Sync layer functions

MPEG sync layer functions. More...

Functions
MP4Err	MP4NewSampleDescription (MP4Track theTrack, MP4Handle sampleDescriptionH, u32 dataReferenceIndex, u32 objectTypeIndication, u32 streamType, u32 decoderBufferSize, u32 maxBitrate, u32 avgBitrate, MP4Handle decoderSpecificInfoH)
	Create a basic sample description that can be used for calls to MP4AddMediaSamples().
MP4Err	MP4NewSampleDescriptionWithOCRAssociation (MP4Track theTrack, MP4Handle sampleDescriptionH, u32 dataReferenceIndex, u32 objectTypeIndication, u32 streamType, u32 decoderBufferSize, u32 maxBitrate, u32 avgBitrate, MP4Handle decoderSpecificInfoH, u32 theOCRESID)
	Create a sample description with clock reference.
MP4Err	MP4SetSampleDescriptionPriority (MP4Handle sampleEntryH, u32 priority)
	This function sets the MPEG-4 elementary stream priority of the associated stream (in the elementary stream descriptor).

Detailed Description

MPEG sync layer functions.

Function Documentation

MP4NewSampleDescription()

MP4Err MP4NewSampleDescription	(	MP4Track	theTrack,
		MP4Handle	sampleDescriptionH,
		u32	dataReferenceIndex,
		u32	objectTypeIndication,
		u32	streamType,
		u32	decoderBufferSize,
		u32	maxBitrate,
		u32	avgBitrate,
		MP4Handle	decoderSpecificInfoH
	)

Create a basic sample description that can be used for calls to MP4AddMediaSamples().

This will create the proper kind of sample entry atom for the track type, and a basic elementary stream descriptor that contains the information you provide in the parameters.

Parameters

sampleDescriptionH	The handle that will contain the new sample description.
dataReferenceIndex	The index of the data reference that describes the media samples. If you haven’t called MP4AddMediaDataReference() this parameter should be set to 1. Otherwise set it to the proper reference index for these samples.
objectTypeIndication	Set this properly according to the table in the Systems spec.
streamType	Set this properly according to the table in the Systems specification.
decoderBufferSize	Set this to the size (in bytes) needed for the decoder input buffer.
maxBitrate	Set this to the maximum number of bits per second needed to transmit media.
avgBitrate	Set this to the average bitrate for this media.
decoderSpecificInfoH	A handle that must contain the decoder specific info needed for a decoder for this media type. This must be a properly formed descriptor, including tag and length fields.

MP4NewSampleDescriptionWithOCRAssociation()

MP4Err MP4NewSampleDescriptionWithOCRAssociation	(	MP4Track	theTrack,
		MP4Handle	sampleDescriptionH,
		u32	dataReferenceIndex,
		u32	objectTypeIndication,
		u32	streamType,
		u32	decoderBufferSize,
		u32	maxBitrate,
		u32	avgBitrate,
		MP4Handle	decoderSpecificInfoH,
		u32	theOCRESID
	)

Create a sample description with clock reference.

This function is a version of MP4NewSampleDescription() that permits the caller to indicate an association of the sample description with a clock reference. Parameters are the same as MP4NewSampleDescription(), with the addition of:

Parameters

theOCRESID

Set this to the ESID of the clock reference stream. A value of zero is permitted, and indicates that the stream has no explicit OCR association.