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fix: validate short AAC RTP payloads

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This commit is contained in:
YuLi
2026-07-24 15:21:32 -07:00
parent ac64e3314b
commit bc5de93e10
1 changed files with 12 additions and 12 deletions
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24
ext-codec/AACRtp.cpp
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@@ -55,9 +55,9 @@ 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 [AUTO-TRANSLATED:2267e6ac]
// No actual load
if (payload_size < 2) {
// AU-Header-Length至少占用两个字节 [AUTO-TRANSLATED:2267e6ac]
// AU-Header-Length occupies at least two bytes
return false;
}
@@ -77,16 +77,16 @@ bool AACRtpDecoder::inputRtp(const RtpPacket::Ptr &rtp, bool key_pos) {
WarnL << "invalid aac rtp au_header_count";
return false;
}
auto au_headers_size = static_cast<size_t>(au_header_count) * 2;
if (static_cast<size_t>(payload_size) - 2 < au_headers_size) {
// AU-Header数据不完整 [AUTO-TRANSLATED:830a2785]
// Incomplete AU-Header data
return false;
}
// 记录au_header起始指针 [AUTO-TRANSLATED:b9083b72]
// Record the starting pointer of au_header
auto au_header_ptr = ptr + 2;
ptr = au_header_ptr + au_header_count * 2;
if (end < ptr) {
// 数据不够 [AUTO-TRANSLATED:830a2785]
// Not enough data
return false;
}
ptr = au_header_ptr + au_headers_size;
if (!_last_dts) {
// 记录第一个时间戳 [AUTO-TRANSLATED:2e85b398]
@@ -130,7 +130,7 @@ bool AACRtpDecoder::inputRtp(const RtpPacket::Ptr &rtp, bool key_pos) {
void AACRtpDecoder::flushData() {
auto ptr = reinterpret_cast<const uint8_t *>(_frame->data());
if ((ptr[0] == 0xFF && (ptr[1] & 0xF0) == 0xF0) && _frame->size() > ADTS_HEADER_LEN) {
if (_frame->size() > ADTS_HEADER_LEN && ptr[0] == 0xFF && (ptr[1] & 0xF0) == 0xF0) {
// adts头打入了rtp包，不符合规范，兼容EasyPusher的bug [AUTO-TRANSLATED:203a5ee9]
// The adts header is inserted into the rtp packet, which is not compliant with the specification, compatible with the bug of EasyPusher
_frame->_prefix_size = ADTS_HEADER_LEN;
@@ -139,4 +139,4 @@ void AACRtpDecoder::flushData() {
obtainFrame();
}
}//namespace mediakit
}//namespace mediakit