shithub: libtags

ref: 173b32f09bc04f114dc22bdfd0315402667c5fa7
dir: /tags.c/

#include "tagspriv.h"

typedef struct Getter Getter;

struct Getter
{
	int (*f)(Tagctx *ctx);
	int format;
};

extern int tagflac(Tagctx *ctx);
extern int tagid3v1(Tagctx *ctx);
extern int tagid3v2(Tagctx *ctx);
extern int tagit(Tagctx *ctx);
extern int tagm4a(Tagctx *ctx);
extern int tagopus(Tagctx *ctx);
extern int tags3m(Tagctx *ctx);
extern int tagvorbis(Tagctx *ctx);
extern int tagwav(Tagctx *ctx);
extern int tagxm(Tagctx *ctx);
extern int tagmod(Tagctx *ctx);

static const Getter g[] =
{
	{tagid3v2, Fmp3},
	{tagid3v1, Fmp3},
	{tagvorbis, Fogg},
	{tagflac, Fflac},
	{tagm4a, Fm4a},
	{tagopus, Fopus},
	{tagwav, Fwav},
	{tagit, Fit},
	{tagxm, Fxm},
	{tags3m, Fs3m},
	{tagmod, Fmod},
};

void
tagscallcb(Tagctx *ctx, int type, const char *k, char *s, int offset, int size, Tagread f)
{
	char *e;

	if(f == nil && size == 0){
		while(*s <= ' ' && *s)
			s++;
		e = s + strlen(s);
		while(e != s && e[-1] <= ' ')
			e--;
		*e = 0;
	}
	if(type != Tunknown){
		ctx->found |= 1<<type;
		ctx->num++;
	}
	if(*s)
		ctx->tag(ctx, type, k, s, offset, size, f);
}

int
tagsget(Tagctx *ctx)
{
	int i, res;

	ctx->channels = ctx->samplerate = ctx->bitrate = ctx->duration = 0;
	ctx->found = 0;
	ctx->format = Funknown;
	res = -1;
	for(i = 0; i < (int)(sizeof(g)/sizeof(g[0])); i++){
		ctx->num = 0;
		if(g[i].f(ctx) == 0){
			if(ctx->num > 0)
				res = 0;
			ctx->format = g[i].format;
		}
		ctx->seek(ctx, 0, 0);
	}

	return res;
}