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Populate the last payload length field in the video header

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Cameron Gutman 2023-08-13 10:51:01 -05:00
parent a84dea3862
commit 67c1fa6da7
1 changed files with 25 additions and 12 deletions
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37
src/stream.cpp
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@ -98,7 +98,11 @@ namespace stream {
// 5 = P-frame after reference frame invalidation
std::uint8_t frameType;
std::uint8_t unknown2[4];
// Length of the final packet payload for codecs that cannot handle
// zero padding, such as AV1 (Sunshine extension).
boost::endian::little_uint16_at lastPayloadLen;
std::uint8_t unknown[2];
};
static_assert(
@ -1120,13 +1124,31 @@ namespace stream {
auto lowseq = session->video.lowseq;
std::string_view payload { (char *) packet->data(), packet->data_size() };
std::vector<uint8_t> payload_new;
std::vector<uint8_t> payload_with_replacements;
// Apply replacements on the packet payload before performing any other operations.
// We need to know the final frame size to calculate the last packet size, and we
// must avoid matching replacements against the frame header or any other non-video
// part of the payload.
if (packet->is_idr() && packet->replacements) {
for (auto &replacement : *packet->replacements) {
auto frame_old = replacement.old;
auto frame_new = replacement._new;
payload_with_replacements = replace(payload, frame_old, frame_new);
payload = { (char *) payload_with_replacements.data(), payload_with_replacements.size() };
}
}
video_short_frame_header_t frame_header = {};
frame_header.headerType = 0x01; // Short header type
frame_header.frameType = packet->is_idr() ? 2 :
packet->after_ref_frame_invalidation ? 5 :
1;
frame_header.lastPayloadLen = (payload.size() + sizeof(frame_header)) % (session->config.packetsize - sizeof(NV_VIDEO_PACKET));
if (frame_header.lastPayloadLen == 0) {
frame_header.lastPayloadLen = session->config.packetsize - sizeof(NV_VIDEO_PACKET);
}
if (packet->frame_timestamp) {
auto duration_to_latency = [](const std::chrono::steady_clock::duration &duration) {
@ -1151,21 +1173,12 @@ namespace stream {
frame_header.frame_processing_latency = 0;
}
std::vector<uint8_t> payload_new;
std::copy_n((uint8_t *) &frame_header, sizeof(frame_header), std::back_inserter(payload_new));
std::copy(std::begin(payload), std::end(payload), std::back_inserter(payload_new));
payload = { (char *) payload_new.data(), payload_new.size() };
if (packet->is_idr() && packet->replacements) {
for (auto &replacement : *packet->replacements) {
auto frame_old = replacement.old;
auto frame_new = replacement._new;
payload_new = replace(payload, frame_old, frame_new);
payload = { (char *) payload_new.data(), payload_new.size() };
}
}
// insert packet headers
auto blocksize = session->config.packetsize + MAX_RTP_HEADER_SIZE;
auto payload_blocksize = blocksize - sizeof(video_packet_raw_t);