Initial community commit

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;
+}