info: improved USMT parsing

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/MetadataHandler.kt

@@ -184,12 +184,29 @@ class MetadataHandler(private val context: Context) : MethodCallHandler {
                                     metadataMap["Spherical Video"] = HashMap(GSpherical(bytes).describe())
                                     metadataMap.remove(dirName)
                                 }
-                                SonyVideoMetadata.USMT_UUID -> {
+                                QuickTimeMetadata.USMT_UUID -> {
                                     val bytes = dir.getByteArray(Mp4UuidBoxDirectory.TAG_USER_DATA)
-                                    val fields = SonyVideoMetadata.parseUsmt(bytes)
-                                    if (fields.isNotEmpty()) {
-                                        dirMap.remove("Data")
-                                        dirMap.putAll(fields)
+                                    val blocks = QuickTimeMetadata.parseUsmt(bytes)
+                                    if (blocks.isNotEmpty()) {
+                                        metadataMap.remove(dirName)
+                                        dirName = "QuickTime User Media"
+                                        val usmt = metadataMap[dirName] ?: HashMap()
+                                        metadataMap[dirName] = usmt
+
+                                        blocks.forEach {
+                                            var key = it.type
+                                            var value = it.value
+                                            val language = it.language
+
+                                            var i = 0
+                                            while (usmt.containsKey(key)) {
+                                                key = it.type + " (${++i})"
+                                            }
+                                            if (language != "und") {
+                                                value += " ($language)"
+                                            }
+                                            usmt[key] = value
+                                        }
                                     }
                                 }
                             }

android/app/src/main/kotlin/deckers/thibault/aves/metadata/Metadata.kt

@@ -24,7 +24,7 @@ object Metadata {
     val VIDEO_LOCATION_PATTERN: Pattern = Pattern.compile("([+-][.0-9]+)([+-][.0-9]+).*")
 
     private val VIDEO_DATE_SUBSECOND_PATTERN = Pattern.compile("(\\d{6})(\\.\\d+)")
-    private val VIDEO_TIMEZONE_PATTERN = Pattern.compile("(Z|[+-]\\d{4})$")
+    private val VIDEO_TIME_ZONE_PATTERN = Pattern.compile("(Z|[+-]\\d{4})$")
 
     // directory names, as shown when listing all metadata
     const val DIR_GPS = "GPS" // from metadata-extractor
@@ -71,7 +71,7 @@ object Metadata {
 
         // optional time zone
         var timeZone: TimeZone? = null
-        val timeZoneMatcher = VIDEO_TIMEZONE_PATTERN.matcher(dateString)
+        val timeZoneMatcher = VIDEO_TIME_ZONE_PATTERN.matcher(dateString)
         if (timeZoneMatcher.find()) {
             timeZone = TimeZone.getTimeZone("GMT${timeZoneMatcher.group().replace("Z", "")}")
             dateString = timeZoneMatcher.replaceAll("")

android/app/src/main/kotlin/deckers/thibault/aves/metadata/QuickTimeMetadata.kt

@@ -0,0 +1,92 @@
+package deckers.thibault.aves.metadata
+
+import java.math.BigInteger
+import java.nio.charset.Charset
+import java.util.*
+
+class QuickTimeMetadataBlock(val type: String, val value: String, val language: String)
+
+object QuickTimeMetadata {
+    // QuickTime Profile Tags
+    // cf https://exiftool.org/TagNames/QuickTime.html#Profile
+    // cf https://www.ffmpeg.org/doxygen/1.1/movenc_8c_source.html#l02839
+    const val PROF_UUID = "50524f46-21d2-4fce-bb88-695cfac9c740"
+
+    // QuickTime UserMedia Tags
+    // cf https://github.com/sonyxperiadev/MultimediaForAndroidLibrary/blob/master/library/src/main/java/com/sonymobile/android/media/internal/VUParser.java
+    // cf https://rubenlaguna.com/post/2007-02-25-how-to-read-title-in-sony-psp-mp4-files/
+    const val USMT_UUID = "55534d54-21d2-4fce-bb88-695cfac9c740"
+
+    private const val METADATA_BOX_ID = "MTDT"
+
+    fun parseUsmt(data: ByteArray): List<QuickTimeMetadataBlock> {
+        val blocks = ArrayList<QuickTimeMetadataBlock>()
+        val boxType = String(data.copyOfRange(4, 8))
+        if (boxType == METADATA_BOX_ID) {
+            blocks.addAll(parseQuicktimeMtdtBox(data))
+        }
+        return blocks
+    }
+
+    private fun parseQuicktimeMtdtBox(data: ByteArray): List<QuickTimeMetadataBlock> {
+        val blocks = ArrayList<QuickTimeMetadataBlock>()
+        var bytes = data
+        val boxDataSize = BigInteger(data.copyOfRange(0, 4)).toInt()
+        val blockCount = BigInteger(bytes.copyOfRange(8, 10)).toInt()
+        bytes = bytes.copyOfRange(10, boxDataSize)
+
+        for (i in 0 until blockCount) {
+            val blockSize = BigInteger(bytes.copyOfRange(0, 2)).toInt()
+            val blockType = BigInteger(bytes.copyOfRange(2, 6)).toInt()
+            val language = parseLanguage(bytes.copyOfRange(6, 8))
+            val encoding = BigInteger(bytes.copyOfRange(8, 10)).toInt()
+            val payload = bytes.copyOfRange(10, blockSize)
+
+            val payloadString = when (encoding) {
+                // 0x00: short array
+                0x00 -> {
+                    payload
+                        .asList()
+                        .chunked(2)
+                        .map { (h, l) -> ((h.toInt() shl 8) + l.toInt()).toShort() }
+                        .joinToString()
+                }
+                // 0x01: string
+                0x01 -> String(payload, Charset.forName("UTF-16BE")).trim()
+                // 0x101: artwork/icon
+                else -> "0x${payload.joinToString("") { "%02x".format(it) }}"
+            }
+
+            val blockTypeString = when (blockType) {
+                0x01 -> "Title"
+                0x03 -> "Creation Time"
+                0x04 -> "Software"
+                0x0A -> "Track property"
+                0x0B -> "Time zone"
+                0x0C -> "Modification Time"
+                else -> "0x${"%02x".format(blockType)}"
+            }
+
+            blocks.add(
+                QuickTimeMetadataBlock(
+                    type = blockTypeString,
+                    value = payloadString,
+                    language = language,
+                )
+            )
+            bytes = bytes.copyOfRange(blockSize, bytes.size)
+        }
+
+        return blocks
+    }
+
+    // ISO 639 language code written as 3 groups of 5 bits for each letter (ascii code - 0x60)
+    // e.g. 0x55c4 -> 10101 01110 00100 -> 21 14 4 -> "und"
+    private fun parseLanguage(bytes: ByteArray): String {
+        val i = BigInteger(bytes).toInt()
+        val c1 = Character.toChars((i shr 10 and 0x1F) + 0x60)[0]
+        val c2 = Character.toChars((i shr 5 and 0x1F) + 0x60)[0]
+        val c3 = Character.toChars((i and 0x1F) + 0x60)[0]
+        return "$c1$c2$c3"
+    }
+}

android/app/src/main/kotlin/deckers/thibault/aves/metadata/SonyVideoMetadata.kt

@@ -1,73 +0,0 @@
-package deckers.thibault.aves.metadata
-
-import java.math.BigInteger
-import java.nio.charset.Charset
-import java.util.*
-
-object SonyVideoMetadata {
-    const val PROF_UUID = "50524f46-21d2-4fce-bb88-695cfac9c740"
-    const val USMT_UUID = "55534d54-21d2-4fce-bb88-695cfac9c740"
-
-    fun parseUsmt(data: ByteArray): HashMap<String, String> {
-        val dirMap = HashMap<String, String>()
-        var bytes = data
-        var size = BigInteger(bytes.copyOfRange(0, 4)).toInt()
-        val box = String(bytes.copyOfRange(4, 8))
-        if (box == "MTDT") {
-            val blockCount = BigInteger(bytes.copyOfRange(8, 10)).toInt()
-            bytes = bytes.copyOfRange(10, size)
-            size -= 10
-
-            for (i in 0 until blockCount) {
-                // cf https://github.com/sonyxperiadev/MultimediaForAndroidLibrary
-                // cf https://rubenlaguna.com/post/2007-02-25-how-to-read-title-in-sony-psp-mp4-files/
-
-                val blockSize = BigInteger(bytes.copyOfRange(0, 2)).toInt()
-
-                val blockType = BigInteger(bytes.copyOfRange(2, 6)).toInt()
-
-                // ISO 639 language code written as 3 groups of 5 bits for each letter (ascii code - 0x60)
-                // e.g. 0x55c4 -> 10101 01110 00100 -> 21 14 4 -> "und"
-                val language = BigInteger(bytes.copyOfRange(6, 8)).toInt()
-                val c1 = Character.toChars((language shr 10 and 0x1F) + 0x60)[0]
-                val c2 = Character.toChars((language shr 5 and 0x1F) + 0x60)[0]
-                val c3 = Character.toChars((language and 0x1F) + 0x60)[0]
-                val languageString = "$c1$c2$c3"
-
-                val encoding = BigInteger(bytes.copyOfRange(8, 10)).toInt()
-
-                val payload = bytes.copyOfRange(10, blockSize)
-                val payloadString = when (encoding) {
-                    // 0x00: short array
-                    0x00 -> {
-                        payload
-                            .asList()
-                            .chunked(2)
-                            .map { (h, l) -> ((h.toInt() shl 8) + l.toInt()).toShort() }
-                            .joinToString()
-                    }
-                    // 0x01: string
-                    0x01 -> String(payload, Charset.forName("UTF-16BE")).trim()
-                    // 0x101: artwork/icon
-                    else -> "0x${payload.joinToString("") { "%02x".format(it) }}"
-                }
-
-                val blockTypeString = when (blockType) {
-                    0x01 -> "Title"
-                    0x03 -> "Timestamp"
-                    0x04 -> "Creator name"
-                    0x0A -> "End of track"
-                    else -> "0x${"%02x".format(blockType)}"
-                }
-
-                val prefix = if (blockCount > 1) "$i/" else ""
-                dirMap["${prefix}Data"] = payloadString
-                dirMap["${prefix}Language"] = languageString
-                dirMap["${prefix}Type"] = blockTypeString
-
-                bytes = bytes.copyOfRange(blockSize, bytes.size)
-            }
-        }
-        return dirMap
-    }
-}