From: Steve Lhomme <slhomme@matroska.org>
Date: Sun, 11 Sep 2022 12:47:11 +0000 (+0200)
Subject: KaxSemantic: add KaxEmphasis audio element
X-Git-Tag: release-1.7.0~19
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4d74d61f54b49777855c64a7371e5d269fc2ea76;p=libmatroska

KaxSemantic: add KaxEmphasis audio element

Add in https://github.com/ietf-wg-cellar/matroska-specification/pull/659
---

diff --git a/matroska/KaxSemantic.h b/matroska/KaxSemantic.h
index b1e1264..9d24fc9 100644
--- a/matroska/KaxSemantic.h
+++ b/matroska/KaxSemantic.h
@@ -539,6 +539,9 @@ public:
 DECLARE_MKX_UINTEGER(KaxAudioBitDepth)
 };
 
+DECLARE_MKX_UINTEGER(KaxEmphasis)
+};
+
 DECLARE_MKX_MASTER(KaxTrackOperation)
 };
 
@@ -1093,6 +1096,25 @@ typedef enum {
   MATROSKA_VIDEO_PROJECTIONTYPE_MESH             = 3,
 } MatroskaVideoProjectionType;
 
+/**
+ *Audio emphasis applied on audio samples. The player **MUST** apply the inverse emphasis to get the proper audio samples.
+ */
+typedef enum {
+  MATROSKA_EMPHASIS_NO_EMPHASIS      = 0,
+  MATROSKA_EMPHASIS_CD_AUDIO         = 1, // First order filter with zero point at 50 microseconds and a pole at 15 microseconds. Also found on DVD Audio and MPEG audio.
+  MATROSKA_EMPHASIS_RESERVED         = 2,
+  MATROSKA_EMPHASIS_CCIT_J_17        = 3, // Defined in [@!ITU-J.17].
+  MATROSKA_EMPHASIS_FM_50            = 4, // FM Radio in Europe. RC Filter with a time constant of 50 microseconds.
+  MATROSKA_EMPHASIS_FM_75            = 5, // FM Radio in the USA. RC Filter with a time constant of 75 microseconds.
+  MATROSKA_EMPHASIS_PHONO_RIAA       = 10, // Phono filter with time constants of t1=3180, t2=318 and t3=75 microseconds. [@!NAB1964]
+  MATROSKA_EMPHASIS_PHONO_IEC_N78    = 11, // Phono filter with time constants of t1=3180, t2=450 and t3=50 microseconds.
+  MATROSKA_EMPHASIS_PHONO_TELDEC     = 12, // Phono filter with time constants of t1=3180, t2=318 and t3=50 microseconds.
+  MATROSKA_EMPHASIS_PHONO_EMI        = 13, // Phono filter with time constants of t1=2500, t2=500 and t3=70 microseconds.
+  MATROSKA_EMPHASIS_PHONO_COLUMBIA_LP = 14, // Phono filter with time constants of t1=1590, t2=318 and t3=100 microseconds.
+  MATROSKA_EMPHASIS_PHONO_LONDON     = 15, // Phono filter with time constants of t1=1590, t2=318 and t3=50 microseconds.
+  MATROSKA_EMPHASIS_PHONO_NARTB      = 16, // Phono filter with time constants of t1=3180, t2=318 and t3=100 microseconds.
+} MatroskaAudioEmphasis;
+
 /**
  *The kind of plane this track corresponds to.
  */
diff --git a/src/KaxSemantic.cpp b/src/KaxSemantic.cpp
index 1fef714..143f9be 100644
--- a/src/KaxSemantic.cpp
+++ b/src/KaxSemantic.cpp
@@ -439,6 +439,7 @@ DEFINE_SEMANTIC_ITEM(false, true, KaxAudioOutputSamplingFreq)
 DEFINE_SEMANTIC_ITEM(true, true, KaxAudioChannels)
 DEFINE_SEMANTIC_ITEM(false, true, KaxAudioPosition) // not supported
 DEFINE_SEMANTIC_ITEM(false, true, KaxAudioBitDepth)
+DEFINE_SEMANTIC_ITEM(true, true, KaxEmphasis)
 DEFINE_END_SEMANTIC(KaxTrackAudio)
 
 DEFINE_MKX_MASTER(KaxTrackAudio, 0xE1, 1, KaxTrackEntry, "TrackAudio")
@@ -447,6 +448,7 @@ DEFINE_MKX_FLOAT(KaxAudioOutputSamplingFreq, 0x78B5, 2, KaxTrackAudio, "AudioOut
 DEFINE_MKX_UINTEGER_DEF(KaxAudioChannels, 0x9F, 1, KaxTrackAudio, "AudioChannels", 1)
 DEFINE_MKX_BINARY (KaxAudioPosition, 0x7D7B, 2, KaxTrackAudio, "AudioPosition")
 DEFINE_MKX_UINTEGER(KaxAudioBitDepth, 0x6264, 2, KaxTrackAudio, "AudioBitDepth")
+DEFINE_MKX_UINTEGER_DEF(KaxEmphasis, 0x92F1, 2, KaxTrackAudio, "Emphasis", 0)
 
 DEFINE_START_SEMANTIC(KaxTrackOperation)
 DEFINE_SEMANTIC_ITEM(false, true, KaxTrackCombinePlanes)