media/filters/decrypting_media_resource.cc

   1 // Copyright 2018 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/filters/decrypting_media_resource.h"
   6
   7 #include <memory>
   8 #include <utility>
   9
  10 #include "base/functional/bind.h"
  11 #include "base/functional/callback_helpers.h"
  12 #include "base/logging.h"
  13 #include "base/task/sequenced_task_runner.h"
  14 #include "media/base/cdm_context.h"
  15 #include "media/base/demuxer_stream.h"
  16 #include "media/base/media_log.h"
  17 #include "media/base/pipeline_status.h"
  18 #include "media/filters/decrypting_demuxer_stream.h"
  19
  20 namespace media {
  21
  22 DecryptingMediaResource::DecryptingMediaResource(
  23     MediaResource* media_resource,
  24     CdmContext* cdm_context,
  25     MediaLog* media_log,
  26     scoped_refptr<base::SequencedTaskRunner> task_runner)
  27     : media_resource_(media_resource),
  28       cdm_context_(cdm_context),
  29       media_log_(media_log),
  30       task_runner_(task_runner) {
  31   DCHECK(media_resource);
  32   DCHECK_EQ(MediaResource::Type::kStream, media_resource->GetType());
  33   DCHECK(cdm_context_);
  34   DCHECK(cdm_context_->GetDecryptor());
  35   DCHECK(cdm_context_->GetDecryptor()->CanAlwaysDecrypt());
  36   DCHECK(media_log_);
  37   DCHECK(task_runner->RunsTasksInCurrentSequence());
  38 }
  39
  40 DecryptingMediaResource::~DecryptingMediaResource() = default;
  41
  42 MediaResource::Type DecryptingMediaResource::GetType() const {
  43   DCHECK_EQ(MediaResource::Type::kStream, media_resource_->GetType());
  44   return MediaResource::Type::kStream;
  45 }
  46
  47 std::vector<DemuxerStream*> DecryptingMediaResource::GetAllStreams() {
  48   if (streams_.size())
  49     return streams_;
  50
  51   return media_resource_->GetAllStreams();
  52 }
  53
  54 void DecryptingMediaResource::Initialize(InitCB init_cb, WaitingCB waiting_cb) {
  55   DCHECK(init_cb);
  56
  57   auto streams = media_resource_->GetAllStreams();
  58
  59   // Save the callback so that we can invoke it when the
  60   // DecryptingDemuxerStreams have finished initialization.
  61   init_cb_ = std::move(init_cb);
  62   num_dds_pending_init_ = streams.size();
  63
  64   for (auto* stream : streams) {
  65     auto decrypting_demuxer_stream = std::make_unique<DecryptingDemuxerStream>(
  66         task_runner_, media_log_, waiting_cb);
  67
  68     // DecryptingDemuxerStream always invokes the callback asynchronously so
  69     // that we have no reentrancy issues. "All public APIs and callbacks are
  70     // trampolined to the |task_runner_|."
  71     decrypting_demuxer_stream->Initialize(
  72         stream, cdm_context_,
  73         base::BindOnce(&DecryptingMediaResource::OnDecryptingDemuxerInitialized,
  74                        weak_factory_.GetWeakPtr()));
  75
  76     streams_.push_back(decrypting_demuxer_stream.get());
  77     owned_streams_.push_back(std::move(decrypting_demuxer_stream));
  78   }
  79 }
  80
  81 int DecryptingMediaResource::DecryptingDemuxerStreamCountForTesting() const {
  82   return owned_streams_.size();
  83 }
  84
  85 void DecryptingMediaResource::OnDecryptingDemuxerInitialized(
  86     PipelineStatus status) {
  87   DVLOG(2) << __func__ << ": DecryptingDemuxerStream initialization ended "
  88            << "with the status: " << status;
  89
  90   // Decrement the count of DecryptingDemuxerStreams that need to be
  91   // initialized.
  92   --num_dds_pending_init_;
  93
  94   if (!init_cb_)
  95     return;
  96
  97   if (status != PIPELINE_OK)
  98     std::move(init_cb_).Run(false);
  99   else if (num_dds_pending_init_ == 0)
 100     std::move(init_cb_).Run(true);
 101 }
 102
 103 }  // namespace media