feat: add support of codec plugin

ext-codec/H264Rtmp.cpp

@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
+ *
+ * This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
+ *
+ * Use of this source code is governed by MIT-like license that can be found in the
+ * LICENSE file in the root of the source tree. All contributing project authors
+ * may be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "Rtmp/utils.h"
+#include "H264Rtmp.h"
+
+using namespace std;
+using namespace toolkit;
+
+namespace mediakit {
+
+void H264RtmpDecoder::inputRtmp(const RtmpPacket::Ptr &pkt) {
+    if (pkt->isConfigFrame()) {
+        CHECK(pkt->size() > 5);
+        getTrack()->setExtraData((uint8_t *)pkt->data() + 5, pkt->size() - 5);
+        return;
+    }
+
+    CHECK(pkt->size() > 9);
+    uint8_t *cts_ptr = (uint8_t *)(pkt->buffer.data() + 2);
+    int32_t cts = (((cts_ptr[0] << 16) | (cts_ptr[1] << 8) | (cts_ptr[2])) + 0xff800000) ^ 0xff800000;
+    auto pts = pkt->time_stamp + cts;
+    splitFrame((uint8_t *)pkt->data() + 5, pkt->size() - 5, pkt->time_stamp, pts);
+}
+
+void H264RtmpDecoder::splitFrame(const uint8_t *data, size_t size, uint32_t dts, uint32_t pts) {
+    auto end = data + size;
+    while (data + 4 < end) {
+        uint32_t frame_len = load_be32(data);
+        data += 4;
+        if (data + frame_len > end) {
+            break;
+        }
+        outputFrame((const char *)data, frame_len, dts, pts);
+        data += frame_len;
+    }
+}
+
+void H264RtmpDecoder::outputFrame(const char *data, size_t len, uint32_t dts, uint32_t pts) {
+    auto frame = FrameImp::create<H264Frame>();
+    frame->_prefix_size = 4;
+    frame->_dts = dts;
+    frame->_pts = pts;
+    frame->_buffer.assign("\x00\x00\x00\x01", 4); // 添加264头
+    frame->_buffer.append(data, len);
+    RtmpCodec::inputFrame(frame);
+}
+
+////////////////////////////////////////////////////////////////////////
+
+void H264RtmpEncoder::flush() {
+    inputFrame(nullptr);
+}
+
+bool H264RtmpEncoder::inputFrame(const Frame::Ptr &frame) {
+    if (!_rtmp_packet) {
+        _rtmp_packet = RtmpPacket::create();
+        //flags/not config/cts预占位
+        _rtmp_packet->buffer.resize(5);
+    }
+
+    return _merger.inputFrame(frame, [this](uint64_t dts, uint64_t pts, const Buffer::Ptr &, bool have_key_frame) {
+            // flags
+            _rtmp_packet->buffer[0] = (uint8_t)RtmpVideoCodec::h264 | ((uint8_t)(have_key_frame ? RtmpFrameType::key_frame : RtmpFrameType::inter_frame) << 4);
+            _rtmp_packet->buffer[1] = (uint8_t)RtmpH264PacketType::h264_nalu;
+            int32_t cts = pts - dts;
+            // cts
+            set_be24(&_rtmp_packet->buffer[2], cts);
+            _rtmp_packet->time_stamp = dts;
+            _rtmp_packet->body_size = _rtmp_packet->buffer.size();
+            _rtmp_packet->chunk_id = CHUNK_VIDEO;
+            _rtmp_packet->stream_index = STREAM_MEDIA;
+            _rtmp_packet->type_id = MSG_VIDEO;
+            // 输出rtmp packet
+            RtmpCodec::inputRtmp(_rtmp_packet);
+            _rtmp_packet = nullptr;
+        }, &_rtmp_packet->buffer);
+}
+
+void H264RtmpEncoder::makeConfigPacket() {
+    auto flags = (uint8_t)RtmpVideoCodec::h264;
+    flags |= ((uint8_t)RtmpFrameType::key_frame << 4);
+    auto pkt = RtmpPacket::create();
+    // header
+    pkt->buffer.push_back(flags);
+    pkt->buffer.push_back((uint8_t)RtmpH264PacketType::h264_config_header);
+    // cts
+    pkt->buffer.append("\x0\x0\x0", 3);
+    // AVCDecoderConfigurationRecord start
+    auto extra_data = getTrack()->getExtraData();
+    CHECK(extra_data);
+    pkt->buffer.append(extra_data->data(), extra_data->size());
+
+    pkt->body_size = pkt->buffer.size();
+    pkt->chunk_id = CHUNK_VIDEO;
+    pkt->stream_index = STREAM_MEDIA;
+    pkt->time_stamp = 0;
+    pkt->type_id = MSG_VIDEO;
+    RtmpCodec::inputRtmp(pkt);
+}
+
+}//namespace mediakit