欢迎您访问 最编程 本站为您分享编程语言代码，编程技术文章！

热门搜索/Hot Search

您现在的位置是： 首页

让FFmpeg支持RTMP推流H265：如何修改源码？

最编程 2024-01-31 08:24:12
...

背景

RTMP本身不支持H265推流，仅支持H264.因此需要修改FFmpeg源码支持推流


FFmpeg新增FLV编码格式定义

HEVC为视频编码格式，因此对FLV规范的扩展，只集中在Video Tag，其它部分，无任何改动。

1.CodecID - 定义HEVC格式的值为12；

2.HEVCPacketType - 当CodecID == 12时，AVCPacketType为HEVCPacketType：

  • 如果HEVCPacketType为0，表示HEVCVIDEOPACKET中存放的是HEVC sequence header；
  • 如果HEVCPacketType为1，表示HEVCVIDEOPACKET中存放的是HEVC NALU；
  • 如果HEVCPacketType为2，表示HEVCVIDEPACKET中存放的是HEVC end of sequence，即HEVCDecoderConfigurationRecord；

3.CompositionTime - 当CodecID == 12时，同样需要CompositionTime。

当CodecID为12时，VideoTagBody中存放的就是HEVC视频帧内容。

FFmpeg修改源码支持RTMP推流H265_HEVC在RTMP中的扩展


FFmpeg版本3.2


修改的相关细节

FFmpeg3.2 msvc+msys 源码编译_宁静致远的技术博客_51CTO博客

源码修改细节

diff --git a/libavformat/flv.h b/libavformat/flv.h
index df5ce3d..97324cc 100755
--- a/libavformat/flv.h
+++ b/libavformat/flv.h
@@ -109,6 +109,7 @@ enum {
     FLV_CODECID_H264    = 7,
     FLV_CODECID_REALH263= 8,
     FLV_CODECID_MPEG4   = 9,
+    FLV_CODECID_HEVC    = 12,
 };
 
 enum {
diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index 34c3e08..060e7d2 100755
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -36,6 +36,7 @@
 #include "internal.h"
 #include "avio_internal.h"
 #include "flv.h"
+#include "hevc.h"
 
 #define VALIDATE_INDEX_TS_THRESH 2500
 
@@ -291,6 +292,8 @@ static int flv_same_video_codec(AVCodecParameters *vpar, int flags)
         return vpar->codec_id == AV_CODEC_ID_VP6A;
     case FLV_CODECID_H264:
         return vpar->codec_id == AV_CODEC_ID_H264;
+    case FLV_CODECID_HEVC:
+        return vpar->codec_id == AV_CODEC_ID_HEVC;
     default:
         return vpar->codec_tag == flv_codecid;
     }
@@ -336,6 +339,10 @@ static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream,
         vstream->need_parsing = AVSTREAM_PARSE_HEADERS;
         ret = 3;     // not 4, reading packet type will consume one byte
         break;
+    case FLV_CODECID_HEVC:
+        par->codec_id = AV_CODEC_ID_HEVC;
+        vstream->need_parsing = AVSTREAM_PARSE_HEADERS;
+        return 3;     // not 4, reading packet type will consume one byte
     case FLV_CODECID_MPEG4:
         par->codec_id = AV_CODEC_ID_MPEG4;
         ret = 3;
@@ -1151,7 +1158,8 @@ retry_duration:
 
     if (st->codecpar->codec_id == AV_CODEC_ID_AAC ||
         st->codecpar->codec_id == AV_CODEC_ID_H264 ||
-        st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
+        st->codecpar->codec_id == AV_CODEC_ID_MPEG4 ||
+        st->codecpar->codec_id == AV_CODEC_ID_HEVC) {
         int type = avio_r8(s->pb);
         size--;
 
@@ -1160,7 +1168,8 @@ retry_duration:
             goto leave;
         }
 
-        if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
+        if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4
+            || st->codecpar->codec_id == AV_CODEC_ID_HEVC) {
             // sign extension
             int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;
             pts = dts + cts;
@@ -1176,7 +1185,7 @@ retry_duration:
             }
         }
         if (type == 0 && (!st->codecpar->extradata || st->codecpar->codec_id == AV_CODEC_ID_AAC ||
-            st->codecpar->codec_id == AV_CODEC_ID_H264)) {
+            st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_HEVC)) {
             AVDictionaryEntry *t;
 
             if (st->codecpar->extradata) {
diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
index e8af48c..e3ff84f 100755
--- a/libavformat/flvenc.c
+++ b/libavformat/flvenc.c
@@ -34,7 +34,7 @@
 #include "libavutil/opt.h"
 #include "libavcodec/put_bits.h"
 #include "libavcodec/aacenctab.h"
-
+#include "libavformat/hevc.h"
 
 static const AVCodecTag flv_video_codec_ids[] = {
     { AV_CODEC_ID_FLV1,     FLV_CODECID_H263 },
@@ -46,6 +46,7 @@ static const AVCodecTag flv_video_codec_ids[] = {
     { AV_CODEC_ID_VP6,      FLV_CODECID_VP6 },
     { AV_CODEC_ID_VP6A,     FLV_CODECID_VP6A },
     { AV_CODEC_ID_H264,     FLV_CODECID_H264 },
+    { AV_CODEC_ID_HEVC,     FLV_CODECID_HEVC },
     { AV_CODEC_ID_NONE,     0 }
 };
 
@@ -485,7 +486,7 @@ static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par) {
     AVIOContext *pb = s->pb;
     FLVContext *flv = s->priv_data;
 
-    if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
+    if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_HEVC
             || par->codec_id == AV_CODEC_ID_MPEG4) {
         int64_t pos;
         avio_w8(pb,
@@ -533,7 +534,12 @@ static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par) {
             avio_w8(pb, par->codec_tag | FLV_FRAME_KEY); // flags
             avio_w8(pb, 0); // AVC sequence header
             avio_wb24(pb, 0); // composition time
-            ff_isom_write_avcc(pb, par->extradata, par->extradata_size);
+            if (par->codec_id == AV_CODEC_ID_HEVC)
+                    ff_isom_write_hvcc(pb, par->extradata, par->extradata_size, 0);
+                else
+                    ff_isom_write_avcc(pb, par->extradata, par->extradata_size);
+// liangliang
+            // ff_isom_write_avcc(pb, par->extradata, par->extradata_size);
         }
         data_size = avio_tell(pb) - pos;
         avio_seek(pb, -data_size - 10, SEEK_CUR);
@@ -836,7 +842,7 @@ end:
             AVCodecParameters *par = s->streams[i]->codecpar;
             FLVStreamContext *sc = s->streams[i]->priv_data;
             if (par->codec_type == AVMEDIA_TYPE_VIDEO &&
-                    (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4))
+                    (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC))
                 put_avc_eos_tag(pb, sc->last_ts);
         }
     }
@@ -882,12 +888,13 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
     if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A ||
         par->codec_id == AV_CODEC_ID_VP6  || par->codec_id == AV_CODEC_ID_AAC)
         flags_size = 2;
-    else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4)
+    else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 ||
+             par->codec_id == AV_CODEC_ID_HEVC)
         flags_size = 5;
     else
         flags_size = 1;
 
-    if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
+    if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_HEVC
             || par->codec_id == AV_CODEC_ID_MPEG4) {
         int side_size = 0;
         uint8_t *side = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &side_size);
@@ -951,7 +958,11 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
         if (par->extradata_size > 0 && *(uint8_t*)par->extradata != 1)
             if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
                 return ret;
-    } else if (par->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
+    } else if (par->codec_id == AV_CODEC_ID_HEVC) {
+        if (par->extradata_size > 0 && *(uint8_t*)par->extradata != 1)
+             if ((ret = ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL)) < 0)
+                 return ret;
+     } else if (par->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
                (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
         if (!s->streams[pkt->stream_index]->nb_frames) {
         av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
@@ -1023,7 +1034,8 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
                              (FFALIGN(par->height, 16) - par->height));
         } else if (par->codec_id == AV_CODEC_ID_AAC)
             avio_w8(pb, 1); // AAC raw
-        else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
+        else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 ||
+                 par->codec_id == AV_CODEC_ID_HEVC) {
             avio_w8(pb, 1); // AVC NALU
             avio_wb24(pb, pkt->pts - pkt->dts);
         }

注意事项

调用FFmpeg接口推流的时候，需要将VPS/SPS/PPS信息填充AVCodecParameters *codecpar;结构体中的uint8_t *extradata;



上一篇： 全面解析：YUV、RGB、H264与RTSP的综合应用

下一篇： 全面解析音视频编码原理和H264码流细节：深入理解H264分层技术

推荐阅读