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flacparse: rework gst_flac_parse_frame_is_valid()

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drop unnecessary nesting looking for end of frame
This commit is contained in:
Reynaldo H. Verdejo Pinochet 2015-12-30 01:56:26 -08:00
parent 90b62be301
commit 276fcc5916
1 changed files with 25 additions and 23 deletions
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48
gst/audioparsers/gstflacparse.c
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@ -676,32 +676,34 @@ gst_flac_parse_frame_is_valid (GstFlacParse * flacparse,
remaining = map.size;
for (i = search_start; i < search_end; i++, remaining--) {
if ((GST_READ_UINT16_BE (map.data + i) & 0xfffe) == 0xfff8) {
GST_LOG_OBJECT (flacparse, "possible frame end at offset %d", i);
suspect_end = FALSE;
header_ret =
gst_flac_parse_frame_header_is_valid (flacparse, map.data + i,
remaining, FALSE, NULL, &suspect_end);
if (header_ret == FRAME_HEADER_VALID) {
if (flacparse->check_frame_checksums || suspect_start || suspect_end) {
guint16 actual_crc = gst_flac_calculate_crc16 (map.data, i - 2);
guint16 expected_crc = GST_READ_UINT16_BE (map.data + i - 2);
GST_LOG_OBJECT (flacparse,
"checking checksum, frame suspect (%d, %d)",
suspect_start, suspect_end);
if (actual_crc != expected_crc) {
GST_DEBUG_OBJECT (flacparse, "checksum did not match");
continue;
}
if ((GST_READ_UINT16_BE (map.data + i) & 0xfffe) != 0xfff8)
continue;
GST_LOG_OBJECT (flacparse, "possible frame end at offset %d", i);
suspect_end = FALSE;
header_ret =
gst_flac_parse_frame_header_is_valid (flacparse, map.data + i,
remaining, FALSE, NULL, &suspect_end);
if (header_ret == FRAME_HEADER_VALID) {
if (flacparse->check_frame_checksums || suspect_start || suspect_end) {
guint16 actual_crc = gst_flac_calculate_crc16 (map.data, i - 2);
guint16 expected_crc = GST_READ_UINT16_BE (map.data + i - 2);
GST_LOG_OBJECT (flacparse,
"checking checksum, frame suspect (%d, %d)",
suspect_start, suspect_end);
if (actual_crc != expected_crc) {
GST_DEBUG_OBJECT (flacparse, "checksum did not match");
continue;
}
*ret = i;
flacparse->block_size = block_size;
result = TRUE;
goto cleanup;
} else if (header_ret == FRAME_HEADER_MORE_DATA) {
goto need_more;
}
*ret = i;
flacparse->block_size = block_size;
result = TRUE;
goto cleanup;
} else if (header_ret == FRAME_HEADER_MORE_DATA) {
goto need_more;
}
}