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