FFMpeg Homebrew Formula with Opus FLV Support

ffmpeg.rb

class Ffmpeg < Formula
  desc "Play, record, convert, and stream audio and video"
  homepage "https://ffmpeg.org/"
  url "https://ffmpeg.org/releases/ffmpeg-6.0.tar.xz"
  sha256 "57be87c22d9b49c112b6d24bc67d42508660e6b718b3db89c44e47e289137082"
  # None of these parts are used by default, you have to explicitly pass `--enable-gpl`
  # to configure to activate them. In this case, FFmpeg's license changes to GPL v2+.
  license "GPL-2.0-or-later"
  head "https://github.com/FFmpeg/FFmpeg.git", branch: "master"

  livecheck do
    url "https://ffmpeg.org/download.html"
    regex(/href=.*?ffmpeg[._-]v?(\d+(?:\.\d+)+)\.t/i)
  end

  depends_on "pkg-config" => :build
  depends_on "aom"
  depends_on "aribb24"
  depends_on "dav1d"
  depends_on "fontconfig"
  depends_on "freetype"
  depends_on "frei0r"
  depends_on "gnutls"
  depends_on "lame"
  depends_on "libass"
  depends_on "libbluray"
  depends_on "librist"
  depends_on "libsoxr"
  depends_on "libvidstab"
  depends_on "libvmaf"
  depends_on "libvorbis"
  depends_on "libvpx"
  depends_on "opencore-amr"
  depends_on "openjpeg"
  depends_on "opus"
  depends_on "rav1e"
  depends_on "rubberband"
  depends_on "sdl2"
  depends_on "snappy"
  depends_on "speex"
  depends_on "srt"
  depends_on "svt-av1"
  depends_on "tesseract"
  depends_on "theora"
  depends_on "webp"
  depends_on "x264"
  depends_on "x265"
  depends_on "xvid"
  depends_on "xz"
  depends_on "zeromq"
  depends_on "zimg"

  uses_from_macos "bzip2"
  uses_from_macos "libxml2"
  uses_from_macos "zlib"

  on_linux do
    depends_on "alsa-lib"
    depends_on "libxv"
  end

  on_intel do
    depends_on "nasm" => :build
  end

  fails_with gcc: "5"

  patch :DATA

  def install
    args = %W[
      --prefix=#{prefix}
      --enable-shared
      --enable-pthreads
      --enable-version3
      --cc=#{ENV.cc}
      --host-cflags=#{ENV.cflags}
      --host-ldflags=#{ENV.ldflags}
      --enable-ffplay
      --enable-gnutls
      --enable-gpl
      --enable-libaom
      --enable-libaribb24
      --enable-libbluray
      --enable-libdav1d
      --enable-libmp3lame
      --enable-libopus
      --enable-librav1e
      --enable-librist
      --enable-librubberband
      --enable-libsnappy
      --enable-libsrt
      --enable-libsvtav1
      --enable-libtesseract
      --enable-libtheora
      --enable-libvidstab
      --enable-libvmaf
      --enable-libvorbis
      --enable-libvpx
      --enable-libwebp
      --enable-libx264
      --enable-libx265
      --enable-libxml2
      --enable-libxvid
      --enable-lzma
      --enable-libfontconfig
      --enable-libfreetype
      --enable-frei0r
      --enable-libass
      --enable-libopencore-amrnb
      --enable-libopencore-amrwb
      --enable-libopenjpeg
      --enable-libspeex
      --enable-libsoxr
      --enable-libzmq
      --enable-libzimg
      --disable-libjack
      --disable-indev=jack
    ]

    # Needs corefoundation, coremedia, corevideo
    args += %w[--enable-videotoolbox --enable-audiotoolbox] if OS.mac?
    args << "--enable-neon" if Hardware::CPU.arm?

    system "./configure", *args
    system "make", "install"

    # Build and install additional FFmpeg tools
    system "make", "alltools"
    bin.install Dir["tools/*"].select { |f| File.executable? f }

    # Fix for Non-executables that were installed to bin/
    mv bin/"python", pkgshare/"python", force: true
  end

  test do
    # Create an example mp4 file
    mp4out = testpath/"video.mp4"
    system bin/"ffmpeg", "-filter_complex", "testsrc=rate=1:duration=1", mp4out
    assert_predicate mp4out, :exist?
  end
end

__END__
diff --git a/libavformat/flv.h b/libavformat/flv.h
index 3571b90279..e061a209d6 100644
--- a/libavformat/flv.h
+++ b/libavformat/flv.h
@@ -99,6 +99,7 @@ enum {
     FLV_CODECID_PCM_MULAW            = 8 << FLV_AUDIO_CODECID_OFFSET,
     FLV_CODECID_AAC                  = 10<< FLV_AUDIO_CODECID_OFFSET,
     FLV_CODECID_SPEEX                = 11<< FLV_AUDIO_CODECID_OFFSET,
+    FLV_CODECID_OPUS                 = 13<< FLV_AUDIO_CODECID_OFFSET,
 };

 enum {
diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index d83edff727..6a6f30f77d 100644
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -237,6 +237,11 @@ static int flv_same_audio_codec(AVCodecParameters *apar, int flags)
     case FLV_CODECID_PCM_ALAW:
         return apar->sample_rate == 8000 &&
                apar->codec_id    == AV_CODEC_ID_PCM_ALAW;
+    case FLV_CODECID_OPUS:
+        return apar->sample_rate == 48000 &&
+               apar->channels    == 2 &&
+               apar->bits_per_coded_sample == 16 &&
+               apar->codec_id    == AV_CODEC_ID_OPUS;
     default:
         return apar->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
     }
@@ -295,6 +300,12 @@ static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream,
         apar->sample_rate = 8000;
         apar->codec_id    = AV_CODEC_ID_PCM_ALAW;
         break;
+    case FLV_CODECID_OPUS:
+        apar->sample_rate = 48000;
+        apar->channels    = 2;
+        apar->bits_per_coded_sample = 16;
+        apar->codec_id    = AV_CODEC_ID_OPUS;
+        break;
     default:
         avpriv_request_sample(s, "Audio codec (%x)",
                flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
index 721f062811..f95472e6cb 100644
--- a/libavformat/flvenc.c
+++ b/libavformat/flvenc.c
@@ -60,6 +60,7 @@ static const AVCodecTag flv_audio_codec_ids[] = {
     { AV_CODEC_ID_PCM_MULAW,  FLV_CODECID_PCM_MULAW  >> FLV_AUDIO_CODECID_OFFSET },
     { AV_CODEC_ID_PCM_ALAW,   FLV_CODECID_PCM_ALAW   >> FLV_AUDIO_CODECID_OFFSET },
     { AV_CODEC_ID_SPEEX,      FLV_CODECID_SPEEX      >> FLV_AUDIO_CODECID_OFFSET },
+    { AV_CODEC_ID_OPUS,       FLV_CODECID_OPUS      >> FLV_AUDIO_CODECID_OFFSET },
     { AV_CODEC_ID_NONE,       0 }
 };

@@ -128,7 +129,10 @@ static int get_audio_flags(AVFormatContext *s, AVCodecParameters *par)
     if (par->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
         return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |
                FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
-    else if (par->codec_id == AV_CODEC_ID_SPEEX) {
+    else if (par->codec_id == AV_CODEC_ID_OPUS) {
+        return FLV_CODECID_OPUS | FLV_SAMPLERATE_44100HZ |
+            FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
+    } else if (par->codec_id == AV_CODEC_ID_SPEEX) {
         if (par->sample_rate != 16000) {
             av_log(s, AV_LOG_ERROR,
                    "FLV only supports wideband (16kHz) Speex audio\n");