shithub: libtags

ref: d8185e7273233384dcf32da043c28446082df1d2
dir: /src/tags.c/

#include "tagspriv.h"

typedef struct Getter Getter;

struct Getter
{
	int (*f)(Tagctx *ctx);
	const char *ext;
	int extlen;
	int format;
};

extern int tagvorbis(Tagctx *ctx);
extern int tagflac(Tagctx *ctx);
extern int tagid3v2(Tagctx *ctx);
extern int tagid3v1(Tagctx *ctx);
extern int tagm4a(Tagctx *ctx);

static const Getter g[] =
{
	{tagid3v2, ".mp3", 4, Fmp3},
	{tagid3v1, ".mp3", 4, Fmp3},
	{tagvorbis, ".ogg", 4, Fogg},
	{tagflac, ".flac", 5, Fflac},
	{tagm4a, ".m4a", 4, Fm4a},
};

void
tagscallcb(Tagctx *ctx, int type, const char *s, int offset, int size, Tagread f)
{
	ctx->found |= 1<<type;
	ctx->tag(ctx, type, s, offset, size, f);
	ctx->num++;
}

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

	/* enough for having an extension */
	len = 0;
	if(ctx->filename != nil && (len = strlen(ctx->filename)) < 5)
		return -1;
	ctx->channels = ctx->samplerate = ctx->bitrate = ctx->duration = 0;
	ctx->found = 0;
	ctx->format = -1;
	res = -1;
	for(i = 0; i < (int)(sizeof(g)/sizeof(g[0])); i++){
		if(ctx->filename == nil || memcmp(&ctx->filename[len-g[i].extlen], g[i].ext, g[i].extlen) == 0){
			ctx->num = 0;
			if(g[i].f(ctx) == 0 && ctx->num > 0){
				res = 0;
				ctx->format = g[i].format;
			}
			ctx->seek(ctx, 0, 0);
		}
	}

	return res;
}