aac: add GPL headers to all files
[paraslash.git] / aac_common.c
1 /*
2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18 /*
19 * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
20 * Ahead Software AG
21 */
22
23 /** \file aac_ccomon.c common functions of aac_afh and aadcec */
24
25 #include "para.h"
26 #include "aac.h"
27 #include "error.h"
28
29 NeAACDecHandle aac_open(void)
30 {
31 NeAACDecHandle h = NeAACDecOpen();
32 NeAACDecConfigurationPtr c = NeAACDecGetCurrentConfiguration(h);
33
34 c->defObjectType = LC;
35 c->outputFormat = FAAD_FMT_16BIT;
36 c->downMatrix = 0;
37 NeAACDecSetConfiguration(h, c);
38 return h;
39 };
40
41 static int aac_read_decoder_length(unsigned char *buf, int *description_len)
42 {
43 uint8_t b;
44 uint8_t numBytes = 0;
45 uint32_t length = 0;
46
47 do {
48 b = buf[numBytes];
49 numBytes++;
50 length = (length << 7) | (b & 0x7F);
51 } while
52 ((b & 0x80) && numBytes < 4);
53 *description_len = numBytes;
54 return length;
55 }
56
57 int aac_find_esds(unsigned char *buf, unsigned buflen, int *skip)
58 {
59 int i;
60
61 for (i = 0; i + 4 < buflen; i++) {
62 unsigned char *p = buf + i;
63 int decoder_length, description_len;
64
65 if (p[0] != 'e' || p[1] != 's' || p[2] != 'd' || p[3] != 's')
66 continue;
67 i += 8;
68 p = buf + i;
69 PARA_INFO_LOG("found esds@%d, next: %x\n", i, *p);
70 if (*p == 3)
71 i += 8;
72 else
73 i += 6;
74 p = buf + i;
75 PARA_INFO_LOG("next: %x\n", *p);
76 if (*p != 4)
77 continue;
78 i += 18;
79 p = buf + i;
80 PARA_INFO_LOG("next: %x\n", *p);
81 if (*p != 5)
82 continue;
83 i++;
84 p = buf + i;
85 decoder_length = aac_read_decoder_length(p, &description_len);
86 PARA_INFO_LOG("decoder length: %d\n", decoder_length);
87 i += description_len;
88 *skip = i;
89 return decoder_length;
90 }
91 return -E_ESDS;
92 }
93
94 unsigned aac_read_int32(unsigned char *buf)
95 {
96 uint8_t *d = (uint8_t*)buf;
97 return (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | d[3];
98 }
99
100
101 int aac_find_entry_point(unsigned char *buf, unsigned buflen, int *skip)
102 {
103 int i, ret;
104
105 for (i = 0; i + 20 < buflen; i++) {
106 unsigned char *p = buf + i;
107
108 if (p[0] != 's' || p[1] != 't' || p[2] != 'c' || p[3] != 'o')
109 continue;
110 PARA_INFO_LOG("found stco@%d\n", i);
111 i += 12;
112 ret = aac_read_int32(buf + i); /* first offset */
113 i += 4;
114 PARA_INFO_LOG("num entries: %d\n", ret);
115 *skip = i;
116 return ret;
117 }
118 PARA_WARNING_LOG("stco not found, buflen: %d\n", buflen);
119 return -E_STCO;
120 }
121