Using `Integer.MAX_VALUE` risks causing arithmetic overflow in the codec
implementation.
Issue: androidx/media#810
#minor-release
PiperOrigin-RevId: 585104621
When transmuxing, the `EncodedSampleExporter` maintains a queue of input
buffers that get filled with encoded data by the asset loader. The number of
buffers was limited to avoid using more and more memory if producer (asset
loader) gets far ahead of the consumer (exporter).
Previously this limit was fixed at 10 buffers, but increasing the number of
buffers can make some transmux operations much faster. Allow allocating between
a min and max number of buffers, and also set a target allocation size beyond
which new buffers can't be allocated. This allows audio formats which require
many small buffers to be processed more quickly, while preventing allocating
too much memory for hypothetical very high bitrate formats.
'Remove video' edits on local videos in particular get much faster, because
audio buffers are very short and there are lots of them. With a sample 10
minute video, a 'remove video' edit took 2 seconds (36 seconds before this
change). With a sample 1 minute removing video took 0.25 seconds after this
change (2.5 seconds before).
The speed improvement is smaller for other types of edits that retain the video
track. Transmuxing a 10 minute video retaining the video track took 26 seconds
(40 seconds before).
PiperOrigin-RevId: 583390284
For pause and resume feature we need to use same `MuxerWrapper`
for `remuxing processed video` and then to `process remaining video`.
In order to use same `MuxerWrapper` across `different Exports`
we need to preserve its state.
PiperOrigin-RevId: 564728396
Modifying dumping to not required "released" to be called.
Track index is an arbitrary value based on the order of addTrack calls.
Samples are dumped by track (rather than as soon as they are written),
so it's preferable to use a value that provides more context.
By using the track type as a key, dump files will be more deterministic
and will have more similarities when branched.
PiperOrigin-RevId: 563700982
Switch to SparseArray<List> rather than a Map<Integer, List>.
Track indices now determine sample list dumping, reducing flakiness.
PiperOrigin-RevId: 561658586
For pause and resume feature we need to find the timestamp of
the last sync sample in an MP4 file. The Mp4ExtractorWrapper
provides an easy to use API on top of Mp4Extractor.
PiperOrigin-RevId: 560113112
Covers all permutations&combinations of:
* AV asset.
* AV asset with effects.
* AV asset with silence.
* AV asset with silence and effects.
Note that the video is not relevant (therefore transmuxed), but is
needed for silence generation.
PiperOrigin-RevId: 558734593
Rename AudioMixerImpl to DefaultAudioMixer.
Removes the AudioMixerImpl specific getOutputAudioFormat, as the caller
defines and sets this.
PiperOrigin-RevId: 555887722
When generating silence for AudioProcessingPipeline, audio never
queued EOS downstream.
Linked to this, when silence followed an item with audio, the silence
was added to SilentAudioGenerator before the mediaItem reconfiguration
occurred. If the silence had effects, the APP would be flushed after
silence queued EOS, resetting APP.isEnded back to false, so AudioGraph
never ended.
Regression tests reproduce failure without fix, but pass with it.
PiperOrigin-RevId: 550853714
AudioMixingUtil#mix handles input & output in float or Int16 PCM. Given
Float and Int16 use different sample ratnes, this util handles
conversion between the two, based on the encoding being mixed to.
Migrate AudioMixer to use the util, removing AudioMixingAlgorithm
interface and implementation. ChannelMixingAudioProcessor will be
migrated after additional performance checks.
PiperOrigin-RevId: 548994584
