2 * Copyright (C) 2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file wma_common.c Functions used by both the WMA afh and decoder. */
10 #include <sys/types.h>
20 #include "portable_io.h"
24 const char *search_pattern(const char *pattern, int pattern_len, const char *buf, int buf_size)
26 const char *p, *end = buf + buf_size;
28 if (pattern_len > buf_size)
30 for (p = buf; p + pattern_len < end; p++) {
31 if (memcmp(p, pattern, pattern_len))
33 PARA_DEBUG_LOG("found %d byte pattern@%d\n",
34 pattern_len, p - buf);
37 PARA_NOTICE_LOG("%d byte pattern not found\n", pattern_len);
42 40 9e 69 f8 4d 5b cf 11 a8 fd 00 80 5f 5c 44 2b
44 static int find_audio_stream_info(const char *buf, int len)
46 const char pattern[] = {0x40, 0x9e, 0x69, 0xf8};
47 const char *p = search_pattern(pattern, sizeof(pattern), buf, len);
50 PARA_NOTICE_LOG("audio stream guid not found");
53 PARA_DEBUG_LOG("found audio stream guid@%0zx\n", p - buf);
57 static int read_header_len(char *buf, int len)
63 header_len = read_u16(buf + 16) + 46;
66 PARA_DEBUG_LOG("header_len: %d\n", header_len);
70 int read_asf_header(char *buf, int loaded, struct asf_header_info *ahi)
75 ret = read_header_len(buf, loaded);
78 ahi->header_len = ret;
80 ret = find_audio_stream_info(buf, ahi->header_len);
83 ahi->audio_stream_info_start = ret + 16;
84 start = buf + ahi->audio_stream_info_start;
86 ahi->channels = ((uint8_t *)start)[40];
87 ahi->sample_rate = read_u16(start + 42);
88 PARA_NOTICE_LOG("%d channels, sample rate: %d\n", ahi->channels,
91 ahi->bit_rate = 8 * read_u16(start + 46);
92 PARA_INFO_LOG("bit rate: %d\n", ahi->bit_rate);
94 ahi->block_align = read_u16(start + 50);
95 PARA_INFO_LOG("block_align: %d\n", ahi->block_align);
97 ahi->flags1 = read_u32(start + 56);
98 ahi->flags2 = read_u16(start + 60);
99 PARA_INFO_LOG("read_asf_header: flags1: %d, flag2: %d\n",
100 ahi->flags1, ahi->flags2);
104 const uint8_t log2_tab[256] = {
105 0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
106 4, 4, 4, 4, 4, 4, 4, 4,
107 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
108 5, 5, 5, 5, 5, 5, 5, 5,
109 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
110 6, 6, 6, 6, 6, 6, 6, 6,
111 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
112 6, 6, 6, 6, 6, 6, 6, 6,
113 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
114 7, 7, 7, 7, 7, 7, 7, 7,
115 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
116 7, 7, 7, 7, 7, 7, 7, 7,
117 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
118 7, 7, 7, 7, 7, 7, 7, 7,
119 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
120 7, 7, 7, 7, 7, 7, 7, 7
123 int wma_log2(unsigned int v)
126 if (v & 0xffff0000) {