status_t ESDS::parseDecoderConfigDescriptor(size_t offset, size_t size) {
if (size < 13) {
return ERROR_MALFORMED;
}
mObjectTypeIndication = mData[offset];
offset += 13;
size -= 13;
if (size == 0) {
mDecoderSpecificOffset = 0;
mDecoderSpecificLength = 0;
return OK;
}
uint8_t tag;
size_t sub_offset, sub_size;
status_t err = skipDescriptorHeader(
offset, size, &tag, &sub_offset, &sub_size);
if (err != OK) {
return err;
}
if (tag != kTag_DecoderSpecificInfo) {
return ERROR_MALFORMED;
}
mDecoderSpecificOffset = sub_offset;
mDecoderSpecificLength = sub_size;
return OK;
}
status_t ESDS::parseESDescriptor(size_t offset, size_t size) {
if (size < 3) {
return ERROR_MALFORMED;
}
offset += 2; // skip ES_ID
size -= 2;
unsigned streamDependenceFlag = mData[offset] & 0x80;
unsigned URL_Flag = mData[offset] & 0x40;
unsigned OCRstreamFlag = mData[offset] & 0x20;
++offset;
--size;
if (streamDependenceFlag) {
offset += 2;
size -= 2;
}
if (URL_Flag) {
if (offset >= size) {
return ERROR_MALFORMED;
}
unsigned URLlength = mData[offset];
offset += URLlength + 1;
size -= URLlength + 1;
}
if (OCRstreamFlag) {
offset += 2;
size -= 2;
}
if (offset >= size) {
return ERROR_MALFORMED;
}
uint8_t tag;
size_t sub_offset, sub_size;
status_t err = skipDescriptorHeader(
offset, size, &tag, &sub_offset, &sub_size);
if (err != OK) {
return err;
}
if (tag != kTag_DecoderConfigDescriptor) {
return ERROR_MALFORMED;
}
err = parseDecoderConfigDescriptor(sub_offset, sub_size);
return err;
}
status_t ESDS::parseESDescriptor(size_t offset, size_t size) {
if (size < 3) {
return ERROR_MALFORMED;
}
offset += 2; // skip ES_ID
size -= 2;
unsigned streamDependenceFlag = mData[offset] & 0x80;
unsigned URL_Flag = mData[offset] & 0x40;
unsigned OCRstreamFlag = mData[offset] & 0x20;
++offset;
--size;
if (streamDependenceFlag) {
offset += 2;
size -= 2;
}
if (URL_Flag) {
if (offset >= size) {
return ERROR_MALFORMED;
}
unsigned URLlength = mData[offset];
offset += URLlength + 1;
size -= URLlength + 1;
}
if (OCRstreamFlag) {
offset += 2;
size -= 2;
if ((offset >= size || mData[offset] != kTag_DecoderConfigDescriptor)
&& offset - 2 < size
&& mData[offset - 2] == kTag_DecoderConfigDescriptor) {
// Content found "in the wild" had OCRstreamFlag set but was
// missing OCR_ES_Id, the decoder config descriptor immediately
// followed instead.
offset -= 2;
size += 2;
LOGW("Found malformed 'esds' atom, ignoring missing OCR_ES_Id.");
}
}
if (offset >= size) {
return ERROR_MALFORMED;
}
uint8_t tag;
size_t sub_offset, sub_size;
status_t err = skipDescriptorHeader(
offset, size, &tag, &sub_offset, &sub_size);
if (err != OK) {
return err;
}
if (tag != kTag_DecoderConfigDescriptor) {
return ERROR_MALFORMED;
}
err = parseDecoderConfigDescriptor(sub_offset, sub_size);
return err;
}
status_t ESDS::parse() {
uint8_t tag;
size_t data_offset;
size_t data_size;
status_t err =
skipDescriptorHeader(0, mSize, &tag, &data_offset, &data_size);
if (err != OK) {
return err;
}
if (tag != kTag_ESDescriptor) {
return ERROR_MALFORMED;
}
return parseESDescriptor(data_offset, data_size);
}
status_t ESDS::parseDecoderConfigDescriptor(size_t offset, size_t size) {
if (size < 13) {
return ERROR_MALFORMED;
}
mObjectTypeIndication = mData[offset];
offset += 13;
size -= 13;
if (size == 0) {
mDecoderSpecificOffset = 0;
mDecoderSpecificLength = 0;
return OK;
}
uint8_t tag;
size_t sub_offset, sub_size;
status_t err = skipDescriptorHeader(
offset, size, &tag, &sub_offset, &sub_size);
if (err != OK) {
return err;
}
if (tag != kTag_DecoderSpecificInfo) {
#ifdef MTK_AOSP_ENHANCEMENT
ALOGW("No Decoder Specific Info(0x05) in esds");
if (mObjectTypeIndication != 0x6B && mObjectTypeIndication != 0x69)
return ERROR_UNSUPPORTED;
#else
return ERROR_MALFORMED;
#endif
}
mDecoderSpecificOffset = sub_offset;
mDecoderSpecificLength = sub_size;
return OK;
}