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Restructure TrackEvent.populateFrom()

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This commit is contained in:
christosts 2023-10-20 11:13:11 +00:00
parent a06430a513
commit 71602767ca
2 changed files with 35 additions and 39 deletions
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2
RELEASENOTES.md
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@ -38,6 +38,8 @@
* Smooth Streaming Extension:
* RTSP Extension:
* Decoder Extensions (FFmpeg, VP9, AV1, MIDI, etc.):
* MIDI decoder: Ignore SysEx event messages
([#710](https://github.com/androidx/media/pull/710)).
* Leanback extension:
* Cast Extension:
* Test Utilities:

72
libraries/decoder_midi/src/main/java/androidx/media3/decoder/midi/TrackEvent.java
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@ -84,9 +84,40 @@ import androidx.media3.common.util.UnstableApi;
int firstByte = parsableTrackEventBytes.readUnsignedByte();
eventDecoderSizeBytes = 1;
if ((firstByte & 0xF0) != 0xF0) {
// Most significant nibble is not 0xF, this is a MIDI channel event.
if (firstByte == SYSEX_BEGIN_STATUS) {
// TODO(b/228838584): Handle this gracefully.
statusByte = firstByte;
int currentByte;
do { // Consume SysEx message.
currentByte = parsableTrackEventBytes.readUnsignedByte();
} while (currentByte != SYSEX_END_STATUS);
} else if (firstByte == META_EVENT_STATUS) { // This is a Meta event.
int metaEventMessageType = parsableTrackEventBytes.readUnsignedByte();
int eventLength = readVariableLengthInt(parsableTrackEventBytes);
statusByte = firstByte;
switch (metaEventMessageType) {
case META_TEMPO_CHANGE:
usPerQuarterNote = parsableTrackEventBytes.readUnsignedInt24();
if (usPerQuarterNote <= 0) {
throw ParserException.createForUnsupportedContainerFeature(
"Tempo event data value must be a non-zero positive value. Parsed value: "
+ usPerQuarterNote);
}
parsableTrackEventBytes.skipBytes(eventLength - /* tempoDataLength */ 3);
break;
case META_END_OF_TRACK:
parsableTrackEventBytes.setPosition(startingPosition);
reset();
return false;
default: // Ignore all other Meta events.
parsableTrackEventBytes.skipBytes(eventLength);
}
} else { // This is a MIDI channel event.
// Check for running status, an occurrence where the statusByte has been omitted from the
// bytes of this event. The standard expects us to assume that this command has the same
// statusByte as the last command.
@ -115,42 +146,6 @@ import androidx.media3.common.util.UnstableApi;
}
statusByte = firstByte;
} else if (firstByte == META_EVENT_STATUS) { // This is a Meta event.
int metaEventMessageType = parsableTrackEventBytes.readUnsignedByte();
int eventLength = readVariableLengthInt(parsableTrackEventBytes);
statusByte = firstByte;
switch (metaEventMessageType) {
case META_TEMPO_CHANGE:
usPerQuarterNote = parsableTrackEventBytes.readUnsignedInt24();
if (usPerQuarterNote <= 0) {
throw ParserException.createForUnsupportedContainerFeature(
"Tempo event data value must be a non-zero positive value. Parsed value: "
+ usPerQuarterNote);
}
parsableTrackEventBytes.skipBytes(eventLength - /* tempoDataLength */ 3);
break;
case META_END_OF_TRACK:
parsableTrackEventBytes.setPosition(startingPosition);
reset();
return false;
default: // Ignore all other Meta events.
parsableTrackEventBytes.skipBytes(eventLength);
}
} else if (firstByte == SYSEX_BEGIN_STATUS) {
// TODO(b/228838584): Handle this gracefully.
statusByte = firstByte;
int currentByte;
do { // Consume SysEx message.
currentByte = parsableTrackEventBytes.readUnsignedByte();
} while (currentByte != SYSEX_END_STATUS);
} else {
throw ParserException.createForUnsupportedContainerFeature(
"Unknown track event: " + firstByte);
}
eventFileSizeBytes = parsableTrackEventBytes.getPosition() - startingPosition;
@ -161,7 +156,6 @@ import androidx.media3.common.util.UnstableApi;
}
public boolean isMidiEvent() {
// TODO(b/228838584): Update with SysEx event check when implemented.
return statusByte != META_EVENT_STATUS && statusByte != SYSEX_BEGIN_STATUS;
}