stream.c

VLC Player Source Code

        return VLC_EGENERIC;
    }

    /* Date the current track */
    p_sys->stream.tk[p_sys->stream.i_tk].i_date = mdate();

    /* Try to reuse already read data */
    for( i = 0; i < STREAM_CACHE_TRACK; i++ )
    {
        stream_track_t *tk = &p_sys->stream.tk[i];

        if( i_pos >= tk->i_start && i_pos <= tk->i_end )
        {
#ifdef STREAM_DEBUG
            msg_Dbg( s, "AStreamSeekStream: reusing %d start=%"PRId64
                     " end=%"PRId64, i, tk->i_start, tk->i_end );
#endif

            /* Seek at the end of the buffer */
            if( ASeek( s, tk->i_end ) ) return VLC_EGENERIC;

            /* That's it */
            p_sys->i_pos = i_pos;
            p_sys->stream.i_tk = i;
            p_sys->stream.i_offset = i_pos - tk->i_start;

            if( p_sys->stream.i_used < 1024 )
                p_sys->stream.i_used = 1024;

            if( AStreamRefillStream( s ) && i_pos == tk->i_end )
                return VLC_EGENERIC;

            return VLC_SUCCESS;
        }
    }

    access_Control( p_access, ACCESS_CAN_SEEK, &b_afastseek );
    /* FIXME compute seek cost (instead of static 'stupid' value) */
    i_maxth = __MIN( p_sys->stream.i_read_size, STREAM_READ_ATONCE / 2 );
    if( !b_afastseek )
        i_maxth *= 3;

    /* FIXME TODO */
#if 0
    /* Search closest segment TODO */
    for( i = 0; i < STREAM_CACHE_TRACK; i++ )
    {
        stream_track_t *tk = &p_sys->stream.tk[i];

        if( i_pos + i_maxth >= tk->i_start )
        {
            msg_Dbg( s, "good segment before current pos, TODO" );
        }
        if( i_pos - i_maxth <= tk->i_end )
        {
            msg_Dbg( s, "good segment after current pos, TODO" );
        }
    }
#endif

    /* Nothing good, seek and choose oldest segment */
    if( ASeek( s, i_pos ) ) return VLC_EGENERIC;
    p_sys->i_pos = i_pos;

    i_new = 0;
    for( i = 1; i < STREAM_CACHE_TRACK; i++ )
    {
        if( p_sys->stream.tk[i].i_date < p_sys->stream.tk[i_new].i_date )
            i_new = i;
    }

    /* Reset the segment */
    p_sys->stream.i_tk     = i_new;
    p_sys->stream.i_offset =  0;
    p_sys->stream.tk[i_new].i_start = i_pos;
    p_sys->stream.tk[i_new].i_end   = i_pos;

    /* Read data */
    if( p_sys->stream.i_used < STREAM_READ_ATONCE / 2 )
        p_sys->stream.i_used = STREAM_READ_ATONCE / 2;

    if( AStreamRefillStream( s ) )
        return VLC_EGENERIC;

    return VLC_SUCCESS;
}

static int AStreamRefillStream( stream_t *s )
{
    stream_sys_t *p_sys = s->p_sys;
    stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];

    /* We read but won't increase i_start after initial start + offset */
    int i_toread =
        __MIN( p_sys->stream.i_used, STREAM_CACHE_TRACK_SIZE -
               (tk->i_end - tk->i_start - p_sys->stream.i_offset) );
    bool b_read = false;
    int64_t i_start, i_stop;

    if( i_toread <= 0 ) return VLC_EGENERIC; /* EOF */

#ifdef STREAM_DEBUG
    msg_Dbg( s, "AStreamRefillStream: used=%d toread=%d",
                 p_sys->stream.i_used, i_toread );
#endif

    i_start = mdate();
    while( i_toread > 0 )
    {
        int i_off = tk->i_end % STREAM_CACHE_TRACK_SIZE;
        int i_read;

        if( s->b_die )
            return VLC_EGENERIC;

        i_read = __MIN( i_toread, STREAM_CACHE_TRACK_SIZE - i_off );
        i_read = AReadStream( s, &tk->p_buffer[i_off], i_read );

        /* msg_Dbg( s, "AStreamRefillStream: read=%d", i_read ); */
        if( i_read <  0 )
        {
            msleep( STREAM_DATA_WAIT );
            continue;
        }
        else if( i_read == 0 )
        {
            if( !b_read ) return VLC_EGENERIC;
            return VLC_SUCCESS;
        }
        b_read = true;

        /* Update end */
        tk->i_end += i_read;

        /* Windows of STREAM_CACHE_TRACK_SIZE */
        if( tk->i_end - tk->i_start > STREAM_CACHE_TRACK_SIZE )
        {
            int i_invalid = tk->i_end - tk->i_start - STREAM_CACHE_TRACK_SIZE;

            tk->i_start += i_invalid;
            p_sys->stream.i_offset -= i_invalid;
        }

        i_toread -= i_read;
        p_sys->stream.i_used -= i_read;

        p_sys->stat.i_bytes += i_read;
        p_sys->stat.i_read_count++;
    }
    i_stop = mdate();

    p_sys->stat.i_read_time += i_stop - i_start;

    return VLC_SUCCESS;
}

static void AStreamPrebufferStream( stream_t *s )
{
    stream_sys_t *p_sys = s->p_sys;
    access_t     *p_access = p_sys->p_access;

    int64_t i_first = 0;
    int64_t i_start;
    int64_t i_prebuffer = p_sys->b_quick ? STREAM_CACHE_TRACK_SIZE /100 :
        ( (p_access->info.i_title > 1 || p_access->info.i_seekpoint > 1) ?
          STREAM_CACHE_PREBUFFER_SIZE : STREAM_CACHE_TRACK_SIZE / 3 );

    msg_Dbg( s, "pre-buffering..." );
    i_start = mdate();
    for( ;; )
    {
        stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];

        int64_t i_date = mdate();
        int i_read;

        if( s->b_die || tk->i_end >= i_prebuffer ||
            (i_first > 0 && i_first + STREAM_CACHE_PREBUFFER_LENGTH < i_date) )
        {
            int64_t i_byterate;

            /* Update stat */
            p_sys->stat.i_bytes = tk->i_end - tk->i_start;
            p_sys->stat.i_read_time = i_date - i_start;
            i_byterate = ( INT64_C(1000000) * p_sys->stat.i_bytes ) /
                         (p_sys->stat.i_read_time+1);

            msg_Dbg( s, "pre-buffering done %"PRId64" bytes in %"PRId64"s - "
                     "%"PRId64" kbytes/s",
                     p_sys->stat.i_bytes,
                     p_sys->stat.i_read_time / INT64_C(1000000),
                     i_byterate / 1024 );
            break;
        }

        /* */
        i_read = STREAM_CACHE_TRACK_SIZE - tk->i_end;
        i_read = __MIN( p_sys->stream.i_read_size, i_read );
        i_read = AReadStream( s, &tk->p_buffer[tk->i_end], i_read );
        if( i_read <  0 )
        {
            msleep( STREAM_DATA_WAIT );
            continue;
        }
        else if( i_read == 0 )
        {
            /* EOF */
            break;
        }

        if( i_first == 0 )
        {
            i_first = mdate();
            msg_Dbg( s, "received first data for our buffer");
        }

        tk->i_end += i_read;

        p_sys->stat.i_read_count++;
    }
}

/****************************************************************************
 * Method 3:
 ****************************************************************************/

static int AStreamReadImmediate( stream_t *s, void *p_read, unsigned int i_read )
{
    stream_sys_t *p_sys = s->p_sys;

#ifdef STREAM_DEBUG
    msg_Dbg( s, "AStreamReadImmediate p_read=%p i_read=%d",
             p_read, i_read );
#endif

    /* First, check if we already have some data in the buffer,
     * that we could copy directly */
    int i_copy = __MIN( stream_buffered_size( s ), i_read );
    if( i_copy )
    {
#ifdef STREAM_DEBUG
        msg_Dbg( s, "AStreamReadImmediate: copy %d from %p", i_copy, stream_buffer( s ) );
#endif

        assert( i_copy <= STREAM_CACHE_SIZE );

        if( p_read )
        {
            memcpy( p_read, stream_buffer( s ), i_copy );
            p_read = (uint8_t *)p_read + i_copy;
        }
    }

    /* Now that we've read our buffer we don't need its i_copy bytes */
    stream_buffer_empty( s, i_copy );

    /* Now check if we have still to really read some data */
    int i_to_read = i_read - i_copy;
    if( i_to_read )
    {
        if( p_read )
            i_to_read = AReadStream( s, p_read, i_to_read );
        else
        {
            void * dummy = malloc(i_to_read);
            i_to_read = AReadStream( s, dummy, i_to_read );
            free(dummy);
        }
    }

    p_sys->i_pos += i_to_read;

    return i_to_read + i_copy;
}

static int AStreamPeekImmediate( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
{
#ifdef STREAM_DEBUG
    msg_Dbg( s, "AStreamPeekImmediate: %d  size=%"PRId64,
             i_read, size_buffered_size( s ) );
#endif

    /* Avoid problem, but that shouldn't happen */
    if( i_read > STREAM_CACHE_SIZE / 2 )
        i_read = STREAM_CACHE_SIZE / 2;

    int i_to_read = i_read - stream_buffered_size( s );
    if( i_to_read > 0 )
    {
#ifdef STREAM_DEBUG
        msg_Dbg( s, "AStreamPeekImmediate: Reading %d",
             i_to_read );
#endif
        i_to_read = AReadStream( s, stream_buffer( s ) + stream_buffered_size( s ),
                                 i_to_read );

        if( i_to_read > 0 )
            stream_buffer_fill( s, i_to_read );
    }

    *pp_peek = stream_buffer( s );

    return __MIN(stream_buffered_size( s ), i_read);
}

static int AStreamSeekImmediate( stream_t *s, int64_t i_pos )
{
    stream_sys_t *p_sys = s->p_sys;
    access_t     *p_access = p_sys->p_access;
    bool   b_aseek;

#ifdef STREAM_DEBUG
    msg_Dbg( s, "AStreamSeekImmediate to %"PRId64" pos=%"PRId64
             i_pos, p_sys->i_pos );
#endif

    access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
    if( !b_aseek )
    {
        /* We can't do nothing */
        msg_Dbg( s, "AStreamSeekImmediate: can't seek" );
        return VLC_EGENERIC;
    }

    /* Just reset our buffer */
    stream_buffer_empty( s, stream_buffered_size( s ) );

    if( ASeek( s, i_pos ) ) return VLC_EGENERIC;

    return VLC_SUCCESS;
}

/****************************************************************************
 * stream_ReadLine:
 ****************************************************************************/
/**
 * Read from the stream untill first newline.
 * \param s Stream handle to read from
 * \return A pointer to the allocated output string. You need to free this when you are done.
 */
#define STREAM_PROBE_LINE 2048
#define STREAM_LINE_MAX (2048*100)
char * stream_ReadLine( stream_t *s )
{
    char *p_line = NULL;
    int i_line = 0, i_read = 0;

    while( i_read < STREAM_LINE_MAX )
    {
        char *psz_eol;
        const uint8_t *p_data;
        int i_data;
        int64_t i_pos;

        /* Probe new data */
        i_data = stream_Peek( s, &p_data, STREAM_PROBE_LINE );
        if( i_data <= 0 ) break; /* No more data */

        /* BOM detection */
        i_pos = stream_Tell( s );
        if( i_pos == 0 && i_data > 4 )
        {
            int i_bom_size = 0;
            char *psz_encoding = NULL;

            if( p_data[0] == 0xEF && p_data[1] == 0xBB && p_data[2] == 0xBF )
            {
                psz_encoding = strdup( "UTF-8" );
                i_bom_size = 3;
            }
            else if( p_data[0] == 0x00 && p_data[1] == 0x00 )
            {
                if( p_data[2] == 0xFE && p_data[3] == 0xFF )
                {
                    psz_encoding = strdup( "UTF-32BE" );
                    s->i_char_width = 4;
                    i_bom_size = 4;
                }
            }
            else if( p_data[0] == 0xFF && p_data[1] == 0xFE )
            {
                if( p_data[2] == 0x00 && p_data[3] == 0x00 )
                {
                    psz_encoding = strdup( "UTF-32LE" );
                    s->i_char_width = 4;
                    s->b_little_endian = true;
                    i_bom_size = 4;
                }
                else
                {
                    psz_encoding = strdup( "UTF-16LE" );
                    s->b_little_endian = true;
                    s->i_char_width = 2;
                    i_bom_size = 2;
                }
            }
            else if( p_data[0] == 0xFE && p_data[1] == 0xFF )
            {
                psz_encoding = strdup( "UTF-16BE" );
                s->i_char_width = 2;
                i_bom_size = 2;
            }

            /* Seek past the BOM */
            if( i_bom_size )
            {
                stream_Seek( s, i_bom_size );
                p_data += i_bom_size;
                i_data -= i_bom_size;
            }

            /* Open the converter if we need it */
            if( psz_encoding != NULL )
            {
                input_thread_t *p_input;
                msg_Dbg( s, "%s BOM detected", psz_encoding );
                p_input = (input_thread_t *)vlc_object_find( s, VLC_OBJECT_INPUT, FIND_PARENT );
                if( s->i_char_width > 1 )
                {
                    s->conv = vlc_iconv_open( "UTF-8", psz_encoding );
                    if( s->conv == (vlc_iconv_t)-1 )
                    {
                        msg_Err( s, "iconv_open failed" );
                    }
                }
                if( p_input != NULL)
                {
                    var_Create( p_input, "subsdec-encoding", VLC_VAR_STRING | VLC_VAR_DOINHERIT );