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/* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, 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) {
g_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);
rid->position -= 1;
if (rid->position < 0)
rid->position = 0;
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 ()
{
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;
}
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