REVISION
Definition in file DECODER__mp3first.c.
#include "../SYSTEM/sys_hardware.h"
#include "../codec/codec.h"
#include "../coder/coder.h"
#include "decoder.h"
Include dependency graph for DECODER__mp3first.c:
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Functions | |
| BOOL | DECODER__mp3first (void) |
| Function check to set up mp3 decoder input bit stream. | |
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Function check to set up mp3 decoder input bit stream.
Definition at line 37 of file DECODER__mp3first.c. References Audio, st_DECODER::averageWordRate, st_DECODER::decodeBitstrm, Decoder, DECODER__mp3(), st_AUDIO::duration, st_AUDIO::file, st_DECODER::firstPacketOffset, st_DECODER::flag, st_AUDIO::fptr, st_AUDIO::offset, st_PCM::sampleRate, File::size, and st_DECODER::status. 00038 {
00039 USHORT strmLen;
00040 //USHORT * pDst;
00041
00042 /* Locate first available frame sync. */
00043 //while(1)
00044 {
00045 /* This will cause potential reentry problem in media task!
00046 BITSTRM_pack(Decoder.inputBitstrm);
00047 strmLen = BITSTRM_numWordsFree(Decoder.inputBitstrm);
00048 pDst = (unsigned short *)BITSTRM_writePtr(Decoder.inputBitstrm);
00049 strmLen = DECODER_getData((int*)pDst, strmLen);
00050
00051 // Is data available?
00052 if(strmLen == 0) break;
00053
00054 // Add to decoder bitstream object.
00055 BITSTRM_add(Decoder.inputBitstrm, strmLen);
00056 */
00057
00058 BITSTRM_pack(Decoder.decodeBitstrm);
00059 strmLen = BITSTRM_numDataWords(Decoder.decodeBitstrm);
00060 if(strmLen > 32)
00061 {
00062 if( DECODER__mp3findSync(&Decoder, 0) == 0 )
00063 {
00064 PCM_samplerateChanged();
00065 Pcm.sampleRate = Decoder.status.sampleRate;
00066 // Initialize status frameSize, which will then be used
00067 // in DECODER__mp3 to determine if enough data is
00068 // available in input bitstream.
00069 Decoder.status.frameSize = MAX_INPUT_FRAME_SIZE;
00070 mp3FastFwdLen = 5L*Decoder.status.bitRate>>4;
00071
00072 BITSTRM_pack(Decoder.decodeBitstrm);
00073 strmLen = BITSTRM_numDataWords(Decoder.decodeBitstrm);
00074 Decoder.firstPacketOffset = Audio.fptr - strmLen;
00075
00076 Decoder.averageWordRate =
00077 (Audio.file.size-Decoder.firstPacketOffset)/(Audio.duration+1);
00078 if(0 == Decoder.averageWordRate)
00079 Decoder.averageWordRate = Decoder.status.bitRate>>4;
00080
00081 if(Audio.offset)
00082 {
00083 Decoder.flag |= DEC_FFWD|DEC_MEDIASEEK;
00084 DECODER__mp3();
00085 }
00086 return TRUE;
00087 }
00088 }
00089 }
00090 // Return FALSE if sync is not found, coder will keep calling this routine
00091 // until sync is found or media has been gone through completely.
00092 return FALSE;
00093 }
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1.3.9.1