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/*

 * mad - MPEG audio decoder

 * Copyright (C) 2000-2001 Robert Leslie

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * $Id: minimad.c,v 1.4 2001-11-07 10:44:11 simons Exp $

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#ifndef EMBED

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

#endif

#include "audio.h"

#include "mad.h"

#include "fsyst.h"

volatile int button;

//#define OR1K_SIM

#define AUDIO_DBG       0

#if AUDIO_DBG

extern unsigned short wave_dump[(0x40000/2)];

extern int wave_seg_index[0x10000];

extern int wave_seg_nb;

extern int wave_index;

#endif

#define SRAM_BASE       0x80000000

#define SUCCESS_CODE    0x11223344

#define REG32(x)        (*(volatile unsigned long *)(x))

#ifdef OR1K_SIM

#define BUTTON_STATE    (0)

#else

#define BUTTON_STATE    (!((*((volatile unsigned long *)0x40000000)) & 0x80000000))

#endif

void report1(unsigned long value)

{

        unsigned long spr = 0x1234;

        asm("l.mtspr\t\t%0,%1,0x0" : : "r" (spr), "r" (value));

        return;

}

/*

int test_button(void)

{

  if(BUTTON_STATE) {

    button = 1;

    return 0;

  }

  else {

    if(button == 1) {

      while(1) {

        int l = 0;

        int i,j,k;

        for(i = 0; i < 3; i++) {

          for(j = 0; j < 100000; j++)

            k = BUTTON_STATE;

          l += k;

        }

        if(l == 0) {

          button = 0;

          return 1;

        }

      }

    }

    else {

      button = 0;

      return 0;

    }

  }

  return 0;

}

*/

int test_button(void)

{

  if(BUTTON_STATE)

    while(1) {

      int l = 0;

      int i,j,k;

      for(i = 0; i < 3; i++) {

        for(j = 0; j < 100000; j++)

          k = BUTTON_STATE;

        l += k;

      }

      if(l == 0) {

        button = 0;

        return 1;

      }

    }

  return 0;

}

# ifdef EMBED

int main();

void c_reset()

{

        register unsigned long i asm("r5");

        register int longgggjump asm("r3");

        register unsigned long main_ofs asm("r4");

//      memcpy((void *)0x80000000, (void *)0, 0x1000);

/*              for (i=0x100; i < 0x13000; i+=4)

                  *(unsigned long *)(0x80000000+i) = *(unsigned long *)(0x0+i);

              main_ofs = (unsigned long)main;

              asm("l.movhi r3,0x8000");

              asm("l.add r3,r3,%0" : : "r" (main_ofs));

              asm("l.jr r3");

              asm("l.nop");

*/

              main(0,0);

}

# endif

/* Root file location.  */

unsigned char *root_file;

static int nchan = 0, speed = 0;

# ifndef EMBED

FILE *fo;

int output_s(unsigned char const *ptr, unsigned int len);

# endif

static void

output(struct mad_pcm *pcm)

{

  unsigned int nchannels;

# ifndef EMBED

  union audio_control control;

# endif

  mad_fixed_t *ch1, *ch2;

  nchannels = pcm->channels;

  if (nchannels != nchan || speed != pcm->samplerate)

    {

# ifndef EMBED

      control.command = AUDIO_COMMAND_CONFIG;

      control.config.channels = nchannels;

      control.config.speed    = pcm->samplerate;

      printf ("%i ", pcm->samplerate);

      if (audio_oss(&control) == -1)

        return;

# endif 

      nchan = nchannels;

      speed = pcm->samplerate;

    }

  ch1 = &pcm->samples[0][0];

  ch2 = &pcm->samples[1][0];

  if (nchan == 1)

    ch2 = ch1;

  {

    unsigned char data[MAX_NSAMPLES * 4 * 2];

    unsigned int len;

    len = audio_pcm_s16le(data, pcm->length, ch1, ch2);

# ifndef EMBED

    output_s(data, len);

# endif

  }

  return;

}

#ifdef EMBED

void report(unsigned long value)

{

        unsigned long spr = 0x1234;

        asm("l.mtspr\t\t%0,%1,0x0" : : "r" (spr), "r" (value));

        return;

}

#endif

struct mad_pcm pcm;

/* Generates beep of 32 samples with sampling frequency

   freq, vould = 0..31. */

static void genbeep (int freq, int volume)

{

  int o = MAD_F_ONE/256 * volume, i;

  pcm.length = 32;

  pcm.samplerate = freq;

  pcm.channels = 1;

  for (i = 0; i < 8; i++)

 {

    pcm.samples[0][i] = i * o;

//     report(i);

  }

  for (i = 0; i < 8; i++)

    pcm.samples[0][i+8] = (8 - i) * o;

  output (&pcm);

  for (i = 0; i < 16; i++)

    pcm.samples[0][16+i] = -pcm.samples[0][i];

  output (&pcm);

}

static void short_beep ()

{

  int i;

  for (i = 0; i < 5; i++)

    genbeep(44100, 8);

}

/* private message buffer */

struct buffer {

  unsigned char *start;

  unsigned long length;

};

/* 2. called when more input is needed; refill stream buffer */

static

enum mad_flow input(void *data,

                    struct mad_stream *stream)

{

  struct buffer *buffer = data;

  if (!buffer->length)

    return MAD_FLOW_STOP;

  mad_stream_buffer(stream, buffer->start, buffer->length);

  buffer->length = 0;

  return MAD_FLOW_CONTINUE;

}

/* 4. called to handle a decoding error */

static

enum mad_flow error(void *data,

                    struct mad_stream *stream,

                    struct mad_frame *frame)

{

#ifndef EMBED

  struct buffer *buffer = data;

  fprintf(stderr, "decoding error 0x%04x at byte offset %u\n",

          stream->error, stream->this_frame - buffer->start);

#endif

  return MAD_FLOW_STOP;

}

/* 5. put it all together */

static

int decode(unsigned char *start, unsigned long length)

{

  struct buffer buffer;

  struct mad_decoder decoder;

  int result = 0;

  buffer.start  = start;

  buffer.length = length;

  /* configure input, and error functions */

  mad_decoder_init(&decoder, &buffer,

                   input, error);

  /* start the decoder */

  result = mad_decoder_run(&decoder, MAD_DECODER_MODE_SYNC);

  mad_decoder_finish(&decoder);

  return result;

}

#ifndef EMBED

static void *init_flash (char *filename)

{

  struct stat f_stat;

  void *flash;

  FILE *f = fopen (filename, "rb");

  if (!f)

    return NULL;

  stat (filename, &f_stat);

  flash = malloc (f_stat.st_size);

  if (!flash)

    return NULL;

  if (fread (flash, 1, f_stat.st_size, f) != f_stat.st_size)

    return NULL;

  fclose (f);

  return flash;

}

#else

extern unsigned char flash_data[];

#endif

void __main() {}

int main(int argc, char *argv[])

{

  int i;

  int result;

#ifndef EMBED

  union audio_control control;

  if (argc != 2)

    {

      printf ("Usage: minimad image_file.mfs\n");

      return 1;

    }

  if (!(root_file = (char *) init_flash (argv[1])))

    {

      fprintf (stderr, "Error loading image file '%s'\n", argv[1]);

      return 2;

    }

  control.command   = AUDIO_COMMAND_INIT;

  control.init.path = NULL;

  if (audio_oss(&control) == -1) {

    printf("audio %s\n", audio_error);

    return 3;

  }

  fo = fopen ("audio.pcm", "wb+");

#else

  /* In EMBEDDED applications we have flash data linked.  */

  root_file = &flash_data[0];

#ifdef OR1K_SIM

  asm volatile ("l.mtspr r0,r0,0x0FFFD");

#endif

#endif  

  button = 0;

  for (i = 1;; i++) {

    struct file_struct *fs, *datat;

    fs = find_track_no (i, ROOT_FILE);

//    if (!fs) break;

    if(!fs) {

      i = 1;

      fs = find_track_no (i, ROOT_FILE);

    }

    datat = track_data (fs);

    short_beep();

# ifndef EMBED

    {

      unsigned u, v;

      u = swap(datat->length);

      v = swap(datat->data[0]);

      printf ("Track %u: %s\n", i, track_name (fs));

      printf ("%08x:%08x:%08x\n", datat->data[0], v, u);

    }

# endif

    result = decode((unsigned char *)&datat->data[0], swap(datat->length) - sizeof(struct file_struct) + sizeof (unsigned int));

    if(result != 1) {

      while(!test_button());

    }

  }

  short_beep();

#ifndef EMBED

  control.command = AUDIO_COMMAND_FINISH;

  if (audio_oss(&control) == -1) {

    printf("audio %s\n", audio_error);

    return 3;

  }

  free (root_file);

  printf ("Done.\n");

  fclose (fo);

#else

#ifdef OR1K_SIM

  asm volatile("l.mtspr r0,r0,0x0FFFF");

#endif

#endif

#if AUDIO_DBG

report1(wave_index);

report1(wave_seg_nb);

report1(wave_seg_index[10]);

report1(wave_dump[wave_seg_index[10]]);

report1(wave_seg_index[11]);

report1(wave_dump[wave_seg_index[11]]);

report1(wave_seg_index[12]);

report1(wave_dump[wave_seg_index[12]]);

#endif

while(1) {

                REG32(SRAM_BASE + 0x00) = (SUCCESS_CODE >> 0) & 0x000000ff;

                REG32(SRAM_BASE + 0x40) = (SUCCESS_CODE >> 8) & 0x000000ff;

                REG32(SRAM_BASE + 0x80) = (SUCCESS_CODE >> 16) & 0x000000ff;

                REG32(SRAM_BASE + 0xc0) = (SUCCESS_CODE >> 24) & 0x000000ff;

        }

  return 0;

}