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typefinding: detect enhanced AC-3

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=623846
This commit is contained in:
Parthasarathi Susarla 2010-07-20 12:08:52 +05:30 committed by Tim-Philipp Müller
parent ec3c19189d
commit aad661ec77
1 changed files with 56 additions and 21 deletions
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77
gst/typefind/gsttypefindfunctions.c
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@ -1158,6 +1158,10 @@ static GstStaticCaps ac3_caps = GST_STATIC_CAPS ("audio/x-ac3");
#define AC3_CAPS (gst_static_caps_get(&ac3_caps))
static GstStaticCaps eac3_caps = GST_STATIC_CAPS ("audio/x-eac3");
#define EAC3_CAPS (gst_static_caps_get(&eac3_caps))
struct ac3_frmsize
{
unsigned short bit_rate;
@ -1219,37 +1223,68 @@ ac3_type_find (GstTypeFind * tf, gpointer unused)
break;
if (c.data[0] == 0x0b && c.data[1] == 0x77) {
guint fscod = (c.data[4] >> 6) & 0x03;
guint frmsizecod = c.data[4] & 0x3f;
guint bsid = (c.data[5] >> 3) & 0x1F;
if (fscod < 3 && frmsizecod < 38) {
if (bsid <= 8) {
/* ac3 */
guint fscod = (c.data[4] >> 6) & 0x03;
guint frmsizecod = c.data[4] & 0x3f;
if (fscod < 3 && frmsizecod < 38) {
DataScanCtx c_next = c;
guint frame_size;
frame_size = ac3_frmsizecod_tbl[frmsizecod].frm_size[fscod];
GST_LOG ("possible AC3 frame sync at offset %"
G_GUINT64_FORMAT ", size=%u", c.offset, frame_size);
if (data_scan_ctx_ensure_data (tf, &c_next, (frame_size * 2) + 5)) {
data_scan_ctx_advance (tf, &c_next, frame_size * 2);
if (c_next.data[0] == 0x0b && c_next.data[1] == 0x77) {
guint fscod2 = (c_next.data[4] >> 6) & 0x03;
guint frmsizecod2 = c_next.data[4] & 0x3f;
if (fscod == fscod2 && frmsizecod == frmsizecod2) {
GstTypeFindProbability prob;
GST_LOG ("found second AC3 frame, looks good");
if (c.offset == 0)
prob = GST_TYPE_FIND_MAXIMUM;
else
prob = GST_TYPE_FIND_NEARLY_CERTAIN;
gst_type_find_suggest (tf, prob, AC3_CAPS);
return;
}
} else {
GST_LOG ("no second AC3 frame found, false sync");
}
}
}
} else {
/* eac3 */
DataScanCtx c_next = c;
guint frame_size;
frame_size = ac3_frmsizecod_tbl[frmsizecod].frm_size[fscod];
GST_LOG ("possible frame sync at offset %" G_GUINT64_FORMAT ", size=%u",
c.offset, frame_size);
frame_size = ((((c.data[2] & 0x07) << 8) +
(c.data[3] & 0xff)) + 1) << 1;
GST_LOG ("possible E-AC3 frame sync at offset %"
G_GUINT64_FORMAT ", size=%u", c.offset, frame_size);
if (data_scan_ctx_ensure_data (tf, &c_next, (frame_size * 2) + 5)) {
data_scan_ctx_advance (tf, &c_next, frame_size * 2);
if (c_next.data[0] == 0x0b && c_next.data[1] == 0x77) {
guint fscod2 = (c_next.data[4] >> 6) & 0x03;
guint frmsizecod2 = c_next.data[4] & 0x3f;
GstTypeFindProbability prob;
if (fscod == fscod2 && frmsizecod == frmsizecod2) {
GstTypeFindProbability prob;
GST_LOG ("found second E-AC3 frame, looks good");
if (c.offset == 0)
prob = GST_TYPE_FIND_MAXIMUM;
else
prob = GST_TYPE_FIND_NEARLY_CERTAIN;
GST_LOG ("found second frame, looks good");
if (c.offset == 0)
prob = GST_TYPE_FIND_MAXIMUM;
else
prob = GST_TYPE_FIND_NEARLY_CERTAIN;
gst_type_find_suggest (tf, prob, AC3_CAPS);
return;
}
gst_type_find_suggest (tf, prob, EAC3_CAPS);
} else {
GST_LOG ("no second frame found, false sync");
GST_LOG ("no second E-AC3 frame found, false sync");
}
}
}
@ -3873,7 +3908,7 @@ plugin_init (GstPlugin * plugin)
"s3m", "stm", "stx", "ult", "xm", NULL
};
static const gchar *mp3_exts[] = { "mp3", "mp2", "mp1", "mpga", NULL };
static const gchar *ac3_exts[] = { "ac3", NULL };
static const gchar *ac3_exts[] = { "ac3", "eac3", NULL };
static const gchar *dts_exts[] = { "dts", NULL };
static const gchar *gsm_exts[] = { "gsm", NULL };
static const gchar *musepack_exts[] = { "mpc", "mpp", "mp+", NULL };