winamp/Src/nsv/nsvplay/mp3stub.cpp

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2024-09-24 12:54:57 +00:00
#include "mp3stub.h"
#include "../../mp3dec/mpgadecoder.h"
int mp3_quality;
int mp3_downmix;
class MP3_Decoder : public IAudioDecoder
{
public:
MP3_Decoder() : mp3_dec(mp3_quality,0,mp3_downmix) { fused=0; pcm_buf_used=0; }
~MP3_Decoder() { };
int decode(void *in, int in_len,
void *out, int *out_len,
unsigned int out_fmt[8]);
void flush() { fused=0; pcm_buf_used=0; mp3_dec.Reset(); }
private:
CMpgaDecoder mp3_dec;
char pcm_buf[1152*4*2];
int pcm_buf_used;
int pcm_offs;
int fused;
};
int MP3_Decoder::decode(void *in, int in_len,
void *out, int *out_len,
unsigned int out_fmt[8])
{
int rval=1;
if (fused < in_len)
{
int l=mp3_dec.GetInputFree();
if (l > in_len-fused) l=in_len-fused;
if (l) mp3_dec.Fill((unsigned char *)in + fused,l);
fused+=l;
}
if (!pcm_buf_used)
{
SSC s=mp3_dec.DecodeFrame((unsigned char *)pcm_buf,sizeof(pcm_buf),&pcm_buf_used);
pcm_offs=0;
}
if (pcm_buf_used)
{
int l=*out_len;
if (l > pcm_buf_used) l=pcm_buf_used;
memcpy(out,pcm_buf+pcm_offs,l);
pcm_buf_used-=l;
pcm_offs+=l;
*out_len=l;
}
else
{
if (fused >= in_len) rval=fused=0;
*out_len=0;
}
int nch=mp3_dec.m_Info.GetEffectiveChannels();
int srate=mp3_dec.m_Info.GetEffectiveSFreq();
out_fmt[0]=(nch && srate)?NSV_MAKETYPE('P','C','M',' '):0;
out_fmt[1]=srate;
out_fmt[2]=nch;
out_fmt[3]=(nch && srate)?16:0;
return rval;
}
IAudioDecoder *MP3_CREATE(unsigned int fmt)
{
if (fmt == NSV_MAKETYPE('M','P','3',' ')) return new MP3_Decoder;
return NULL;
}