media: Migrate GetDecryptConfigCB to repeating callback.

This is a repeated callback because it's called from a while loop:
* https://cs.chromium.org/chromium/src/media/formats/mp2t/es_parser_adts.cc?rcl=db95e8ed4d10f4770b37e265ca78c906e344c6ef&l=212
* https://cs.chromium.org/chromium/src/media/formats/mp2t/es_parser_h264.cc?rcl=db95e8ed4d10f4770b37e265ca78c906e344c6ef&l=361

This is part of the base::Callback migration.

Context: https://cs.chromium.org/chromium/src/docs/callback.md?rcl=9fcc3764aea8f97e9f6de4a9ee61d554e67edcda&l=40

TBR=danakj@chromium.org

Bug: 714018
Change-Id: Ifb0f1119c2ed834bdfa4328afce0931c7776a626
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080354
Commit-Queue: Jose Lopes <jabolopes@google.com>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746714}

media/formats/mp2t/es_parser.h

@@ -30,7 +30,7 @@ class MEDIA_EXPORT EsParser {
  public:
   using EmitBufferCB =
       base::RepeatingCallback<void(scoped_refptr<StreamParserBuffer>)>;
-  using GetDecryptConfigCB = base::Callback<const DecryptConfig*()>;
+  using GetDecryptConfigCB = base::RepeatingCallback<const DecryptConfig*()>;
 
   EsParser();
   virtual ~EsParser();

media/formats/mp2t/es_parser_adts.cc

@@ -130,12 +130,12 @@ EsParserAdts::EsParserAdts(const NewAudioConfigCB& new_audio_config_cb,
 #if BUILDFLAG(ENABLE_HLS_SAMPLE_AES)
 EsParserAdts::EsParserAdts(const NewAudioConfigCB& new_audio_config_cb,
                            EmitBufferCB emit_buffer_cb,
-                           const GetDecryptConfigCB& get_decrypt_config_cb,
+                           GetDecryptConfigCB get_decrypt_config_cb,
                            EncryptionScheme init_encryption_scheme,
                            bool sbr_in_mimetype)
     : new_audio_config_cb_(new_audio_config_cb),
       emit_buffer_cb_(std::move(emit_buffer_cb)),
-      get_decrypt_config_cb_(get_decrypt_config_cb),
+      get_decrypt_config_cb_(std::move(get_decrypt_config_cb)),
       init_encryption_scheme_(init_encryption_scheme),
       sbr_in_mimetype_(sbr_in_mimetype) {}
 #endif

media/formats/mp2t/es_parser_adts.h

@@ -39,7 +39,7 @@ class MEDIA_EXPORT EsParserAdts : public EsParser {
 #if BUILDFLAG(ENABLE_HLS_SAMPLE_AES)
   EsParserAdts(const NewAudioConfigCB& new_audio_config_cb,
                EmitBufferCB emit_buffer_cb,
-               const GetDecryptConfigCB& get_decrypt_config_cb,
+               GetDecryptConfigCB get_decrypt_config_cb,
                EncryptionScheme init_encryption_scheme,
                bool sbr_in_mimetype);
 #endif

media/formats/mp2t/mp2t_stream_parser.cc

@@ -440,13 +440,14 @@ std::unique_ptr<EsParser> Mp2tStreamParser::CreateEncryptedH264Parser(
       &Mp2tStreamParser::OnVideoConfigChanged, base::Unretained(this), pes_pid);
   auto on_emit_video_buffer = base::BindRepeating(
       &Mp2tStreamParser::OnEmitVideoBuffer, base::Unretained(this), pes_pid);
-  auto get_decrypt_config =
-      emit_clear_buffers ? EsParser::GetDecryptConfigCB()
-                         : base::Bind(&Mp2tStreamParser::GetDecryptConfig,
-                                      base::Unretained(this));
+  EsParserAdts::GetDecryptConfigCB get_decrypt_config;
+  if (!emit_clear_buffers) {
+    get_decrypt_config = base::BindRepeating(
+        &Mp2tStreamParser::GetDecryptConfig, base::Unretained(this));
+  }
   return std::make_unique<EsParserH264>(
       std::move(on_video_config_changed), on_emit_video_buffer,
-      initial_encryption_scheme_, get_decrypt_config);
+      initial_encryption_scheme_, std::move(get_decrypt_config));
 }
 
 std::unique_ptr<EsParser> Mp2tStreamParser::CreateEncryptedAacParser(
@@ -456,13 +457,15 @@ std::unique_ptr<EsParser> Mp2tStreamParser::CreateEncryptedAacParser(
       &Mp2tStreamParser::OnAudioConfigChanged, base::Unretained(this), pes_pid);
   auto on_emit_audio_buffer = base::BindRepeating(
       &Mp2tStreamParser::OnEmitAudioBuffer, base::Unretained(this), pes_pid);
-  auto get_decrypt_config =
-      emit_clear_buffers ? EsParser::GetDecryptConfigCB()
-                         : base::Bind(&Mp2tStreamParser::GetDecryptConfig,
-                                      base::Unretained(this));
+  EsParserAdts::GetDecryptConfigCB get_decrypt_config;
+  if (!emit_clear_buffers) {
+    get_decrypt_config = base::BindRepeating(
+        &Mp2tStreamParser::GetDecryptConfig, base::Unretained(this));
+  }
   return std::make_unique<EsParserAdts>(
       on_audio_config_changed, std::move(on_emit_audio_buffer),
-      get_decrypt_config, initial_encryption_scheme_, sbr_in_mimetype_);
+      std::move(get_decrypt_config), initial_encryption_scheme_,
+      sbr_in_mimetype_);
 }
 #endif