Inside Macintosh: QuickTime Components /

Chapter 5 - Sequence Grabber Components / Sequence Grabber Components Reference

Sequence Grabber Component Functions

Working With Sound Channels

Sequence grabber components provide a number of functions that allow you to configure the grabber's sound channels. This section describes these configuration functions, which you can use only with sound channels. You can determine whether a channel has a sound representation by calling the SGGetChannelInfo function, described on page 5-58. If you want to configure a video channel, use the
functions described in "Working With Video Channels" beginning on page 5-73. If you want to configure general attributes of a channel, use the functions described in "Working With Channel Characteristics" beginning on page 5-55.

Use the SGSetSoundInputDriver function to specify a channel's sound
input device. You can determine a channel's sound input device by calling the SGGetSoundInputDriver function. If you change any attributes of the sound input device, you should notify the sequence grabber component by calling the SGSoundInputDriverChanged function. By default, the sequence grabber component uses the sound driver's best settings.

You can control the amount of sound data the sequence grabber works with at one
time by calling the SGSetSoundRecordChunkSize function. You can determine
this value by calling the SGGetSoundRecordChunkSize function.

You can control the rate at which the sound channel samples the input data by calling the SGSetSoundInputRate function. You can determine the sample rate by calling the SGGetSoundInputRate function.

You can control other sound input parameters by using the SGSetSoundInputParameters and SGGetSoundInputParameters functions.

---

Subtopics

SGSetSoundInputDriver

SGGetSoundInputDriver

SGSoundInputDriverChanged

SGSetSoundRecordChunkSize

SGGetSoundRecordChunkSize

SGSetSoundInputRate

SGGetSoundInputRate

SGSetSoundInputParameters

SGGetSoundInputParameters