init
**********************************************************************
*
*********************************************************************/
static 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->first_pts = -1;
int i;
for ( i = 0; i < NTAGS; ++i )
{
m->tags[i].start = -1;
}
return m;
}
// send cc_buf to the CC decoder(s)
static void cc_send_to_decoder( hb_libmpeg2_t *m, hb_buffer_t *cc_buf )
{
hb_subtitle_t *subtitle;
// if there's more than one decoder for the captions send a copy
// of the buffer to all but the last. Then send the buffer to
// the last one (usually there's just one decoder so the 'while' is skipped).
int i = 0, n = hb_list_count( m->list_subtitle );
while ( --n > 0 )
{
// make a copy of the buf then forward it to the decoder
hb_buffer_t *cpy = hb_buffer_init( cc_buf->size );
hb_buffer_copy_settings( cpy, cc_buf );
memcpy( cpy->data, cc_buf->data, cc_buf->size );
subtitle = hb_list_item( m->list_subtitle, i++ );
hb_fifo_push( subtitle->fifo_in, cpy );
}
subtitle = hb_list_item( m->list_subtitle, i );
hb_fifo_push( subtitle->fifo_in, cc_buf );
}
static void hb_mpeg2_cc( hb_libmpeg2_t *m, const uint8_t *cc_block )
{
uint8_t cc_hdr = *cc_block;
if ( ( cc_hdr & 0x4 ) == 0 )
// not valid - ignore
return;
switch (cc_hdr & 3)
{
case 0:
// CC1 stream
if ( ( cc_block[1] & 0x7f ) == 0 && ( cc_block[2] & 0x7f ) == 0 )
// just padding - ignore
return;
if ( m->last_cc1_buf )
{
// new data from the same time as last call - add to buffer
int len = m->last_cc1_buf->size;
hb_buffer_realloc( m->last_cc1_buf, len + 2 );
memcpy( m->last_cc1_buf->data + len, cc_block+1, 2 );
m->last_cc1_buf->size = len + 2;
return;
}
// allocate a new buffer and copy the caption data into it.
// (we don't send it yet because we don't know what timestamp to use).
hb_buffer_t *cc_buf = hb_buffer_init( 2 );
if( !cc_buf )
return;
memcpy( cc_buf->data, cc_block+1, 2 );
m->last_cc1_buf = cc_buf;
break;
#ifdef notyet
case 1:
// CC2 stream
//process608( cc_block+1, 2, &m->cc608 );
break;
case 2: //EIA-708
// DTVCC packet data
// Fall through
case 3: //EIA-708
{
uint8_t temp[4];
temp[0]=cc_valid;
temp[1]=cc_type;
temp[2]=cc_block[1];
temp[3]=cc_block[2];
do_708 ((const unsigned char *) temp, 4);
}
break;
#endif
default:
break;
}
}
static inline int have_captions( const uint8_t *user_data, uint32_t len )
{
return len >= 6 &&
( ( user_data[0] == 0x43 && user_data[1] == 0x43 ) ||
( user_data[0] == 0x47 && user_data[1] == 0x41 &&
user_data[2] == 0x39 && user_data[3] == 0x34 &&
user_data[4] == 3 && (user_data[5] & 0x40) ) );
}
static void do_one_dvd_cc( hb_libmpeg2_t *m, const uint8_t *header, int field1 )
{
uint8_t data[3];
data[0] = ( header[0] == 0xff && 0 == field1 )? 0x04 : 0x05;
data[1] = header[1];
data[2] = header[2];
hb_mpeg2_cc( m, data );
data[0] = ( header[3] == 0xff && 1 == field1 )? 0x04 : 0x05;
data[1] = header[4];
data[2] = header[5];
hb_mpeg2_cc( m, data );
}
// extract all the captions in the current frame and send them downstream
// to the decoder.
//
// (this routine should only be called if there are captions in the current
// frame. I.e., only if a call to 'have_captions' returns true.)
static void extract_mpeg2_captions( hb_libmpeg2_t *m )
{
const uint8_t *user_data = m->info->user_data;
int dvd_captions = user_data[0] == 0x43;
int capcount, field1packet = 0;
const uint8_t *header = &user_data[4];
if ( !dvd_captions )
{
// ATSC encapsulated captions - header starts one byte later
// and has an extra unused byte following it.
capcount = header[1] & 0x1f;
header += 3;
}
else
{
// DVD captions
if ( ( header[0] & 0x80 ) == 0x00 )
field1packet=1; /* expect Field 1 second */
capcount=(header[0] & 0x1e) / 2;
header++;
}
int i;
for( i=0; i<capcount; i++ )
{
if ( !dvd_captions )
{
hb_mpeg2_cc( m, header );
header += 3;
}
else
{
do_one_dvd_cc( m, header, field1packet );
header += 6;
}
}
if ( dvd_captions )
{
// Deal with extra closed captions some DVDs have.
while( header[0]==0xfe || header[0]==0xff )
{
do_one_dvd_cc( m, header, field1packet );
header += 6;
}
}
}
static void next_tag( hb_libmpeg2_t *m, hb_buffer_t *buf_es )
{
m->cur_tag = ( m->cur_tag + 1 ) & (NTAGS-1);
if ( m->tags[m->cur_tag].start >= 0 || m->tags[m->cur_tag].cc_buf )
{
if ( m->tags[m->cur_tag].start < 0 ||
( m->got_iframe && m->tags[m->cur_tag].start >= m->first_pts ) )
hb_log("mpeg2 tag botch: pts %lld, tag pts %lld buf 0x%p",
buf_es->start, m->tags[m->cur_tag].start, m->tags[m->cur_tag].cc_buf);
if ( m->tags[m->cur_tag].cc_buf )
hb_buffer_close( &m->tags[m->cur_tag].cc_buf );
}
m->tags[m->cur_tag].start = buf_es->start;
mpeg2_tag_picture( m->libmpeg2, m->cur_tag, 0 );
}
static hb_buffer_t *hb_copy_frame( hb_job_t *job, int width, int height,
uint8_t* y, uint8_t *u, uint8_t *v )
{
int dst_w = width, dst_h = height;
if ( job )
{
dst_w = job->title->width;
dst_h = job->title->height;
}
int dst_wh = dst_w * dst_h;
hb_buffer_t *buf = hb_video_buffer_init( dst_w, dst_h );
buf->start = -1;
if ( dst_w != width || dst_h != height )
{
// we're encoding and the frame dimensions don't match the title dimensions -
// rescale & matte Y, U, V into our output buf.
AVPicture in, out;
avpicture_alloc(&in, PIX_FMT_YUV420P, width, height );
avpicture_alloc(&out, PIX_FMT_YUV420P, dst_w, dst_h );
int src_wh = width * height;
memcpy( in.data[0], y, src_wh );
memcpy( in.data[1], u, src_wh >> 2 );
memcpy( in.data[2], v, src_wh >> 2 );
struct SwsContext *context = sws_getContext( width, height, PIX_FMT_YUV420P,
dst_w, dst_h, PIX_FMT_YUV420P,
SWS_LANCZOS|SWS_ACCURATE_RND,
NULL, NULL, NULL );
sws_scale( context, in.data, in.linesize, 0, height, out.data, out.linesize );
sws_freeContext( context );
uint8_t *data = buf->data;
memcpy( data, out.data[0], dst_wh );
data += dst_wh;
// U & V planes are 1/4 the size of Y plane.
dst_wh >>= 2;
memcpy( data, out.data[1], dst_wh );
data += dst_wh;
memcpy( data, out.data[2], dst_wh );
avpicture_free( &out );
avpicture_free( &in );
}
else
{
// we're scanning or the frame dimensions match the title's dimensions
// so we can do a straight copy.
uint8_t *data = buf->data;
memcpy( data, y, dst_wh );
data += dst_wh;
// U & V planes are 1/4 the size of Y plane.
dst_wh >>= 2;
memcpy( data, u, dst_wh );
data += dst_wh;
memcpy( data, v, dst_wh );
}
return buf;
}
/**********************************************************************
* hb_libmpeg2_decode
**********************************************************************
*
*********************************************************************/
static 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;
if ( buf_es->size )
{
/* Feed libmpeg2 */
if( buf_es->start >= 0 )
{
next_tag( m, buf_es );
}
mpeg2_buffer( m->libmpeg2, buf_es->data, buf_es->data + buf_es->size );
}
for( ;; )
{
state = mpeg2_parse( m->libmpeg2 );
if( state == STATE_BUFFER )
{
/* Require some more data */
break;
}
// if the user requested captions, process
// any captions found in the current frame.
if ( m->list_subtitle && m->last_pts >= 0 &&
have_captions( m->info->user_data, m->info->user_data_len ) )
{
extract_mpeg2_captions( m );
// if we don't have a tag for the captions, make one
if ( m->last_cc1_buf && m->tags[m->cur_tag].cc_buf != m->last_cc1_buf )
{
if (m->tags[m->cur_tag].cc_buf)
{
hb_log("mpeg2 tag botch2: pts %lld, tag pts %lld buf 0x%p",
buf_es->start, m->tags[m->cur_tag].start, m->tags[m->cur_tag].cc_buf);
hb_buffer_close( &m->tags[m->cur_tag].cc_buf );
}
// see if we already made a tag for the timestamp. If so we
// can just use it, otherwise make a new tag.
if (m->tags[m->cur_tag].start < 0)
{
next_tag( m, buf_es );
}
m->tags[m->cur_tag].cc_buf = m->last_cc1_buf;
}
}
if( state == STATE_SEQUENCE )
{
if( !( m->width && m->height && m->rate ) )
{
m->width = m->info->sequence->width;
m->height = m->info->sequence->height;
m->rate = m->info->sequence->frame_period;
if ( m->aspect_ratio <= 0 && m->height &&
m->info->sequence->pixel_height )
{
/* 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.
*/
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;
}
}
}
else if( state == STATE_GOP && m->look_for_break)
{
// 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 )
{
m->last_cc1_buf = NULL;
if( !m->got_iframe && ( 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( m->got_iframe )
{
buf = hb_copy_frame( m->job, m->info->sequence->width,
m->info->sequence->height,
m->info->display_fbuf->buf[0],
m->info->display_fbuf->buf[1],
m->info->display_fbuf->buf[2] );
buf->sequence = buf_es->sequence;
hb_buffer_t *cc_buf = NULL;
if( m->info->display_picture->flags & PIC_FLAG_TAGS )
{
int t = m->info->display_picture->tag;
buf->start = m->tags[t].start;
cc_buf = m->tags[t].cc_buf;
m->tags[t].start = -1;
m->tags[t].cc_buf = NULL;
}
if( buf->start < 0 && m->last_pts >= 0 )
{
/* For some reason nb_fields is sometimes 1 while it
should be 2 */
buf->start = m->last_pts +
MAX( 2, m->info->display_picture->nb_fields ) *
m->info->sequence->frame_period / 600;
}
if ( buf->start >= 0 )
{
m->last_pts = buf->start;
}
// if we were accumulating captions we now know the timestamp
// so ship them to the decoder.
if ( cc_buf )
{
cc_buf->start = m->last_pts;
cc_send_to_decoder( m, cc_buf );
}
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 %"PRId64,
chap_name, buf->new_chap, m->nframes, buf->start );
}
else if ( m->nframes == 0 )
{
// this is the first frame returned by the decoder
m->first_pts = buf->start;
if ( 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 %"PRId64,
c->title, m->job->chapter_start, m->nframes, buf->start );
}
}
++m->nframes;
m->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( m->flag & TOP_FIRST )
hb_log("MPEG2 Flag: Top field first");
if( m->flag & PROGRESSIVE )
hb_log("MPEG2 Flag: Progressive");
if( m->flag & COMPOSITE )
hb_log("MPEG2 Flag: Composite");
if( m->flag & SKIP )
hb_log("MPEG2 Flag: Skip!");
if( m->flag & TAGS )
hb_log("MPEG2 Flag: TAGS");
if(fm->lag & REPEAT_FIRST )
hb_log("MPEG2 Flag: Repeat first field");
if( m->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--)
{
m->cadence[i] = m->cadence[i-1];
}
if ( !(m->flag & PROGRESSIVE) && !(m->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.");
m->cadence[0] = BT;
}
else if ( !(m->flag & PROGRESSIVE) && (m->flag & TOP_FIRST) )
{
/* Not progressive, top is first,
Two fields displayed.
*/
//hb_log("MPEG2 Flag: Top field first, 2 fields displayed.");
m->cadence[0] = TB;
}
else if ( (m->flag & PROGRESSIVE) && !(m->flag & TOP_FIRST) && !( m->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.");
m->cadence[0] = BT_PROG;
}
else if ( (m->flag & PROGRESSIVE) && !(m->flag & TOP_FIRST) && ( m->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.");
m->cadence[0] = BTB_PROG;
}
else if ( (m->flag & PROGRESSIVE) && (m->flag & TOP_FIRST) && !( m->flag & REPEAT_FIRST ) )
{
/* Progressive, top first.
That means top first,
2 fields displayed.
*/
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