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bugfix: allow ID3v2 tags at start of audio

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Original commit message from CVS:
bugfix: allow ID3v2 tags at start of audio
This commit is contained in:
Benjamin Otte 2002-02-08 08:31:47 +00:00
parent 7474f54942
commit 679a728cc1
1 changed files with 30 additions and 1 deletions
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31
gst/mpegaudioparse/gstmp3types.c
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@ -19,6 +19,7 @@
//#define DEBUG_ENABLED //#define DEBUG_ENABLED
#include <gst/gst.h> #include <gst/gst.h>
#include <string.h> /* memcmp */
static GstCaps* mp3_typefind(GstBuffer *buf, gpointer private); static GstCaps* mp3_typefind(GstBuffer *buf, gpointer private);
@ -30,10 +31,38 @@ static GstTypeDefinition mp3type_definitions[] = {
static GstCaps* static GstCaps*
mp3_typefind(GstBuffer *buf, gpointer private) mp3_typefind(GstBuffer *buf, gpointer private)
{ {
gulong head = GULONG_FROM_BE(*((gulong *)GST_BUFFER_DATA(buf))); gchar *data;
gulong head;
data = GST_BUFFER_DATA(buf);
GstCaps *caps; GstCaps *caps;
GST_DEBUG (0,"mp3typefind: typefind\n"); GST_DEBUG (0,"mp3typefind: typefind\n");
/* check for ID3 Tag first and forward ID3 length */
if (!memcmp (data, "ID3", 3))
{
guint32 skip;
/* ignore next 3 bytes */
data += 6;
/* if you want that thing faster, do it */
skip = GUINT32_FROM_BE(*((guint32 *)data));
skip = (((skip & 0x7f000000) >> 3) |
((skip & 0x007f0000) >> 2) |
((skip & 0x00007f00) >> 1) |
((skip & 0x0000007f) >> 0)) + 4
GST_DEBUG (0, "mp3typefind: detected ID3 Tag with %u bytes\n", skip + 6);
/* return if buffer is not big enough */
if (GST_BUFFER_SIZE (buf) < skip + 10)
{
GST_DEBUG (0, "mp3typefind: buffer too small to go on typefinding\n", skip + 6);
return NULL;
}
data += skip;
}
/* now with the right postion, do typefinding */
head = GULONG_FROM_BE(*((gulong *)data));
if ((head & 0xffe00000) != 0xffe00000) if ((head & 0xffe00000) != 0xffe00000)
return NULL; return NULL;
if (!((head >> 17) & 3)) if (!((head >> 17) & 3))