content/renderer/pepper/content_decryptor_delegate.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_RENDERER_PEPPER_CONTENT_DECRYPTOR_DELEGATE_H_
   6 #define CONTENT_RENDERER_PEPPER_CONTENT_DECRYPTOR_DELEGATE_H_
   7
   8 #include <map>
   9 #include <queue>
  10 #include <string>
  11
  12 #include "base/basictypes.h"
  13 #include "base/callback_helpers.h"
  14 #include "base/compiler_specific.h"
  15 #include "base/containers/scoped_ptr_hash_map.h"
  16 #include "base/memory/ref_counted.h"
  17 #include "base/memory/weak_ptr.h"
  18 #include "media/base/cdm_promise.h"
  19 #include "media/base/channel_layout.h"
  20 #include "media/base/decryptor.h"
  21 #include "media/base/media_keys.h"
  22 #include "media/base/sample_format.h"
  23 #include "ppapi/c/pp_time.h"
  24 #include "ppapi/c/private/pp_content_decryptor.h"
  25 #include "ppapi/c/private/ppp_content_decryptor_private.h"
  26 #include "ui/gfx/size.h"
  27
  28 namespace media {
  29 class AudioDecoderConfig;
  30 class DecoderBuffer;
  31 class VideoDecoderConfig;
  32 }
  33
  34 namespace content {
  35
  36 class PPB_Buffer_Impl;
  37
  38 class ContentDecryptorDelegate {
  39  public:
  40   // ContentDecryptorDelegate does not take ownership of
  41   // |plugin_decryption_interface|. Therefore |plugin_decryption_interface|
  42   // must outlive this object.
  43   ContentDecryptorDelegate(
  44       PP_Instance pp_instance,
  45       const PPP_ContentDecryptor_Private* plugin_decryption_interface);
  46   ~ContentDecryptorDelegate();
  47
  48   // This object should not be accessed after |fatal_plugin_error_cb| is called.
  49   void Initialize(
  50       const std::string& key_system,
  51       const media::SessionMessageCB& session_message_cb,
  52       const media::SessionReadyCB& session_ready_cb,
  53       const media::SessionClosedCB& session_closed_cb,
  54       const media::SessionErrorCB& session_error_cb,
  55       const media::SessionKeysChangeCB& session_keys_change_cb,
  56       const media::SessionExpirationUpdateCB& session_expiration_update_cb,
  57       const base::Closure& fatal_plugin_error_cb);
  58
  59   void InstanceCrashed();
  60
  61   // Provides access to PPP_ContentDecryptor_Private.
  62   void SetServerCertificate(const uint8_t* certificate,
  63                             uint32_t certificate_length,
  64                             scoped_ptr<media::SimpleCdmPromise> promise);
  65   void CreateSession(const std::string& init_data_type,
  66                      const uint8* init_data,
  67                      int init_data_length,
  68                      media::MediaKeys::SessionType session_type,
  69                      scoped_ptr<media::NewSessionCdmPromise> promise);
  70   void LoadSession(const std::string& web_session_id,
  71                    scoped_ptr<media::NewSessionCdmPromise> promise);
  72   void UpdateSession(const std::string& web_session_id,
  73                      const uint8* response,
  74                      int response_length,
  75                      scoped_ptr<media::SimpleCdmPromise> promise);
  76   void CloseSession(const std::string& web_session_id,
  77                     scoped_ptr<media::SimpleCdmPromise> promise);
  78   void RemoveSession(const std::string& web_session_id,
  79                      scoped_ptr<media::SimpleCdmPromise> promise);
  80   void GetUsableKeyIds(const std::string& web_session_id,
  81                        scoped_ptr<media::KeyIdsPromise> promise);
  82   bool Decrypt(media::Decryptor::StreamType stream_type,
  83                const scoped_refptr<media::DecoderBuffer>& encrypted_buffer,
  84                const media::Decryptor::DecryptCB& decrypt_cb);
  85   bool CancelDecrypt(media::Decryptor::StreamType stream_type);
  86   bool InitializeAudioDecoder(
  87       const media::AudioDecoderConfig& decoder_config,
  88       const media::Decryptor::DecoderInitCB& decoder_init_cb);
  89   bool InitializeVideoDecoder(
  90       const media::VideoDecoderConfig& decoder_config,
  91       const media::Decryptor::DecoderInitCB& decoder_init_cb);
  92   // TODO(tomfinegan): Add callback args for DeinitializeDecoder() and
  93   // ResetDecoder()
  94   bool DeinitializeDecoder(media::Decryptor::StreamType stream_type);
  95   bool ResetDecoder(media::Decryptor::StreamType stream_type);
  96   // Note: These methods can be used with unencrypted data.
  97   bool DecryptAndDecodeAudio(
  98       const scoped_refptr<media::DecoderBuffer>& encrypted_buffer,
  99       const media::Decryptor::AudioDecodeCB& audio_decode_cb);
 100   bool DecryptAndDecodeVideo(
 101       const scoped_refptr<media::DecoderBuffer>& encrypted_buffer,
 102       const media::Decryptor::VideoDecodeCB& video_decode_cb);
 103
 104   // PPB_ContentDecryptor_Private dispatching methods.
 105   void OnPromiseResolved(uint32 promise_id);
 106   void OnPromiseResolvedWithSession(uint32 promise_id, PP_Var web_session_id);
 107   void OnPromiseResolvedWithKeyIds(uint32 promise_id, PP_Var key_ids_array);
 108   void OnPromiseRejected(uint32 promise_id,
 109                          PP_CdmExceptionCode exception_code,
 110                          uint32 system_code,
 111                          PP_Var error_description);
 112   void OnSessionMessage(PP_Var web_session_id,
 113                         PP_Var message,
 114                         PP_Var destination_url);
 115   void OnSessionKeysChange(PP_Var web_session_id,
 116                            PP_Bool has_additional_usable_key);
 117   void OnSessionExpirationChange(PP_Var web_session_id,
 118                                  PP_Time new_expiry_time);
 119   void OnSessionReady(PP_Var web_session_id);
 120   void OnSessionClosed(PP_Var web_session_id);
 121   void OnSessionError(PP_Var web_session_id,
 122                       PP_CdmExceptionCode exception_code,
 123                       uint32 system_code,
 124                       PP_Var error_description);
 125   void DeliverBlock(PP_Resource decrypted_block,
 126                     const PP_DecryptedBlockInfo* block_info);
 127   void DecoderInitializeDone(PP_DecryptorStreamType decoder_type,
 128                              uint32_t request_id,
 129                              PP_Bool success);
 130   void DecoderDeinitializeDone(PP_DecryptorStreamType decoder_type,
 131                                uint32_t request_id);
 132   void DecoderResetDone(PP_DecryptorStreamType decoder_type,
 133                         uint32_t request_id);
 134   void DeliverFrame(PP_Resource decrypted_frame,
 135                     const PP_DecryptedFrameInfo* frame_info);
 136   void DeliverSamples(PP_Resource audio_frames,
 137                       const PP_DecryptedSampleInfo* sample_info);
 138
 139  private:
 140   // The following types keep track of Promises. The index is the promise_id,
 141   // so that returning results can be matched to the corresponding promise.
 142   typedef base::ScopedPtrHashMap<uint32_t, media::CdmPromise> PromiseMap;
 143
 144   template <typename Callback>
 145   class TrackableCallback {
 146    public:
 147     TrackableCallback() : id_(0u) {}
 148     ~TrackableCallback() {
 149       // Callbacks must be satisfied.
 150       DCHECK_EQ(id_, 0u);
 151       DCHECK(is_null());
 152     };
 153
 154     bool Matches(uint32_t id) const { return id == id_; }
 155
 156     bool is_null() const { return cb_.is_null(); }
 157
 158     void Set(uint32_t id, const Callback& cb) {
 159       DCHECK_EQ(id_, 0u);
 160       DCHECK(cb_.is_null());
 161       id_ = id;
 162       cb_ = cb;
 163     }
 164
 165     Callback ResetAndReturn() {
 166       id_ = 0;
 167       return base::ResetAndReturn(&cb_);
 168     }
 169
 170    private:
 171     uint32_t id_;
 172     Callback cb_;
 173   };
 174
 175   // Cancels the pending decrypt-and-decode callback for |stream_type|.
 176   void CancelDecode(media::Decryptor::StreamType stream_type);
 177
 178   // Fills |resource| with a PPB_Buffer_Impl and copies the data from
 179   // |encrypted_buffer| into the buffer resource. This method reuses
 180   // |audio_input_resource_| and |video_input_resource_| to reduce the latency
 181   // in requesting new PPB_Buffer_Impl resources. The caller must make sure that
 182   // |audio_input_resource_| or |video_input_resource_| is available before
 183   // calling this method.
 184   //
 185   // An end of stream |encrypted_buffer| is represented as a null |resource|.
 186   //
 187   // Returns true upon success and false if any error happened.
 188   bool MakeMediaBufferResource(
 189       media::Decryptor::StreamType stream_type,
 190       const scoped_refptr<media::DecoderBuffer>& encrypted_buffer,
 191       scoped_refptr<PPB_Buffer_Impl>* resource);
 192
 193   void FreeBuffer(uint32_t buffer_id);
 194
 195   void SetBufferToFreeInTrackingInfo(PP_DecryptTrackingInfo* tracking_info);
 196
 197   // Deserializes audio data stored in |audio_frames| into individual audio
 198   // buffers in |frames|. Returns true upon success.
 199   bool DeserializeAudioFrames(PP_Resource audio_frames,
 200                               size_t data_size,
 201                               media::SampleFormat sample_format,
 202                               media::Decryptor::AudioBuffers* frames);
 203
 204   void SatisfyAllPendingCallbacksOnError();
 205
 206   // Takes ownership of |promise| and returns an identifier to be passed via
 207   // Pepper.
 208   uint32_t SavePromise(scoped_ptr<media::CdmPromise> promise);
 209
 210   // Find the promise for a specified |promise_id|. Caller is responsible to
 211   // delete the CdmPromise<> once done with it.
 212   scoped_ptr<media::CdmPromise> TakePromise(uint32_t promise_id);
 213
 214   const PP_Instance pp_instance_;
 215   const PPP_ContentDecryptor_Private* const plugin_decryption_interface_;
 216
 217   // TODO(ddorwin): Remove after updating the Pepper API to not use key system.
 218   std::string key_system_;
 219
 220   // Callbacks for firing session events.
 221   media::SessionMessageCB session_message_cb_;
 222   media::SessionReadyCB session_ready_cb_;
 223   media::SessionClosedCB session_closed_cb_;
 224   media::SessionErrorCB session_error_cb_;
 225   media::SessionKeysChangeCB session_keys_change_cb_;
 226   media::SessionExpirationUpdateCB session_expiration_update_cb_;
 227
 228   // Callback to notify that unexpected error happened and |this| should not
 229   // be used anymore.
 230   base::Closure fatal_plugin_error_cb_;
 231
 232   gfx::Size natural_size_;
 233
 234   // Request ID for tracking pending content decryption callbacks.
 235   // Note that zero indicates an invalid request ID.
 236   // TODO(xhwang): Add completion callbacks for Reset/Stop and remove the use
 237   // of request IDs.
 238   uint32_t next_decryption_request_id_;
 239
 240   TrackableCallback<media::Decryptor::DecryptCB> audio_decrypt_cb_;
 241   TrackableCallback<media::Decryptor::DecryptCB> video_decrypt_cb_;
 242   TrackableCallback<media::Decryptor::DecoderInitCB> audio_decoder_init_cb_;
 243   TrackableCallback<media::Decryptor::DecoderInitCB> video_decoder_init_cb_;
 244   TrackableCallback<media::Decryptor::AudioDecodeCB> audio_decode_cb_;
 245   TrackableCallback<media::Decryptor::VideoDecodeCB> video_decode_cb_;
 246
 247   // Cached audio and video input buffers. See MakeMediaBufferResource.
 248   scoped_refptr<PPB_Buffer_Impl> audio_input_resource_;
 249   scoped_refptr<PPB_Buffer_Impl> video_input_resource_;
 250
 251   std::queue<uint32_t> free_buffers_;
 252
 253   // Keep track of audio parameters.
 254   int audio_samples_per_second_;
 255   int audio_channel_count_;
 256   media::ChannelLayout audio_channel_layout_;
 257
 258   // Keep track of outstanding promises. Maps have ownership of the promises.
 259   uint32_t next_promise_id_;
 260   PromiseMap promises_;
 261
 262   base::WeakPtr<ContentDecryptorDelegate> weak_this_;
 263   base::WeakPtrFactory<ContentDecryptorDelegate> weak_ptr_factory_;
 264
 265   DISALLOW_COPY_AND_ASSIGN(ContentDecryptorDelegate);
 266 };
 267
 268 }  // namespace content
 269
 270 #endif  // CONTENT_RENDERER_PEPPER_CONTENT_DECRYPTOR_DELEGATE_H_