1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76


media / base / media_resource.h [blame]

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_BASE_MEDIA_RESOURCE_H_
#define MEDIA_BASE_MEDIA_RESOURCE_H_

#include <vector>

#include "base/memory/raw_ptr.h"
#include "base/time/time.h"
#include "media/base/demuxer_stream.h"
#include "media/base/media_export.h"
#include "media/base/media_url_params.h"

namespace media {

// Abstract class that defines how to retrieve "media resources" in
// DemuxerStream form (for most cases) or URL form (for the MediaPlayerRenderer
// case).
//
// The derived classes must return a non-null value for the getter method
// associated with their type, and return a null/empty value for other getters.
class MEDIA_EXPORT MediaResource {
 public:
  enum class Type {
    kStream,  // Indicates GetAllStreams() or GetFirstStream() should be used
    KUrl,     // Indicates GetUrl() should be used
  };

  MediaResource();

  MediaResource(const MediaResource&) = delete;
  MediaResource& operator=(const MediaResource&) = delete;

  virtual ~MediaResource();

  virtual MediaResource::Type GetType() const;

  // For Type::STREAM:
  // Returns a collection of available DemuxerStream objects.
  //   NOTE: Once a DemuxerStream pointer is returned from GetStream it is
  //   guaranteed to stay valid for as long as the Demuxer/MediaResource
  //   is alive. But make no assumption that once GetStream returned a non-null
  //   pointer for some stream type then all subsequent calls will also return
  //   non-null pointer for the same stream type. In MSE Javascript code can
  //   remove SourceBuffer from a MediaSource at any point and this will make
  //   some previously existing streams inaccessible/unavailable.
  virtual std::vector<DemuxerStream*> GetAllStreams() = 0;

  // A helper function that return the first stream of the given `type` if one
  // exists or a null pointer if there is no streams of that type.
  DemuxerStream* GetFirstStream(DemuxerStream::Type type);

  // For Type::URL:
  //   Returns the URL parameters of the media to play. Empty URLs are legal,
  //   and should be handled appropriately by the caller.
  // Other types:
  //   Should not be called.
  virtual const MediaUrlParams& GetMediaUrlParams() const;

  // This method is only used with the MediaUrlDemuxer, to propagate duration
  // changes coming from the MediaPlayerRendereClient.
  //
  // This method could be refactored if WMPI was aware of the concrete type of
  // Demuxer* it is dealing with.
  virtual void ForwardDurationChangeToDemuxerHost(base::TimeDelta duration);

  // This method is only used with the MediaUrlDemuxer, to set headers coming
  // from media url params.
  virtual void SetHeaders(base::flat_map<std::string, std::string> headers);
};

}  // namespace media

#endif  // MEDIA_BASE_MEDIA_RESOURCE_H_