X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=aac_common.c;h=2dc979011be245850cef106167bd4fad611abe1e;hp=16109b9500c08e97c8ece63cc8aa51819b3921bd;hb=7c3bec32f4a34753a40e2c22086ce2353e8a7b9c;hpb=55f0f9461990455656bef7a36b0f963e3d676653

diff --git a/aac_common.c b/aac_common.c
index 16109b95..2dc97901 100644
--- a/aac_common.c
+++ b/aac_common.c
@@ -1,7 +1,35 @@
+/*
+ * 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();
@@ -30,9 +58,19 @@ static int aac_read_decoder_length(unsigned char *buf, int *description_len)
 	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;
@@ -42,7 +80,7 @@ int aac_find_esds(unsigned char *buf, unsigned buflen, int *skip)
 			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
@@ -57,6 +95,7 @@ int aac_find_esds(unsigned char *buf, unsigned buflen, int *skip)
 		if (*p != 5)
 			continue;
 		i++;
+		p = buf + i;
 		decoder_length = aac_read_decoder_length(p, &description_len);
 		PARA_INFO_LOG("decoder length: %d\n", decoder_length);
 		i += description_len;
@@ -66,30 +105,35 @@ int aac_find_esds(unsigned char *buf, unsigned buflen, int *skip)
 	return -E_ESDS;
 }
 
-unsigned aac_read_int32(unsigned char *buf)
+/**
+ * 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)
 {
-	uint8_t *d = (uint8_t*)buf;
-	return (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | d[3];
-}
-
+	ssize_t ret;
+	size_t i;
 
-int find_stco(unsigned char *buf, unsigned buflen, int *skip)
-{
-	int i, ret;
-
-	for (i = 0; i + 16 < buflen; 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);
-		i += 8;
-		ret = aac_read_int32(buf + 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: %zu\n", buflen);
 	return -E_STCO;
 }
-