Sign in to follow this  

Unity [Solved] Problem with fread( ) usage...

This topic is 4556 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

Since this topic seems to have shifted focus, I thought it might be more useful to post on this forum. What I'm trying to do is load a WAV file into memory so that I can play it back using DirectSound. To do this, I read in the header information for the file and then try to read in the sound data... which is where I fail. I've gone into fread( ) itself and looked at what it is doing and it seems to read only 6 bytes and then just gives up. When it requests the next segment from the hard disk, it seems to be receiving nothing. I know for a fact that the file is not at it's end, yet fread just quits. Here is the code for the loading of the sound file. It is based on the article here on Gamedev.net:
#include<stdlib.h>
#include<stdio.h>
#include<string.h>

SNDFILE *readWav(char *file_name)
{
 FILE *fp = NULL; 

 fp = fopen(file_name,"r");
 if (!fp) //Make sure the file was found
  return NULL;

 unsigned char id[4]; //four bytes to hold identifiers ('RIFF','WAVE','fmt ','data');
 unsigned long size; //32 bit value to hold file size
 unsigned long format_length;//Length of format header; Should be 16

 fread(id, sizeof(unsigned char), 4, fp); //read in first four bytes
 if (strncmp((const char *)id, "RIFF",4))
  return NULL;
 
 fread(&size, sizeof(unsigned long), 1, fp); //read in 32bit size value
 
 fread(id, sizeof(unsigned char), 4, fp); //read in 4 byte string
 if (strncmp((const char *)id,"WAVE",4))
  return NULL;

 fread(id, sizeof(unsigned char), 4, fp); //read in 4 bytes "fmt "; 
 if(strncmp((const char *)id, "fmt ",4))
  return NULL;

 SNDFILE *tmp = (SNDFILE *) malloc(sizeof(SNDFILE));

 fread(&format_length, sizeof(unsigned long),1,fp); //Should be 16
 fread(&tmp->wfrmt.wFormatTag, sizeof(short), 1, fp);//Should always be WAVE_FORMAT_PCM
 fread(&tmp->wfrmt.nChannels, sizeof(short),1,fp); //1 mono, 2 stereo
 fread(&tmp->wfrmt.nSamplesPerSec, sizeof(unsigned long), 1, fp); //like 44100, 22050, etc...
 fread(&tmp->wfrmt.nAvgBytesPerSec, sizeof(unsigned long), 1, fp); //Average Bytes per second
 fread(&tmp->wfrmt.nBlockAlign, sizeof(short), 1, fp); //nChannels * BytesPerSample
 fread(&tmp->wfrmt.wBitsPerSample, sizeof(short), 1, fp); //8 bit or 16 bit file?
 tmp->wfrmt.cbSize = 0;

 fread(id, sizeof(unsigned char), 4, fp); //read in identifier 'data'
 if(strncmp((const char *)id, "data",4))
 {
  free(tmp);
  return NULL;
 }

 int bytes_read; // Used to check how many bytes fread read
 fread(&tmp->size, sizeof(unsigned long), 1, fp); //how many bytes of sound data do we have
 tmp->buffer = (unsigned char *) malloc (sizeof(unsigned char) * tmp->size); //set aside sound buffer space
 //for(int i=0; i<(int)tmp->size; i++)
  //tmp->buffer[i] = (unsigned char) rand()%256;
  //tmp->buffer[i]=fgetc(fp);

/*!!!FAILURE ON NEXT STEP!!!*/
 bytes_read = fread(tmp->buffer, sizeof(unsigned char), tmp->size, fp); //read in our whole sound data chunk
 fclose(fp);

 FILE *out; // Test file to see what the buffer read
 out = fopen("Out.txt","w+");
 fwrite(tmp->buffer,sizeof(unsigned char),tmp->size,out);
 fclose(out); 
 return tmp;

}





And here is the definition of SNDFILE:
typedef struct{
	WAVEFORMATEX wfrmt;
	unsigned long size;
	unsigned char *buffer;
	}SNDFILE;





Thanks for reading :)

Share this post


Link to post
Share on other sites
After the first 6 bytes? so half way through:

fread(&size, sizeof(unsigned long), 1, fp); //read in 32bit size value
Also, define "quit" - does your program crash or terminate? or does fread just return and you get invalid data? or something else?

Share this post


Link to post
Share on other sites
Guest Anonymous Poster
Might not fix your problem, but you should open non-text files as "binary" to avoid OS incompatibilities (which caused me a huge amount of trouble until I figured out the cause). Open as "rb" instead of "r".

Share this post


Link to post
Share on other sites
I've added a comment at the point at which it fails. It reads all of the header information just fine. The failure takes place on the last fread (i.e. when I try to read in the data segment).

Sorry about not clarifying :P

Share this post


Link to post
Share on other sites
Quote:
Original post by Anonymous Poster
Might not fix your problem, but you should open non-text files as "binary" to avoid OS incompatibilities (which caused me a huge amount of trouble until I figured out the cause). Open as "rb" instead of "r".


If I knew who you where, I'd give you a hug (and I'd rate you up)... :P

That was indeed it the problem. :D I'd never even heard about opening up in binary mode. I guess you learn something new each day...

Share this post


Link to post
Share on other sites

This topic is 4556 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this  

  • Forum Statistics

    • Total Topics
      628658
    • Total Posts
      2984070
  • Similar Content

    • By arash khalaqhdoust
      hey guys i hope you doing all well. last night i released my first game in google app store, i really appreciate you guys  to download it. and share your reviews about it
      the idea of game comes from mini hackgame of Bioshock.
       link of download:
      https://play.google.com/store/apps/details?id=com.RVBinary.piperist
      many thanks
    • By ForgedInteractive
      Who We Are
      We are Forged Interactive, a small team of like-minded game developers with the sole purpose of making games we love! Currently, we're progressing very quickly with our first project and there are plenty of opportunities and work for new interested programmers. With this project, our development platform is Unity 5.5.2 and C# as our behavioral language. Since this project is our first release, the game itself is a smaller project though progress is moving quickly. We are looking to finalize the current project and get started on future projects in the near future and are expanding our team to do so.
       
      Who We Are Looking For:
      Programmer Level Designer  
      About the Game
      Ours is the tale of two siblings, thrown into a world of chaos. Living in the shadow of their parents' heroic deeds and their Uncle's colorful military career, Finn and Atia are about to become the next force to shape our world. How will you rise through the ranks of Hereilla and what will be your legacy? Once defeated your enemies turn coat and join you in your adventures. Players can enjoy a range of troops and abilities based on their gameplay style which become more important as maps introduce more challenging terrain, enemies and bosses. Strong orc knights, dangerous shamans, and even a dragon are out on the prowl. Knowing when to fight and when to run, and how to manage your army is essential. Your actions alone decide the fate of this world.
       
      Previous Work by Team
      Although we are working towards our first game as Forged Interactive, our team members themselves have worked on titles including and not limited to:
      Final Fantasy Kingsglaive FIFA 2017 Xcom 2 Civilization  
      What do we expect?
      Reference work or portfolio. Examples what have you already done and what projects you have worked on academic or otherwise. The ability to commit to the project on a regular basis. If you are going on a two-week trip, we don't mind, but it would be good if you could commit 10+ hours to the project each week. Willingness to work with a royalty based compensation model, you will be paid when the game launches. Openness to learning new tools and techniques
       
      What can we offer?
      Continuous support and availability from our side. You have the ability to give design input, and creative say in the development of the game. Shown in credits on websites, in-game and more. Insight and contacts from within the Industry.
       
      Contact
      If you are interested in knowing more or joining, please email or PM us on Skype. A member of our management team will reply to you within 48 hours.
       
      E-mail: Recruitment@ForgedInteractive.com
      Skype: ForgedInteractive
       
      Regards,
      David, Colin and Joseph
       
      Follow us on:
      Facebook: https://www.facebook.com/ForgedInteractive/
      Twitter: @ForgedInteract
      Youtube: https://www.youtube.com/channel/UCpK3zhq5ToOeDpdI0Eik-Ug?view_as=subscriber
      Reddit: www.reddit.com/user/Forged_Interactive

    • By dell96
      I'm trying to make my first project but I'm stuck i don't know how to make my crate to start to spawn again when i hit the start button after i die.
      hoping someone can help!!!
      Crate.cs
      CrateSpawn.cs
      Cratework.cs
      GameController.cs
      GameManager.cs
  • Popular Now