583 lines
18 KiB
C++
583 lines
18 KiB
C++
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/*
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* Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
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*
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* Use of this source code is governed by MIT-like license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#include "AV1.h"
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#include "AV1Rtp.h"
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#include <algorithm>
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#include <cstring>
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#include <vector>
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#include <sstream>
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#include <iomanip>
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using namespace std;
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using namespace toolkit;
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namespace mediakit {
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// AV1 OBU类型定义
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static constexpr int kObuTypeSequenceHeader = 1;
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static constexpr int kObuTypeTemporalDelimiter = 2;
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static constexpr int kObuTypeTileList = 8;
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static constexpr int kObuTypePadding = 15;
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// RTP聚合头中的位定义
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static constexpr uint8_t kObuSizePresentBit = 0b00000010;
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static constexpr int kAggregationHeaderSize = 1;
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static constexpr int kMaxNumObusToOmitSize = 3;
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// LEB128编码/解码辅助函数
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static size_t writeLeb128(uint64_t value, uint8_t* buffer) {
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size_t size = 0;
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do {
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uint8_t byte = value & 0x7F;
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value >>= 7;
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if (value != 0) {
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byte |= 0x80;
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}
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buffer[size++] = byte;
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} while (value != 0);
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return size;
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}
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static size_t leb128Size(uint64_t value) {
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size_t size = 0;
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do {
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value >>= 7;
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++size;
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} while (value != 0);
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return size;
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}
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static bool readLeb128(const uint8_t*& data, size_t& remaining, uint64_t& value) {
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value = 0;
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size_t shift = 0;
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while (remaining > 0 && shift < 56) {
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uint8_t byte = *data++;
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remaining--;
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value |= (uint64_t(byte & 0x7F) << shift);
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shift += 7;
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if ((byte & 0x80) == 0) {
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return true;
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}
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}
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// 兼容性处理：如果到达数据末尾但最后一个字节的MSB仍为1，
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// 假设这是leb128编码的结尾
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if (remaining == 0 && shift > 0) {
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WarnL << "Tolerating non-standard LEB128 encoding (missing termination bit)";
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return true;
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}
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return false;
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}
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// OBU辅助函数
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static bool obuHasExtension(uint8_t obu_header) {
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return obu_header & 0b00000100;
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}
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static bool obuHasSize(uint8_t obu_header) {
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return obu_header & kObuSizePresentBit;
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}
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static int obuType(uint8_t obu_header) {
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return (obu_header & 0b01111000) >> 3;
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}
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static int maxFragmentSize(int remaining_bytes) {
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if (remaining_bytes <= 1) {
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return 0;
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}
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for (int i = 1; ; ++i) {
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if (remaining_bytes < (1 << (7 * i)) + i) {
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return remaining_bytes - i;
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}
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}
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}
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//////////////////////////////////////////////////////////////////////////
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// AV1RtpEncoder 实现
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//////////////////////////////////////////////////////////////////////////
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AV1RtpEncoder::AV1RtpEncoder() {
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}
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std::vector<AV1RtpEncoder::ObuInfo> AV1RtpEncoder::parseObus(const uint8_t* data, size_t size) {
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std::vector<ObuInfo> result;
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const uint8_t* ptr = data;
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size_t remaining = size;
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while (remaining > 0) {
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if (remaining < 1) {
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WarnL << "Malformed AV1 input: expected OBU header";
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return {};
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}
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ObuInfo obu{};
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obu.header = *ptr++;
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remaining--;
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obu.has_extension = obuHasExtension(obu.header);
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obu.has_size_field = obuHasSize(obu.header);
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if (obu.has_extension) {
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if (remaining < 1) {
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WarnL << "Malformed AV1 input: expected extension header";
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return {};
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}
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obu.extension_header = *ptr++;
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remaining--;
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}
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uint64_t payload_size = 0;
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if (obu.has_size_field) {
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if (!readLeb128(ptr, remaining, payload_size)) {
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WarnL << "Malformed AV1 input: failed to read OBU size";
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return {};
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}
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if (payload_size > remaining) {
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WarnL << "Malformed AV1 input: OBU size exceeds remaining data";
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return {};
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}
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} else {
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payload_size = remaining;
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}
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obu.payload_data = ptr;
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obu.payload_size = payload_size;
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ptr += payload_size;
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remaining -= payload_size;
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int type = obuType(obu.header);
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if (type != kObuTypeTemporalDelimiter &&
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type != kObuTypeTileList &&
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type != kObuTypePadding) {
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result.push_back(obu);
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}
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}
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return result;
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}
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uint8_t AV1RtpEncoder::makeAggregationHeader(bool first_obu_is_fragment,
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bool last_obu_is_fragment,
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int num_obu_elements,
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bool starts_new_coded_video_sequence) {
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uint8_t header = 0;
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// Z bit: first OBU element is continuation of previous OBU
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if (first_obu_is_fragment) {
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header |= 0x80;
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}
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// Y bit: last OBU element will be continued in next packet
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if (last_obu_is_fragment) {
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header |= 0x40;
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}
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// W field: number of OBU elements (when <= 3)
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if (num_obu_elements <= kMaxNumObusToOmitSize) {
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header |= (num_obu_elements << 4);
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}
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// N bit: beginning of new coded video sequence
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if (starts_new_coded_video_sequence) {
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header |= 0x08;
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}
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return header;
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}
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void AV1RtpEncoder::outputRtp(const uint8_t* data, size_t len, bool mark,
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uint64_t stamp, uint8_t aggregation_header) {
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auto rtp = getRtpInfo().makeRtp(TrackVideo, nullptr, len + kAggregationHeaderSize, mark, stamp);
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auto payload = rtp->data() + RtpPacket::kRtpTcpHeaderSize + RtpPacket::kRtpHeaderSize;
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// 写入聚合头
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payload[0] = aggregation_header;
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// 复制数据
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if (len > 0) {
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memcpy(payload + kAggregationHeaderSize, data, len);
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}
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RtpCodec::inputRtp(std::move(rtp), false);
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}
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bool AV1RtpEncoder::inputFrame(const Frame::Ptr &frame) {
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auto ptr = frame->data() + frame->prefixSize();
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auto size = frame->size() - frame->prefixSize();
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if (size == 0) {
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return false;
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}
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// 解析OBU
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auto obus = parseObus((const uint8_t*)ptr, size);
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if (obus.empty()) {
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return false;
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}
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// 检查是否包含序列头(关键帧标志)
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bool has_sequence_header = false;
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for (const auto& obu : obus) {
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int type = obuType(obu.header);
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if (type == kObuTypeSequenceHeader) {
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has_sequence_header = true;
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_got_key_frame = true;
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break;
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}
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}
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// 如果还没有收到过关键帧，且当前帧不是关键帧，则丢弃
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if (!_got_key_frame && !has_sequence_header) {
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DebugL << "Dropping AV1 frame before first keyframe";
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return false;
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}
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size_t max_payload_size = getRtpInfo().getMaxSize() - kAggregationHeaderSize;
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if (max_payload_size == 0) {
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WarnL << "Invalid RTP max payload size for AV1";
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return false;
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}
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for (size_t i = 0; i < obus.size(); ++i) {
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const auto& obu = obus[i];
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bool is_first_obu = (i == 0);
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bool is_last_obu = (i == obus.size() - 1);
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if (!sendObu(obu, is_first_obu, is_last_obu,
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has_sequence_header && is_first_obu, frame->pts(), max_payload_size)) {
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return false;
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}
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}
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return true;
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}
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bool AV1RtpEncoder::sendObu(const ObuInfo& obu,
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bool is_first_obu,
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bool is_last_obu,
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bool starts_new_sequence,
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uint64_t stamp,
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size_t max_payload_size) {
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std::vector<uint8_t> obu_bytes;
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obu_bytes.reserve(1 + (obu.has_extension ? 1 : 0) + obu.payload_size);
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obu_bytes.push_back(obu.header & ~kObuSizePresentBit);
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if (obu.has_extension) {
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obu_bytes.push_back(obu.extension_header);
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}
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if (obu.payload_size > 0) {
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obu_bytes.insert(obu_bytes.end(), obu.payload_data, obu.payload_data + obu.payload_size);
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}
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size_t offset = 0;
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bool first_fragment = true;
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while (offset < obu_bytes.size()) {
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size_t fragment_size = std::min<size_t>(max_payload_size, obu_bytes.size() - offset);
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bool last_fragment = (offset + fragment_size) == obu_bytes.size();
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uint8_t agg_header = makeAggregationHeader(
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!first_fragment,
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!last_fragment,
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1,
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first_fragment && starts_new_sequence
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);
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bool mark = last_fragment && is_last_obu;
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outputRtp(obu_bytes.data() + offset, fragment_size, mark, stamp, agg_header);
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offset += fragment_size;
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first_fragment = false;
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}
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return true;
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}
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//////////////////////////////////////////////////////////////////////////
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// AV1RtpDecoder 实现
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|||
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//////////////////////////////////////////////////////////////////////////
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|||
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AV1RtpDecoder::AV1RtpDecoder() {
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obtainFrame();
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}
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void AV1RtpDecoder::obtainFrame() {
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_frame = FrameImp::create<AV1Frame>();
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}
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AV1RtpDecoder::AggregationHeader AV1RtpDecoder::parseAggregationHeader(uint8_t header) {
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AggregationHeader agg;
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agg.first_obu_is_fragment = (header & 0x80) != 0;
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agg.last_obu_is_fragment = (header & 0x40) != 0;
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agg.num_obu_elements = (header & 0x30) >> 4;
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agg.starts_new_coded_video_sequence = (header & 0x08) != 0;
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return agg;
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}
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bool AV1RtpDecoder::inputRtp(const RtpPacket::Ptr &rtp, bool key_pos) {
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auto payload_size = rtp->getPayloadSize();
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|||
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if (payload_size < kAggregationHeaderSize) {
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return false;
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}
|
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|
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uint32_t ssrc = rtp->getSSRC();
|
|||
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if (!_has_last_ssrc || _last_ssrc != ssrc) {
|
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resetState();
|
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_last_ssrc = ssrc;
|
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_has_last_ssrc = true;
|
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}
|
|||
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|
|||
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auto stamp = rtp->getStampMS();
|
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auto payload = rtp->getPayload();
|
|||
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auto seq = rtp->getSeq();
|
|||
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|
|||
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// 解析聚合头
|
|||
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auto agg_header = parseAggregationHeader(payload[0]);
|
|||
|
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|
|||
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const uint8_t* data = payload + kAggregationHeaderSize;
|
|||
|
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size_t remaining = payload_size - kAggregationHeaderSize;
|
|||
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|
|||
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// InfoL << "RTP seq=" << seq << ", Z=" << agg_header.first_obu_is_fragment
|
|||
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// << ", Y=" << agg_header.last_obu_is_fragment
|
|||
|
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// << ", W=" << agg_header.num_obu_elements
|
|||
|
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// << ", N=" << agg_header.starts_new_coded_video_sequence
|
|||
|
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// << ", payload_size=" << remaining;
|
|||
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|
|||
|
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// if (remaining > 0) {
|
|||
|
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// std::ostringstream hex_stream;
|
|||
|
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// for (size_t i = 0; i < std::min(remaining, size_t(16)); ++i) {
|
|||
|
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// hex_stream << std::hex << std::setw(2) << std::setfill('0') << (int)data[i] << " ";
|
|||
|
|
// }
|
|||
|
|
// InfoL << "RTP payload hex: " << hex_stream.str();
|
|||
|
|
// }
|
|||
|
|
|
|||
|
|
// 如果开始新的编码视频序列，清理之前的状态
|
|||
|
|
if (agg_header.starts_new_coded_video_sequence) {
|
|||
|
|
InfoL << "Starting new coded video sequence";
|
|||
|
|
resetState();
|
|||
|
|
obtainFrame();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (_has_last_seq) {
|
|||
|
|
uint16_t expected = _last_seq + 1;
|
|||
|
|
if (seq != expected && _assembling_fragment) {
|
|||
|
|
WarnL << "RTP seq gap while assembling fragment, expected=" << expected
|
|||
|
|
<< " got=" << seq << ", dropping incomplete OBU";
|
|||
|
|
_fragment_buffer.clear();
|
|||
|
|
_assembling_fragment = false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
_last_seq = seq;
|
|||
|
|
_has_last_seq = true;
|
|||
|
|
|
|||
|
|
if (!processPayload(agg_header, data, remaining)) {
|
|||
|
|
resetState();
|
|||
|
|
obtainFrame();
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
bool marker = rtp->getHeader()->mark;
|
|||
|
|
if (marker) {
|
|||
|
|
if (_assembling_fragment) {
|
|||
|
|
WarnL << "Marker bit set while awaiting fragment continuation";
|
|||
|
|
_fragment_buffer.clear();
|
|||
|
|
_assembling_fragment = false;
|
|||
|
|
}
|
|||
|
|
_last_dts = stamp;
|
|||
|
|
if (!_received_keyframe) {
|
|||
|
|
WarnL << "AV1 RTP packet before keyframe, dropping";
|
|||
|
|
_frame->_buffer.clear();
|
|||
|
|
obtainFrame();
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
flushFrame(stamp);
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
_last_dts = stamp;
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
bool AV1RtpDecoder::processPayload(const AggregationHeader& agg_header,
|
|||
|
|
const uint8_t* data,
|
|||
|
|
size_t remaining) {
|
|||
|
|
size_t element_index = 0;
|
|||
|
|
int expected_elements = agg_header.num_obu_elements;
|
|||
|
|
|
|||
|
|
while (remaining > 0) {
|
|||
|
|
uint64_t element_size = 0;
|
|||
|
|
bool has_size = (expected_elements == 0) || (static_cast<int>(element_index) < expected_elements - 1);
|
|||
|
|
if (has_size) {
|
|||
|
|
if (!readLeb128(data, remaining, element_size)) {
|
|||
|
|
WarnL << "Failed to read OBU element size, trying fallback parsing";
|
|||
|
|
// 兼容性回退：如果leb128解析失败，尝试直接使用剩余字节数
|
|||
|
|
element_size = remaining;
|
|||
|
|
} else if (element_size > remaining) {
|
|||
|
|
WarnL << "OBU element size (" << element_size << ") exceeds remaining payload ("
|
|||
|
|
<< remaining << "), using remaining size";
|
|||
|
|
element_size = remaining;
|
|||
|
|
}
|
|||
|
|
} else {
|
|||
|
|
element_size = remaining;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
std::vector<uint8_t> element_bytes;
|
|||
|
|
element_bytes.reserve(element_size);
|
|||
|
|
if (element_size > 0) {
|
|||
|
|
element_bytes.insert(element_bytes.end(), data, data + element_size);
|
|||
|
|
data += element_size;
|
|||
|
|
remaining -= element_size;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
bool is_first = element_index == 0;
|
|||
|
|
bool is_last = (remaining == 0);
|
|||
|
|
|
|||
|
|
if (is_first && agg_header.first_obu_is_fragment) {
|
|||
|
|
if (_fragment_buffer.empty()) {
|
|||
|
|
WarnL << "Unexpected fragment continuation in AV1 RTP packet";
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
_fragment_buffer.insert(_fragment_buffer.end(), element_bytes.begin(), element_bytes.end());
|
|||
|
|
} else {
|
|||
|
|
if (_assembling_fragment && !_fragment_buffer.empty()) {
|
|||
|
|
WarnL << "Previous fragment never completed, discarding";
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
_fragment_buffer = std::move(element_bytes);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
bool will_continue = is_last && agg_header.last_obu_is_fragment;
|
|||
|
|
if (will_continue) {
|
|||
|
|
_assembling_fragment = true;
|
|||
|
|
} else {
|
|||
|
|
if (!emitObu(_fragment_buffer.data(), _fragment_buffer.size())) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
_fragment_buffer.clear();
|
|||
|
|
_assembling_fragment = false;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
++element_index;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (expected_elements > 0 && static_cast<int>(element_index) != expected_elements) {
|
|||
|
|
WarnL << "Mismatch between W field (" << expected_elements
|
|||
|
|
<< ") and parsed OBU elements (" << element_index
|
|||
|
|
<< "), tolerating for compatibility";
|
|||
|
|
// 不返回false，继续处理以提高兼容性
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
bool AV1RtpDecoder::emitObu(const uint8_t* data, size_t size) {
|
|||
|
|
if (size == 0) {
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (size < 1) {
|
|||
|
|
WarnL << "Empty OBU fragment";
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
uint8_t obu_header = data[0];
|
|||
|
|
size_t header_size = 1;
|
|||
|
|
|
|||
|
|
// 检查OBU头部是否已经包含size bit
|
|||
|
|
bool already_has_size = obuHasSize(obu_header);
|
|||
|
|
|
|||
|
|
// 如果RTP包中的OBU已经包含size字段，需要特殊处理
|
|||
|
|
if (already_has_size) {
|
|||
|
|
//WarnL << "RTP OBU contains size field";
|
|||
|
|
|
|||
|
|
// 跳过extension header处理
|
|||
|
|
if (obuHasExtension(obu_header)) {
|
|||
|
|
if (size < 2) {
|
|||
|
|
WarnL << "OBU with extension flag but insufficient data";
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
header_size = 2;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 读取原始的size字段
|
|||
|
|
const uint8_t* ptr = data + header_size;
|
|||
|
|
size_t remaining = size - header_size;
|
|||
|
|
uint64_t original_size = 0;
|
|||
|
|
|
|||
|
|
if (!readLeb128(ptr, remaining, original_size)) {
|
|||
|
|
WarnL << "Failed to read original OBU size field";
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (original_size != remaining) {
|
|||
|
|
WarnL << "OBU size mismatch in RTP packet, original_size=" << original_size
|
|||
|
|
<< " remaining=" << remaining;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 直接拷贝完整的OBU（包括已有的size字段）
|
|||
|
|
_frame->_buffer.append((char*)data, size);
|
|||
|
|
} else {
|
|||
|
|
// 标准情况：RTP包中的OBU没有size字段，需要我们添加
|
|||
|
|
|
|||
|
|
// 写入带size bit的OBU头部
|
|||
|
|
_frame->_buffer.push_back(obu_header | kObuSizePresentBit);
|
|||
|
|
|
|||
|
|
if (obuHasExtension(obu_header)) {
|
|||
|
|
if (size < 2) {
|
|||
|
|
WarnL << "OBU with extension flag but insufficient data";
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
_frame->_buffer.push_back(data[1]);
|
|||
|
|
header_size = 2;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (size < header_size) {
|
|||
|
|
WarnL << "Invalid OBU size";
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 计算payload大小并写入leb128编码的size字段
|
|||
|
|
uint64_t payload_size = size - header_size;
|
|||
|
|
uint8_t size_bytes[8];
|
|||
|
|
size_t size_len = writeLeb128(payload_size, size_bytes);
|
|||
|
|
_frame->_buffer.append((char*)size_bytes, size_len);
|
|||
|
|
|
|||
|
|
// 拷贝payload数据
|
|||
|
|
if (payload_size > 0) {
|
|||
|
|
_frame->_buffer.append((char*)data + header_size, payload_size);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (obuType(obu_header) == kObuTypeSequenceHeader) {
|
|||
|
|
_received_keyframe = true;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
void AV1RtpDecoder::flushFrame(uint64_t stamp) {
|
|||
|
|
if (_frame->_buffer.empty()) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
_frame->_dts = stamp;
|
|||
|
|
_frame->_pts = stamp;
|
|||
|
|
RtpCodec::inputFrame(_frame);
|
|||
|
|
obtainFrame();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
void AV1RtpDecoder::resetState() {
|
|||
|
|
_fragment_buffer.clear();
|
|||
|
|
_assembling_fragment = false;
|
|||
|
|
_has_last_seq = false;
|
|||
|
|
_received_keyframe = false;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
} // namespace mediakit
|