DECODER__wmafirst.c File Reference

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Detailed Description

This module provides function to set up WMA decoder data input.

REVISION

• 12/03/2003 M.GAO
  Initial creation.

Definition in file DECODER__wmafirst.c.

#include "../SYSTEM/sys_hardware.h"
#include "../SYSTEM/sys_assert.h"
#include "../codec/codec.h"
#include "../coder/coder.h"
#include "../TISTD/wma_ti.h"
#include "decoder.h"

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Functions
BOOL	DECODER__wmainit (void)
	Function check to init WMA decoder input bit stream.
BOOL	DECODER__wmafirst (void)
	Function bridges the WMA subcoder to main decoder handle.

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Function Documentation

BOOL DECODER__wmafirst (  void   )

Function bridges the WMA subcoder to main decoder handle. Returns: TRUE if subcoder has been inited, otherwise FALSE. Definition at line 90 of file DECODER__wmafirst.c. References st_CODER::subcoderInit. { if(Coder.subcoderInit) return FALSE; else return TRUE; }

BOOL DECODER__wmainit (  void   )

Function check to init WMA decoder input bit stream. Returns: TRUE if valid WMA stream header is found, otherwise FALSE. Definition at line 41 of file DECODER__wmafirst.c. References Audio, st_DECODER::averageWordRate, st_DECODER::decode, st_DECODER::decodeBitstrm, Decoder, DECODER__wmatask(), st_AUDIO::duration, st_AUDIO::file, st_DECODER::firstPacketOffset, st_DECODER::flag, st_AUDIO::offset, st_PCM::sampleRate, File::size, and st_DECODER::status. { USHORT strmLen; BITSTRM_pack(Decoder.decodeBitstrm); strmLen = BITSTRM_numDataWords(Decoder.decodeBitstrm); if(strmLen > WMA_MAX_INPUT_FRAME_SIZE) { // Decode to validate audio data and return status. WMA_task(); DECODE_getStatus(Decoder.decode, &Decoder.status); BITSTRM_pack(Decoder.decodeBitstrm); if(Decoder.status.isValid) { PCM_samplerateChanged(); Pcm.sampleRate = Decoder.status.sampleRate; Decoder.averageWordRate = (Audio.file.size-FIRST_PACKET_OFFSET)/(Audio.duration+1); if(0 == Decoder.averageWordRate) Decoder.averageWordRate = Decoder.status.bitRate>>4; // Aligned on packet length boundary. wmaFastFwdLen = 5L*(Decoder.status.bitRate>>4); wmaFastFwdLen /= Decoder.status.frameSize; wmaFastFwdLen *= Decoder.status.frameSize; Decoder.firstPacketOffset = FIRST_PACKET_OFFSET; // Seek to start offset. if(Audio.offset) { Decoder.flag |= DEC_FFWD|DEC_MEDIASEEK; DECODER__wmatask(); } return TRUE; } } return FALSE; }

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