DirectShow Media Types (Compact 2013)

  • Article

3/26/2014

DirectShow uses the AM_MEDIA_TYPE structure to describe media samples.

This structure includes GUID fields for major type, subtype, and format type, in addition to fields specifying other properties of the sample, such as sample compression.

The major type and subtype options registered by DirectShow are described below. These media types are defined in the header file Uuids.h.

Media Types with No Subtype

The following table describes the media types that have no subtype.

Type

Description

MEDIATYPE_AnalogAudio

Analog audio connection.

MEDIATYPE_File

Media type is a file, used by closed captioning.

MEDIATYPE_Interleaved

Data is interleaved, used by Digital Video (DV).

MEDIATYPE_ScriptCommand

Data is a script command, used by closed captioning.

MEDIATYPE_Text

Data is text.

MEDIATYPE_Timecode

Data is timecode data.

Audio Media Types

The wFormatTag member in the WAVEFORMATEX structure specifies the audio format type.

The format type is generally FORMAT_WaveFormatEx. Media samples are generally a whole number of samples as specified in the wBitsPerSample member in the WAVEFORMATEX structure. This format does not always apply to MPEG audio samples that can come from packetized streams; therefore, those samples may not be packaged on sample/frame boundaries.

For MPEG audio, the timestamp in a media sample is the timestamp for the first frame whose first byte is contained in the media sample.

Media subtypes are defined for each wFormatTag as follows:

  • The Data1 subfield of the Media Subtype is the same as the wFormatTag value.
  • The Data 2 field is 0.
  • The Data 3 field is 0x0010.
  • The Data 4 field is 0x80, 0x00, 0x00, 0xAA, 0x00, 0x38, 0x9B, 0x71.

Thus, for pulse-code modulation (PCM) audio the subtype GUID would be:

{00000001-0000-0010-8000-00AA00389B71}

Older filters may still use GUID_NULL as the subtype, so you must update the subtype. However, registration of a filter with the explicit subtype greatly improves the speed of graph loading, especially when the given filter is not required.

You can use the CreateAudioMediaType function to create an AM_MEDIA_TYPE structure from a WAVEFORMATEX (Waveform Audio) structure.

The following table describes the audio media subtypes.

MEDIATYPE_Audio

Data is audio

MEDIASUBTYPE_PCMAudio

PCM audio

MEDIASUBTYPE_MPEG1Packet

MPEG-1 Audio Packet

MEDIASUBTYPE_MPEG1Payload

MPEG-1 Audio Payload

MEDIASUBTYPE_DOLBY_AC3

Dolby AC3 data

MEDIASUBTYPE_MPEG2_AUDIO

MPEG-2 audio data

MEDIASUBTYPE_DVD_LPCM_AUDIO

DVD audio data

MEDIASUBTYPE_MPEG_ADTS_AAC

AAC in an Audio Data Transport Stream (ADTS) for streaming.

Line 21 Media Types

The following table describes the line 21 closed captioning media subtypes.

MEDIATYPE_AUXLine21Data

Data is line 21 type, used by closed captioning

MEDIASUBTYPE_Line21_BytePair

Line 21 data as byte pairs

MEDIASUBTYPE_Line21_GOPPacket

Line 21 data in DVD group of pictures (GOP) packet

MEDIASUBTYPE_Line21_VBIRawData

Line 21 data in raw Vertical Blank Interleave (VBI) format

Stream Media Types

Timestamps are byte positions * 10000000 (notionally 1 byte per second) rather than real times.

The following table describes the stream media subtypes.

MEDIATYPE_Stream

Data is a non-timestamped byte stream

MEDIASUBTYPE_Avi

Data from AVI file

MEDIASUBTYPE_WAVE

Data from WAV file

MEDIASUBTYPE_AU

Data from AU file

MEDIASUBTYPE_AIFF

Data from AIFF file

MEDIASUBTYPE_PCM

Data from PCM files

MEDIASUBTYPE_MPEG1Video

MPEG video

MEDIASUBTYPE_MPEG1System

MPEG system

MEDIASUBTYPE_MPEG1VideoCD

MPEG video CD

MEDIASUBTYPE_MPEG1Audio

MPEG audio

MEDIASUBTYPE_DssVideo

Dss video

MEDIASUBTYPE_DssAudio

Dss audio

Video Media Types

The following table describes the video media subtypes.

MEDIATYPE_Video

Data is video

MEDIASUBTYPE_YVU9

Standard YVU9 format uncompressed data.

A planar YUV format.

A Y sample at every pixel, a U and V sample at every fourth pixel horizontally on each line; a Y sample on every vertical line, a U and V sample at every fourth vertical line.

9 bits per pixel.

MEDIASUBTYPE_Y411

YUV 411 format data.

Same as Y41P.

MEDIASUBTYPE_Y41P

Y41P format data. A packed YUV format.

A Y sample at every pixel, a U and V sample at every fourth pixel horizontally on each line; every vertical line sampled.

Byte ordering (lowest first) is U0, Y0, V0, Y1, U4, Y2, V4, Y3, Y4, Y5, Y6, Y7, where the suffix 0 is the leftmost pixel and increasing numbers are pixels increasing left to right.

Each 12-byte block is 8 image pixels.

MEDIASUBTYPE_YUY2

YUY2 format data. Same as UYVY but with different pixel ordering.

Byte ordering (lowest first) is Y0, U0, Y1, V0, Y2, U2, Y3, V2, Y4, U4, Y5, V4, where the suffix 0 is the leftmost pixel and increasing numbers are pixels increasing left to right.

Each 4-byte block is 2 image pixels.

MEDIASUBTYPE_YVYU

YVYU format data. A packed YUV format. Same as UYVY but with different pixel ordering.

Byte ordering (lowest first) is Y0, V0, Y1, U0, Y2, V2, Y3, U2, Y4, V4, Y5, U4, where the suffix 0 is the leftmost pixel and increasing numbers are pixels increasing left to right.

Each 4-byte block is 2 image pixels.

MEDIASUBTYPE_UYVY

UYVY format data. A packed YUV format. A Y sample at every pixel, a U and V sample at every second pixel horizontally on each line; every vertical line sampled. Most popular of the various YUV 4:2:2 formats. Byte ordering (lowest first) is U0, Y0, V0, Y1, U2, Y2, V2, Y3, U4, Y4, V4, Y5, where the suffix 0 is the leftmost pixel and increasing numbers are pixels increasing left to right. Each 4-byte block is 2 image pixels.

MEDIASUBTYPE_Y211

YUV 211 format data.

A packed YUV format.

A Y sample at every second pixel, a U and V sample at every fourth pixel horizontally on each line; every vertical line sampled.

Byte ordering (lowest first) is Y0, U0, Y2, V0, Y4, U4, Y6, V4, Y8, U8, Y10, V8, where the suffix 0 is the leftmost pixel and increasing numbers are pixels increasing left to right.

Each 4-byte block is 4 image pixels.

MEDIASUBTYPE_CLJR

Cirrus Logic Jr YUV 411 format with less than 8 bits per Y, U, and V sample.

A Y sample at every pixel, a U and V sample at every fourth pixel horizontally on each line; every vertical line sampled.

MEDIASUBTYPE_IF09

Indeo-produced YVU9 format with additional information about differences from the last frame. 9.5 bits per pixel but reported as 9.

MEDIASUBTYPE_MJPG

Motion JPEG (MJPG) compressed video.

MEDIASUBTYPE_TVMJ

TrueVision MJPG format.

MEDIASUBTYPE_WAKE

MJPG format produced by certain video cards.

MEDIASUBTYPE_CFCC

MJPG format produced by certain video cards.

MEDIASUBTYPE_IJPG

JPEG format.

MEDIASUBTYPE_Plum

Plum MJPG format.

MEDIASUBTYPE_RGB1

RGB 1 bit per pixel. Palettized.

MEDIASUBTYPE_RGB4

RGB 4 bits per pixel. Palettized.

MEDIASUBTYPE_RGB8

RGB 8 bits per pixel. Palettized.

MEDIASUBTYPE_RGB565

565 format of RGB, 16 bits per pixel. Uncompressed RGB samples.

MEDIASUBTYPE_RGB555

555 format of RGB, 16 bits per pixel. Uncompressed RGB samples.

MEDIASUBTYPE_RGB24

RGB 24 bits per pixel. Uncompressed RGB samples.

MEDIASUBTYPE_RGB32

RGB 32 bits per pixel. Uncompressed RGB samples.

MEDIASUBTYPE_Overlay

Video delivered by using hardware overlay.

MEDIASUBTYPE_dvsd

Standard DV format.

MEDIASUBTYPE_dvhd

High Definition DV format.

MEDIASUBTYPE_dvsl

Long Play DV format.

MEDIASUBTYPE_MPEG1Packet

MPEG1 Video Packet.

MEDIASUBTYPE_MPEG1Payload

MPEG1 Video Payload.

MEDIASUBTYPE_VideoPort

Data is video port data, used with DVD.

MEDIASUBTYPE_h264

H.264 bit stream with start codes.

MEDIASUBTYPE_MP4V

Input media type supported by the MPEG4 Part 2 Video.

See Also

Reference

DirectShow Reference