libmpcodecs/ad_mp3lib.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4
   5 #include "config.h"
   6 #ifdef USE_MP3LIB
   7
   8 #include "ad_internal.h"
   9
  10 static ad_info_t info =
  11 {
  12         "MPEG layer-2, layer-3",
  13         "mp3lib",
  14         "Nick Kurshev",
  15         "mpg123",
  16         "Optimized to MMX/SSE/3Dnow!"
  17 };
  18
  19 LIBAD_EXTERN(mp3lib)
  20
  21 #include "mp3lib/mp3.h"
  22
  23 extern int fakemono;
  24
  25 static sh_audio_t* dec_audio_sh=NULL;
  26
  27 // MP3 decoder buffer callback:
  28 int mplayer_audio_read(char *buf,int size){
  29   return demux_read_data(dec_audio_sh->ds,buf,size);
  30 }
  31
  32 static int preinit(sh_audio_t *sh)
  33 {
  34   sh->audio_out_minsize=32*36*2*2; //4608;
  35   return 1;
  36 }
  37
  38 static int init(sh_audio_t *sh)
  39 {
  40   // MPEG Audio:
  41   dec_audio_sh=sh; // save sh_audio for the callback:
  42 //  MP3_Init(fakemono,mplayer_accel,&mplayer_audio_read); // TODO!!!
  43 #ifdef USE_FAKE_MONO
  44   MP3_Init(fakemono);
  45 #else
  46   MP3_Init();
  47 #endif
  48   MP3_samplerate=MP3_channels=0;
  49   sh->a_buffer_len=MP3_DecodeFrame(sh->a_buffer,-1);
  50   if(!sh->a_buffer_len) return 0; // unsupported layer/format
  51   sh->channels=2; // hack
  52   sh->samplesize=2;
  53   sh->samplerate=MP3_samplerate;
  54   sh->i_bps=MP3_bitrate*(1000/8);
  55   MP3_PrintHeader();
  56   return 1;
  57 }
  58
  59 static void uninit(sh_audio_t *sh)
  60 {
  61 }
  62
  63 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
  64 {
  65     switch(cmd)
  66     {
  67       case ADCTRL_RESYNC_STREAM:
  68           MP3_DecodeFrame(NULL,-2); // resync
  69           MP3_DecodeFrame(NULL,-2); // resync
  70           MP3_DecodeFrame(NULL,-2); // resync
  71           return CONTROL_TRUE;
  72       case ADCTRL_SKIP_FRAME:
  73           MP3_DecodeFrame(NULL,-2); // skip MPEG frame
  74           return CONTROL_TRUE;
  75     }
  76   return CONTROL_UNKNOWN;
  77 }
  78
  79 static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
  80 {
  81    return MP3_DecodeFrame(buf,-1);
  82 }
  83 #endif