Support HLS MPEG2 TS with SAMPLE-AES encryption.

media/formats/mp2t/mp2t_stream_parser.h

 // Copyright 2014 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.
 
 #ifndef MEDIA_FORMATS_MP2T_MP2T_STREAM_PARSER_H_
 #define MEDIA_FORMATS_MP2T_MP2T_STREAM_PARSER_H_
 
 #include <list>
 #include <map>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/audio_decoder_config.h"
 #include "media/base/byte_queue.h"
 #include "media/base/media_export.h"
 #include "media/base/stream_parser.h"
 #include "media/base/video_decoder_config.h"
 #include "media/formats/mp2t/timestamp_unroller.h"
 
 namespace media {
 
+class DecryptConfig;
 class StreamParserBuffer;
 
 namespace mp2t {
 
+class Descriptors;
 class PidState;
 
 class MEDIA_EXPORT Mp2tStreamParser : public StreamParser {
  public:
   explicit Mp2tStreamParser(bool sbr_in_mimetype);
   ~Mp2tStreamParser() override;
 
   // StreamParser implementation.
   void Init(const InitCB& init_cb,
             const NewConfigCB& config_cb,
             const NewBuffersCB& new_buffers_cb,
             bool ignore_text_tracks,
             const EncryptedMediaInitDataCB& encrypted_media_init_data_cb,
             const NewMediaSegmentCB& new_segment_cb,
             const base::Closure& end_of_segment_cb,
             const scoped_refptr<MediaLog>& media_log) override;
   void Flush() override;
   bool Parse(const uint8* buf, int size) override;
 
  private:
   typedef std::map<int, PidState*> PidMap;
+  typedef std::pair<int, PidState*> PidMapElement;
 
   struct BufferQueueWithConfig {
     BufferQueueWithConfig(bool is_cfg_sent,
                           const AudioDecoderConfig& audio_cfg,
                           const VideoDecoderConfig& video_cfg);
     ~BufferQueueWithConfig();
 
     bool is_config_sent;
     AudioDecoderConfig audio_config;
     StreamParser::BufferQueue audio_queue;
     VideoDecoderConfig video_config;
     StreamParser::BufferQueue video_queue;
   };
 
   // Callback invoked to register a Program Map Table.
   // Note: Does nothing if the PID is already registered.
   void RegisterPmt(int program_number, int pmt_pid);
 
   // Callback invoked to register a PES pid.
   // Possible values for |stream_type| are defined in:
   // ISO-13818.1 / ITU H.222 Table 2.34 "Stream type assignments".
   // |pes_pid| is part of the Program Map Table refered by |pmt_pid|.
-  void RegisterPes(int pmt_pid, int pes_pid, int stream_type);
+  // Some stream types are qualified by additional |descriptors|.
+  void RegisterPes(int pmt_pid,
+                   int pes_pid,
+                   int stream_type,
+                   const Descriptors& descriptors);
 
   // Since the StreamParser interface allows only one audio & video streams,
   // an automatic PID filtering should be applied to select the audio & video
   // streams.
   void UpdatePidFilter();
 
   // Callback invoked each time the audio/video decoder configuration is
   // changed.
   void OnVideoConfigChanged(int pes_pid,
                             const VideoDecoderConfig& video_decoder_config);
   void OnAudioConfigChanged(int pes_pid,
                             const AudioDecoderConfig& audio_decoder_config);
 
   // Invoke the initialization callback if needed.
   bool FinishInitializationIfNeeded();
 
   // Callback invoked by the ES stream parser
   // to emit a new audio/video access unit.
   void OnEmitAudioBuffer(
       int pes_pid,
       scoped_refptr<StreamParserBuffer> stream_parser_buffer);
   void OnEmitVideoBuffer(
       int pes_pid,
       scoped_refptr<StreamParserBuffer> stream_parser_buffer);
   bool EmitRemainingBuffers();
 
+#ifdef ENABLE_HLS_SAMPLE_AES
+  // Register the parser for CA Table.
+  PidMap::iterator RegisterCat();
+  void UnregisterCat();
+
+  // Register the PIDs for the Cenc packets (CENC-ECM and CENC-PSSH).
+  void RegisterCencPids(int ca_pid, int pssh_pid);
+  void UnregisterCencPids();
+
+  // Register the DecryptConfig (parsed from CENC-ECM).
+  void RegisterDecryptConfig(const DecryptConfig& config);
+
+  // Register the PSSH (parsed from CENC-PSSH).
+  void RegisterPsshBoxes(const std::vector<uint8> init_data);
+
+  const DecryptConfig& GetDecryptConfig() { return *decrypt_config_.get(); }
+#endif
+
   // List of callbacks.
   InitCB init_cb_;
   NewConfigCB config_cb_;
   NewBuffersCB new_buffers_cb_;
   EncryptedMediaInitDataCB encrypted_media_init_data_cb_;
   NewMediaSegmentCB new_segment_cb_;
   base::Closure end_of_segment_cb_;
   scoped_refptr<MediaLog> media_log_;
 
   // True when AAC SBR extension is signalled in the mimetype
@@ skipping 17 matching lines @@
   bool is_initialized_;
 
   // Indicate whether a segment was started.
   bool segment_started_;
 
   // Timestamp unroller.
   // Timestamps in PES packets must be unrolled using the same offset.
   // So the unroller is global between PES pids.
   TimestampUnroller timestamp_unroller_;
 
+#ifdef ENABLE_HLS_SAMPLE_AES
+  scoped_ptr<DecryptConfig> decrypt_config_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(Mp2tStreamParser);
 };
 
 }  // namespace mp2t
 }  // namespace media
 
 #endif