多媒体

开发平台：
Unix_Linux

minf.c：源码内容
							#include "quicktime.h"
int quicktime_minf_init(quicktime_minf_t *minf)
{
	minf->is_video = minf->is_audio = 0;
	quicktime_vmhd_init(&(minf->vmhd));
	quicktime_smhd_init(&(minf->smhd));
	quicktime_hdlr_init(&(minf->hdlr));
	quicktime_dinf_init(&(minf->dinf));
	quicktime_stbl_init(&(minf->stbl));
}
int quicktime_minf_init_video(quicktime_t *file, 
								quicktime_minf_t *minf, 
								int frame_w,
								int frame_h, 
								float frame_rate,
								char *compressor)
{
	minf->is_video = 1;
	quicktime_vmhd_init_video(file, &(minf->vmhd), frame_w, frame_h, frame_rate);
	quicktime_stbl_init_video(file, &(minf->stbl), frame_w, frame_h, frame_rate, compressor);
	quicktime_hdlr_init_data(&(minf->hdlr));
	quicktime_dinf_init_all(&(minf->dinf));
}
int quicktime_minf_init_audio(quicktime_t *file, 
							quicktime_minf_t *minf, 
							int channels, 
							int sample_rate, 
							int bits, 
							char *compressor)
{
	minf->is_audio = 1;
// smhd doesn't store anything worth initializing
	quicktime_stbl_init_audio(file, &(minf->stbl), channels, sample_rate, bits, compressor);
	quicktime_hdlr_init_data(&(minf->hdlr));
	quicktime_dinf_init_all(&(minf->dinf));
}
int quicktime_minf_delete(quicktime_minf_t *minf)
{
	quicktime_vmhd_delete(&(minf->vmhd));
	quicktime_smhd_delete(&(minf->smhd));
	quicktime_dinf_delete(&(minf->dinf));
	quicktime_stbl_delete(&(minf->stbl));
	quicktime_hdlr_delete(&(minf->hdlr));
}
int quicktime_minf_dump(quicktime_minf_t *minf)
{
	printf("   media infon");
	printf("    is_audio %dn", minf->is_audio);
	printf("    is_video %dn", minf->is_video);
	if(minf->is_audio) quicktime_smhd_dump(&(minf->smhd));
	if(minf->is_video) quicktime_vmhd_dump(&(minf->vmhd));
	quicktime_hdlr_dump(&(minf->hdlr));
	quicktime_dinf_dump(&(minf->dinf));
	quicktime_stbl_dump(minf, &(minf->stbl));
}
int quicktime_read_minf(quicktime_t *file, quicktime_minf_t *minf, quicktime_atom_t *parent_atom)
{
	quicktime_atom_t leaf_atom;
	do
	{
		quicktime_atom_read_header(file->stream, &leaf_atom);
// mandatory
		if(quicktime_atom_is(&leaf_atom, "vmhd"))
			{ minf->is_video = 1; quicktime_read_vmhd(file, &(minf->vmhd)); }
		else
		if(quicktime_atom_is(&leaf_atom, "smhd"))
			{ minf->is_audio = 1; quicktime_read_smhd(file, &(minf->smhd)); }
		else
		if(quicktime_atom_is(&leaf_atom, "hdlr"))
			{ quicktime_read_hdlr(file, &(minf->hdlr)); }
		else
		if(quicktime_atom_is(&leaf_atom, "dinf"))
			{ quicktime_read_dinf(file, &(minf->dinf), &leaf_atom); }
		else
		if(quicktime_atom_is(&leaf_atom, "stbl"))
			{ quicktime_read_stbl(file, minf, &(minf->stbl), &leaf_atom); }
		else
			quicktime_atom_skip(file, &leaf_atom);
	}while(quicktime_position(file) < parent_atom->end);
	return 0;
}
int quicktime_write_minf(quicktime_t *file, quicktime_minf_t *minf)
{
	quicktime_atom_t atom;
	quicktime_atom_write_header(file, &atom, "minf");
	if(minf->is_video) quicktime_write_vmhd(file, &(minf->vmhd));
	if(minf->is_audio) quicktime_write_smhd(file, &(minf->smhd));
	quicktime_write_hdlr(file, &(minf->hdlr));
	quicktime_write_dinf(file, &(minf->dinf));
	quicktime_write_stbl(file, minf, &(minf->stbl));
	quicktime_atom_write_footer(file, &atom);
}

						