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修复aac rtp解码兼容性相关bug

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This commit is contained in:
xiongziliang 2024-06-15 15:11:36 +08:00
parent 170ec3c830
commit 720d6304d2
1 changed files with 22 additions and 23 deletions
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45
ext-codec/AACRtp.cpp
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@ -55,62 +55,61 @@ void AACRtpDecoder::obtainFrame() {
bool AACRtpDecoder::inputRtp(const RtpPacket::Ptr &rtp, bool key_pos) {
auto payload_size = rtp->getPayloadSize();
if (payload_size <= 0) {
//无实际负载
// 无实际负载
return false;
}
auto stamp = rtp->getStampMS();
//rtp数据开始部分
// rtp数据开始部分
auto ptr = rtp->getPayload();
//rtp数据末尾
// rtp数据末尾
auto end = ptr + payload_size;
//首2字节表示Au-Header的个数，单位bit，所以除以16得到Au-Header个数
// 首2字节表示Au-Header的个数，单位bit，所以除以16得到Au-Header个数
auto au_header_count = ((ptr[0] << 8) | ptr[1]) >> 4;
if (!au_header_count) {
//问题issue: https://github.com/ZLMediaKit/ZLMediaKit/issues/1869
// 问题issue: https://github.com/ZLMediaKit/ZLMediaKit/issues/1869
WarnL << "invalid aac rtp au_header_count";
return false;
}
//记录au_header起始指针
// 记录au_header起始指针
auto au_header_ptr = ptr + 2;
ptr = au_header_ptr + au_header_count * 2;
ptr = au_header_ptr + au_header_count * 2;
if (end < ptr) {
//数据不够
// 数据不够
return false;
}
if (!_last_dts) {
//记录第一个时间戳
// 记录第一个时间戳
_last_dts = stamp;
}
//每个audio unit时间戳增量
// 每个audio unit时间戳增量
auto dts_inc = (stamp - _last_dts) / au_header_count;
if (dts_inc < 0 && dts_inc > 100) {
//时间戳增量异常，忽略
if (dts_inc < 0 || dts_inc > 100) {
// 时间戳增量异常，忽略
dts_inc = 0;
}
for (int i = 0; i < au_header_count; ++i) {
for (auto i = 0u; i < (size_t)au_header_count; ++i) {
// 之后的2字节是AU_HEADER,其中高13位表示一帧AAC负载的字节长度，低3位无用
uint16_t size = ((au_header_ptr[0] << 8) | au_header_ptr[1]) >> 3;
if (ptr + size > end) {
//数据不够
auto size = ((au_header_ptr[0] << 8) | au_header_ptr[1]) >> 3;
auto len = std::min<int>(size, end - ptr);
if (len <= 0) {
break;
}
_frame->_buffer.append((char *)ptr, len);
ptr += len;
au_header_ptr += 2;
if (size) {
//设置aac数据
_frame->_buffer.assign((char *) ptr, size);
//设置当前audio unit时间戳
if (_frame->size() == (size_t)size) {
// 设置当前audio unit时间戳
_frame->_dts = _last_dts + i * dts_inc;
ptr += size;
au_header_ptr += 2;
flushData();
}
}
//记录上次时间戳
// 记录上次时间戳
_last_dts = stamp;
return false;
}