Recording to a 3GP file

To record to a 3GP file, use the Natural Access ADI service in combination with MMFI functions. Complete the following steps to record to a 3GP file:

Step	Action	Use
1	Check the library version to ensure that it supports the 3GP format.	mmGetVersion
2	Create the 3GP file. When you create this file, specify the format descriptor, file information, maximum file size, maximum duration, and interleaving depth.	mmOpenFile in write mode
3	For each type of media stream, create the media stream structure, and specify the following information: A format of NMS packetized AMR settings Whether NMS native headers should be checked Codec level Whether a hint track should be created MPEG4 or H.264 DCI (optional) Whether a sync point table should be created during record	mmOpenStream
4	Record the NMS packetized or raw audio data into memory-resident buffers. You can record multiple streams at the same time.	adiRecordMMToMemory adiRecordMMAsync
5	Set the skew correction time if necessary. The skew correction time is handled automatically by the MMFI during the subsequent mmWriteStream operations.	mmSetSkewCorrection
6	Store the buffers as the application receives them in ADIEVN_RECORDING_DONE events. If the application is using partial buffer mode (adiRecordMMAsync), repeat the mmWriteStream call for each received event.	mmWriteStream
7	Close the 3GP file.	mmCloseFile

Single buffer record call flow

The call flow for a single buffer record is shown below:

MMFI Lib

App

ADI service

The call flow for a partial buffer record is shown below:

MMFI Lib

App

ADI service