vobsub.c

来自「video linux conference」· C语言 代码 · 共 619 行 · 第 1/2 页

            return VLC_EGENERIC;

        default:
            msg_Err( p_demux, "unknown query in subtitle control" );
            return VLC_EGENERIC;
    }
}

/*****************************************************************************
 * Demux: Send subtitle to decoder
 *****************************************************************************/
static int Demux( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    int64_t i_maxdate;
    int i;

    for( i = 0; i < p_sys->i_tracks; i++ )
    {
#define tk p_sys->track[i]
        if( tk.i_current_subtitle >= tk.i_subtitles )
            continue;

        i_maxdate = (int64_t) p_sys->i_next_demux_date;
        if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
        {
            /* Should not happen */
            i_maxdate = (int64_t) tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
        }

        while( tk.i_current_subtitle < tk.i_subtitles &&
               tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
        {
            int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
            block_t *p_block;
            int i_size = 0;

            /* first compute SPU size */
            if( tk.i_current_subtitle + 1 < tk.i_subtitles )
            {
                i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
            }
            if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */

            /* Seek at the right place */
            if( fseek( p_sys->p_vobsub_file, i_pos, SEEK_SET ) )
            {
                msg_Warn( p_demux,
                          "cannot seek at right vobsub location %d", i_pos );
                tk.i_current_subtitle++;
                continue;
            }

            /* allocate a packet */
            if( ( p_block = block_New( p_demux, i_size ) ) == NULL )
            {
                tk.i_current_subtitle++;
                continue;
            }

            /* read data */
            p_block->i_buffer = fread( p_block->p_buffer, 1, i_size,
                                       p_sys->p_vobsub_file );
            if( p_block->i_buffer <= 6 )
            {
                block_Release( p_block );
                tk.i_current_subtitle++;
                continue;
            }

            /* pts */
            p_block->i_pts = tk.p_subtitles[tk.i_current_subtitle].i_start;

            /* demux this block */
            DemuxVobSub( p_demux, p_block );

            tk.i_current_subtitle++;
        }
#undef tk
    }

    /* */
    p_sys->i_next_demux_date = 0;

    return 1;
}

static int TextLoad( text_t *txt, stream_t *s )
{
    int   i_line_max;

    /* init txt */
    i_line_max          = 500;
    txt->i_line_count   = 0;
    txt->i_line         = 0;
    txt->line           = calloc( i_line_max, sizeof( char * ) );

    /* load the complete file */
    for( ;; )
    {
        char *psz = stream_ReadLine( s );

        if( psz == NULL )
            break;

        txt->line[txt->i_line_count++] = psz;
        if( txt->i_line_count >= i_line_max )
        {
            i_line_max += 100;
            txt->line = realloc( txt->line, i_line_max * sizeof( char*) );
        }
    }

    if( txt->i_line_count <= 0 )
    {
        free( txt->line );
        return VLC_EGENERIC;
    }

    return VLC_SUCCESS;
}
static void TextUnload( text_t *txt )
{
    int i;

    for( i = 0; i < txt->i_line_count; i++ )
    {
        free( txt->line[i] );
    }
    free( txt->line );
    txt->i_line       = 0;
    txt->i_line_count = 0;
}

static char *TextGetLine( text_t *txt )
{
    if( txt->i_line >= txt->i_line_count )
        return( NULL );

    return txt->line[txt->i_line++];
}

static int ParseVobSubIDX( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    text_t      *txt = &p_sys->txt;
    char        *line;
    vobsub_track_t *current_tk;

    for( ;; )
    {
        if( ( line = TextGetLine( txt ) ) == NULL )
        {
            return( VLC_EGENERIC );
        }
        
        if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' ) 
            continue;
        else if( !strncmp( "size:", line, 5 ) )
        {
            /* Store the original size of the video */
            if( sscanf( line, "size: %dx%d",
                        &p_sys->i_original_frame_width, &p_sys->i_original_frame_height ) == 2 )
            {
                msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
            }
            else
            {
                msg_Warn( p_demux, "reading original frame size failed" );
            }
        }
        else if( !strncmp( "id:", line, 3 ) )
        {
            char language[20];
            int i_track_id;
            es_format_t fmt;

            /* Lets start a new track */
            if( sscanf( line, "id: %2s, index: %d",
                        language, &i_track_id ) == 2 )
            {
                p_sys->i_tracks++;
                p_sys->track = (vobsub_track_t*)realloc( p_sys->track, sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );

                /* Init the track */
                current_tk = &p_sys->track[p_sys->i_tracks - 1];
                memset( current_tk, 0, sizeof( vobsub_track_t ) );
                current_tk->i_current_subtitle = 0;
                current_tk->i_subtitles = 0;
                current_tk->p_subtitles = (subtitle_t*)malloc( sizeof( subtitle_t ) );;
                current_tk->i_track_id = i_track_id;

                es_format_Init( &fmt, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
                fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
                fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
                fmt.psz_language = strdup( language );
                current_tk->p_es = es_out_Add( p_demux->out, &fmt );

                msg_Dbg( p_demux, "new vobsub track detected" );
            }
            else
            {
                msg_Warn( p_demux, "reading new track failed" );
            }
        }
        else if( !strncmp( line, "timestamp:", 10 ) )
        {
            /*
             * timestamp: hh:mm:ss:mss, filepos: loc
             * loc is the hex location of the spu in the .sub file
             *
             */
            int h, m, s, ms, loc;
            int64_t i_start, i_location = 0;
            
            vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];

            if( sscanf( line, "timestamp: %d:%d:%d:%d, filepos: %x",
                        &h, &m, &s, &ms, &loc ) == 5 )
            {
                subtitle_t *current_sub;
                
                i_start = (int64_t) ( h * 3600*1000 +
                            m * 60*1000 +
                            s * 1000 +
                            ms ) * 1000;
                i_location = loc;
                
                current_tk->i_subtitles++;
                current_tk->p_subtitles = (subtitle_t*)realloc( current_tk->p_subtitles, sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
                current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
                
                current_sub->i_start = (int64_t) i_start;
                current_sub->i_vobsub_location = i_location;
            }
        }
    }
    return( 0 );
}

static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    uint8_t     *p = p_bk->p_buffer;
    uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
    int i;

    while( p < p_end )
    {
        int i_size = ps_pkt_size( p, p_end - p );
        block_t *p_pkt;
        int      i_id;
        int      i_spu;

        if( i_size <= 0 )
        {
            break;
        }
        if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
        {
            msg_Warn( p_demux, "invalid PES" );
            break;
        }

        if( p[3] != 0xbd )
        {
            /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
            p += i_size;
            continue;
        }

        /* Create a block */
        p_pkt = block_New( p_demux, i_size );
        memcpy( p_pkt->p_buffer, p, i_size);
        p += i_size;

        i_id = ps_pkt_id( p_pkt );
        if( (i_id&0xffe0) != 0xbd20 ||
            ps_pkt_parse_pes( p_pkt, 1 ) )
        {
            block_Release( p_pkt );
            continue;
        }
        i_spu = i_id&0x1f;
        /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */

        for( i = 0; i < p_sys->i_tracks; i++ )
        {
#define tk p_sys->track[i]
            p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
            p_pkt->i_length = 0;
            
            if( tk.p_es && tk.i_track_id == i_spu )
            {
                es_out_Send( p_demux->out, tk.p_es, p_pkt );
                p_bk->i_pts = 0;     /*only first packet has a pts */
                break;
            }
            else if( i == p_sys->i_tracks - 1 )
            {
                block_Release( p_pkt );
            }
#undef tk
        }
    }

    return VLC_SUCCESS;
}