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 */
30 * get a new libfaad decoder handle
33 NeAACDecHandle aac_open(void)
35 NeAACDecHandle h = NeAACDecOpen();
36 NeAACDecConfigurationPtr c = NeAACDecGetCurrentConfiguration(h);
38 c->defObjectType = LC;
39 c->outputFormat = FAAD_FMT_16BIT;
41 NeAACDecSetConfiguration(h, c);
45 static int aac_read_decoder_length(unsigned char *buf, int *description_len)
54 length = (length << 7) | (b & 0x7F);
56 ((b & 0x80) && numBytes < 4);
57 *description_len = numBytes;
61 int aac_find_esds(unsigned char *buf, unsigned buflen, int *skip)
65 for (i = 0; i + 4 < buflen; i++) {
66 unsigned char *p = buf + i;
67 int decoder_length, description_len;
69 if (p[0] != 'e' || p[1] != 's' || p[2] != 'd' || p[3] != 's')
73 PARA_INFO_LOG("found esds@%d, next: %x\n", i, *p);
79 PARA_INFO_LOG("next: %x\n", *p);
84 PARA_INFO_LOG("next: %x\n", *p);
89 decoder_length = aac_read_decoder_length(p, &description_len);
90 PARA_INFO_LOG("decoder length: %d\n", decoder_length);
93 return decoder_length;
98 unsigned aac_read_int32(unsigned char *buf)
100 uint8_t *d = (uint8_t*)buf;
101 return (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | d[3];
105 * search for the first entry in the stco table
107 * \param buf buffer to seach
108 * \param buflen length of \a buf
109 * \param skip Upon succesful return, this contains the number
110 * of bytes to skip from the input buffer.
112 * \return the position of the first entry in the table on success,
116 int aac_find_entry_point(unsigned char *buf, unsigned buflen, int *skip)
120 for (i = 0; i + 20 < buflen; i++) {
121 unsigned char *p = buf + i;
123 if (p[0] != 's' || p[1] != 't' || p[2] != 'c' || p[3] != 'o')
125 PARA_INFO_LOG("found stco@%d\n", i);
127 ret = aac_read_int32(buf + i); /* first offset */
129 PARA_INFO_LOG("num entries: %d\n", ret);
133 PARA_WARNING_LOG("stco not found, buflen: %d\n", buflen);