+/*
+ * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ */
+/*
+ * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
+ * Ahead Software AG
+ */
+
+/** \file aac_common.c common functions of aac_afh and aadcec */
+
#include "para.h"
#include "aac.h"
#include "error.h"
+/**
+ * get a new libfaad decoder handle
+ *
+ */
NeAACDecHandle aac_open(void)
{
NeAACDecHandle h = NeAACDecOpen();
return length;
}
-int aac_find_esds(unsigned char *buf, unsigned buflen, int *skip)
+/**
+ * search for the position and the length of the decoder configuration
+ *
+ * \param buf buffer to seach
+ * \param buflen length of \a buf
+ * \param skip Upon succesful return, this contains the offset in \a buf where
+ * the decoder config starts.
+ *
+ * \return The length of the decoder configuration
+ */
+ssize_t aac_find_esds(unsigned char *buf, size_t buflen, size_t *skip)
{
- int i;
+ size_t i;
for (i = 0; i + 4 < buflen; i++) {
unsigned char *p = buf + i;
continue;
i += 8;
p = buf + i;
- PARA_INFO_LOG("found esds@%d, next: %x\n", i, *p);
+ PARA_INFO_LOG("found esds@%zu, next: %x\n", i, *p);
if (*p == 3)
i += 8;
else
return -E_ESDS;
}
-unsigned aac_read_int32(unsigned char *buf)
-{
- uint8_t *d = (uint8_t*)buf;
- return (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | d[3];
-}
-
-
-int aac_find_entry(unsigned char *buf, unsigned buflen, int *skip)
+/**
+ * search for the first entry in the stco table
+ *
+ * \param buf buffer to seach
+ * \param buflen length of \a buf
+ * \param skip Upon succesful return, this contains the number
+ * of bytes to skip from the input buffer.
+ *
+ * \return the position of the first entry in the table on success,
+ * -E_STCO on errors.
+ */
+ssize_t aac_find_entry_point(unsigned char *buf, size_t buflen, size_t *skip)
{
- int i, ret;
+ ssize_t ret;
+ size_t i;
for (i = 0; i + 20 < buflen; i++) {
unsigned char *p = buf + i;
if (p[0] != 's' || p[1] != 't' || p[2] != 'c' || p[3] != 'o')
continue;
- PARA_INFO_LOG("found stco@%d\n", i);
+ PARA_INFO_LOG("found stco@%zu\n", i);
i += 12;
ret = aac_read_int32(buf + i); /* first offset */
i += 4;
- PARA_INFO_LOG("num entries: %d\n", ret);
+ PARA_INFO_LOG("entry point: %zd\n", ret);
*skip = i;
return ret;
}
- PARA_WARNING_LOG("stco not found, buflen: %d\n", buflen);
+ PARA_WARNING_LOG("stco not found, buflen: %zu\n", buflen);
return -E_STCO;
}
-
-int aac_find_stsz(unsigned char *buf, unsigned buflen, unsigned *skip)
-{
- int i;
-
- for (i = 0; i + 16 < buflen; i++) {
- unsigned char *p = buf + i;
- unsigned sample_count, sample_size;
-
- if (p[0] != 's' || p[1] != 't' || p[2] != 's' || p[3] != 'z')
- continue;
- PARA_INFO_LOG("found stsz@%d\n", i);
- i += 8;
- sample_size = aac_read_int32(buf + i);
- PARA_INFO_LOG("sample size: %d\n", sample_size);
- i += 4;
- sample_count = aac_read_int32(buf + i);
- i += 4;
- PARA_INFO_LOG("sample count: %d\n", sample_count);
- *skip = i;
- return sample_count;
- }
- PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen);
- return -E_STCO;
-}
-