cddb.c

自己移植的linux下的流媒体播放器原代码,支持mms协议,支持ftp和http协议.

/*
 * CDDB HTTP protocol 
 * by Bertrand Baudet <[e-mail]>
 * (C) 2002, MPlayer team.
 *
 * Implementation follow the freedb.howto1.06.txt specification
 * from http://freedb.freedb.org
 * 
 * discid computation by Jeremy D. Zawodny
 *	 Copyright (c) 1998-2000 Jeremy D. Zawodny <[e-mail]>
 *	 Code release under GPL
 *
 */

#include "config.h"

#if defined(HAVE_CDDA) && defined(MPLAYER_NETWORK)

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <stdarg.h>
#include <errno.h>
#include <netdb.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>

#if defined(__linux__)
	#include <linux/cdrom.h>
#elif defined(__FreeBSD__) || defined(__bsdi__) || defined(__NetBSD__) || defined(__OpenBSD__)
	#include <sys/cdio.h>
#endif

#include "cdd.h"
#include "../version.h"
#include "stream.h"
#include "network.h"

#define DEFAULT_FREEDB_SERVER	"freedb.freedb.org"
#define DEFAULT_CACHE_DIR	"/.cddb/"

stream_t* open_cdda(char *dev, char *track);

static cd_toc_t cdtoc[100];

#if defined(__linux__)
int 
read_toc(const char *dev) {
	int drive;
	struct cdrom_tochdr tochdr;
	struct cdrom_tocentry tocentry;
	int i;

	drive = open(dev, O_RDONLY | O_NONBLOCK);
	if( drive<0 ) {
		return drive;
	}
	
	ioctl(drive, CDROMREADTOCHDR, &tochdr);
	for (i = tochdr.cdth_trk0; i <= tochdr.cdth_trk1; i++) {
		tocentry.cdte_track = i;
		tocentry.cdte_format = CDROM_MSF;
		ioctl(drive, CDROMREADTOCENTRY, &tocentry);
		cdtoc[i-1].min = tocentry.cdte_addr.msf.minute;
		cdtoc[i-1].sec = tocentry.cdte_addr.msf.second;
		cdtoc[i-1].frame = tocentry.cdte_addr.msf.frame;
		cdtoc[i-1].frame += cdtoc[i-1].min*60*75;
		cdtoc[i-1].frame += cdtoc[i-1].sec*75;
	}
	tocentry.cdte_track = 0xAA;
	tocentry.cdte_format = CDROM_MSF;
	ioctl(drive, CDROMREADTOCENTRY, &tocentry);
	cdtoc[tochdr.cdth_trk1].min = tocentry.cdte_addr.msf.minute;
	cdtoc[tochdr.cdth_trk1].sec = tocentry.cdte_addr.msf.second;
	cdtoc[tochdr.cdth_trk1].frame = tocentry.cdte_addr.msf.frame;
	cdtoc[tochdr.cdth_trk1].frame += cdtoc[tochdr.cdth_trk1].min*60*75;
	cdtoc[tochdr.cdth_trk1].frame += cdtoc[tochdr.cdth_trk1].sec*75;
	close(drive);
	return tochdr.cdth_trk1;
}

#elif defined(__FreeBSD__) || defined(__bsdi__)
int 
read_toc(const char *dev) {
	int drive;
	struct ioc_toc_header tochdr;
	struct ioc_read_toc_single_entry tocentry;
	int i;

	drive = open(dev, O_RDONLY | O_NONBLOCK);
	if( drive<0 ) {
		return drive;
	}

	ioctl(drive, CDIOREADTOCHEADER, &tochdr);
	for (i = tochdr.starting_track; i <= tochdr.ending_track; i++) {
		tocentry.track = i;
		tocentry.address_format = CD_MSF_FORMAT;
		ioctl(drive, CDIOREADTOCENTRY, &tocentry);
		cdtoc[i-1].min = tocentry.entry.addr.msf.minute;
		cdtoc[i-1].sec = tocentry.entry.addr.msf.second;
		cdtoc[i-1].frame = tocentry.entry.addr.msf.frame;
		cdtoc[i-1].frame += cdtoc[i-1].min*60*75;
		cdtoc[i-1].frame += cdtoc[i-1].sec*75;
	}
	tocentry.track = 0xAA;
	tocentry.address_format = CD_MSF_FORMAT;
	ioctl(drive, CDIOREADTOCENTRY, &tocentry);
	cdtoc[tochdr.ending_track].min = tocentry.entry.addr.msf.minute;
	cdtoc[tochdr.ending_track].sec = tocentry.entry.addr.msf.second;
	cdtoc[tochdr.ending_track].frame = tocentry.entry.addr.msf.frame;
	cdtoc[tochdr.ending_track].frame += cdtoc[tochdr.ending_track].min*60*75;
	cdtoc[tochdr.ending_track].frame += cdtoc[tochdr.ending_track].sec*75;
	close(drive);
	return tochdr.ending_track;
}

#elif defined(__NetBSD__) || defined(__OpenBSD__)
int
read_toc(const char *dev) {
	int drive;
	struct ioc_toc_header tochdr;
	struct ioc_read_toc_entry tocentry;
	int i;
	struct cd_toc_entry toc_buffer;

	drive = open(dev, O_RDONLY | O_NONBLOCK);
	if( drive<0 ) {
		return drive;
	}

	ioctl(drive, CDIOREADTOCHEADER, &tochdr);
	for (i = tochdr.starting_track; i <= tochdr.ending_track; i++) {
		tocentry.starting_track = i;
		tocentry.address_format = CD_MSF_FORMAT;
		tocentry.data = &toc_buffer;
		tocentry.data_len = sizeof(toc_buffer);
		ioctl(drive, CDIOREADTOCENTRYS, &tocentry);
		cdtoc[i-1].min = toc_buffer.addr.msf.minute;
		cdtoc[i-1].sec = toc_buffer.addr.msf.second;
		cdtoc[i-1].frame = toc_buffer.addr.msf.frame;
		cdtoc[i-1].frame += cdtoc[i-1].min*60*75;
		cdtoc[i-1].frame += cdtoc[i-1].sec*75;
	}
	tocentry.starting_track = 0xAA;
	tocentry.address_format = CD_MSF_FORMAT;
	ioctl(drive, CDIOREADTOCENTRYS, &tocentry);
	cdtoc[tochdr.ending_track].min = toc_buffer.addr.msf.minute;
	cdtoc[tochdr.ending_track].sec = toc_buffer.addr.msf.second;
	cdtoc[tochdr.ending_track].frame = toc_buffer.addr.msf.frame;
	cdtoc[tochdr.ending_track].frame += cdtoc[tochdr.ending_track].min*60*75;
	cdtoc[tochdr.ending_track].frame += cdtoc[tochdr.ending_track].sec*75;
	close(drive);
	return tochdr.ending_track;
}
#endif

unsigned int 
cddb_sum(int n) {
	unsigned int ret;

	ret = 0;
	while (n > 0) {
		ret += (n % 10);
		n /= 10;
	}
	return ret;
}

unsigned long 
cddb_discid(int tot_trks) {
	unsigned int i, t = 0, n = 0;

	i = 0;
	while (i < (unsigned int)tot_trks) {
		n = n + cddb_sum((cdtoc[i].min * 60) + cdtoc[i].sec);
		i++;
	}
	t = ((cdtoc[tot_trks].min * 60) + cdtoc[tot_trks].sec) -
		((cdtoc[0].min * 60) + cdtoc[0].sec);
	return ((n % 0xff) << 24 | t << 8 | tot_trks);
}



int
cddb_http_request(char *command, int (*reply_parser)(HTTP_header_t*,cddb_data_t*), cddb_data_t *cddb_data) {
	char request[4096];
	int fd, ret = 0;
	URL_t *url;
	HTTP_header_t *http_hdr;
	
	if( reply_parser==NULL || command==NULL || cddb_data==NULL ) return -1;
	
	sprintf( request, "http://%s/~cddb/cddb.cgi?cmd=%s%s&proto=%d", cddb_data->freedb_server, command, cddb_data->cddb_hello, cddb_data->freedb_proto_level );
	printf("Request[%s]\n", request );

	url = url_new(request);
	if( url==NULL ) {
		printf("Not a valid URL\n");
		return -1;
	}
	
	fd = http_send_request(url,0);
	if( fd<0 ) {
		printf("failed to send the http request\n");
		return -1;
	}

	http_hdr = http_read_response( fd );
	if( http_hdr==NULL ) {
		printf("Failed to read the http response\n");
		return -1;
	}

	http_debug_hdr(http_hdr);
	printf("body=[%s]\n", http_hdr->body );

	switch(http_hdr->status_code) {
		case 200:
			ret = reply_parser(http_hdr, cddb_data);
			break;
		case 400:
			printf("Not Found\n");
			break;
		default:
			printf("Unknown Error code\n");
	}

	http_free( http_hdr );
	url_free( url );
	
	return ret;
}

int
cddb_read_cache(cddb_data_t *cddb_data) {
	char file_name[100];
	struct stat stats;
	int file_fd, ret;
	size_t file_size;

	if( cddb_data==NULL || cddb_data->cache_dir==NULL ) return -1;
	
	sprintf( file_name, "%s%08lx", cddb_data->cache_dir, cddb_data->disc_id);
	
	file_fd = open(file_name, O_RDONLY);
	if( file_fd<0 ) {
		printf("No cache found\n");
		return -1;
	}

	ret = fstat( file_fd, &stats );
	if( ret<0 ) {
		perror("fstat");
		file_size = 4096;
	} else {
		file_size = stats.st_size;
	}
	
	cddb_data->xmcd_file = (char*)malloc(file_size);
	if( cddb_data->xmcd_file==NULL ) {
		printf("Memory allocation failed\n");
		close(file_fd);
		return -1;
	}
	cddb_data->xmcd_file_size = read(file_fd, cddb_data->xmcd_file, file_size);
	if( cddb_data->xmcd_file_size!=file_size ) {
		printf("Not all the xmcd file has been read\n");
		close(file_fd);
		return -1;
	}
	
	close(file_fd);
	
	return 0;
}

int
cddb_write_cache(cddb_data_t *cddb_data) {
	// We have the file, save it for cache.
	struct stat file_stat;
	char file_name[100];
	int file_fd, ret;
	int wrote=0;

	if( cddb_data==NULL || cddb_data->cache_dir==NULL ) return -1;

	// Check if the CDDB cache dir exist
	ret = stat( cddb_data->cache_dir, &file_stat );
	if( ret<0 ) {
		// Directory not present, create it.
		ret = mkdir( cddb_data->cache_dir, 0755 );
		if( ret<0 ) {
			perror("mkdir");
			printf("Failed to create directory %s\n", cddb_data->cache_dir );
			return -1;
		}
	}
	
	sprintf( file_name, "%s%08lx", cddb_data->cache_dir, cddb_data->disc_id );
	
	file_fd = creat(file_name, S_IREAD|S_IWRITE);
	if( file_fd<0 ) {
		perror("create");
		return -1;
	}
	
	wrote = write(file_fd, cddb_data->xmcd_file, cddb_data->xmcd_file_size);
	if( wrote<0 ) {
		perror("write");
		close(file_fd);
		return -1;
	}
	if( (unsigned int)wrote!=cddb_data->xmcd_file_size ) {
		printf("Not all the xmcd file has been written\n");
		close(file_fd);
		return -1;
	}
	
	close(file_fd);

	return 0;
}

int
cddb_read_parse(HTTP_header_t *http_hdr, cddb_data_t *cddb_data) {
	unsigned long disc_id;
	char category[100];
	char *ptr=NULL, *ptr2=NULL;
	int ret, status;

	if( http_hdr==NULL || cddb_data==NULL ) return -1;
	
	ret = sscanf( http_hdr->body, "%d ", &status);
	if( ret!=1 ) {
		printf("Parse error\n");
		return -1;
	}

	switch(status) {
		case 210:
			ret = sscanf( http_hdr->body, "%d %s %08lx", &status, category, &disc_id);
			if( ret!=3 ) {
				printf("Parse error\n");
				return -1;
			}
			// Check if it's a xmcd database file
			ptr = strstr(http_hdr->body, "# xmcd");
			if( ptr==NULL ) {
				printf("Invalid xmcd database file returned\n");
				return -1;
			}
			// Ok found the beginning of the file
			// look for the end
			ptr2 = strstr(ptr, "\r\n.\r\n");
			if( ptr2==NULL ) {
				ptr2 = strstr(ptr, "\n.\n");
				if( ptr2==NULL ) {
					printf("Unable to find '.'\n");
					ptr2=ptr+strlen(ptr); //return -1;
				}
			}
			// Ok found the end
			// do a sanity check
			if( http_hdr->body_size<(unsigned int)(ptr2-ptr) ) {
				printf("Unexpected fix me\n");
				return -1;
			}
			cddb_data->xmcd_file = ptr;
			cddb_data->xmcd_file_size = ptr2-ptr+2;
			cddb_data->xmcd_file[cddb_data->xmcd_file_size] = '\0';
			// Avoid the http_free function to free the xmcd file...save a mempcy...
			http_hdr->body = NULL;
			http_hdr->body_size = 0;
			return cddb_write_cache(cddb_data);
		default:
			printf("Unhandled code\n");
	}
	return 0;
}

int
cddb_request_titles(cddb_data_t *cddb_data) {
	char command[1024];
	sprintf( command, "cddb+read+%s+%08lx", cddb_data->category, cddb_data->disc_id);
	return cddb_http_request(command, cddb_read_parse, cddb_data); 
}