AVSAMPLEFMTDBLP

AVSAMPLEFMT_DBLP is a sample format identifier used in multimedia frameworks, most notably in the FFmpeg library and related tools, to specify the bit-depth and sample representation of audio data. It stands for "double planar," indicating that the audio samples are stored in double-precision floating-point format (64-bit) and arranged in a planar layout, where each channel is stored in a separate buffer rather than interleaved.

In FFmpeg and related software, sample formats are used to define how audio data is encoded in memory. AVSAMPLEFMT_DBLP is one of several predefined formats, including integer-based formats (e.g., AVSAMPLEFMT_S16P for 16-bit signed planar) and other floating-point formats like AVSAMPLEFMT_FLTP (single-precision planar). The "DBLP" format is particularly useful in applications requiring high precision, such as audio processing, synthesis, or effects where floating-point arithmetic is advantageous.

The planar layout of AVSAMPLEFMT_DBLP allows for efficient access to individual channels, which can be beneficial for parallel processing or when working with multi-channel audio. However, it also consumes more memory compared to interleaved formats, as each channel is stored separately. This format is commonly used in intermediate processing stages before converting to a more compact or lower-precision format for final output.

AVSAMPLEFMT_DBLP is not a standard audio encoding format for storage or playback but rather an internal representation used during processing. It is defined in FFmpeg’s header files and is part of its API for handling audio samples. Developers working with FFmpeg’s audio subsystem may encounter this format when configuring decoders, filters, or encoders that require high-precision sample handling.