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[[RoQ]] multimedia files store audio in a DPCM format. A chunk of RoQ DPCM data is laid out as (all multi-byte numbers are little-endian): bytes 8..n DPCM bytes

This is a set of DPCM codecs used in [[Sierra Audio]], [[VMD]], and [[RBT]] files. === Old DPCM ===

...coded using a custom format that this page takes the liberty of naming Xan DPCM. ...xan'. A program can either check for this or assume that the file uses Xan DPCM if it uses [[Origin Xan Codec|Xan]] video. In Crusader: No Regret's AVIs t

...ies often use the custom [[Interplay MVE]] format to transport multimedia. Audio can be stored in these files using [[PCM]] or this custom format. ...res a 256-element delta table for encoding and decoding. For each chunk of DPCM data in an Interplay MVE file, the first 2 bytes comprise an initial predic

* Microsoft Audio ID: 0x0020 * Sample: http://samples.mplayerhq.hu/A-codecs/format-0x20-laugh.mmf

This page describes audio format and codecs used in different games by Sierra. Multi-byte numbers are stored in little- Flags are used to determine audio format and compression:

The CIN files contains both video and audio data with custom compression methods. bytes 12-15 - audio frame frequency (always 22050)

...ome games from Interplay. The name is shortened "AUDCOMP" and it employs [[DPCM]] with variable-length coding for compressing 8-bit PCM. bytes 26-29 possibly the size of decompressed audio

...d video files employ 8x8 DCT blocks for image coding and the same [[DPCM]] audio coding. == Audio format ==

Smacker files contain Smacker Video and one of a few different custom audio codecs. ...largest unpacked audio data buffer in bytes; this is provided for up to 7 audio tracks.

...n technique used is a QMF filter together with [[Huffman]], [[PCM#Adaptive DPCM|ADPCM]] and [[Vector Quantization|vector quantization]]. ...B in the event that the data is inadvertently interpreted as uncompressed audio samples. The upper two bits are basically sign bit extension, as defined by

*Samples: http://samples.mplayerhq.hu/A-codecs/Nelly_Moser/ ...ngle-channel (mono) format optimized for low-[[bitrate]] transmission of [[audio]]. The format was developed by Nellymoser Inc.

...GB video with LZ-like compression and block correlation and [[DPCM]]-coded audio. ...tle-endian version field (should be always set to one) followed by 48-byte audio header and 4-byte video header (16-bit number of frames and 16-bit frames p

* Audio ID: 0x0002 ...ant's 1973 paper [https://archive.org/details/bstj52-7-1119] (Table VIII, 'DPCM' column, B=4).

...s for pulse code modulation. In the context of audio coding PCM encodes an audio waveform in the time domain as a series of amplitudes. PCM audio is coded using a combination of various parameters.

...he video was packaged in [[AVI]] files along with a custom [[Xan DPCM|DPCM audio codec]]. [[Category:Video Codecs]]

| bgcolor="lime" | {{FATE|75|idroq-video-dpcm}} | MD STUDIO audio

...68-byte header a number of blocks follows with each block grouping several audio and video frames. 4 bytes - total number of audio frames

...been observed in games using GDV. The audio format is 8- or 16-bit PCM or DPCM. bit 3 packed data (1 = DPCM, 0 = PCM)

Sound data. [[PCM#Differential_PCM|DPCM]]-encoded sound fragment. == Decoding Audio ==