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hlsdemux: Properly parse IV from the playlist

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Without this every fragment's first 16 bytes will be corrupted
if not the fallback IV is used by the playlist.
This commit is contained in:
Sebastian Dröge 2014-02-11 18:15:07 +01:00
parent 3726c00b95
commit 56faad51bb
1 changed files with 87 additions and 2 deletions
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89
ext/hls/m3u8.c
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@ -214,6 +214,53 @@ gst_m3u8_compare_playlist_by_bitrate (gconstpointer a, gconstpointer b)
return ((GstM3U8 *) (a))->bandwidth - ((GstM3U8 *) (b))->bandwidth;
}
static gint
hex_char_to_int (const gchar * v)
{
switch (*v) {
case '0':
return 0;
case '1':
return 1;
case '2':
return 2;
case '3':
return 3;
case '4':
return 4;
case '5':
return 5;
case '6':
return 6;
case '7':
return 7;
case '8':
return 8;
case '9':
return 9;
case 'A':
case 'a':
return 0xa;
case 'B':
case 'b':
return 0xb;
case 'C':
case 'c':
return 0xc;
case 'D':
case 'd':
return 0xd;
case 'E':
case 'e':
return 0xe;
case 'F':
case 'f':
return 0xf;
default:
return -1;
}
}
/*
* @data: a m3u8 playlist text data, taking ownership
*/
@ -225,6 +272,8 @@ gst_m3u8_update (GstM3U8 * self, gchar * data, gboolean * updated)
gchar *title, *end;
// gboolean discontinuity;
GstM3U8 *list;
gboolean have_iv = FALSE;
guint8 iv[16] = { 0, };
g_return_val_if_fail (self != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE);
@ -301,8 +350,12 @@ gst_m3u8_update (GstM3U8 * self, gchar * data, gboolean * updated)
/* set encryption params */
file->key = g_strdup (self->key);
if (file->key) {
guint8 *iv = file->iv + 12;
GST_WRITE_UINT32_BE (iv, file->sequence);
if (have_iv) {
memcpy (file->iv, iv, sizeof (iv));
} else {
guint8 *iv = file->iv + 12;
GST_WRITE_UINT32_BE (iv + 12, file->sequence);
}
}
duration = 0;
@ -365,6 +418,11 @@ gst_m3u8_update (GstM3U8 * self, gchar * data, gboolean * updated)
gchar *v, *a;
data = data + 11;
/* IV and KEY are only valid until the next #EXT-X-KEY */
have_iv = FALSE;
g_free (self->key);
self->key = NULL;
while (data && parse_attributes (&data, &a, &v)) {
if (g_str_equal (a, "URI")) {
gchar *key = g_strdup (v);
@ -379,6 +437,33 @@ gst_m3u8_update (GstM3U8 * self, gchar * data, gboolean * updated)
self->key = uri_join (self->uri, key);
g_free (keyp);
} else if (g_str_equal (a, "IV")) {
gchar *ivp = v;
gint i;
if (strlen (ivp) < 32 + 2 || (!g_str_has_prefix (ivp, "0x")
&& !g_str_has_prefix (ivp, "0X"))) {
GST_WARNING ("Can't read IV");
continue;
}
ivp += 2;
for (i = 0; i < 16; i++) {
gint h, l;
h = hex_char_to_int (ivp++);
l = hex_char_to_int (ivp++);
if (h == -1 || l == -1) {
i = -1;
break;
}
iv[i] = (h << 4) | l;
}
if (i == -1) {
GST_WARNING ("Can't read IV");
continue;
}
have_iv = TRUE;
}
}
} else if (g_str_has_prefix (data, "#EXTINF:")) {