AVSAMPLEFMTS32

AVSAMPLEFMTS32 is a term used to refer to the collection of 32-bit per-sample audio formats within the AVSampleFormat system used by FFmpeg and related multimedia libraries. In practice, it usually encompasses the 32-bit signed integer formats such as AV_SAMPLE_FMT_S32 for interleaved data and AV_SAMPLE_FMT_S32P for planar data. This grouping is used when describing or selecting PCM audio data at a 32-bit depth.

The primary purpose of AVSAMPLEFMTS32 is to support format negotiation and data processing in tasks such as decoding, encoding, resampling, and audio filter applications. When a software component negotiates a output or input format, it may consider whether a given sample format belongs to the 32-bit family to ensure compatibility with buffers, kernels, or downstream codecs. The distinction between interleaved (single data stream) and planar (separate channels) within these formats affects memory layout, vectorized processing, and performance characteristics.

Key characteristics of AVSAMPLEFMTS32 formats include a fixed 4 bytes per sample and, for planar variants, separate planes for each channel. Endianness and packing rules follow the conventions defined by the underlying AVSampleFormat enums in the library. While 32-bit depth provides a wide dynamic range, AVSAMPLEFMTS32 does not include other 32-bit representations such as 32-bit floating point, which are part of separate format groups.

Related concepts include AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT, and their planar counterparts, as well as utilities such as av_get_bytes_per_sample and functions that inspect or convert between sample formats.