subtitle.c

video linux conference

    demux_t *p_demux = (demux_t*)p_this;
    demux_sys_t *p_sys = p_demux->p_sys;
    int i;

    for( i = 0; i < p_sys->i_subtitles; i++ )
    {
        if( p_sys->subtitle[i].psz_text )
            free( p_sys->subtitle[i].psz_text );
    }
    if( p_sys->subtitle )
        free( p_sys->subtitle );

    free( p_sys );
}

/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( demux_t *p_demux, int i_query, va_list args )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    int64_t *pi64, i64;
    double *pf, f;

    switch( i_query )
    {
        case DEMUX_GET_LENGTH:
            pi64 = (int64_t*)va_arg( args, int64_t * );
            *pi64 = p_sys->i_length;
            return VLC_SUCCESS;

        case DEMUX_GET_TIME:
            pi64 = (int64_t*)va_arg( args, int64_t * );
            if( p_sys->i_subtitle < p_sys->i_subtitles )
            {
                *pi64 = p_sys->subtitle[p_sys->i_subtitle].i_start;
                return VLC_SUCCESS;
            }
            return VLC_EGENERIC;

        case DEMUX_SET_TIME:
            i64 = (int64_t)va_arg( args, int64_t );
            p_sys->i_subtitle = 0;
            while( p_sys->i_subtitle < p_sys->i_subtitles &&
                   p_sys->subtitle[p_sys->i_subtitle].i_start < i64 )
            {
                p_sys->i_subtitle++;
            }

            if( p_sys->i_subtitle >= p_sys->i_subtitles )
                return VLC_EGENERIC;
            return VLC_SUCCESS;

        case DEMUX_GET_POSITION:
            pf = (double*)va_arg( args, double * );
            if( p_sys->i_subtitle >= p_sys->i_subtitles )
            {
                *pf = 1.0;
            }
            else if( p_sys->i_subtitles > 0 )
            {
                *pf = (double)p_sys->subtitle[p_sys->i_subtitle].i_start /
                      (double)p_sys->i_length;
            }
            else
            {
                *pf = 0.0;
            }
            return VLC_SUCCESS;

        case DEMUX_SET_POSITION:
            f = (double)va_arg( args, double );
            i64 = f * p_sys->i_length;

            p_sys->i_subtitle = 0;
            while( p_sys->i_subtitle < p_sys->i_subtitles &&
                   p_sys->subtitle[p_sys->i_subtitle].i_start < i64 )
            {
                p_sys->i_subtitle++;
            }
            if( p_sys->i_subtitle >= p_sys->i_subtitles )
                return VLC_EGENERIC;
            return VLC_SUCCESS;

        case DEMUX_SET_NEXT_DEMUX_TIME:
            p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
            return VLC_SUCCESS;

        case DEMUX_GET_FPS:
        case DEMUX_GET_META:
        case DEMUX_GET_TITLE_INFO:
            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;

    if( p_sys->i_subtitle >= p_sys->i_subtitles )
        return 0;

    i_maxdate = p_sys->i_next_demux_date - var_GetTime( p_demux->p_parent, "spu-delay" );;
    if( i_maxdate <= 0 && p_sys->i_subtitle < p_sys->i_subtitles )
    {
        /* Should not happen */
        i_maxdate = p_sys->subtitle[p_sys->i_subtitle].i_start + 1;
    }

    while( p_sys->i_subtitle < p_sys->i_subtitles &&
           p_sys->subtitle[p_sys->i_subtitle].i_start < i_maxdate )
    {
        block_t *p_block;
        int i_len = strlen( p_sys->subtitle[p_sys->i_subtitle].psz_text ) + 1;

        if( i_len <= 1 )
        {
            /* empty subtitle */
            p_sys->i_subtitle++;
            continue;
        }

        if( ( p_block = block_New( p_demux, i_len ) ) == NULL )
        {
            p_sys->i_subtitle++;
            continue;
        }

        if( p_sys->subtitle[p_sys->i_subtitle].i_start < 0 )
        {
            p_sys->i_subtitle++;
            continue;
        }

        p_block->i_pts = p_sys->subtitle[p_sys->i_subtitle].i_start;
        p_block->i_dts = p_block->i_pts;
        if( p_sys->subtitle[p_sys->i_subtitle].i_stop > 0 )
        {
            p_block->i_length =
                p_sys->subtitle[p_sys->i_subtitle].i_stop - p_block->i_pts;
        }

        memcpy( p_block->p_buffer,
                p_sys->subtitle[p_sys->i_subtitle].psz_text, i_len );
        if( p_block->i_pts > 0 )
        {
            es_out_Send( p_demux->out, p_sys->es, p_block );
        }
        else
        {
            block_Release( p_block );
        }
        p_sys->i_subtitle++;
    }

    /* */
    p_sys->i_next_demux_date = 0;

    return 1;
}

/*****************************************************************************
 * Fix: fix time stamp and order of subtitle
 *****************************************************************************/
static void Fix( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    vlc_bool_t b_done;
    int     i_index;

    /* *** fix order (to be sure...) *** */
    /* We suppose that there are near in order and this durty bubble sort
     * wont take too much time
     */
    do
    {
        b_done = VLC_TRUE;
        for( i_index = 1; i_index < p_sys->i_subtitles; i_index++ )
        {
            if( p_sys->subtitle[i_index].i_start <
                    p_sys->subtitle[i_index - 1].i_start )
            {
                subtitle_t sub_xch;
                memcpy( &sub_xch,
                        p_sys->subtitle + i_index - 1,
                        sizeof( subtitle_t ) );
                memcpy( p_sys->subtitle + i_index - 1,
                        p_sys->subtitle + i_index,
                        sizeof( subtitle_t ) );
                memcpy( p_sys->subtitle + i_index,
                        &sub_xch,
                        sizeof( subtitle_t ) );
                b_done = VLC_FALSE;
            }
        }
    } while( !b_done );
}

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 void TextPreviousLine( text_t *txt )
{
    if( txt->i_line > 0 )
        txt->i_line--;
}

/*****************************************************************************
 * Specific Subtitle function
 *****************************************************************************/
#define MAX_LINE 8192
static int ParseMicroDvd( demux_t *p_demux, subtitle_t *p_subtitle )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    text_t      *txt = &p_sys->txt;
    /*
     * each line:
     *  {n1}{n2}Line1|Line2|Line3....
     * where n1 and n2 are the video frame number...
     * {n2} can also be {}
     */
    char *s;

    char buffer_text[MAX_LINE + 1];
    int    i_start;
    int    i_stop;
    unsigned int i;

    int i_microsecperframe = 40000; /* default to 25 fps */
    if( p_sys->i_microsecperframe > 0 ) 
        i_microsecperframe = p_sys->i_microsecperframe;
    
    p_subtitle->i_start = 0;
    p_subtitle->i_stop  = 0;
    p_subtitle->psz_text = NULL;

    for( ;; )
    {
        if( ( s = TextGetLine( txt ) ) == NULL )
        {
            return( VLC_EGENERIC );
        }
        i_start = 0;
        i_stop  = 0;

        memset( buffer_text, '\0', MAX_LINE );
        if( sscanf( s, "{%d}{}%[^\r\n]", &i_start, buffer_text ) == 2 ||
            sscanf( s, "{%d}{%d}%[^\r\n]", &i_start, &i_stop, buffer_text ) == 3)
        {
            break;
        }
    }
    /* replace | by \n */
    for( i = 0; i < strlen( buffer_text ); i++ )
    {
        if( buffer_text[i] == '|' )
        {
            buffer_text[i] = '\n';
        }
    }

    p_subtitle->i_start = (int64_t)i_start * i_microsecperframe;
    p_subtitle->i_stop  = (int64_t)i_stop  * i_microsecperframe;
    p_subtitle->psz_text = strndup( buffer_text, MAX_LINE );
    return( 0 );
}

static int  ParseSubRip( demux_t *p_demux, subtitle_t *p_subtitle )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    text_t      *txt = &p_sys->txt;

    /*
     * n
     * h1:m1:s1,d1 --> h2:m2:s2,d2
     * Line1
     * Line2
     * ...
     * [empty line]
     *
     */
    char *s;
    char buffer_text[ 10 * MAX_LINE];
    int  i_buffer_text;
    int64_t     i_start;
    int64_t     i_stop;

    p_subtitle->i_start = 0;
    p_subtitle->i_stop  = 0;
    p_subtitle->psz_text = NULL;

    for( ;; )
    {
        int h1, m1, s1, d1, h2, m2, s2, d2;
        if( ( s = TextGetLine( txt ) ) == NULL )
        {
            return( VLC_EGENERIC );
        }
        if( sscanf( s,
                    "%d:%d:%d,%d --> %d:%d:%d,%d",
                    &h1, &m1, &s1, &d1,
                    &h2, &m2, &s2, &d2 ) == 8 )
        {
            i_start = ( (int64_t)h1 * 3600*1000 +
                        (int64_t)m1 * 60*1000 +
                        (int64_t)s1 * 1000 +
                        (int64_t)d1 ) * 1000;

            i_stop  = ( (int64_t)h2 * 3600*1000 +
                        (int64_t)m2 * 60*1000 +
                        (int64_t)s2 * 1000 +
                        (int64_t)d2 ) * 1000;

            /* Now read text until an empty line */
            for( i_buffer_text = 0;; )
            {
                int i_len;
                if( ( s = TextGetLine( txt ) ) == NULL )
                {
                    return( VLC_EGENERIC );
                }

                i_len = strlen( s );
                if( i_len <= 0 )
                {
                    /* empty line -> end of this subtitle */
                    buffer_text[__MAX( i_buffer_text - 1, 0 )] = '\0';
                    p_subtitle->i_start = i_start;
                    p_subtitle->i_stop = i_stop;
                    p_subtitle->psz_text = strdup( buffer_text );
                    /* If framerate is available, use sub-fps */
                    if( p_sys->i_microsecperframe != 0 &&
                        p_sys->i_original_mspf != 0)
                    {
                        p_subtitle->i_start = (int64_t)i_start *
                                              p_sys->i_microsecperframe/
                                              p_sys->i_original_mspf;
                        p_subtitle->i_stop  = (int64_t)i_stop  *
                                              p_sys->i_microsecperframe /
                                              p_sys->i_original_mspf;
                    }