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[paraslash.git] / wma_common.c

diff --git a/wma_common.c b/wma_common.c
index b101d0a6e88e921d814e630113d59a263a657fd1..b123b5d2104a24500b8123f94bc7e2c6b8622fbc 100644 (file)
--- a/wma_common.c
+++ b/wma_common.c
@@ -1,18 +1,8 @@
-/*
- * Copyright (C) 2009-2013 Andre Noll <maan@systemlinux.org>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 2009 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
 
 /** \file wma_common.c Functions used by both the WMA afh and decoder. */
 
-#include <inttypes.h>
 #include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <string.h>
 
 #include "para.h"
 #include "error.h"
@@ -48,6 +38,17 @@ const char *search_pattern(const char *pattern, int pattern_len,
        return NULL;
 }
 
+static int find_file_properties(const char *buf, int len)
+{
+       const char pattern[] = {0xa1, 0xdc, 0xab, 0x8c};
+       const char *p = search_pattern(pattern, sizeof(pattern), buf, len);
+
+       if (!p)
+               return -E_WMA_NO_GUID;
+       PARA_DEBUG_LOG("found file property guid@%0x\n", (unsigned)(p - buf));
+       return p - buf + 16;
+}
+
 /*
    40 9e 69 f8 4d 5b cf 11  a8 fd 00 80 5f 5c 44 2b
  */
@@ -58,7 +59,7 @@ static int find_audio_stream_info(const char *buf, int len)
 
        if (!p)
                return -E_WMA_NO_GUID;
-       PARA_DEBUG_LOG("found audio stream guid@%0x\n", (int)(p - buf));
+       PARA_DEBUG_LOG("found audio stream guid@%0x\n", (unsigned)(p - buf));
        return p - buf + 16;
 }
 
@@ -106,15 +107,33 @@ int read_asf_header(const char *buf, int loaded, struct asf_header_info *ahi)
                ahi->sample_rate);
 
        ahi->bit_rate = 8 * read_u16(start + 46);
-       PARA_INFO_LOG("bit rate: %d\n", ahi->bit_rate);
+       PARA_INFO_LOG("bit rate: %u\n", ahi->bit_rate);
 
        ahi->block_align = read_u16(start + 50);
        PARA_INFO_LOG("block_align: %d\n", ahi->block_align);
 
        ahi->flags1 = read_u32(start + 56);
        ahi->flags2 = read_u16(start + 60);
-       PARA_INFO_LOG("read_asf_header: flags1: %d, flag2: %d\n",
+       PARA_INFO_LOG("read_asf_header: flags1: %u, flags2: %u\n",
                ahi->flags1, ahi->flags2);
+       ahi->use_exp_vlc = ahi->flags2 & 0x0001;
+       ahi->use_bit_reservoir = ahi->flags2 & 0x0002;
+       ahi->use_variable_block_len = ahi->flags2 & 0x0004;
+
+       ret = find_file_properties(buf, ahi->header_len);
+       if (ret < 0)
+               return ret;
+       /* file property header is always 88 bytes (sans GUID) */
+       if (ret + 88 > loaded)
+               return 0;
+       start = buf + ret;
+       ahi->packet_size = read_u32(start + 76); /* min packet size */
+       /* we only support fixed packet sizes */
+       if (ahi->packet_size != read_u32(start + 80)) /* min != max */
+               return -E_BAD_ASF_FILE_PROPS;
+       if (ahi->packet_size <= ahi->block_align)
+               return -E_BAD_ASF_FILE_PROPS;
+       PARA_INFO_LOG("packet size: %u\n", ahi->packet_size);
        return 1;
 }
 
@@ -155,7 +174,5 @@ __a_const int wma_log2(unsigned int v)
                v >>= 8;
                n += 8;
        }
-       n += log2_tab[v];
-
-       return n;
+       return n + log2_tab[v];
 }