Add support for MPEG4 codec to enable muxing video encoded with the mp4v-es codec. Use esdsBox method to generate esds box required for Mp4v box.
PiperOrigin-RevId: 651000744
Some external media files have CodecSpecificData greater than 128 bytes. Currently, that size
isn't fitting in one byte. Hence, added support to store large CodecSpecificDataSize, as per
ISO standard, by extending to more than one byte as required.
PiperOrigin-RevId: 650972472
Since the muxer supported only AAC audio codec, the esdsBox was unconditionally created within the audioSampleEntry. This CL refactors the box creation logic by moving it to the codecSpecificBox method. This is to make adding support for new audio codecs easier.
PiperOrigin-RevId: 650130935
Add the following NAL unit parsing utility functions that will be needed for the MV-HEVC support as proposed in Apple's HEVC stereo video interoperability profile:
- NAL unit header parsing to get the layer information needed for MV-HEVC support.
- VPS parsing, including vps_extension() needed for MV-HEVC support.
- SPS parsing modifications to support MV-HEVC.
PiperOrigin-RevId: 647329211
This is done by reserving some space for moov box at the start of the file and writing it there if it fits. If it doesn't fit, then it is written at the end of the file.
PiperOrigin-RevId: 643944698
Muxer never uses latest output position but always writes to
a specific location, so restoring its position does not add any
value.
PiperOrigin-RevId: 642996941
Add composition time offset parameter to TRUN box to
support muxing of videos containing B-frames by FragmentedMp4Muxer.
Update TRUN box version from 0 to 1 in order to manage signed
composition time offset.
PiperOrigin-RevId: 636426397
Add ctts box implementation to handle muxing B-frame videos.
Add method convertPresentationTimestampsToCompositionOffset to
provide sample offsets. Return empty ctts box in case of video
does not contain B-frame. Add ctts box to MoovStructure to handle
muxing the video containing B-frames.
PiperOrigin-RevId: 633537106
The keys and ilst boxes in the MP4 muxer were allocated
with a fixed size of 200 bytes. This was not enough to
store the keys and values of large metadata entries, which
could cause the muxer to throw an exception. This CL allocates
the correct size for the keys and ilst boxes based on the size of the metadata entries.
PiperOrigin-RevId: 630331680
Add ctts box implementation to handle muxing B-frame videos.
Add method convertPresentationTimestampsToCompositionOffset to
provide sample offsets. Return empty ctts box in case of video
does not contain B-frame. Add ctts box to MoovStructure to handle
muxing the video containing B-frames.
PiperOrigin-RevId: 628346257
Update the function convertPresentationTimestampsToDurationsVu
to return a list of duration in decoding order,used in the
creation of STTS boxes.
PiperOrigin-RevId: 627052898
Since the public class has already been split into `Mp4Muxer` and
`FragmentedMp4Muxer`, there is no need for having common interface
for internal implementation.
In the follow up CL `BasicMp4Writer` will be renamed to `Mp4Writer`
which is more appropriate and aligns with public class names.
PiperOrigin-RevId: 619486876
This CL aims to separate Fragmented MP4 related logic in a separate public class.
Earlier all the logic was in a single class `Mp4Muxer`.
PiperOrigin-RevId: 619206661
The immediate plan is to replace `Transformer Muxer interface`
with this one.
It was not straight forward to move/change `Transformer Muxer interface`
hence this intermediate step.
The follow up CL will also remove fragmented MP4 related code from
`Mp4Muxer` and move it into `FragmentedMp4Muxer implements Muxer`.
PiperOrigin-RevId: 618789265
Issue: androidx/media#725
Ideally the test to transmux a `ts` file (having 3 bytes NAL start code)
should go into `Mp4MuxerEndToEndTest`but `Mp4MuxerEndToEndTest` uses `MediaExtractor` and `MediaExtractor` is returning samples with `4 byte NAL start code` which will not exercise the newly added code path.
Hence the test is added in `TransformerWithInAppMuxerEndToEndTest` which
internally uses `media3 extractor` and feeds samples with `3 bytes NAL start code`
only.
PiperOrigin-RevId: 617985866
This refactoring is required to support 3 byte NAL start code, in which
the sample ByteBuffer might change after AnnexB to Avcc conversion.
This would required changes in the corresponding BufferInfo as well.
PiperOrigin-RevId: 617538338
The AV1 video stream does not contain NAL unit which is a concept
specific to H.264/H.265.
This was not caught before muxer does an in place replacement of
`NAL start code` with `NAL length`. In the absence of `NAL start code`
it was automatically a no-op.
PiperOrigin-RevId: 617193317
