clpi.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:6k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * clpi.c: BluRay Disc CLPI
- *****************************************************************************
- * Copyright (C) 2009 the VideoLAN team
- * $Id: 5f88fa4227d0c0ca038f878bda56f5222fe83503 $
- *
- * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <limits.h>
- #include <vlc_common.h>
- #include <vlc_bits.h>
- #include "clpi.h"
- /* */
- void bd_clpi_stc_Parse( bd_clpi_stc_t *p_stc, bs_t *s )
- {
- p_stc->i_pcr_pid = bs_read( s, 16 );
- p_stc->i_packet = bs_read( s, 32 );
- p_stc->i_start = bs_read( s, 32 );
- p_stc->i_end = bs_read( s, 32 );
- }
- void bd_clpi_stream_Parse( bd_clpi_stream_t *p_stream, bs_t *s )
- {
- p_stream->i_pid = bs_read( s, 16 );
- const int i_length = bs_read( s, 8 );
- p_stream->i_type = bs_read( s, 8 );
- /* Ignore the rest */
- if( i_length > 1 )
- bs_skip( s, 8*i_length - 8 );
- }
- void bd_clpi_ep_map_Clean( bd_clpi_ep_map_t *p_ep_map )
- {
- free( p_ep_map->p_ep );
- }
- int bd_clpi_ep_map_Parse( bd_clpi_ep_map_t *p_ep_map,
- bs_t *s, const int i_ep_map_start )
- {
- p_ep_map->i_pid = bs_read( s, 16 );
- bs_skip( s, 10 );
- p_ep_map->i_type = bs_read( s, 4 );
- const int i_coarse = bs_read( s, 16 );
- const int i_fine = bs_read( s, 18 );
- const uint32_t i_coarse_start = bs_read( s, 32 );
- p_ep_map->i_ep = i_fine;
- p_ep_map->p_ep = calloc( i_fine, sizeof(*p_ep_map->p_ep) );
- if( !p_ep_map->p_ep )
- return VLC_EGENERIC;
- bs_t cs = *s;
- bs_skip( &cs, 8*(i_ep_map_start + i_coarse_start) - bs_pos( s ) );
- const uint32_t i_fine_start = bs_read( &cs, 32 );
- for( int i = 0; i < i_coarse; i++ )
- {
- const int i_fine_id = bs_read( &cs, 18 );
- const int i_pts = bs_read( &cs, 14 );
- const uint32_t i_packet = bs_read( &cs, 32 );
- for( int j = i_fine_id; j < p_ep_map->i_ep; j++ )
- {
- p_ep_map->p_ep[j].i_pts = (int64_t)(i_pts & ~1) << 19;
- p_ep_map->p_ep[j].i_packet = i_packet & ~( (1 << 17) - 1 );
- }
- }
- bs_t fs = *s;
- bs_skip( &fs, 8*(i_ep_map_start + i_coarse_start + i_fine_start) - bs_pos( s ) );
- for( int i = 0; i < i_fine; i++ )
- {
- const bool b_angle_point = bs_read( &fs, 1 );
- bs_skip( &fs, 3 ); /* I end position offset */
- const int i_pts = bs_read( &fs, 11 );
- const int i_packet = bs_read( &fs, 17 );
- p_ep_map->p_ep[i].b_angle_point = b_angle_point;
- p_ep_map->p_ep[i].i_pts |= i_pts << 9;
- p_ep_map->p_ep[i].i_packet |= i_packet;
- }
- return VLC_SUCCESS;
- }
- void bd_clpi_Clean( bd_clpi_t *p_clpi )
- {
- free( p_clpi->p_stc );
- free( p_clpi->p_stream );
- for( int i = 0; i < p_clpi->i_ep_map; i++ )
- bd_clpi_ep_map_Clean( &p_clpi->p_ep_map[i] );
- free( p_clpi->p_ep_map );
- }
- int bd_clpi_Parse( bd_clpi_t *p_clpi, bs_t *s, int i_id )
- {
- const int i_start = bs_pos( s ) / 8;
- /* */
- if( bs_read( s, 32 ) != 0x48444D56 )
- return VLC_EGENERIC;
- const uint32_t i_version = bs_read( s, 32 );
- if( i_version != 0x30313030 && i_version != 0x30323030 )
- return VLC_EGENERIC;
- /* */
- const uint32_t i_sequence_start = bs_read( s, 32 );
- const uint32_t i_program_start = bs_read( s, 32 );
- const uint32_t i_cpi_start = bs_read( s, 32 );
- bs_skip( s, 32 ); /* mark start */
- bs_skip( s, 32 ); /* extension start */
- /* */
- p_clpi->i_id = i_id;
- /* Read sequence */
- bs_t ss = *s;
- bs_skip( &ss, 8 * ( i_start + i_sequence_start ) - bs_pos( s ) );
- bs_skip( &ss, 32 ); /* Length */
- bs_skip( &ss, 8 );
- bs_skip( &ss, 8 ); /* ATC sequence count (MUST be 1 ?) */
- bs_skip( &ss, 32 ); /* ATC start (MUST be 0) */
- const int i_stc = bs_read( &ss, 8 );
- bs_skip( &ss, 8 ); /* STC ID offset (MUST be 0 ? */
- p_clpi->p_stc = calloc( i_stc, sizeof(*p_clpi->p_stc) );
- for( p_clpi->i_stc = 0; p_clpi->i_stc < i_stc; p_clpi->i_stc++ )
- {
- if( !p_clpi->p_stc )
- break;
- bd_clpi_stc_Parse( &p_clpi->p_stc[p_clpi->i_stc], &ss );
- }
- /* Program */
- bs_t ps = *s;
- bs_skip( &ps, 8 * ( i_start + i_program_start ) - bs_pos( s ) );
- bs_skip( &ps, 32 ); /* Length */
- bs_skip( &ps, 8 );
- bs_skip( &ps, 8 ); /* Program count (MUST be 1 ?) */
- bs_skip( &ps, 32 ); /* Program sequence start (MUST be 0) */
- p_clpi->i_pmt_pid = bs_read( &ps, 16 );
- const int i_stream = bs_read( &ps, 8 );
- bs_skip( &ps, 8 ); /* Group count (MUST be 1 ?) */
- p_clpi->p_stream = calloc( i_stream, sizeof(*p_clpi->p_stream) );
- for( p_clpi->i_stream = 0; p_clpi->i_stream < i_stream; p_clpi->i_stream++ )
- {
- if( !p_clpi->p_stream )
- break;
- bd_clpi_stream_Parse( &p_clpi->p_stream[p_clpi->i_stream], &ps );
- }
- /* Read CPI */
- bs_t cs = *s;
- bs_skip( &cs, 8 * ( i_start + i_cpi_start ) - bs_pos( s ) );
- const uint32_t i_cpi_length = bs_read( &cs, 32 );
- if( i_cpi_length > 0 )
- {
- bs_skip( &cs, 12 );
- bs_skip( &cs, 4 ); /* Type (MUST be 1) */
- /* EPMap */
- const int i_epmap_start = bs_pos( &cs ) / 8;
- bs_skip( &cs, 8 );
- const int i_ep_map = bs_read( &cs, 8 );
- p_clpi->p_ep_map = calloc( i_ep_map, sizeof(*p_clpi->p_ep_map) );
- for( p_clpi->i_ep_map = 0; p_clpi->i_ep_map < i_ep_map; p_clpi->i_ep_map++ )
- {
- if( !p_clpi->p_ep_map )
- break;
- if( bd_clpi_ep_map_Parse( &p_clpi->p_ep_map[p_clpi->i_ep_map],
- &cs, i_epmap_start ) )
- break;
- }
- }
- else
- {
- p_clpi->i_ep_map = 0;
- p_clpi->p_ep_map = NULL;
- }
- return VLC_SUCCESS;
- }