use ffmpeg to generate peaks

Aptfile

@@ -2,23 +2,4 @@ libmad0-dev
 libid3tag0-dev
 libsndfile1-dev
 libgd-dev
-lame
-
-# libboost-dev=1.65.1
-# libboost-regex-dev=1.65.1
-# libboost-filesystem-dev=1.65.1
-# libboost-program-options-dev=1.65.1
-
-libboost-dev
-libboost-filesystem-dev
-libboost-program-options-dev
-libboost-regex-dev
-# # http://mirrors.kernel.org/ubuntu/pool/main/b/boost-defaults/libboost-dev_1.65.1.0ubuntu1_amd64.deb
-
-# http://mirrors.kernel.org/ubuntu/pool/universe/b/boost-defaults/libboost-regex-dev_1.65.1.0ubuntu1_amd64.deb
-
-# http://mirrors.kernel.org/ubuntu/pool/main/b/boost-defaults/libboost-filesystem-dev_1.65.1.0ubuntu1_amd64.deb
-
-# http://mirrors.kernel.org/ubuntu/pool/main/b/boost1.65.1/libboost-program-options1.65-dev_1.65.1+dfsg-0ubuntu5_amd64.deb
-
-https://launchpad.net/~chris-needham/+archive/ubuntu/ppa/+files/audiowaveform_1.6.0-1bionic1_amd64.deb
+lame

Dockerfile

@@ -2,10 +2,18 @@ FROM elixir:1.13.4
 
 RUN apt update
 RUN apt install -y nodejs npm
+RUN npm install --global yarn
 RUN apt install -y inotify-tools
 
 RUN mix local.hex --force
+RUN apt-get install -y ffmpeg
+
+RUN apt-get install software-properties-common -y
+RUN add-apt-repository ppa:chris-needham/ppa
+RUN apt-get update
+RUN apt-get install audiowaveform
+
+
 
-RUN npm install --global yarn
 
 WORKDIR /app

assets/js/controllers/audio_controller.js

@@ -32,7 +32,7 @@ export default class extends Controller {
         pixelRatio: 10,
         cursorWidth: 1,
         cursorColor: "lightgray",
-        normalize: true,
+        normalize: false,
         responsive: true,
         fillParent: true
       })

docker-compose.yml

@@ -0,0 +1,61 @@
+version: '2.4'
+
+x-app:
+  &app
+  build:
+    context: .
+    dockerfile: ./Dockerfile
+    args:
+      PG_MAJOR: '14'
+      NODE_MAJOR: '16'
+      YARN_VERSION: '1.13.0'
+  environment:
+    &env
+    MIX_ENV: development
+  # image: chaskiq/chaskiq:1.1.0
+  tmpfs:
+    - /tmp
+
+x-backend:
+  &backend
+  <<: *app
+  stdin_open: true
+  tty: true
+  volumes:
+    - .:/app:cached
+  environment:
+    <<: *env
+    DATABASE_URL: postgres://postgres:password@postgres:5432
+    EDITOR: vi
+  depends_on:
+    postgres:
+      condition: service_healthy
+
+services:
+  runner:
+    <<: *backend
+    command: /bin/bash
+
+  phoenix:
+    <<: *backend
+    command: mix phx.server
+    ports:
+      - '4000:4000'
+
+  postgres:
+    image: postgres:14-alpine
+    volumes:
+      - ~/apps/postgres:/var/lib/postgresql/data
+    environment:
+      #POSTGRES_USER: postgresql
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: password
+      PSQL_HISTFILE: /root/log/.psql_history
+    ports:
+      - 5432
+    healthcheck:
+      test: pg_isready -U postgres -h 127.0.0.1
+      interval: 5s
+
+volumes:
+  postgres: null

lib/rauversion/services/peaks_generator.ex

@@ -28,11 +28,13 @@ defmodule Rauversion.Services.PeaksGenerator do
     # audiowaveform -i /root/audio.mp3 --pixels-per-second 100 --output-format json -
   end
 
-  def run_ffprobe(file) do
+  def run_ffprobe(file, duration) do
     IO.inspect("processing #{file}")
 
+    pixels_per_frame = duration * 75
+
     cmd =
-      "#{ffprobe_path()} -v error -f lavfi -i amovie=#{file},astats=metadata=1:reset=1 -show_entries frame_tags=lavfi.astats.Overall.Peak_level -of json"
+      "#{ffprobe_path()} -v error -f lavfi -i amovie=#{file},asetnsamples=n=#{pixels_per_frame}:p=0,astats=metadata=1:reset=1 -show_entries frame_tags=lavfi.astats.Overall.Peak_level -of json"
       |> to_charlist()
 
     IO.inspect(cmd)
@@ -46,6 +48,7 @@ defmodule Rauversion.Services.PeaksGenerator do
           _ -> nil
         end
       end)
+      |> normalize
   end
 
   def desired_pixels_per_second(desired_pixels, duration) do
@@ -75,7 +78,7 @@ defmodule Rauversion.Services.PeaksGenerator do
       input,
       &((new_min + (&1 - min) / (max - min) * (new_max - new_min))
         |> Decimal.from_float()
-        |> Decimal.round(4)
+        |> Decimal.round(1)
         |> Decimal.to_float())
     )
   end

lib/rauversion/tracks/track.ex

@@ -90,7 +90,7 @@ defmodule Rauversion.Tracks.Track do
           if kind == "audio" do
             # coput temp file from live
             {:ok, dir_path} = Temp.mkdir("my-dir")
-            new_path = "#{dir_path}#{file.filename}"
+            new_path = "#{dir_path}#{file.filename}" |> String.replace(~r/\s+/, "-")
             :ok = File.cp(file.path, new_path)
 
             file = %{file | path: new_path}
@@ -99,7 +99,7 @@ defmodule Rauversion.Tracks.Track do
 
             duration = blob |> ActiveStorage.Blob.metadata() |> Map.get("duration")
 
-            case Rauversion.Services.PeaksGenerator.run_audiowaveform(path, duration) do
+            case Rauversion.Services.PeaksGenerator.run_ffprobe(path, duration) do
               [_ | _] = data ->
                 put_change(struct, :metadata, %{peaks: data})
 

test/rauversion/peak_genenerator_test.exs

@@ -5,12 +5,26 @@ defmodule Rauversion.PeaksGeneratorTest do
 
   describe "peaks generator" do
     test "peaks gen" do
-      assert [hd | rest] = Rauversion.Services.PeaksGenerator.run("./test/files/audio.mp3")
+      assert [hd | rest] =
+               Rauversion.Services.PeaksGenerator.run_audiowaveform("./test/files/audio.mp3", 3)
+
+      IO.inspect(rest)
       IO.inspect("qty: #{rest |> length}")
     end
 
     test "peaks gen ffprobe" do
-      a = Rauversion.Services.PeaksGenerator.run_ffprobe("./test/files/audio.mp3")
+      a = Rauversion.Services.PeaksGenerator.run_ffprobe("./test/files/audio.mp3", 3)
+      require IEx
+      IEx.pry()
+    end
+
+    test "desired pixels" do
+      desired_pixels = 500
+      duration = 3600
+
+      pixels_per_second =
+        Rauversion.Services.PeaksGenerator.desired_pixels_per_second(desired_pixels, duration)
+
       require IEx
       IEx.pry()
     end