1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
13 * express or implied.
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
17 */
18 /*********************************************************************************/
19 /* ------------------------------------------------------------------- */
20 /* MPEG-4 Util: AudioHintSample */
21 /* ------------------------------------------------------------------- */
22 /*********************************************************************************/
23 /*
24 This DecoderSpecificInfo Class that holds the Mpeg4 VOL header for the
25 video stream
26 */
27
28 #define __IMPLEMENT_AMRDecoderSpecificInfo3GPP__
29
30 #include "3gpp_amrdecoderspecificinfo.h"
31
32 #include "atom.h"
33 #include "atomutils.h"
34
35 const int16 AMRModeSetMask[8] =
36 {
37 0x0001, 0x0002, 0x0004, 0x0008,
38 0x0010, 0x0020, 0x0040, 0x0080,
39 };
40
41 const int32 AMRBitRates[8] =
42 {
43 4750, 5150, 5900, 6700,
44 7400, 7950, 10200, 12200,
45 };
46
47 // Default constructor
AMRSpecificAtom(MP4_FF_FILE * fp,uint32 size,uint32 type)48 AMRSpecificAtom::AMRSpecificAtom(MP4_FF_FILE *fp, uint32 size, uint32 type)
49 : Atom(fp, size, type)
50 {
51 _bitRate = 0;
52
53 if (_success)
54 {
55 AtomUtils::read32(fp, _VendorCode);
56
57 AtomUtils::read8(fp, _decoder_version);
58
59 AtomUtils::read16(fp, _mode_set);
60
61 AtomUtils::read8(fp, _mode_change_period);
62
63 AtomUtils::read8(fp, _frames_per_sample);
64
65 for (uint32 i = 0; i < 8; i++)
66 {
67 if (_mode_set & AMRModeSetMask[i])
68 {
69 _bitRate = AMRBitRates[i];
70 }
71 }
72
73 }
74 }
75
76
77