libmpcodecs/ad_mp3lib.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22
  23 #include "config.h"
  24
  25 #include "ad_internal.h"
  26
  27 static const ad_info_t info =
  28 {
  29         "MPEG layer-2, layer-3",
  30         "mp3lib",
  31         "Nick Kurshev",
  32         "mpg123",
  33         "Optimized to MMX/SSE/3Dnow!"
  34 };
  35
  36 LIBAD_EXTERN(mp3lib)
  37
  38 #include "mp3lib/mp3.h"
  39
  40 extern int fakemono;
  41
  42 static sh_audio_t* dec_audio_sh=NULL;
  43
  44 // MP3 decoder buffer callback:
  45 int mplayer_audio_read(char *buf,int size){
  46   return demux_read_data(dec_audio_sh->ds,buf,size);
  47 }
  48
  49 static int preinit(sh_audio_t *sh)
  50 {
  51   sh->audio_out_minsize=32*36*2*2; //4608;
  52   return 1;
  53 }
  54
  55 static int init(sh_audio_t *sh)
  56 {
  57   // MPEG Audio:
  58   dec_audio_sh=sh; // save sh_audio for the callback:
  59 //  MP3_Init(fakemono,mplayer_accel,&mplayer_audio_read); // TODO!!!
  60 #ifdef CONFIG_FAKE_MONO
  61   MP3_Init(fakemono);
  62 #else
  63   MP3_Init();
  64 #endif
  65   MP3_samplerate=MP3_channels=0;
  66   sh->a_buffer_len=MP3_DecodeFrame(sh->a_buffer,-1);
  67   if(!sh->a_buffer_len) return 0; // unsupported layer/format
  68   sh->channels=2; // hack
  69   sh->samplesize=2;
  70   sh->samplerate=MP3_samplerate;
  71   sh->i_bps=MP3_bitrate*(1000/8);
  72   MP3_PrintHeader();
  73   return 1;
  74 }
  75
  76 static void uninit(sh_audio_t *sh)
  77 {
  78 }
  79
  80 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
  81 {
  82     switch(cmd)
  83     {
  84       case ADCTRL_RESYNC_STREAM:
  85           MP3_DecodeFrame(NULL,-2); // resync
  86           MP3_DecodeFrame(NULL,-2); // resync
  87           MP3_DecodeFrame(NULL,-2); // resync
  88           return CONTROL_TRUE;
  89       case ADCTRL_SKIP_FRAME:
  90           MP3_DecodeFrame(NULL,-2); // skip MPEG frame
  91           return CONTROL_TRUE;
  92     }
  93   return CONTROL_UNKNOWN;
  94 }
  95
  96 static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
  97 {
  98    return MP3_DecodeFrame(buf,-1);
  99 }