68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
|
#pragma once
|
||
|
|
|
||
|
|
#include <string>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <iostream>
|
||
|
|
|
||
|
|
#include "lib_begin.h"
|
||
|
|
|
||
|
|
namespace cgv {
|
||
|
|
namespace media {
|
||
|
|
|
||
|
|
/// represents fourcc ids as used in the riff format to identify chunks
|
||
|
|
struct CGV_API fourcc
|
||
|
|
{
|
||
|
|
static unsigned make_id(const std::string& ascii);
|
||
|
|
/// store fourcc as 32 bit integer
|
||
|
|
unsigned id;
|
||
|
|
/// construct from unsigned integer
|
||
|
|
fourcc(unsigned _id = 0) : id(_id) {}
|
||
|
|
/// construct from string
|
||
|
|
fourcc(const std::string& s) : id(make_id(s)) {}
|
||
|
|
/// convert to string
|
||
|
|
std::string to_string() const;
|
||
|
|
/// compare with string
|
||
|
|
bool operator == (const std::string& s) const;
|
||
|
|
/// compare with string
|
||
|
|
bool operator != (const std::string& s) const;
|
||
|
|
};
|
||
|
|
|
||
|
|
/// stream out fourcc structure
|
||
|
|
extern CGV_API std::ostream& operator << (std::ostream& os, const fourcc& f);
|
||
|
|
|
||
|
|
/// callback handler passed to riff reader
|
||
|
|
struct CGV_API riff_handler
|
||
|
|
{
|
||
|
|
/// this is called when riff or list chunk is started, return whether to process list elements (default return is true)
|
||
|
|
virtual bool begin_list_chunk(fourcc id, unsigned size, fourcc hdr);
|
||
|
|
//! this is called before data of chunk is read, return whether to process chunk data (default return is true)
|
||
|
|
/*! If the chunk data should be stored in memory allocated by the handler, set \c data_ptr to this memory block
|
||
|
|
that must provide space for \c size bytes. If \c data_ptr is not set, the reader automatically allocates
|
||
|
|
a new data block, which is also deallocated by the reader after the corresponding call to \c process_chunk_data. */
|
||
|
|
virtual bool process_chunk_header(fourcc id, unsigned size, void*& data_ptr);
|
||
|
|
/// if \c process_chunk_header returned \c true, this callback is called to process chunk data
|
||
|
|
virtual void process_chunk_data(fourcc id, unsigned size, void* data_ptr);
|
||
|
|
/// called to mark the end of a list chunk
|
||
|
|
virtual void end_list_chunk(fourcc id, unsigned size, fourcc hdr);
|
||
|
|
};
|
||
|
|
|
||
|
|
/// reader class for riff files such as .ani or .avi
|
||
|
|
class CGV_API riff_reader
|
||
|
|
{
|
||
|
|
protected:
|
||
|
|
FILE* fp;
|
||
|
|
riff_handler* rh;
|
||
|
|
bool read_chunk_info(fourcc& f, unsigned& size);
|
||
|
|
bool read_chunk_list(unsigned size);
|
||
|
|
void close();
|
||
|
|
public:
|
||
|
|
/// construct from riff_handler
|
||
|
|
riff_reader(riff_handler* _rh);
|
||
|
|
/// read given file and generate callbacks to the riff_handler, return whether read was successful
|
||
|
|
bool read(const std::string& file_name);
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#include <cgv/config/lib_end.h>
|