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124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
/* GStreamer Wavpack plugin
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* Copyright (c) 2006 Sebastian Dröge <slomo@circular-chaos.org>
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*
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* gstwavpackstreamreader.c: stream reader used for decoding
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <string.h>
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#include <math.h>
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#include <gst/gst.h>
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#include "gstwavpackstreamreader.h"
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GST_DEBUG_CATEGORY_EXTERN (wavpack_debug);
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#define GST_CAT_DEFAULT wavpack_debug
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static int32_t
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gst_wavpack_stream_reader_read_bytes (void *id, void *data, int32_t bcount)
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{
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read_id *rid = (read_id *) id;
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uint32_t left = rid->length - rid->position;
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uint32_t to_read = MIN (left, bcount);
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GST_DEBUG ("Trying to read %d of %d bytes from position %d", bcount,
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rid->length, rid->position);
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if (to_read > 0) {
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g_memmove (data, rid->buffer + rid->position, to_read);
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rid->position += to_read;
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return to_read;
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} else {
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GST_WARNING ("Couldn't read %d bytes", bcount);
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return 0;
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}
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}
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static uint32_t
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gst_wavpack_stream_reader_get_pos (void *id)
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{
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GST_DEBUG ("Returning position %d", ((read_id *) id)->position);
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return ((read_id *) id)->position;
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}
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static int
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gst_wavpack_stream_reader_set_pos_abs (void *id, uint32_t pos)
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{
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GST_WARNING ("Should not be called: tried to set absolute position to %d",
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pos);
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return -1;
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}
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static int
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gst_wavpack_stream_reader_set_pos_rel (void *id, int32_t delta, int mode)
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{
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GST_WARNING ("Should not be called: tried to set relative position to %d"
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" with mode %d", delta, mode);
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return -1;
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}
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static int
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gst_wavpack_stream_reader_push_back_byte (void *id, int c)
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{
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read_id *rid = (read_id *) id;
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GST_DEBUG ("Pushing back one byte: 0x%x", c);
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rid->position -= 1;
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if (rid->position < 0)
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rid->position = 0;
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return rid->position;
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}
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static uint32_t
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gst_wavpack_stream_reader_get_length (void *id)
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{
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GST_DEBUG ("Returning length %d", ((read_id *) id)->length);
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return ((read_id *) id)->length;
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}
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static int
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gst_wavpack_stream_reader_can_seek (void *id)
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{
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GST_DEBUG ("Can't seek");
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return FALSE;
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}
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static int32_t
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gst_wavpack_stream_reader_write_bytes (void *id, void *data, int32_t bcount)
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{
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GST_WARNING ("Should not be called, tried to write %d bytes", bcount);
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return 0;
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}
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WavpackStreamReader *
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gst_wavpack_stream_reader_new (void)
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{
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WavpackStreamReader *stream_reader =
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(WavpackStreamReader *) g_malloc0 (sizeof (WavpackStreamReader));
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stream_reader->read_bytes = gst_wavpack_stream_reader_read_bytes;
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stream_reader->get_pos = gst_wavpack_stream_reader_get_pos;
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stream_reader->set_pos_abs = gst_wavpack_stream_reader_set_pos_abs;
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stream_reader->set_pos_rel = gst_wavpack_stream_reader_set_pos_rel;
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stream_reader->push_back_byte = gst_wavpack_stream_reader_push_back_byte;
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stream_reader->get_length = gst_wavpack_stream_reader_get_length;
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stream_reader->can_seek = gst_wavpack_stream_reader_can_seek;
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stream_reader->write_bytes = gst_wavpack_stream_reader_write_bytes;
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return stream_reader;
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}
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