status_t TextDescriptions::getParcelOfDescriptions(
const uint8_t *data, ssize_t size,
uint32_t flags, int timeMs, Parcel *parcel) {
parcel->freeData();
if (flags & IN_BAND_TEXT_3GPP) {
if (flags & GLOBAL_DESCRIPTIONS) {
return extract3GPPGlobalDescriptions(data, size, parcel);
} else if (flags & LOCAL_DESCRIPTIONS) {
return extract3GPPLocalDescriptions(data, size, timeMs, parcel);
}
} else if (flags & OUT_OF_BAND_TEXT_SRT) {
if (flags & LOCAL_DESCRIPTIONS) {
return extractSRTLocalDescriptions(data, size, timeMs, parcel);
}
}
return ERROR_UNSUPPORTED;
}
// To extract box 'tx3g' defined in 3GPP TS 26.245, and store it in a Parcel
status_t TextDescriptions::extract3GPPGlobalDescriptions(
const uint8_t *data, ssize_t size, Parcel *parcel, int depth) {
ssize_t chunkSize = U32_AT(data);
uint32_t chunkType = U32_AT(data + 4);
const uint8_t *tmpData = data;
tmpData += 8;
if (size < chunkSize) {
return OK;
}
if (depth == 0) {
parcel->writeInt32(KEY_GLOBAL_SETTING);
}
switch(chunkType) {
case FOURCC('t', 'x', '3', 'g'):
{
tmpData += 8; // skip the first 8 bytes
parcel->writeInt32(KEY_DISPLAY_FLAGS);
parcel->writeInt32(U32_AT(tmpData));
parcel->writeInt32(KEY_STRUCT_JUSTIFICATION);
parcel->writeInt32(tmpData[4]);
parcel->writeInt32(tmpData[5]);
parcel->writeInt32(KEY_BACKGROUND_COLOR_RGBA);
uint32_t rgba = *(tmpData + 6) << 24 | *(tmpData + 7) << 16
| *(tmpData + 8) << 8 | *(tmpData + 9);
parcel->writeInt32(rgba);
tmpData += 10;
parcel->writeInt32(KEY_STRUCT_TEXT_POS);
parcel->writeInt32(U16_AT(tmpData));
parcel->writeInt32(U16_AT(tmpData + 2));
parcel->writeInt32(U16_AT(tmpData + 4));
parcel->writeInt32(U16_AT(tmpData + 6));
tmpData += 8;
parcel->writeInt32(KEY_STRUCT_STYLE_LIST);
parcel->writeInt32(KEY_START_CHAR);
parcel->writeInt32(U16_AT(tmpData));
parcel->writeInt32(KEY_END_CHAR);
parcel->writeInt32(U16_AT(tmpData + 2));
parcel->writeInt32(KEY_FONT_ID);
parcel->writeInt32(U16_AT(tmpData + 4));
parcel->writeInt32(KEY_STYLE_FLAGS);
parcel->writeInt32(*(tmpData + 6));
parcel->writeInt32(KEY_FONT_SIZE);
parcel->writeInt32(*(tmpData + 7));
parcel->writeInt32(KEY_TEXT_COLOR_RGBA);
rgba = *(tmpData + 8) << 24 | *(tmpData + 9) << 16
| *(tmpData + 10) << 8 | *(tmpData + 11);
parcel->writeInt32(rgba);
tmpData += 12;
parcel->writeInt32(KEY_STRUCT_FONT_LIST);
uint16_t count = U16_AT(tmpData);
parcel->writeInt32(count);
tmpData += 2;
for (int i = 0; i < count; i++) {
// font ID
parcel->writeInt32(U16_AT(tmpData));
// font name length
parcel->writeInt32(*(tmpData + 2));
int len = *(tmpData + 2);
parcel->write(tmpData + 3, len);
tmpData += 3 + len;
}
break;
}
default:
{
break;
}
}
data += chunkSize;
size -= chunkSize;
if (size > 0) {
// continue to extract next 'tx3g'
return extract3GPPGlobalDescriptions(data, size, parcel, 1);
}
return OK;
}
