Fix some typos.

[paraslash.git] / aac_common.c

diff --git a/aac_common.c b/aac_common.c
index 3739be9dfa450824f592ff7f5848a5377c3c038a..1c3ca27b52dcbd813d2a7f7bdea9c4152b7137c0 100644 (file)
--- a/aac_common.c
+++ b/aac_common.c
@@ -1,7 +1,23 @@
+/*
+ * Copyright (C) 2006-2007 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
+ *
+ */
 NeAACDecHandle aac_open(void)
 {
        NeAACDecHandle h = NeAACDecOpen();
@@ -14,11 +30,11 @@ NeAACDecHandle aac_open(void)
        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];
@@ -30,19 +46,32 @@ 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.
+ * \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
@@ -58,65 +87,44 @@ int aac_find_esds(unsigned char *buf, unsigned buflen, int *skip)
                        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_stco(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 + 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: %d\n", buflen);
-       return -E_STCO;
-}
-
-int aac_find_stsz(unsigned char *buf, unsigned buflen, unsigned *skip)
-{
-       int i, ret;
-
-       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;
 }
-