diff options
Diffstat (limited to 'Src/nsv/nsvplay/mp3stub.cpp')
| -rw-r--r-- | Src/nsv/nsvplay/mp3stub.cpp | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/Src/nsv/nsvplay/mp3stub.cpp b/Src/nsv/nsvplay/mp3stub.cpp new file mode 100644 index 00000000..72df533c --- /dev/null +++ b/Src/nsv/nsvplay/mp3stub.cpp @@ -0,0 +1,73 @@ +#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; +}
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