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-rw-r--r--apps/metadata.c223
1 files changed, 221 insertions, 2 deletions
diff --git a/apps/metadata.c b/apps/metadata.c
index f59917ceb8..6ba2331d26 100644
--- a/apps/metadata.c
+++ b/apps/metadata.c
@@ -91,9 +91,14 @@ const long wavpack_sample_rates [] = { 6000, 8000, 9600, 11025, 12000, 16000,
static bool get_apetag_info (struct mp3entry *entry, int fd);
+static bool get_vorbis_comments (struct mp3entry *entry, int fd);
+
+static void little_endian_to_native (void *data, char *format);
+
bool get_metadata(struct track_info* track, int fd, const char* trackname,
bool v1first) {
unsigned long totalsamples,bytespersample,channels,bitspersample,numbytes;
+ unsigned long serialno=0, last_serialno=0;
int bytesperframe;
unsigned char* buf;
int i,j,eof;
@@ -259,13 +264,29 @@ bool get_metadata(struct track_info* track, int fd, const char* trackname,
return(false);
}
+ /* We need to ensure the serial number from this page is the
+ * same as the one from the last page (since we only support
+ * a single bitstream).
+ */
+ serialno = buf[14]|(buf[15]<<8)|(buf[16]<<16)|(buf[17]<<24);
+
/* Ogg stores integers in little-endian format. */
track->id3.filesize=filesize(fd);
track->id3.frequency=buf[40]|(buf[41]<<8)|(buf[42]<<16)|(buf[43]<<24);
channels=buf[39];
+ if ( !get_vorbis_comments(&(track->id3), fd) ) {
+ logf("get_vorbis_comments failed");
+ return(false);
+ }
+
+ /* Set id3 genre to something bogus, otherwise vorbis tracks
+ * without genre tags will show up as 'Blues'
+ */
+ track->id3.genre=255;
+
/* We now need to search for the last page in the file - identified by
- by ('O','g','g','S',0) and retrieve totalsamples */
+ by ('O','g','g','S',0) and retrieve totalsamples */
lseek(fd, -32*1024, SEEK_END);
eof=0;
@@ -283,8 +304,9 @@ bool get_metadata(struct track_info* track, int fd, const char* trackname,
i=0;
while (i < (j-5)) {
if (memcmp(&buf[i],"OggS",5)==0) {
- if (i < (j-10)) {
+ if (i < (j-17)) {
totalsamples=(buf[i+6])|(buf[i+7]<<8)|(buf[i+8]<<16)|(buf[i+9]<<24);
+ last_serialno=(buf[i+14])|(buf[i+15]<<8)|(buf[i+16]<<16)|(buf[i+17]<<24);
j=0; /* We can discard the rest of the buffer */
} else {
break;
@@ -300,7 +322,18 @@ bool get_metadata(struct track_info* track, int fd, const char* trackname,
j=0;
}
}
+
+ /* This file has mutiple vorbis bitstreams (or is corrupt) */
+ /* FIXME we should display an error here */
+ if (serialno != last_serialno) {
+ track->taginfo_ready=false;
+ logf("serialno mismatch");
+ logf("%ld", serialno);
+ logf("%ld", last_serialno);
+ return false;
+ }
+ track->id3.samples=totalsamples;
track->id3.length=(totalsamples/track->id3.frequency)*1000;
/* The following calculation should use datasize, not filesize (i.e. exclude comments etc) */
@@ -712,3 +745,189 @@ static void UTF8ToAnsi (unsigned char *pUTF8)
*pAnsi = 0;
}
+/* This function extracts the information stored in the Vorbis comment header
+ * and stores it in id3v2buf of the current track. Currently the combined
+ * lengths of title, genre, album, and artist must be no longer than 296 bytes
+ * (the remaining 4 bytes are the null bytes at the end of the strings). This
+ * is wrong, since vorbis comments can be up to 2^32 - 1 bytes long. In
+ * practice I don't think this limitation will cause a problem.
+ *
+ * According to the docs, a vorbis bitstream *must* have a comment packet even
+ * if that packet is empty. Therefore if this function returns false the
+ * bitstream is corrupt and shouldn't be used.
+ *
+ * Additionally, vorbis comments *may* take up more than one Ogg page, and this
+ * only looks at the first page of comments.
+ */
+static bool get_vorbis_comments (struct mp3entry *entry, int fd)
+{
+ int vendor_length;
+ int comment_count;
+ int comment_length;
+ int i = 0;
+ unsigned char temp[300];
+ int buffer_remaining = sizeof(entry->id3v2buf);
+ char *buffer = entry->id3v2buf;
+ char **p = NULL;
+ int segments;
+ int packet_remaining = 0;
+
+ /* Comments are in second Ogg page */
+ if ( lseek(fd, 58, SEEK_SET) < 0 ) {
+ return false;
+ }
+
+ /* Minimum header length for Ogg pages is 27 */
+ if (read(fd, temp, 27) < 27) {
+ return false;
+ }
+
+ if (memcmp(temp,"OggS",4)!=0) {
+ logf("1: Not an Ogg Vorbis file");
+ return(false);
+ }
+
+ segments=temp[26];
+ /* read in segment table */
+ if (read(fd, temp, segments) < segments) {
+ return false;
+ }
+
+ /* The second packet in a vorbis stream is the comment packet. It *may*
+ * extend beyond the second page, but usually does not. Here we find the
+ * length of the comment packet (or the rest of the page if the comment
+ * packet extends to the third page).
+ */
+ for (i = 0; i < segments; i++) {
+ packet_remaining += temp[i];
+ /* The last segment of a packet is always < 255 bytes */
+ if (temp[i] < 255) {
+ break;
+ }
+ }
+
+ /* Now read in packet header (type and id string) */
+ if(read(fd, temp, 7) < 7) {
+ return false;
+ }
+
+ /* The first byte of a packet is the packet type; comment packets are
+ * type 3.
+ */
+ if ((temp[0] != 3) || (memcmp(temp + 1,"vorbis",6)!=0)) {
+ logf("Not a vorbis comment packet");
+ return false;
+ }
+
+ packet_remaining -= 7;
+
+
+ /* We've read in all header info, now start reading comments */
+
+ if (read(fd, &vendor_length, 4) < 4) {
+ return false;
+ }
+ little_endian_to_native(&vendor_length, "L");
+ lseek(fd, vendor_length, SEEK_CUR);
+
+ if (read(fd, &comment_count, 4) < 4) {
+ return false;
+ }
+ little_endian_to_native(&comment_count, "L");
+ packet_remaining -= (vendor_length + 8);
+ if ( packet_remaining <= 0 ) {
+ return true;
+ }
+
+ for ( i = 0; i < comment_count; i++ ) {
+ int name_length = 0;
+
+ if (read(fd, &comment_length, 4) < 4) {
+ return false;
+ }
+
+ little_endian_to_native(&comment_length, "L");
+
+ /* Quit if we've passed the end of the page */
+ packet_remaining -= (comment_length + 4);
+ if ( packet_remaining <= 0 ) {
+ return true;
+ }
+
+ /* Skip comment if it won't fit in buffer */
+ if ( (unsigned int)comment_length >= sizeof(temp) ) {
+ lseek(fd, comment_length, SEEK_CUR);
+ continue;
+ }
+
+ if ( read(fd, temp, comment_length) < comment_length ) {
+ return false;
+ }
+
+ temp[comment_length] = '\0';
+ UTF8ToAnsi(temp);
+ comment_length = strlen(temp);
+
+ if (strncasecmp(temp, "TITLE=", 6) == 0) {
+ name_length = 5;
+ p = &(entry->title);
+ } else if (strncasecmp(temp, "ALBUM=", 6) == 0) {
+ name_length = 5;
+ p = &(entry->album);
+ } else if (strncasecmp(temp, "ARTIST=", 7) == 0) {
+ name_length = 6;
+ p = &(entry->artist);
+ } else if (strncasecmp(temp, "GENRE=", 6) == 0) {
+ name_length = 5;
+ p = &(entry->genre_string);
+ } else if (strncasecmp(temp, "DATE=", 5) == 0) {
+ int j=0;
+ /* verify that this is a number */
+ /* Note: vorbis uses UTF-8 for its comments, so it is
+ * safe to compare the values against ASCII 0 and 9
+ */
+ while ( j < (comment_length - 5) ) {
+ if ( (temp[5+j] < '0') || (temp[5+j] > '9') ) {
+ break;
+ }
+ j++;
+ }
+ if ( j == (comment_length - 5) ) {
+ p = NULL;
+ entry->year = atoi(temp + 5);
+ }
+ } else if (strncasecmp(temp, "TRACKNUMBER=", 12) == 0) {
+ int j=0;
+ /* verify that this is a number */
+ /* Note: vorbis uses UTF-8 for its comments, so it is
+ * safe to compare the values against ASCII 0 and 9
+ */
+ while ( j < (comment_length - 12) ) {
+ if ( (temp[12+j] < '0') || (temp[12+j] > '9') ) {
+ break;
+ }
+ j++;
+ }
+ if ( j == (comment_length - 12) ) {
+ p = NULL;
+ entry->tracknum = atoi(temp + 12);
+ }
+ } else {
+ p = NULL;
+ }
+
+ if (p) {
+ comment_length -= (name_length + 1);
+ if ( comment_length < buffer_remaining ) {
+ strncpy(buffer, temp + name_length + 1, comment_length);
+ buffer[comment_length] = '\0';
+ *p = buffer;
+ buffer += comment_length + 1;
+ buffer_remaining -= comment_length + 1;
+ }
+ }
+ }
+
+ return true;
+}
+
generated by cgit (git 2.34.1) at 2023-09-30 10:02:01 +0000