From a3844d9c44bc2acde431c34811e702d5fdbabe5b Mon Sep 17 00:00:00 2001
From: Brion Vibber <brion@pobox.com>
Date: Wed, 8 Mar 2023 11:21:37 -0800
Subject: [PATCH] WIP m3u8 gen

---
 make-fmp4.sh      | 26 +++++++++++---------
 meta-playlist.php | 61 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+), 11 deletions(-)
 create mode 100644 meta-playlist.php

diff --git a/make-fmp4.sh b/make-fmp4.sh
index 07cfcb7..ebeaf67 100755
--- a/make-fmp4.sh
+++ b/make-fmp4.sh
@@ -1,5 +1,6 @@
 interval=10
-MOVFLAGS="-movflags +frag_keyframe+empty_moov -force_key_frames expr:gte(t,n_forced*$interval)"
+#MOVFLAGS="-movflags +frag_keyframe+empty_moov -force_key_frames expr:gte(t,n_forced*$interval)"
+MOVFLAGS="-movflags +frag_keyframe+empty_moov"
 AUDFLAGS="-movflags +empty_moov -frag_duration ${interval}000000"
 BITRATE_HI="-b:v 1250k"
 BITRATE_LO="-b:v 1000k"
@@ -18,20 +19,23 @@ INFILE=caminandes-llamigos.webm
 set -e
 
 # Audio for HLS
-ffmpeg -i $INFILE -vn $AUDIO_MP3 -y fmp4.audio.mp3
+ffmpeg -i $INFILE -vn $AUDIO_MP3 -y fmp4.audio.mpeg.mp3
 ffmpeg -i $INFILE -vn $AUDIO_AAC $AUDFLAGS  -y fmp4.audio.aac.mp4
 ffmpeg -i $INFILE -vn $AUDIO_OPUS $AUDFLAGS -y fmp4.audio.opus.mp4
 
 # Video for HLS
-ffmpeg -i $INFILE -an $VIDEO_H264 $MOVFLAGS -pass 1 -y fmp4.video.h264.mp4
-ffmpeg -i $INFILE -an $VIDEO_H264 $MOVFLAGS -pass 2 -y fmp4.video.h264.mp4
+ffmpeg -i $INFILE -an $VIDEO_H264 $MOVFLAGS -pass 1 -y fmp4.480p.h264.mp4
+ffmpeg -i $INFILE -an $VIDEO_H264 $MOVFLAGS -pass 2 -y fmp4.480p.h264.mp4
 
-ffmpeg -i $INFILE -an $VIDEO_VP9 $MOVFLAGS -pass 1 -y fmp4.video.vp9.mp4
-ffmpeg -i $INFILE -an $VIDEO_VP9 $MOVFLAGS -pass 2 -y fmp4.video.vp9.mp4
+ffmpeg -i $INFILE -an $VIDEO_VP9 $MOVFLAGS -pass 1 -y fmp4.480p.vp9.mp4
+ffmpeg -i $INFILE -an $VIDEO_VP9 $MOVFLAGS -pass 2 -y fmp4.480p.vp9.mp4
 
 # Playlist processing
-#php extract-playlist.php fmp4.audio.mp3 fmp4.audio.mp3.m3u8
-#php extract-playlist.php fmp4.audio.aac.mp4 fmp4.audio.aac.mp4.m3u8
-#php extract-playlist.php fmp4.audio.opus.mp4 fmp4.audio.opus.mp4.m3u8
-#php extract-playlist.php fmp4.video.h264.mp4 fmp4.video.h264.mp4.m3u8
-#php extract-playlist.php fmp4.video.vp9.mp4 fmp4.video.vp9.mp4.m3u8
+php extract-playlist.php fmp4.audio.mpeg.mp3 > fmp4.audio.mpeg.mp3.m3u8
+php extract-playlist.php fmp4.audio.aac.mp4 > fmp4.audio.aac.mp4.m3u8
+php extract-playlist.php fmp4.audio.opus.mp4 > fmp4.audio.opus.mp4.m3u8
+php extract-playlist.php fmp4.480p.h264.mp4 > fmp4.480p.h264.mp4.m3u8
+php extract-playlist.php fmp4.480p.vp9.mp4 > fmp4.480p.vp9.mp4.m3u8
+
+php meta-playlist.php fmp4 audio.opus.mp4 audio.mpeg.mp3 480p.vp9.mp4 > fmp4.vp9.m3u8
+php meta-playlist.php fmp4 audio.opus.mp4 audio.mpeg.mp3 480p.vp9.mp4 480p.h264.mp4 > fmp4.vp9-h264.m3u8
diff --git a/meta-playlist.php b/meta-playlist.php
new file mode 100644
index 0000000..e1f7f04
--- /dev/null
+++ b/meta-playlist.php
@@ -0,0 +1,61 @@
+<?php
+
+$argv = $_SERVER['argv'];
+$self = array_shift( $argv );
+$base = array_shift( $argv ); // "fmp4"
+$audio = [];
+$video = [];
+
+$audioCodecs = [
+    'mpeg' => 'mp4a.40.34',
+    'opus' => 'opus'
+];
+
+// @fixme use correct settings based on the file
+$videoCodecs = [
+    'vp9' => 'vp09.00.10.08',
+    'h264' => 'avc1.42e00a',
+];
+
+
+while ( count( $argv ) > 0 ) {
+    $track = array_shift( $argv );
+    [ $res, $codec, $ext ] = explode( '.', $track, 3 );
+    $filename = "$base.$res.$codec.$ext";
+    $playlist = "$filename.m3u8";
+
+    if ( $res === 'audio' ) {
+        $name = 'English'; // @fixme use correct unknown marker
+        $language = 'en-US'; // @fixme
+        $channels = 2; // @fixme
+        $uri = urlencode( $filename );
+        $audio[$codec] = "#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID=\"$codec\",NAME=\"$name\",LANGUAGE=\"$language\",AUTOSELECT=YES,DEFAULT=YES,CHANNELS=\"$channels\",URI=\"$uri\"";
+    } else {
+        $bandwidth = 1250000; // @fixme
+        $width = 854; // @fixme
+        $height = 480; // @fixme
+        $fps = 24.0; // @fixme
+        $baseLine = "#EXT-X-STREAM-INFO:BANDWIDTH=$bandwidth,RESOLUTION={$width}x{$height},FRAME-RATE={$fps}";
+        if ( count( $audio ) > 1 ) {
+            foreach ( array_keys( $audio ) as $audioCodec ) {
+                $codecs = implode( ',', [
+                    $videoCodecs[$codec],
+                    $audioCodecs[$audioCodec],
+                ] );
+                $line = "$baseLine,CODECS=\"$codecs\"";
+            }
+        } else {
+            $codecs = $videoCodecs[$codec];
+            $line = "$baseLine,CODECS=\"$codecs\",AUDIO=\"$audioCodec\"";
+        }
+    }
+}
+
+$lines = array_concat(
+    [ '#EXTM3U' ],
+    array_values( $audio ),
+    $video
+);
+
+$m3u8 = implode( "\n", $lines );
+print $m3u8;