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[paraslash.git] / wma.h
1 /** \file wma.h The asf_header structure and public wma function declarations. */
2
3 /**
4 * Information contained in an asf audio file header.
5 *
6 * Both para_filter and para_afh need to read the header.
7 */
8 struct asf_header_info {
9 /** The size of the audio file header. */
10 int header_len;
11 /** Offset of the audio stream info header. */
12 int audio_stream_info_start;
13 /** Number of channels. */
14 uint8_t channels;
15 /** One of the 5 possible sample rates. */
16 uint16_t sample_rate;
17 /** Size of one data block. */
18 uint16_t block_align;
19 /** Bits per second. */
20 uint32_t bit_rate;
21 /** Further decoding information (ignored). */
22 uint32_t flags1;
23 /** Whether to use exp_vlc, bit reservoir, variable block len. */
24 uint16_t flags2;
25 };
26
27 /* wma_common.c */
28 int wma_log2(unsigned int v);
29 const char *search_pattern(const char *pattern, int pattern_len,
30 const char *buf, int buf_size);
31 int read_asf_header(const char *buf, int loaded, struct asf_header_info *ahi);
32
33 #define WMA_FRAME_SKIP 31