Function declpcmWork

libhb/declpcm.c:199–240

* Convert DVD encapsulated LPCM to floating point PCM audio buffers. * The amount of audio in a PCM frame is always <= the amount that will fit * in a DVD block (2048 bytes) but the standard doesn't require that the audio * frames line up with the DVD frames. Since audio frame boundaries are unrelated * to DVD PES boundaries, this routine has to reconstruct then extract the audio * frames. Be

 * frames. Because of the arbitrary alignment, it can output zero, one or two buf's.
 */
static int declpcmWork( 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 *in = *buf_in;
    hb_buffer_t *buf = NULL;
    hb_buffer_list_t list;

    hb_buffer_list_clear(&list);
    if (in->s.flags & HB_BUF_FLAG_EOF)
    {
        /* EOF on input stream - send it downstream & say that we're done */
        *buf_out = in;
        *buf_in = NULL;
        return HB_WORK_DONE;
    }

    // if we have a frame to finish, add enough data from this buf
    // to finish it
    if (pv->size)
    {
        memcpy(pv->frame + pv->pos, in->data + 6, pv->size - pv->pos);
        buf = Decode( w );
        hb_buffer_list_append(&list, buf);
    }

    /* save the (rest of) data from this buf in our frame buffer */
    lpcmInfo( w, in );
    int off = pv->offset;
    int amt = in->size - off;
    pv->pos = amt;
    memcpy( pv->frame, in->data + off, amt );
    if (amt >= pv->size)
    {
        buf = Decode( w );
        hb_buffer_list_append(&list, buf);
        pv->size = 0;
    }

    *buf_out = hb_buffer_list_clear(&list);
    return HB_WORK_OK;
}

static hb_buffer_t *Decode( hb_work_object_t *w )
{