Add ffmpeg n3.4.4 dependency

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

WORKSPACE

@@ -61,3 +61,14 @@ http_archive(
     strip_prefix = "aws-sdk-cpp-1.3.15",
     build_file = "//third_party:aws.BUILD",
 )
+
+http_archive(
+    name = "ffmpeg",
+    urls = [
+        "https://mirror.bazel.build/github.com/FFmpeg/FFmpeg/archive/n3.4.4.tar.gz",
+        "https://github.com/FFmpeg/FFmpeg/archive/n3.4.4.tar.gz",
+    ],
+    sha256 = "bbccc87cd031498728bcc2dba5596a47e6fd92b2cec060a71feef65617a261fe",
+    strip_prefix = "FFmpeg-n3.4.4",
+    build_file = "//third_party:ffmpeg.BUILD",
+)

third_party/ffmpeg.BUILD

@@ -0,0 +1,67 @@
+# Description:
+#   FFmpeg
+
+licenses(["notice"])  # LGPL v2.1+ license
+
+exports_files(["LICENSE.md"])
+
+cc_library(
+    name = "ffmpeg",
+    srcs = [
+    ],
+    hdrs = [
+        "libavformat/avformat.h",
+        "libavformat/avio.h",
+        "libavformat/version.h",
+        "libavcodec/version.h",
+        "libavcodec/avcodec.h",
+        "libavutil/avconfig.h",
+        "libavutil/samplefmt.h",
+        "libavutil/avutil.h",
+        "libavutil/common.h",
+        "libavutil/attributes.h",
+        "libavutil/macros.h",
+        "libavutil/version.h",
+        "libavutil/mem.h",
+        "libavutil/error.h",
+        "libavutil/rational.h",
+        "libavutil/mathematics.h",
+        "libavutil/intfloat.h",
+        "libavutil/log.h",
+        "libavutil/pixfmt.h",
+        "libavutil/buffer.h",
+        "libavutil/cpu.h",
+        "libavutil/channel_layout.h",
+        "libavutil/dict.h",
+        "libavutil/frame.h",
+        "libavutil/imgutils.h",
+        "libavutil/pixdesc.h",
+        "libswscale/swscale.h",
+        "libswscale/version.h",
+    ],
+    copts = [],
+    defines = [],
+    includes = [],
+    linkopts = [
+        "-l:libavformat.so.57",
+        "-l:libavcodec.so.57",
+        "-l:libavutil.so.55",
+        "-l:libswscale.so.4",
+    ],
+    visibility = ["//visibility:public"],
+    deps = [],
+)
+
+genrule(
+    name = "libavutil_avconfig_h",
+    outs = ["libavutil/avconfig.h"],
+    cmd = "\n".join([
+        "cat <<'EOF' >$@",
+        "#ifndef AVUTIL_AVCONFIG_H",
+        "#define AVUTIL_AVCONFIG_H",
+        "#define AV_HAVE_BIGENDIAN 0",
+        "#define AV_HAVE_FAST_UNALIGNED 1",
+        "#endif /* AVUTIL_AVCONFIG_H */",
+        "EOF",
+    ]),
+)