2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
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.
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.
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.
19 * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
23 /** \file aac_ccomon.c common functions of aac_afh and aadcec */
29 NeAACDecHandle aac_open(void)
31 NeAACDecHandle h = NeAACDecOpen();
32 NeAACDecConfigurationPtr c = NeAACDecGetCurrentConfiguration(h);
34 c->defObjectType = LC;
35 c->outputFormat = FAAD_FMT_16BIT;
37 NeAACDecSetConfiguration(h, c);
41 static int aac_read_decoder_length(unsigned char *buf, int *description_len)
50 length = (length << 7) | (b & 0x7F);
52 ((b & 0x80) && numBytes < 4);
53 *description_len = numBytes;
57 int aac_find_esds(unsigned char *buf, unsigned buflen, int *skip)
61 for (i = 0; i + 4 < buflen; i++) {
62 unsigned char *p = buf + i;
63 int decoder_length, description_len;
65 if (p[0] != 'e' || p[1] != 's' || p[2] != 'd' || p[3] != 's')
69 PARA_INFO_LOG("found esds@%d, next: %x\n", i, *p);
75 PARA_INFO_LOG("next: %x\n", *p);
80 PARA_INFO_LOG("next: %x\n", *p);
85 decoder_length = aac_read_decoder_length(p, &description_len);
86 PARA_INFO_LOG("decoder length: %d\n", decoder_length);
89 return decoder_length;
94 unsigned aac_read_int32(unsigned char *buf)
96 uint8_t *d = (uint8_t*)buf;
97 return (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | d[3];
101 int aac_find_entry_point(unsigned char *buf, unsigned buflen, int *skip)
105 for (i = 0; i + 20 < buflen; i++) {
106 unsigned char *p = buf + i;
108 if (p[0] != 's' || p[1] != 't' || p[2] != 'c' || p[3] != 'o')
110 PARA_INFO_LOG("found stco@%d\n", i);
112 ret = aac_read_int32(buf + i); /* first offset */
114 PARA_INFO_LOG("num entries: %d\n", ret);
118 PARA_WARNING_LOG("stco not found, buflen: %d\n", buflen);