/* GStreamer Wavpack plugin

 * Copyright (c) 2006 Sebastian Dröge <slomo@circular-chaos.org>

 *

 * gstwavpackstreamreader.c: stream reader used for decoding

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library 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

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public

 * License along with this library; if not, write to the

 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 */

#include <string.h>

#include <math.h>

#include <gst/gst.h>

#include "gstwavpackstreamreader.h"

GST_DEBUG_CATEGORY_EXTERN (wavpack_debug);

#define GST_CAT_DEFAULT wavpack_debug

static int32_t

gst_wavpack_stream_reader_read_bytes (void *id, void *data, int32_t bcount)

{

  read_id *rid = (read_id *) id;

  uint32_t left = rid->length - rid->position;

  uint32_t to_read = MIN (left, bcount);

  GST_DEBUG ("Trying to read %d of %d bytes from position %d", bcount,

      rid->length, rid->position);

  if (to_read > 0) {

    memmove (data, rid->buffer + rid->position, to_read);

    rid->position += to_read;

    return to_read;

  } else {

    GST_WARNING ("Couldn't read %d bytes", bcount);

    return 0;

  }

}

static uint32_t

gst_wavpack_stream_reader_get_pos (void *id)

{

  GST_DEBUG ("Returning position %d", ((read_id *) id)->position);

  return ((read_id *) id)->position;

}

static int

gst_wavpack_stream_reader_set_pos_abs (void *id, uint32_t pos)

{

  GST_WARNING ("Should not be called: tried to set absolute position to %d",

      pos);

  return -1;

}

static int

gst_wavpack_stream_reader_set_pos_rel (void *id, int32_t delta, int mode)

{

  GST_WARNING ("Should not be called: tried to set relative position to %d"

      " with mode %d", delta, mode);

  return -1;

}

static int

gst_wavpack_stream_reader_push_back_byte (void *id, int c)

{

  read_id *rid = (read_id *) id;

  GST_DEBUG ("Pushing back one byte: 0x%x", c);

  if (rid->position == 0)

    return rid->position;

  rid->position -= 1;

  return rid->position;

}

static uint32_t

gst_wavpack_stream_reader_get_length (void *id)

{

  GST_DEBUG ("Returning length %d", ((read_id *) id)->length);

  return ((read_id *) id)->length;

}

static int

gst_wavpack_stream_reader_can_seek (void *id)

{

  GST_DEBUG ("Can't seek");

  return FALSE;

}

static int32_t

gst_wavpack_stream_reader_write_bytes (void *id, void *data, int32_t bcount)

{

  GST_WARNING ("Should not be called, tried to write %d bytes", bcount);

  return 0;

}

WavpackStreamReader *

gst_wavpack_stream_reader_new (void)

{

  WavpackStreamReader *stream_reader =

      (WavpackStreamReader *) g_malloc0 (sizeof (WavpackStreamReader));

  stream_reader->read_bytes = gst_wavpack_stream_reader_read_bytes;

  stream_reader->get_pos = gst_wavpack_stream_reader_get_pos;

  stream_reader->set_pos_abs = gst_wavpack_stream_reader_set_pos_abs;

  stream_reader->set_pos_rel = gst_wavpack_stream_reader_set_pos_rel;

  stream_reader->push_back_byte = gst_wavpack_stream_reader_push_back_byte;

  stream_reader->get_length = gst_wavpack_stream_reader_get_length;

  stream_reader->can_seek = gst_wavpack_stream_reader_can_seek;

  stream_reader->write_bytes = gst_wavpack_stream_reader_write_bytes;

  return stream_reader;

}