abuffer


Buffer audio frames, and make them available to the filter chain.

This source is mainly intended for a programmatic use, in particular through the interface defined in 'libavfilter/asrc_abuffer.h'.

It accepts the following parameters:

'time_base'

The timebase which will be used for timestamps of submitted frames. It must be either a floating-point number or in numerator/denominator form.

'sample_rate'

The sample rate of the incoming audio buffers.

'sample_fmt'

The sample format of the incoming audio buffers. Either a sample format name or its corresponding integer representation from the enum AVSampleFormat in 'libavutil/samplefmt.h'

'channel_layout'

The channel layout of the incoming audio buffers. Either a channel layout name from channel_layout_map in 'libavutil/channel_layout.c' or its corresponding integer representation from the AV_CH_LAYOUT_* macros in 'libavutil/channel_layout.h'

'channels'

The number of channels of the incoming audio buffers. If both channels and channel_layout are specified, then they must be consistent.

abuffer=sample_rate=44100:sample_fmt=s16p:channel_layout=stereo

will instruct the source to accept planar 16bit signed stereo at 44100Hz. Since the sample format with name "s16p" corresponds to the number 6 and the "stereo" channel layout corresponds to the value 0x3, this is equivalent to: 

abuffer=sample_rate=44100:sample_fmt=6:channel_layout=0x3