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Understand the Transformer progress #3324

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Understand the Transformer progress #3324

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34 changes: 33 additions & 1 deletion ...composition/src/main/java/androidx/media3/demo/composition/CompositionPreviewViewModel.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,7 @@ import androidx.media3.transformer.ExportResult
import androidx.media3.transformer.InAppFragmentedMp4Muxer
import androidx.media3.transformer.InAppMp4Muxer
import androidx.media3.transformer.JsonUtil
import androidx.media3.transformer.ProgressHolder
import androidx.media3.transformer.Transformer
import com.google.common.base.Stopwatch
import com.google.common.base.Ticker
Expand All @@ -86,6 +87,8 @@ import kotlin.math.cos
import kotlin.math.roundToInt
import kotlin.math.sin
import kotlin.math.sqrt
import kotlinx.coroutines.Job
import kotlinx.coroutines.delay
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
Expand Down Expand Up @@ -114,6 +117,7 @@ class CompositionPreviewViewModel(application: Application) : AndroidViewModel(a
internal var frameConsumerEnabled: Boolean = false
internal var surfaceView: SurfaceView? = null
private var transformer: Transformer? = null
private var progressPollingJob: Job? = null
private var outputFile: File? = null
private var preparedComposition: Composition? = null
private var playerPrepared: Boolean = false
Expand Down Expand Up @@ -657,6 +661,7 @@ class CompositionPreviewViewModel(application: Application) : AndroidViewModel(a
.addListener(
object : Transformer.Listener {
override fun onCompleted(composition: Composition, exportResult: ExportResult) {
progressPollingJob?.cancel()
exportStopwatch.stop()
val elapsedTimeMs = exportStopwatch.elapsed(TimeUnit.MILLISECONDS)
val details =
Expand Down Expand Up @@ -695,6 +700,7 @@ class CompositionPreviewViewModel(application: Application) : AndroidViewModel(a
exportResult: ExportResult,
exportException: ExportException,
) {
progressPollingJob?.cancel()
exportStopwatch.stop()
_uiState.update {
it.copy(
Expand Down Expand Up @@ -731,10 +737,35 @@ class CompositionPreviewViewModel(application: Application) : AndroidViewModel(a
exportStopwatch.start()
transformer!!.start(composition, filePath)
Log.i(TAG, "Export started")
startProgressPolling()
}

private fun startProgressPolling() {
progressPollingJob?.cancel()
progressPollingJob =
viewModelScope.launch(Dispatchers.Main) {
val progressHolder = ProgressHolder()
while (true) {
val currentTransformer = transformer ?: break
val progressState = currentTransformer.getProgress(progressHolder)
when (progressState) {
Transformer.PROGRESS_STATE_AVAILABLE ->
Log.i(TAG, "Export progress: ${progressHolder.progress}%")
Transformer.PROGRESS_STATE_WAITING_FOR_AVAILABILITY ->
Log.d(TAG, "Export progress: waiting for availability")
Transformer.PROGRESS_STATE_UNAVAILABLE ->
Log.d(TAG, "Export progress: unavailable")
Transformer.PROGRESS_STATE_NOT_STARTED -> break
}
delay(PROGRESS_POLLING_INTERVAL_MS)
}
}
}

/** Cancels any ongoing export operation, and deletes output file contents. */
fun cancelExport() {
progressPollingJob?.cancel()
progressPollingJob = null
transformer?.cancel()
transformer = null
outputFile?.delete()
Expand Down Expand Up @@ -1017,7 +1048,8 @@ class CompositionPreviewViewModel(application: Application) : AndroidViewModel(a
// A 3-second moving average window (rather than 1s) is used to smooth out micro-stutters
// and provide a stable, readable real-time playback FPS value in the UI.
private const val FPS_TRACKING_DURATION_MS = 3000L
private const val DEFAULT_IMAGE_DURATION_US = 1_000_000L
private const val DEFAULT_IMAGE_DURATION_US = 4_000_000L
private const val PROGRESS_POLLING_INTERVAL_MS = 100L
val MEDIA_TYPES = arrayOf("video/*", "image/*", "audio/*")
val HDR_MODE_DESCRIPTIONS =
mapOf(
Expand Down