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mpegaudioparse: ensure 2 valid headers in a row when resyncing

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This commit is contained in:
Mark Nauwelaerts 2009-09-17 16:12:29 +02:00
parent 59f5b02444
commit 57d01c2526
1 changed files with 17 additions and 9 deletions
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26
gst/mpegaudioparse/gstmpegaudioparse.c
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@ -1333,23 +1333,31 @@ gst_mp3parse_chain (GstPad * pad, GstBuffer * buf)
(0xf << 4) /* mode|mode extension */ | \ (0xf << 4) /* mode|mode extension */ | \
(0xf)) /* copyright|emphasis */ (0xf)) /* copyright|emphasis */
/* require 2 matching headers in a row */ /* require 2 valid matching headers in a row */
if ((header2 & HDRMASK) != (header & HDRMASK)) { if ((header2 & HDRMASK) != (header & HDRMASK)) {
GST_DEBUG_OBJECT (mp3parse, "next header doesn't match " GST_DEBUG_OBJECT (mp3parse, "next header doesn't match "
"(header=%08X (%08X), header2=%08X (%08X), bpf=%d)", "(header=%08X (%08X), header2=%08X (%08X), bpf=%d)",
(guint) header, (guint) header & HDRMASK, (guint) header2, (guint) header, (guint) header & HDRMASK, (guint) header2,
(guint) header2 & HDRMASK, bpf); (guint) header2 & HDRMASK, bpf);
/* This frame is invalid. Start looking for a valid frame at the } else if ((((header2 >> 12) & 0xf) == 0) ||
* next position in the stream */ (((header2 >> 12) & 0xf) == 0xf)) {
mp3parse->resyncing = TRUE; /* optimized validity check for almost equal headers;
gst_adapter_flush (mp3parse->adapter, 1); * only bitrate needs checking */
if (mp3parse->cur_offset != -1) GST_DEBUG_OBJECT (mp3parse, "next header invalid (bitrate)");
mp3parse->cur_offset++; } else {
mp3parse->tracked_offset++; goto valid;
continue;
} }
/* This frame is invalid. Start looking for a valid frame at the
* next position in the stream */
mp3parse->resyncing = TRUE;
gst_adapter_flush (mp3parse->adapter, 1);
if (mp3parse->cur_offset != -1)
mp3parse->cur_offset++;
mp3parse->tracked_offset++;
continue;
} }
valid:
/* if we don't have the whole frame... */ /* if we don't have the whole frame... */
if (available < bpf) { if (available < bpf) {
GST_DEBUG_OBJECT (mp3parse, "insufficient data available, need " GST_DEBUG_OBJECT (mp3parse, "insufficient data available, need "