libmpcodecs/ad_mp3lib.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4
   5 #include "config.h"
   6
   7 #include "ad_internal.h"
   8
   9 static ad_info_t info =
  10 {
  11         "MPEG layer-2, layer-3",
  12         "mp3lib",
  13         "Nick Kurshev",
  14         "mpg123",
  15         "Optimized to MMX/SSE/3Dnow!"
  16 };
  17
  18 LIBAD_EXTERN(mp3lib)
  19
  20 #include "mp3lib/mp3.h"
  21
  22 extern int fakemono;
  23
  24 static sh_audio_t* dec_audio_sh=NULL;
  25
  26 // MP3 decoder buffer callback:
  27 int mplayer_audio_read(char *buf,int size){
  28   return demux_read_data(dec_audio_sh->ds,buf,size);
  29 }
  30
  31 static int preinit(sh_audio_t *sh)
  32 {
  33   sh->audio_out_minsize=32*36*2*2; //4608;
  34   return 1;
  35 }
  36
  37 static int init(sh_audio_t *sh)
  38 {
  39   // MPEG Audio:
  40   dec_audio_sh=sh; // save sh_audio for the callback:
  41 //  MP3_Init(fakemono,mplayer_accel,&mplayer_audio_read); // TODO!!!
  42 #ifdef USE_FAKE_MONO
  43   MP3_Init(fakemono);
  44 #else
  45   MP3_Init();
  46 #endif
  47   MP3_samplerate=MP3_channels=0;
  48   sh->a_buffer_len=MP3_DecodeFrame(sh->a_buffer,-1);
  49   if(!sh->a_buffer_len) return 0; // unsupported layer/format
  50   sh->channels=2; // hack
  51   sh->samplesize=2;
  52   sh->samplerate=MP3_samplerate;
  53   sh->i_bps=MP3_bitrate*(1000/8);
  54   MP3_PrintHeader();
  55   return 1;
  56 }
  57
  58 static void uninit(sh_audio_t *sh)
  59 {
  60 }
  61
  62 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
  63 {
  64     switch(cmd)
  65     {
  66       case ADCTRL_RESYNC_STREAM:
  67           MP3_DecodeFrame(NULL,-2); // resync
  68           MP3_DecodeFrame(NULL,-2); // resync
  69           MP3_DecodeFrame(NULL,-2); // resync
  70           return CONTROL_TRUE;
  71       case ADCTRL_SKIP_FRAME:
  72           MP3_DecodeFrame(NULL,-2); // skip MPEG frame
  73           return CONTROL_TRUE;
  74     }
  75   return CONTROL_UNKNOWN;
  76 }
  77
  78 static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
  79 {
  80    return MP3_DecodeFrame(buf,-1);
  81 }