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安卓 webrtc 开启 h264 软编解码

[TOC]

本文首发地址 https://blog.csdn.net/CSqingchen/article/details/120199702
最新更新地址 https://gitee.com/chenjim/chenjimblog
本文基于libmediasoupclient 3.2.0 和 webrtc branch-heads/4147(m84)
本文得熟悉相关基础,参考 文1文2
除了需要加编译参数 rtc_use_h264=true, 还需要以下修改以支持h264软编解码
网络搜索到的有很多复制、粘贴,缺少部分内容的,或者版本环境不匹配,很让人头疼。。。。

1. 修改 ffmpeg_generated.gni 开启 openh264 编解码

安卓平台默认未支持 h264 解码,会显示黑屏
third_party/ffmpeg/ffmpeg_generated.gni 中我们可以开到,默认未支持安卓平台
修改 ffmpeg_generated.gniuse_linux_config,添加 || is_android以支持,结果如下
use_linux_config = is_linux || is_fuchsia || is_android
参考自 https://www.codeleading.com/article/3215969775
而对于软编解码,android webrtc采用openh264 +ffmpeg,这两块的代码都在webrtc源码src/third_party当中

2. 增加 codec_list parser_list h264 支持

third_party/ffmpeg/chromium/config/Chrome/android/arm64/libavcodec/parser_list.c 中添加 &ff_h264_parser,
third_party/ffmpeg/chromium/config/Chrome/android/arm64/libavcodec/codec_list.c 中添加 &ff_h264_decoder,
third_party/ffmpeg/chromium/config/下有 Chrome ChromeOS Chromium,这里用的是 Chrome,(其它可能有问题。。。)
需要在编译参数添加 ffmpeg_branding="Chrome"
这里路径 android/arm64 是需要配合参数 --arch "arm64-v8a",
如果是 armeabi-v7a 需要同步修改目录 android/arm-neon/libavcodec下内容,
最终编译参数参考:
./tools_webrtc/android/build_aar.py --extra-gn-args 'rtc_use_h264=true ffmpeg_branding="Chrome" rtc_enable_protobuf=false use_rtti=true use_custom_libcxx=false' --arch "arm64-v8a"

3. 增加文件 LibH264Decoder.java

复制 sdk/android/api/org/webrtc/LibvpxVp8Decoder.java为同目录 LibH264Decoder.java,修改后如下:

package org.webrtc;
public class LibH264Decoder extends WrappedNativeVideoDecoder {
  @Override
  public long createNativeVideoDecoder() {
    return nativeCreateDecoder();
  }
  static native long nativeCreateDecoder();
}

4. 增加文件 LibH264Encoder.java

复制 sdk/android/api/org/webrtc/LibvpxVp8Encoder.java 为同目录 LibH264Encoder.java,修改后如下:

package org.webrtc;
public class LibH264Encoder extends WrappedNativeVideoEncoder {
  @Override
  public long createNativeVideoEncoder() {
    return nativeCreateEncoder();
  }
  static native long nativeCreateEncoder();
  @Override
  public boolean isHardwareEncoder() {return false;}
}

5. 增加 h264_codec.cc

复制 sdk/android/src/jni/vp8_codec.cc 为同目录 h264_codec.cc,修改后如下:

#include <jni.h>
#include "modules/video_coding/codecs/h264/include/h264.h"
#include "sdk/android/generated_libH264_jni/LibH264Decoder_jni.h"
#include "sdk/android/generated_libH264_jni/LibH264Encoder_jni.h"
#include "sdk/android/src/jni/jni_helpers.h"
namespace webrtc {
namespace jni {
static jlong JNI_LibH264Encoder_CreateEncoder(JNIEnv* jni) {
  return jlongFromPointer(H264Encoder::Create().release());
}
static jlong JNI_LibH264Decoder_CreateDecoder(JNIEnv* jni) {
  return jlongFromPointer(H264Decoder::Create().release());
}
}  // namespace jni
}  // namespace webrtc

6. 修改H264 Create()

添加上面要用到的 H264Encoder::Create(),修改 diff 如下:

--- a/modules/video_coding/codecs/h264/h264.cc
+++ b/modules/video_coding/codecs/h264/h264.cc
@@ -84,6 +84,16 @@ std::vector<SdpVideoFormat> SupportedH264Codecs() {
                        "0")};
}

+std::unique_ptr<H264Encoder> H264Encoder::Create() {
+#if defined(WEBRTC_USE_H264)
+  RTC_LOG(LS_INFO) << "Creating H264EncoderImpl.";
+  return std::make_unique<H264EncoderImpl>(cricket::VideoCodec("H264"));
+#else
+      RTC_NOTREACHED();
+      return nullptr;
+#endif
+    }
+
std::unique_ptr<H264Encoder> H264Encoder::Create(
    const cricket::VideoCodec& codec) {
  RTC_DCHECK(H264Encoder::IsSupported());

--- a/modules/video_coding/codecs/h264/include/h264.h
+++ b/modules/video_coding/codecs/h264/include/h264.h
@@ -43,6 +43,7 @@ std::vector<SdpVideoFormat> SupportedH264Codecs();

class RTC_EXPORT H264Encoder : public VideoEncoder {
  public:
+  static std::unique_ptr<H264Encoder> Create();
  static std::unique_ptr<H264Encoder> Create(const cricket::VideoCodec& codec);
  // If H.264 is supported (any implementation).
  static bool IsSupported();

7. 修改 sdk/android/BUILD.gn

将其中 vp8 相关地方复制添加 h264 相关,我的一份修改 diff 如下,若编译有问题或者无效,需仔细核对此处。。。

@@ -45,6 +45,7 @@ if (is_android) {
      ":java_audio_device_module_java",
      ":libjingle_peerconnection_java",
      ":libjingle_peerconnection_metrics_default_java",
+      ":libH264_java",
      ":libvpx_vp8_java",
      ":libvpx_vp9_java",
      ":logging_java",
@@ -489,6 +490,20 @@ if (is_android) {
    ]
  }

+  rtc_android_library("libH264_java") {
+    visibility = [ "*" ]
+    sources = [
+      "api/org/webrtc/LibH264Decoder.java",
+      "api/org/webrtc/LibH264Encoder.java",
+    ]
+    deps = [
+      ":base_java",
+      ":video_api_java",
+      ":video_java",
+      "//rtc_base:base_java",
+    ]
+  }
+
  rtc_android_library("libvpx_vp9_java") {
    visibility = [ "*" ]
    sources = [
@@ -512,6 +527,7 @@ if (is_android) {

    deps = [
      ":base_java",
+      ":libH264_java",
      ":libvpx_vp8_java",
      ":libvpx_vp9_java",
      ":video_api_java",
@@ -783,6 +799,18 @@ if (current_os == "linux" || is_android) {
    ]
  }

+ rtc_library("libH264_jni") {
+    visibility = [ "*" ]
+    allow_poison = [ "software_video_codecs" ]
+    sources = [ "src/jni/h264_codec.cc" ]
+    deps = [
+      ":base_jni",
+      ":generated_libH264_jni",
+      ":video_jni",
+      "../../modules/video_coding:webrtc_h264",
+    ]
+  }
+
  rtc_library("libvpx_vp9_jni") {
    visibility = [ "*" ]
    allow_poison = [ "software_video_codecs" ]
@@ -799,6 +827,7 @@ if (current_os == "linux" || is_android) {
    visibility = [ "*" ]
    allow_poison = [ "software_video_codecs" ]
    deps = [
+      ":libH264_jni",
      ":libvpx_vp8_jni",
      ":libvpx_vp9_jni",
    ]
@@ -1203,6 +1232,16 @@ if (current_os == "linux" || is_android) {
    jni_generator_include = "//sdk/android/src/jni/jni_generator_helper.h"
  }

+  generate_jni("generated_libH264_jni") {
+    sources = [
+      "api/org/webrtc/LibH264Decoder.java",
+      "api/org/webrtc/LibH264Encoder.java",
+    ]
+
+    namespace = "webrtc::jni"
+    jni_generator_include = "//sdk/android/src/jni/jni_generator_helper.h"
+  }
+
  generate_jni("generated_libvpx_vp9_jni") {
    sources = [
      "api/org/webrtc/LibvpxVp9Decoder.java",

8. 修改 SoftwareVideoDecoderFacoty.java 和 SoftwareVideoEncoderFacoty.java

需要 分别注册 H.264 并添加创建 codec 的代码, 我的修改 DIFF 如下

--- a/sdk/android/api/org/webrtc/SoftwareVideoDecoderFactory.java
+++ b/sdk/android/api/org/webrtc/SoftwareVideoDecoderFactory.java
@@ -26,6 +26,10 @@ public class SoftwareVideoDecoderFactory implements VideoDecoderFactory {
  @Nullable
  @Override
  public VideoDecoder createDecoder(VideoCodecInfo codecType) {
+    if (codecType.getName().equalsIgnoreCase("H264")) {
+      return new LibH264Decoder();
+    }
+
    if (codecType.getName().equalsIgnoreCase("VP8")) {
      return new LibvpxVp8Decoder();
    }
@@ -45,6 +49,9 @@ public class SoftwareVideoDecoderFactory implements VideoDecoderFactory {
    List<VideoCodecInfo> codecs = new ArrayList<VideoCodecInfo>();

    codecs.add(new VideoCodecInfo("VP8", new HashMap<>()));
+
+    codecs.add(new VideoCodecInfo("H264", new HashMap<>()));
+
    if (LibvpxVp9Decoder.nativeIsSupported()) {
      codecs.add(new VideoCodecInfo("VP9", new HashMap<>()));
    }

--- a/sdk/android/api/org/webrtc/SoftwareVideoEncoderFactory.java
+++ b/sdk/android/api/org/webrtc/SoftwareVideoEncoderFactory.java
@@ -19,6 +19,9 @@ public class SoftwareVideoEncoderFactory implements VideoEncoderFactory {
  @Nullable
  @Override
  public VideoEncoder createEncoder(VideoCodecInfo info) {
+    if (info.name.equalsIgnoreCase("H264")) {
+      return new LibH264Encoder();
+    }
    if (info.name.equalsIgnoreCase("VP8")) {
      return new LibvpxVp8Encoder();
    }
@@ -38,6 +41,9 @@ public class SoftwareVideoEncoderFactory implements VideoEncoderFactory {
    List<VideoCodecInfo> codecs = new ArrayList<VideoCodecInfo>();

    codecs.add(new VideoCodecInfo("VP8", new HashMap<>()));
+
+    codecs.add(new VideoCodecInfo("H264", new HashMap<>()));
+
    if (LibvpxVp9Encoder.nativeIsSupported()) {
      codecs.add(new VideoCodecInfo("VP9", new HashMap<>()));
    }

9. 编译使用吧,祝好运。。。

本文参考自 webrtc M75支持android安卓H264软编解遇到的一些坑
在其基础补充、完善部分说明和详细修改结果,如有问题欢迎反馈


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