Support HLS MPEG2 TS with SAMPLE-AES encryption.

media/formats/mp2t/es_parser_adts.h

Index: media/formats/mp2t/es_parser_adts.h
diff --git a/media/formats/mp2t/es_parser_adts.h b/media/formats/mp2t/es_parser_adts.h
index bd7759d99104a7515684e4de8ea5e251f41178b9..ed68d8e61423f47c7403a0e074163ef5b06b1d77 100644
--- a/media/formats/mp2t/es_parser_adts.h
+++ b/media/formats/mp2t/es_parser_adts.h
@@ -16,8 +16,10 @@
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "media/base/audio_decoder_config.h"
+#include "media/base/decrypt_config.h"
 #include "media/base/media_export.h"
 #include "media/formats/mp2t/es_parser.h"
+#include "media/media_features.h"
 
 namespace media {
 class AudioTimestampHelper;
@@ -36,6 +38,14 @@ class MEDIA_EXPORT EsParserAdts : public EsParser {
   EsParserAdts(const NewAudioConfigCB& new_audio_config_cb,
                const EmitBufferCB& emit_buffer_cb,
                bool sbr_in_mimetype);
+#if BUILDFLAG(ENABLE_HLS_SAMPLE_AES)
+  EsParserAdts(const NewAudioConfigCB& new_audio_config_cb,
+               const EmitBufferCB& emit_buffer_cb,
+               bool sbr_in_mimetype,
+               bool use_hls_sample_aes,
+               const GetDecryptConfigCB& get_decrypt_config_cb);
+#endif
+
   ~EsParserAdts() override;
 
   // EsParser implementation.
@@ -63,11 +73,21 @@ class MEDIA_EXPORT EsParserAdts : public EsParser {
   // a supported ADTS audio config.
   bool UpdateAudioConfiguration(const uint8_t* adts_header);
 
+#if BUILDFLAG(ENABLE_HLS_SAMPLE_AES)
+  void CalculateSubsamplesForAdtsFrame(const AdtsFrame& adts_frame,
+                                       std::vector<SubsampleEntry>* subsamples);
+#endif
+
   // Callbacks:
   // - to signal a new audio configuration,
   // - to send ES buffers.
   NewAudioConfigCB new_audio_config_cb_;
   EmitBufferCB emit_buffer_cb_;
+#if BUILDFLAG(ENABLE_HLS_SAMPLE_AES)
+  bool use_hls_sample_aes_;
+  // - to obtain the current decrypt_config. Only called if use_hls_sample_aes_.
+  GetDecryptConfigCB get_decrypt_config_cb_;
+#endif
 
   // True when AAC SBR extension is signalled in the mimetype
   // (mp4a.40.5 in the codecs parameter).