bool ASessionDescription::getDurationUs(int64_t *durationUs) const {
*durationUs = 0;
CHECK(mIsValid);
AString value;
if (!findAttribute(0, "a=range", &value)) {
return false;
}
if (strncmp(value.c_str(), "npt=", 4)) {
return false;
}
float from, to;
if (!parseNTPRange(value.c_str() + 4, &from, &to)) {
return false;
}
*durationUs = (int64_t)((to - from) * 1E6);
return true;
}
bool ASessionDescription::getDurationUs(int64_t *durationUs) const {
*durationUs = 0;
CHECK(mIsValid);
AString value;
if (!findAttribute(0, "a=range", &value)) {
return false;
}
#ifndef ANDROID_DEFAULT_CODE
if (strncmp(value.c_str(), "npt=", 4) && strncmp(value.c_str(), "npt:", 4)) {
#else
if (strncmp(value.c_str(), "npt=", 4)) {
#endif // #ifndef ANDROID_DEFAULT_CODE
return false;
}
float from, to;
if (!parseNTPRange(value.c_str() + 4, &from, &to)) {
return false;
}
*durationUs = (int64_t)((to - from) * 1E6);
return true;
}
// static
void ASessionDescription::ParseFormatDesc(
const char *desc, int32_t *timescale, int32_t *numChannels) {
const char *slash1 = strchr(desc, '/');
CHECK(slash1 != NULL);
const char *s = slash1 + 1;
char *end;
unsigned long x = strtoul(s, &end, 10);
CHECK_GT(end, s);
CHECK(*end == '\0' || *end == '/');
*timescale = x;
*numChannels = 1;
if (*end == '/') {
s = end + 1;
unsigned long x = strtoul(s, &end, 10);
CHECK_GT(end, s);
CHECK_EQ(*end, '\0');
*numChannels = x;
}
}
// static
bool ASessionDescription::parseNTPRange(
const char *s, float *npt1, float *npt2) {
if (s[0] == '-') {
return false; // no start time available.
}
if (!strncmp("now", s, 3)) {
return false; // no absolute start time available
}
char *end;
*npt1 = strtof(s, &end);
if (end == s || *end != '-') {
// Failed to parse float or trailing "dash".
return false;
}
s = end + 1; // skip the dash.
if (!strncmp("now", s, 3)) {
return false; // no absolute end time available
}
*npt2 = strtof(s, &end);
if (end == s || *end != '\0') {
return false;
}
return *npt2 > *npt1;
}
#ifndef ANDROID_DEFAULT_CODE
bool ASessionDescription::getBitrate(size_t index, int32_t* bitrate) const {
char key[] = "b=AS";
AString value;
if (!findAttribute(index, key, &value))
return false;
int32_t b = atoi(value.c_str());
b *= 1000;
if (b < 0)
return false;
*bitrate = b;
return true;
}
