third_party/chromium/media/base/media_tracks.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/base/media_tracks.h"

#include <memory>

#include "base/bind.h"
#include "base/no_destructor.h"
#include "media/base/audio_decoder_config.h"
#include "media/base/video_decoder_config.h"

namespace media {

MediaTracks::MediaTracks() = default;

MediaTracks::~MediaTracks() = default;

MediaTrack* MediaTracks::AddAudioTrack(
    const AudioDecoderConfig& config,
    StreamParser::TrackId bytestream_track_id,
    const MediaTrack::Kind& kind,
    const MediaTrack::Label& label,
    const MediaTrack::Language& language) {
  DCHECK(config.IsValidConfig());
  CHECK(audio_configs_.find(bytestream_track_id) == audio_configs_.end());
  std::unique_ptr<MediaTrack> track = std::make_unique<MediaTrack>(
      MediaTrack::Audio, bytestream_track_id, kind, label, language);
  MediaTrack* track_ptr = track.get();
  tracks_.push_back(std::move(track));
  audio_configs_[bytestream_track_id] = config;
  return track_ptr;
}

MediaTrack* MediaTracks::AddVideoTrack(
    const VideoDecoderConfig& config,
    StreamParser::TrackId bytestream_track_id,
    const MediaTrack::Kind& kind,
    const MediaTrack::Label& label,
    const MediaTrack::Language& language) {
  DCHECK(config.IsValidConfig());
  CHECK(video_configs_.find(bytestream_track_id) == video_configs_.end());
  std::unique_ptr<MediaTrack> track = std::make_unique<MediaTrack>(
      MediaTrack::Video, bytestream_track_id, kind, label, language);
  MediaTrack* track_ptr = track.get();
  tracks_.push_back(std::move(track));
  video_configs_[bytestream_track_id] = config;
  return track_ptr;
}

const AudioDecoderConfig& MediaTracks::getAudioConfig(
    StreamParser::TrackId bytestream_track_id) const {
  auto it = audio_configs_.find(bytestream_track_id);
  if (it != audio_configs_.end())
    return it->second;
  static base::NoDestructor<AudioDecoderConfig> invalidConfig;
  return *invalidConfig;
}

const VideoDecoderConfig& MediaTracks::getVideoConfig(
    StreamParser::TrackId bytestream_track_id) const {
  auto it = video_configs_.find(bytestream_track_id);
  if (it != video_configs_.end())
    return it->second;
  static base::NoDestructor<VideoDecoderConfig> invalidConfig;
  return *invalidConfig;
}

}  // namespace media