5 NeAACDecHandle
aac_open(void)
7 NeAACDecHandle h
= NeAACDecOpen();
8 NeAACDecConfigurationPtr c
= NeAACDecGetCurrentConfiguration(h
);
10 c
->defObjectType
= LC
;
11 c
->outputFormat
= FAAD_FMT_16BIT
;
13 NeAACDecSetConfiguration(h
, c
);
17 static int aac_read_decoder_length(unsigned char *buf
, int *description_len
)
26 length
= (length
<< 7) | (b
& 0x7F);
28 ((b
& 0x80) && numBytes
< 4);
29 *description_len
= numBytes
;
33 int aac_find_esds(unsigned char *buf
, unsigned buflen
, int *skip
)
37 for (i
= 0; i
+ 4 < buflen
; i
++) {
38 unsigned char *p
= buf
+ i
;
39 int decoder_length
, description_len
;
41 if (p
[0] != 'e' || p
[1] != 's' || p
[2] != 'd' || p
[3] != 's')
45 PARA_INFO_LOG("found esds@%d, next: %x\n", i
, *p
);
51 PARA_INFO_LOG("next: %x\n", *p
);
56 PARA_INFO_LOG("next: %x\n", *p
);
61 decoder_length
= aac_read_decoder_length(p
, &description_len
);
62 PARA_INFO_LOG("decoder length: %d\n", decoder_length
);
65 return decoder_length
;
70 unsigned aac_read_int32(unsigned char *buf
)
72 uint8_t *d
= (uint8_t*)buf
;
73 return (d
[0] << 24) | (d
[1] << 16) | (d
[2] << 8) | d
[3];
77 int aac_find_stco(unsigned char *buf
, unsigned buflen
, int *skip
)
81 for (i
= 0; i
+ 16 < buflen
; i
++) {
82 unsigned char *p
= buf
+ i
;
84 if (p
[0] != 's' || p
[1] != 't' || p
[2] != 'c' || p
[3] != 'o')
86 PARA_INFO_LOG("found stco@%d\n", i
);
88 ret
= aac_read_int32(buf
+ i
);
90 PARA_INFO_LOG("num entries: %d\n", ret
);
94 PARA_WARNING_LOG("stco not found, buflen: %d\n", buflen
);
98 int aac_find_stsz(unsigned char *buf
, unsigned buflen
, unsigned *skip
)
102 for (i
= 0; i
+ 16 < buflen
; i
++) {
103 unsigned char *p
= buf
+ i
;
104 unsigned sample_count
, sample_size
;
106 if (p
[0] != 's' || p
[1] != 't' || p
[2] != 's' || p
[3] != 'z')
108 PARA_INFO_LOG("found stsz@%d\n", i
);
110 sample_size
= aac_read_int32(buf
+ i
);
111 PARA_INFO_LOG("sample size: %d\n", sample_size
);
113 sample_count
= aac_read_int32(buf
+ i
);
115 PARA_INFO_LOG("sample count: %d\n", sample_count
);
119 PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen
);