Support CAST+WMPI on android

media/blink/webmediaplayer_cast_android.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "media/blink/webmediaplayer_cast_android.h"
+
+#include "gpu/GLES2/gl2extchromium.h"
+#include "gpu/blink/webgraphicscontext3d_impl.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
+#include "gpu/command_buffer/common/sync_token.h"
+#include "media/base/android/media_common_android.h"
+#include "media/base/bind_to_current_loop.h"
+#include "media/blink/webmediaplayer_impl.h"
+#include "media/blink/webmediaplayer_params.h"
+#include "third_party/WebKit/public/platform/WebMediaPlayerClient.h"
+#include "third_party/WebKit/public/web/WebDocument.h"
+#include "third_party/WebKit/public/web/WebLocalFrame.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkTypeface.h"
+#include "third_party/skia/include/gpu/GrContext.h"
+#include "third_party/skia/include/gpu/SkGrPixelRef.h"
+
+#if defined(OS_ANDROID)

[DaleCurtis, 2016/01/14 02:01:41]

Unnecessary?

[hubbe, 2016/01/14 18:05:00]

I thought so too, but apparently other platforms will try to compile this
without these ifdefs.

[DaleCurtis, 2016/01/14 18:25:40]

Probably you need to add the wmpcast_android to a sources! section in .gyp and
sources -= in GN then for non-android builds (or only add it in android builds,
depending on what the existing pattern is in the build files).

[DaleCurtis, 2016/01/15 19:55:44]

Can you resolve this? Add a if (is_android) section to the .gn and .gyp files.

[hubbe, 2016/01/15 20:35:47]

Done.

+
+using gpu::gles2::GLES2Interface;
+
+namespace media {
+
+namespace {
+// File-static function is to allow it to run even after WMPI is deleted.
+void OnReleaseTexture(const WebMediaPlayerCast::GLContextCB& context_3d_cb,
+                      GLuint texture_id,
+                      const gpu::SyncToken& sync_token) {
+  GLES2Interface* gl = context_3d_cb.Run();
+  if (!gl)
+    return;
+
+  gl->WaitSyncTokenCHROMIUM(sync_token.GetConstData());
+  gl->DeleteTextures(1, &texture_id);
+  // Flush to ensure that the texture gets deleted in a timely fashion.
+  gl->ShallowFlushCHROMIUM();
+}
+
+GLES2Interface* GLCBShim(
+    const WebMediaPlayerParams::Context3DCB& context_3d_cb) {
+  return context_3d_cb.Run().gl;
+}
+
+}  // namespace
+
+scoped_refptr<VideoFrame> WebMediaPlayerCast::MakeTextFrameForCast(
+    const std::string& remote_playback_message,
+    gfx::Size canvas_size,
+    const WebMediaPlayerCast::GLContextCB& context_3d_cb) {
+  SkBitmap bitmap;
+  bitmap.allocN32Pixels(canvas_size.width(), canvas_size.height());
+
+  // Create the canvas and draw the "Casting to <Chromecast>" text on it.
+  SkCanvas canvas(bitmap);
+  canvas.drawColor(SK_ColorBLACK);
+
+  const SkScalar kTextSize(40);
+  const SkScalar kMinPadding(40);
+
+  SkPaint paint;
+  paint.setAntiAlias(true);
+  paint.setFilterQuality(kHigh_SkFilterQuality);
+  paint.setColor(SK_ColorWHITE);
+  paint.setTypeface(SkTypeface::CreateFromName("sans", SkTypeface::kBold));
+  paint.setTextSize(kTextSize);
+
+  // Calculate the vertical margin from the top
+  SkPaint::FontMetrics font_metrics;
+  paint.getFontMetrics(&font_metrics);
+  SkScalar sk_vertical_margin = kMinPadding - font_metrics.fAscent;
+
+  // Measure the width of the entire text to display
+  size_t display_text_width = paint.measureText(remote_playback_message.c_str(),
+                                                remote_playback_message.size());
+  std::string display_text(remote_playback_message);
+
+  if (display_text_width + (kMinPadding * 2) > canvas_size.width()) {
+    // The text is too long to fit in one line, truncate it and append ellipsis
+    // to the end.
+
+    // First, figure out how much of the canvas the '...' will take up.
+    const std::string kTruncationEllipsis("\xE2\x80\xA6");
+    SkScalar sk_ellipse_width = paint.measureText(kTruncationEllipsis.c_str(),
+                                                  kTruncationEllipsis.size());
+
+    // Then calculate how much of the text can be drawn with the '...' appended
+    // to the end of the string.
+    SkScalar sk_max_original_text_width(canvas_size.width() -
+                                        (kMinPadding * 2) - sk_ellipse_width);
+    size_t sk_max_original_text_length = paint.breakText(
+        remote_playback_message.c_str(), remote_playback_message.size(),
+        sk_max_original_text_width);
+
+    // Remove the part of the string that doesn't fit and append '...'.
+    display_text.erase(
+        sk_max_original_text_length,
+        remote_playback_message.size() - sk_max_original_text_length);
+    display_text.append(kTruncationEllipsis);
+    display_text_width =
+        paint.measureText(display_text.c_str(), display_text.size());
+  }
+
+  // Center the text horizontally.
+  SkScalar sk_horizontal_margin =
+      (canvas_size.width() - display_text_width) / 2.0;
+  canvas.drawText(display_text.c_str(), display_text.size(),
+                  sk_horizontal_margin, sk_vertical_margin, paint);
+
+  GLES2Interface* gl = context_3d_cb.Run();
+
+  // GPU Process crashed.
+  if (!gl)
+    return nullptr;
+  GLuint remote_playback_texture_id = 0;
+  gl->GenTextures(1, &remote_playback_texture_id);
+  GLuint texture_target = GL_TEXTURE_2D;
+  gl->BindTexture(texture_target, remote_playback_texture_id);
+  gl->TexParameteri(texture_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  gl->TexParameteri(texture_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  gl->TexParameteri(texture_target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  gl->TexParameteri(texture_target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+  {
+    SkAutoLockPixels lock(bitmap);
+    gl->TexImage2D(texture_target, 0 /* level */, GL_RGBA /* internalformat */,
+                   bitmap.width(), bitmap.height(), 0 /* border */,
+                   GL_RGBA /* format */, GL_UNSIGNED_BYTE /* type */,
+                   bitmap.getPixels());
+  }
+
+  gpu::Mailbox texture_mailbox;
+  gl->GenMailboxCHROMIUM(texture_mailbox.name);
+  gl->ProduceTextureCHROMIUM(texture_target, texture_mailbox.name);
+  gl->Flush();
+  gpu::SyncToken texture_mailbox_sync_token(gl->InsertSyncPointCHROMIUM());
+
+  return VideoFrame::WrapNativeTexture(
+      media::PIXEL_FORMAT_ARGB,
+      gpu::MailboxHolder(texture_mailbox, texture_mailbox_sync_token,
+                         texture_target),
+      media::BindToCurrentLoop(base::Bind(&OnReleaseTexture, context_3d_cb,
+                                          remote_playback_texture_id)),
+      canvas_size /* coded_size */, gfx::Rect(canvas_size) /* visible_rect */,
+      canvas_size /* natural_size */, base::TimeDelta() /* timestamp */);
+}
+
+WebMediaPlayerCast::WebMediaPlayerCast(
+    WebMediaPlayerImpl* impl,
+    blink::WebMediaPlayerClient* client,
+    const WebMediaPlayerParams::Context3DCB& context_3d_cb)
+    : webmediaplayer_(impl), client_(client), context_3d_cb_(context_3d_cb) {}
+
+WebMediaPlayerCast::~WebMediaPlayerCast() {
+  if (player_manager_) {
+    if (is_player_initialized_)
+      player_manager_->DestroyPlayer(player_id_);
+
+    player_manager_->UnregisterMediaPlayer(player_id_);
+  }
+}
+
+void WebMediaPlayerCast::Initialize(const GURL& url,
+                                    blink::WebLocalFrame* frame) {
+  player_manager_->Initialize(MEDIA_PLAYER_TYPE_URL, player_id_, url,
+                              frame->document().firstPartyForCookies(), 0,
+                              frame->document().url(), true);
+  is_player_initialized_ = true;
+}
+
+void WebMediaPlayerCast::set_media_player_manager(

[DaleCurtis, 2016/01/14 02:01:41]

SetMediaPlayerManager() no hacker_style() for non-inline methods.

[hubbe, 2016/01/14 18:05:00]

Done.

+    RendererMediaPlayerManagerInterface* media_player_manager) {
+  player_manager_ = media_player_manager;
+  player_id_ = player_manager_->RegisterMediaPlayer(this);
+}
+
+void WebMediaPlayerCast::requestRemotePlayback() {
+  player_manager_->Seek(player_id_, base::TimeDelta::FromSecondsD(
+                                        webmediaplayer_->currentTime()));
+  player_manager_->RequestRemotePlayback(player_id_);
+}
+
+void WebMediaPlayerCast::requestRemotePlaybackControl() {
+  player_manager_->RequestRemotePlaybackControl(player_id_);
+}
+
+// RendererMediaPlayerInterface implementation

[DaleCurtis, 2016/01/14 02:01:41]

Remove.

[hubbe, 2016/01/14 18:05:00]

Done.

+void WebMediaPlayerCast::OnMediaMetadataChanged(base::TimeDelta duration,
+                                                int width,
+                                                int height,
+                                                bool success) {}
+
+void WebMediaPlayerCast::OnPlaybackComplete() {
+  DVLOG(1) << __FUNCTION__;
+  webmediaplayer_->OnRemotePlaybackEnded();
+}
+
+void WebMediaPlayerCast::OnBufferingUpdate(int percentage) {
+  DVLOG(1) << __FUNCTION__;
+}
+
+void WebMediaPlayerCast::OnSeekRequest(const base::TimeDelta& time_to_seek) {
+  DVLOG(1) << __FUNCTION__;
+  // DCHECK(main_thread_checker_.CalledOnValidThread());

[DaleCurtis, 2016/01/14 02:01:41]

?

[hubbe, 2016/01/14 18:05:00]

Removed

+  client_->requestSeek(time_to_seek.InSecondsF());
+}
+
+void WebMediaPlayerCast::OnSeekComplete(const base::TimeDelta& current_time) {
+  DVLOG(1) << __FUNCTION__;
+  remote_time_at_ = base::TimeTicks::Now();
+  remote_time_ = current_time;
+  webmediaplayer_->OnPipelineSeeked(true, PIPELINE_OK);
+}
+
+void WebMediaPlayerCast::OnMediaError(int error_type) {
+  DVLOG(1) << __FUNCTION__;
+}
+
+void WebMediaPlayerCast::OnVideoSizeChanged(int width, int height) {
+  DVLOG(1) << __FUNCTION__;
+}
+
+void WebMediaPlayerCast::OnTimeUpdate(base::TimeDelta current_timestamp,
+                                      base::TimeTicks current_time_ticks) {
+  DVLOG(1) << __FUNCTION__ << " " << current_timestamp.InSecondsF();
+  remote_time_at_ = current_time_ticks;
+  remote_time_ = current_timestamp;
+}
+
+void WebMediaPlayerCast::OnPlayerReleased() {
+  DVLOG(1) << __FUNCTION__;
+}
+
+void WebMediaPlayerCast::OnConnectedToRemoteDevice(
+    const std::string& remote_playback_message) {
+  DVLOG(1) << __FUNCTION__;
+  remote_time_ = base::TimeDelta::FromSecondsD(webmediaplayer_->currentTime());
+  // Set paused so that progress bar doesn't advance while remote playback
+  // is starting.
+  webmediaplayer_->pause();

[DaleCurtis, 2016/01/14 02:01:41]

Do we want the UI to reflect this pause?

[hubbe, 2016/01/14 18:05:00]

I think so, it seems to make sense that the local player signals a "pause" while
the remote is loading. Once the playback starts it changes to play again. 
However, I think it could make sense either way.

[DaleCurtis, 2016/01/14 18:25:40]

You'll need to call playbackStateChanged() if so then -- otherwise the UI will
still show as playing.

[hubbe, 2016/01/15 20:35:47]

Actually, it seems the tests prefer it to be in "playing" state...

+  is_remote_ = true;
+  remote_playback_message_ = remote_playback_message;
+  webmediaplayer_->SuspendForRemote();
+  client_->connectedToRemoteDevice();
+}
+
+double WebMediaPlayerCast::currentTime() const {
+  base::TimeDelta ret = remote_time_;
+  if (!paused_) {
+    ret += base::TimeTicks::Now() - remote_time_at_;
+  }
+  return ret.InSecondsF();
+}
+
+void WebMediaPlayerCast::play() {
+  if (!paused_)
+    return;
+
+  player_manager_->Start(player_id_);
+  remote_time_at_ = base::TimeTicks::Now();
+  paused_ = false;
+}
+void WebMediaPlayerCast::pause() {

[DaleCurtis, 2016/01/14 02:01:41]

insert line above.

[hubbe, 2016/01/14 18:05:00]

Done.

+  player_manager_->Pause(player_id_, true);
+}
+
+void WebMediaPlayerCast::seek(base::TimeDelta t) {
+  should_notify_time_changed_ = true;
+  player_manager_->Seek(player_id_, t);
+}
+
+void WebMediaPlayerCast::OnDisconnectedFromRemoteDevice() {
+  DVLOG(1) << __FUNCTION__;
+  is_remote_ = false;
+  double t = currentTime();
+  if (t + media::kTimeUpdateInterval * 2 / 1000 > webmediaplayer_->duration()) {
+    t = webmediaplayer_->duration();
+  }
+  webmediaplayer_->OnDisconnectedFromRemoteDevice(t);
+}
+
+void WebMediaPlayerCast::OnDidExitFullscreen() {
+  DVLOG(1) << __FUNCTION__;
+}
+
+void WebMediaPlayerCast::OnMediaPlayerPlay() {
+  DVLOG(1) << __FUNCTION__ << " is_remote_ = " << is_remote_;
+  if (is_remote_ && paused_) {
+    paused_ = false;
+    remote_time_at_ = base::TimeTicks::Now();
+    client_->playbackStateChanged();
+  }
+  // Blink expects a timeChanged() in response to a seek().
+  if (should_notify_time_changed_)
+    client_->timeChanged();
+}
+
+void WebMediaPlayerCast::OnMediaPlayerPause() {
+  DVLOG(1) << __FUNCTION__ << " is_remote_ = " << is_remote_;
+  if (is_remote_ && !paused_) {
+    paused_ = true;
+    client_->playbackStateChanged();
+  }
+}
+
+void WebMediaPlayerCast::OnRemoteRouteAvailabilityChanged(
+    bool routes_available) {
+  DVLOG(1) << __FUNCTION__;
+  client_->remoteRouteAvailabilityChanged(routes_available);
+}
+
+void WebMediaPlayerCast::SuspendAndReleaseResources() {}
+void WebMediaPlayerCast::OnWaitingForDecryptionKey() {}
+
+bool WebMediaPlayerCast::hasVideo() const {
+  return true;
+}
+
+bool WebMediaPlayerCast::paused() const {
+  return paused_;
+}
+
+#if defined(VIDEO_HOLE)
+bool WebMediaPlayerCast::UpdateBoundaryRectangle() {
+  return false;
+}
+const gfx::RectF WebMediaPlayerCast::GetBoundaryRectangle() {
+  return gfx::RectF();
+}
+#endif  // defined(VIDEO_HOLE)
+
+scoped_refptr<VideoFrame> WebMediaPlayerCast::GetCastingBanner() {
+  DVLOG(1) << __FUNCTION__;
+  // DCHECK(main_thread_checker_.CalledOnValidThread());

[DaleCurtis, 2016/01/14 02:01:41]

?

[hubbe, 2016/01/14 18:05:00]

Removed.

+
+  // TODO(johnme): Should redraw this frame if the layer bounds change; but
+  // there seems no easy way to listen for the layer resizing (as opposed to
+  // OnVideoSizeChanged, which is when the frame sizes of the video file
+  // change). Perhaps have to poll (on main thread of course)?
+  gfx::Size canvas_size = webmediaplayer_->GetCanvasSize();
+  if (!canvas_size.width())
+    return nullptr;
+
+  return MakeTextFrameForCast(remote_playback_message_, canvas_size,
+                              base::Bind(&GLCBShim, context_3d_cb_));
+}
+
+}  // namespace media
+
+#endif  // OS_ANDROID