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rawvideoparse

rawvideoparse

Properties

GValueArray * channel-positions Read / Write
GstRawAudioParseFormat format Read / Write
gboolean interleaved Read / Write
gint num-channels Read / Write
GstAudioFormat pcm-format Read / Write
gint sample-rate Read / Write

Types and Values

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GstObject
            ╰── GstElement
                ╰── GstBaseParse
                    ╰── GstRawBaseParse
                        ╰── GstRawAudioParse

Description

This element parses incoming data as raw video frames and timestamps these. It also handles seek queries in said raw video data, and ensures that output buffers contain exactly one frame, even if the input buffers contain only partial frames or multiple frames. In the former case, it will continue to receive buffers until there is enough input data to output one frame. In the latter case, it will extract the first frame in the buffer and output it, then the second one etc. until the remaining unparsed bytes aren't enough to form a complete frame, and it will then continue as described in the earlier case.

The element implements the properties and sink caps configuration as specified in the GstRawBaseParse documentation. The properties configuration can be modified by using the width, height, pixel-aspect-ratio, framerate, interlaced, top-field-first, plane-strides, plane-offsets, and frame-size properties.

If the properties configuration is used, plane strides and offsets will be computed by using gst_video_info_set_format(). This can be overridden by passing GstValueArrays to the plane-offsets and plane-strides properties. When this is done, these custom offsets and strides are used later even if new width, height, format etc. property values might be set. To switch back to computed plane strides & offsets, pass NULL to one or both of the plane-offset and plane-array properties.

The frame size property is useful in cases where there is extra data between the frames (for example, trailing metadata, or headers). The parser calculates the actual frame size out of the other properties and compares it with this frame-size value. If the frame size is larger than the calculated size, then the extra bytes after the end of the frame are skipped. For example, with 8-bit grayscale frames and a actual frame size of 100x10 pixels and a frame-size of 1500 bytes, there are 500 excess bytes at the end of the actual frame which are then skipped. It is safe to set the frame size to a value that is smaller than the actual frame size (in fact, its default value is 0); if it is smaller, then no trailing data will be skipped.

If a framerate of 0 Hz is set (for example, 0/1), then output buffers will have no duration set. The first output buffer will have a PTS 0, all subsequent ones an unset PTS.

Example pipelines

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gst-launch-1.0 filesrc location=video.raw ! rawvideoparse use-sink-caps=false \
        width=500 height=400 format=y444 ! autovideosink

Read raw data from a local file and parse it as video data with 500x400 pixels and Y444 video format.

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gst-launch-1.0 filesrc location=video.raw ! queue ! "video/x-raw, width=320, \
        height=240, format=I420, framerate=1/1" ! rawvideoparse \
        use-sink-caps=true ! autovideosink

Read raw data from a local file and parse it as video data with 320x240 pixels and I420 video format. The queue element here is to force push based scheduling. See the documentation in GstRawBaseParse for the reason why.

Synopsis

Element Information

plugin

rawparse

author

Carlos Rafael Giani <dv@pseudoterminal.org>

class

Codec/Parser/Video

Element Pads

name

sink

direction

sink

presence

always

details

video/x-unaligned-raw, format=(string){ I420, YV12, YUY2, UYVY, AYUV, RGBx, BGRx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, Y41B, Y42B, YVYU, Y444, v210, v216, NV12, NV21, GRAY8, GRAY16_BE, GRAY16_LE, v308, RGB16, BGR16, RGB15, BGR15, UYVP, A420, RGB8P, YUV9, YVU9, IYU1, ARGB64, AYUV64, r210, I420_10BE, I420_10LE, I422_10BE, I422_10LE, Y444_10BE, Y444_10LE, GBR, GBR_10BE, GBR_10LE, NV16, NV24, NV12_64Z32, A420_10BE, A420_10LE, A422_10BE, A422_10LE, A444_10BE, A444_10LE, NV61, P010_10BE, P010_10LE, IYU2, VYUY, GBRA, GBRA_10BE, GBRA_10LE, GBR_12BE, GBR_12LE, GBRA_12BE, GBRA_12LE, I420_12BE, I420_12LE, I422_12BE, I422_12LE, Y444_12BE, Y444_12LE }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

video/x-raw, format=(string){ I420, YV12, YUY2, UYVY, AYUV, RGBx, BGRx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, Y41B, Y42B, YVYU, Y444, v210, v216, NV12, NV21, GRAY8, GRAY16_BE, GRAY16_LE, v308, RGB16, BGR16, RGB15, BGR15, UYVP, A420, RGB8P, YUV9, YVU9, IYU1, ARGB64, AYUV64, r210, I420_10BE, I420_10LE, I422_10BE, I422_10LE, Y444_10BE, Y444_10LE, GBR, GBR_10BE, GBR_10LE, NV16, NV24, NV12_64Z32, A420_10BE, A420_10LE, A422_10BE, A422_10LE, A444_10BE, A444_10LE, NV61, P010_10BE, P010_10LE, IYU2, VYUY, GBRA, GBRA_10BE, GBRA_10LE, GBR_12BE, GBR_12LE, GBRA_12BE, GBRA_12LE, I420_12BE, I420_12LE, I422_12BE, I422_12LE, Y444_12BE, Y444_12LE }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

name

src

direction

source

presence

always

details

video/x-raw, format=(string){ I420, YV12, YUY2, UYVY, AYUV, RGBx, BGRx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, Y41B, Y42B, YVYU, Y444, v210, v216, NV12, NV21, GRAY8, GRAY16_BE, GRAY16_LE, v308, RGB16, BGR16, RGB15, BGR15, UYVP, A420, RGB8P, YUV9, YVU9, IYU1, ARGB64, AYUV64, r210, I420_10BE, I420_10LE, I422_10BE, I422_10LE, Y444_10BE, Y444_10LE, GBR, GBR_10BE, GBR_10LE, NV16, NV24, NV12_64Z32, A420_10BE, A420_10LE, A422_10BE, A422_10LE, A444_10BE, A444_10LE, NV61, P010_10BE, P010_10LE, IYU2, VYUY, GBRA, GBRA_10BE, GBRA_10LE, GBR_12BE, GBR_12LE, GBRA_12BE, GBRA_12LE, I420_12BE, I420_12LE, I422_12BE, I422_12LE, Y444_12BE, Y444_12LE }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

Functions

Types and Values

struct GstRawAudioParse

struct GstRawAudioParse;

Property Details

The “channel-positions” property

  “channel-positions”        GValueArray *

Channel positions used on the output.

Flags: Read / Write


The “format” property

  “format”                   GstRawAudioParseFormat

Format of the raw audio stream.

Flags: Read / Write

Default value: PCM


The “interleaved” property

  “interleaved”              gboolean

True if audio has interleaved layout.

Flags: Read / Write

Default value: TRUE


The “num-channels” property

  “num-channels”             gint

Number of channels in raw stream.

Flags: Read / Write

Allowed values: >= 1

Default value: 2


The “pcm-format” property

  “pcm-format”               GstAudioFormat

Format of audio samples in PCM stream (ignored if format property is not set to pcm).

Flags: Read / Write

Default value: GST_AUDIO_FORMAT_UNKNOWN


The “sample-rate” property

  “sample-rate”              gint

Rate of audio samples in raw stream.

Flags: Read / Write

Allowed values: >= 1

Default value: 44100

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