[Libav-user] avformat_open_input with custom AVIOContext

[Louis M]

Hello everyone,
I am creating a library to put more than one file into one file (some
kind of package file). So, I need to use a custom AVIOContext. I try
the following code to test and the "avformat_open_input" give function
give me an "Invalid data found when processing input" error.

The Code:

#include <stdio.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>

int read_packet(void *opaque, uint8_t *buf, int buf_size){
	FILE *the_file = (FILE *) opaque;
	return(fread(buf,1,buf_size,the_file));
}


int64_t seek(void *opaque, int64_t offset, int whence){
	FILE *the_file = (FILE *) opaque;
	return(fseek ( the_file, offset, whence ));
}

int main(){
	AVFormatContext *input;
	AVIOContext * avio_context;
	unsigned char * bio_buffer;
	FILE *the_file;

	the_file=fopen("sound.flac","rb");
	input=avformat_alloc_context();
	bio_buffer=(unsigned char *)av_malloc(4092);
	avio_context=avio_alloc_context(bio_buffer,4092,0,the_file,&read_packet,NULL,&seek);
	input->pb=avio_context;
	if(!input->pb) {
		return 1;
	}
	int r=avformat_open_input(&input,"stream",NULL,NULL);
	if(r<0){
		char * error;
		error=malloc(64);
		av_strerror(r,error,64);
		printf("Error: %s\n",error);
		free(error);
		return 1;
	}
	avformat_free_context(input);
	av_free(avio_context);
	av_free(bio_buffer);
	fclose(the_file);
}


The "sound.flac" file is a standard flac file. Here is what the
"ffmpeg -i sound.flac" command line give me:

[flac @ 0x1c0a7a0] max_analyze_duration reached
Input #0, flac, from 'sound.flac':
  Duration: 00:00:15.31, bitrate: 342 kb/s
    Stream #0.0: Audio: flac, 44100 Hz, 1 channels, s16
At least one output file must be specified


So, if someone can help me out. I'm a stuck here.

Thanks in advance.

Louis M