Fix AC-4 parser bugs according to specification
pre_virtualized and add_emdf_substreams should locate
in the same level with single_substream_group checking.
Bug: 127685179
Test: see repro steps
Change-Id: Ic715b316f2b0d0fc86dfd9db03ba7bf01a1f0a2e
diff --git a/media/extractors/mp4/AC4Parser.cpp b/media/extractors/mp4/AC4Parser.cpp
index 59a2e9b..13d60c8 100644
--- a/media/extractors/mp4/AC4Parser.cpp
+++ b/media/extractors/mp4/AC4Parser.cpp
@@ -260,7 +260,7 @@
int32_t short_program_id = -1;
if (bitstream_version > 1) {
- if (ac4_dsi_version == 0){
+ if (ac4_dsi_version == 0) {
ALOGE("invalid ac4 dsi");
return false;
}
@@ -295,6 +295,7 @@
bool b_single_substream_group = false;
uint32_t presentation_config = 0, presentation_version = 0;
uint32_t pres_bytes = 0;
+ uint64_t start = 0;
if (ac4_dsi_version == 0) {
CHECK_BITS_LEFT(1 + 5 + 5);
@@ -315,6 +316,8 @@
mBitReader.skipBits(pres_bytes * 8);
continue;
}
+ /* record a marker, less the size of the presentation_config */
+ start = (mDSISize - mBitReader.numBitsLeft()) / 8;
// ac4_presentation_v0_dsi(), ac4_presentation_v1_dsi() and ac4_presentation_v2_dsi()
// all start with a presentation_config of 5 bits
CHECK_BITS_LEFT(5);
@@ -338,9 +341,6 @@
(presentation_config >= NELEM(PresentationConfig) ?
"reserved" : PresentationConfig[presentation_config]));
- /* record a marker, less the size of the presentation_config */
- uint64_t start = (mDSISize - mBitReader.numBitsLeft()) / 8;
-
bool b_add_emdf_substreams = false;
if (!b_single_substream_group && presentation_config == 6) {
b_add_emdf_substreams = true;
@@ -535,14 +535,14 @@
}
break;
}
- CHECK_BITS_LEFT(1 + 1);
- bool b_pre_virtualized = (mBitReader.getBits(1) == 1);
- mPresentations[presentation].mPreVirtualized = b_pre_virtualized;
- b_add_emdf_substreams = (mBitReader.getBits(1) == 1);
- ALOGV("%u: b_pre_virtualized = %s\n", presentation, BOOLSTR(b_pre_virtualized));
- ALOGV("%u: b_add_emdf_substreams = %s\n", presentation,
- BOOLSTR(b_add_emdf_substreams));
}
+ CHECK_BITS_LEFT(1 + 1);
+ bool b_pre_virtualized = (mBitReader.getBits(1) == 1);
+ mPresentations[presentation].mPreVirtualized = b_pre_virtualized;
+ b_add_emdf_substreams = (mBitReader.getBits(1) == 1);
+ ALOGV("%u: b_pre_virtualized = %s\n", presentation, BOOLSTR(b_pre_virtualized));
+ ALOGV("%u: b_add_emdf_substreams = %s\n", presentation,
+ BOOLSTR(b_add_emdf_substreams));
}
if (b_add_emdf_substreams) {
CHECK_BITS_LEFT(7);
@@ -599,10 +599,6 @@
if (ac4_dsi_version == 1) {
uint64_t end = (mDSISize - mBitReader.numBitsLeft()) / 8;
- if (mBitReader.numBitsLeft() % 8 != 0) {
- end += 1;
- }
-
uint64_t presentation_bytes = end - start;
uint64_t skip_bytes = pres_bytes - presentation_bytes;
ALOGV("skipping = %" PRIu64 " bytes", skip_bytes);
@@ -612,7 +608,7 @@
// we should know this or something is probably wrong
// with the bitstream (or we don't support it)
- if (mPresentations[presentation].mChannelMode == -1){
+ if (mPresentations[presentation].mChannelMode == -1) {
ALOGE("could not determing channel mode of presentation %d", presentation);
return false;
}