mpv/libmpcodecs/ad_real.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "config.h"

#ifdef USE_REALCODECS

#include <stddef.h>
#include <dlfcn.h>

#include "ad_internal.h"

static ad_info_t info =  {
	"RealAudio decoder",  // name of the driver
	"real",   // driver name. should be the same as filename without ad_
	AFM_REAL,    // replace with registered AFM number
	"A'rpi",     // writer/maintainer of _this_ file
	"",          // writer/maintainer/site of the _codec_
	""           // comments
};

LIBAD_EXTERN(real)

static void *handle=NULL;

void *__builtin_new(unsigned long size) {
	return malloc(size);
}


static ulong (*raCloseCodec)(ulong);
static ulong (*raDecode)(ulong,ulong,ulong,ulong,ulong,ulong);
static ulong (*raFlush)(ulong,ulong,ulong);
static ulong (*raFreeDecoder)(ulong);
static ulong (*raGetFlavorProperty)(ulong,ulong,ulong,ulong);
//static ulong (*raGetNumberOfFlavors2)(void);
static ulong (*raInitDecoder)(ulong,ulong);
static ulong (*raOpenCodec2)(ulong);
static ulong (*raSetFlavor)(ulong,ulong);
static void  (*raSetDLLAccessPath)(ulong);

typedef struct {
    int samplerate;
    short bits;
    short channels;
    int unk1;
    int unk2;
    int packetsize;
    int unk3;
    void* unk4;
} ra_init_t;

static int preinit(sh_audio_t *sh){
  // let's check if the driver is available, return 0 if not.
  // (you should do that if you use external lib(s) which is optional)
  unsigned int result;
  handle = dlopen ("/usr/local/RealPlayer8/Codecs/cook.so.6.0", RTLD_LAZY);
  if(!handle){
      mp_msg(MSGT_DECAUDIO,MSGL_WARN,"Cannot open dll: %s\n",dlerror());
      return 0;
  }

    raCloseCodec = dlsym(handle, "RACloseCodec");
    raDecode = dlsym(handle, "RADecode");
    raFlush = dlsym(handle, "RAFlush");
    raFreeDecoder = dlsym(handle, "RAFreeDecoder");
    raGetFlavorProperty = dlsym(handle, "RAGetFlavorProperty");
    raOpenCodec2 = dlsym(handle, "RAOpenCodec2");
    raInitDecoder = dlsym(handle, "RAInitDecoder");
    raSetFlavor = dlsym(handle, "RASetFlavor");
    raSetDLLAccessPath = dlsym(handle, "SetDLLAccessPath");
    
  if(!raCloseCodec || !raDecode || !raFlush || !raFreeDecoder ||
     !raGetFlavorProperty || !raOpenCodec2 || !raSetFlavor ||
     !raSetDLLAccessPath || !raInitDecoder){
      mp_msg(MSGT_DECAUDIO,MSGL_WARN,"Cannot resolve symbols - incompatible dll\n");
      return 0;
  }

    result=raOpenCodec2(&sh->context);
    if(result){
      mp_msg(MSGT_DECAUDIO,MSGL_WARN,"Decoder open failed, error code: 0x%X\n",result);
      return 0;
    }

  sh->samplerate=sh->wf->nSamplesPerSec;
  sh->samplesize=sh->wf->wBitsPerSample/8;
  sh->channels=sh->wf->nChannels;

  { unsigned char temp2[16]={1,0,0,3,4,0,0,0x14,0,0,0,0,0,1,0,3};
    // note: temp2[] come from audio stream extra header (last 16 of the total 24 bytes)
    ra_init_t init_data={
	sh->wf->nSamplesPerSec,sh->wf->wBitsPerSample,sh->wf->nChannels,
	100, 60,  // ?????
	sh->wf->nBlockAlign,
	16, // ??
	((char*)(sh->wf+1))+2+8
    };
    result=raInitDecoder(sh->context,&init_data);
    if(result){
      mp_msg(MSGT_DECAUDIO,MSGL_WARN,"Decoder init failed, error code: 0x%X\n",result);
      return 0;
    }
  }
  
    result=raSetFlavor(sh->context,*((short*)(sh->wf+1)));
    if(result){
      mp_msg(MSGT_DECAUDIO,MSGL_WARN,"Decoder flavor setup failed, error code: 0x%X\n",result);
      return 0;
    }

  sh->audio_out_minsize=128000; //sh->samplerate*sh->samplesize*sh->channels;
  sh->audio_in_minsize=2*sh->wf->nBlockAlign;
//  sh->samplesize=2;
//  sh->channels=2;
//  sh->samplerate=44100;
//  sh->sample_format=AFMT_S16_LE;
  sh->i_bps=64000/8;
  
  return 1; // return values: 1=OK 0=ERROR
}

static int init(sh_audio_t *sh_audio){
  // initialize the decoder, set tables etc...

  // you can store HANDLE or private struct pointer at sh->context
  // you can access WAVEFORMATEX header at sh->wf
  
  // set sample format/rate parameters if you didn't do it in preinit() yet.

  return 1; // return values: 1=OK 0=ERROR
}

static void uninit(sh_audio_t *sh){
  // uninit the decoder etc...
  // again: you don't have to free() a_in_buffer here! it's done by the core.
}

static int decode_audio(sh_audio_t *sh,unsigned char *buf,int minlen,int maxlen){
  int result;
  int len=-1;
  
  demux_read_data(sh->ds, sh->a_in_buffer, 60);
  
  result=raDecode(sh->context, sh->a_in_buffer, sh->wf->nBlockAlign,
       buf, &len, -1);
       
  printf("radecode: %d bytes, res=0x%X  \n",len,result);

  // audio decoding. the most important thing :)
  // parameters you get:
  //  buf = pointer to the output buffer, you have to store uncompressed 
  //        samples there
  //  minlen = requested minimum size (in bytes!) of output. it's just a
  //        _recommendation_, you can decode more or less, it just tell you that
  //        the caller process needs 'minlen' bytes. if it gets less, it will
  //        call decode_audio() again.
  //  maxlen = maximum size (bytes) of output. you MUST NOT write more to the
  //        buffer, it's the upper-most limit!
  //        note: maxlen will be always greater or equal to sh->audio_out_minsize

  // now, let's decode...  
  
  // you can read the compressed stream using the demux stream functions:
  //  demux_read_data(sh->ds, buffer, length) - read 'length' bytes to 'buffer'
  //  ds_get_packet(sh->ds, &buffer) - set ptr buffer to next data packet
  // (both func return number of bytes or 0 for error)

  return len/8; // return value: number of _bytes_ written to output buffer,
              // or -1 for EOF (or uncorrectable error)
}

static int control(sh_audio_t *sh,int cmd,void* arg, ...){
    // various optional functions you MAY implement:
    switch(cmd){
      case ADCTRL_RESYNC_STREAM:
        // it is called once after seeking, to resync.
	// Note: sh_audio->a_in_buffer_len=0; is done _before_ this call!
	return CONTROL_TRUE;
      case ADCTRL_SKIP_FRAME:
        // it is called to skip (jump over) small amount (1/10 sec or 1 frame)
	// of audio data - used to sync audio to video after seeking
	// if you don't return CONTROL_TRUE, it will defaults to:
	//      ds_fill_buffer(sh_audio->ds);  // skip 1 demux packet
	return CONTROL_TRUE;
    }
  return CONTROL_UNKNOWN;
}

#endif