Renamed VideoSourceInterface to VideoTrackSourceInterface.

webrtc/api/videocapturertracksource.cc

Index: webrtc/api/videocapturertracksource.cc
diff --git a/webrtc/api/videocapturertracksource.cc b/webrtc/api/videocapturertracksource.cc
index aeb2516b3656b5307091b5cb8a58075625d5029b..c505e86bd5207481b18b892cc6496efa21cfdf4d 100644
--- a/webrtc/api/videocapturertracksource.cc
+++ b/webrtc/api/videocapturertracksource.cc
@@ -1,5 +1,4 @@
 /*
- /*
  *  Copyright 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
@@ -11,5 +10,436 @@
 
 #include "webrtc/api/videocapturertracksource.h"
 
-// TODO(perkj): This file is added to prepare for changing name of VideoSource
-// to VideoCapturerTrackSource.
+#include <cstdlib>
+#include <string>
+#include <vector>
+
+#include "webrtc/api/mediaconstraintsinterface.h"
+#include "webrtc/base/arraysize.h"
+
+using cricket::CaptureState;
+using webrtc::MediaConstraintsInterface;
+using webrtc::MediaSourceInterface;
+
+namespace {
+
+const double kRoundingTruncation = 0.0005;
+
+// Default resolution. If no constraint is specified, this is the resolution we
+// will use.
+static const cricket::VideoFormatPod kDefaultFormat = {
+    640, 480, FPS_TO_INTERVAL(30), cricket::FOURCC_ANY};
+
+// List of formats used if the camera doesn't support capability enumeration.
+static const cricket::VideoFormatPod kVideoFormats[] = {
+    {1920, 1080, FPS_TO_INTERVAL(30), cricket::FOURCC_ANY},
+    {1280, 720, FPS_TO_INTERVAL(30), cricket::FOURCC_ANY},
+    {960, 720, FPS_TO_INTERVAL(30), cricket::FOURCC_ANY},
+    {640, 360, FPS_TO_INTERVAL(30), cricket::FOURCC_ANY},
+    {640, 480, FPS_TO_INTERVAL(30), cricket::FOURCC_ANY},
+    {320, 240, FPS_TO_INTERVAL(30), cricket::FOURCC_ANY},
+    {320, 180, FPS_TO_INTERVAL(30), cricket::FOURCC_ANY}};
+
+MediaSourceInterface::SourceState GetReadyState(cricket::CaptureState state) {
+  switch (state) {
+    case cricket::CS_STARTING:
+      return MediaSourceInterface::kInitializing;
+    case cricket::CS_RUNNING:
+      return MediaSourceInterface::kLive;
+    case cricket::CS_FAILED:
+    case cricket::CS_STOPPED:
+      return MediaSourceInterface::kEnded;
+    case cricket::CS_PAUSED:
+      return MediaSourceInterface::kMuted;
+    default:
+      ASSERT(false && "GetReadyState unknown state");
+  }
+  return MediaSourceInterface::kEnded;
+}
+
+void SetUpperLimit(int new_limit, int* original_limit) {
+  if (*original_limit < 0 || new_limit < *original_limit)
+    *original_limit = new_limit;
+}
+
+// Updates |format_upper_limit| from |constraint|.
+// If constraint.maxFoo is smaller than format_upper_limit.foo,
+// set format_upper_limit.foo to constraint.maxFoo.
+void SetUpperLimitFromConstraint(
+    const MediaConstraintsInterface::Constraint& constraint,
+    cricket::VideoFormat* format_upper_limit) {
+  if (constraint.key == MediaConstraintsInterface::kMaxWidth) {
+    int value = rtc::FromString<int>(constraint.value);
+    SetUpperLimit(value, &(format_upper_limit->width));
+  } else if (constraint.key == MediaConstraintsInterface::kMaxHeight) {
+    int value = rtc::FromString<int>(constraint.value);
+    SetUpperLimit(value, &(format_upper_limit->height));
+  }
+}
+
+// Fills |format_out| with the max width and height allowed by |constraints|.
+void FromConstraintsForScreencast(
+    const MediaConstraintsInterface::Constraints& constraints,
+    cricket::VideoFormat* format_out) {
+  typedef MediaConstraintsInterface::Constraints::const_iterator
+      ConstraintsIterator;
+
+  cricket::VideoFormat upper_limit(-1, -1, 0, 0);
+  for (ConstraintsIterator constraints_it = constraints.begin();
+       constraints_it != constraints.end(); ++constraints_it)
+    SetUpperLimitFromConstraint(*constraints_it, &upper_limit);
+
+  if (upper_limit.width >= 0)
+    format_out->width = upper_limit.width;
+  if (upper_limit.height >= 0)
+    format_out->height = upper_limit.height;
+}
+
+// Returns true if |constraint| is fulfilled. |format_out| can differ from
+// |format_in| if the format is changed by the constraint. Ie - the frame rate
+// can be changed by setting maxFrameRate.
+bool NewFormatWithConstraints(
+    const MediaConstraintsInterface::Constraint& constraint,
+    const cricket::VideoFormat& format_in,
+    bool mandatory,
+    cricket::VideoFormat* format_out) {
+  ASSERT(format_out != NULL);
+  *format_out = format_in;
+
+  if (constraint.key == MediaConstraintsInterface::kMinWidth) {
+    int value = rtc::FromString<int>(constraint.value);
+    return (value <= format_in.width);
+  } else if (constraint.key == MediaConstraintsInterface::kMaxWidth) {
+    int value = rtc::FromString<int>(constraint.value);
+    return (value >= format_in.width);
+  } else if (constraint.key == MediaConstraintsInterface::kMinHeight) {
+    int value = rtc::FromString<int>(constraint.value);
+    return (value <= format_in.height);
+  } else if (constraint.key == MediaConstraintsInterface::kMaxHeight) {
+    int value = rtc::FromString<int>(constraint.value);
+    return (value >= format_in.height);
+  } else if (constraint.key == MediaConstraintsInterface::kMinFrameRate) {
+    int value = rtc::FromString<int>(constraint.value);
+    return (value <= cricket::VideoFormat::IntervalToFps(format_in.interval));
+  } else if (constraint.key == MediaConstraintsInterface::kMaxFrameRate) {
+    int value = rtc::FromString<int>(constraint.value);
+    if (value == 0) {
+      if (mandatory) {
+        // TODO(ronghuawu): Convert the constraint value to float when sub-1fps
+        // is supported by the capturer.
+        return false;
+      } else {
+        value = 1;
+      }
+    }
+    if (value <= cricket::VideoFormat::IntervalToFps(format_in.interval))
+      format_out->interval = cricket::VideoFormat::FpsToInterval(value);
+    return true;
+  } else if (constraint.key == MediaConstraintsInterface::kMinAspectRatio) {
+    double value = rtc::FromString<double>(constraint.value);
+    // The aspect ratio in |constraint.value| has been converted to a string and
+    // back to a double, so it may have a rounding error.
+    // E.g if the value 1/3 is converted to a string, the string will not have
+    // infinite length.
+    // We add a margin of 0.0005 which is high enough to detect the same aspect
+    // ratio but small enough to avoid matching wrong aspect ratios.
+    double ratio = static_cast<double>(format_in.width) / format_in.height;
+    return (value <= ratio + kRoundingTruncation);
+  } else if (constraint.key == MediaConstraintsInterface::kMaxAspectRatio) {
+    double value = rtc::FromString<double>(constraint.value);
+    double ratio = static_cast<double>(format_in.width) / format_in.height;
+    // Subtract 0.0005 to avoid rounding problems. Same as above.
+    const double kRoundingTruncation = 0.0005;
+    return (value >= ratio - kRoundingTruncation);
+  } else if (constraint.key == MediaConstraintsInterface::kNoiseReduction) {
+    // These are actually options, not constraints, so they can be satisfied
+    // regardless of the format.
+    return true;
+  }
+  LOG(LS_WARNING) << "Found unknown MediaStream constraint. Name:"
+                  << constraint.key << " Value:" << constraint.value;
+  return false;
+}
+
+// Removes cricket::VideoFormats from |formats| that don't meet |constraint|.
+void FilterFormatsByConstraint(
+    const MediaConstraintsInterface::Constraint& constraint,
+    bool mandatory,
+    std::vector<cricket::VideoFormat>* formats) {
+  std::vector<cricket::VideoFormat>::iterator format_it = formats->begin();
+  while (format_it != formats->end()) {
+    // Modify the format_it to fulfill the constraint if possible.
+    // Delete it otherwise.
+    if (!NewFormatWithConstraints(constraint, (*format_it), mandatory,
+                                  &(*format_it))) {
+      format_it = formats->erase(format_it);
+    } else {
+      ++format_it;
+    }
+  }
+}
+
+// Returns a vector of cricket::VideoFormat that best match |constraints|.
+std::vector<cricket::VideoFormat> FilterFormats(
+    const MediaConstraintsInterface::Constraints& mandatory,
+    const MediaConstraintsInterface::Constraints& optional,
+    const std::vector<cricket::VideoFormat>& supported_formats) {
+  typedef MediaConstraintsInterface::Constraints::const_iterator
+      ConstraintsIterator;
+  std::vector<cricket::VideoFormat> candidates = supported_formats;
+
+  for (ConstraintsIterator constraints_it = mandatory.begin();
+       constraints_it != mandatory.end(); ++constraints_it)
+    FilterFormatsByConstraint(*constraints_it, true, &candidates);
+
+  if (candidates.size() == 0)
+    return candidates;
+
+  // Ok - all mandatory checked and we still have a candidate.
+  // Let's try filtering using the optional constraints.
+  for (ConstraintsIterator constraints_it = optional.begin();
+       constraints_it != optional.end(); ++constraints_it) {
+    std::vector<cricket::VideoFormat> current_candidates = candidates;
+    FilterFormatsByConstraint(*constraints_it, false, &current_candidates);
+    if (current_candidates.size() > 0) {
+      candidates = current_candidates;
+    }
+  }
+
+  // We have done as good as we can to filter the supported resolutions.
+  return candidates;
+}
+
+// Find the format that best matches the default video size.
+// Constraints are optional and since the performance of a video call
+// might be bad due to bitrate limitations, CPU, and camera performance,
+// it is better to select a resolution that is as close as possible to our
+// default and still meets the contraints.
+const cricket::VideoFormat& GetBestCaptureFormat(
+    const std::vector<cricket::VideoFormat>& formats) {
+  ASSERT(formats.size() > 0);
+
+  int default_area = kDefaultFormat.width * kDefaultFormat.height;
+
+  std::vector<cricket::VideoFormat>::const_iterator it = formats.begin();
+  std::vector<cricket::VideoFormat>::const_iterator best_it = formats.begin();
+  int best_diff_area = std::abs(default_area - it->width * it->height);
+  int64_t best_diff_interval = kDefaultFormat.interval;
+  for (; it != formats.end(); ++it) {
+    int diff_area = std::abs(default_area - it->width * it->height);
+    int64_t diff_interval = std::abs(kDefaultFormat.interval - it->interval);
+    if (diff_area < best_diff_area ||
+        (diff_area == best_diff_area && diff_interval < best_diff_interval)) {
+      best_diff_area = diff_area;
+      best_diff_interval = diff_interval;
+      best_it = it;
+    }
+  }
+  return *best_it;
+}
+
+// Set |option| to the highest-priority value of |key| in the constraints.
+// Return false if the key is mandatory, and the value is invalid.
+bool ExtractOption(const MediaConstraintsInterface* all_constraints,
+                   const std::string& key,
+                   rtc::Optional<bool>* option) {
+  size_t mandatory = 0;
+  bool value;
+  if (FindConstraint(all_constraints, key, &value, &mandatory)) {
+    *option = rtc::Optional<bool>(value);
+    return true;
+  }
+
+  return mandatory == 0;
+}
+
+// Search |all_constraints| for known video options.  Apply all options that are
+// found with valid values, and return false if any mandatory video option was
+// found with an invalid value.
+bool ExtractVideoOptions(const MediaConstraintsInterface* all_constraints,
+                         cricket::VideoOptions* options) {
+  bool all_valid = true;
+
+  all_valid &=
+      ExtractOption(all_constraints, MediaConstraintsInterface::kNoiseReduction,
+                    &(options->video_noise_reduction));
+
+  return all_valid;
+}
+
+}  // anonymous namespace
+
+namespace webrtc {
+
+rtc::scoped_refptr<VideoTrackSourceInterface> VideoCapturerTrackSource::Create(
+    rtc::Thread* worker_thread,
+    cricket::VideoCapturer* capturer,
+    const webrtc::MediaConstraintsInterface* constraints,
+    bool remote) {
+  RTC_DCHECK(worker_thread != NULL);
+  RTC_DCHECK(capturer != NULL);
+  rtc::scoped_refptr<VideoCapturerTrackSource> source(
+      new rtc::RefCountedObject<VideoCapturerTrackSource>(worker_thread,
+                                                          capturer, remote));
+  source->Initialize(constraints);
+  return source;
+}
+
+rtc::scoped_refptr<VideoTrackSourceInterface> VideoCapturerTrackSource::Create(
+    rtc::Thread* worker_thread,
+    cricket::VideoCapturer* capturer,
+    bool remote) {
+  RTC_DCHECK(worker_thread != NULL);
+  RTC_DCHECK(capturer != NULL);
+  rtc::scoped_refptr<VideoCapturerTrackSource> source(
+      new rtc::RefCountedObject<VideoCapturerTrackSource>(worker_thread,
+                                                          capturer, remote));
+  source->Initialize(nullptr);
+  return source;
+}
+
+VideoCapturerTrackSource::VideoCapturerTrackSource(
+    rtc::Thread* worker_thread,
+    cricket::VideoCapturer* capturer,
+    bool remote)
+    : signaling_thread_(rtc::Thread::Current()),
+      worker_thread_(worker_thread),
+      video_capturer_(capturer),
+      started_(false),
+      state_(kInitializing),
+      remote_(remote) {
+  video_capturer_->SignalStateChange.connect(
+      this, &VideoCapturerTrackSource::OnStateChange);
+}
+
+VideoCapturerTrackSource::~VideoCapturerTrackSource() {
+  video_capturer_->SignalStateChange.disconnect(this);
+  Stop();
+}
+
+void VideoCapturerTrackSource::Initialize(
+    const webrtc::MediaConstraintsInterface* constraints) {
+  std::vector<cricket::VideoFormat> formats =
+      *video_capturer_->GetSupportedFormats();
+  if (formats.empty()) {
+    if (video_capturer_->IsScreencast()) {
+      // The screen capturer can accept any resolution and we will derive the
+      // format from the constraints if any.
+      // Note that this only affects tab capturing, not desktop capturing,
+      // since the desktop capturer does not respect the VideoFormat passed in.
+      formats.push_back(cricket::VideoFormat(kDefaultFormat));
+    } else {
+      // The VideoCapturer implementation doesn't support capability
+      // enumeration. We need to guess what the camera supports.
+      for (int i = 0; i < arraysize(kVideoFormats); ++i) {
+        formats.push_back(cricket::VideoFormat(kVideoFormats[i]));
+      }
+    }
+  }
+
+  if (constraints) {
+    MediaConstraintsInterface::Constraints mandatory_constraints =
+        constraints->GetMandatory();
+    MediaConstraintsInterface::Constraints optional_constraints;
+    optional_constraints = constraints->GetOptional();
+
+    if (video_capturer_->IsScreencast()) {
+      // Use the maxWidth and maxHeight allowed by constraints for screencast.
+      FromConstraintsForScreencast(mandatory_constraints, &(formats[0]));
+    }
+
+    formats =
+        FilterFormats(mandatory_constraints, optional_constraints, formats);
+  }
+
+  if (formats.size() == 0) {
+    LOG(LS_WARNING) << "Failed to find a suitable video format.";
+    SetState(kEnded);
+    return;
+  }
+
+  cricket::VideoOptions options;
+  if (!ExtractVideoOptions(constraints, &options)) {
+    LOG(LS_WARNING) << "Could not satisfy mandatory options.";
+    SetState(kEnded);
+    return;
+  }
+  options_.SetAll(options);
+  options_.is_screencast = rtc::Optional<bool>(video_capturer_->IsScreencast());
+
+  format_ = GetBestCaptureFormat(formats);
+  // Start the camera with our best guess.
+  // TODO(perkj): Should we try again with another format it it turns out that
+  // the camera doesn't produce frames with the correct format? Or will
+  // cricket::VideCapturer be able to re-scale / crop to the requested
+  // resolution?
+  if (!worker_thread_->Invoke<bool>(
+          rtc::Bind(&cricket::VideoCapturer::StartCapturing,
+                    video_capturer_.get(), format_))) {
+    SetState(kEnded);
+    return;
+  }
+  started_ = true;
+  // Initialize hasn't succeeded until a successful state change has occurred.
+}
+
+void VideoCapturerTrackSource::Stop() {
+  if (!started_) {
+    return;
+  }
+  started_ = false;
+  worker_thread_->Invoke<void>(
+      rtc::Bind(&cricket::VideoCapturer::Stop, video_capturer_.get()));
+}
+
+void VideoCapturerTrackSource::Restart() {
+  if (started_) {
+    return;
+  }
+  if (!worker_thread_->Invoke<bool>(
+          rtc::Bind(&cricket::VideoCapturer::StartCapturing,
+                    video_capturer_.get(), format_))) {
+    SetState(kEnded);
+    return;
+  }
+  started_ = true;
+}
+
+void VideoCapturerTrackSource::AddOrUpdateSink(
+    rtc::VideoSinkInterface<cricket::VideoFrame>* sink,
+    const rtc::VideoSinkWants& wants) {
+  worker_thread_->Invoke<void>(
+      rtc::Bind(&cricket::VideoCapturer::AddOrUpdateSink, video_capturer_.get(),
+                sink, wants));
+}
+
+void VideoCapturerTrackSource::RemoveSink(
+    rtc::VideoSinkInterface<cricket::VideoFrame>* output) {
+  worker_thread_->Invoke<void>(rtc::Bind(&cricket::VideoCapturer::RemoveSink,
+                                         video_capturer_.get(), output));
+}
+
+// OnStateChange listens to the cricket::VideoCapturer::SignalStateChange.
+void VideoCapturerTrackSource::OnStateChange(
+    cricket::VideoCapturer* capturer,
+    cricket::CaptureState capture_state) {
+  if (rtc::Thread::Current() != signaling_thread_) {
+    invoker_.AsyncInvoke<void>(
+        signaling_thread_, rtc::Bind(&VideoCapturerTrackSource::OnStateChange,
+                                     this, capturer, capture_state));
+    return;
+  }
+
+  if (capturer == video_capturer_.get()) {
+    SetState(GetReadyState(capture_state));
+  }
+}
+
+void VideoCapturerTrackSource::SetState(SourceState new_state) {
+  if (state_ != new_state) {
+    state_ = new_state;
+    FireOnChanged();
+  }
+}
+
+}  // namespace webrtc