mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-19 00:01:23 +00:00
125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/* 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);
|
|
|
|
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;
|
|
}
|