/** \file wma.h The asf_header structure and public wma function declarations. */

/**
 * Information contained in an asf audio file header.
 *
 * Both para_filter and para_afh need to read the header.
 */
struct asf_header_info {
	/** The size of the audio file header. */
	int header_len;
	/** Offset of the audio stream info header. */
	int audio_stream_info_start;
	/** Number of channels. */
	uint8_t channels;
	/** One of the 5 possible sample rates. */
	uint16_t sample_rate;
	/** Size of one data block. */
	uint16_t block_align;
	/** Bits per second. */
	uint32_t bit_rate;
	/** Further decoding information (ignored). */
	uint32_t flags1;
	/** Encodes exp_vlc, bit reservoir, vbl, number of block sizes. */
	uint16_t flags2;
 	/** Whether exponents are coded with VLC codes. */
	bool use_exp_vlc;
 	/** If false, a frame is equal to a superframe. */
	bool use_bit_reservoir;
	/** Whether blocks are of variable or of constant size. */
	bool use_variable_block_len;
	/** Obtained from the file properties object. */
	uint32_t packet_size;
};

/* wma_common.c */
__a_const int wma_log2(unsigned int v);
const char *search_pattern(const uint8_t *pattern, int pattern_len,
		const char *buf, int buf_size);
int read_asf_header(const char *buf, int loaded, struct asf_header_info *ahi);

#define WMA_FRAME_SKIP 31