From 44a1795550c2ebb21ab7ba80ea34d36f112ef926 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20=C5=9Aled=C5=BA?= <michalsledz34@gmail.com>
Date: Wed, 29 Nov 2023 20:07:09 +0100
Subject: [PATCH 1/4] Add IVF reader

---
 lib/ex_webrtc/media/ivf_reader.ex            | 139 +++++++++++++++++++
 test/ex_webrtc/media/ivf_reader_test.exs     |  62 +++++++++
 test/fixtures/ivf/README.md                  |   5 +
 test/fixtures/ivf/empty.ivf                  |   0
 test/fixtures/ivf/vp8_correct.ivf            | Bin 0 -> 15850 bytes
 test/fixtures/ivf/vp8_invalid_last_frame.ivf | Bin 0 -> 15849 bytes
 6 files changed, 206 insertions(+)
 create mode 100644 lib/ex_webrtc/media/ivf_reader.ex
 create mode 100644 test/ex_webrtc/media/ivf_reader_test.exs
 create mode 100644 test/fixtures/ivf/README.md
 create mode 100644 test/fixtures/ivf/empty.ivf
 create mode 100644 test/fixtures/ivf/vp8_correct.ivf
 create mode 100644 test/fixtures/ivf/vp8_invalid_last_frame.ivf

diff --git a/lib/ex_webrtc/media/ivf_reader.ex b/lib/ex_webrtc/media/ivf_reader.ex
new file mode 100644
index 00000000..c7579e8a
--- /dev/null
+++ b/lib/ex_webrtc/media/ivf_reader.ex
@@ -0,0 +1,139 @@
+defmodule ExWebRTC.Media.IVFHeader do
+  @moduledoc """
+  Defines IVF Frame Header type.
+  """
+
+  @typedoc """
+  IVF Frame Header.
+
+  Description of these fields is taken from:
+  https://chromium.googlesource.com/chromium/src/media/+/master/filters/ivf_parser.h
+
+  * `signature` - always "DKIF"
+  * `version` - should be 0
+  * `header_size` - size of header in bytes
+  * `fourcc` - codec FourCC (e.g, 'VP80'). 
+  For more information, see https://fourcc.org/codecs.php 
+  * `width` - width in pixels
+  * `height` - height in pixels
+  * `timebase_denum` - timebase denumerator
+  * `timebase_num` - timebase numerator. For example, if
+  `timebase_denum` is 30 and `timebase_num` is 2, the unit
+  of `ExWebRTC.Media.IVFFrame`'s timestamp is 2/30 seconds.
+  * `num_frames` - number of frames in a file
+  * `unused` - unused
+  """
+  @type t() :: %__MODULE__{
+          signature: binary(),
+          version: integer(),
+          header_size: integer(),
+          fourcc: integer(),
+          width: integer(),
+          height: integer(),
+          timebase_denum: integer(),
+          timebase_num: integer(),
+          num_frames: integer(),
+          unused: integer()
+        }
+
+  @enforcekeyes [
+    :signature,
+    :version,
+    :header_size,
+    :fourcc,
+    :width,
+    :height,
+    :timebase_denum,
+    :timebase_num,
+    :num_frames,
+    :unused
+  ]
+  defstruct @enforcekeyes
+end
+
+defmodule ExWebRTC.Media.IVFFrame do
+  @moduledoc """
+  Defines IVF Frame type.
+  """
+
+  @typedoc """
+  IVF Frame.
+
+  `timestamp` is in `timebase_num`/`timebase_denum` seconds.
+  For more information see `ExWebRTC.Media.IVFHeader`.
+  """
+  @type t() :: %__MODULE__{
+          timestamp: integer(),
+          data: binary()
+        }
+
+  @enforcekeys [:timestamp, :data]
+  defstruct @enforcekeys
+end
+
+defmodule ExWebRTC.Media.IVFReader do
+  @moduledoc """
+  Defines IVF reader.
+
+  Based on:
+  * https://formats.kaitai.io/vp8_ivf/
+  * https://chromium.googlesource.com/chromium/src/media/+/refs/heads/main/filters/ivf_parser.cc
+  """
+
+  alias ExWebRTC.Media.{IVFHeader, IVFFrame}
+
+  @opaque t() :: File.io_device()
+
+  @spec open(Path.t()) :: {:ok, t()} | {:error, File.posix()}
+  def open(path), do: File.open(path)
+
+  @spec read_header(t()) :: {:ok, IVFHeader.t()} | {:error, :invalid_file} | :eof
+  def read_header(reader) do
+    case IO.binread(reader, 32) do
+      <<"DKIF", 0::little-integer-size(16), 32::little-integer-size(16),
+        fourcc::little-integer-size(32), width::little-integer-size(16),
+        height::little-integer-size(16), timebase_denum::little-integer-size(32),
+        timebase_num::little-integer-size(32), num_frames::little-integer-size(32),
+        unused::little-integer-size(32)>> ->
+        {:ok,
+         %IVFHeader{
+           signature: "DKIF",
+           version: 0,
+           header_size: 32,
+           fourcc: fourcc,
+           width: width,
+           height: height,
+           timebase_denum: timebase_denum,
+           timebase_num: timebase_num,
+           num_frames: num_frames,
+           unused: unused
+         }}
+
+      _other ->
+        {:error, :invalid_file}
+    end
+  end
+
+  @spec next_frame(t()) :: {:ok, IVFFrame.t()} | {:error, :invalid_file} | :eof
+  def next_frame(reader) do
+    case IO.binread(reader, 12) do
+      <<len_frame::little-integer-size(32), timestamp::little-integer-size(64)>> ->
+        case IO.binread(reader, len_frame) do
+          data when is_binary(data) and byte_size(data) == len_frame ->
+            {:ok, %IVFFrame{timestamp: timestamp, data: data}}
+
+          :eof ->
+            :eof
+
+          _other ->
+            {:error, :invalid_file}
+        end
+
+      :eof ->
+        :eof
+
+      _other ->
+        {:error, :invalid_file}
+    end
+  end
+end
diff --git a/test/ex_webrtc/media/ivf_reader_test.exs b/test/ex_webrtc/media/ivf_reader_test.exs
new file mode 100644
index 00000000..5b00e6e2
--- /dev/null
+++ b/test/ex_webrtc/media/ivf_reader_test.exs
@@ -0,0 +1,62 @@
+defmodule ExWebRTC.Media.IVFReaderTest do
+  use ExUnit.Case, async: true
+
+  alias ExWebRTC.Media.{IVFFrame, IVFHeader, IVFReader}
+
+  test "correct file" do
+    assert {:ok, reader} = IVFReader.open("test/fixtures/ivf/vp8_correct.ivf")
+
+    assert {:ok,
+            %IVFHeader{
+              signature: "DKIF",
+              version: 0,
+              header_size: 32,
+              fourcc: 808_996_950,
+              width: 176,
+              height: 144,
+              timebase_denum: 30_000,
+              timebase_num: 1000,
+              num_frames: 29,
+              unused: 0
+            }} == IVFReader.read_header(reader)
+
+    for i <- 0..28 do
+      assert {:ok, %IVFFrame{} = frame} = IVFReader.next_frame(reader)
+      assert frame.timestamp == i
+      assert is_binary(frame.data)
+      assert frame.data != <<>>
+    end
+  end
+
+  test "empty file" do
+    assert {:ok, reader} = IVFReader.open("test/fixtures/ivf/empty.ivf")
+    assert {:error, :invalid_file} == IVFReader.read_header(reader)
+  end
+
+  test "invalid last frame" do
+    assert {:ok, reader} = IVFReader.open("test/fixtures/ivf/vp8_invalid_last_frame.ivf")
+
+    assert {:ok,
+            %IVFHeader{
+              signature: "DKIF",
+              version: 0,
+              header_size: 32,
+              fourcc: 808_996_950,
+              width: 176,
+              height: 144,
+              timebase_denum: 30_000,
+              timebase_num: 1000,
+              num_frames: 29,
+              unused: 0
+            }} == IVFReader.read_header(reader)
+
+    for i <- 0..27 do
+      assert {:ok, %IVFFrame{} = frame} = IVFReader.next_frame(reader)
+      assert frame.timestamp == i
+      assert is_binary(frame.data)
+      assert frame.data != <<>>
+    end
+
+    assert {:error, :invalid_file} == IVFReader.next_frame(reader)
+  end
+end
diff --git a/test/fixtures/ivf/README.md b/test/fixtures/ivf/README.md
new file mode 100644
index 00000000..50e162b3
--- /dev/null
+++ b/test/fixtures/ivf/README.md
@@ -0,0 +1,5 @@
+# IVF Fixtures
+
+* empty - just an empty file
+* vp8_correct - https://chromium.googlesource.com/webm/vp8-test-vectors/+/refs/heads/main/vp80-00-comprehensive-001.ivf
+* vp8_invalid_last_frame - vp8_correct without last byte
diff --git a/test/fixtures/ivf/empty.ivf b/test/fixtures/ivf/empty.ivf
new file mode 100644
index 00000000..e69de29b
diff --git a/test/fixtures/ivf/vp8_correct.ivf b/test/fixtures/ivf/vp8_correct.ivf
new file mode 100644
index 0000000000000000000000000000000000000000..d7a7cd5d046e17fb50e72b743cc791092e79679c
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I!TA#We?tD7sQ>@~

literal 0
HcmV?d00001


From 5e72ee8ebdd048c044f1cfd11577fcc98d2b6b8a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20=C5=9Aled=C5=BA?= <michalsledz34@gmail.com>
Date: Thu, 30 Nov 2023 18:09:20 +0100
Subject: [PATCH 2/4] Fix IVFReader typespecs

---
 lib/ex_webrtc/media/ivf_reader.ex | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/lib/ex_webrtc/media/ivf_reader.ex b/lib/ex_webrtc/media/ivf_reader.ex
index c7579e8a..1437aae7 100644
--- a/lib/ex_webrtc/media/ivf_reader.ex
+++ b/lib/ex_webrtc/media/ivf_reader.ex
@@ -25,15 +25,15 @@ defmodule ExWebRTC.Media.IVFHeader do
   """
   @type t() :: %__MODULE__{
           signature: binary(),
-          version: integer(),
-          header_size: integer(),
-          fourcc: integer(),
-          width: integer(),
-          height: integer(),
-          timebase_denum: integer(),
-          timebase_num: integer(),
-          num_frames: integer(),
-          unused: integer()
+          version: non_neg_integer(),
+          header_size: non_neg_integer(),
+          fourcc: non_neg_integer(),
+          width: non_neg_integer(),
+          height: non_neg_integer(),
+          timebase_denum: non_neg_integer(),
+          timebase_num: non_neg_integer(),
+          num_frames: non_neg_integer(),
+          unused: non_neg_integer()
         }
 
   @enforcekeyes [

From c35753b3e059adbdc528cdd8a77d1a7b131f6c68 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20=C5=9Aled=C5=BA?= <michalsledz34@gmail.com>
Date: Thu, 30 Nov 2023 18:13:27 +0100
Subject: [PATCH 3/4] Refactor `next_frame`. Test eof.

---
 lib/ex_webrtc/media/ivf_reader.ex        | 30 ++++++++----------------
 test/ex_webrtc/media/ivf_reader_test.exs |  2 ++
 2 files changed, 12 insertions(+), 20 deletions(-)

diff --git a/lib/ex_webrtc/media/ivf_reader.ex b/lib/ex_webrtc/media/ivf_reader.ex
index 1437aae7..24acdc4c 100644
--- a/lib/ex_webrtc/media/ivf_reader.ex
+++ b/lib/ex_webrtc/media/ivf_reader.ex
@@ -36,7 +36,7 @@ defmodule ExWebRTC.Media.IVFHeader do
           unused: non_neg_integer()
         }
 
-  @enforcekeyes [
+  @enforce_keys [
     :signature,
     :version,
     :header_size,
@@ -48,7 +48,7 @@ defmodule ExWebRTC.Media.IVFHeader do
     :num_frames,
     :unused
   ]
-  defstruct @enforcekeyes
+  defstruct @enforce_keys
 end
 
 defmodule ExWebRTC.Media.IVFFrame do
@@ -116,24 +116,14 @@ defmodule ExWebRTC.Media.IVFReader do
 
   @spec next_frame(t()) :: {:ok, IVFFrame.t()} | {:error, :invalid_file} | :eof
   def next_frame(reader) do
-    case IO.binread(reader, 12) do
-      <<len_frame::little-integer-size(32), timestamp::little-integer-size(64)>> ->
-        case IO.binread(reader, len_frame) do
-          data when is_binary(data) and byte_size(data) == len_frame ->
-            {:ok, %IVFFrame{timestamp: timestamp, data: data}}
-
-          :eof ->
-            :eof
-
-          _other ->
-            {:error, :invalid_file}
-        end
-
-      :eof ->
-        :eof
-
-      _other ->
-        {:error, :invalid_file}
+    with <<len_frame::little-integer-size(32), timestamp::little-integer-size(64)>> <-
+           IO.binread(reader, 12),
+         data when is_binary(data) and byte_size(data) == len_frame <-
+           IO.binread(reader, len_frame) do
+      {:ok, %IVFFrame{timestamp: timestamp, data: data}}
+    else
+      :eof -> :eof
+      _other -> {:error, :invalid_file}
     end
   end
 end
diff --git a/test/ex_webrtc/media/ivf_reader_test.exs b/test/ex_webrtc/media/ivf_reader_test.exs
index 5b00e6e2..3e288d37 100644
--- a/test/ex_webrtc/media/ivf_reader_test.exs
+++ b/test/ex_webrtc/media/ivf_reader_test.exs
@@ -26,6 +26,8 @@ defmodule ExWebRTC.Media.IVFReaderTest do
       assert is_binary(frame.data)
       assert frame.data != <<>>
     end
+
+    assert :eof == IVFReader.next_frame(reader)
   end
 
   test "empty file" do

From ce96dd902150341caa159faa41bbb93f81d8284e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20=C5=9Aled=C5=BA?= <michalsledz34@gmail.com>
Date: Thu, 30 Nov 2023 18:20:45 +0100
Subject: [PATCH 4/4] Fix remaining enforcekeys

---
 lib/ex_webrtc/media/ivf_reader.ex | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/ex_webrtc/media/ivf_reader.ex b/lib/ex_webrtc/media/ivf_reader.ex
index 24acdc4c..aedcad9c 100644
--- a/lib/ex_webrtc/media/ivf_reader.ex
+++ b/lib/ex_webrtc/media/ivf_reader.ex
@@ -67,8 +67,8 @@ defmodule ExWebRTC.Media.IVFFrame do
           data: binary()
         }
 
-  @enforcekeys [:timestamp, :data]
-  defstruct @enforcekeys
+  @enforce_keys [:timestamp, :data]
+  defstruct @enforce_keys
 end
 
 defmodule ExWebRTC.Media.IVFReader do