Branch data Line data Source code
1 : : /* GStreamer Wavpack plugin
2 : : * Copyright (c) 2006 Sebastian Dröge <slomo@circular-chaos.org>
3 : : *
4 : : * gstwavpackstreamreader.c: stream reader used for decoding
5 : : *
6 : : * This library is free software; you can redistribute it and/or
7 : : * modify it under the terms of the GNU Library General Public
8 : : * License as published by the Free Software Foundation; either
9 : : * version 2 of the License, or (at your option) any later version.
10 : : *
11 : : * This library is distributed in the hope that it will be useful,
12 : : * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 : : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 : : * Library General Public License for more details.
15 : : *
16 : : * You should have received a copy of the GNU Library General Public
17 : : * License along with this library; if not, write to the
18 : : * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 : : * Boston, MA 02111-1307, USA.
20 : : */
21 : :
22 : : #include <string.h>
23 : : #include <math.h>
24 : : #include <gst/gst.h>
25 : :
26 : : #include "gstwavpackstreamreader.h"
27 : :
28 : : GST_DEBUG_CATEGORY_EXTERN (wavpack_debug);
29 : : #define GST_CAT_DEFAULT wavpack_debug
30 : :
31 : : static int32_t
32 : 106 : gst_wavpack_stream_reader_read_bytes (void *id, void *data, int32_t bcount)
33 : : {
34 : 106 : read_id *rid = (read_id *) id;
35 : 106 : uint32_t left = rid->length - rid->position;
36 : 106 : uint32_t to_read = MIN (left, bcount);
37 : :
38 [ - + ]: 106 : GST_DEBUG ("Trying to read %d of %d bytes from position %d", bcount,
39 : : rid->length, rid->position);
40 : :
41 [ + - ]: 106 : if (to_read > 0) {
42 : 106 : g_memmove (data, rid->buffer + rid->position, to_read);
43 : 106 : rid->position += to_read;
44 : 106 : return to_read;
45 : : } else {
46 [ # # ]: 0 : GST_WARNING ("Couldn't read %d bytes", bcount);
47 : 106 : return 0;
48 : : }
49 : : }
50 : :
51 : : static uint32_t
52 : 51 : gst_wavpack_stream_reader_get_pos (void *id)
53 : : {
54 [ - + ]: 51 : GST_DEBUG ("Returning position %d", ((read_id *) id)->position);
55 : 51 : return ((read_id *) id)->position;
56 : : }
57 : :
58 : : static int
59 : 0 : gst_wavpack_stream_reader_set_pos_abs (void *id, uint32_t pos)
60 : : {
61 [ # # ]: 0 : GST_WARNING ("Should not be called: tried to set absolute position to %d",
62 : : pos);
63 : 0 : return -1;
64 : : }
65 : :
66 : : static int
67 : 0 : gst_wavpack_stream_reader_set_pos_rel (void *id, int32_t delta, int mode)
68 : : {
69 [ # # ]: 0 : GST_WARNING ("Should not be called: tried to set relative position to %d"
70 : : " with mode %d", delta, mode);
71 : 0 : return -1;
72 : : }
73 : :
74 : : static int
75 : 4 : gst_wavpack_stream_reader_push_back_byte (void *id, int c)
76 : : {
77 : 4 : read_id *rid = (read_id *) id;
78 : :
79 [ - + ]: 4 : GST_DEBUG ("Pushing back one byte: 0x%x", c);
80 : :
81 : 4 : rid->position -= 1;
82 : : if (rid->position < 0)
83 : : rid->position = 0;
84 : 4 : return rid->position;
85 : : }
86 : :
87 : : static uint32_t
88 : 4 : gst_wavpack_stream_reader_get_length (void *id)
89 : : {
90 [ - + ]: 4 : GST_DEBUG ("Returning length %d", ((read_id *) id)->length);
91 : :
92 : 4 : return ((read_id *) id)->length;
93 : : }
94 : :
95 : : static int
96 : 1 : gst_wavpack_stream_reader_can_seek (void *id)
97 : : {
98 [ - + ]: 1 : GST_DEBUG ("Can't seek");
99 : 1 : return FALSE;
100 : : }
101 : :
102 : : static int32_t
103 : 0 : gst_wavpack_stream_reader_write_bytes (void *id, void *data, int32_t bcount)
104 : : {
105 [ # # ]: 0 : GST_WARNING ("Should not be called, tried to write %d bytes", bcount);
106 : 0 : return 0;
107 : : }
108 : :
109 : : WavpackStreamReader *
110 : 9 : gst_wavpack_stream_reader_new (void)
111 : : {
112 : 9 : WavpackStreamReader *stream_reader =
113 : : (WavpackStreamReader *) g_malloc0 (sizeof (WavpackStreamReader));
114 : 9 : stream_reader->read_bytes = gst_wavpack_stream_reader_read_bytes;
115 : 9 : stream_reader->get_pos = gst_wavpack_stream_reader_get_pos;
116 : 9 : stream_reader->set_pos_abs = gst_wavpack_stream_reader_set_pos_abs;
117 : 9 : stream_reader->set_pos_rel = gst_wavpack_stream_reader_set_pos_rel;
118 : 9 : stream_reader->push_back_byte = gst_wavpack_stream_reader_push_back_byte;
119 : 9 : stream_reader->get_length = gst_wavpack_stream_reader_get_length;
120 : 9 : stream_reader->can_seek = gst_wavpack_stream_reader_can_seek;
121 : 9 : stream_reader->write_bytes = gst_wavpack_stream_reader_write_bytes;
122 : :
123 : 9 : return stream_reader;
124 : : }
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