mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-22 10:40:05 +08:00
410 lines
13 KiB
C++
410 lines
13 KiB
C++
/*
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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 "H264.h"
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#include "H264Rtmp.h"
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#include "H264Rtp.h"
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#include "SPSParser.h"
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#include "Util/logger.h"
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#include "Util/base64.h"
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#include "Common/Parser.h"
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#include "Common/config.h"
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#include "Extension/Factory.h"
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#ifdef ENABLE_MP4
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#include "mpeg4-avc.h"
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#endif
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using namespace std;
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using namespace toolkit;
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namespace mediakit {
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static bool getAVCInfo(const char *sps, size_t sps_len, int &iVideoWidth, int &iVideoHeight, float &iVideoFps) {
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if (sps_len < 4) {
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return false;
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}
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T_GetBitContext tGetBitBuf;
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T_SPS tH264SpsInfo;
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memset(&tGetBitBuf, 0, sizeof(tGetBitBuf));
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memset(&tH264SpsInfo, 0, sizeof(tH264SpsInfo));
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tGetBitBuf.pu8Buf = (uint8_t *)sps + 1;
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tGetBitBuf.iBufSize = (int)(sps_len - 1);
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if (0 != h264DecSeqParameterSet((void *)&tGetBitBuf, &tH264SpsInfo)) {
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return false;
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}
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h264GetWidthHeight(&tH264SpsInfo, &iVideoWidth, &iVideoHeight);
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h264GeFramerate(&tH264SpsInfo, &iVideoFps);
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// ErrorL << iVideoWidth << " " << iVideoHeight << " " << iVideoFps;
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return true;
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}
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bool getAVCInfo(const string &strSps, int &iVideoWidth, int &iVideoHeight, float &iVideoFps) {
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return getAVCInfo(strSps.data(), strSps.size(), iVideoWidth, iVideoHeight, iVideoFps);
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}
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static const char *memfind(const char *buf, ssize_t len, const char *subbuf, ssize_t sublen) {
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for (auto i = 0; i < len - sublen; ++i) {
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if (memcmp(buf + i, subbuf, sublen) == 0) {
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return buf + i;
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}
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}
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return NULL;
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}
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void splitH264(
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const char *ptr, size_t len, size_t prefix, const std::function<void(const char *, size_t, size_t)> &cb) {
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auto start = ptr + prefix;
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auto end = ptr + len;
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size_t next_prefix;
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while (true) {
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auto next_start = memfind(start, end - start, "\x00\x00\x01", 3);
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if (next_start) {
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//找到下一帧
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if (*(next_start - 1) == 0x00) {
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//这个是00 00 00 01开头
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next_start -= 1;
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next_prefix = 4;
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} else {
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//这个是00 00 01开头
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next_prefix = 3;
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}
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//记得加上本帧prefix长度
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cb(start - prefix, next_start - start + prefix, prefix);
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//搜索下一帧末尾的起始位置
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start = next_start + next_prefix;
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//记录下一帧的prefix长度
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prefix = next_prefix;
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continue;
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}
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//未找到下一帧,这是最后一帧
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cb(start - prefix, end - start + prefix, prefix);
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break;
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}
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}
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size_t prefixSize(const char *ptr, size_t len) {
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if (len < 4) {
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return 0;
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}
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if (ptr[0] != 0x00 || ptr[1] != 0x00) {
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//不是0x00 00开头
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return 0;
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}
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if (ptr[2] == 0x00 && ptr[3] == 0x01) {
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//是0x00 00 00 01
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return 4;
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}
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if (ptr[2] == 0x01) {
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//是0x00 00 01
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return 3;
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}
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return 0;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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H264Track::H264Track(const string &sps, const string &pps, int sps_prefix_len, int pps_prefix_len) {
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_sps = sps.substr(sps_prefix_len);
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_pps = pps.substr(pps_prefix_len);
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update();
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}
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CodecId H264Track::getCodecId() const {
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return CodecH264;
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}
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int H264Track::getVideoHeight() const {
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return _height;
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}
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int H264Track::getVideoWidth() const {
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return _width;
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}
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float H264Track::getVideoFps() const {
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return _fps;
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}
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bool H264Track::ready() const {
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return !_sps.empty() && !_pps.empty();
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}
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bool H264Track::inputFrame(const Frame::Ptr &frame) {
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using H264FrameInternal = FrameInternal<H264FrameNoCacheAble>;
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int type = H264_TYPE(frame->data()[frame->prefixSize()]);
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if ((type == H264Frame::NAL_B_P || type == H264Frame::NAL_IDR) && ready()) {
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return inputFrame_l(frame);
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}
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//非I/B/P帧情况下，split一下，防止多个帧粘合在一起
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bool ret = false;
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splitH264(frame->data(), frame->size(), frame->prefixSize(), [&](const char *ptr, size_t len, size_t prefix) {
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H264FrameInternal::Ptr sub_frame = std::make_shared<H264FrameInternal>(frame, (char *)ptr, len, prefix);
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if (inputFrame_l(sub_frame)) {
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ret = true;
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}
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});
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return ret;
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}
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toolkit::Buffer::Ptr H264Track::getExtraData() const {
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CHECK(ready());
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#ifdef ENABLE_MP4
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struct mpeg4_avc_t avc;
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memset(&avc, 0, sizeof(avc));
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string sps_pps = string("\x00\x00\x00\x01", 4) + _sps + string("\x00\x00\x00\x01", 4) + _pps;
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h264_annexbtomp4(&avc, sps_pps.data(), (int)sps_pps.size(), NULL, 0, NULL, NULL);
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std::string extra_data;
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extra_data.resize(1024);
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auto extra_data_size = mpeg4_avc_decoder_configuration_record_save(&avc, (uint8_t *)extra_data.data(), extra_data.size());
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if (extra_data_size == -1) {
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WarnL << "生成H264 extra_data 失败";
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return nullptr;
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}
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extra_data.resize(extra_data_size);
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return std::make_shared<BufferString>(std::move(extra_data));
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#else
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std::string extra_data;
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// AVCDecoderConfigurationRecord start
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extra_data.push_back(1); // version
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extra_data.push_back(_sps[1]); // profile
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extra_data.push_back(_sps[2]); // compat
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extra_data.push_back(_sps[3]); // level
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extra_data.push_back((char)0xff); // 6 bits reserved + 2 bits nal size length - 1 (11)
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extra_data.push_back((char)0xe1); // 3 bits reserved + 5 bits number of sps (00001)
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// sps
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uint16_t size = (uint16_t)_sps.size();
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size = htons(size);
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extra_data.append((char *)&size, 2);
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extra_data.append(_sps);
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// pps
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extra_data.push_back(1); // version
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size = (uint16_t)_pps.size();
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size = htons(size);
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extra_data.append((char *)&size, 2);
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extra_data.append(_pps);
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return std::make_shared<BufferString>(std::move(extra_data));
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#endif
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}
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void H264Track::setExtraData(const uint8_t *data, size_t bytes) {
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#ifdef ENABLE_MP4
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struct mpeg4_avc_t avc;
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memset(&avc, 0, sizeof(avc));
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if (mpeg4_avc_decoder_configuration_record_load(data, bytes, &avc) > 0) {
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std::vector<uint8_t> config(bytes * 2);
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int size = mpeg4_avc_to_nalu(&avc, config.data(), bytes * 2);
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if (size > 4) {
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splitH264((char *)config.data(), size, 4, [&](const char *ptr, size_t len, size_t prefix) {
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inputFrame_l(std::make_shared<H264FrameNoCacheAble>((char *)ptr, len, 0, 0, prefix));
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});
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update();
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}
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}
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#else
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CHECK(bytes >= 8); // 6 + 2
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size_t offset = 6;
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uint16_t sps_size = data[offset] << 8 | data[offset + 1];
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auto sps_ptr = data + offset + 2;
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offset += (2 + sps_size);
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CHECK(bytes >= offset + 2); // + pps_size
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_sps.assign((char *)sps_ptr, sps_size);
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uint16_t pps_size = data[offset] << 8 | data[offset + 1];
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auto pps_ptr = data + offset + 2;
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offset += (2 + pps_size);
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CHECK(bytes >= offset);
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_pps.assign((char *)pps_ptr, pps_size);
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update();
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#endif
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}
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bool H264Track::update() {
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return getAVCInfo(_sps, _width, _height, _fps);
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}
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Track::Ptr H264Track::clone() const {
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return std::make_shared<H264Track>(*this);
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}
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bool H264Track::inputFrame_l(const Frame::Ptr &frame) {
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int type = H264_TYPE(frame->data()[frame->prefixSize()]);
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bool ret = true;
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switch (type) {
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case H264Frame::NAL_SPS: {
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_sps = string(frame->data() + frame->prefixSize(), frame->size() - frame->prefixSize());
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_latest_is_config_frame = true;
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ret = VideoTrack::inputFrame(frame);
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break;
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}
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case H264Frame::NAL_PPS: {
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_pps = string(frame->data() + frame->prefixSize(), frame->size() - frame->prefixSize());
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_latest_is_config_frame = true;
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ret = VideoTrack::inputFrame(frame);
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break;
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}
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default:
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// 避免识别不出关键帧
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if (_latest_is_config_frame && !frame->dropAble()) {
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if (!frame->keyFrame()) {
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const_cast<Frame::Ptr &>(frame) = std::make_shared<FrameCacheAble>(frame, true);
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}
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}
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// 判断是否是I帧, 并且如果是,那判断前面是否插入过config帧, 如果插入过就不插入了
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if (frame->keyFrame() && !_latest_is_config_frame) {
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insertConfigFrame(frame);
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}
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if(!frame->dropAble()){
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_latest_is_config_frame = false;
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}
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ret = VideoTrack::inputFrame(frame);
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break;
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}
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if (_width == 0 && ready()) {
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update();
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}
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return ret;
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}
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void H264Track::insertConfigFrame(const Frame::Ptr &frame) {
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if (!_sps.empty()) {
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auto spsFrame = FrameImp::create<H264Frame>();
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spsFrame->_prefix_size = 4;
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spsFrame->_buffer.assign("\x00\x00\x00\x01", 4);
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spsFrame->_buffer.append(_sps);
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spsFrame->_dts = frame->dts();
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spsFrame->setIndex(frame->getIndex());
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VideoTrack::inputFrame(spsFrame);
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}
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if (!_pps.empty()) {
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auto ppsFrame = FrameImp::create<H264Frame>();
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ppsFrame->_prefix_size = 4;
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ppsFrame->_buffer.assign("\x00\x00\x00\x01", 4);
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ppsFrame->_buffer.append(_pps);
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ppsFrame->_dts = frame->dts();
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ppsFrame->setIndex(frame->getIndex());
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VideoTrack::inputFrame(ppsFrame);
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}
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}
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class H264Sdp : public Sdp {
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public:
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H264Sdp(const string &strSPS, const string &strPPS, int payload_type, int bitrate) : Sdp(90000, payload_type) {
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_printer << "m=video 0 RTP/AVP " << payload_type << "\r\n";
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if (bitrate) {
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_printer << "b=AS:" << bitrate << "\r\n";
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}
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_printer << "a=rtpmap:" << payload_type << " " << getCodecName(CodecH264) << "/" << 90000 << "\r\n";
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/**
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Single NAI Unit Mode = 0. // Single NAI mode (Only nals from 1-23 are allowed)
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Non Interleaved Mode = 1，// Non-interleaved Mode: 1-23，24 (STAP-A)，28 (FU-A) are allowed
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Interleaved Mode = 2, // 25 (STAP-B)，26 (MTAP16)，27 (MTAP24)，28 (EU-A)，and 29 (EU-B) are allowed.
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**/
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GET_CONFIG(bool, h264_stap_a, Rtp::kH264StapA);
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_printer << "a=fmtp:" << payload_type << " packetization-mode=" << h264_stap_a << "; profile-level-id=";
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uint32_t profile_level_id = 0;
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if (strSPS.length() >= 4) { // sanity check
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profile_level_id = (uint8_t(strSPS[1]) << 16) |
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(uint8_t(strSPS[2]) << 8) |
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(uint8_t(strSPS[3])); // profile_idc|constraint_setN_flag|level_idc
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}
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char profile[8];
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snprintf(profile, sizeof(profile), "%06X", profile_level_id);
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_printer << profile;
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_printer << "; sprop-parameter-sets=";
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_printer << encodeBase64(strSPS) << ",";
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_printer << encodeBase64(strPPS) << "\r\n";
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}
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string getSdp() const { return _printer; }
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private:
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_StrPrinter _printer;
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};
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Sdp::Ptr H264Track::getSdp(uint8_t payload_type) const {
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if (!ready()) {
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WarnL << getCodecName() << " Track未准备好";
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return nullptr;
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}
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return std::make_shared<H264Sdp>(_sps, _pps, payload_type, getBitRate() / 1024);
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}
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namespace {
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CodecId getCodec() {
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return CodecH264;
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}
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Track::Ptr getTrackByCodecId(int sample_rate, int channels, int sample_bit) {
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return std::make_shared<H264Track>();
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}
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Track::Ptr getTrackBySdp(const SdpTrack::Ptr &track) {
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//a=fmtp:96 packetization-mode=1;profile-level-id=42C01F;sprop-parameter-sets=Z0LAH9oBQBboQAAAAwBAAAAPI8YMqA==,aM48gA==
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auto map = Parser::parseArgs(track->_fmtp, ";", "=");
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auto sps_pps = map["sprop-parameter-sets"];
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string base64_SPS = findSubString(sps_pps.data(), NULL, ",");
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string base64_PPS = findSubString(sps_pps.data(), ",", NULL);
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auto sps = decodeBase64(base64_SPS);
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auto pps = decodeBase64(base64_PPS);
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if (sps.empty() || pps.empty()) {
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//如果sdp里面没有sps/pps,那么可能在后续的rtp里面恢复出sps/pps
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return std::make_shared<H264Track>();
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}
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return std::make_shared<H264Track>(sps, pps, 0, 0);
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}
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RtpCodec::Ptr getRtpEncoderByCodecId(uint8_t pt) {
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return std::make_shared<H264RtpEncoder>();
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}
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RtpCodec::Ptr getRtpDecoderByCodecId() {
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return std::make_shared<H264RtpDecoder>();
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}
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RtmpCodec::Ptr getRtmpEncoderByTrack(const Track::Ptr &track) {
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return std::make_shared<H264RtmpEncoder>(track);
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}
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RtmpCodec::Ptr getRtmpDecoderByTrack(const Track::Ptr &track) {
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return std::make_shared<H264RtmpDecoder>(track);
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}
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Frame::Ptr getFrameFromPtr(const char *data, size_t bytes, uint64_t dts, uint64_t pts) {
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return std::make_shared<H264FrameNoCacheAble>((char *)data, bytes, dts, pts, prefixSize(data, bytes));
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}
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} // namespace
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CodecPlugin h264_plugin = { getCodec,
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getTrackByCodecId,
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getTrackBySdp,
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getRtpEncoderByCodecId,
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getRtpDecoderByCodecId,
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getRtmpEncoderByTrack,
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getRtmpDecoderByTrack,
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getFrameFromPtr };
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} // namespace mediakit
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