/* $Id: decmpeg2.c,v 1.12 2005/03/03 16:30:42 titer Exp $ This file is part of the HandBrake source code. Homepage: . 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 static int cadence[12]; static int flag = 0; /********************************************************************** * hb_libmpeg2_t *********************************************************************/ typedef struct hb_libmpeg2_s { mpeg2dec_t * libmpeg2; const mpeg2_info_t * info; hb_job_t * job; 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 */ uint32_t nframes; /* number of frames we've decoded */ int64_t last_pts; } 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; return m; } /********************************************************************** * 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; uint8_t * data; if ( buf_es->size ) { /* 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 ); } for( ;; ) { state = mpeg2_parse( m->libmpeg2 ); if( state == STATE_BUFFER ) { /* Require some more data */ break; } else 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 ) { 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( m->got_iframe ) { buf = hb_buffer_init( m->width * m->height * 3 / 2 ); data = buf->data; buf->sequence = buf_es->sequence; memcpy( data, m->info->display_fbuf->buf[0], m->width * m->height ); data += m->width * m->height; memcpy( data, m->info->display_fbuf->buf[1], m->width * m->height / 4 ); data += m->width * m->height / 4; memcpy( data, m->info->display_fbuf->buf[2], m->width * m->height / 4 ); if( m->info->display_picture->flags & PIC_FLAG_TAGS ) { buf->start = ( (uint64_t) m->info->display_picture->tag << 32 ) | ( (uint64_t) m->info->display_picture->tag2 ); /* * Add back in again to track PTS of MPEG2 frames * hb_log("MPEG2: Normal buf->start = %lld", buf->start); */ } else if( m->last_pts > -1 ) { /* 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; } else { buf->start = -1; } 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 ); } } else if( state == STATE_INVALID ) { mpeg2_reset( m->libmpeg2, 0 ); } } return 1; } /********************************************************************** * hb_libmpeg2_close ********************************************************************** * *********************************************************************/ static void hb_libmpeg2_close( hb_libmpeg2_t ** _m ) { hb_libmpeg2_t * m = *_m; mpeg2_close( m->libmpeg2 ); free( m ); *_m = NULL; } /********************************************************************** * The decmpeg2 work object ********************************************************************** * *********************************************************************/ struct hb_work_private_s { hb_libmpeg2_t * libmpeg2; hb_list_t * list; }; /********************************************************************** * hb_work_decmpeg2_init ********************************************************************** * *********************************************************************/ static 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 ********************************************************************** * *********************************************************************/ static 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 ) { 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 ) ) ) { hb_list_rem( pv->list, buf ); if( last ) { last->next = buf; last = buf; } else { *buf_out = buf; last = buf; } } return status; } /********************************************************************** * Close ********************************************************************** * *********************************************************************/ static void decmpeg2Close( hb_work_object_t * w ) { hb_work_private_t * pv = w->private_data; // don't log during scan if ( pv->libmpeg2->job ) { hb_log( "mpeg2 done: %d frames", pv->libmpeg2->nframes ); } hb_list_close( &pv->list ); hb_libmpeg2_close( &pv->libmpeg2 ); free( pv ); } static int decmpeg2Info( hb_work_object_t *w, hb_work_info_t *info ) { hb_work_private_t *pv = w->private_data; if ( pv && pv->libmpeg2 && pv->libmpeg2->info && pv->libmpeg2->info->sequence ) { hb_libmpeg2_t *m = pv->libmpeg2; info->width = m->width; info->height = m->height; info->pixel_aspect_width = m->info->sequence->pixel_width; info->pixel_aspect_height = m->info->sequence->pixel_height; info->aspect = m->aspect_ratio; // if the frame is progressive & NTSC DVD height report it as 23.976 FPS // so that scan can autodetect NTSC film info->rate = 27000000; info->rate_base = ( m->info->display_fbuf && m->info->display_picture && (m->info->display_picture->flags & PROGRESSIVE) && (m->height == 480 ) ) ? 1126125 : m->rate; info->bitrate = m->info->sequence->byte_rate * 8; info->profile = m->info->sequence->profile_level_id >> 4; info->level = m->info->sequence->profile_level_id & 0xf; info->name = "mpeg2"; return 1; } return 0; } hb_work_object_t hb_decmpeg2 = { WORK_DECMPEG2, "MPEG-2 decoder (libmpeg2)", decmpeg2Init, decmpeg2Work, decmpeg2Close, decmpeg2Info };