+/*
+ * Copyright (C) 2006-2013 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+/*
+ * 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.
+ *
+ * \return The handle returned by NeAACDecOpen().
+ */
NeAACDecHandle aac_open(void)
{
NeAACDecHandle h = NeAACDecOpen();
c->downMatrix = 0;
NeAACDecSetConfiguration(h, c);
return h;
-};
+}
-static int aac_read_decoder_length(unsigned char *buf, int *description_len)
+static unsigned long aac_read_decoder_length(unsigned char *buf, int *description_len)
{
uint8_t b;
uint8_t numBytes = 0;
- uint32_t length = 0;
+ unsigned long length = 0;
do {
b = buf[numBytes];
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.
+ * \param decoder_length result pointer that is filled in with the length of
+ * the decoder configuration on success.
+ *
+ * \return positive on success, negative on errors
+ */
+int aac_find_esds(unsigned char *buf, size_t buflen, size_t *skip,
+ unsigned long *decoder_length)
{
- int i;
+ size_t i;
for (i = 0; i + 4 < buflen; i++) {
unsigned char *p = buf + i;
- int decoder_length, description_len;
+ int description_len;
if (p[0] != 'e' || p[1] != 's' || p[2] != 'd' || p[3] != 's')
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
continue;
i++;
p = buf + i;
- decoder_length = aac_read_decoder_length(p, &description_len);
- PARA_INFO_LOG("decoder length: %d\n", decoder_length);
+ *decoder_length = aac_read_decoder_length(p, &description_len);
+ PARA_INFO_LOG("decoder length: %lu\n", *decoder_length);
i += description_len;
*skip = i;
- return decoder_length;
+ return 1;
}
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);
- 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);
+ PARA_WARNING_LOG("stco not found, buflen: %zu\n", buflen);
return -E_STCO;
}
-